//===-- llvm/LLVMContext.h - Class for managing "global" state --*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares LLVMContext, a container of "global" state in LLVM, such
// as the global type and constant uniquing tables.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_IR_LLVMCONTEXT_H
#define LLVM_IR_LLVMCONTEXT_H
#include "llvm-c/Types.h"
#include "llvm/Support/CBindingWrapping.h"
#include "llvm/Support/Options.h"
#include <cstdint>
#include <memory>
#include <string>
namespace llvm {
class DiagnosticInfo;
enum DiagnosticSeverity : char;
class Function;
class Instruction;
class LLVMContextImpl;
class Module;
class OptBisect;
template <typename T> class SmallVectorImpl;
class SMDiagnostic;
class StringRef;
class Twine;
namespace yaml {
class Output;
} // end namespace yaml
/// This is an important class for using LLVM in a threaded context. It
/// (opaquely) owns and manages the core "global" data of LLVM's core
/// infrastructure, including the type and constant uniquing tables.
/// LLVMContext itself provides no locking guarantees, so you should be careful
/// to have one context per thread.
class LLVMContext {
public:
LLVMContextImpl *const pImpl;
LLVMContext();
LLVMContext(LLVMContext &) = delete;
LLVMContext &operator=(const LLVMContext &) = delete;
~LLVMContext();
// Pinned metadata names, which always have the same value. This is a
// compile-time performance optimization, not a correctness optimization.
enum {
MD_dbg = 0, // "dbg"
MD_tbaa = 1, // "tbaa"
MD_prof = 2, // "prof"
MD_fpmath = 3, // "fpmath"
MD_range = 4, // "range"
MD_tbaa_struct = 5, // "tbaa.struct"
MD_invariant_load = 6, // "invariant.load"
MD_alias_scope = 7, // "alias.scope"
MD_noalias = 8, // "noalias",
MD_nontemporal = 9, // "nontemporal"
MD_mem_parallel_loop_access = 10, // "llvm.mem.parallel_loop_access"
MD_nonnull = 11, // "nonnull"
MD_dereferenceable = 12, // "dereferenceable"
MD_dereferenceable_or_null = 13, // "dereferenceable_or_null"
MD_make_implicit = 14, // "make.implicit"
MD_unpredictable = 15, // "unpredictable"
MD_invariant_group = 16, // "invariant.group"
MD_align = 17, // "align"
MD_loop = 18, // "llvm.loop"
MD_type = 19, // "type"
MD_section_prefix = 20, // "section_prefix"
MD_absolute_symbol = 21, // "absolute_symbol"
};
/// Known operand bundle tag IDs, which always have the same value. All
/// operand bundle tags that LLVM has special knowledge of are listed here.
/// Additionally, this scheme allows LLVM to efficiently check for specific
/// operand bundle tags without comparing strings.
enum {
OB_deopt = 0, // "deopt"
OB_funclet = 1, // "funclet"
OB_gc_transition = 2, // "gc-transition"
};
/// getMDKindID - Return a unique non-zero ID for the specified metadata kind.
/// This ID is uniqued across modules in the current LLVMContext.
unsigned getMDKindID(StringRef Name) const;
/// getMDKindNames - Populate client supplied SmallVector with the name for
/// custom metadata IDs registered in this LLVMContext.
void getMDKindNames(SmallVectorImpl<StringRef> &Result) const;
/// getOperandBundleTags - Populate client supplied SmallVector with the
/// bundle tags registered in this LLVMContext. The bundle tags are ordered
/// by increasing bundle IDs.
/// \see LLVMContext::getOperandBundleTagID
void getOperandBundleTags(SmallVectorImpl<StringRef> &Result) const;
/// getOperandBundleTagID - Maps a bundle tag to an integer ID. Every bundle
/// tag registered with an LLVMContext has an unique ID.
uint32_t getOperandBundleTagID(StringRef Tag) const;
/// Define the GC for a function
void setGC(const Function &Fn, std::string GCName);
/// Return the GC for a function
const std::string &getGC(const Function &Fn);
/// Remove the GC for a function
void deleteGC(const Function &Fn);
/// Return true if the Context runtime configuration is set to discard all
/// value names. When true, only GlobalValue names will be available in the
/// IR.
bool shouldDiscardValueNames() const;
/// Set the Context runtime configuration to discard all value name (but
/// GlobalValue). Clients can use this flag to save memory and runtime,
/// especially in release mode.
void setDiscardValueNames(bool Discard);
/// Whether there is a string map for uniquing debug info
/// identifiers across the context. Off by default.
bool isODRUniquingDebugTypes() const;
void enableDebugTypeODRUniquing();
void disableDebugTypeODRUniquing();
typedef void (*InlineAsmDiagHandlerTy)(const SMDiagnostic&, void *Context,
unsigned LocCookie);
/// Defines the type of a diagnostic handler.
/// \see LLVMContext::setDiagnosticHandler.
/// \see LLVMContext::diagnose.
typedef void (*DiagnosticHandlerTy)(const DiagnosticInfo &DI, void *Context);
/// Defines the type of a yield callback.
/// \see LLVMContext::setYieldCallback.
typedef void (*YieldCallbackTy)(LLVMContext *Context, void *OpaqueHandle);
/// setInlineAsmDiagnosticHandler - This method sets a handler that is invoked
/// when problems with inline asm are detected by the backend. The first
/// argument is a function pointer and the second is a context pointer that
/// gets passed into the DiagHandler.
///
/// LLVMContext doesn't take ownership or interpret either of these
/// pointers.
void setInlineAsmDiagnosticHandler(InlineAsmDiagHandlerTy DiagHandler,
void *DiagContext = nullptr);
/// getInlineAsmDiagnosticHandler - Return the diagnostic handler set by
/// setInlineAsmDiagnosticHandler.
