You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
519 lines
17 KiB
519 lines
17 KiB
//===-- llc.cpp - Implement the LLVM Native Code Generator ----------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This is the llc code generator driver. It provides a convenient
|
|
// command-line interface for generating native assembly-language code
|
|
// or C code, given LLVM bitcode.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
|
|
#include "llvm/ADT/STLExtras.h"
|
|
#include "llvm/ADT/Triple.h"
|
|
#include "llvm/Analysis/TargetLibraryInfo.h"
|
|
#include "llvm/CodeGen/CommandFlags.h"
|
|
#include "llvm/CodeGen/LinkAllAsmWriterComponents.h"
|
|
#include "llvm/CodeGen/LinkAllCodegenComponents.h"
|
|
#include "llvm/CodeGen/MIRParser/MIRParser.h"
|
|
#include "llvm/CodeGen/MachineFunctionPass.h"
|
|
#include "llvm/CodeGen/MachineModuleInfo.h"
|
|
#include "llvm/CodeGen/TargetPassConfig.h"
|
|
#include "llvm/IR/DataLayout.h"
|
|
#include "llvm/IR/DiagnosticInfo.h"
|
|
#include "llvm/IR/DiagnosticPrinter.h"
|
|
#include "llvm/IR/IRPrintingPasses.h"
|
|
#include "llvm/IR/LLVMContext.h"
|
|
#include "llvm/IR/LegacyPassManager.h"
|
|
#include "llvm/IR/Module.h"
|
|
#include "llvm/IR/Verifier.h"
|
|
#include "llvm/IRReader/IRReader.h"
|
|
#include "llvm/MC/SubtargetFeature.h"
|
|
#include "llvm/Pass.h"
|
|
#include "llvm/Support/CommandLine.h"
|
|
#include "llvm/Support/Debug.h"
|
|
#include "llvm/Support/FileSystem.h"
|
|
#include "llvm/Support/FormattedStream.h"
|
|
#include "llvm/Support/Host.h"
|
|
#include "llvm/Support/ManagedStatic.h"
|
|
#include "llvm/Support/PluginLoader.h"
|
|
#include "llvm/Support/PrettyStackTrace.h"
|
|
#include "llvm/Support/Signals.h"
|
|
#include "llvm/Support/SourceMgr.h"
|
|
#include "llvm/Support/TargetRegistry.h"
|
|
#include "llvm/Support/TargetSelect.h"
|
|
#include "llvm/Support/ToolOutputFile.h"
|
|
#include "llvm/Target/TargetMachine.h"
|
|
#include "llvm/Target/TargetSubtargetInfo.h"
|
|
#include "llvm/Transforms/Utils/Cloning.h"
|
|
#include <memory>
|
|
using namespace llvm;
|
|
|
|
// General options for llc. Other pass-specific options are specified
|
|
// within the corresponding llc passes, and target-specific options
|
|
// and back-end code generation options are specified with the target machine.
|
|
//
|
|
static cl::opt<std::string>
|
|
InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-"));
|
|
|
|
static cl::opt<std::string>
|
|
OutputFilename("o", cl::desc("Output filename"), cl::value_desc("filename"));
|
|
|
|
static cl::opt<unsigned>
|
|
TimeCompilations("time-compilations", cl::Hidden, cl::init(1u),
|
|
cl::value_desc("N"),
|
|
cl::desc("Repeat compilation N times for timing"));
|
|
|
|
static cl::opt<bool>
|
|
NoIntegratedAssembler("no-integrated-as", cl::Hidden,
|
|
cl::desc("Disable integrated assembler"));
|
|
|
|
static cl::opt<bool>
|
|
PreserveComments("preserve-as-comments", cl::Hidden,
|
|
cl::desc("Preserve Comments in outputted assembly"),
|
|
cl::init(true));
|
|
|
|
// Determine optimization level.
