/*
* Copyright 2012, The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "bcc/Renderscript/RSCompiler.h"
#include <llvm/IR/Module.h>
#include <llvm/PassManager.h>
#include <llvm/Transforms/IPO.h>
#include "bcc/Assert.h"
#include "bcc/Renderscript/RSExecutable.h"
#include "bcc/Renderscript/RSScript.h"
#include "bcc/Renderscript/RSTransforms.h"
#include "bcc/Source.h"
#include "bcc/Support/Log.h"
#include "bcinfo/MetadataExtractor.h"
using namespace bcc;
bool RSCompiler::addInternalizeSymbolsPass(Script &pScript, llvm::PassManager &pPM) {
// Add a pass to internalize the symbols that don't need to have global
// visibility.
RSScript &script = static_cast<RSScript &>(pScript);
llvm::Module &module = script.getSource().getModule();
bcinfo::MetadataExtractor me(&module);
if (!me.extract()) {
bccAssert(false && "Could not extract metadata for module!");
return false;
}
// The vector contains the symbols that should not be internalized.
std::vector<const char *> export_symbols;
// Special RS functions should always be global symbols.
const char **special_functions = RSExecutable::SpecialFunctionNames;
while (*special_functions != NULL) {
export_symbols.push_back(*special_functions);
special_functions++;
}
// Visibility of symbols appeared in rs_export_var and rs_export_func should
// also be preserved.
size_t exportVarCount = me.getExportVarCount();
size_t exportFuncCount = me.getExportFuncCount();
size_t exportForEachCount = me.getExportForEachSignatureCount();
const char **exportVarNameList = me.getExportVarNameList();
const char **exportFuncNameList = me.getExportFuncNameList();
const char **exportForEachNameList = me.getExportForEachNameList();
size_t i;
for (i = 0; i < exportVarCount; ++i) {
export_symbols.push_back(exportVarNameList[i]);
}
for (i = 0; i < exportFuncCount; ++i) {
export_symbols.push_back(exportFuncNameList[i]);
}
// Expanded foreach functions should not be internalized, too.
// expanded_foreach_funcs keeps the .expand version of the kernel names
// around until createInternalizePass() is finished making its own
// copy of the visible symbols.
std::vector<std::string> expanded_foreach_funcs;
for (i = 0; i < exportForEachCount; ++i) {
expanded_foreach_funcs.push_back(
std::string(exportForEachNameList[i]) + ".expand");
}
for (i = 0; i < exportForEachCount; i++) {
export_symbols.push_back(expanded_foreach_funcs[i].c_str());
}
pPM.add(llvm::createInternalizePass(export_symbols));
return true;
}
bool RSCompiler::addExpandForEachPass(Script &pScript, llvm::PassManager &pPM) {
// Script passed to RSCompiler must be a RSScript.
RSScript &script = static_cast<RSScript &>(pScript);
// Expand ForEach on CPU path to reduce launch overhead.
bool pEnableStepOpt = true;
pPM.add(createRSForEachExpandPass(pEnableStepOpt));
if (script.getEmbedInfo())
pPM.add(createRSEmbedInfoPass());
return true;
}
bool RSCompiler::beforeAddLTOPasses(Script &pScript, llvm::PassManager &pPM) {
if (!addExpandForEachPass(pScript, pPM))
return false;
if (!addInternalizeSymbolsPass(pScript, pPM))
return false;
return true;
}