// Copyright 2015 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/compiler/wasm-compiler.h"
#include <memory>
#include "src/assembler-inl.h"
#include "src/assembler.h"
#include "src/base/optional.h"
#include "src/base/platform/elapsed-timer.h"
#include "src/base/platform/platform.h"
#include "src/base/v8-fallthrough.h"
#include "src/builtins/builtins.h"
#include "src/code-factory.h"
#include "src/compiler.h"
#include "src/compiler/access-builder.h"
#include "src/compiler/code-generator.h"
#include "src/compiler/common-operator.h"
#include "src/compiler/compiler-source-position-table.h"
#include "src/compiler/diamond.h"
#include "src/compiler/graph-visualizer.h"
#include "src/compiler/graph.h"
#include "src/compiler/instruction-selector.h"
#include "src/compiler/int64-lowering.h"
#include "src/compiler/js-graph.h"
#include "src/compiler/js-operator.h"
#include "src/compiler/linkage.h"
#include "src/compiler/machine-operator.h"
#include "src/compiler/node-matchers.h"
#include "src/compiler/node-origin-table.h"
#include "src/compiler/pipeline.h"
#include "src/compiler/simd-scalar-lowering.h"
#include "src/compiler/zone-stats.h"
#include "src/heap/factory.h"
#include "src/isolate-inl.h"
#include "src/log-inl.h"
#include "src/optimized-compilation-info.h"
#include "src/tracing/trace-event.h"
#include "src/trap-handler/trap-handler.h"
#include "src/wasm/function-body-decoder.h"
#include "src/wasm/function-compiler.h"
#include "src/wasm/jump-table-assembler.h"
#include "src/wasm/memory-tracing.h"
#include "src/wasm/wasm-code-manager.h"
#include "src/wasm/wasm-limits.h"
#include "src/wasm/wasm-linkage.h"
#include "src/wasm/wasm-module.h"
#include "src/wasm/wasm-objects-inl.h"
#include "src/wasm/wasm-opcodes.h"
#include "src/wasm/wasm-text.h"
namespace v8 {
namespace internal {
namespace compiler {
// TODO(titzer): pull WASM_64 up to a common header.
#if !V8_TARGET_ARCH_32_BIT || V8_TARGET_ARCH_X64
#define WASM_64 1
#else
#define WASM_64 0
#endif
#define FATAL_UNSUPPORTED_OPCODE(opcode) \
FATAL("Unsupported opcode 0x%x:%s", (opcode), \
wasm::WasmOpcodes::OpcodeName(opcode));
#define WASM_INSTANCE_OBJECT_OFFSET(name) \
(WasmInstanceObject::k##name##Offset - kHeapObjectTag)
#define LOAD_INSTANCE_FIELD(name, type) \
SetEffect(graph()->NewNode( \
mcgraph()->machine()->Load(type), instance_node_.get(), \
mcgraph()->Int32Constant(WASM_INSTANCE_OBJECT_OFFSET(name)), Effect(), \
Control()))
#define LOAD_FIXED_ARRAY_SLOT(array_node, index) \
SetEffect(graph()->NewNode( \
mcgraph()->machine()->Load(MachineType::TaggedPointer()), array_node, \
mcgraph()->Int32Constant(FixedArrayOffsetMinusTag(index)), Effect(), \
Control()))
int FixedArrayOffsetMinusTag(uint32_t index) {
auto access = AccessBuilder::ForFixedArraySlot(index);
return access.offset - access.tag();
}
namespace {
constexpr uint32_t kBytesPerExceptionValuesArrayElement = 2;
void MergeControlToEnd(MachineGraph* mcgraph, Node* node) {
Graph* g = mcgraph->graph();
if (g->end()) {
NodeProperties::MergeControlToEnd(g, mcgraph->common(), node);
} else {
g->SetEnd(g->NewNode(mcgraph->common()->End(1), node));
}
}
bool ContainsSimd(wasm::FunctionSig* sig) {
for (auto type : sig->all()) {
if (type == wasm::kWasmS128) return true;
}
return false;
}
bool ContainsInt64(wasm::FunctionSig* sig) {
for (auto type : sig->all()) {
if (type == wasm::kWasmI64) return true;
}
return false;
}
} // namespace
WasmGraphBuilder::WasmGraphBuilder(
wasm::ModuleEnv* env, Zone* zone, MachineGraph* mcgraph,
wasm::FunctionSig* sig,
compiler::SourcePositionTable* source_position_table)
: zone_(zone),
mcgraph_(mcgraph),
env_(env),
cur_buffer_(def_buffer_),
cur_bufsize_(kDefaultBufferSize),
has_simd_(ContainsSimd(sig)),
untrusted_code_mitigations_(FLAG_untrusted_code_mitigations),
sig_(sig),
source_position_table_(source_position_table) {
DCHECK_IMPLIES(use_trap_handler(), trap_handler::IsTrapHandlerEnabled());
DCHECK_NOT_NULL(mcgraph_);
}
Node* WasmGraphBuilder::Error() { return mcgraph()->Dead(); }
Node* WasmGraphBuilder::Start(unsigned params) {
Node* start = graph()->NewNode(mcgraph()->common()->Start(params));
graph()->SetStart(start);
return start;
}
Node* WasmGraphBuilder::Param(unsigned index) {
return graph()->NewNode(mcgraph()->common()->Parameter(index),
graph()->start());
}
Node* WasmGraphBuilder::Loop(Node* entry) {
return graph()->NewNode(mcgraph()->common()->Loop(1), entry);
}
Node* WasmGraphBuilder::Terminate(Node* effect, Node* control) {
Node* terminate =
graph()->NewNode(mcgraph()->common()->Terminate(), effect, control);
MergeControlToEnd(mcgraph(), terminate);
return terminate;
}
bool WasmGraphBuilder::IsPhiWithMerge(Node* phi, Node* merge) {
return phi && IrOpcode::IsPhiOpcode(phi->opcode()) &&
NodeProperties::GetControlInput(phi) == merge;
}
bool WasmGraphBuilder::ThrowsException(Node* node, Node** if_success,
Node** if_exception) {
if (node->op()->HasProperty(compiler::Operator::kNoThrow)) {
return false;
}
*if_success = graph()->NewNode(mcgraph()->common()->IfSuccess(), node);
*if_exception =
graph()->NewNode(mcgraph()->common()->IfException(), node, node);
return true;
}
void WasmGraphBuilder::AppendToMerge(Node* merge, Node* from) {
DCHECK(IrOpcode::IsMergeOpcode(merge->opcode()));
merge->AppendInput(mcgraph()->zone(), from);
int new_size = merge->InputCount();
NodeProperties::ChangeOp(
merge, mcgraph()->common()->ResizeMergeOrPhi(merge->op(), new_size));
}
void WasmGraphBuilder::AppendToPhi(Node* phi, Node* from) {
DCHECK(IrOpcode::IsPhiOpcode(phi->opcode()));
int new_size = phi->InputCount();
phi->InsertInput(mcgraph()->zone(), phi->InputCount() - 1, from);
NodeProperties::ChangeOp(
phi, mcgraph()->common()->ResizeMergeOrPhi(phi->op(), new_size));
}
Node* WasmGraphBuilder::Merge(unsigned count, Node** controls) {
return graph()->NewNode(mcgraph()->common()->Merge(count), count, controls);
}
Node* WasmGraphBuilder::Phi(wasm::ValueType type, unsigned count, Node** vals,
Node* control) {
DCHECK(IrOpcode::IsMergeOpcode(control->opcode()));
Node** buf = Realloc(vals, count, count + 1);
buf[count] = control;
return graph()->NewNode(
mcgraph()->common()->Phi(wasm::ValueTypes::MachineRepresentationFor(type),
count),
count + 1, buf);
}
Node* WasmGraphBuilder::EffectPhi(unsigned count, Node** effects,
Node* control) {
DCHECK(IrOpcode::IsMergeOpcode(control->opcode()));
Node** buf = Realloc(effects, count, count + 1);
buf[count] = control;
return graph()->NewNode(mcgraph()->common()->EffectPhi(count), count + 1,
buf);
}
Node* WasmGraphBuilder::RefNull() {
return LOAD_INSTANCE_FIELD(NullValue, MachineType::TaggedPointer());
}
Node* WasmGraphBuilder::NoContextConstant() {
// TODO(titzer): avoiding a dependency on JSGraph here. Refactor.
return mcgraph()->IntPtrConstant(0);
}
Node* WasmGraphBuilder::Uint32Constant(uint32_t value) {
return mcgraph()->Uint32Constant(value);
}
Node* WasmGraphBuilder::Int32Constant(int32_t value) {
return mcgraph()->Int32Constant(value);
}
Node* WasmGraphBuilder::Int64Constant(int64_t value) {
return mcgraph()->Int64Constant(value);
}
Node* WasmGraphBuilder::IntPtrConstant(intptr_t value) {
return mcgraph()->IntPtrConstant(value);
}
void WasmGraphBuilder::StackCheck(wasm::WasmCodePosition position,
Node** effect, Node** control) {
DCHECK_NOT_NULL(env_); // Wrappers don't get stack checks.
if (FLAG_wasm_no_stack_checks || !env_->runtime_exception_support) {
return;
}
if (effect == nullptr) effect = effect_;
if (control == nullptr) control = control_;
// This instruction sequence is matched in the instruction selector to
// load the stack pointer directly on some platforms. Hence, when modifying
// please also fix WasmStackCheckMatcher in node-matchers.h
Node* limit_address = graph()->NewNode(
mcgraph()->machine()->Load(MachineType::Pointer()), instance_node_.get(),
mcgraph()->Int32Constant(WASM_INSTANCE_OBJECT_OFFSET(StackLimitAddress)),
*effect, *control);
Node* limit = graph()->NewNode(
mcgraph()->machine()->Load(MachineType::Pointer()), limit_address,
mcgraph()->IntPtrConstant(0), limit_address, *control);
*effect = limit;
Node* pointer = graph()->NewNode(mcgraph()->machine()->LoadStackPointer());
Node* check =
graph()->NewNode(mcgraph()->machine()->UintLessThan(), limit, pointer);
Diamond stack_check(graph(), mcgraph()->common(), check, BranchHint::kTrue);
stack_check.Chain(*control);
if (stack_check_call_operator_ == nullptr) {
// Build and cache the stack check call operator and the constant
// representing the stack check code.
auto call_descriptor = Linkage::GetStubCallDescriptor(
mcgraph()->zone(), // zone
NoContextDescriptor{}, // descriptor
0, // stack parameter count
CallDescriptor::kNoFlags, // flags
Operator::kNoProperties, // properties
StubCallMode::kCallWasmRuntimeStub); // stub call mode
// A direct call to a wasm runtime stub defined in this module.
// Just encode the stub index. This will be patched at relocation.
stack_check_code_node_.set(mcgraph()->RelocatableIntPtrConstant(
wasm::WasmCode::kWasmStackGuard, RelocInfo::WASM_STUB_CALL));
stack_check_call_operator_ = mcgraph()->common()->Call(call_descriptor);
}
Node* call = graph()->NewNode(stack_check_call_operator_.get(),
stack_check_code_node_.get(), *effect,
stack_check.if_false);
SetSourcePosition(call, position);
Node* ephi = stack_check.EffectPhi(*effect, call);
*control = stack_check.merge;
*effect = ephi;
}
void WasmGraphBuilder::PatchInStackCheckIfNeeded() {
if (!needs_stack_check_) return;
Node* start = graph()->start();
// Place a stack check which uses a dummy node as control and effect.
Node* dummy = graph()->NewNode(mcgraph()->common()->Dead());
Node* control = dummy;
Node* effect = dummy;
// The function-prologue stack check is associated with position 0, which
// is never a position of any instruction in the function.
StackCheck(0, &effect, &control);
// In testing, no steck checks were emitted. Nothing to rewire then.
if (effect == dummy) return;
// Now patch all control uses of {start} to use {control} and all effect uses
// to use {effect} instead. Then rewire the dummy node to use start instead.
NodeProperties::ReplaceUses(start, start, effect, control);
NodeProperties::ReplaceUses(dummy, nullptr, start, start);
}
Node* WasmGraphBuilder::Binop(wasm::WasmOpcode opcode, Node* left, Node* right,
wasm::WasmCodePosition position) {
const Operator* op;
MachineOperatorBuilder* m = mcgraph()->machine();
switch (opcode) {
case wasm::kExprI32Add:
op = m->Int32Add();
break;
case wasm::kExprI32Sub:
op = m->Int32Sub();
break;
case wasm::kExprI32Mul:
op = m->Int32Mul();
break;
case wasm::kExprI32DivS:
return BuildI32DivS(left, right, position);
case wasm::kExprI32DivU:
return BuildI32DivU(left, right, position);
case wasm::kExprI32RemS:
return BuildI32RemS(left, right, position);
case wasm::kExprI32RemU:
return BuildI32RemU(left, right, position);
case wasm::kExprI32And:
op = m->Word32And();
break;
case wasm::kExprI32Ior:
op = m->Word32Or();
break;
case wasm::kExprI32Xor:
op = m->Word32Xor();
break;
case wasm::kExprI32Shl:
op = m->Word32Shl();
right = MaskShiftCount32(right);
break;
case wasm::kExprI32ShrU:
op = m->Word32Shr();
right = MaskShiftCount32(right);
break;
case wasm::kExprI32ShrS:
op = m->Word32Sar();
right = MaskShiftCount32(right);
break;
case wasm::kExprI32Ror:
op = m->Word32Ror();
right = MaskShiftCount32(right);
break;
case wasm::kExprI32Rol:
right = MaskShiftCount32(right);
return BuildI32Rol(left, right);
case wasm::kExprI32Eq:
op = m->Word32Equal();
break;
case wasm::kExprI32Ne:
return Invert(Binop(wasm::kExprI32Eq, left, right));
case wasm::kExprI32LtS:
op = m->Int32LessThan();
break;
case wasm::kExprI32LeS:
op = m->Int32LessThanOrEqual();
break;
case wasm::kExprI32LtU:
op = m->Uint32LessThan();
break;
case wasm::kExprI32LeU:
op = m->Uint32LessThanOrEqual();
break;
case wasm::kExprI32GtS:
op = m->Int32LessThan();
std::swap(left, right);
break;
case wasm::kExprI32GeS:
op = m->Int32LessThanOrEqual();
std::swap(left, right);
break;
case wasm::kExprI32GtU:
op = m->Uint32LessThan();
std::swap(left, right);
break;
case wasm::kExprI32GeU:
op = m->Uint32LessThanOrEqual();
std::swap(left, right);
break;
case wasm::kExprI64And:
op = m->Word64And();
break;
case wasm::kExprI64Add:
op = m->Int64Add();
break;
case wasm::kExprI64Sub:
op = m->Int64Sub();
break;
case wasm::kExprI64Mul:
op = m->Int64Mul();
break;
case wasm::kExprI64DivS:
return BuildI64DivS(left, right, position);
case wasm::kExprI64DivU:
return BuildI64DivU(left, right, position);
case wasm::kExprI64RemS:
return BuildI64RemS(left, right, position);
case wasm::kExprI64RemU:
return BuildI64RemU(left, right, position);
case wasm::kExprI64Ior:
op = m->Word64Or();
break;
case wasm::kExprI64Xor:
op = m->Word64Xor();
break;
case wasm::kExprI64Shl:
op = m->Word64Shl();
right = MaskShiftCount64(right);
break;
case wasm::kExprI64ShrU:
op = m->Word64Shr();
right = MaskShiftCount64(right);
break;
case wasm::kExprI64ShrS:
op = m->Word64Sar();
right = MaskShiftCount64(right);
break;
case wasm::kExprI64Eq:
op = m->Word64Equal();
break;
case wasm::kExprI64Ne:
return Invert(Binop(wasm::kExprI64Eq, left, right));
case wasm::kExprI64LtS:
op = m->Int64LessThan();
break;
case wasm::kExprI64LeS:
op = m->Int64LessThanOrEqual();
break;
case wasm::kExprI64LtU:
op = m->Uint64LessThan();
break;
case wasm::kExprI64LeU:
op = m->Uint64LessThanOrEqual();
break;
case wasm::kExprI64GtS:
op = m->Int64LessThan();
std::swap(left, right);
break;
case wasm::kExprI64GeS:
op = m->Int64LessThanOrEqual();
std::swap(left, right);
break;
case wasm::kExprI64GtU:
op = m->Uint64LessThan();
std::swap(left, right);
break;
case wasm::kExprI64GeU:
op = m->Uint64LessThanOrEqual();
std::swap(left, right);
break;
case wasm::kExprI64Ror:
op = m->Word64Ror();
right = MaskShiftCount64(right);
break;
case wasm::kExprI64Rol:
return BuildI64Rol(left, right);
case wasm::kExprF32CopySign:
return BuildF32CopySign(left, right);
case wasm::kExprF64CopySign:
return BuildF64CopySign(left, right);
case wasm::kExprF32Add:
op = m->Float32Add();
break;
case wasm::kExprF32Sub:
op = m->Float32Sub();
break;
case wasm::kExprF32Mul:
op = m->Float32Mul();
break;
case wasm::kExprF32Div:
op = m->Float32Div();
break;
case wasm::kExprF32Eq:
op = m->Float32Equal();
break;
case wasm::kExprF32Ne:
return Invert(Binop(wasm::kExprF32Eq, left, right));
case wasm::kExprF32Lt:
op = m->Float32LessThan();
break;
case wasm::kExprF32Ge:
op = m->Float32LessThanOrEqual();
std::swap(left, right);
break;
case wasm::kExprF32Gt:
op = m->Float32LessThan();
std::swap(left, right);
break;
case wasm::kExprF32Le:
op = m->Float32LessThanOrEqual();
break;
case wasm::kExprF64Add:
op = m->Float64Add();
break;
case wasm::kExprF64Sub:
op = m->Float64Sub();
break;
case wasm::kExprF64Mul:
op = m->Float64Mul();
break;
case wasm::kExprF64Div:
op = m->Float64Div();
break;
case wasm::kExprF64Eq:
op = m->Float64Equal();
break;
case wasm::kExprF64Ne:
return Invert(Binop(wasm::kExprF64Eq, left, right));
case wasm::kExprF64Lt:
op = m->Float64LessThan();
break;
case wasm::kExprF64Le:
op = m->Float64LessThanOrEqual();
break;
case wasm::kExprF64Gt:
op = m->Float64LessThan();
std::swap(left, right);
break;
case wasm::kExprF64Ge:
op = m->Float64LessThanOrEqual();
std::swap(left, right);
break;
case wasm::kExprF32Min:
op = m->Float32Min();
break;
case wasm::kExprF64Min:
op = m->Float64Min();
break;
case wasm::kExprF32Max:
op = m->Float32Max();
break;
case wasm::kExprF64Max:
op = m->Float64Max();
break;
case wasm::kExprF64Pow:
return BuildF64Pow(left, right);
case wasm::kExprF64Atan2:
op = m->Float64Atan2();
break;
case wasm::kExprF64Mod:
return BuildF64Mod(left, right);
case wasm::kExprI32AsmjsDivS:
return BuildI32AsmjsDivS(left, right);
case wasm::kExprI32AsmjsDivU:
return BuildI32AsmjsDivU(left, right);
case wasm::kExprI32AsmjsRemS:
return BuildI32AsmjsRemS(left, right);
case wasm::kExprI32AsmjsRemU:
return BuildI32AsmjsRemU(left, right);
case wasm::kExprI32AsmjsStoreMem8:
return BuildAsmjsStoreMem(MachineType::Int8(), left, right);
case wasm::kExprI32AsmjsStoreMem16:
return BuildAsmjsStoreMem(MachineType::Int16(), left, right);
case wasm::kExprI32AsmjsStoreMem:
return BuildAsmjsStoreMem(MachineType::Int32(), left, right);
case wasm::kExprF32AsmjsStoreMem:
return BuildAsmjsStoreMem(MachineType::Float32(), left, right);
case wasm::kExprF64AsmjsStoreMem:
return BuildAsmjsStoreMem(MachineType::Float64(), left, right);
default:
FATAL_UNSUPPORTED_OPCODE(opcode);
}
return graph()->NewNode(op, left, right);
}
Node* WasmGraphBuilder::Unop(wasm::WasmOpcode opcode, Node* input,
wasm::WasmCodePosition position) {
const Operator* op;
MachineOperatorBuilder* m = mcgraph()->machine();
switch (opcode) {
case wasm::kExprI32Eqz:
op = m->Word32Equal();
return graph()->NewNode(op, input, mcgraph()->Int32Constant(0));
case wasm::kExprF32Abs:
op = m->Float32Abs();
break;
case wasm::kExprF32Neg: {
op = m->Float32Neg();
break;
}
case wasm::kExprF32Sqrt:
op = m->Float32Sqrt();
break;
case wasm::kExprF64Abs:
op = m->Float64Abs();
break;
case wasm::kExprF64Neg: {
op = m->Float64Neg();
break;
}
case wasm::kExprF64Sqrt:
op = m->Float64Sqrt();
break;
case wasm::kExprI32SConvertF32:
case wasm::kExprI32UConvertF32:
case wasm::kExprI32SConvertF64:
case wasm::kExprI32UConvertF64:
case wasm::kExprI32SConvertSatF64:
case wasm::kExprI32UConvertSatF64:
case wasm::kExprI32SConvertSatF32:
case wasm::kExprI32UConvertSatF32:
return BuildIntConvertFloat(input, position, opcode);
case wasm::kExprI32AsmjsSConvertF64:
return BuildI32AsmjsSConvertF64(input);
case wasm::kExprI32AsmjsUConvertF64:
return BuildI32AsmjsUConvertF64(input);
case wasm::kExprF32ConvertF64:
op = m->TruncateFloat64ToFloat32();
break;
case wasm::kExprF64SConvertI32:
op = m->ChangeInt32ToFloat64();
break;
case wasm::kExprF64UConvertI32:
op = m->ChangeUint32ToFloat64();
break;
case wasm::kExprF32SConvertI32:
op = m->RoundInt32ToFloat32();
break;
case wasm::kExprF32UConvertI32:
op = m->RoundUint32ToFloat32();
break;
case wasm::kExprI32AsmjsSConvertF32:
return BuildI32AsmjsSConvertF32(input);
case wasm::kExprI32AsmjsUConvertF32:
return BuildI32AsmjsUConvertF32(input);
case wasm::kExprF64ConvertF32:
op = m->ChangeFloat32ToFloat64();
break;
case wasm::kExprF32ReinterpretI32:
op = m->BitcastInt32ToFloat32();
break;
case wasm::kExprI32ReinterpretF32:
op = m->BitcastFloat32ToInt32();
break;
case wasm::kExprI32Clz:
op = m->Word32Clz();
break;
case wasm::kExprI32Ctz: {
if (m->Word32Ctz().IsSupported()) {
op = m->Word32Ctz().op();
break;
} else if (m->Word32ReverseBits().IsSupported()) {
Node* reversed = graph()->NewNode(m->Word32ReverseBits().op(), input);
Node* result = graph()->NewNode(m->Word32Clz(), reversed);
return result;
} else {
return BuildI32Ctz(input);
}
}
case wasm::kExprI32Popcnt: {
if (m->Word32Popcnt().IsSupported()) {
op = m->Word32Popcnt().op();
break;
} else {
return BuildI32Popcnt(input);
}
}
case wasm::kExprF32Floor: {
if (!m->Float32RoundDown().IsSupported()) return BuildF32Floor(input);
op = m->Float32RoundDown().op();
break;
}
case wasm::kExprF32Ceil: {
if (!m->Float32RoundUp().IsSupported()) return BuildF32Ceil(input);
op = m->Float32RoundUp().op();
break;
}
case wasm::kExprF32Trunc: {
if (!m->Float32RoundTruncate().IsSupported()) return BuildF32Trunc(input);
op = m->Float32RoundTruncate().op();
break;
}
case wasm::kExprF32NearestInt: {
if (!m->Float32RoundTiesEven().IsSupported())
return BuildF32NearestInt(input);
op = m->Float32RoundTiesEven().op();
break;
}
case wasm::kExprF64Floor: {
if (!m->Float64RoundDown().IsSupported()) return BuildF64Floor(input);
op = m->Float64RoundDown().op();
break;
}
case wasm::kExprF64Ceil: {
if (!m->Float64RoundUp().IsSupported()) return BuildF64Ceil(input);
op = m->Float64RoundUp().op();
break;
}
case wasm::kExprF64Trunc: {
if (!m->Float64RoundTruncate().IsSupported()) return BuildF64Trunc(input);
op = m->Float64RoundTruncate().op();
break;
}
case wasm::kExprF64NearestInt: {
if (!m->Float64RoundTiesEven().IsSupported())
return BuildF64NearestInt(input);
op = m->Float64RoundTiesEven().op();
break;
}
case wasm::kExprF64Acos: {
return BuildF64Acos(input);
}
case wasm::kExprF64Asin: {
return BuildF64Asin(input);
}
case wasm::kExprF64Atan:
op = m->Float64Atan();
break;
case wasm::kExprF64Cos: {
op = m->Float64Cos();
break;
}
case wasm::kExprF64Sin: {
op = m->Float64Sin();
break;
}
case wasm::kExprF64Tan: {
op = m->Float64Tan();
break;
}
case wasm::kExprF64Exp: {
op = m->Float64Exp();
break;
}
case wasm::kExprF64Log:
op = m->Float64Log();
break;
case wasm::kExprI32ConvertI64:
op = m->TruncateInt64ToInt32();
break;
case wasm::kExprI64SConvertI32:
op = m->ChangeInt32ToInt64();
break;
case wasm::kExprI64UConvertI32:
op = m->ChangeUint32ToUint64();
break;
case wasm::kExprF64ReinterpretI64:
op = m->BitcastInt64ToFloat64();
break;
case wasm::kExprI64ReinterpretF64:
op = m->BitcastFloat64ToInt64();
break;
case wasm::kExprI64Clz:
op = m->Word64Clz();
break;
case wasm::kExprI64Ctz: {
OptionalOperator ctz64 = m->Word64Ctz();
if (ctz64.IsSupported()) {
op = ctz64.op();
break;
} else if (m->Is32() && m->Word32Ctz().IsSupported()) {
op = ctz64.placeholder();
break;
} else if (m->Word64ReverseBits().IsSupported()) {
Node* reversed = graph()->NewNode(m->Word64ReverseBits().op(), input);
Node* result = graph()->NewNode(m->Word64Clz(), reversed);
return result;
} else {
return BuildI64Ctz(input);
}
}
case wasm::kExprI64Popcnt: {
OptionalOperator popcnt64 = m->Word64Popcnt();
if (popcnt64.IsSupported()) {
op = popcnt64.op();
} else if (m->Is32() && m->Word32Popcnt().IsSupported()) {
op = popcnt64.placeholder();
} else {
return BuildI64Popcnt(input);
}
break;
}
case wasm::kExprI64Eqz:
op = m->Word64Equal();
return graph()->NewNode(op, input, mcgraph()->Int64Constant(0));
case wasm::kExprF32SConvertI64:
if (m->Is32()) {
return BuildF32SConvertI64(input);
}
op = m->RoundInt64ToFloat32();
break;
case wasm::kExprF32UConvertI64:
if (m->Is32()) {
return BuildF32UConvertI64(input);
}
op = m->RoundUint64ToFloat32();
break;
case wasm::kExprF64SConvertI64:
if (m->Is32()) {
return BuildF64SConvertI64(input);
}
op = m->RoundInt64ToFloat64();
break;
case wasm::kExprF64UConvertI64:
if (m->Is32()) {
return BuildF64UConvertI64(input);
}
op = m->RoundUint64ToFloat64();
break;
case wasm::kExprI32SExtendI8:
op = m->SignExtendWord8ToInt32();
break;
case wasm::kExprI32SExtendI16:
op = m->SignExtendWord16ToInt32();
break;
case wasm::kExprI64SExtendI8:
op = m->SignExtendWord8ToInt64();
break;
case wasm::kExprI64SExtendI16:
op = m->SignExtendWord16ToInt64();
break;
case wasm::kExprI64SExtendI32:
op = m->SignExtendWord32ToInt64();
break;
case wasm::kExprI64SConvertF32:
case wasm::kExprI64UConvertF32:
case wasm::kExprI64SConvertF64:
case wasm::kExprI64UConvertF64:
case wasm::kExprI64SConvertSatF32:
case wasm::kExprI64UConvertSatF32:
case wasm::kExprI64SConvertSatF64:
case wasm::kExprI64UConvertSatF64:
return mcgraph()->machine()->Is32()
? BuildCcallConvertFloat(input, position, opcode)
: BuildIntConvertFloat(input, position, opcode);
case wasm::kExprRefIsNull:
return graph()->NewNode(m->WordEqual(), input, RefNull());
case wasm::kExprI32AsmjsLoadMem8S:
return BuildAsmjsLoadMem(MachineType::Int8(), input);
case wasm::kExprI32AsmjsLoadMem8U:
return BuildAsmjsLoadMem(MachineType::Uint8(), input);
case wasm::kExprI32AsmjsLoadMem16S:
return BuildAsmjsLoadMem(MachineType::Int16(), input);
case wasm::kExprI32AsmjsLoadMem16U:
return BuildAsmjsLoadMem(MachineType::Uint16(), input);
case wasm::kExprI32AsmjsLoadMem:
return BuildAsmjsLoadMem(MachineType::Int32(), input);
case wasm::kExprF32AsmjsLoadMem:
return BuildAsmjsLoadMem(MachineType::Float32(), input);
case wasm::kExprF64AsmjsLoadMem:
return BuildAsmjsLoadMem(MachineType::Float64(), input);
default:
FATAL_UNSUPPORTED_OPCODE(opcode);
}
return graph()->NewNode(op, input);
}
Node* WasmGraphBuilder::Float32Constant(float value) {
return mcgraph()->Float32Constant(value);
}
Node* WasmGraphBuilder::Float64Constant(double value) {
return mcgraph()->Float64Constant(value);
}
namespace {
Node* Branch(MachineGraph* mcgraph, Node* cond, Node** true_node,
Node** false_node, Node* control, BranchHint hint) {
DCHECK_NOT_NULL(cond);
DCHECK_NOT_NULL(control);
Node* branch =
mcgraph->graph()->NewNode(mcgraph->common()->Branch(hint), cond, control);
*true_node = mcgraph->graph()->NewNode(mcgraph->common()->IfTrue(), branch);
*false_node = mcgraph->graph()->NewNode(mcgraph->common()->IfFalse(), branch);
return branch;
}
} // namespace
Node* WasmGraphBuilder::BranchNoHint(Node* cond, Node** true_node,
Node** false_node) {
return Branch(mcgraph(), cond, true_node, false_node, Control(),
BranchHint::kNone);
}
Node* WasmGraphBuilder::BranchExpectTrue(Node* cond, Node** true_node,
Node** false_node) {
return Branch(mcgraph(), cond, true_node, false_node, Control(),
BranchHint::kTrue);
}
Node* WasmGraphBuilder::BranchExpectFalse(Node* cond, Node** true_node,
Node** false_node) {
return Branch(mcgraph(), cond, true_node, false_node, Control(),
BranchHint::kFalse);
}
TrapId WasmGraphBuilder::GetTrapIdForTrap(wasm::TrapReason reason) {
// TODO(wasm): "!env_" should not happen when compiling an actual wasm
// function.