|
|
static cl::opt<char>
|
|
OptLevel("O",
|
|
cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] "
|
|
"(default = '-O2')"),
|
|
cl::Prefix,
|
|
cl::ZeroOrMore,
|
|
cl::init(' '));
|
|
|
|
static cl::opt<std::string>
|
|
TargetTriple("mtriple", cl::desc("Override target triple for module"));
|
|
|
|
static cl::opt<bool> NoVerify("disable-verify", cl::Hidden,
|
|
cl::desc("Do not verify input module"));
|
|
|
|
static cl::opt<bool> DisableSimplifyLibCalls("disable-simplify-libcalls",
|
|
cl::desc("Disable simplify-libcalls"));
|
|
|
|
static cl::opt<bool> ShowMCEncoding("show-mc-encoding", cl::Hidden,
|
|
cl::desc("Show encoding in .s output"));
|
|
|
|
static cl::opt<bool> EnableDwarfDirectory(
|
|
"enable-dwarf-directory", cl::Hidden,
|
|
cl::desc("Use .file directives with an explicit directory."));
|
|
|
|
static cl::opt<bool> AsmVerbose("asm-verbose",
|
|
cl::desc("Add comments to directives."),
|
|
cl::init(true));
|
|
|
|
static cl::opt<bool>
|
|
CompileTwice("compile-twice", cl::Hidden,
|
|
cl::desc("Run everything twice, re-using the same pass "
|
|
"manager and verify the result is the same."),
|
|
cl::init(false));
|
|
|
|
static cl::opt<bool> DiscardValueNames(
|
|
"discard-value-names",
|
|
cl::desc("Discard names from Value (other than GlobalValue)."),
|
|
cl::init(false), cl::Hidden);
|
|
|
|
namespace {
|
|
static ManagedStatic<std::vector<std::string>> RunPassNames;
|
|
|
|
struct RunPassOption {
|
|
void operator=(const std::string &Val) const {
|
|
if (Val.empty())
|
|
return;
|
|
SmallVector<StringRef, 8> PassNames;
|
|
StringRef(Val).split(PassNames, ',', -1, false);
|
|
for (auto PassName : PassNames)
|
|
RunPassNames->push_back(PassName);
|
|
}
|
|
};
|
|
}
|
|
|
|
static RunPassOption RunPassOpt;
|
|
|
|
static cl::opt<RunPassOption, true, cl::parser<std::string>> RunPass(
|
|
"run-pass",
|
|
cl::desc("Run compiler only for specified passes (comma separated list)"),
|
|
cl::value_desc("pass-name"), cl::ZeroOrMore, cl::location(RunPassOpt));
|
|
|
|
static int compileModule(char **, LLVMContext &);
|
|
|
|
static std::unique_ptr<tool_output_file>
|
|
GetOutputStream(const char *TargetName, Triple::OSType OS,
|
|
const char *ProgName) {
|
|
// If we don't yet have an output filename, make one.
|
|
if (OutputFilename.empty()) {
|
|
if (InputFilename == "-")
|
|
OutputFilename = "-";
|
|
else {
|
|
// If InputFilename ends in .bc or .ll, remove it.
|
|
StringRef IFN = InputFilename;
|
|
if (IFN.endswith(".bc") || IFN.endswith(".ll"))
|
|
OutputFilename = IFN.drop_back(3);
|
|
else if (IFN.endswith(".mir"))
|
|
OutputFilename = IFN.drop_back(4);
|
|
else
|
|
OutputFilename = IFN;
|
|
|
|
switch (FileType) {
|
|
case TargetMachine::CGFT_AssemblyFile:
|
|
if (TargetName[0] == 'c') {
|
|
if (TargetName[1] == 0)
|
|
OutputFilename += ".cbe.c";
|
|
else if (TargetName[1] == 'p' && TargetName[2] == 'p')
|
|
OutputFilename += ".cpp";
|
|
else
|
|
OutputFilename += ".s";
|
|
} else
|
|
OutputFilename += ".s";
|
|
break;
|
|
case TargetMachine::CGFT_ObjectFile:
|
|
if (OS == Triple::Win32)
|
|
OutputFilename += ".obj";
|
|
else
|
|
OutputFilename += ".o";
|
|
break;
|
|
case TargetMachine::CGFT_Null:
|
|
OutputFilename += ".null";
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Decide if we need "binary" output.
|
|
bool Binary = false;
|
|
switch (FileType) {
|
|
case TargetMachine::CGFT_AssemblyFile:
|
|
break;
|
|
case TargetMachine::CGFT_ObjectFile:
|
|
case TargetMachine::CGFT_Null:
|
|
Binary = true;
|
|
break;
|
|
}
|
|
|
|
// Open the file.
