本文整理汇总了C++中LTOCodeGenerator::optimize方法的典型用法代码示例。如果您正苦于以下问题：C++ LTOCodeGenerator::optimize方法的具体用法？C++ LTOCodeGenerator::optimize怎么用？C++ LTOCodeGenerator::optimize使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类LTOCodeGenerator的用法示例。
在下文中一共展示了LTOCodeGenerator::optimize方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: main
//.........这里部分代码省略.........
unsigned NumSyms = Module->getSymbolCount();
for (unsigned I = 0; I < NumSyms; ++I) {
StringRef Name = Module->getSymbolName(I);
if (!DSOSymbolsSet.count(Name))
continue;
lto_symbol_attributes Attrs = Module->getSymbolAttributes(I);
unsigned Scope = Attrs & LTO_SYMBOL_SCOPE_MASK;
if (Scope != LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN)
KeptDSOSyms.push_back(Name);
}
// We use the first input module as the destination module when
// SetMergedModule is true.
if (SetMergedModule && i == BaseArg) {
// Transfer ownership to the code generator.
CodeGen.setModule(std::move(Module));
} else if (!CodeGen.addModule(Module.get())) {
// Print a message here so that we know addModule() did not abort.
errs() << argv[0] << ": error adding file '" << InputFilenames[i] << "'\n";
return 1;
}
}
// Add all the exported symbols to the table of symbols to preserve.
for (unsigned i = 0; i < ExportedSymbols.size(); ++i)
CodeGen.addMustPreserveSymbol(ExportedSymbols[i].c_str());
// Add all the dso symbols to the table of symbols to expose.
for (unsigned i = 0; i < KeptDSOSyms.size(); ++i)
CodeGen.addMustPreserveSymbol(KeptDSOSyms[i].c_str());
// Set cpu and attrs strings for the default target/subtarget.
CodeGen.setCpu(MCPU.c_str());
CodeGen.setOptLevel(OptLevel - '0');
std::string attrs;
for (unsigned i = 0; i < MAttrs.size(); ++i) {
if (i > 0)
attrs.append(",");
attrs.append(MAttrs[i]);
}
if (!attrs.empty())
CodeGen.setAttr(attrs.c_str());
if (!OutputFilename.empty()) {
std::string ErrorInfo;
if (!CodeGen.optimize(DisableVerify, DisableInline, DisableGVNLoadPRE,
DisableLTOVectorization, ErrorInfo)) {
errs() << argv[0] << ": error optimizing the code: " << ErrorInfo << "\n";
return 1;
}
std::list<tool_output_file> OSs;
std::vector<raw_pwrite_stream *> OSPtrs;
for (unsigned I = 0; I != Parallelism; ++I) {
std::string PartFilename = OutputFilename;
if (Parallelism != 1)
PartFilename += "." + utostr(I);
std::error_code EC;
OSs.emplace_back(PartFilename, EC, sys::fs::F_None);
if (EC) {
errs() << argv[0] << ": error opening the file '" << PartFilename
<< "': " << EC.message() << "\n";
return 1;
}
OSPtrs.push_back(&OSs.back().os());
}
if (!CodeGen.compileOptimized(OSPtrs, ErrorInfo)) {
errs() << argv[0] << ": error compiling the code: " << ErrorInfo << "\n";
return 1;
}
for (tool_output_file &OS : OSs)
OS.keep();
} else {
if (Parallelism != 1) {
errs() << argv[0] << ": -j must be specified together with -o\n";
return 1;
}
std::string ErrorInfo;
const char *OutputName = nullptr;
if (!CodeGen.compile_to_file(&OutputName, DisableVerify, DisableInline,
DisableGVNLoadPRE, DisableLTOVectorization,
ErrorInfo)) {
errs() << argv[0]
<< ": error compiling the code: " << ErrorInfo
<< "\n";
return 1;
}
outs() << "Wrote native object file '" << OutputName << "'\n";
}
return 0;
}