if (!env_ || !env_->runtime_exception_support) {
// We use TrapId::kInvalid as a marker to tell the code generator
// to generate a call to a testing c-function instead of a runtime
// stub. This code should only be called from a cctest.
return TrapId::kInvalid;
}
switch (reason) {
#define TRAPREASON_TO_TRAPID(name) \
case wasm::k##name: \
static_assert( \
static_cast<int>(TrapId::k##name) == wasm::WasmCode::kThrowWasm##name, \
"trap id mismatch"); \
return TrapId::k##name;
FOREACH_WASM_TRAPREASON(TRAPREASON_TO_TRAPID)
#undef TRAPREASON_TO_TRAPID
default:
UNREACHABLE();
}
}
Node* WasmGraphBuilder::TrapIfTrue(wasm::TrapReason reason, Node* cond,
wasm::WasmCodePosition position) {
TrapId trap_id = GetTrapIdForTrap(reason);
Node* node = SetControl(graph()->NewNode(mcgraph()->common()->TrapIf(trap_id),
cond, Effect(), Control()));
SetSourcePosition(node, position);
return node;
}
Node* WasmGraphBuilder::TrapIfFalse(wasm::TrapReason reason, Node* cond,
wasm::WasmCodePosition position) {
TrapId trap_id = GetTrapIdForTrap(reason);
Node* node = SetControl(graph()->NewNode(
mcgraph()->common()->TrapUnless(trap_id), cond, Effect(), Control()));
SetSourcePosition(node, position);
return node;
}
// Add a check that traps if {node} is equal to {val}.
Node* WasmGraphBuilder::TrapIfEq32(wasm::TrapReason reason, Node* node,
int32_t val,
wasm::WasmCodePosition position) {
Int32Matcher m(node);
if (m.HasValue() && !m.Is(val)) return graph()->start();
if (val == 0) {
return TrapIfFalse(reason, node, position);
} else {
return TrapIfTrue(reason,
graph()->NewNode(mcgraph()->machine()->Word32Equal(),
node, mcgraph()->Int32Constant(val)),
position);
}
}
// Add a check that traps if {node} is zero.
Node* WasmGraphBuilder::ZeroCheck32(wasm::TrapReason reason, Node* node,
wasm::WasmCodePosition position) {
return TrapIfEq32(reason, node, 0, position);
}
// Add a check that traps if {node} is equal to {val}.
Node* WasmGraphBuilder::TrapIfEq64(wasm::TrapReason reason, Node* node,
int64_t val,
wasm::WasmCodePosition position) {
Int64Matcher m(node);
if (m.HasValue() && !m.Is(val)) return graph()->start();
return TrapIfTrue(reason,
graph()->NewNode(mcgraph()->machine()->Word64Equal(), node,
mcgraph()->Int64Constant(val)),
position);
}
// Add a check that traps if {node} is zero.
Node* WasmGraphBuilder::ZeroCheck64(wasm::TrapReason reason, Node* node,
wasm::WasmCodePosition position) {
return TrapIfEq64(reason, node, 0, position);
}
Node* WasmGraphBuilder::Switch(unsigned count, Node* key) {
return graph()->NewNode(mcgraph()->common()->Switch(count), key, Control());
}
Node* WasmGraphBuilder::IfValue(int32_t value, Node* sw) {
DCHECK_EQ(IrOpcode::kSwitch, sw->opcode());
return graph()->NewNode(mcgraph()->common()->IfValue(value), sw);
}
Node* WasmGraphBuilder::IfDefault(Node* sw) {
DCHECK_EQ(IrOpcode::kSwitch, sw->opcode());
return graph()->NewNode(mcgraph()->common()->IfDefault(), sw);
}
Node* WasmGraphBuilder::Return(unsigned count, Node** vals) {
static const int kStackAllocatedNodeBufferSize = 8;
Node* stack_buffer[kStackAllocatedNodeBufferSize];
std::vector<Node*> heap_buffer;
Node** buf = stack_buffer;
if (count + 3 > kStackAllocatedNodeBufferSize) {
heap_buffer.resize(count + 3);
buf = heap_buffer.data();
}
buf[0] = mcgraph()->Int32Constant(0);
memcpy(buf + 1, vals, sizeof(void*) * count);
buf[count + 1] = Effect();
buf[count + 2] = Control();
Node* ret =
graph()->NewNode(mcgraph()->common()->Return(count), count + 3, buf);
MergeControlToEnd(mcgraph(), ret);
return ret;
}
Node* WasmGraphBuilder::ReturnVoid() { return Return(0, nullptr); }
Node* WasmGraphBuilder::Unreachable(wasm::WasmCodePosition position) {
TrapIfFalse(wasm::TrapReason::kTrapUnreachable, Int32Constant(0), position);
ReturnVoid();
return nullptr;
}
Node* WasmGraphBuilder::MaskShiftCount32(Node* node) {
static const int32_t kMask32 = 0x1F;
if (!mcgraph()->machine()->Word32ShiftIsSafe()) {
// Shifts by constants are so common we pattern-match them here.
Int32Matcher match(node);
if (match.HasValue()) {
int32_t masked = (match.Value() & kMask32);
if (match.Value() != masked) node = mcgraph()->Int32Constant(masked);
} else {
node = graph()->NewNode(mcgraph()->machine()->Word32And(), node,
mcgraph()->Int32Constant(kMask32));
}
}
return node;
}
Node* WasmGraphBuilder::MaskShiftCount64(Node* node) {
static const int64_t kMask64 = 0x3F;
if (!mcgraph()->machine()->Word32ShiftIsSafe()) {
// Shifts by constants are so common we pattern-match them here.
Int64Matcher match(node);
if (match.HasValue()) {
int64_t masked = (match.Value() & kMask64);
if (match.Value() != masked) node = mcgraph()->Int64Constant(masked);
} else {
node = graph()->NewNode(mcgraph()->machine()->Word64And(), node,
mcgraph()->Int64Constant(kMask64));
}
}
return node;
}
static bool ReverseBytesSupported(MachineOperatorBuilder* m,
size_t size_in_bytes) {
switch (size_in_bytes) {
case 4:
case 16:
return true;
case 8:
return m->Is64();
default:
break;
}
return false;
}
Node* WasmGraphBuilder::BuildChangeEndiannessStore(
Node* node, MachineRepresentation mem_rep, wasm::ValueType wasmtype) {
Node* result;
Node* value = node;
MachineOperatorBuilder* m = mcgraph()->machine();
int valueSizeInBytes = wasm::ValueTypes::ElementSizeInBytes(wasmtype);
int valueSizeInBits = 8 * valueSizeInBytes;
bool isFloat = false;
switch (wasmtype) {
case wasm::kWasmF64:
value = graph()->NewNode(m->BitcastFloat64ToInt64(), node);
isFloat = true;
V8_FALLTHROUGH;
case wasm::kWasmI64:
result = mcgraph()->Int64Constant(0);
break;
case wasm::kWasmF32:
value = graph()->NewNode(m->BitcastFloat32ToInt32(), node);
isFloat = true;
V8_FALLTHROUGH;
case wasm::kWasmI32:
result = mcgraph()->Int32Constant(0);
break;
case wasm::kWasmS128:
DCHECK(ReverseBytesSupported(m, valueSizeInBytes));
break;
default:
UNREACHABLE();
break;
}
if (mem_rep == MachineRepresentation::kWord8) {
// No need to change endianness for byte size, return original node
return node;
}
if (wasmtype == wasm::kWasmI64 && mem_rep < MachineRepresentation::kWord64) {
// In case we store lower part of WasmI64 expression, we can truncate
// upper 32bits
value = graph()->NewNode(m->TruncateInt64ToInt32(), value);
valueSizeInBytes = wasm::ValueTypes::ElementSizeInBytes(wasm::kWasmI32);
valueSizeInBits = 8 * valueSizeInBytes;
if (mem_rep == MachineRepresentation::kWord16) {
value =
graph()->NewNode(m->Word32Shl(), value, mcgraph()->Int32Constant(16));
}
} else if (wasmtype == wasm::kWasmI32 &&
mem_rep == MachineRepresentation::kWord16) {
value =
graph()->NewNode(m->Word32Shl(), value, mcgraph()->Int32Constant(16));
}
int i;
uint32_t shiftCount;
if (ReverseBytesSupported(m, valueSizeInBytes)) {
switch (valueSizeInBytes) {
case 4:
result = graph()->NewNode(m->Word32ReverseBytes(), value);
break;
case 8:
result = graph()->NewNode(m->Word64ReverseBytes(), value);
break;
case 16: {
Node* byte_reversed_lanes[4];
for (int lane = 0; lane < 4; lane++) {
byte_reversed_lanes[lane] = graph()->NewNode(
m->Word32ReverseBytes(),
graph()->NewNode(mcgraph()->machine()->I32x4ExtractLane(lane),
value));
}
// This is making a copy of the value.
result =
graph()->NewNode(mcgraph()->machine()->S128And(), value, value);
for (int lane = 0; lane < 4; lane++) {
result =
graph()->NewNode(mcgraph()->machine()->I32x4ReplaceLane(3 - lane),
result, byte_reversed_lanes[lane]);
}
break;
}
default:
UNREACHABLE();
break;
}
} else {
for (i = 0, shiftCount = valueSizeInBits - 8; i < valueSizeInBits / 2;
i += 8, shiftCount -= 16) {
Node* shiftLower;
Node* shiftHigher;
Node* lowerByte;
Node* higherByte;
DCHECK_LT(0, shiftCount);
DCHECK_EQ(0, (shiftCount + 8) % 16);
if (valueSizeInBits > 32) {
shiftLower = graph()->NewNode(m->Word64Shl(), value,
mcgraph()->Int64Constant(shiftCount));
shiftHigher = graph()->NewNode(m->Word64Shr(), value,
mcgraph()->Int64Constant(shiftCount));
lowerByte = graph()->NewNode(
m->Word64And(), shiftLower,
mcgraph()->Int64Constant(static_cast<uint64_t>(0xFF)
<< (valueSizeInBits - 8 - i)));
higherByte = graph()->NewNode(
m->Word64And(), shiftHigher,
mcgraph()->Int64Constant(static_cast<uint64_t>(0xFF) << i));
result = graph()->NewNode(m->Word64Or(), result, lowerByte);
result = graph()->NewNode(m->Word64Or(), result, higherByte);
} else {
shiftLower = graph()->NewNode(m->Word32Shl(), value,
mcgraph()->Int32Constant(shiftCount));
shiftHigher = graph()->NewNode(m->Word32Shr(), value,
mcgraph()->Int32Constant(shiftCount));
lowerByte = graph()->NewNode(
m->Word32And(), shiftLower,
mcgraph()->Int32Constant(static_cast<uint32_t>(0xFF)
<< (valueSizeInBits - 8 - i)));
higherByte = graph()->NewNode(
m->Word32And(), shiftHigher,
mcgraph()->Int32Constant(static_cast<uint32_t>(0xFF) << i));
result = graph()->NewNode(m->Word32Or(), result, lowerByte);
result = graph()->NewNode(m->Word32Or(), result, higherByte);
}
}
}
if (isFloat) {
switch (wasmtype) {
case wasm::kWasmF64:
result = graph()->NewNode(m->BitcastInt64ToFloat64(), result);
break;
case wasm::kWasmF32:
result = graph()->NewNode(m->BitcastInt32ToFloat32(), result);
break;
default:
UNREACHABLE();
break;
}
}
return result;
}
Node* WasmGraphBuilder::BuildChangeEndiannessLoad(Node* node,
MachineType memtype,
wasm::ValueType wasmtype) {
Node* result;
Node* value = node;
MachineOperatorBuilder* m = mcgraph()->machine();
int valueSizeInBytes = ElementSizeInBytes(memtype.representation());
int valueSizeInBits = 8 * valueSizeInBytes;
bool isFloat = false;
switch (memtype.representation()) {
case MachineRepresentation::kFloat64:
value = graph()->NewNode(m->BitcastFloat64ToInt64(), node);
isFloat = true;
V8_FALLTHROUGH;
case MachineRepresentation::kWord64:
result = mcgraph()->Int64Constant(0);
break;
case MachineRepresentation::kFloat32:
value = graph()->NewNode(m->BitcastFloat32ToInt32(), node);
isFloat = true;
V8_FALLTHROUGH;
case MachineRepresentation::kWord32:
case MachineRepresentation::kWord16:
result = mcgraph()->Int32Constant(0);
break;
case MachineRepresentation::kWord8:
// No need to change endianness for byte size, return original node
return node;
break;
case MachineRepresentation::kSimd128:
DCHECK(ReverseBytesSupported(m, valueSizeInBytes));
break;
default:
UNREACHABLE();
break;
}
int i;
uint32_t shiftCount;
if (ReverseBytesSupported(m, valueSizeInBytes < 4 ? 4 : valueSizeInBytes)) {
switch (valueSizeInBytes) {
case 2:
result =
graph()->NewNode(m->Word32ReverseBytes(),
graph()->NewNode(m->Word32Shl(), value,
mcgraph()->Int32Constant(16)));
break;
case 4:
result = graph()->NewNode(m->Word32ReverseBytes(), value);
break;
case 8:
result = graph()->NewNode(m->Word64ReverseBytes(), value);
break;
case 16: {
Node* byte_reversed_lanes[4];
for (int lane = 0; lane < 4; lane++) {
byte_reversed_lanes[lane] = graph()->NewNode(
m->Word32ReverseBytes(),
graph()->NewNode(mcgraph()->machine()->I32x4ExtractLane(lane),
value));
}
// This is making a copy of the value.
result =
graph()->NewNode(mcgraph()->machine()->S128And(), value, value);
for (int lane = 0; lane < 4; lane++) {
result =
graph()->NewNode(mcgraph()->machine()->I32x4ReplaceLane(3 - lane),
result, byte_reversed_lanes[lane]);
}
break;
}
default:
UNREACHABLE();
}
} else {
for (i = 0, shiftCount = valueSizeInBits - 8; i < valueSizeInBits / 2;
i += 8, shiftCount -= 16) {
Node* shiftLower;
Node* shiftHigher;
Node* lowerByte;
Node* higherByte;
DCHECK_LT(0, shiftCount);
DCHECK_EQ(0, (shiftCount + 8) % 16);
if (valueSizeInBits > 32) {
shiftLower = graph()->NewNode(m->Word64Shl(), value,
mcgraph()->Int64Constant(shiftCount));
shiftHigher = graph()->NewNode(m->Word64Shr(), value,
mcgraph()->Int64Constant(shiftCount));
lowerByte = graph()->NewNode(
m->Word64And(), shiftLower,
mcgraph()->Int64Constant(static_cast<uint64_t>(0xFF)
<< (valueSizeInBits - 8 - i)));
higherByte = graph()->NewNode(
m->Word64And(), shiftHigher,
mcgraph()->Int64Constant(static_cast<uint64_t>(0xFF) << i));
result = graph()->NewNode(m->Word64Or(), result, lowerByte);
result = graph()->NewNode(m->Word64Or(), result, higherByte);
} else {
shiftLower = graph()->NewNode(m->Word32Shl(), value,
mcgraph()->Int32Constant(shiftCount));
shiftHigher = graph()->NewNode(m->Word32Shr(), value,
mcgraph()->Int32Constant(shiftCount));
lowerByte = graph()->NewNode(
m->Word32And(), shiftLower,
mcgraph()->Int32Constant(static_cast<uint32_t>(0xFF)
<< (valueSizeInBits - 8 - i)));
higherByte = graph()->NewNode(
m->Word32And(), shiftHigher,
mcgraph()->Int32Constant(static_cast<uint32_t>(0xFF) << i));
result = graph()->NewNode(m->Word32Or(), result, lowerByte);
result = graph()->NewNode(m->Word32Or(), result, higherByte);
}
}
}
if (isFloat) {
switch (memtype.representation()) {
case MachineRepresentation::kFloat64:
result = graph()->NewNode(m->BitcastInt64ToFloat64(), result);
break;
case MachineRepresentation::kFloat32:
result = graph()->NewNode(m->BitcastInt32ToFloat32(), result);
break;
default:
UNREACHABLE();
break;
}
}
// We need to sign extend the value
if (memtype.IsSigned()) {
DCHECK(!isFloat);
if (valueSizeInBits < 32) {
Node* shiftBitCount;
// Perform sign extension using following trick
// result = (x << machine_width - type_width) >> (machine_width -
// type_width)
if (wasmtype == wasm::kWasmI64) {
shiftBitCount = mcgraph()->Int32Constant(64 - valueSizeInBits);
result = graph()->NewNode(
m->Word64Sar(),
graph()->NewNode(m->Word64Shl(),
graph()->NewNode(m->ChangeInt32ToInt64(), result),
shiftBitCount),
shiftBitCount);
} else if (wasmtype == wasm::kWasmI32) {
shiftBitCount = mcgraph()->Int32Constant(32 - valueSizeInBits);
result = graph()->NewNode(
m->Word32Sar(),
graph()->NewNode(m->Word32Shl(), result, shiftBitCount),
shiftBitCount);
}
}
}
return result;
}
Node* WasmGraphBuilder::BuildF32CopySign(Node* left, Node* right) {
Node* result = Unop(
wasm::kExprF32ReinterpretI32,
Binop(wasm::kExprI32Ior,
Binop(wasm::kExprI32And, Unop(wasm::kExprI32ReinterpretF32, left),
mcgraph()->Int32Constant(0x7FFFFFFF)),
Binop(wasm::kExprI32And, Unop(wasm::kExprI32ReinterpretF32, right),
mcgraph()->Int32Constant(0x80000000))));
return result;
}
Node* WasmGraphBuilder::BuildF64CopySign(Node* left, Node* right) {
#if WASM_64
Node* result = Unop(
wasm::kExprF64ReinterpretI64,
Binop(wasm::kExprI64Ior,
Binop(wasm::kExprI64And, Unop(wasm::kExprI64ReinterpretF64, left),
mcgraph()->Int64Constant(0x7FFFFFFFFFFFFFFF)),
Binop(wasm::kExprI64And, Unop(wasm::kExprI64ReinterpretF64, right),
mcgraph()->Int64Constant(0x8000000000000000))));
return result;
#else
MachineOperatorBuilder* m = mcgraph()->machine();
Node* high_word_left = graph()->NewNode(m->Float64ExtractHighWord32(), left);
Node* high_word_right =
graph()->NewNode(m->Float64ExtractHighWord32(), right);
Node* new_high_word = Binop(wasm::kExprI32Ior,
Binop(wasm::kExprI32And, high_word_left,
mcgraph()->Int32Constant(0x7FFFFFFF)),
Binop(wasm::kExprI32And, high_word_right,
mcgraph()->Int32Constant(0x80000000)));
return graph()->NewNode(m->Float64InsertHighWord32(), left, new_high_word);
#endif
}
namespace {
MachineType IntConvertType(wasm::WasmOpcode opcode) {
switch (opcode) {
case wasm::kExprI32SConvertF32:
case wasm::kExprI32SConvertF64:
case wasm::kExprI32SConvertSatF32:
case wasm::kExprI32SConvertSatF64:
return MachineType::Int32();
case wasm::kExprI32UConvertF32:
case wasm::kExprI32UConvertF64:
case wasm::kExprI32UConvertSatF32:
case wasm::kExprI32UConvertSatF64:
return MachineType::Uint32();
case wasm::kExprI64SConvertF32:
case wasm::kExprI64SConvertF64:
case wasm::kExprI64SConvertSatF32:
case wasm::kExprI64SConvertSatF64:
return MachineType::Int64();
case wasm::kExprI64UConvertF32:
case wasm::kExprI64UConvertF64:
case wasm::kExprI64UConvertSatF32:
case wasm::kExprI64UConvertSatF64:
return MachineType::Uint64();
default:
UNREACHABLE();
}
}
MachineType FloatConvertType(wasm::WasmOpcode opcode) {
switch (opcode) {
case wasm::kExprI32SConvertF32:
case wasm::kExprI32UConvertF32:
case wasm::kExprI32SConvertSatF32:
case wasm::kExprI64SConvertF32:
case wasm::kExprI64UConvertF32:
case wasm::kExprI32UConvertSatF32:
case wasm::kExprI64SConvertSatF32:
case wasm::kExprI64UConvertSatF32:
return MachineType::Float32();
case wasm::kExprI32SConvertF64:
case wasm::kExprI32UConvertF64:
case wasm::kExprI64SConvertF64:
case wasm::kExprI64UConvertF64:
case wasm::kExprI32SConvertSatF64:
case wasm::kExprI32UConvertSatF64:
case wasm::kExprI64SConvertSatF64:
case wasm::kExprI64UConvertSatF64:
return MachineType::Float64();
default:
UNREACHABLE();
}
}
const Operator* ConvertOp(WasmGraphBuilder* builder, wasm::WasmOpcode opcode) {
switch (opcode) {
case wasm::kExprI32SConvertF32:
case wasm::kExprI32SConvertSatF32:
return builder->mcgraph()->machine()->TruncateFloat32ToInt32();
case wasm::kExprI32UConvertF32:
case wasm::kExprI32UConvertSatF32:
return builder->mcgraph()->machine()->TruncateFloat32ToUint32();
case wasm::kExprI32SConvertF64:
case wasm::kExprI32SConvertSatF64:
return builder->mcgraph()->machine()->ChangeFloat64ToInt32();
case wasm::kExprI32UConvertF64:
case wasm::kExprI32UConvertSatF64:
return builder->mcgraph()->machine()->TruncateFloat64ToUint32();
case wasm::kExprI64SConvertF32:
case wasm::kExprI64SConvertSatF32:
return builder->mcgraph()->machine()->TryTruncateFloat32ToInt64();
case wasm::kExprI64UConvertF32:
case wasm::kExprI64UConvertSatF32:
return builder->mcgraph()->machine()->TryTruncateFloat32ToUint64();
case wasm::kExprI64SConvertF64:
case wasm::kExprI64SConvertSatF64:
return builder->mcgraph()->machine()->TryTruncateFloat64ToInt64();
case wasm::kExprI64UConvertF64:
case wasm::kExprI64UConvertSatF64:
return builder->mcgraph()->machine()->TryTruncateFloat64ToUint64();
default:
UNREACHABLE();
}
}
wasm::WasmOpcode ConvertBackOp(wasm::WasmOpcode opcode) {
switch (opcode) {
case wasm::kExprI32SConvertF32:
case wasm::kExprI32SConvertSatF32:
return wasm::kExprF32SConvertI32;
case wasm::kExprI32UConvertF32:
case wasm::kExprI32UConvertSatF32:
return wasm::kExprF32UConvertI32;
case wasm::kExprI32SConvertF64:
case wasm::kExprI32SConvertSatF64:
return wasm::kExprF64SConvertI32;
case wasm::kExprI32UConvertF64:
case wasm::kExprI32UConvertSatF64:
return wasm::kExprF64UConvertI32;
default:
UNREACHABLE();
}
}
bool IsTrappingConvertOp(wasm::WasmOpcode opcode) {
switch (opcode) {
case wasm::kExprI32SConvertF32:
case wasm::kExprI32UConvertF32:
case wasm::kExprI32SConvertF64:
case wasm::kExprI32UConvertF64:
case wasm::kExprI64SConvertF32:
case wasm::kExprI64UConvertF32:
case wasm::kExprI64SConvertF64:
case wasm::kExprI64UConvertF64:
return true;
case wasm::kExprI32SConvertSatF64:
case wasm::kExprI32UConvertSatF64:
case wasm::kExprI32SConvertSatF32:
case wasm::kExprI32UConvertSatF32:
case wasm::kExprI64SConvertSatF32:
case wasm::kExprI64UConvertSatF32:
case wasm::kExprI64SConvertSatF64:
case wasm::kExprI64UConvertSatF64:
return false;
default:
UNREACHABLE();
}
}
Node* Zero(WasmGraphBuilder* builder, const MachineType& ty) {
switch (ty.representation()) {
case MachineRepresentation::kWord32:
return builder->Int32Constant(0);
case MachineRepresentation::kWord64:
return builder->Int64Constant(0);
case MachineRepresentation::kFloat32:
return builder->Float32Constant(0.0);
case MachineRepresentation::kFloat64:
return builder->Float64Constant(0.0);
default:
UNREACHABLE();
}
}
Node* Min(WasmGraphBuilder* builder, const MachineType& ty) {
switch (ty.semantic()) {
case MachineSemantic::kInt32:
return builder->Int32Constant(std::numeric_limits<int32_t>::min());
case MachineSemantic::kUint32:
return builder->Int32Constant(std::numeric_limits<uint32_t>::min());
case MachineSemantic::kInt64:
return builder->Int64Constant(std::numeric_limits<int64_t>::min());
case MachineSemantic::kUint64:
return builder->Int64Constant(std::numeric_limits<uint64_t>::min());
default:
UNREACHABLE();
}
}
Node* Max(WasmGraphBuilder* builder, const MachineType& ty) {
switch (ty.semantic()) {
case MachineSemantic::kInt32:
return builder->Int32Constant(std::numeric_limits<int32_t>::max());
case MachineSemantic::kUint32:
return builder->Int32Constant(std::numeric_limits<uint32_t>::max());
case MachineSemantic::kInt64:
return builder->Int64Constant(std::numeric_limits<int64_t>::max());
case MachineSemantic::kUint64:
return builder->Int64Constant(std::numeric_limits<uint64_t>::max());
default:
UNREACHABLE();
}
}
wasm::WasmOpcode TruncOp(const MachineType& ty) {
switch (ty.representation()) {
case MachineRepresentation::kFloat32:
return wasm::kExprF32Trunc;
case MachineRepresentation::kFloat64:
return wasm::kExprF64Trunc;
default:
UNREACHABLE();
}
}
wasm::WasmOpcode NeOp(const MachineType& ty) {
switch (ty.representation()) {
case MachineRepresentation::kFloat32:
return wasm::kExprF32Ne;
case MachineRepresentation::kFloat64:
return wasm::kExprF64Ne;
default:
UNREACHABLE();
}
}
wasm::WasmOpcode LtOp(const MachineType& ty) {
switch (ty.representation()) {
case MachineRepresentation::kFloat32:
return wasm::kExprF32Lt;
case MachineRepresentation::kFloat64:
return wasm::kExprF64Lt;
default:
UNREACHABLE();
}
}
Node* ConvertTrapTest(WasmGraphBuilder* builder, wasm::WasmOpcode opcode,
const MachineType& int_ty, const MachineType& float_ty,
Node* trunc, Node* converted_value) {
if (int_ty.representation() == MachineRepresentation::kWord32) {
Node* check = builder->Unop(ConvertBackOp(opcode), converted_value);
return builder->Binop(NeOp(float_ty), trunc, check);
}
return builder->graph()->NewNode(builder->mcgraph()->common()->Projection(1),
trunc, builder->graph()->start());
}
Node* ConvertSaturateTest(WasmGraphBuilder* builder, wasm::WasmOpcode opcode,
const MachineType& int_ty,
const MachineType& float_ty, Node* trunc,
Node* converted_value) {
Node* test = ConvertTrapTest(builder, opcode, int_ty, float_ty, trunc,
converted_value);
if (int_ty.representation() == MachineRepresentation::kWord64) {
test = builder->Binop(wasm::kExprI64Eq, test, builder->Int64Constant(0));
}
return test;
}
} // namespace
Node* WasmGraphBuilder::BuildIntConvertFloat(Node* input,
wasm::WasmCodePosition position,
wasm::WasmOpcode opcode) {
const MachineType int_ty = IntConvertType(opcode);
const MachineType float_ty = FloatConvertType(opcode);
const Operator* conv_op = ConvertOp(this, opcode);
Node* trunc = nullptr;
Node* converted_value = nullptr;
const bool is_int32 =
int_ty.representation() == MachineRepresentation::kWord32;
if (is_int32) {
trunc = Unop(TruncOp(float_ty), input);
converted_value = graph()->NewNode(conv_op, trunc);
} else {
trunc = graph()->NewNode(conv_op, input);
converted_value = graph()->NewNode(mcgraph()->common()->Projection(0),
trunc, graph()->start());
}
if (IsTrappingConvertOp(opcode)) {
Node* test =
ConvertTrapTest(this, opcode, int_ty, float_ty, trunc, converted_value);
if (is_int32) {
TrapIfTrue(wasm::kTrapFloatUnrepresentable, test, position);
} else {
ZeroCheck64(wasm::kTrapFloatUnrepresentable, test, position);
}
return converted_value;
}
Node* test = ConvertSaturateTest(this, opcode, int_ty, float_ty, trunc,
converted_value);
Diamond tl_d(graph(), mcgraph()->common(), test, BranchHint::kFalse);
tl_d.Chain(Control());
Node* nan_test = Binop(NeOp(float_ty), input, input);
Diamond nan_d(graph(), mcgraph()->common(), nan_test, BranchHint::kFalse);
nan_d.Nest(tl_d, true);
Node* neg_test = Binop(LtOp(float_ty), input, Zero(this, float_ty));
Diamond sat_d(graph(), mcgraph()->common(), neg_test, BranchHint::kNone);
sat_d.Nest(nan_d, false);
Node* sat_val =
sat_d.Phi(int_ty.representation(), Min(this, int_ty), Max(this, int_ty));
Node* nan_val =
nan_d.Phi(int_ty.representation(), Zero(this, int_ty), sat_val);
return tl_d.Phi(int_ty.representation(), nan_val, converted_value);
}
Node* WasmGraphBuilder::BuildI32AsmjsSConvertF32(Node* input) {
MachineOperatorBuilder* m = mcgraph()->machine();
// asm.js must use the wacky JS semantics.