|
|
std::error_code EC;
|
|
sys::fs::OpenFlags OpenFlags = sys::fs::F_None;
|
|
if (!Binary)
|
|
OpenFlags |= sys::fs::F_Text;
|
|
auto FDOut = llvm::make_unique<tool_output_file>(OutputFilename, EC,
|
|
OpenFlags);
|
|
if (EC) {
|
|
errs() << EC.message() << '\n';
|
|
return nullptr;
|
|
}
|
|
|
|
return FDOut;
|
|
}
|
|
|
|
static void DiagnosticHandler(const DiagnosticInfo &DI, void *Context) {
|
|
bool *HasError = static_cast<bool *>(Context);
|
|
if (DI.getSeverity() == DS_Error)
|
|
*HasError = true;
|
|
|
|
DiagnosticPrinterRawOStream DP(errs());
|
|
errs() << LLVMContext::getDiagnosticMessagePrefix(DI.getSeverity()) << ": ";
|
|
DI.print(DP);
|
|
errs() << "\n";
|
|
}
|
|
|
|
// main - Entry point for the llc compiler.
|
|
//
|
|
int main(int argc, char **argv) {
|
|
sys::PrintStackTraceOnErrorSignal(argv[0]);
|
|
PrettyStackTraceProgram X(argc, argv);
|
|
|
|
// Enable debug stream buffering.
|
|
EnableDebugBuffering = true;
|
|
|
|
LLVMContext Context;
|
|
llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
|
|
|
|
// Initialize targets first, so that --version shows registered targets.
|
|
InitializeAllTargets();
|
|
InitializeAllTargetMCs();
|
|
InitializeAllAsmPrinters();
|
|
InitializeAllAsmParsers();
|
|
|
|
// Initialize codegen and IR passes used by llc so that the -print-after,
|
|
// -print-before, and -stop-after options work.
|
|
PassRegistry *Registry = PassRegistry::getPassRegistry();
|
|
initializeCore(*Registry);
|
|
initializeCodeGen(*Registry);
|
|
initializeLoopStrengthReducePass(*Registry);
|
|
initializeLowerIntrinsicsPass(*Registry);
|
|
initializeUnreachableBlockElimLegacyPassPass(*Registry);
|
|
|
|
// Register the target printer for --version.
|
|
cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion);
|
|
|
|
cl::ParseCommandLineOptions(argc, argv, "llvm system compiler\n");
|
|
|
|
Context.setDiscardValueNames(DiscardValueNames);
|
|
|
|
// Set a diagnostic handler that doesn't exit on the first error
|
|
bool HasError = false;
|
|
Context.setDiagnosticHandler(DiagnosticHandler, &HasError);
|
|
|
|
// Compile the module TimeCompilations times to give better compile time
|
|
// metrics.
|
|
for (unsigned I = TimeCompilations; I; --I)
|
|
if (int RetVal = compileModule(argv, Context))
|
|
return RetVal;
|
|
return 0;
|
|
}
|
|
|
|
static int compileModule(char **argv, LLVMContext &Context) {
|
|
// Load the module to be compiled...
|
|
SMDiagnostic Err;
|
|
std::unique_ptr<Module> M;
|
|
std::unique_ptr<MIRParser> MIR;
|
|
Triple TheTriple;
|
|
|
|
bool SkipModule = MCPU == "help" ||
|
|
(!MAttrs.empty() && MAttrs.front() == "help");
|
|
|
|
// If user just wants to list available options, skip module loading
|
|
if (!SkipModule) {
|
|
if (StringRef(InputFilename).endswith_lower(".mir")) {
|
|
MIR = createMIRParserFromFile(InputFilename, Err, Context);
|
|
if (MIR)
|
|
M = MIR->parseLLVMModule();
|
|
} else
|
|
M = parseIRFile(InputFilename, Err, Context);
|
|
if (!M) {
|
|
Err.print(argv[0], errs());
|
|
return 1;
|
|
}
|
|
|
|
// Verify module immediately to catch problems before doInitialization() is
|
|
// called on any passes.
