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//===-- llvm-lto2: test harness for the resolution-based LTO interface ----===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This program takes in a list of bitcode files, links them and performs
// link-time optimization according to the provided symbol resolutions using the
// resolution-based LTO interface, and outputs one or more object files.
//
// This program is intended to eventually replace llvm-lto which uses the legacy
// LTO interface.
//
//===----------------------------------------------------------------------===//
#include "llvm/LTO/LTO.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/TargetSelect.h"
using namespace llvm;
using namespace lto;
using namespace object;
static cl::list<std::string> InputFilenames(cl::Positional, cl::OneOrMore,
cl::desc("<input bitcode files>"));
static cl::opt<std::string> OutputFilename("o", cl::Required,
cl::desc("Output filename"),
cl::value_desc("filename"));
static cl::opt<bool> SaveTemps("save-temps", cl::desc("Save temporary files"));
static cl::list<std::string> SymbolResolutions(
"r",
cl::desc("Specify a symbol resolution: filename,symbolname,resolution\n"
"where \"resolution\" is a sequence (which may be empty) of the\n"
"following characters:\n"
" p - prevailing: the linker has chosen this definition of the\n"
" symbol\n"
" l - local: the definition of this symbol is unpreemptable at\n"
" runtime and is known to be in this linkage unit\n"
" x - externally visible: the definition of this symbol is\n"
" visible outside of the LTO unit\n"
"A resolution for each symbol must be specified."),
cl::ZeroOrMore);
static void check(Error E, std::string Msg) {
if (!E)
return;
handleAllErrors(std::move(E), [&](ErrorInfoBase &EIB) {
errs() << "llvm-lto: " << Msg << ": " << EIB.message().c_str() << '\n';
});
exit(1);
}
template <typename T> static T check(Expected<T> E, std::string Msg) {
if (E)
return std::move(*E);
check(E.takeError(), Msg);
return T();
}
static void check(std::error_code EC, std::string Msg) {
check(errorCodeToError(EC), Msg);
}
template <typename T> static T check(ErrorOr<T> E, std::string Msg) {
if (E)
return std::move(*E);
check(E.getError(), Msg);
return T();
}
namespace {
// Define the LTOOutput handling
class LTOOutput : public lto::NativeObjectOutput {
StringRef Path;
public:
LTOOutput(StringRef Path) : Path(Path) {}
std::unique_ptr<raw_pwrite_stream> getStream() override {
std::error_code EC;
auto S = llvm::make_unique<raw_fd_ostream>(Path, EC, sys::fs::F_None);
check(EC, Path);
return std::move(S);
}
};
}
int main(int argc, char **argv) {
InitializeAllTargets();
InitializeAllTargetMCs();
InitializeAllAsmPrinters();
InitializeAllAsmParsers();
cl::ParseCommandLineOptions(argc, argv, "Resolution-based LTO test harness");
std::map<std::pair<std::string, std::string>, SymbolResolution>
CommandLineResolutions;
for (std::string R : SymbolResolutions) {
StringRef Rest = R;
StringRef FileName, SymbolName;
std::tie(FileName, Rest) = Rest.split(',');
if (Rest.empty()) {
llvm::errs() << "invalid resolution: " << R << '\n';
return 1;
}
std::tie(SymbolName, Rest) = Rest.split(',');
SymbolResolution Res;
for (char C : Rest) {
if (C == 'p')
Res.Prevailing = true;
else if (C == 'l')
Res.FinalDefinitionInLinkageUnit = true;
else if (C == 'x')
Res.VisibleToRegularObj = true;
else
llvm::errs() << "invalid character " << C << " in resolution: " << R
<< '\n';
}
CommandLineResolutions[{FileName, SymbolName}] = Res;
}
std::vector<std::unique_ptr<MemoryBuffer>> MBs;
Config Conf;
Conf.DiagHandler = [](const DiagnosticInfo &) {
exit(1);
};
if (SaveTemps)
check(Conf.addSaveTemps(OutputFilename), "Config::addSaveTemps failed");
LTO Lto(std::move(Conf));
bool HasErrors = false;
for (std::string F : InputFilenames) {
std::unique_ptr<MemoryBuffer> MB = check(MemoryBuffer::getFile(F), F);
std::unique_ptr<InputFile> Input =
check(InputFile::create(MB->getMemBufferRef()), F);
std::vector<SymbolResolution> Res;
for (const InputFile::Symbol &Sym : Input->symbols()) {
auto I = CommandLineResolutions.find({F, Sym.getName()});
if (I == CommandLineResolutions.end()) {
llvm::errs() << argv[0] << ": missing symbol resolution for " << F
<< ',' << Sym.getName() << '\n';
HasErrors = true;
} else {
Res.push_back(I->second);
CommandLineResolutions.erase(I);
}
}
if (HasErrors)
continue;
MBs.push_back(std::move(MB));
check(Lto.add(std::move(Input), Res), F);
}
if (!CommandLineResolutions.empty()) {
HasErrors = true;
for (auto UnusedRes : CommandLineResolutions)
llvm::errs() << argv[0] << ": unused symbol resolution for "
<< UnusedRes.first.first << ',' << UnusedRes.first.second
<< '\n';
}
if (HasErrors)
return 1;
auto AddOutput = [&](size_t Task) {
std::string Path = OutputFilename + "." + utostr(Task);
return llvm::make_unique<LTOOutput>(Path);
};
check(Lto.run(AddOutput), "LTO::run failed");
}
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