input = graph()->NewNode(m->ChangeFloat32ToFloat64(), input);
return graph()->NewNode(m->TruncateFloat64ToWord32(), input);
}
Node* WasmGraphBuilder::BuildI32AsmjsSConvertF64(Node* input) {
MachineOperatorBuilder* m = mcgraph()->machine();
// asm.js must use the wacky JS semantics.
return graph()->NewNode(m->TruncateFloat64ToWord32(), input);
}
Node* WasmGraphBuilder::BuildI32AsmjsUConvertF32(Node* input) {
MachineOperatorBuilder* m = mcgraph()->machine();
// asm.js must use the wacky JS semantics.
input = graph()->NewNode(m->ChangeFloat32ToFloat64(), input);
return graph()->NewNode(m->TruncateFloat64ToWord32(), input);
}
Node* WasmGraphBuilder::BuildI32AsmjsUConvertF64(Node* input) {
MachineOperatorBuilder* m = mcgraph()->machine();
// asm.js must use the wacky JS semantics.
return graph()->NewNode(m->TruncateFloat64ToWord32(), input);
}
Node* WasmGraphBuilder::BuildBitCountingCall(Node* input, ExternalReference ref,
MachineRepresentation input_type) {
Node* stack_slot_param =
graph()->NewNode(mcgraph()->machine()->StackSlot(input_type));
const Operator* store_op = mcgraph()->machine()->Store(
StoreRepresentation(input_type, kNoWriteBarrier));
SetEffect(graph()->NewNode(store_op, stack_slot_param,
mcgraph()->Int32Constant(0), input, Effect(),
Control()));
MachineType sig_types[] = {MachineType::Int32(), MachineType::Pointer()};
MachineSignature sig(1, 1, sig_types);
Node* function = graph()->NewNode(mcgraph()->common()->ExternalConstant(ref));
return BuildCCall(&sig, function, stack_slot_param);
}
Node* WasmGraphBuilder::BuildI32Ctz(Node* input) {
return BuildBitCountingCall(input, ExternalReference::wasm_word32_ctz(),
MachineRepresentation::kWord32);
}
Node* WasmGraphBuilder::BuildI64Ctz(Node* input) {
return Unop(wasm::kExprI64UConvertI32,
BuildBitCountingCall(input, ExternalReference::wasm_word64_ctz(),
MachineRepresentation::kWord64));
}
Node* WasmGraphBuilder::BuildI32Popcnt(Node* input) {
return BuildBitCountingCall(input, ExternalReference::wasm_word32_popcnt(),
MachineRepresentation::kWord32);
}
Node* WasmGraphBuilder::BuildI64Popcnt(Node* input) {
return Unop(
wasm::kExprI64UConvertI32,
BuildBitCountingCall(input, ExternalReference::wasm_word64_popcnt(),
MachineRepresentation::kWord64));
}
Node* WasmGraphBuilder::BuildF32Trunc(Node* input) {
MachineType type = MachineType::Float32();
ExternalReference ref = ExternalReference::wasm_f32_trunc();
return BuildCFuncInstruction(ref, type, input);
}
Node* WasmGraphBuilder::BuildF32Floor(Node* input) {
MachineType type = MachineType::Float32();
ExternalReference ref = ExternalReference::wasm_f32_floor();
return BuildCFuncInstruction(ref, type, input);
}
Node* WasmGraphBuilder::BuildF32Ceil(Node* input) {
MachineType type = MachineType::Float32();
ExternalReference ref = ExternalReference::wasm_f32_ceil();
return BuildCFuncInstruction(ref, type, input);
}
Node* WasmGraphBuilder::BuildF32NearestInt(Node* input) {
MachineType type = MachineType::Float32();
ExternalReference ref = ExternalReference::wasm_f32_nearest_int();
return BuildCFuncInstruction(ref, type, input);
}
Node* WasmGraphBuilder::BuildF64Trunc(Node* input) {
MachineType type = MachineType::Float64();
ExternalReference ref = ExternalReference::wasm_f64_trunc();
return BuildCFuncInstruction(ref, type, input);
}
Node* WasmGraphBuilder::BuildF64Floor(Node* input) {
MachineType type = MachineType::Float64();
ExternalReference ref = ExternalReference::wasm_f64_floor();
return BuildCFuncInstruction(ref, type, input);
}
Node* WasmGraphBuilder::BuildF64Ceil(Node* input) {
MachineType type = MachineType::Float64();
ExternalReference ref = ExternalReference::wasm_f64_ceil();
return BuildCFuncInstruction(ref, type, input);
}
Node* WasmGraphBuilder::BuildF64NearestInt(Node* input) {
MachineType type = MachineType::Float64();
ExternalReference ref = ExternalReference::wasm_f64_nearest_int();
return BuildCFuncInstruction(ref, type, input);
}
Node* WasmGraphBuilder::BuildF64Acos(Node* input) {
MachineType type = MachineType::Float64();
ExternalReference ref = ExternalReference::f64_acos_wrapper_function();
return BuildCFuncInstruction(ref, type, input);
}
Node* WasmGraphBuilder::BuildF64Asin(Node* input) {
MachineType type = MachineType::Float64();
ExternalReference ref = ExternalReference::f64_asin_wrapper_function();
return BuildCFuncInstruction(ref, type, input);
}
Node* WasmGraphBuilder::BuildF64Pow(Node* left, Node* right) {
MachineType type = MachineType::Float64();
ExternalReference ref = ExternalReference::wasm_float64_pow();
return BuildCFuncInstruction(ref, type, left, right);
}
Node* WasmGraphBuilder::BuildF64Mod(Node* left, Node* right) {
MachineType type = MachineType::Float64();
ExternalReference ref = ExternalReference::f64_mod_wrapper_function();
return BuildCFuncInstruction(ref, type, left, right);
}
Node* WasmGraphBuilder::BuildCFuncInstruction(ExternalReference ref,
MachineType type, Node* input0,
Node* input1) {
// We do truncation by calling a C function which calculates the result.
// The input is passed to the C function as a byte buffer holding the two
// input doubles. We reserve this byte buffer as a stack slot, store the
// parameters in this buffer slots, pass a pointer to the buffer to the C
// function, and after calling the C function we collect the return value from
// the buffer.
const int type_size = ElementSizeInBytes(type.representation());
const int stack_slot_bytes = (input1 == nullptr ? 1 : 2) * type_size;
Node* stack_slot =
graph()->NewNode(mcgraph()->machine()->StackSlot(stack_slot_bytes));
const Operator* store_op = mcgraph()->machine()->Store(
StoreRepresentation(type.representation(), kNoWriteBarrier));
SetEffect(graph()->NewNode(store_op, stack_slot, mcgraph()->Int32Constant(0),
input0, Effect(), Control()));
Node* function = graph()->NewNode(mcgraph()->common()->ExternalConstant(ref));
if (input1 != nullptr) {
SetEffect(graph()->NewNode(store_op, stack_slot,
mcgraph()->Int32Constant(type_size), input1,
Effect(), Control()));
}
MachineType sig_types[] = {MachineType::Pointer()};
MachineSignature sig(0, 1, sig_types);
BuildCCall(&sig, function, stack_slot);
return SetEffect(graph()->NewNode(mcgraph()->machine()->Load(type),
stack_slot, mcgraph()->Int32Constant(0),
Effect(), Control()));
}
Node* WasmGraphBuilder::BuildF32SConvertI64(Node* input) {
// TODO(titzer/bradnelson): Check handlng of asm.js case.
return BuildIntToFloatConversionInstruction(
input, ExternalReference::wasm_int64_to_float32(),
MachineRepresentation::kWord64, MachineType::Float32());
}
Node* WasmGraphBuilder::BuildF32UConvertI64(Node* input) {
// TODO(titzer/bradnelson): Check handlng of asm.js case.
return BuildIntToFloatConversionInstruction(
input, ExternalReference::wasm_uint64_to_float32(),
MachineRepresentation::kWord64, MachineType::Float32());
}
Node* WasmGraphBuilder::BuildF64SConvertI64(Node* input) {
return BuildIntToFloatConversionInstruction(
input, ExternalReference::wasm_int64_to_float64(),
MachineRepresentation::kWord64, MachineType::Float64());
}
Node* WasmGraphBuilder::BuildF64UConvertI64(Node* input) {
return BuildIntToFloatConversionInstruction(
input, ExternalReference::wasm_uint64_to_float64(),
MachineRepresentation::kWord64, MachineType::Float64());
}
Node* WasmGraphBuilder::BuildIntToFloatConversionInstruction(
Node* input, ExternalReference ref,
MachineRepresentation parameter_representation,
const MachineType result_type) {
int stack_slot_size =
std::max(ElementSizeInBytes(parameter_representation),
ElementSizeInBytes(result_type.representation()));
Node* stack_slot =
graph()->NewNode(mcgraph()->machine()->StackSlot(stack_slot_size));
const Operator* store_op = mcgraph()->machine()->Store(
StoreRepresentation(parameter_representation, kNoWriteBarrier));
SetEffect(graph()->NewNode(store_op, stack_slot, mcgraph()->Int32Constant(0),
input, Effect(), Control()));
MachineType sig_types[] = {MachineType::Pointer()};
MachineSignature sig(0, 1, sig_types);
Node* function = graph()->NewNode(mcgraph()->common()->ExternalConstant(ref));
BuildCCall(&sig, function, stack_slot);
return SetEffect(graph()->NewNode(mcgraph()->machine()->Load(result_type),
stack_slot, mcgraph()->Int32Constant(0),
Effect(), Control()));
}
namespace {
ExternalReference convert_ccall_ref(WasmGraphBuilder* builder,
wasm::WasmOpcode opcode) {
switch (opcode) {
case wasm::kExprI64SConvertF32:
case wasm::kExprI64SConvertSatF32:
return ExternalReference::wasm_float32_to_int64();
case wasm::kExprI64UConvertF32:
case wasm::kExprI64UConvertSatF32:
return ExternalReference::wasm_float32_to_uint64();
case wasm::kExprI64SConvertF64:
case wasm::kExprI64SConvertSatF64:
return ExternalReference::wasm_float64_to_int64();
case wasm::kExprI64UConvertF64:
case wasm::kExprI64UConvertSatF64:
return ExternalReference::wasm_float64_to_uint64();
default:
UNREACHABLE();
}
}
} // namespace
Node* WasmGraphBuilder::BuildCcallConvertFloat(Node* input,
wasm::WasmCodePosition position,
wasm::WasmOpcode opcode) {
const MachineType int_ty = IntConvertType(opcode);
const MachineType float_ty = FloatConvertType(opcode);
ExternalReference call_ref = convert_ccall_ref(this, opcode);
int stack_slot_size = std::max(ElementSizeInBytes(int_ty.representation()),
ElementSizeInBytes(float_ty.representation()));
Node* stack_slot =
graph()->NewNode(mcgraph()->machine()->StackSlot(stack_slot_size));
const Operator* store_op = mcgraph()->machine()->Store(
StoreRepresentation(float_ty.representation(), kNoWriteBarrier));
SetEffect(graph()->NewNode(store_op, stack_slot, Int32Constant(0), input,
Effect(), Control()));
MachineType sig_types[] = {MachineType::Int32(), MachineType::Pointer()};
MachineSignature sig(1, 1, sig_types);
Node* function =
graph()->NewNode(mcgraph()->common()->ExternalConstant(call_ref));
Node* overflow = BuildCCall(&sig, function, stack_slot);
if (IsTrappingConvertOp(opcode)) {
ZeroCheck32(wasm::kTrapFloatUnrepresentable, overflow, position);
return SetEffect(graph()->NewNode(mcgraph()->machine()->Load(int_ty),
stack_slot, Int32Constant(0), Effect(),
Control()));
}
Node* test = Binop(wasm::kExprI32Eq, overflow, Int32Constant(0), position);
Diamond tl_d(graph(), mcgraph()->common(), test, BranchHint::kFalse);
tl_d.Chain(Control());
Node* nan_test = Binop(NeOp(float_ty), input, input);
Diamond nan_d(graph(), mcgraph()->common(), nan_test, BranchHint::kFalse);
nan_d.Nest(tl_d, true);
Node* neg_test = Binop(LtOp(float_ty), input, Zero(this, float_ty));
Diamond sat_d(graph(), mcgraph()->common(), neg_test, BranchHint::kNone);
sat_d.Nest(nan_d, false);
Node* sat_val =
sat_d.Phi(int_ty.representation(), Min(this, int_ty), Max(this, int_ty));
Node* load =
SetEffect(graph()->NewNode(mcgraph()->machine()->Load(int_ty), stack_slot,
Int32Constant(0), Effect(), Control()));
Node* nan_val =
nan_d.Phi(int_ty.representation(), Zero(this, int_ty), sat_val);
return tl_d.Phi(int_ty.representation(), nan_val, load);
}
Node* WasmGraphBuilder::GrowMemory(Node* input) {
SetNeedsStackCheck();
WasmGrowMemoryDescriptor interface_descriptor;
auto call_descriptor = Linkage::GetStubCallDescriptor(
mcgraph()->zone(), // zone
interface_descriptor, // descriptor
interface_descriptor.GetStackParameterCount(), // stack parameter count
CallDescriptor::kNoFlags, // flags
Operator::kNoProperties, // properties
StubCallMode::kCallWasmRuntimeStub); // stub call mode
// A direct call to a wasm runtime stub defined in this module.
// Just encode the stub index. This will be patched at relocation.
Node* call_target = mcgraph()->RelocatableIntPtrConstant(
wasm::WasmCode::kWasmGrowMemory, RelocInfo::WASM_STUB_CALL);
return SetEffect(
SetControl(graph()->NewNode(mcgraph()->common()->Call(call_descriptor),
call_target, input, Effect(), Control())));
}
uint32_t WasmGraphBuilder::GetExceptionEncodedSize(
const wasm::WasmException* exception) const {
const wasm::WasmExceptionSig* sig = exception->sig;
uint32_t encoded_size = 0;
for (size_t i = 0; i < sig->parameter_count(); ++i) {
size_t byte_size = static_cast<size_t>(
wasm::ValueTypes::ElementSizeInBytes(sig->GetParam(i)));
DCHECK_EQ(byte_size % kBytesPerExceptionValuesArrayElement, 0);
DCHECK_LE(1, byte_size / kBytesPerExceptionValuesArrayElement);
encoded_size += byte_size / kBytesPerExceptionValuesArrayElement;
}
return encoded_size;
}
Node* WasmGraphBuilder::Throw(uint32_t tag,
const wasm::WasmException* exception,
const Vector<Node*> values) {
SetNeedsStackCheck();
uint32_t encoded_size = GetExceptionEncodedSize(exception);
Node* create_parameters[] = {
BuildChangeUint31ToSmi(ConvertExceptionTagToRuntimeId(tag)),
BuildChangeUint31ToSmi(Uint32Constant(encoded_size))};
BuildCallToRuntime(Runtime::kWasmThrowCreate, create_parameters,
arraysize(create_parameters));
uint32_t index = 0;
const wasm::WasmExceptionSig* sig = exception->sig;
MachineOperatorBuilder* m = mcgraph()->machine();
for (size_t i = 0; i < sig->parameter_count(); ++i) {
Node* value = values[i];
switch (sig->GetParam(i)) {
case wasm::kWasmF32:
value = graph()->NewNode(m->BitcastFloat32ToInt32(), value);
V8_FALLTHROUGH;
case wasm::kWasmI32:
BuildEncodeException32BitValue(&index, value);
break;
case wasm::kWasmF64:
value = graph()->NewNode(m->BitcastFloat64ToInt64(), value);
V8_FALLTHROUGH;
case wasm::kWasmI64: {
Node* upper32 = graph()->NewNode(
m->TruncateInt64ToInt32(),
Binop(wasm::kExprI64ShrU, value, Int64Constant(32)));
BuildEncodeException32BitValue(&index, upper32);
Node* lower32 = graph()->NewNode(m->TruncateInt64ToInt32(), value);
BuildEncodeException32BitValue(&index, lower32);
break;
}
default:
UNREACHABLE();
}
}
DCHECK_EQ(encoded_size, index);
return BuildCallToRuntime(Runtime::kWasmThrow, nullptr, 0);
}
void WasmGraphBuilder::BuildEncodeException32BitValue(uint32_t* index,
Node* value) {
MachineOperatorBuilder* machine = mcgraph()->machine();
Node* upper_parameters[] = {
BuildChangeUint31ToSmi(Int32Constant(*index)),
BuildChangeUint31ToSmi(
graph()->NewNode(machine->Word32Shr(), value, Int32Constant(16))),
};
BuildCallToRuntime(Runtime::kWasmExceptionSetElement, upper_parameters,
arraysize(upper_parameters));
++(*index);
Node* lower_parameters[] = {
BuildChangeUint31ToSmi(Int32Constant(*index)),
BuildChangeUint31ToSmi(graph()->NewNode(machine->Word32And(), value,
Int32Constant(0xFFFFu))),
};
BuildCallToRuntime(Runtime::kWasmExceptionSetElement, lower_parameters,
arraysize(lower_parameters));
++(*index);
}
Node* WasmGraphBuilder::BuildDecodeException32BitValue(Node* const* values,
uint32_t* index) {
MachineOperatorBuilder* machine = mcgraph()->machine();
Node* upper = BuildChangeSmiToInt32(values[*index]);
(*index)++;
upper = graph()->NewNode(machine->Word32Shl(), upper, Int32Constant(16));
Node* lower = BuildChangeSmiToInt32(values[*index]);
(*index)++;
Node* value = graph()->NewNode(machine->Word32Or(), upper, lower);
return value;
}
Node* WasmGraphBuilder::Rethrow() {
SetNeedsStackCheck();
Node* result = BuildCallToRuntime(Runtime::kWasmThrow, nullptr, 0);
return result;
}
Node* WasmGraphBuilder::ConvertExceptionTagToRuntimeId(uint32_t tag) {
// TODO(kschimpf): Handle exceptions from different modules, when they are
// linked at runtime.
return Uint32Constant(tag);
}
Node* WasmGraphBuilder::GetExceptionRuntimeId() {
SetNeedsStackCheck();
return BuildChangeSmiToInt32(
BuildCallToRuntime(Runtime::kWasmGetExceptionRuntimeId, nullptr, 0));
}
Node** WasmGraphBuilder::GetExceptionValues(
const wasm::WasmException* except_decl) {
// TODO(kschimpf): We need to move this code to the function-body-decoder.cc
// in order to build landing-pad (exception) edges in case the runtime
// call causes an exception.