|
|
if (!NoVerify && verifyModule(*M, &errs())) {
|
|
errs() << argv[0] << ": " << InputFilename
|
|
<< ": error: input module is broken!\n";
|
|
return 1;
|
|
}
|
|
|
|
// If we are supposed to override the target triple, do so now.
|
|
if (!TargetTriple.empty())
|
|
M->setTargetTriple(Triple::normalize(TargetTriple));
|
|
TheTriple = Triple(M->getTargetTriple());
|
|
} else {
|
|
TheTriple = Triple(Triple::normalize(TargetTriple));
|
|
}
|
|
|
|
if (TheTriple.getTriple().empty())
|
|
TheTriple.setTriple(sys::getDefaultTargetTriple());
|
|
|
|
// Get the target specific parser.
|
|
std::string Error;
|
|
const Target *TheTarget = TargetRegistry::lookupTarget(MArch, TheTriple,
|
|
Error);
|
|
if (!TheTarget) {
|
|
errs() << argv[0] << ": " << Error;
|
|
return 1;
|
|
}
|
|
|
|
std::string CPUStr = getCPUStr(), FeaturesStr = getFeaturesStr();
|
|
|
|
CodeGenOpt::Level OLvl = CodeGenOpt::Default;
|
|
switch (OptLevel) {
|
|
default:
|
|
errs() << argv[0] << ": invalid optimization level.\n";
|
|
return 1;
|
|
case ' ': break;
|
|
case '0': OLvl = CodeGenOpt::None; break;
|
|
case '1': OLvl = CodeGenOpt::Less; break;
|
|
case '2': OLvl = CodeGenOpt::Default; break;
|
|
case '3': OLvl = CodeGenOpt::Aggressive; break;
|
|
}
|
|
|
|
TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
|
|
Options.DisableIntegratedAS = NoIntegratedAssembler;
|
|
Options.MCOptions.ShowMCEncoding = ShowMCEncoding;
|
|
Options.MCOptions.MCUseDwarfDirectory = EnableDwarfDirectory;
|
|
Options.MCOptions.AsmVerbose = AsmVerbose;
|
|
Options.MCOptions.PreserveAsmComments = PreserveComments;
|
|
|
|
std::unique_ptr<TargetMachine> Target(
|
|
TheTarget->createTargetMachine(TheTriple.getTriple(), CPUStr, FeaturesStr,
|
|
Options, getRelocModel(), CMModel, OLvl));
|
|
|
|
assert(Target && "Could not allocate target machine!");
|
|
|
|
// If we don't have a module then just exit now. We do this down
|
|
// here since the CPU/Feature help is underneath the target machine
|
|
// creation.
|
|
if (SkipModule)
|
|
return 0;
|
|
|
|
assert(M && "Should have exited if we didn't have a module!");
|
|
if (FloatABIForCalls != FloatABI::Default)
|
|
Options.FloatABIType = FloatABIForCalls;
|
|
|
|
// Figure out where we are going to send the output.
|
|
std::unique_ptr<tool_output_file> Out =
|
|
GetOutputStream(TheTarget->getName(), TheTriple.getOS(), argv[0]);
|
|
if (!Out) return 1;
|
|
|
|
// Build up all of the passes that we want to do to the module.
|
|
legacy::PassManager PM;
|
|
|
|
// Add an appropriate TargetLibraryInfo pass for the module's triple.
|
|
TargetLibraryInfoImpl TLII(Triple(M->getTargetTriple()));
|
|
|
|
// The -disable-simplify-libcalls flag actually disables all builtin optzns.
|
|
if (DisableSimplifyLibCalls)
|
|
TLII.disableAllFunctions();
|
|
PM.add(new TargetLibraryInfoWrapperPass(TLII));
|
|
|
|
// Add the target data from the target machine, if it exists, or the module.
|
|
M->setDataLayout(Target->createDataLayout());
|
|
|
|
// Override function attributes based on CPUStr, FeaturesStr, and command line
|
|
// flags.