InlineAsmDiagHandlerTy getInlineAsmDiagnosticHandler() const;
/// getInlineAsmDiagnosticContext - Return the diagnostic context set by
/// setInlineAsmDiagnosticHandler.
void *getInlineAsmDiagnosticContext() const;
/// setDiagnosticHandler - This method sets a handler that is invoked
/// when the backend needs to report anything to the user. The first
/// argument is a function pointer and the second is a context pointer that
/// gets passed into the DiagHandler. The third argument should be set to
/// true if the handler only expects enabled diagnostics.
///
/// LLVMContext doesn't take ownership or interpret either of these
/// pointers.
void setDiagnosticHandler(DiagnosticHandlerTy DiagHandler,
void *DiagContext = nullptr,
bool RespectFilters = false);
/// getDiagnosticHandler - Return the diagnostic handler set by
/// setDiagnosticHandler.
DiagnosticHandlerTy getDiagnosticHandler() const;
/// getDiagnosticContext - Return the diagnostic context set by
/// setDiagnosticContext.
void *getDiagnosticContext() const;
/// \brief Return if a code hotness metric should be included in optimization
/// diagnostics.
bool getDiagnosticHotnessRequested() const;
/// \brief Set if a code hotness metric should be included in optimization
/// diagnostics.
void setDiagnosticHotnessRequested(bool Requested);
/// \brief Return the YAML file used by the backend to save optimization
/// diagnostics. If null, diagnostics are not saved in a file but only
/// emitted via the diagnostic handler.
yaml::Output *getDiagnosticsOutputFile();
/// Set the diagnostics output file used for optimization diagnostics.
///
/// By default or if invoked with null, diagnostics are not saved in a file
/// but only emitted via the diagnostic handler. Even if an output file is
/// set, the handler is invoked for each diagnostic message.
void setDiagnosticsOutputFile(std::unique_ptr<yaml::Output> F);
/// \brief Get the prefix that should be printed in front of a diagnostic of
/// the given \p Severity
static const char *getDiagnosticMessagePrefix(DiagnosticSeverity Severity);
/// \brief Report a message to the currently installed diagnostic handler.
///
/// This function returns, in particular in the case of error reporting
/// (DI.Severity == \a DS_Error), so the caller should leave the compilation
/// process in a self-consistent state, even though the generated code
/// need not be correct.
///
/// The diagnostic message will be implicitly prefixed with a severity keyword
/// according to \p DI.getSeverity(), i.e., "error: " for \a DS_Error,
/// "warning: " for \a DS_Warning, and "note: " for \a DS_Note.
void diagnose(const DiagnosticInfo &DI);
/// \brief Registers a yield callback with the given context.
///
/// The yield callback function may be called by LLVM to transfer control back
/// to the client that invoked the LLVM compilation. This can be used to yield
/// control of the thread, or perform periodic work needed by the client.
/// There is no guaranteed frequency at which callbacks must occur; in fact,
/// the client is not guaranteed to ever receive this callback. It is at the
/// sole discretion of LLVM to do so and only if it can guarantee that
/// suspending the thread won't block any forward progress in other LLVM
/// contexts in the same process.
///
/// At a suspend point, the state of the current LLVM context is intentionally
/// undefined. No assumptions about it can or should be made. Only LLVM
/// context API calls that explicitly state that they can be used during a
/// yield callback are allowed to be used. Any other API calls into the
/// context are not supported until the yield callback function returns
/// control to LLVM. Other LLVM contexts are unaffected by this restriction.
void setYieldCallback(YieldCallbackTy Callback, void *OpaqueHandle);
/// \brief Calls the yield callback (if applicable).
///
/// This transfers control of the current thread back to the client, which may
/// suspend the current thread. Only call this method when LLVM doesn't hold
/// any global mutex or cannot block the execution in another LLVM context.
void yield();
/// emitError - Emit an error message to the currently installed error handler
/// with optional location information. This function returns, so code should
/// be prepared to drop the erroneous construct on the floor and "not crash".
/// The generated code need not be correct. The error message will be
/// implicitly prefixed with "error: " and should not end with a ".".
void emitError(unsigned LocCookie, const Twine &ErrorStr);
void emitError(const Instruction *I, const Twine &ErrorStr);
void emitError(const Twine &ErrorStr);
/// \brief Query for a debug option's value.
///
/// This function returns typed data populated from command line parsing.
template <typename ValT, typename Base, ValT(Base::*Mem)>
ValT getOption() const {
return OptionRegistry::instance().template get<ValT, Base, Mem>();
}
/// \brief Access the object which manages optimization bisection for failure
/// analysis.
OptBisect &getOptBisect();
private:
// Module needs access to the add/removeModule methods.
friend class Module;
/// addModule - Register a module as being instantiated in this context. If
/// the context is deleted, the module will be deleted as well.
void addModule(Module*);
/// removeModule - Unregister a module from this context.
void removeModule(Module*);
};
// Create wrappers for C Binding types (see CBindingWrapping.h).
DEFINE_SIMPLE_CONVERSION_FUNCTIONS(LLVMContext, LLVMContextRef)
/* Specialized opaque context conversions.
*/
inline LLVMContext **unwrap(LLVMContextRef* Tys) {
return reinterpret_cast<LLVMContext**>(Tys);
}
inline LLVMContextRef *wrap(const LLVMContext **Tys) {
return reinterpret_cast<LLVMContextRef*>(const_cast<LLVMContext**>(Tys));
}
} // end namespace llvm
#endif // LLVM_IR_LLVMCONTEXT_H