// Start by getting the encoded values from the exception.
uint32_t encoded_size = GetExceptionEncodedSize(except_decl);
Node** values = Buffer(encoded_size);
for (uint32_t i = 0; i < encoded_size; ++i) {
Node* parameters[] = {BuildChangeUint31ToSmi(Uint32Constant(i))};
values[i] = BuildCallToRuntime(Runtime::kWasmExceptionGetElement,
parameters, arraysize(parameters));
}
// Now convert the leading entries to the corresponding parameter values.
uint32_t index = 0;
const wasm::WasmExceptionSig* sig = except_decl->sig;
for (size_t i = 0; i < sig->parameter_count(); ++i) {
Node* value = BuildDecodeException32BitValue(values, &index);
switch (wasm::ValueType type = sig->GetParam(i)) {
case wasm::kWasmF32: {
value = Unop(wasm::kExprF32ReinterpretI32, value);
break;
}
case wasm::kWasmI32:
break;
case wasm::kWasmF64:
case wasm::kWasmI64: {
Node* upper =
Binop(wasm::kExprI64Shl, Unop(wasm::kExprI64UConvertI32, value),
Int64Constant(32));
Node* lower = Unop(wasm::kExprI64UConvertI32,
BuildDecodeException32BitValue(values, &index));
value = Binop(wasm::kExprI64Ior, upper, lower);
if (type == wasm::kWasmF64) {
value = Unop(wasm::kExprF64ReinterpretI64, value);
}
break;
}
default:
UNREACHABLE();
}
values[i] = value;
}
DCHECK_EQ(index, encoded_size);
return values;
}
Node* WasmGraphBuilder::BuildI32DivS(Node* left, Node* right,
wasm::WasmCodePosition position) {
MachineOperatorBuilder* m = mcgraph()->machine();
ZeroCheck32(wasm::kTrapDivByZero, right, position);
Node* before = Control();
Node* denom_is_m1;
Node* denom_is_not_m1;
BranchExpectFalse(
graph()->NewNode(m->Word32Equal(), right, mcgraph()->Int32Constant(-1)),
&denom_is_m1, &denom_is_not_m1);
SetControl(denom_is_m1);
TrapIfEq32(wasm::kTrapDivUnrepresentable, left, kMinInt, position);
if (Control() != denom_is_m1) {
SetControl(graph()->NewNode(mcgraph()->common()->Merge(2), denom_is_not_m1,
Control()));
} else {
SetControl(before);
}
return graph()->NewNode(m->Int32Div(), left, right, Control());
}
Node* WasmGraphBuilder::BuildI32RemS(Node* left, Node* right,
wasm::WasmCodePosition position) {
MachineOperatorBuilder* m = mcgraph()->machine();
ZeroCheck32(wasm::kTrapRemByZero, right, position);
Diamond d(
graph(), mcgraph()->common(),
graph()->NewNode(m->Word32Equal(), right, mcgraph()->Int32Constant(-1)),
BranchHint::kFalse);
d.Chain(Control());
return d.Phi(MachineRepresentation::kWord32, mcgraph()->Int32Constant(0),
graph()->NewNode(m->Int32Mod(), left, right, d.if_false));
}
Node* WasmGraphBuilder::BuildI32DivU(Node* left, Node* right,
wasm::WasmCodePosition position) {
MachineOperatorBuilder* m = mcgraph()->machine();
return graph()->NewNode(m->Uint32Div(), left, right,
ZeroCheck32(wasm::kTrapDivByZero, right, position));
}
Node* WasmGraphBuilder::BuildI32RemU(Node* left, Node* right,
wasm::WasmCodePosition position) {
MachineOperatorBuilder* m = mcgraph()->machine();
return graph()->NewNode(m->Uint32Mod(), left, right,
ZeroCheck32(wasm::kTrapRemByZero, right, position));
}
Node* WasmGraphBuilder::BuildI32AsmjsDivS(Node* left, Node* right) {
MachineOperatorBuilder* m = mcgraph()->machine();
Int32Matcher mr(right);
if (mr.HasValue()) {
if (mr.Value() == 0) {
return mcgraph()->Int32Constant(0);
} else if (mr.Value() == -1) {
// The result is the negation of the left input.
return graph()->NewNode(m->Int32Sub(), mcgraph()->Int32Constant(0), left);
}
return graph()->NewNode(m->Int32Div(), left, right, Control());
}
// asm.js semantics return 0 on divide or mod by zero.
if (m->Int32DivIsSafe()) {
// The hardware instruction does the right thing (e.g. arm).
return graph()->NewNode(m->Int32Div(), left, right, graph()->start());
}
// Check denominator for zero.
Diamond z(
graph(), mcgraph()->common(),
graph()->NewNode(m->Word32Equal(), right, mcgraph()->Int32Constant(0)),
BranchHint::kFalse);
// Check numerator for -1. (avoid minint / -1 case).
Diamond n(
graph(), mcgraph()->common(),
graph()->NewNode(m->Word32Equal(), right, mcgraph()->Int32Constant(-1)),
BranchHint::kFalse);
Node* div = graph()->NewNode(m->Int32Div(), left, right, z.if_false);
Node* neg =
graph()->NewNode(m->Int32Sub(), mcgraph()->Int32Constant(0), left);
return n.Phi(
MachineRepresentation::kWord32, neg,
z.Phi(MachineRepresentation::kWord32, mcgraph()->Int32Constant(0), div));
}
Node* WasmGraphBuilder::BuildI32AsmjsRemS(Node* left, Node* right) {
CommonOperatorBuilder* c = mcgraph()->common();
MachineOperatorBuilder* m = mcgraph()->machine();
Node* const zero = mcgraph()->Int32Constant(0);
Int32Matcher mr(right);
if (mr.HasValue()) {
if (mr.Value() == 0 || mr.Value() == -1) {
return zero;
}
return graph()->NewNode(m->Int32Mod(), left, right, Control());
}
// General case for signed integer modulus, with optimization for (unknown)
// power of 2 right hand side.
//
// if 0 < right then
// msk = right - 1
// if right & msk != 0 then
// left % right
// else
// if left < 0 then
// -(-left & msk)
// else
// left & msk
// else
// if right < -1 then
// left % right
// else
// zero
//
// Note: We do not use the Diamond helper class here, because it really hurts
// readability with nested diamonds.
Node* const minus_one = mcgraph()->Int32Constant(-1);
const Operator* const merge_op = c->Merge(2);
const Operator* const phi_op = c->Phi(MachineRepresentation::kWord32, 2);
Node* check0 = graph()->NewNode(m->Int32LessThan(), zero, right);
Node* branch0 =
graph()->NewNode(c->Branch(BranchHint::kTrue), check0, graph()->start());
Node* if_true0 = graph()->NewNode(c->IfTrue(), branch0);
Node* true0;
{
Node* msk = graph()->NewNode(m->Int32Add(), right, minus_one);
Node* check1 = graph()->NewNode(m->Word32And(), right, msk);
Node* branch1 = graph()->NewNode(c->Branch(), check1, if_true0);
Node* if_true1 = graph()->NewNode(c->IfTrue(), branch1);
Node* true1 = graph()->NewNode(m->Int32Mod(), left, right, if_true1);
Node* if_false1 = graph()->NewNode(c->IfFalse(), branch1);
Node* false1;
{
Node* check2 = graph()->NewNode(m->Int32LessThan(), left, zero);
Node* branch2 =
graph()->NewNode(c->Branch(BranchHint::kFalse), check2, if_false1);
Node* if_true2 = graph()->NewNode(c->IfTrue(), branch2);
Node* true2 = graph()->NewNode(
m->Int32Sub(), zero,
graph()->NewNode(m->Word32And(),
graph()->NewNode(m->Int32Sub(), zero, left), msk));
Node* if_false2 = graph()->NewNode(c->IfFalse(), branch2);
Node* false2 = graph()->NewNode(m->Word32And(), left, msk);
if_false1 = graph()->NewNode(merge_op, if_true2, if_false2);
false1 = graph()->NewNode(phi_op, true2, false2, if_false1);
}
if_true0 = graph()->NewNode(merge_op, if_true1, if_false1);
true0 = graph()->NewNode(phi_op, true1, false1, if_true0);
}
Node* if_false0 = graph()->NewNode(c->IfFalse(), branch0);
Node* false0;
{
Node* check1 = graph()->NewNode(m->Int32LessThan(), right, minus_one);
Node* branch1 =
graph()->NewNode(c->Branch(BranchHint::kTrue), check1, if_false0);
Node* if_true1 = graph()->NewNode(c->IfTrue(), branch1);
Node* true1 = graph()->NewNode(m->Int32Mod(), left, right, if_true1);
Node* if_false1 = graph()->NewNode(c->IfFalse(), branch1);
Node* false1 = zero;
if_false0 = graph()->NewNode(merge_op, if_true1, if_false1);
false0 = graph()->NewNode(phi_op, true1, false1, if_false0);
}
Node* merge0 = graph()->NewNode(merge_op, if_true0, if_false0);
return graph()->NewNode(phi_op, true0, false0, merge0);
}
Node* WasmGraphBuilder::BuildI32AsmjsDivU(Node* left, Node* right) {
MachineOperatorBuilder* m = mcgraph()->machine();
// asm.js semantics return 0 on divide or mod by zero.
if (m->Uint32DivIsSafe()) {
// The hardware instruction does the right thing (e.g. arm).
return graph()->NewNode(m->Uint32Div(), left, right, graph()->start());
}
// Explicit check for x % 0.
Diamond z(
graph(), mcgraph()->common(),
graph()->NewNode(m->Word32Equal(), right, mcgraph()->Int32Constant(0)),
BranchHint::kFalse);
return z.Phi(MachineRepresentation::kWord32, mcgraph()->Int32Constant(0),
graph()->NewNode(mcgraph()->machine()->Uint32Div(), left, right,
z.if_false));
}
Node* WasmGraphBuilder::BuildI32AsmjsRemU(Node* left, Node* right) {
MachineOperatorBuilder* m = mcgraph()->machine();
// asm.js semantics return 0 on divide or mod by zero.
// Explicit check for x % 0.
Diamond z(
graph(), mcgraph()->common(),
graph()->NewNode(m->Word32Equal(), right, mcgraph()->Int32Constant(0)),
BranchHint::kFalse);
Node* rem = graph()->NewNode(mcgraph()->machine()->Uint32Mod(), left, right,
z.if_false);
return z.Phi(MachineRepresentation::kWord32, mcgraph()->Int32Constant(0),
rem);
}
Node* WasmGraphBuilder::BuildI64DivS(Node* left, Node* right,
wasm::WasmCodePosition position) {
if (mcgraph()->machine()->Is32()) {
return BuildDiv64Call(left, right, ExternalReference::wasm_int64_div(),
MachineType::Int64(), wasm::kTrapDivByZero, position);
}
ZeroCheck64(wasm::kTrapDivByZero, right, position);
Node* before = Control();
Node* denom_is_m1;
Node* denom_is_not_m1;
BranchExpectFalse(graph()->NewNode(mcgraph()->machine()->Word64Equal(), right,
mcgraph()->Int64Constant(-1)),
&denom_is_m1, &denom_is_not_m1);
SetControl(denom_is_m1);
TrapIfEq64(wasm::kTrapDivUnrepresentable, left,
std::numeric_limits<int64_t>::min(), position);
if (Control() != denom_is_m1) {
SetControl(graph()->NewNode(mcgraph()->common()->Merge(2), denom_is_not_m1,
Control()));
} else {
SetControl(before);
}
return graph()->NewNode(mcgraph()->machine()->Int64Div(), left, right,
Control());
}
Node* WasmGraphBuilder::BuildI64RemS(Node* left, Node* right,
wasm::WasmCodePosition position) {
if (mcgraph()->machine()->Is32()) {
return BuildDiv64Call(left, right, ExternalReference::wasm_int64_mod(),
MachineType::Int64(), wasm::kTrapRemByZero, position);
}
ZeroCheck64(wasm::kTrapRemByZero, right, position);
Diamond d(mcgraph()->graph(), mcgraph()->common(),
graph()->NewNode(mcgraph()->machine()->Word64Equal(), right,
mcgraph()->Int64Constant(-1)));
d.Chain(Control());
Node* rem = graph()->NewNode(mcgraph()->machine()->Int64Mod(), left, right,
d.if_false);
return d.Phi(MachineRepresentation::kWord64, mcgraph()->Int64Constant(0),
rem);
}
Node* WasmGraphBuilder::BuildI64DivU(Node* left, Node* right,
wasm::WasmCodePosition position) {
if (mcgraph()->machine()->Is32()) {
return BuildDiv64Call(left, right, ExternalReference::wasm_uint64_div(),
MachineType::Int64(), wasm::kTrapDivByZero, position);
}
return graph()->NewNode(mcgraph()->machine()->Uint64Div(), left, right,
ZeroCheck64(wasm::kTrapDivByZero, right, position));
}
Node* WasmGraphBuilder::BuildI64RemU(Node* left, Node* right,
wasm::WasmCodePosition position) {
if (mcgraph()->machine()->Is32()) {
return BuildDiv64Call(left, right, ExternalReference::wasm_uint64_mod(),
MachineType::Int64(), wasm::kTrapRemByZero, position);
}
return graph()->NewNode(mcgraph()->machine()->Uint64Mod(), left, right,
ZeroCheck64(wasm::kTrapRemByZero, right, position));
}
Node* WasmGraphBuilder::BuildDiv64Call(Node* left, Node* right,
ExternalReference ref,
MachineType result_type,
wasm::TrapReason trap_zero,
wasm::WasmCodePosition position) {
Node* stack_slot =
graph()->NewNode(mcgraph()->machine()->StackSlot(2 * sizeof(double)));
const Operator* store_op = mcgraph()->machine()->Store(
StoreRepresentation(MachineRepresentation::kWord64, kNoWriteBarrier));
SetEffect(graph()->NewNode(store_op, stack_slot, mcgraph()->Int32Constant(0),
left, Effect(), Control()));
SetEffect(graph()->NewNode(store_op, stack_slot,
mcgraph()->Int32Constant(sizeof(double)), right,
Effect(), Control()));
MachineType sig_types[] = {MachineType::Int32(), MachineType::Pointer()};
MachineSignature sig(1, 1, sig_types);
Node* function = graph()->NewNode(mcgraph()->common()->ExternalConstant(ref));
Node* call = BuildCCall(&sig, function, stack_slot);
ZeroCheck32(trap_zero, call, position);
TrapIfEq32(wasm::kTrapDivUnrepresentable, call, -1, position);
return SetEffect(graph()->NewNode(mcgraph()->machine()->Load(result_type),
stack_slot, mcgraph()->Int32Constant(0),
Effect(), Control()));
}
template <typename... Args>
Node* WasmGraphBuilder::BuildCCall(MachineSignature* sig, Node* function,
Args... args) {
DCHECK_LE(sig->return_count(), 1);
DCHECK_EQ(sizeof...(args), sig->parameter_count());
Node* const call_args[] = {function, args..., Effect(), Control()};
auto call_descriptor =
Linkage::GetSimplifiedCDescriptor(mcgraph()->zone(), sig);
const Operator* op = mcgraph()->common()->Call(call_descriptor);
return SetEffect(graph()->NewNode(op, arraysize(call_args), call_args));
}
Node* WasmGraphBuilder::BuildWasmCall(wasm::FunctionSig* sig, Node** args,
Node*** rets,
wasm::WasmCodePosition position,
Node* instance_node,
UseRetpoline use_retpoline) {
if (instance_node == nullptr) {
DCHECK_NOT_NULL(instance_node_);
instance_node = instance_node_.get();
}
SetNeedsStackCheck();
const size_t params = sig->parameter_count();
const size_t extra = 3; // instance_node, effect, and control.
const size_t count = 1 + params + extra;
// Reallocate the buffer to make space for extra inputs.
args = Realloc(args, 1 + params, count);
// Make room for the instance_node parameter at index 1, just after code.
memmove(&args[2], &args[1], params * sizeof(Node*));
args[1] = instance_node;
// Add effect and control inputs.
args[params + 2] = Effect();
args[params + 3] = Control();
auto call_descriptor =
GetWasmCallDescriptor(mcgraph()->zone(), sig, use_retpoline);
const Operator* op = mcgraph()->common()->Call(call_descriptor);
Node* call = SetEffect(graph()->NewNode(op, static_cast<int>(count), args));
DCHECK(position == wasm::kNoCodePosition || position > 0);
if (position > 0) SetSourcePosition(call, position);
size_t ret_count = sig->return_count();
if (ret_count == 0) return call; // No return value.
*rets = Buffer(ret_count);
if (ret_count == 1) {
// Only a single return value.
(*rets)[0] = call;
} else {
// Create projections for all return values.
for (size_t i = 0; i < ret_count; i++) {
(*rets)[i] = graph()->NewNode(mcgraph()->common()->Projection(i), call,
graph()->start());
}
}
return call;
}
Node* WasmGraphBuilder::BuildImportWasmCall(wasm::FunctionSig* sig, Node** args,
Node*** rets,
wasm::WasmCodePosition position,
int func_index) {
// Load the instance from the imported_instances array at a known offset.
Node* imported_instances = LOAD_INSTANCE_FIELD(ImportedFunctionInstances,
MachineType::TaggedPointer());
Node* instance_node = LOAD_FIXED_ARRAY_SLOT(imported_instances, func_index);
// Load the target from the imported_targets array at a known offset.
Node* imported_targets =
LOAD_INSTANCE_FIELD(ImportedFunctionTargets, MachineType::Pointer());
Node* target_node = SetEffect(graph()->NewNode(
mcgraph()->machine()->Load(MachineType::Pointer()), imported_targets,
mcgraph()->Int32Constant(func_index * kPointerSize), Effect(),
Control()));
args[0] = target_node;
return BuildWasmCall(sig, args, rets, position, instance_node,
untrusted_code_mitigations_ ? kRetpoline : kNoRetpoline);
}
Node* WasmGraphBuilder::BuildImportWasmCall(wasm::FunctionSig* sig, Node** args,
Node*** rets,
wasm::WasmCodePosition position,
Node* func_index) {
// Load the instance from the imported_instances array.
Node* imported_instances = LOAD_INSTANCE_FIELD(ImportedFunctionInstances,
MachineType::TaggedPointer());
// Access fixed array at {header_size - tag + func_index * kPointerSize}.
Node* imported_instances_data =
graph()->NewNode(mcgraph()->machine()->IntAdd(), imported_instances,
mcgraph()->IntPtrConstant(FixedArrayOffsetMinusTag(0)));
Node* func_index_times_pointersize = graph()->NewNode(
mcgraph()->machine()->IntMul(), Uint32ToUintptr(func_index),
mcgraph()->Int32Constant(kPointerSize));
Node* instance_node = SetEffect(
graph()->NewNode(mcgraph()->machine()->Load(MachineType::TaggedPointer()),
imported_instances_data, func_index_times_pointersize,
Effect(), Control()));
// Load the target from the imported_targets array at the offset of
// {func_index}.
Node* imported_targets =
LOAD_INSTANCE_FIELD(ImportedFunctionTargets, MachineType::Pointer());
Node* target_node = SetEffect(graph()->NewNode(
mcgraph()->machine()->Load(MachineType::Pointer()), imported_targets,
func_index_times_pointersize, Effect(), Control()));
args[0] = target_node;
return BuildWasmCall(sig, args, rets, position, instance_node,
untrusted_code_mitigations_ ? kRetpoline : kNoRetpoline);
}
Node* WasmGraphBuilder::CallDirect(uint32_t index, Node** args, Node*** rets,
wasm::WasmCodePosition position) {
DCHECK_NULL(args[0]);
wasm::FunctionSig* sig = env_->module->functions[index].sig;
if (env_ && index < env_->module->num_imported_functions) {
// Call to an imported function.
return BuildImportWasmCall(sig, args, rets, position, index);
}
// A direct call to a wasm function defined in this module.
// Just encode the function index. This will be patched at instantiation.
Address code = static_cast<Address>(index);
args[0] = mcgraph()->RelocatableIntPtrConstant(code, RelocInfo::WASM_CALL);
return BuildWasmCall(sig, args, rets, position, nullptr, kNoRetpoline);
}
Node* WasmGraphBuilder::CallIndirect(uint32_t sig_index, Node** args,
Node*** rets,
wasm::WasmCodePosition position) {
DCHECK_NOT_NULL(args[0]);
DCHECK_NOT_NULL(env_);
// Assume only one table for now.
wasm::FunctionSig* sig = env_->module->signatures[sig_index];
Node* ift_size =
LOAD_INSTANCE_FIELD(IndirectFunctionTableSize, MachineType::Uint32());
MachineOperatorBuilder* machine = mcgraph()->machine();
Node* key = args[0];
// Bounds check against the table size.
Node* in_bounds = graph()->NewNode(machine->Uint32LessThan(), key, ift_size);
TrapIfFalse(wasm::kTrapFuncInvalid, in_bounds, position);
// Mask the key to prevent SSCA.
if (untrusted_code_mitigations_) {
// mask = ((key - size) & ~key) >> 31
Node* neg_key =
graph()->NewNode(machine->Word32Xor(), key, Int32Constant(-1));
Node* masked_diff = graph()->NewNode(
machine->Word32And(),
graph()->NewNode(machine->Int32Sub(), key, ift_size), neg_key);
Node* mask =
graph()->NewNode(machine->Word32Sar(), masked_diff, Int32Constant(31));
key = graph()->NewNode(machine->Word32And(), key, mask);
}
// Load signature from the table and check.
Node* ift_sig_ids =
LOAD_INSTANCE_FIELD(IndirectFunctionTableSigIds, MachineType::Pointer());
int32_t expected_sig_id = env_->module->signature_ids[sig_index];
Node* scaled_key = Uint32ToUintptr(
graph()->NewNode(machine->Word32Shl(), key, Int32Constant(2)));
Node* loaded_sig =
SetEffect(graph()->NewNode(machine->Load(MachineType::Int32()),
ift_sig_ids, scaled_key, Effect(), Control()));
Node* sig_match = graph()->NewNode(machine->WordEqual(), loaded_sig,
Int32Constant(expected_sig_id));
TrapIfFalse(wasm::kTrapFuncSigMismatch, sig_match, position);
Node* ift_targets =
LOAD_INSTANCE_FIELD(IndirectFunctionTableTargets, MachineType::Pointer());
Node* ift_instances = LOAD_INSTANCE_FIELD(IndirectFunctionTableInstances,
MachineType::TaggedPointer());
scaled_key = graph()->NewNode(machine->Word32Shl(), key,
Int32Constant(kPointerSizeLog2));
Node* target =
SetEffect(graph()->NewNode(machine->Load(MachineType::Pointer()),
ift_targets, scaled_key, Effect(), Control()));
auto access = AccessBuilder::ForFixedArrayElement();
Node* target_instance = SetEffect(graph()->NewNode(
machine->Load(MachineType::TaggedPointer()),
graph()->NewNode(machine->IntAdd(), ift_instances, scaled_key),
Int32Constant(access.header_size - access.tag()), Effect(), Control()));
args[0] = target;
return BuildWasmCall(sig, args, rets, position, target_instance,
untrusted_code_mitigations_ ? kRetpoline : kNoRetpoline);
}
Node* WasmGraphBuilder::BuildI32Rol(Node* left, Node* right) {
// Implement Rol by Ror since TurboFan does not have Rol opcode.
// TODO(weiliang): support Word32Rol opcode in TurboFan.
Int32Matcher m(right);
if (m.HasValue()) {
return Binop(wasm::kExprI32Ror, left,
mcgraph()->Int32Constant(32 - m.Value()));
} else {
return Binop(wasm::kExprI32Ror, left,
Binop(wasm::kExprI32Sub, mcgraph()->Int32Constant(32), right));
}
}
Node* WasmGraphBuilder::BuildI64Rol(Node* left, Node* right) {
// Implement Rol by Ror since TurboFan does not have Rol opcode.
// TODO(weiliang): support Word64Rol opcode in TurboFan.
Int64Matcher m(right);
if (m.HasValue()) {
return Binop(wasm::kExprI64Ror, left,
mcgraph()->Int64Constant(64 - m.Value()));
} else {
return Binop(wasm::kExprI64Ror, left,
Binop(wasm::kExprI64Sub, mcgraph()->Int64Constant(64), right));
}
}
Node* WasmGraphBuilder::Invert(Node* node) {
return Unop(wasm::kExprI32Eqz, node);
}
bool CanCover(Node* value, IrOpcode::Value opcode) {
if (value->opcode() != opcode) return false;
bool first = true;
for (Edge const edge : value->use_edges()) {
if (NodeProperties::IsControlEdge(edge)) continue;
if (NodeProperties::IsEffectEdge(edge)) continue;
DCHECK(NodeProperties::IsValueEdge(edge));
if (!first) return false;
first = false;
}
return true;
}
Node* WasmGraphBuilder::BuildChangeInt32ToIntPtr(Node* value) {
if (mcgraph()->machine()->Is64()) {
value = graph()->NewNode(mcgraph()->machine()->ChangeInt32ToInt64(), value);
}
return value;
}
Node* WasmGraphBuilder::BuildChangeInt32ToSmi(Node* value) {
value = BuildChangeInt32ToIntPtr(value);
return graph()->NewNode(mcgraph()->machine()->WordShl(), value,
BuildSmiShiftBitsConstant());
}
Node* WasmGraphBuilder::BuildChangeUint31ToSmi(Node* value) {
return graph()->NewNode(mcgraph()->machine()->WordShl(),
Uint32ToUintptr(value), BuildSmiShiftBitsConstant());
}
Node* WasmGraphBuilder::BuildSmiShiftBitsConstant() {
return mcgraph()->IntPtrConstant(kSmiShiftSize + kSmiTagSize);
}
Node* WasmGraphBuilder::BuildChangeSmiToInt32(Node* value) {
value = graph()->NewNode(mcgraph()->machine()->WordSar(), value,
BuildSmiShiftBitsConstant());
if (mcgraph()->machine()->Is64()) {
value =
graph()->NewNode(mcgraph()->machine()->TruncateInt64ToInt32(), value);
}
return value;
}
void WasmGraphBuilder::InitInstanceCache(
WasmInstanceCacheNodes* instance_cache) {
DCHECK_NOT_NULL(instance_node_);
// Load the memory start.
instance_cache->mem_start = SetEffect(graph()->NewNode(
mcgraph()->machine()->Load(MachineType::UintPtr()), instance_node_.get(),
mcgraph()->Int32Constant(WASM_INSTANCE_OBJECT_OFFSET(MemoryStart)),
Effect(), Control()));
// Load the memory size.
instance_cache->mem_size = SetEffect(graph()->NewNode(
mcgraph()->machine()->Load(MachineType::UintPtr()), instance_node_.get(),
mcgraph()->Int32Constant(WASM_INSTANCE_OBJECT_OFFSET(MemorySize)),
Effect(), Control()));
if (untrusted_code_mitigations_) {
// Load the memory mask.
instance_cache->mem_mask = SetEffect(graph()->NewNode(
mcgraph()->machine()->Load(MachineType::UintPtr()),
instance_node_.get(),
mcgraph()->Int32Constant(WASM_INSTANCE_OBJECT_OFFSET(MemoryMask)),
Effect(), Control()));
} else {
// Explicitly set to nullptr to ensure a SEGV when we try to use it.
instance_cache->mem_mask = nullptr;
}
}
void WasmGraphBuilder::PrepareInstanceCacheForLoop(
WasmInstanceCacheNodes* instance_cache, Node* control) {
#define INTRODUCE_PHI(field, rep) \
instance_cache->field = graph()->NewNode(mcgraph()->common()->Phi(rep, 1), \
instance_cache->field, control);
INTRODUCE_PHI(mem_start, MachineType::PointerRepresentation());
INTRODUCE_PHI(mem_size, MachineRepresentation::kWord32);
if (untrusted_code_mitigations_) {
INTRODUCE_PHI(mem_mask, MachineRepresentation::kWord32);
}
#undef INTRODUCE_PHI
}
void WasmGraphBuilder::NewInstanceCacheMerge(WasmInstanceCacheNodes* to,
WasmInstanceCacheNodes* from,
Node* merge) {
#define INTRODUCE_PHI(field, rep) \
if (to->field != from->field) { \
Node* vals[] = {to->field, from->field, merge}; \
to->field = graph()->NewNode(mcgraph()->common()->Phi(rep, 2), 3, vals); \
}
INTRODUCE_PHI(mem_start, MachineType::PointerRepresentation());
INTRODUCE_PHI(mem_size, MachineRepresentation::kWord32);
if (untrusted_code_mitigations_) {
INTRODUCE_PHI(mem_mask, MachineRepresentation::kWord32);
}
#undef INTRODUCE_PHI
}
void WasmGraphBuilder::MergeInstanceCacheInto(WasmInstanceCacheNodes* to,
WasmInstanceCacheNodes* from,
Node* merge) {
to->mem_size = CreateOrMergeIntoPhi(MachineType::PointerRepresentation(),
merge, to->mem_size, from->mem_size);
to->mem_start = CreateOrMergeIntoPhi(MachineType::PointerRepresentation(),
merge, to->mem_start, from->mem_start);
if (untrusted_code_mitigations_) {
to->mem_mask = CreateOrMergeIntoPhi(MachineType::PointerRepresentation(),
merge, to->mem_mask, from->mem_mask);
}
}
Node* WasmGraphBuilder::CreateOrMergeIntoPhi(MachineRepresentation rep,
Node* merge, Node* tnode,
Node* fnode) {
if (IsPhiWithMerge(tnode, merge)) {
AppendToPhi(tnode, fnode);
} else if (tnode != fnode) {
uint32_t count = merge->InputCount();
// + 1 for the merge node.
Node** vals = Buffer(count + 1);
for (uint32_t j = 0; j < count - 1; j++) vals[j] = tnode;
vals[count - 1] = fnode;
vals[count] = merge;
return graph()->NewNode(mcgraph()->common()->Phi(rep, count), count + 1,
vals);
}
return tnode;
}
Node* WasmGraphBuilder::CreateOrMergeIntoEffectPhi(Node* merge, Node* tnode,
Node* fnode) {
if (IsPhiWithMerge(tnode, merge)) {
AppendToPhi(tnode, fnode);
} else if (tnode != fnode) {
uint32_t count = merge->InputCount();
Node** effects = Buffer(count);
for (uint32_t j = 0; j < count - 1; j++) {
effects[j] = tnode;
}
effects[count - 1] = fnode;
tnode = EffectPhi(count, effects, merge);
}
return tnode;
}
void WasmGraphBuilder::GetGlobalBaseAndOffset(MachineType mem_type,
const wasm::WasmGlobal& global,
Node** base_node,
Node** offset_node) {
DCHECK_NOT_NULL(instance_node_);
if (global.mutability && global.imported) {
if (imported_mutable_globals_ == nullptr) {
// Load imported_mutable_globals_ from the instance object at runtime.
imported_mutable_globals_ = graph()->NewNode(
mcgraph()->machine()->Load(MachineType::UintPtr()),
instance_node_.get(),
mcgraph()->Int32Constant(
WASM_INSTANCE_OBJECT_OFFSET(ImportedMutableGlobals)),
graph()->start(), graph()->start());
}
*base_node = SetEffect(graph()->NewNode(
mcgraph()->machine()->Load(MachineType::UintPtr()),
imported_mutable_globals_.get(),
mcgraph()->Int32Constant(global.index * sizeof(Address)), Effect(),
Control()));
*offset_node = mcgraph()->Int32Constant(0);
} else {
if (globals_start_ == nullptr) {
// Load globals_start from the instance object at runtime.
// TODO(wasm): we currently generate only one load of the {globals_start}
// start per graph, which means it can be placed anywhere by the
// scheduler. This is legal because the globals_start should never change.
// However, in some cases (e.g. if the instance object is already in a
// register), it is slightly more efficient to reload this value from the
// instance object. Since this depends on register allocation, it is not
// possible to express in the graph, and would essentially constitute a
// "mem2reg" optimization in TurboFan.
globals_start_ = graph()->NewNode(
mcgraph()->machine()->Load(MachineType::UintPtr()),
instance_node_.get(),
mcgraph()->Int32Constant(WASM_INSTANCE_OBJECT_OFFSET(GlobalsStart)),
graph()->start(), graph()->start());
}
*base_node = globals_start_.get();
*offset_node = mcgraph()->Int32Constant(global.offset);
if (mem_type == MachineType::Simd128() && global.offset != 0) {
// TODO(titzer,bbudge): code generation for SIMD memory offsets is broken.
*base_node = graph()->NewNode(mcgraph()->machine()->IntAdd(), *base_node,
*offset_node);
*offset_node = mcgraph()->Int32Constant(0);
}
}
}
Node* WasmGraphBuilder::MemBuffer(uint32_t offset) {
DCHECK_NOT_NULL(instance_cache_);
Node* mem_start = instance_cache_->mem_start;
DCHECK_NOT_NULL(mem_start);
if (offset == 0) return mem_start;
return graph()->NewNode(mcgraph()->machine()->IntAdd(), mem_start,
mcgraph()->IntPtrConstant(offset));
}
Node* WasmGraphBuilder::CurrentMemoryPages() {
// CurrentMemoryPages can not be called from asm.js.
DCHECK_EQ(wasm::kWasmOrigin, env_->module->origin);
DCHECK_NOT_NULL(instance_cache_);
Node* mem_size = instance_cache_->mem_size;
DCHECK_NOT_NULL(mem_size);
Node* result =
graph()->NewNode(mcgraph()->machine()->WordShr(), mem_size,
mcgraph()->Int32Constant(wasm::kWasmPageSizeLog2));
if (mcgraph()->machine()->Is64()) {
result =
graph()->NewNode(mcgraph()->machine()->TruncateInt64ToInt32(), result);
}
return result;
}
// Only call this function for code which is not reused across instantiations,
// as we do not patch the embedded js_context.
Node* WasmGraphBuilder::BuildCallToRuntimeWithContext(Runtime::FunctionId f,
Node* js_context,
Node** parameters,
int parameter_count) {
const Runtime::Function* fun = Runtime::FunctionForId(f);
auto call_descriptor = Linkage::GetRuntimeCallDescriptor(
mcgraph()->zone(), f, fun->nargs, Operator::kNoProperties,
CallDescriptor::kNoFlags);
// The CEntryStub is loaded from the instance_node so that generated code is
// Isolate independent. At the moment this is only done for CEntryStub(1).
DCHECK_EQ(1, fun->result_size);
Node* centry_stub =
LOAD_INSTANCE_FIELD(CEntryStub, MachineType::TaggedPointer());
// At the moment we only allow 4 parameters. If more parameters are needed,
// increase this constant accordingly.
static const int kMaxParams = 4;
DCHECK_GE(kMaxParams, parameter_count);
Node* inputs[kMaxParams + 6];
int count = 0;
inputs[count++] = centry_stub;
for (int i = 0; i < parameter_count; i++) {
inputs[count++] = parameters[i];
}
inputs[count++] =
mcgraph()->ExternalConstant(ExternalReference::Create(f)); // ref
inputs[count++] = mcgraph()->Int32Constant(fun->nargs); // arity
inputs[count++] = js_context; // js_context
inputs[count++] = Effect();
inputs[count++] = Control();
return SetEffect(mcgraph()->graph()->NewNode(
mcgraph()->common()->Call(call_descriptor), count, inputs));
}
Node* WasmGraphBuilder::BuildCallToRuntime(Runtime::FunctionId f,
Node** parameters,
int parameter_count) {
return BuildCallToRuntimeWithContext(f, NoContextConstant(), parameters,
parameter_count);
}
Node* WasmGraphBuilder::GetGlobal(uint32_t index) {
MachineType mem_type =
wasm::ValueTypes::MachineTypeFor(env_->module->globals[index].type);
Node* base = nullptr;
Node* offset = nullptr;
GetGlobalBaseAndOffset(mem_type, env_->module->globals[index], &base,
&offset);
Node* load = SetEffect(graph()->NewNode(mcgraph()->machine()->Load(mem_type),
base, offset, Effect(), Control()));
#if defined(V8_TARGET_BIG_ENDIAN)
load = BuildChangeEndiannessLoad(load, mem_type,
env_->module->globals[index].type);
#endif
return load;
}
Node* WasmGraphBuilder::SetGlobal(uint32_t index, Node* val) {
MachineType mem_type =
wasm::ValueTypes::MachineTypeFor(env_->module->globals[index].type);
Node* base = nullptr;
Node* offset = nullptr;
GetGlobalBaseAndOffset(mem_type, env_->module->globals[index], &base,
&offset);
const Operator* op = mcgraph()->machine()->Store(
StoreRepresentation(mem_type.representation(), kNoWriteBarrier));
#if defined(V8_TARGET_BIG_ENDIAN)
val = BuildChangeEndiannessStore(val, mem_type.representation(),
env_->module->globals[index].type);
#endif
return SetEffect(
graph()->NewNode(op, base, offset, val, Effect(), Control()));
}
Node* WasmGraphBuilder::CheckBoundsAndAlignment(
uint8_t access_size, Node* index, uint32_t offset,
wasm::WasmCodePosition position) {
// Atomic operations access the memory, need to be bound checked till
// TrapHandlers are enabled on atomic operations
index =
BoundsCheckMem(access_size, index, offset, position, kNeedsBoundsCheck);
Node* effective_address =
graph()->NewNode(mcgraph()->machine()->IntAdd(), MemBuffer(offset),
Uint32ToUintptr(index));
// Unlike regular memory accesses, unaligned memory accesses for atomic
// operations should trap
// Access sizes are in powers of two, calculate mod without using division
Node* cond =
graph()->NewNode(mcgraph()->machine()->WordAnd(), effective_address,
IntPtrConstant(access_size - 1));
TrapIfFalse(wasm::kTrapUnalignedAccess,
graph()->NewNode(mcgraph()->machine()->Word32Equal(), cond,
mcgraph()->Int32Constant(0)),
position);
return index;
}
Node* WasmGraphBuilder::BoundsCheckMem(uint8_t access_size, Node* index,
uint32_t offset,
wasm::WasmCodePosition position,
EnforceBoundsCheck enforce_check) {
DCHECK_LE(1, access_size);
index = Uint32ToUintptr(index);
if (FLAG_wasm_no_bounds_checks) return index;
if (use_trap_handler() && enforce_check == kCanOmitBoundsCheck) {
return index;
}
const bool statically_oob = access_size > env_->max_memory_size ||
offset > env_->max_memory_size - access_size;
if (statically_oob) {
// The access will be out of bounds, even for the largest memory.
TrapIfEq32(wasm::kTrapMemOutOfBounds, Int32Constant(0), 0, position);
return mcgraph()->IntPtrConstant(0);
}
uint64_t end_offset = uint64_t{offset} + access_size - 1u;
Node* end_offset_node = IntPtrConstant(end_offset);
// The accessed memory is [index + offset, index + end_offset].
// Check that the last read byte (at {index + end_offset}) is in bounds.
// 1) Check that {end_offset < mem_size}. This also ensures that we can safely
// compute {effective_size} as {mem_size - end_offset)}.
// {effective_size} is >= 1 if condition 1) holds.
// 2) Check that {index + end_offset < mem_size} by
// - computing {effective_size} as {mem_size - end_offset} and
// - checking that {index < effective_size}.
auto m = mcgraph()->machine();
Node* mem_size = instance_cache_->mem_size;
if (end_offset >= env_->min_memory_size) {
// The end offset is larger than the smallest memory.
// Dynamically check the end offset against the dynamic memory size.
Node* cond = graph()->NewNode(m->UintLessThan(), end_offset_node, mem_size);
TrapIfFalse(wasm::kTrapMemOutOfBounds, cond, position);
} else {
// The end offset is smaller than the smallest memory, so only one check is
// required. Check to see if the index is also a constant.
UintPtrMatcher match(index);
if (match.HasValue()) {
uintptr_t index_val = match.Value();
if (index_val < env_->min_memory_size - end_offset) {
// The input index is a constant and everything is statically within
// bounds of the smallest possible memory.
return index;
}
}
}
// This produces a positive number, since {end_offset < min_size <= mem_size}.
Node* effective_size =
graph()->NewNode(m->IntSub(), mem_size, end_offset_node);
// Introduce the actual bounds check.
Node* cond = graph()->NewNode(m->UintLessThan(), index, effective_size);
TrapIfFalse(wasm::kTrapMemOutOfBounds, cond, position);
if (untrusted_code_mitigations_) {
// In the fallthrough case, condition the index with the memory mask.
Node* mem_mask = instance_cache_->mem_mask;
DCHECK_NOT_NULL(mem_mask);
index = graph()->NewNode(m->WordAnd(), index, mem_mask);
}
return index;
}
const Operator* WasmGraphBuilder::GetSafeLoadOperator(int offset,
wasm::ValueType type) {
int alignment = offset % (wasm::ValueTypes::ElementSizeInBytes(type));
MachineType mach_type = wasm::ValueTypes::MachineTypeFor(type);
if (alignment == 0 || mcgraph()->machine()->UnalignedLoadSupported(
wasm::ValueTypes::MachineRepresentationFor(type))) {
return mcgraph()->machine()->Load(mach_type);
}
return mcgraph()->machine()->UnalignedLoad(mach_type);
}
const Operator* WasmGraphBuilder::GetSafeStoreOperator(int offset,
wasm::ValueType type) {
int alignment = offset % (wasm::ValueTypes::ElementSizeInBytes(type));
MachineRepresentation rep = wasm::ValueTypes::MachineRepresentationFor(type);
if (alignment == 0 || mcgraph()->machine()->UnalignedStoreSupported(rep)) {
StoreRepresentation store_rep(rep, WriteBarrierKind::kNoWriteBarrier);
return mcgraph()->machine()->Store(store_rep);
}
UnalignedStoreRepresentation store_rep(rep);
return mcgraph()->machine()->UnalignedStore(store_rep);
}
Node* WasmGraphBuilder::TraceMemoryOperation(bool is_store,
MachineRepresentation rep,
Node* index, uint32_t offset,
wasm::WasmCodePosition position) {
int kAlign = 4; // Ensure that the LSB is 0, such that this looks like a Smi.
Node* info = graph()->NewNode(
mcgraph()->machine()->StackSlot(sizeof(wasm::MemoryTracingInfo), kAlign));
Node* address = graph()->NewNode(mcgraph()->machine()->Int32Add(),
Int32Constant(offset), index);
auto store = [&](int offset, MachineRepresentation rep, Node* data) {
SetEffect(graph()->NewNode(
mcgraph()->machine()->Store(StoreRepresentation(rep, kNoWriteBarrier)),
info, mcgraph()->Int32Constant(offset), data, Effect(), Control()));
};
// Store address, is_store, and mem_rep.
store(offsetof(wasm::MemoryTracingInfo, address),
MachineRepresentation::kWord32, address);
store(offsetof(wasm::MemoryTracingInfo, is_store),
MachineRepresentation::kWord8,
mcgraph()->Int32Constant(is_store ? 1 : 0));
store(offsetof(wasm::MemoryTracingInfo, mem_rep),
MachineRepresentation::kWord8,
mcgraph()->Int32Constant(static_cast<int>(rep)));
Node* call = BuildCallToRuntime(Runtime::kWasmTraceMemory, &info, 1);
SetSourcePosition(call, position);
return call;
}
Node* WasmGraphBuilder::LoadMem(wasm::ValueType type, MachineType memtype,
Node* index, uint32_t offset,
uint32_t alignment,
wasm::WasmCodePosition position) {
Node* load;
// Wasm semantics throw on OOB. Introduce explicit bounds check and
// conditioning when not using the trap handler.
index = BoundsCheckMem(wasm::ValueTypes::MemSize(memtype), index, offset,
position, kCanOmitBoundsCheck);
if (memtype.representation() == MachineRepresentation::kWord8 ||
mcgraph()->machine()->UnalignedLoadSupported(memtype.representation())) {
if (use_trap_handler()) {
load = graph()->NewNode(mcgraph()->machine()->ProtectedLoad(memtype),
MemBuffer(offset), index, Effect(), Control());
SetSourcePosition(load, position);
} else {
load = graph()->NewNode(mcgraph()->machine()->Load(memtype),
MemBuffer(offset), index, Effect(), Control());
}
} else {
// TODO(eholk): Support unaligned loads with trap handlers.
DCHECK(!use_trap_handler());
load = graph()->NewNode(mcgraph()->machine()->UnalignedLoad(memtype),
MemBuffer(offset), index, Effect(), Control());
}
SetEffect(load);
#if defined(V8_TARGET_BIG_ENDIAN)
load = BuildChangeEndiannessLoad(load, memtype, type);
#endif
if (type == wasm::kWasmI64 &&
ElementSizeInBytes(memtype.representation()) < 8) {
// TODO(titzer): TF zeroes the upper bits of 64-bit loads for subword sizes.
if (memtype.IsSigned()) {
// sign extend
load = graph()->NewNode(mcgraph()->machine()->ChangeInt32ToInt64(), load);
} else {
// zero extend
load =
graph()->NewNode(mcgraph()->machine()->ChangeUint32ToUint64(), load);
}
}
if (FLAG_wasm_trace_memory) {
TraceMemoryOperation(false, memtype.representation(), index, offset,
position);
}
return load;
}
Node* WasmGraphBuilder::StoreMem(MachineRepresentation mem_rep, Node* index,
uint32_t offset, uint32_t alignment, Node* val,
wasm::WasmCodePosition position,
wasm::ValueType type) {
Node* store;
index = BoundsCheckMem(i::ElementSizeInBytes(mem_rep), index, offset,
position, kCanOmitBoundsCheck);
#if defined(V8_TARGET_BIG_ENDIAN)
val = BuildChangeEndiannessStore(val, mem_rep, type);
#endif
if (mem_rep == MachineRepresentation::kWord8 ||
mcgraph()->machine()->UnalignedStoreSupported(mem_rep)) {
if (use_trap_handler()) {
store =
graph()->NewNode(mcgraph()->machine()->ProtectedStore(mem_rep),
MemBuffer(offset), index, val, Effect(), Control());
SetSourcePosition(store, position);
} else {
StoreRepresentation rep(mem_rep, kNoWriteBarrier);
store =
graph()->NewNode(mcgraph()->machine()->Store(rep), MemBuffer(offset),
index, val, Effect(), Control());
}
} else {
// TODO(eholk): Support unaligned stores with trap handlers.
DCHECK(!use_trap_handler());
UnalignedStoreRepresentation rep(mem_rep);
store =
graph()->NewNode(mcgraph()->machine()->UnalignedStore(rep),
MemBuffer(offset), index, val, Effect(), Control());
}
SetEffect(store);
if (FLAG_wasm_trace_memory) {
TraceMemoryOperation(true, mem_rep, index, offset, position);
}
return store;
}
namespace {
Node* GetAsmJsOOBValue(MachineRepresentation rep, MachineGraph* mcgraph) {
switch (rep) {
case MachineRepresentation::kWord8:
case MachineRepresentation::kWord16:
case MachineRepresentation::kWord32:
return mcgraph->Int32Constant(0);
case MachineRepresentation::kWord64:
return mcgraph->Int64Constant(0);
case MachineRepresentation::kFloat32:
return mcgraph->Float32Constant(std::numeric_limits<float>::quiet_NaN());
case MachineRepresentation::kFloat64:
return mcgraph->Float64Constant(std::numeric_limits<double>::quiet_NaN());
default:
UNREACHABLE();
}
}
} // namespace
Node* WasmGraphBuilder::BuildAsmjsLoadMem(MachineType type, Node* index) {
DCHECK_NOT_NULL(instance_cache_);
Node* mem_start = instance_cache_->mem_start;
Node* mem_size = instance_cache_->mem_size;
DCHECK_NOT_NULL(mem_start);
DCHECK_NOT_NULL(mem_size);
// Asm.js semantics are defined in terms of typed arrays, hence OOB
// reads return {undefined} coerced to the result type (0 for integers, NaN
// for float and double).
// Note that we check against the memory size ignoring the size of the
// stored value, which is conservative if misaligned. Technically, asm.js
// should never have misaligned accesses.
index = Uint32ToUintptr(index);
Diamond bounds_check(
graph(), mcgraph()->common(),
graph()->NewNode(mcgraph()->machine()->UintLessThan(), index, mem_size),
BranchHint::kTrue);
bounds_check.Chain(Control());
if (untrusted_code_mitigations_) {
// Condition the index with the memory mask.
Node* mem_mask = instance_cache_->mem_mask;
DCHECK_NOT_NULL(mem_mask);
index = graph()->NewNode(mcgraph()->machine()->WordAnd(), index, mem_mask);
}
Node* load = graph()->NewNode(mcgraph()->machine()->Load(type), mem_start,
index, Effect(), bounds_check.if_true);
SetEffect(bounds_check.EffectPhi(load, Effect()));
SetControl(bounds_check.merge);
return bounds_check.Phi(type.representation(), load,
GetAsmJsOOBValue(type.representation(), mcgraph()));
}
Node* WasmGraphBuilder::Uint32ToUintptr(Node* node) {
if (mcgraph()->machine()->Is32()) return node;
// Fold instances of ChangeUint32ToUint64(IntConstant) directly.
Uint32Matcher matcher(node);
if (matcher.HasValue()) {
uintptr_t value = matcher.Value();
return mcgraph()->IntPtrConstant(bit_cast<intptr_t>(value));
}
return graph()->NewNode(mcgraph()->machine()->ChangeUint32ToUint64(), node);
}
Node* WasmGraphBuilder::BuildAsmjsStoreMem(MachineType type, Node* index,
Node* val) {
DCHECK_NOT_NULL(instance_cache_);
Node* mem_start = instance_cache_->mem_start;
Node* mem_size = instance_cache_->mem_size;
DCHECK_NOT_NULL(mem_start);
DCHECK_NOT_NULL(mem_size);
// Asm.js semantics are to ignore OOB writes.
// Note that we check against the memory size ignoring the size of the
// stored value, which is conservative if misaligned. Technically, asm.js
// should never have misaligned accesses.
Diamond bounds_check(
graph(), mcgraph()->common(),
graph()->NewNode(mcgraph()->machine()->Uint32LessThan(), index, mem_size),
BranchHint::kTrue);
bounds_check.Chain(Control());
if (untrusted_code_mitigations_) {
// Condition the index with the memory mask.
Node* mem_mask = instance_cache_->mem_mask;
DCHECK_NOT_NULL(mem_mask);
index =
graph()->NewNode(mcgraph()->machine()->Word32And(), index, mem_mask);
}
index = Uint32ToUintptr(index);
const Operator* store_op = mcgraph()->machine()->Store(StoreRepresentation(
type.representation(), WriteBarrierKind::kNoWriteBarrier));
Node* store = graph()->NewNode(store_op, mem_start, index, val, Effect(),
bounds_check.if_true);
SetEffect(bounds_check.EffectPhi(store, Effect()));
SetControl(bounds_check.merge);
return val;
}
void WasmGraphBuilder::PrintDebugName(Node* node) {
PrintF("#%d:%s", node->id(), node->op()->mnemonic());
}
Graph* WasmGraphBuilder::graph() { return mcgraph()->graph(); }
namespace {
Signature<MachineRepresentation>* CreateMachineSignature(
Zone* zone, wasm::FunctionSig* sig) {
Signature<MachineRepresentation>::Builder builder(zone, sig->return_count(),
sig->parameter_count());
for (auto ret : sig->returns()) {
builder.AddReturn(wasm::ValueTypes::MachineRepresentationFor(ret));
}
for (auto param : sig->parameters()) {
builder.AddParam(wasm::ValueTypes::MachineRepresentationFor(param));
}
return builder.Build();
}
} // namespace
void WasmGraphBuilder::LowerInt64() {
if (mcgraph()->machine()->Is64()) return;
Int64Lowering r(mcgraph()->graph(), mcgraph()->machine(), mcgraph()->common(),
mcgraph()->zone(),
CreateMachineSignature(mcgraph()->zone(), sig_));
r.LowerGraph();
}
void WasmGraphBuilder::SimdScalarLoweringForTesting() {
SimdScalarLowering(mcgraph(), CreateMachineSignature(mcgraph()->zone(), sig_))
.LowerGraph();
}
void WasmGraphBuilder::SetSourcePosition(Node* node,
wasm::WasmCodePosition position) {
DCHECK_NE(position, wasm::kNoCodePosition);
if (source_position_table_)
source_position_table_->SetSourcePosition(node, SourcePosition(position));
}
Node* WasmGraphBuilder::S128Zero() {
has_simd_ = true;
return graph()->NewNode(mcgraph()->machine()->S128Zero());
}
Node* WasmGraphBuilder::SimdOp(wasm::WasmOpcode opcode, Node* const* inputs) {
has_simd_ = true;
switch (opcode) {
case wasm::kExprF32x4Splat:
return graph()->NewNode(mcgraph()->machine()->F32x4Splat(), inputs[0]);
case wasm::kExprF32x4SConvertI32x4:
return graph()->NewNode(mcgraph()->machine()->F32x4SConvertI32x4(),
inputs[0]);
case wasm::kExprF32x4UConvertI32x4:
return graph()->NewNode(mcgraph()->machine()->F32x4UConvertI32x4(),
inputs[0]);
case wasm::kExprF32x4Abs:
return graph()->NewNode(mcgraph()->machine()->F32x4Abs(), inputs[0]);
case wasm::kExprF32x4Neg:
return graph()->NewNode(mcgraph()->machine()->F32x4Neg(), inputs[0]);
case wasm::kExprF32x4RecipApprox:
return graph()->NewNode(mcgraph()->machine()->F32x4RecipApprox(),
inputs[0]);
case wasm::kExprF32x4RecipSqrtApprox:
return graph()->NewNode(mcgraph()->machine()->F32x4RecipSqrtApprox(),
inputs[0]);
case wasm::kExprF32x4Add:
return graph()->NewNode(mcgraph()->machine()->F32x4Add(), inputs[0],
inputs[1]);
case wasm::kExprF32x4AddHoriz:
return graph()->NewNode(mcgraph()->machine()->F32x4AddHoriz(), inputs[0],
inputs[1]);
case wasm::kExprF32x4Sub:
return graph()->NewNode(mcgraph()->machine()->F32x4Sub(), inputs[0],
inputs[1]);
case wasm::kExprF32x4Mul:
return graph()->NewNode(mcgraph()->machine()->F32x4Mul(), inputs[0],
inputs[1]);
case wasm::kExprF32x4Min:
return graph()->NewNode(mcgraph()->machine()->F32x4Min(), inputs[0],
inputs[1]);
case wasm::kExprF32x4Max:
return graph()->NewNode(mcgraph()->machine()->F32x4Max(), inputs[0],
inputs[1]);
case wasm::kExprF32x4Eq:
return graph()->NewNode(mcgraph()->machine()->F32x4Eq(), inputs[0],
inputs[1]);
case wasm::kExprF32x4Ne:
return graph()->NewNode(mcgraph()->machine()->F32x4Ne(), inputs[0],
inputs[1]);
case wasm::kExprF32x4Lt:
return graph()->NewNode(mcgraph()->machine()->F32x4Lt(), inputs[0],
inputs[1]);
case wasm::kExprF32x4Le:
return graph()->NewNode(mcgraph()->machine()->F32x4Le(), inputs[0],
inputs[1]);
case wasm::kExprF32x4Gt:
return graph()->NewNode(mcgraph()->machine()->F32x4Lt(), inputs[1],
inputs[0]);
case wasm::kExprF32x4Ge:
return graph()->NewNode(mcgraph()->machine()->F32x4Le(), inputs[1],
inputs[0]);
case wasm::kExprI32x4Splat:
return graph()->NewNode(mcgraph()->machine()->I32x4Splat(), inputs[0]);
case wasm::kExprI32x4SConvertF32x4:
return graph()->NewNode(mcgraph()->machine()->I32x4SConvertF32x4(),
inputs[0]);
case wasm::kExprI32x4UConvertF32x4:
return graph()->NewNode(mcgraph()->machine()->I32x4UConvertF32x4(),
inputs[0]);
case wasm::kExprI32x4SConvertI16x8Low:
return graph()->NewNode(mcgraph()->machine()->I32x4SConvertI16x8Low(),
inputs[0]);
case wasm::kExprI32x4SConvertI16x8High:
return graph()->NewNode(mcgraph()->machine()->I32x4SConvertI16x8High(),
inputs[0]);
case wasm::kExprI32x4Neg:
return graph()->NewNode(mcgraph()->machine()->I32x4Neg(), inputs[0]);
case wasm::kExprI32x4Add:
return graph()->NewNode(mcgraph()->machine()->I32x4Add(), inputs[0],
inputs[1]);
case wasm::kExprI32x4AddHoriz:
return graph()->NewNode(mcgraph()->machine()->I32x4AddHoriz(), inputs[0],
inputs[1]);
case wasm::kExprI32x4Sub:
return graph()->NewNode(mcgraph()->machine()->I32x4Sub(), inputs[0],
inputs[1]);
case wasm::kExprI32x4Mul:
return graph()->NewNode(mcgraph()->machine()->I32x4Mul(), inputs[0],
inputs[1]);
case wasm::kExprI32x4MinS:
return graph()->NewNode(mcgraph()->machine()->I32x4MinS(), inputs[0],
inputs[1]);
case wasm::kExprI32x4MaxS:
return graph()->NewNode(mcgraph()->machine()->I32x4MaxS(), inputs[0],
inputs[1]);
case wasm::kExprI32x4Eq:
return graph()->NewNode(mcgraph()->machine()->I32x4Eq(), inputs[0],
inputs[1]);
case wasm::kExprI32x4Ne:
return graph()->NewNode(mcgraph()->machine()->I32x4Ne(), inputs[0],
inputs[1]);
case wasm::kExprI32x4LtS:
return graph()->NewNode(mcgraph()->machine()->I32x4GtS(), inputs[1],
inputs[0]);
case wasm::kExprI32x4LeS:
return graph()->NewNode(mcgraph()->machine()->I32x4GeS(), inputs[1],
inputs[0]);
case wasm::kExprI32x4GtS:
return graph()->NewNode(mcgraph()->machine()->I32x4GtS(), inputs[0],
inputs[1]);
case wasm::kExprI32x4GeS:
return graph()->NewNode(mcgraph()->machine()->I32x4GeS(), inputs[0],
inputs[1]);
case wasm::kExprI32x4UConvertI16x8Low:
return graph()->NewNode(mcgraph()->machine()->I32x4UConvertI16x8Low(),
inputs[0]);
case wasm::kExprI32x4UConvertI16x8High:
return graph()->NewNode(mcgraph()->machine()->I32x4UConvertI16x8High(),
inputs[0]);
case wasm::kExprI32x4MinU:
return graph()->NewNode(mcgraph()->machine()->I32x4MinU(), inputs[0],
inputs[1]);
case wasm::kExprI32x4MaxU:
return graph()->NewNode(mcgraph()->machine()->I32x4MaxU(), inputs[0],
inputs[1]);
case wasm::kExprI32x4LtU:
return graph()->NewNode(mcgraph()->machine()->I32x4GtU(), inputs[1],
inputs[0]);
case wasm::kExprI32x4LeU:
return graph()->NewNode(mcgraph()->machine()->I32x4GeU(), inputs[1],
inputs[0]);
case wasm::kExprI32x4GtU:
return graph()->NewNode(mcgraph()->machine()->I32x4GtU(), inputs[0],
inputs[1]);
case wasm::kExprI32x4GeU:
return graph()->NewNode(mcgraph()->machine()->I32x4GeU(), inputs[0],
inputs[1]);
case wasm::kExprI16x8Splat:
return graph()->NewNode(mcgraph()->machine()->I16x8Splat(), inputs[0]);
case wasm::kExprI16x8SConvertI8x16Low:
return graph()->NewNode(mcgraph()->machine()->I16x8SConvertI8x16Low(),
inputs[0]);
case wasm::kExprI16x8SConvertI8x16High:
return graph()->NewNode(mcgraph()->machine()->I16x8SConvertI8x16High(),
inputs[0]);
case wasm::kExprI16x8Neg:
return graph()->NewNode(mcgraph()->machine()->I16x8Neg(), inputs[0]);
case wasm::kExprI16x8SConvertI32x4:
return graph()->NewNode(mcgraph()->machine()->I16x8SConvertI32x4(),
inputs[0], inputs[1]);
case wasm::kExprI16x8Add:
return graph()->NewNode(mcgraph()->machine()->I16x8Add(), inputs[0],
inputs[1]);
case wasm::kExprI16x8AddSaturateS:
return graph()->NewNode(mcgraph()->machine()->I16x8AddSaturateS(),
inputs[0], inputs[1]);
case wasm::kExprI16x8AddHoriz:
return graph()->NewNode(mcgraph()->machine()->I16x8AddHoriz(), inputs[0],
inputs[1]);
case wasm::kExprI16x8Sub:
return graph()->NewNode(mcgraph()->machine()->I16x8Sub(), inputs[0],
inputs[1]);
case wasm::kExprI16x8SubSaturateS:
return graph()->NewNode(mcgraph()->machine()->I16x8SubSaturateS(),
inputs[0], inputs[1]);
case wasm::kExprI16x8Mul:
return graph()->NewNode(mcgraph()->machine()->I16x8Mul(), inputs[0],
inputs[1]);
case wasm::kExprI16x8MinS:
return graph()->NewNode(mcgraph()->machine()->I16x8MinS(), inputs[0],
inputs[1]);
case wasm::kExprI16x8MaxS:
return graph()->NewNode(mcgraph()->machine()->I16x8MaxS(), inputs[0],
inputs[1]);
case wasm::kExprI16x8Eq:
return graph()->NewNode(mcgraph()->machine()->I16x8Eq(), inputs[0],
inputs[1]);
case wasm::kExprI16x8Ne:
return graph()->NewNode(mcgraph()->machine()->I16x8Ne(), inputs[0],
inputs[1]);
case wasm::kExprI16x8LtS:
return graph()->NewNode(mcgraph()->machine()->I16x8GtS(), inputs[1],
inputs[0]);
case wasm::kExprI16x8LeS:
return graph()->NewNode(mcgraph()->machine()->I16x8GeS(), inputs[1],
inputs[0]);
case wasm::kExprI16x8GtS:
return graph()->NewNode(mcgraph()->machine()->I16x8GtS(), inputs[0],
inputs[1]);
case wasm::kExprI16x8GeS:
return graph()->NewNode(mcgraph()->machine()->I16x8GeS(), inputs[0],
inputs[1]);
case wasm::kExprI16x8UConvertI8x16Low:
return graph()->NewNode(mcgraph()->machine()->I16x8UConvertI8x16Low(),
inputs[0]);
case wasm::kExprI16x8UConvertI8x16High:
return graph()->NewNode(mcgraph()->machine()->I16x8UConvertI8x16High(),
inputs[0]);
case wasm::kExprI16x8UConvertI32x4:
return graph()->NewNode(mcgraph()->machine()->I16x8UConvertI32x4(),
inputs[0], inputs[1]);
case wasm::kExprI16x8AddSaturateU:
return graph()->NewNode(mcgraph()->machine()->I16x8AddSaturateU(),
inputs[0], inputs[1]);
case wasm::kExprI16x8SubSaturateU:
return graph()->NewNode(mcgraph()->machine()->I16x8SubSaturateU(),
inputs[0], inputs[1]);
case wasm::kExprI16x8MinU:
return graph()->NewNode(mcgraph()->machine()->I16x8MinU(), inputs[0],
inputs[1]);
case wasm::kExprI16x8MaxU:
return graph()->NewNode(mcgraph()->machine()->I16x8MaxU(), inputs[0],
inputs[1]);
case wasm::kExprI16x8LtU:
return graph()->NewNode(mcgraph()->machine()->I16x8GtU(), inputs[1],
inputs[0]);
case wasm::kExprI16x8LeU:
return graph()->NewNode(mcgraph()->machine()->I16x8GeU(), inputs[1],
inputs[0]);
case wasm::kExprI16x8GtU:
return graph()->NewNode(mcgraph()->machine()->I16x8GtU(), inputs[0],
inputs[1]);
case wasm::kExprI16x8GeU:
return graph()->NewNode(mcgraph()->machine()->I16x8GeU(), inputs[0],
inputs[1]);
case wasm::kExprI8x16Splat:
return graph()->NewNode(mcgraph()->machine()->I8x16Splat(), inputs[0]);
case wasm::kExprI8x16Neg:
return graph()->NewNode(mcgraph()->machine()->I8x16Neg(), inputs[0]);
case wasm::kExprI8x16SConvertI16x8:
return graph()->NewNode(mcgraph()->machine()->I8x16SConvertI16x8(),
inputs[0], inputs[1]);
case wasm::kExprI8x16Add:
return graph()->NewNode(mcgraph()->machine()->I8x16Add(), inputs[0],
inputs[1]);
case wasm::kExprI8x16AddSaturateS:
return graph()->NewNode(mcgraph()->machine()->I8x16AddSaturateS(),
inputs[0], inputs[1]);
case wasm::kExprI8x16Sub:
return graph()->NewNode(mcgraph()->machine()->I8x16Sub(), inputs[0],
inputs[1]);
case wasm::kExprI8x16SubSaturateS:
return graph()->NewNode(mcgraph()->machine()->I8x16SubSaturateS(),
inputs[0], inputs[1]);
case wasm::kExprI8x16Mul:
return graph()->NewNode(mcgraph()->machine()->I8x16Mul(), inputs[0],
inputs[1]);
case wasm::kExprI8x16MinS:
return graph()->NewNode(mcgraph()->machine()->I8x16MinS(), inputs[0],
inputs[1]);
case wasm::kExprI8x16MaxS:
return graph()->NewNode(mcgraph()->machine()->I8x16MaxS(), inputs[0],
inputs[1]);
case wasm::kExprI8x16Eq:
return graph()->NewNode(mcgraph()->machine()->I8x16Eq(), inputs[0],
inputs[1]);
case wasm::kExprI8x16Ne:
return graph()->NewNode(mcgraph()->machine()->I8x16Ne(), inputs[0],
inputs[1]);
case wasm::kExprI8x16LtS:
return graph()->NewNode(mcgraph()->machine()->I8x16GtS(), inputs[1],
inputs[0]);
case wasm::kExprI8x16LeS:
return graph()->NewNode(mcgraph()->machine()->I8x16GeS(), inputs[1],
inputs[0]);
case wasm::kExprI8x16GtS:
return graph()->NewNode(mcgraph()->machine()->I8x16GtS(), inputs[0],
inputs[1]);
case wasm::kExprI8x16GeS:
return graph()->NewNode(mcgraph()->machine()->I8x16GeS(), inputs[0],
inputs[1]);
case wasm::kExprI8x16UConvertI16x8:
return graph()->NewNode(mcgraph()->machine()->I8x16UConvertI16x8(),
inputs[0], inputs[1]);
case wasm::kExprI8x16AddSaturateU:
return graph()->NewNode(mcgraph()->machine()->I8x16AddSaturateU(),
inputs[0], inputs[1]);
case wasm::kExprI8x16SubSaturateU:
return graph()->NewNode(mcgraph()->machine()->I8x16SubSaturateU(),
inputs[0], inputs[1]);
case wasm::kExprI8x16MinU:
return graph()->NewNode(mcgraph()->machine()->I8x16MinU(), inputs[0],
inputs[1]);
case wasm::kExprI8x16MaxU:
return graph()->NewNode(mcgraph()->machine()->I8x16MaxU(), inputs[0],
inputs[1]);
case wasm::kExprI8x16LtU:
return graph()->NewNode(mcgraph()->machine()->I8x16GtU(), inputs[1],
inputs[0]);
case wasm::kExprI8x16LeU:
return graph()->NewNode(mcgraph()->machine()->I8x16GeU(), inputs[1],
inputs[0]);
case wasm::kExprI8x16GtU:
return graph()->NewNode(mcgraph()->machine()->I8x16GtU(), inputs[0],
inputs[1]);
case wasm::kExprI8x16GeU:
return graph()->NewNode(mcgraph()->machine()->I8x16GeU(), inputs[0],
inputs[1]);
case wasm::kExprS128And:
return graph()->NewNode(mcgraph()->machine()->S128And(), inputs[0],
inputs[1]);
case wasm::kExprS128Or:
return graph()->NewNode(mcgraph()->machine()->S128Or(), inputs[0],
inputs[1]);
case wasm::kExprS128Xor:
return graph()->NewNode(mcgraph()->machine()->S128Xor(), inputs[0],
inputs[1]);
case wasm::kExprS128Not:
return graph()->NewNode(mcgraph()->machine()->S128Not(), inputs[0]);
case wasm::kExprS128Select:
return graph()->NewNode(mcgraph()->machine()->S128Select(), inputs[0],
inputs[1], inputs[2]);
case wasm::kExprS1x4AnyTrue:
return graph()->NewNode(mcgraph()->machine()->S1x4AnyTrue(), inputs[0]);
case wasm::kExprS1x4AllTrue:
return graph()->NewNode(mcgraph()->machine()->S1x4AllTrue(), inputs[0]);
case wasm::kExprS1x8AnyTrue:
return graph()->NewNode(mcgraph()->machine()->S1x8AnyTrue(), inputs[0]);
case wasm::kExprS1x8AllTrue:
return graph()->NewNode(mcgraph()->machine()->S1x8AllTrue(), inputs[0]);
case wasm::kExprS1x16AnyTrue:
return graph()->NewNode(mcgraph()->machine()->S1x16AnyTrue(), inputs[0]);
case wasm::kExprS1x16AllTrue:
return graph()->NewNode(mcgraph()->machine()->S1x16AllTrue(), inputs[0]);
default:
FATAL_UNSUPPORTED_OPCODE(opcode);
}
}
Node* WasmGraphBuilder::SimdLaneOp(wasm::WasmOpcode opcode, uint8_t lane,
Node* const* inputs) {
has_simd_ = true;
switch (opcode) {
case wasm::kExprF32x4ExtractLane:
return graph()->NewNode(mcgraph()->machine()->F32x4ExtractLane(lane),
inputs[0]);
case wasm::kExprF32x4ReplaceLane:
return graph()->NewNode(mcgraph()->machine()->F32x4ReplaceLane(lane),
inputs[0], inputs[1]);
case wasm::kExprI32x4ExtractLane:
return graph()->NewNode(mcgraph()->machine()->I32x4ExtractLane(lane),
inputs[0]);
case wasm::kExprI32x4ReplaceLane:
return graph()->NewNode(mcgraph()->machine()->I32x4ReplaceLane(lane),
inputs[0], inputs[1]);
case wasm::kExprI16x8ExtractLane:
return graph()->NewNode(mcgraph()->machine()->I16x8ExtractLane(lane),
inputs[0]);
case wasm::kExprI16x8ReplaceLane:
return graph()->NewNode(mcgraph()->machine()->I16x8ReplaceLane(lane),
inputs[0], inputs[1]);
case wasm::kExprI8x16ExtractLane:
return graph()->NewNode(mcgraph()->machine()->I8x16ExtractLane(lane),
inputs[0]);
case wasm::kExprI8x16ReplaceLane:
return graph()->NewNode(mcgraph()->machine()->I8x16ReplaceLane(lane),
inputs[0], inputs[1]);
default:
FATAL_UNSUPPORTED_OPCODE(opcode);
}
}
Node* WasmGraphBuilder::SimdShiftOp(wasm::WasmOpcode opcode, uint8_t shift,
Node* const* inputs) {
has_simd_ = true;
switch (opcode) {
case wasm::kExprI32x4Shl:
return graph()->NewNode(mcgraph()->machine()->I32x4Shl(shift), inputs[0]);
case wasm::kExprI32x4ShrS:
return graph()->NewNode(mcgraph()->machine()->I32x4ShrS(shift),
inputs[0]);
case wasm::kExprI32x4ShrU:
return graph()->NewNode(mcgraph()->machine()->I32x4ShrU(shift),
inputs[0]);
case wasm::kExprI16x8Shl:
return graph()->NewNode(mcgraph()->machine()->I16x8Shl(shift), inputs[0]);
case wasm::kExprI16x8ShrS:
return graph()->NewNode(mcgraph()->machine()->I16x8ShrS(shift),
inputs[0]);
case wasm::kExprI16x8ShrU:
return graph()->NewNode(mcgraph()->machine()->I16x8ShrU(shift),
inputs[0]);
case wasm::kExprI8x16Shl:
return graph()->NewNode(mcgraph()->machine()->I8x16Shl(shift), inputs[0]);
case wasm::kExprI8x16ShrS:
return graph()->NewNode(mcgraph()->machine()->I8x16ShrS(shift),
inputs[0]);
case wasm::kExprI8x16ShrU:
return graph()->NewNode(mcgraph()->machine()->I8x16ShrU(shift),
inputs[0]);
default:
FATAL_UNSUPPORTED_OPCODE(opcode);
}
}
Node* WasmGraphBuilder::Simd8x16ShuffleOp(const uint8_t shuffle[16],
Node* const* inputs) {
has_simd_ = true;
return graph()->NewNode(mcgraph()->machine()->S8x16Shuffle(shuffle),
inputs[0], inputs[1]);
}
#define ATOMIC_BINOP_LIST(V) \
V(I32AtomicAdd, Add, Uint32, Word32) \
V(I64AtomicAdd, Add, Uint64, Word64) \
V(I32AtomicAdd8U, Add, Uint8, Word32) \
V(I32AtomicAdd16U, Add, Uint16, Word32) \
V(I64AtomicAdd8U, Add, Uint8, Word64) \
V(I64AtomicAdd16U, Add, Uint16, Word64) \
V(I64AtomicAdd32U, Add, Uint32, Word64) \
V(I32AtomicSub, Sub, Uint32, Word32) \
V(I64AtomicSub, Sub, Uint64, Word64) \
V(I32AtomicSub8U, Sub, Uint8, Word32) \
V(I32AtomicSub16U, Sub, Uint16, Word32) \
V(I64AtomicSub8U, Sub, Uint8, Word64) \
V(I64AtomicSub16U, Sub, Uint16, Word64) \
V(I64AtomicSub32U, Sub, Uint32, Word64) \
V(I32AtomicAnd, And, Uint32, Word32) \
V(I64AtomicAnd, And, Uint64, Word64) \
V(I32AtomicAnd8U, And, Uint8, Word32) \
V(I64AtomicAnd16U, And, Uint16, Word64) \
V(I32AtomicAnd16U, And, Uint16, Word32) \
V(I64AtomicAnd8U, And, Uint8, Word64) \
V(I64AtomicAnd32U, And, Uint32, Word64) \
V(I32AtomicOr, Or, Uint32, Word32) \
V(I64AtomicOr, Or, Uint64, Word64) \
V(I32AtomicOr8U, Or, Uint8, Word32) \
V(I32AtomicOr16U, Or, Uint16, Word32) \
V(I64AtomicOr8U, Or, Uint8, Word64) \
V(I64AtomicOr16U, Or, Uint16, Word64) \
V(I64AtomicOr32U, Or, Uint32, Word64) \
V(I32AtomicXor, Xor, Uint32, Word32) \
V(I64AtomicXor, Xor, Uint64, Word64) \
V(I32AtomicXor8U, Xor, Uint8, Word32) \
V(I32AtomicXor16U, Xor, Uint16, Word32) \
V(I64AtomicXor8U, Xor, Uint8, Word64) \
V(I64AtomicXor16U, Xor, Uint16, Word64) \
V(I64AtomicXor32U, Xor, Uint32, Word64) \
V(I32AtomicExchange, Exchange, Uint32, Word32) \
V(I64AtomicExchange, Exchange, Uint64, Word64) \
V(I32AtomicExchange8U, Exchange, Uint8, Word32) \
V(I32AtomicExchange16U, Exchange, Uint16, Word32) \
V(I64AtomicExchange8U, Exchange, Uint8, Word64) \
V(I64AtomicExchange16U, Exchange, Uint16, Word64) \
V(I64AtomicExchange32U, Exchange, Uint32, Word64)
#define ATOMIC_CMP_EXCHG_LIST(V) \
V(I32AtomicCompareExchange, Uint32, Word32) \
V(I64AtomicCompareExchange, Uint64, Word64) \
V(I32AtomicCompareExchange8U, Uint8, Word32) \
V(I32AtomicCompareExchange16U, Uint16, Word32) \
V(I64AtomicCompareExchange8U, Uint8, Word64) \
V(I64AtomicCompareExchange16U, Uint16, Word64) \
V(I64AtomicCompareExchange32U, Uint32, Word64)
#define ATOMIC_LOAD_LIST(V) \
V(I32AtomicLoad, Uint32, Word32) \
V(I64AtomicLoad, Uint64, Word64) \
V(I32AtomicLoad8U, Uint8, Word32) \
V(I32AtomicLoad16U, Uint16, Word32) \
V(I64AtomicLoad8U, Uint8, Word64) \
V(I64AtomicLoad16U, Uint16, Word64) \
V(I64AtomicLoad32U, Uint32, Word64)
#define ATOMIC_STORE_LIST(V) \
V(I32AtomicStore, Uint32, kWord32, Word32) \
V(I64AtomicStore, Uint64, kWord64, Word64) \
V(I32AtomicStore8U, Uint8, kWord8, Word32) \
V(I32AtomicStore16U, Uint16, kWord16, Word32) \
V(I64AtomicStore8U, Uint8, kWord8, Word64) \
V(I64AtomicStore16U, Uint16, kWord16, Word64) \
V(I64AtomicStore32U, Uint32, kWord32, Word64)
Node* WasmGraphBuilder::AtomicOp(wasm::WasmOpcode opcode, Node* const* inputs,
uint32_t alignment, uint32_t offset,
wasm::WasmCodePosition position) {
Node* node;
switch (opcode) {
#define BUILD_ATOMIC_BINOP(Name, Operation, Type, Prefix) \
case wasm::kExpr##Name: { \
Node* index = CheckBoundsAndAlignment( \
wasm::ValueTypes::MemSize(MachineType::Type()), inputs[0], offset, \
position); \
node = graph()->NewNode( \
mcgraph()->machine()->Prefix##Atomic##Operation(MachineType::Type()), \
MemBuffer(offset), index, inputs[1], Effect(), Control()); \
break; \
}
ATOMIC_BINOP_LIST(BUILD_ATOMIC_BINOP)
#undef BUILD_ATOMIC_BINOP
#define BUILD_ATOMIC_CMP_EXCHG(Name, Type, Prefix) \
case wasm::kExpr##Name: { \
Node* index = CheckBoundsAndAlignment( \
wasm::ValueTypes::MemSize(MachineType::Type()), inputs[0], offset, \
position); \
node = graph()->NewNode( \
mcgraph()->machine()->Prefix##AtomicCompareExchange( \
MachineType::Type()), \
MemBuffer(offset), index, inputs[1], inputs[2], Effect(), Control()); \
break; \
}
ATOMIC_CMP_EXCHG_LIST(BUILD_ATOMIC_CMP_EXCHG)
#undef BUILD_ATOMIC_CMP_EXCHG
#define BUILD_ATOMIC_LOAD_OP(Name, Type, Prefix) \
case wasm::kExpr##Name: { \
Node* index = CheckBoundsAndAlignment( \
wasm::ValueTypes::MemSize(MachineType::Type()), inputs[0], offset, \
position); \
node = graph()->NewNode( \
mcgraph()->machine()->Prefix##AtomicLoad(MachineType::Type()), \
MemBuffer(offset), index, Effect(), Control()); \
break; \
}
ATOMIC_LOAD_LIST(BUILD_ATOMIC_LOAD_OP)
#undef BUILD_ATOMIC_LOAD_OP
#define BUILD_ATOMIC_STORE_OP(Name, Type, Rep, Prefix) \
case wasm::kExpr##Name: { \
Node* index = CheckBoundsAndAlignment( \
wasm::ValueTypes::MemSize(MachineType::Type()), inputs[0], offset, \
position); \
node = graph()->NewNode( \
mcgraph()->machine()->Prefix##AtomicStore(MachineRepresentation::Rep), \
MemBuffer(offset), index, inputs[1], Effect(), Control()); \
break; \
}
ATOMIC_STORE_LIST(BUILD_ATOMIC_STORE_OP)
#undef BUILD_ATOMIC_STORE_OP
default:
FATAL_UNSUPPORTED_OPCODE(opcode);
}
return SetEffect(node);
}
#undef ATOMIC_BINOP_LIST
#undef ATOMIC_CMP_EXCHG_LIST
#undef ATOMIC_LOAD_LIST
#undef ATOMIC_STORE_LIST
class WasmDecorator final : public GraphDecorator {
public:
explicit WasmDecorator(NodeOriginTable* origins, wasm::Decoder* decoder)
: origins_(origins), decoder_(decoder) {}
void Decorate(Node* node) final {
origins_->SetNodeOrigin(
node, NodeOrigin("wasm graph creation", "n/a",
NodeOrigin::kWasmBytecode, decoder_->position()));
}
private:
compiler::NodeOriginTable* origins_;
wasm::Decoder* decoder_;
};
void WasmGraphBuilder::AddBytecodePositionDecorator(
NodeOriginTable* node_origins, wasm::Decoder* decoder) {
DCHECK_NULL(decorator_);
decorator_ = new (graph()->zone()) WasmDecorator(node_origins, decoder);
graph()->AddDecorator(decorator_);
}
void WasmGraphBuilder::RemoveBytecodePositionDecorator() {
DCHECK_NOT_NULL(decorator_);
graph()->RemoveDecorator(decorator_);
decorator_ = nullptr;
}
namespace {
bool must_record_function_compilation(Isolate* isolate) {
return isolate->logger()->is_listening_to_code_events() ||
isolate->is_profiling();
}
PRINTF_FORMAT(4, 5)
void RecordFunctionCompilation(CodeEventListener::LogEventsAndTags tag,
Isolate* isolate, Handle<Code> code,
const char* format, ...) {
DCHECK(must_record_function_compilation(isolate));
ScopedVector<char> buffer(128);
va_list arguments;
va_start(arguments, format);
int len = VSNPrintF(buffer, format, arguments);
CHECK_LT(0, len);
va_end(arguments);
Handle<String> name_str =
isolate->factory()->NewStringFromAsciiChecked(buffer.start());
PROFILE(isolate, CodeCreateEvent(tag, AbstractCode::cast(*code), *name_str));
}
class WasmWrapperGraphBuilder : public WasmGraphBuilder {
public:
WasmWrapperGraphBuilder(Zone* zone, wasm::ModuleEnv* env, JSGraph* jsgraph,
wasm::FunctionSig* sig,
compiler::SourcePositionTable* spt,
StubCallMode stub_mode)
: WasmGraphBuilder(env, zone, jsgraph, sig, spt),
isolate_(jsgraph->isolate()),
jsgraph_(jsgraph),
stub_mode_(stub_mode) {}
Node* BuildAllocateHeapNumberWithValue(Node* value, Node* control) {
MachineOperatorBuilder* machine = mcgraph()->machine();
CommonOperatorBuilder* common = mcgraph()->common();
Node* target = (stub_mode_ == StubCallMode::kCallWasmRuntimeStub)
? mcgraph()->RelocatableIntPtrConstant(
wasm::WasmCode::kWasmAllocateHeapNumber,
RelocInfo::WASM_STUB_CALL)
: jsgraph()->HeapConstant(
BUILTIN_CODE(isolate_, AllocateHeapNumber));
if (!allocate_heap_number_operator_.is_set()) {
auto call_descriptor = Linkage::GetStubCallDescriptor(
mcgraph()->zone(), AllocateHeapNumberDescriptor(), 0,
CallDescriptor::kNoFlags, Operator::kNoThrow, stub_mode_);
allocate_heap_number_operator_.set(common->Call(call_descriptor));
}
Node* heap_number = graph()->NewNode(allocate_heap_number_operator_.get(),
target, Effect(), control);
SetEffect(
graph()->NewNode(machine->Store(StoreRepresentation(
MachineRepresentation::kFloat64, kNoWriteBarrier)),
heap_number, BuildHeapNumberValueIndexConstant(),
value, heap_number, control));
return heap_number;
}
Node* BuildChangeSmiToFloat64(Node* value) {
return graph()->NewNode(mcgraph()->machine()->ChangeInt32ToFloat64(),
BuildChangeSmiToInt32(value));
}
Node* BuildTestHeapObject(Node* value) {
return graph()->NewNode(mcgraph()->machine()->WordAnd(), value,
mcgraph()->IntPtrConstant(kHeapObjectTag));
}
Node* BuildLoadHeapNumberValue(Node* value) {
return SetEffect(graph()->NewNode(
mcgraph()->machine()->Load(MachineType::Float64()), value,
BuildHeapNumberValueIndexConstant(), Effect(), Control()));
}
Node* BuildHeapNumberValueIndexConstant() {
return mcgraph()->IntPtrConstant(HeapNumber::kValueOffset - kHeapObjectTag);
}
Node* BuildChangeInt32ToTagged(Node* value) {
MachineOperatorBuilder* machine = mcgraph()->machine();
CommonOperatorBuilder* common = mcgraph()->common();
if (SmiValuesAre32Bits()) {
return BuildChangeInt32ToSmi(value);
}
DCHECK(SmiValuesAre31Bits());
Node* effect = Effect();
Node* control = Control();
Node* add = graph()->NewNode(machine->Int32AddWithOverflow(), value, value,
graph()->start());
Node* ovf = graph()->NewNode(common->Projection(1), add, graph()->start());
Node* branch =
graph()->NewNode(common->Branch(BranchHint::kFalse), ovf, control);
Node* if_true = graph()->NewNode(common->IfTrue(), branch);
Node* vtrue = BuildAllocateHeapNumberWithValue(
graph()->NewNode(machine->ChangeInt32ToFloat64(), value), if_true);
Node* etrue = Effect();
Node* if_false = graph()->NewNode(common->IfFalse(), branch);
Node* vfalse = graph()->NewNode(common->Projection(0), add, if_false);
vfalse = BuildChangeInt32ToIntPtr(vfalse);
Node* merge =
SetControl(graph()->NewNode(common->Merge(2), if_true, if_false));
SetEffect(graph()->NewNode(common->EffectPhi(2), etrue, effect, merge));
return graph()->NewNode(common->Phi(MachineRepresentation::kTagged, 2),
vtrue, vfalse, merge);
}
Node* BuildChangeFloat64ToTagged(Node* value) {
MachineOperatorBuilder* machine = mcgraph()->machine();
CommonOperatorBuilder* common = mcgraph()->common();
// Check several conditions:
// i32?
// ├─ true: zero?
// │ ├─ true: negative?
// │ │ ├─ true: box
// │ │ └─ false: potentially Smi
// │ └─ false: potentially Smi
// └─ false: box
// For potential Smi values, depending on whether Smis are 31 or 32 bit, we
// still need to check whether the value fits in a Smi.
Node* effect = Effect();
Node* control = Control();
Node* value32 = graph()->NewNode(machine->RoundFloat64ToInt32(), value);
Node* check_i32 = graph()->NewNode(
machine->Float64Equal(), value,
graph()->NewNode(machine->ChangeInt32ToFloat64(), value32));
Node* branch_i32 = graph()->NewNode(common->Branch(), check_i32, control);
Node* if_i32 = graph()->NewNode(common->IfTrue(), branch_i32);
Node* if_not_i32 = graph()->NewNode(common->IfFalse(), branch_i32);
// We only need to check for -0 if the {value} can potentially contain -0.
Node* check_zero = graph()->NewNode(machine->Word32Equal(), value32,
mcgraph()->Int32Constant(0));
Node* branch_zero = graph()->NewNode(common->Branch(BranchHint::kFalse),
check_zero, if_i32);
Node* if_zero = graph()->NewNode(common->IfTrue(), branch_zero);
Node* if_not_zero = graph()->NewNode(common->IfFalse(), branch_zero);
// In case of 0, we need to check the high bits for the IEEE -0 pattern.
Node* check_negative = graph()->NewNode(
machine->Int32LessThan(),
graph()->NewNode(machine->Float64ExtractHighWord32(), value),
mcgraph()->Int32Constant(0));
Node* branch_negative = graph()->NewNode(common->Branch(BranchHint::kFalse),
check_negative, if_zero);
Node* if_negative = graph()->NewNode(common->IfTrue(), branch_negative);
Node* if_not_negative =
graph()->NewNode(common->IfFalse(), branch_negative);
// We need to create a box for negative 0.
Node* if_smi =
graph()->NewNode(common->Merge(2), if_not_zero, if_not_negative);
Node* if_box = graph()->NewNode(common->Merge(2), if_not_i32, if_negative);
// On 64-bit machines we can just wrap the 32-bit integer in a smi, for
// 32-bit machines we need to deal with potential overflow and fallback to
// boxing.
Node* vsmi;
if (SmiValuesAre32Bits()) {
vsmi = BuildChangeInt32ToSmi(value32);
} else {
DCHECK(SmiValuesAre31Bits());
Node* smi_tag = graph()->NewNode(machine->Int32AddWithOverflow(), value32,
value32, if_smi);
Node* check_ovf =
graph()->NewNode(common->Projection(1), smi_tag, if_smi);
Node* branch_ovf = graph()->NewNode(common->Branch(BranchHint::kFalse),
check_ovf, if_smi);
Node* if_ovf = graph()->NewNode(common->IfTrue(), branch_ovf);
if_box = graph()->NewNode(common->Merge(2), if_ovf, if_box);
if_smi = graph()->NewNode(common->IfFalse(), branch_ovf);
vsmi = graph()->NewNode(common->Projection(0), smi_tag, if_smi);
vsmi = BuildChangeInt32ToIntPtr(vsmi);
}
// Allocate the box for the {value}.
Node* vbox = BuildAllocateHeapNumberWithValue(value, if_box);
Node* ebox = Effect();
Node* merge =
SetControl(graph()->NewNode(common->Merge(2), if_smi, if_box));
SetEffect(graph()->NewNode(common->EffectPhi(2), effect, ebox, merge));
return graph()->NewNode(common->Phi(MachineRepresentation::kTagged, 2),
vsmi, vbox, merge);
}
int AddArgumentNodes(Node** args, int pos, int param_count,
wasm::FunctionSig* sig) {
// Convert wasm numbers to JS values.
for (int i = 0; i < param_count; ++i) {
Node* param =
Param(i + 1); // Start from index 1 to drop the instance_node.
args[pos++] = ToJS(param, sig->GetParam(i));
}
return pos;
}
Node* BuildJavaScriptToNumber(Node* node, Node* js_context) {
auto call_descriptor = Linkage::GetStubCallDescriptor(
mcgraph()->zone(), TypeConversionDescriptor{}, 0,
CallDescriptor::kNoFlags, Operator::kNoProperties, stub_mode_);
Node* stub_code =
(stub_mode_ == StubCallMode::kCallWasmRuntimeStub)
? mcgraph()->RelocatableIntPtrConstant(
wasm::WasmCode::kWasmToNumber, RelocInfo::WASM_STUB_CALL)
: jsgraph()->HeapConstant(BUILTIN_CODE(isolate_, ToNumber));
Node* result = SetEffect(
graph()->NewNode(mcgraph()->common()->Call(call_descriptor), stub_code,
node, js_context, Effect(), Control()));
SetSourcePosition(result, 1);
return result;
}
Node* BuildChangeTaggedToFloat64(Node* value) {
MachineOperatorBuilder* machine = mcgraph()->machine();
CommonOperatorBuilder* common = mcgraph()->common();
// Implement the following decision tree:
// heap object?
// ├─ true: undefined?
// │ ├─ true: f64 const
// │ └─ false: load heap number value
// └─ false: smi to float64
Node* check_heap_object = BuildTestHeapObject(value);
Diamond is_heap_object(graph(), common, check_heap_object,
BranchHint::kFalse);
is_heap_object.Chain(Control());
SetControl(is_heap_object.if_true);
Node* orig_effect = Effect();
Node* undefined_node =
LOAD_INSTANCE_FIELD(UndefinedValue, MachineType::TaggedPointer());
Node* check_undefined =
graph()->NewNode(machine->WordEqual(), value, undefined_node);
Node* effect_tagged = Effect();
Diamond is_undefined(graph(), common, check_undefined, BranchHint::kFalse);
is_undefined.Nest(is_heap_object, true);
SetControl(is_undefined.if_false);
Node* vheap_number = BuildLoadHeapNumberValue(value);
Node* effect_undefined = Effect();
SetControl(is_undefined.merge);
Node* vundefined =
mcgraph()->Float64Constant(std::numeric_limits<double>::quiet_NaN());
Node* vtagged = is_undefined.Phi(MachineRepresentation::kFloat64,
vundefined, vheap_number);
effect_tagged = is_undefined.EffectPhi(effect_tagged, effect_undefined);
// If input is Smi: just convert to float64.
Node* vfrom_smi = BuildChangeSmiToFloat64(value);
SetControl(is_heap_object.merge);
SetEffect(is_heap_object.EffectPhi(effect_tagged, orig_effect));
return is_heap_object.Phi(MachineRepresentation::kFloat64, vtagged,
vfrom_smi);
}
Node* ToJS(Node* node, wasm::ValueType type) {
switch (type) {
case wasm::kWasmI32:
return BuildChangeInt32ToTagged(node);
case wasm::kWasmS128:
case wasm::kWasmI64:
UNREACHABLE();
case wasm::kWasmF32:
node = graph()->NewNode(mcgraph()->machine()->ChangeFloat32ToFloat64(),
node);
return BuildChangeFloat64ToTagged(node);
case wasm::kWasmF64:
return BuildChangeFloat64ToTagged(node);
case wasm::kWasmAnyRef:
return node;
default:
UNREACHABLE();
}
}
Node* FromJS(Node* node, Node* js_context, wasm::ValueType type) {
DCHECK_NE(wasm::kWasmStmt, type);
// The parameter is of type AnyRef, we take it as is.
if (type == wasm::kWasmAnyRef) {
return node;
}
// Do a JavaScript ToNumber.
Node* num = BuildJavaScriptToNumber(node, js_context);
// Change representation.
num = BuildChangeTaggedToFloat64(num);
switch (type) {
case wasm::kWasmI32: {
num = graph()->NewNode(mcgraph()->machine()->TruncateFloat64ToWord32(),
num);
break;
}
case wasm::kWasmS128:
case wasm::kWasmI64:
UNREACHABLE();
case wasm::kWasmF32:
num = graph()->NewNode(mcgraph()->machine()->TruncateFloat64ToFloat32(),
num);
break;
case wasm::kWasmF64:
break;
default:
UNREACHABLE();
}
return num;
}
void BuildModifyThreadInWasmFlag(bool new_value) {
if (!trap_handler::IsTrapHandlerEnabled()) return;
Node* thread_in_wasm_flag_address_address =
graph()->NewNode(mcgraph()->common()->ExternalConstant(
ExternalReference::wasm_thread_in_wasm_flag_address_address(
isolate_)));
Node* thread_in_wasm_flag_address = SetEffect(graph()->NewNode(
mcgraph()->machine()->Load(LoadRepresentation(MachineType::Pointer())),
thread_in_wasm_flag_address_address, mcgraph()->Int32Constant(0),
Effect(), Control()));
SetEffect(graph()->NewNode(
mcgraph()->machine()->Store(StoreRepresentation(
MachineRepresentation::kWord32, kNoWriteBarrier)),
thread_in_wasm_flag_address, mcgraph()->Int32Constant(0),
mcgraph()->Int32Constant(new_value ? 1 : 0), Effect(), Control()));
}
Node* BuildLoadFunctionDataFromExportedFunction(Node* closure) {
Node* shared = SetEffect(graph()->NewNode(
jsgraph()->machine()->Load(MachineType::AnyTagged()), closure,
jsgraph()->Int32Constant(JSFunction::kSharedFunctionInfoOffset -
kHeapObjectTag),
Effect(), Control()));
return SetEffect(graph()->NewNode(
jsgraph()->machine()->Load(MachineType::AnyTagged()), shared,
jsgraph()->Int32Constant(SharedFunctionInfo::kFunctionDataOffset -
kHeapObjectTag),
Effect(), Control()));
}
Node* BuildLoadInstanceFromExportedFunctionData(Node* function_data) {
return SetEffect(graph()->NewNode(
jsgraph()->machine()->Load(MachineType::AnyTagged()), function_data,
jsgraph()->Int32Constant(WasmExportedFunctionData::kInstanceOffset -
kHeapObjectTag),
Effect(), Control()));
}
Node* BuildLoadFunctionIndexFromExportedFunctionData(Node* function_data) {
Node* function_index_smi = SetEffect(graph()->NewNode(
jsgraph()->machine()->Load(MachineType::AnyTagged()), function_data,
jsgraph()->Int32Constant(
WasmExportedFunctionData::kFunctionIndexOffset - kHeapObjectTag),
Effect(), Control()));
Node* function_index = BuildChangeSmiToInt32(function_index_smi);
return function_index;
}
Node* BuildLoadJumpTableOffsetFromExportedFunctionData(Node* function_data) {
Node* jump_table_offset_smi = SetEffect(graph()->NewNode(
jsgraph()->machine()->Load(MachineType::AnyTagged()), function_data,
jsgraph()->Int32Constant(
WasmExportedFunctionData::kJumpTableOffsetOffset - kHeapObjectTag),
Effect(), Control()));
Node* jump_table_offset = BuildChangeSmiToInt32(jump_table_offset_smi);
return jump_table_offset;
}
void BuildJSToWasmWrapper(bool is_import) {
const int wasm_count = static_cast<int>(sig_->parameter_count());
// Build the start and the JS parameter nodes.
SetEffect(SetControl(Start(wasm_count + 5)));
// Create the js_closure and js_context parameters.
Node* js_closure =
graph()->NewNode(jsgraph()->common()->Parameter(
Linkage::kJSCallClosureParamIndex, "%closure"),
graph()->start());
Node* js_context = graph()->NewNode(
mcgraph()->common()->Parameter(
Linkage::GetJSCallContextParamIndex(wasm_count + 1), "%context"),
graph()->start());
// Create the instance_node node to pass as parameter. It is loaded from
// an actual reference to an instance or a placeholder reference,
// called {WasmExportedFunction} via the {WasmExportedFunctionData}
// structure.
Node* function_data = BuildLoadFunctionDataFromExportedFunction(js_closure);
instance_node_.set(
BuildLoadInstanceFromExportedFunctionData(function_data));
if (!wasm::IsJSCompatibleSignature(sig_)) {
// Throw a TypeError. Use the js_context of the calling javascript
// function (passed as a parameter), such that the generated code is
// js_context independent.
BuildCallToRuntimeWithContext(Runtime::kWasmThrowTypeError, js_context,
nullptr, 0);
Return(jsgraph()->SmiConstant(0));
return;
}
const int args_count = wasm_count + 1; // +1 for wasm_code.
Node** args = Buffer(args_count);
Node** rets;
// Convert JS parameters to wasm numbers.
for (int i = 0; i < wasm_count; ++i) {
Node* param = Param(i + 1);
Node* wasm_param = FromJS(param, js_context, sig_->GetParam(i));
args[i + 1] = wasm_param;
}
// Set the ThreadInWasm flag before we do the actual call.
BuildModifyThreadInWasmFlag(true);
if (is_import) {
// Call to an imported function.
// Load function index from {WasmExportedFunctionData}.
Node* function_index =
BuildLoadFunctionIndexFromExportedFunctionData(function_data);
BuildImportWasmCall(sig_, args, &rets, wasm::kNoCodePosition,
function_index);
} else {
// Call to a wasm function defined in this module.
// The call target is the jump table slot for that function.
Node* jump_table_start =
LOAD_INSTANCE_FIELD(JumpTableStart, MachineType::Pointer());
Node* jump_table_offset =
BuildLoadJumpTableOffsetFromExportedFunctionData(function_data);
Node* jump_table_slot = graph()->NewNode(
mcgraph()->machine()->IntAdd(), jump_table_start, jump_table_offset);
args[0] = jump_table_slot;
BuildWasmCall(sig_, args, &rets, wasm::kNoCodePosition, nullptr,
kNoRetpoline);
}
// Clear the ThreadInWasm flag.
BuildModifyThreadInWasmFlag(false);
Node* jsval = sig_->return_count() == 0 ? jsgraph()->UndefinedConstant()
: ToJS(rets[0], sig_->GetReturn());
Return(jsval);
}
bool BuildWasmToJSWrapper(Handle<JSReceiver> target, int index) {
DCHECK(target->IsCallable());
int wasm_count = static_cast<int>(sig_->parameter_count());
// Build the start and the parameter nodes.
SetEffect(SetControl(Start(wasm_count + 3)));
// Create the instance_node from the passed parameter.
instance_node_.set(Param(wasm::kWasmInstanceParameterIndex));
Node* callables_node = LOAD_INSTANCE_FIELD(ImportedFunctionCallables,
MachineType::TaggedPointer());
Node* callable_node = LOAD_FIXED_ARRAY_SLOT(callables_node, index);
Node* undefined_node =
LOAD_INSTANCE_FIELD(UndefinedValue, MachineType::TaggedPointer());
Node* native_context =
LOAD_INSTANCE_FIELD(NativeContext, MachineType::TaggedPointer());
if (!wasm::IsJSCompatibleSignature(sig_)) {
// Throw a TypeError.
BuildCallToRuntimeWithContext(Runtime::kWasmThrowTypeError,
native_context, nullptr, 0);
// We don't need to return a value here, as the runtime call will not
// return anyway (the c entry stub will trigger stack unwinding).
ReturnVoid();
return false;
}
CallDescriptor* call_descriptor;
Node** args = Buffer(wasm_count + 9);
Node* call = nullptr;
BuildModifyThreadInWasmFlag(false);
if (target->IsJSFunction()) {
Handle<JSFunction> function = Handle<JSFunction>::cast(target);
FieldAccess field_access = AccessBuilder::ForJSFunctionContext();
Node* function_context = SetEffect(graph()->NewNode(
mcgraph()->machine()->Load(MachineType::TaggedPointer()),
callable_node,
mcgraph()->Int32Constant(field_access.offset - field_access.tag()),
Effect(), Control()));
if (!IsClassConstructor(function->shared()->kind())) {
if (function->shared()->internal_formal_parameter_count() ==
wasm_count) {
int pos = 0;
args[pos++] = callable_node; // target callable.
// Receiver.
if (is_sloppy(function->shared()->language_mode()) &&
!function->shared()->native()) {
Node* global_proxy = LOAD_FIXED_ARRAY_SLOT(
native_context, Context::GLOBAL_PROXY_INDEX);
args[pos++] = global_proxy;
} else {
args[pos++] = undefined_node;
}
call_descriptor = Linkage::GetJSCallDescriptor(
graph()->zone(), false, wasm_count + 1, CallDescriptor::kNoFlags);
// Convert wasm numbers to JS values.
pos = AddArgumentNodes(args, pos, wasm_count, sig_);
args[pos++] = undefined_node; // new target
args[pos++] = mcgraph()->Int32Constant(wasm_count); // argument count
args[pos++] = function_context;
args[pos++] = Effect();
args[pos++] = Control();
call = graph()->NewNode(mcgraph()->common()->Call(call_descriptor),
pos, args);
} else if (function->shared()->internal_formal_parameter_count() >= 0) {
int pos = 0;
args[pos++] = mcgraph()->RelocatableIntPtrConstant(
wasm::WasmCode::kWasmArgumentsAdaptor, RelocInfo::WASM_STUB_CALL);
args[pos++] = callable_node; // target callable
args[pos++] = undefined_node; // new target
args[pos++] = mcgraph()->Int32Constant(wasm_count); // argument count
args[pos++] = mcgraph()->Int32Constant(
function->shared()->internal_formal_parameter_count());
// Receiver.
if (is_sloppy(function->shared()->language_mode()) &&
!function->shared()->native()) {
Node* global_proxy = LOAD_FIXED_ARRAY_SLOT(
native_context, Context::GLOBAL_PROXY_INDEX);
args[pos++] = global_proxy;
} else {
args[pos++] = undefined_node;
}
call_descriptor = Linkage::GetStubCallDescriptor(
mcgraph()->zone(), ArgumentAdaptorDescriptor{}, 1 + wasm_count,
CallDescriptor::kNoFlags, Operator::kNoProperties,
StubCallMode::kCallWasmRuntimeStub);
// Convert wasm numbers to JS values.
pos = AddArgumentNodes(args, pos, wasm_count, sig_);
args[pos++] = function_context;
args[pos++] = Effect();
args[pos++] = Control();
call = graph()->NewNode(mcgraph()->common()->Call(call_descriptor),
pos, args);
}
}
}
// We cannot call the target directly, we have to use the Call builtin.
if (!call) {
int pos = 0;
args[pos++] = mcgraph()->RelocatableIntPtrConstant(
wasm::WasmCode::kWasmCallJavaScript, RelocInfo::WASM_STUB_CALL);
args[pos++] = callable_node;
args[pos++] = mcgraph()->Int32Constant(wasm_count); // argument count
args[pos++] = undefined_node; // receiver
call_descriptor = Linkage::GetStubCallDescriptor(
graph()->zone(), CallTrampolineDescriptor{}, wasm_count + 1,
CallDescriptor::kNoFlags, Operator::kNoProperties,
StubCallMode::kCallWasmRuntimeStub);
// Convert wasm numbers to JS values.
pos = AddArgumentNodes(args, pos, wasm_count, sig_);
// The native_context is sufficient here, because all kind of callables
// which depend on the context provide their own context. The context here
// is only needed if the target is a constructor to throw a TypeError, if
// the target is a native function, or if the target is a callable
// JSObject, which can only be constructed by the runtime.
args[pos++] = native_context;
args[pos++] = Effect();
args[pos++] = Control();
call = graph()->NewNode(mcgraph()->common()->Call(call_descriptor), pos,
args);
}
SetEffect(call);
SetSourcePosition(call, 0);
// Convert the return value back.
Node* val = sig_->return_count() == 0
? mcgraph()->Int32Constant(0)
: FromJS(call, native_context, sig_->GetReturn());
BuildModifyThreadInWasmFlag(true);
Return(val);
return true;
}
void BuildWasmInterpreterEntry(uint32_t func_index) {
int param_count = static_cast<int>(sig_->parameter_count());
// Build the start and the parameter nodes.
SetEffect(SetControl(Start(param_count + 3)));
// Create the instance_node from the passed parameter.
instance_node_.set(Param(wasm::kWasmInstanceParameterIndex));
// Compute size for the argument buffer.
int args_size_bytes = 0;
for (wasm::ValueType type : sig_->parameters()) {
args_size_bytes += wasm::ValueTypes::ElementSizeInBytes(type);
}
// The return value is also passed via this buffer:
DCHECK_GE(wasm::kV8MaxWasmFunctionReturns, sig_->return_count());
// TODO(wasm): Handle multi-value returns.
DCHECK_EQ(1, wasm::kV8MaxWasmFunctionReturns);
int return_size_bytes =
sig_->return_count() == 0
? 0
: wasm::ValueTypes::ElementSizeInBytes(sig_->GetReturn());
// Get a stack slot for the arguments.
Node* arg_buffer =
args_size_bytes == 0 && return_size_bytes == 0
? mcgraph()->IntPtrConstant(0)
: graph()->NewNode(mcgraph()->machine()->StackSlot(
std::max(args_size_bytes, return_size_bytes), 8));
// Now store all our arguments to the buffer.
int offset = 0;
for (int i = 0; i < param_count; ++i) {
wasm::ValueType type = sig_->GetParam(i);
// Start from the parameter with index 1 to drop the instance_node.
SetEffect(graph()->NewNode(GetSafeStoreOperator(offset, type), arg_buffer,
Int32Constant(offset), Param(i + 1), Effect(),
Control()));
offset += wasm::ValueTypes::ElementSizeInBytes(type);
}
DCHECK_EQ(args_size_bytes, offset);
// We are passing the raw arg_buffer here. To the GC and other parts, it
// looks like a Smi (lowest bit not set). In the runtime function however,
// don't call Smi::value on it, but just cast it to a byte pointer.
Node* parameters[] = {
jsgraph()->SmiConstant(func_index), arg_buffer,
};
BuildCallToRuntime(Runtime::kWasmRunInterpreter, parameters,
arraysize(parameters));
// Read back the return value.
if (sig_->return_count() == 0) {
Return(Int32Constant(0));
} else {
// TODO(wasm): Implement multi-return.
DCHECK_EQ(1, sig_->return_count());
MachineType load_rep =
wasm::ValueTypes::MachineTypeFor(sig_->GetReturn());
Node* val = SetEffect(
graph()->NewNode(mcgraph()->machine()->Load(load_rep), arg_buffer,
Int32Constant(0), Effect(), Control()));
Return(val);
}
if (ContainsInt64(sig_)) LowerInt64();
}
void BuildCWasmEntry() {
// Build the start and the JS parameter nodes.
SetEffect(SetControl(Start(CWasmEntryParameters::kNumParameters + 5)));
// Create parameter nodes (offset by 1 for the receiver parameter).
Node* foreign_code_obj = Param(CWasmEntryParameters::kCodeObject + 1);
MachineOperatorBuilder* machine = mcgraph()->machine();
Node* code_obj = graph()->NewNode(
machine->Load(MachineType::Pointer()), foreign_code_obj,
Int32Constant(Foreign::kForeignAddressOffset - kHeapObjectTag),
Effect(), Control());
Node* instance_node = Param(CWasmEntryParameters::kWasmInstance + 1);
Node* arg_buffer = Param(CWasmEntryParameters::kArgumentsBuffer + 1);
int wasm_arg_count = static_cast<int>(sig_->parameter_count());
int arg_count = wasm_arg_count + 4; // code, instance_node, control, effect
Node** args = Buffer(arg_count);
int pos = 0;
args[pos++] = code_obj;
args[pos++] = instance_node;
int offset = 0;
for (wasm::ValueType type : sig_->parameters()) {
Node* arg_load = SetEffect(
graph()->NewNode(GetSafeLoadOperator(offset, type), arg_buffer,
Int32Constant(offset), Effect(), Control()));
args[pos++] = arg_load;
offset += wasm::ValueTypes::ElementSizeInBytes(type);
}
args[pos++] = Effect();
args[pos++] = Control();
DCHECK_EQ(arg_count, pos);
// Call the wasm code.
auto call_descriptor = GetWasmCallDescriptor(mcgraph()->zone(), sig_);
Node* call = SetEffect(graph()->NewNode(
mcgraph()->common()->Call(call_descriptor), arg_count, args));
// Store the return value.
DCHECK_GE(1, sig_->return_count());
if (sig_->return_count() == 1) {
StoreRepresentation store_rep(
wasm::ValueTypes::MachineRepresentationFor(sig_->GetReturn()),
kNoWriteBarrier);
SetEffect(graph()->NewNode(mcgraph()->machine()->Store(store_rep),
arg_buffer, Int32Constant(0), call, Effect(),
Control()));
}
Return(jsgraph()->SmiConstant(0));
if (mcgraph()->machine()->Is32() && ContainsInt64(sig_)) {
MachineRepresentation sig_reps[] = {
MachineRepresentation::kWord32, // return value
MachineRepresentation::kTagged, // receiver
MachineRepresentation::kTagged, // arg0 (code)
MachineRepresentation::kTagged // arg1 (buffer)
};
Signature<MachineRepresentation> c_entry_sig(1, 2, sig_reps);
Int64Lowering r(mcgraph()->graph(), mcgraph()->machine(),
mcgraph()->common(), mcgraph()->zone(), &c_entry_sig);
r.LowerGraph();
}
}
JSGraph* jsgraph() { return jsgraph_; }
private:
Isolate* const isolate_;
JSGraph* jsgraph_;
StubCallMode stub_mode_;
SetOncePointer<const Operator> allocate_heap_number_operator_;
};
} // namespace
MaybeHandle<Code> CompileJSToWasmWrapper(
Isolate* isolate, const wasm::NativeModule* native_module,
wasm::FunctionSig* sig, bool is_import,
wasm::UseTrapHandler use_trap_handler) {
TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.wasm"),
"CompileJSToWasmWrapper");
const wasm::WasmModule* module = native_module->module();
//----------------------------------------------------------------------------
// Create the Graph.
//----------------------------------------------------------------------------
Zone zone(isolate->allocator(), ZONE_NAME);
Graph graph(&zone);
CommonOperatorBuilder common(&zone);
MachineOperatorBuilder machine(
&zone, MachineType::PointerRepresentation(),
InstructionSelector::SupportedMachineOperatorFlags(),
InstructionSelector::AlignmentRequirements());
JSGraph jsgraph(isolate, &graph, &common, nullptr, nullptr, &machine);
Node* control = nullptr;
Node* effect = nullptr;
wasm::ModuleEnv env(module, use_trap_handler, wasm::kRuntimeExceptionSupport);
WasmWrapperGraphBuilder builder(&zone, &env, &jsgraph, sig, nullptr,
StubCallMode::kCallOnHeapBuiltin);
builder.set_control_ptr(&control);
builder.set_effect_ptr(&effect);
builder.BuildJSToWasmWrapper(is_import);
//----------------------------------------------------------------------------
// Run the compilation pipeline.
//----------------------------------------------------------------------------
#ifdef DEBUG
EmbeddedVector<char, 32> func_name;
static unsigned id = 0;
func_name.Truncate(SNPrintF(func_name, "js-to-wasm#%d", id++));
#else
Vector<const char> func_name = CStrVector("js-to-wasm");
#endif
OptimizedCompilationInfo info(func_name, &zone, Code::JS_TO_WASM_FUNCTION);
if (info.trace_turbo_graph_enabled()) { // Simple textual RPO.
StdoutStream{} << "-- Graph after change lowering -- " << std::endl
<< AsRPO(graph);
}
// Schedule and compile to machine code.
int params = static_cast<int>(sig->parameter_count());
CallDescriptor* incoming = Linkage::GetJSCallDescriptor(
&zone, false, params + 1, CallDescriptor::kNoFlags);
MaybeHandle<Code> maybe_code = Pipeline::GenerateCodeForTesting(
&info, isolate, incoming, &graph, WasmAssemblerOptions());
Handle<Code> code;
if (!maybe_code.ToHandle(&code)) {
return maybe_code;
}
#ifdef ENABLE_DISASSEMBLER
if (FLAG_print_opt_code) {
CodeTracer::Scope tracing_scope(isolate->GetCodeTracer());
OFStream os(tracing_scope.file());
code->Disassemble(func_name.start(), os);
}
#endif
if (must_record_function_compilation(isolate)) {
RecordFunctionCompilation(CodeEventListener::STUB_TAG, isolate, code,
"%.*s", func_name.length(), func_name.start());
}
return code;
}
MaybeHandle<Code> CompileWasmToJSWrapper(
Isolate* isolate, Handle<JSReceiver> target, wasm::FunctionSig* sig,
uint32_t index, wasm::ModuleOrigin origin,
wasm::UseTrapHandler use_trap_handler) {
TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.wasm"),
"CompileWasmToJSWrapper");
//----------------------------------------------------------------------------
// Create the Graph
//----------------------------------------------------------------------------
Zone zone(isolate->allocator(), ZONE_NAME);
Graph graph(&zone);
CommonOperatorBuilder common(&zone);
MachineOperatorBuilder machine(
&zone, MachineType::PointerRepresentation(),
InstructionSelector::SupportedMachineOperatorFlags(),
InstructionSelector::AlignmentRequirements());
JSGraph jsgraph(isolate, &graph, &common, nullptr, nullptr, &machine);
Node* control = nullptr;
Node* effect = nullptr;
SourcePositionTable* source_position_table =
origin == wasm::kAsmJsOrigin ? new (&zone) SourcePositionTable(&graph)
: nullptr;
wasm::ModuleEnv env(nullptr, use_trap_handler,
wasm::kRuntimeExceptionSupport);
WasmWrapperGraphBuilder builder(&zone, &env, &jsgraph, sig,
source_position_table,
StubCallMode::kCallWasmRuntimeStub);
builder.set_control_ptr(&control);
builder.set_effect_ptr(&effect);
builder.BuildWasmToJSWrapper(target, index);
#ifdef DEBUG
EmbeddedVector<char, 32> func_name;
static unsigned id = 0;
func_name.Truncate(SNPrintF(func_name, "wasm-to-js#%d", id++));
#else
Vector<const char> func_name = CStrVector("wasm-to-js");
#endif
OptimizedCompilationInfo info(func_name, &zone, Code::WASM_TO_JS_FUNCTION);
if (info.trace_turbo_graph_enabled()) { // Simple textual RPO.
StdoutStream{} << "-- Graph after change lowering -- " << std::endl
<< AsRPO(graph);
}
// Schedule and compile to machine code.
CallDescriptor* incoming = GetWasmCallDescriptor(&zone, sig);
if (machine.Is32()) {
incoming = GetI32WasmCallDescriptor(&zone, incoming);
}
MaybeHandle<Code> maybe_code = Pipeline::GenerateCodeForTesting(
&info, isolate, incoming, &graph, AssemblerOptions::Default(isolate),
nullptr, source_position_table);
Handle<Code> code;
if (!maybe_code.ToHandle(&code)) {
return maybe_code;
}
#ifdef ENABLE_DISASSEMBLER
if (FLAG_print_opt_code) {
CodeTracer::Scope tracing_scope(isolate->GetCodeTracer());
OFStream os(tracing_scope.file());
code->Disassemble(func_name.start(), os);
}
#endif
if (must_record_function_compilation(isolate)) {
RecordFunctionCompilation(CodeEventListener::STUB_TAG, isolate, code,
"%.*s", func_name.length(), func_name.start());
}
return code;
}
MaybeHandle<Code> CompileWasmInterpreterEntry(Isolate* isolate,
uint32_t func_index,
wasm::FunctionSig* sig) {
//----------------------------------------------------------------------------
// Create the Graph
//----------------------------------------------------------------------------
Zone zone(isolate->allocator(), ZONE_NAME);
Graph graph(&zone);
CommonOperatorBuilder common(&zone);
MachineOperatorBuilder machine(
&zone, MachineType::PointerRepresentation(),
InstructionSelector::SupportedMachineOperatorFlags(),
InstructionSelector::AlignmentRequirements());
JSGraph jsgraph(isolate, &graph, &common, nullptr, nullptr, &machine);
Node* control = nullptr;
Node* effect = nullptr;
WasmWrapperGraphBuilder builder(&zone, nullptr, &jsgraph, sig, nullptr,
StubCallMode::kCallWasmRuntimeStub);
builder.set_control_ptr(&control);
builder.set_effect_ptr(&effect);
builder.BuildWasmInterpreterEntry(func_index);
// Schedule and compile to machine code.
CallDescriptor* incoming = GetWasmCallDescriptor(&zone, sig);
if (machine.Is32()) {
incoming = GetI32WasmCallDescriptor(&zone, incoming);
}
#ifdef DEBUG
EmbeddedVector<char, 32> func_name;
func_name.Truncate(
SNPrintF(func_name, "wasm-interpreter-entry#%d", func_index));
#else
Vector<const char> func_name = CStrVector("wasm-interpreter-entry");
#endif
OptimizedCompilationInfo info(func_name, &zone, Code::WASM_INTERPRETER_ENTRY);
if (info.trace_turbo_graph_enabled()) { // Simple textual RPO.
StdoutStream{} << "-- Wasm interpreter entry graph -- " << std::endl
<< AsRPO(graph);
}
MaybeHandle<Code> maybe_code = Pipeline::GenerateCodeForTesting(
&info, isolate, incoming, &graph, AssemblerOptions::Default(isolate),
nullptr);
Handle<Code> code;
if (!maybe_code.ToHandle(&code)) {
return maybe_code;
}
#ifdef ENABLE_DISASSEMBLER
if (FLAG_print_opt_code) {
CodeTracer::Scope tracing_scope(isolate->GetCodeTracer());
OFStream os(tracing_scope.file());
code->Disassemble(func_name.start(), os);
}
#endif
if (must_record_function_compilation(isolate)) {
RecordFunctionCompilation(CodeEventListener::STUB_TAG, isolate, code,
"%.*s", func_name.length(), func_name.start());
}
return maybe_code;
}
MaybeHandle<Code> CompileCWasmEntry(Isolate* isolate, wasm::FunctionSig* sig) {
Zone zone(isolate->allocator(), ZONE_NAME);
Graph graph(&zone);
CommonOperatorBuilder common(&zone);
MachineOperatorBuilder machine(
&zone, MachineType::PointerRepresentation(),
InstructionSelector::SupportedMachineOperatorFlags(),
InstructionSelector::AlignmentRequirements());
JSGraph jsgraph(isolate, &graph, &common, nullptr, nullptr, &machine);
Node* control = nullptr;
Node* effect = nullptr;
WasmWrapperGraphBuilder builder(&zone, nullptr, &jsgraph, sig, nullptr,
StubCallMode::kCallOnHeapBuiltin);
builder.set_control_ptr(&control);
builder.set_effect_ptr(&effect);
builder.BuildCWasmEntry();
// Schedule and compile to machine code.
CallDescriptor* incoming = Linkage::GetJSCallDescriptor(
&zone, false, CWasmEntryParameters::kNumParameters + 1,
CallDescriptor::kNoFlags);
// Build a name in the form "c-wasm-entry:<params>:<returns>".
static constexpr size_t kMaxNameLen = 128;
char debug_name[kMaxNameLen] = "c-wasm-entry:";
size_t name_len = strlen(debug_name);
auto append_name_char = [&](char c) {
if (name_len + 1 < kMaxNameLen) debug_name[name_len++] = c;
};
for (wasm::ValueType t : sig->parameters()) {
append_name_char(wasm::ValueTypes::ShortNameOf(t));
}
append_name_char(':');
for (wasm::ValueType t : sig->returns()) {
append_name_char(wasm::ValueTypes::ShortNameOf(t));
}
debug_name[name_len] = '\0';
Vector<const char> debug_name_vec(debug_name, name_len);
OptimizedCompilationInfo info(debug_name_vec, &zone, Code::C_WASM_ENTRY);
if (info.trace_turbo_graph_enabled()) { // Simple textual RPO.
StdoutStream{} << "-- C Wasm entry graph -- " << std::endl << AsRPO(graph);
}
MaybeHandle<Code> maybe_code = Pipeline::GenerateCodeForTesting(
&info, isolate, incoming, &graph, AssemblerOptions::Default(isolate));
Handle<Code> code;
if (!maybe_code.ToHandle(&code)) {
return maybe_code;
}
#ifdef ENABLE_DISASSEMBLER
if (FLAG_print_opt_code) {
CodeTracer::Scope tracing_scope(isolate->GetCodeTracer());
OFStream os(tracing_scope.file());
code->Disassemble(debug_name, os);
}
#endif
return code;
}
TurbofanWasmCompilationUnit::TurbofanWasmCompilationUnit(
wasm::WasmCompilationUnit* wasm_unit)
: wasm_unit_(wasm_unit) {}
// Clears unique_ptrs, but (part of) the type is forward declared in the header.
TurbofanWasmCompilationUnit::~TurbofanWasmCompilationUnit() = default;
SourcePositionTable* TurbofanWasmCompilationUnit::BuildGraphForWasmFunction(
wasm::WasmFeatures* detected, double* decode_ms, MachineGraph* mcgraph,
NodeOriginTable* node_origins) {
base::ElapsedTimer decode_timer;
if (FLAG_trace_wasm_decode_time) {
decode_timer.Start();
}
// Create a TF graph during decoding.
SourcePositionTable* source_position_table =
new (mcgraph->zone()) SourcePositionTable(mcgraph->graph());
WasmGraphBuilder builder(wasm_unit_->env_, mcgraph->zone(), mcgraph,
wasm_unit_->func_body_.sig, source_position_table);
graph_construction_result_ = wasm::BuildTFGraph(
wasm_unit_->wasm_engine_->allocator(),
wasm_unit_->native_module_->enabled_features(), wasm_unit_->env_->module,
&builder, detected, wasm_unit_->func_body_, node_origins);
if (graph_construction_result_.failed()) {
if (FLAG_trace_wasm_compiler) {
StdoutStream{} << "Compilation failed: "
<< graph_construction_result_.error_msg() << std::endl;
}
return nullptr;
}
builder.LowerInt64();
if (builder.has_simd() &&
(!CpuFeatures::SupportsWasmSimd128() || wasm_unit_->env_->lower_simd)) {
SimdScalarLowering(
mcgraph,
CreateMachineSignature(mcgraph->zone(), wasm_unit_->func_body_.sig))
.LowerGraph();
}
if (wasm_unit_->func_index_ >= FLAG_trace_wasm_ast_start &&
wasm_unit_->func_index_ < FLAG_trace_wasm_ast_end) {
PrintRawWasmCode(wasm_unit_->wasm_engine_->allocator(),
wasm_unit_->func_body_, wasm_unit_->env_->module,
wasm::kPrintLocals);
}
if (FLAG_trace_wasm_decode_time) {
*decode_ms = decode_timer.Elapsed().InMillisecondsF();
}
return source_position_table;
}
namespace {
Vector<const char> GetDebugName(Zone* zone, wasm::WasmName name, int index) {
if (!name.is_empty()) {
return name;
}
#ifdef DEBUG
constexpr int kBufferLength = 15;
EmbeddedVector<char, kBufferLength> name_vector;
int name_len = SNPrintF(name_vector, "wasm#%d", index);
DCHECK(name_len > 0 && name_len < name_vector.length());
char* index_name = zone->NewArray<char>(name_len);
memcpy(index_name, name_vector.start(), name_len);
return Vector<const char>(index_name, name_len);
#else
return {};
#endif
}
} // namespace
void TurbofanWasmCompilationUnit::ExecuteCompilation(
wasm::WasmFeatures* detected) {
TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.wasm"),
"ExecuteTurbofanCompilation");
double decode_ms = 0;
size_t node_count = 0;
// Scope for the {graph_zone}.
{
Zone graph_zone(wasm_unit_->wasm_engine_->allocator(), ZONE_NAME);
MachineGraph* mcgraph = new (&graph_zone)
MachineGraph(new (&graph_zone) Graph(&graph_zone),
new (&graph_zone) CommonOperatorBuilder(&graph_zone),
new (&graph_zone) MachineOperatorBuilder(
&graph_zone, MachineType::PointerRepresentation(),
InstructionSelector::SupportedMachineOperatorFlags(),
InstructionSelector::AlignmentRequirements()));
Zone compilation_zone(wasm_unit_->wasm_engine_->allocator(), ZONE_NAME);
OptimizedCompilationInfo info(
GetDebugName(&compilation_zone, wasm_unit_->func_name_,
wasm_unit_->func_index_),
&compilation_zone, Code::WASM_FUNCTION);
if (wasm_unit_->env_->runtime_exception_support) {
info.SetWasmRuntimeExceptionSupport();
}
NodeOriginTable* node_origins = info.trace_turbo_json_enabled()
? new (&graph_zone)
NodeOriginTable(mcgraph->graph())
: nullptr;
SourcePositionTable* source_positions =
BuildGraphForWasmFunction(detected, &decode_ms, mcgraph, node_origins);
if (graph_construction_result_.failed()) {
ok_ = false;
return;
}
if (node_origins) {
node_origins->AddDecorator();
}
base::ElapsedTimer pipeline_timer;
if (FLAG_trace_wasm_decode_time) {
node_count = mcgraph->graph()->NodeCount();
pipeline_timer.Start();
}
// Run the compiler pipeline to generate machine code.
auto call_descriptor =
GetWasmCallDescriptor(&compilation_zone, wasm_unit_->func_body_.sig);
if (mcgraph->machine()->Is32()) {
call_descriptor =
GetI32WasmCallDescriptor(&compilation_zone, call_descriptor);
}
std::unique_ptr<OptimizedCompilationJob> job(
Pipeline::NewWasmCompilationJob(
&info, wasm_unit_->wasm_engine_, mcgraph, call_descriptor,
source_positions, node_origins, wasm_unit_->func_body_,
const_cast<wasm::WasmModule*>(wasm_unit_->env_->module),
wasm_unit_->native_module_, wasm_unit_->func_index_,
wasm_unit_->env_->module->origin));
ok_ = job->ExecuteJob() == CompilationJob::SUCCEEDED;
// TODO(bradnelson): Improve histogram handling of size_t.
wasm_unit_->counters_->wasm_compile_function_peak_memory_bytes()->AddSample(
static_cast<int>(mcgraph->graph()->zone()->allocation_size()));
if (FLAG_trace_wasm_decode_time) {
double pipeline_ms = pipeline_timer.Elapsed().InMillisecondsF();
PrintF(
"wasm-compilation phase 1 ok: %u bytes, %0.3f ms decode, %zu nodes, "
"%0.3f ms pipeline\n",
static_cast<unsigned>(wasm_unit_->func_body_.end -
wasm_unit_->func_body_.start),
decode_ms, node_count, pipeline_ms);
}
if (ok_) wasm_code_ = info.wasm_code();
}
if (ok_) wasm_unit_->native_module()->PublishCode(wasm_code_);
}
wasm::WasmCode* TurbofanWasmCompilationUnit::FinishCompilation(
wasm::ErrorThrower* thrower) {
if (!ok_) {
if (graph_construction_result_.failed()) {
// Add the function as another context for the exception.
EmbeddedVector<char, 128> message;
if (wasm_unit_->func_name_.start() == nullptr) {
SNPrintF(message, "Compiling wasm function #%d failed",
wasm_unit_->func_index_);
} else {
wasm::TruncatedUserString<> trunc_name(wasm_unit_->func_name_);
SNPrintF(message, "Compiling wasm function #%d:%.*s failed",
wasm_unit_->func_index_, trunc_name.length(),
trunc_name.start());
}
thrower->CompileFailed(message.start(), graph_construction_result_);
}
return nullptr;
}
return wasm_code_;
}
namespace {
// Helper for allocating either an GP or FP reg, or the next stack slot.
class LinkageLocationAllocator {
public:
template <size_t kNumGpRegs, size_t kNumFpRegs>
constexpr LinkageLocationAllocator(const Register (&gp)[kNumGpRegs],
const DoubleRegister (&fp)[kNumFpRegs])
: allocator_(wasm::LinkageAllocator(gp, fp)) {}
LinkageLocation Next(MachineRepresentation rep) {
MachineType type = MachineType::TypeForRepresentation(rep);
if (IsFloatingPoint(rep)) {
if (allocator_.CanAllocateFP(rep)) {
int reg_code = allocator_.NextFpReg(rep);
return LinkageLocation::ForRegister(reg_code, type);
}
} else if (allocator_.CanAllocateGP()) {
int reg_code = allocator_.NextGpReg();
return LinkageLocation::ForRegister(reg_code, type);
}
// Cannot use register; use stack slot.
int index = -1 - allocator_.NextStackSlot(rep);
return LinkageLocation::ForCallerFrameSlot(index, type);
}
void SetStackOffset(int offset) { allocator_.SetStackOffset(offset); }
int NumStackSlots() const { return allocator_.NumStackSlots(); }
private:
wasm::LinkageAllocator allocator_;
};
} // namespace
// General code uses the above configuration data.
CallDescriptor* GetWasmCallDescriptor(
Zone* zone, wasm::FunctionSig* fsig,
WasmGraphBuilder::UseRetpoline use_retpoline) {
// The '+ 1' here is to accomodate the instance object as first parameter.
LocationSignature::Builder locations(zone, fsig->return_count(),
fsig->parameter_count() + 1);
// Add register and/or stack parameter(s).
LinkageLocationAllocator params(wasm::kGpParamRegisters,
wasm::kFpParamRegisters);
// The instance object.
locations.AddParam(params.Next(MachineRepresentation::kTaggedPointer));
const int parameter_count = static_cast<int>(fsig->parameter_count());
for (int i = 0; i < parameter_count; i++) {
MachineRepresentation param =
wasm::ValueTypes::MachineRepresentationFor(fsig->GetParam(i));
auto l = params.Next(param);
locations.AddParam(l);
}
// Add return location(s).
LinkageLocationAllocator rets(wasm::kGpReturnRegisters,
wasm::kFpReturnRegisters);
int parameter_slots = params.NumStackSlots();
if (kPadArguments) parameter_slots = RoundUp(parameter_slots, 2);
rets.SetStackOffset(parameter_slots);
const int return_count = static_cast<int>(locations.return_count_);
for (int i = 0; i < return_count; i++) {
MachineRepresentation ret =
wasm::ValueTypes::MachineRepresentationFor(fsig->GetReturn(i));
auto l = rets.Next(ret);
locations.AddReturn(l);
}
const RegList kCalleeSaveRegisters = 0;
const RegList kCalleeSaveFPRegisters = 0;
// The target for wasm calls is always a code object.
MachineType target_type = MachineType::Pointer();
LinkageLocation target_loc = LinkageLocation::ForAnyRegister(target_type);
CallDescriptor::Kind kind = CallDescriptor::kCallWasmFunction;
CallDescriptor::Flags flags =
use_retpoline ? CallDescriptor::kRetpoline : CallDescriptor::kNoFlags;
return new (zone) CallDescriptor( // --
kind, // kind
target_type, // target MachineType
target_loc, // target location
locations.Build(), // location_sig
parameter_slots, // stack_parameter_count
compiler::Operator::kNoProperties, // properties
kCalleeSaveRegisters, // callee-saved registers
kCalleeSaveFPRegisters, // callee-saved fp regs
flags, // flags
"wasm-call", // debug name
0, // allocatable registers
rets.NumStackSlots() - parameter_slots); // stack_return_count
}
namespace {
CallDescriptor* ReplaceTypeInCallDescriptorWith(
Zone* zone, CallDescriptor* call_descriptor, size_t num_replacements,
MachineType input_type, MachineRepresentation output_type) {
size_t parameter_count = call_descriptor->ParameterCount();
size_t return_count = call_descriptor->ReturnCount();
for (size_t i = 0; i < call_descriptor->ParameterCount(); i++) {
if (call_descriptor->GetParameterType(i) == input_type) {
parameter_count += num_replacements - 1;
}
}
for (size_t i = 0; i < call_descriptor->ReturnCount(); i++) {
if (call_descriptor->GetReturnType(i) == input_type) {
return_count += num_replacements - 1;
}
}
if (parameter_count == call_descriptor->ParameterCount() &&
return_count == call_descriptor->ReturnCount()) {
return call_descriptor;
}
LocationSignature::Builder locations(zone, return_count, parameter_count);
LinkageLocationAllocator params(wasm::kGpParamRegisters,
wasm::kFpParamRegisters);
for (size_t i = 0; i < call_descriptor->ParameterCount(); i++) {
if (call_descriptor->GetParameterType(i) == input_type) {
for (size_t j = 0; j < num_replacements; j++) {
locations.AddParam(params.Next(output_type));
}
} else {
locations.AddParam(
params.Next(call_descriptor->GetParameterType(i).representation()));
}
}
LinkageLocationAllocator rets(wasm::kGpReturnRegisters,
wasm::kFpReturnRegisters);
rets.SetStackOffset(params.NumStackSlots());
for (size_t i = 0; i < call_descriptor->ReturnCount(); i++) {
if (call_descriptor->GetReturnType(i) == input_type) {
for (size_t j = 0; j < num_replacements; j++) {
locations.AddReturn(rets.Next(output_type));
}
} else {
locations.AddReturn(
rets.Next(call_descriptor->GetReturnType(i).representation()));
}
}
return new (zone) CallDescriptor( // --
call_descriptor->kind(), // kind
call_descriptor->GetInputType(0), // target MachineType
call_descriptor->GetInputLocation(0), // target location
locations.Build(), // location_sig
params.NumStackSlots(), // stack_parameter_count
call_descriptor->properties(), // properties
call_descriptor->CalleeSavedRegisters(), // callee-saved registers
call_descriptor->CalleeSavedFPRegisters(), // callee-saved fp regs
call_descriptor->flags(), // flags
call_descriptor->debug_name(), // debug name
call_descriptor->AllocatableRegisters(), // allocatable registers
rets.NumStackSlots() - params.NumStackSlots()); // stack_return_count
}
} // namespace
CallDescriptor* GetI32WasmCallDescriptor(Zone* zone,
CallDescriptor* call_descriptor) {
return ReplaceTypeInCallDescriptorWith(zone, call_descriptor, 2,
MachineType::Int64(),
MachineRepresentation::kWord32);
}
CallDescriptor* GetI32WasmCallDescriptorForSimd(
Zone* zone, CallDescriptor* call_descriptor) {
return ReplaceTypeInCallDescriptorWith(zone, call_descriptor, 4,
MachineType::Simd128(),
MachineRepresentation::kWord32);
}
AssemblerOptions WasmAssemblerOptions() {
AssemblerOptions options;
options.record_reloc_info_for_serialization = true;
options.enable_root_array_delta_access = false;
return options;
}
#undef WASM_64
#undef FATAL_UNSUPPORTED_OPCODE
#undef WASM_INSTANCE_OBJECT_OFFSET
#undef LOAD_INSTANCE_FIELD
#undef LOAD_FIXED_ARRAY_SLOT
} // namespace compiler
} // namespace internal
} // namespace v8