|
|
setFunctionAttributes(CPUStr, FeaturesStr, *M);
|
|
|
|
if (RelaxAll.getNumOccurrences() > 0 &&
|
|
FileType != TargetMachine::CGFT_ObjectFile)
|
|
errs() << argv[0]
|
|
<< ": warning: ignoring -mc-relax-all because filetype != obj";
|
|
|
|
{
|
|
raw_pwrite_stream *OS = &Out->os();
|
|
|
|
// Manually do the buffering rather than using buffer_ostream,
|
|
// so we can memcmp the contents in CompileTwice mode
|
|
SmallVector<char, 0> Buffer;
|
|
std::unique_ptr<raw_svector_ostream> BOS;
|
|
if ((FileType != TargetMachine::CGFT_AssemblyFile &&
|
|
!Out->os().supportsSeeking()) ||
|
|
CompileTwice) {
|
|
BOS = make_unique<raw_svector_ostream>(Buffer);
|
|
OS = BOS.get();
|
|
}
|
|
|
|
AnalysisID StartBeforeID = nullptr;
|
|
AnalysisID StartAfterID = nullptr;
|
|
AnalysisID StopAfterID = nullptr;
|
|
const PassRegistry *PR = PassRegistry::getPassRegistry();
|
|
if (!RunPassNames->empty()) {
|
|
if (!StartAfter.empty() || !StopAfter.empty()) {
|
|
errs() << argv[0] << ": start-after and/or stop-after passes are "
|
|
"redundant when run-pass is specified.\n";
|
|
return 1;
|
|
}
|
|
if (!MIR) {
|
|
errs() << argv[0] << ": run-pass needs a .mir input.\n";
|
|
return 1;
|
|
}
|
|
LLVMTargetMachine &LLVMTM = static_cast<LLVMTargetMachine&>(*Target);
|
|
TargetPassConfig *TPC = LLVMTM.createPassConfig(PM);
|
|
PM.add(TPC);
|
|
LLVMTM.addMachineModuleInfo(PM);
|
|
LLVMTM.addMachineFunctionAnalysis(PM, MIR.get());
|
|
TPC->printAndVerify("");
|
|
|
|
for (std::string &RunPassName : *RunPassNames) {
|
|
const PassInfo *PI = PR->getPassInfo(RunPassName);
|
|
if (!PI) {
|
|
errs() << argv[0] << ": run-pass " << RunPassName << " is not registered.\n";
|
|
return 1;
|
|
}
|
|
|
|
Pass *P;
|
|
if (PI->getTargetMachineCtor())
|
|
P = PI->getTargetMachineCtor()(Target.get());
|
|
else if (PI->getNormalCtor())
|
|
P = PI->getNormalCtor()();
|
|
else {
|
|
errs() << argv[0] << ": cannot create pass: "
|
|
<< PI->getPassName() << "\n";
|
|
return 1;
|
|
}
|
|
std::string Banner
|
|
= std::string("After ") + std::string(P->getPassName());
|
|
PM.add(P);
|
|
TPC->printAndVerify(Banner);
|
|
}
|
|
PM.add(createPrintMIRPass(*OS));
|
|
} else {
|
|
if (!StartAfter.empty()) {
|
|
const PassInfo *PI = PR->getPassInfo(StartAfter);
|
|
if (!PI) {
|
|
errs() << argv[0] << ": start-after pass is not registered.\n";
|
|
return 1;
|
|
}
|
|
StartAfterID = PI->getTypeInfo();
|
|
}
|
|
if (!StopAfter.empty()) {
|
|
const PassInfo *PI = PR->getPassInfo(StopAfter);
|
|
if (!PI) {
|
|
errs() << argv[0] << ": stop-after pass is not registered.\n";
|
|
return 1;
|
|
}
|
|
StopAfterID = PI->getTypeInfo();
|
|
}
|
|
|
|
// Ask the target to add backend passes as necessary.
|
|
if (Target->addPassesToEmitFile(PM, *OS, FileType, NoVerify,
|
|
StartBeforeID, StartAfterID, StopAfterID,
|
|
MIR.get())) {
|
|
errs() << argv[0] << ": target does not support generation of this"
|
|
<< " file type!\n";
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
// Before executing passes, print the final values of the LLVM options.
|
|
cl::PrintOptionValues();
|
|
|
|
// If requested, run the pass manager over the same module again,
|
|
// to catch any bugs due to persistent state in the passes. Note that
|
|
// opt has the same functionality, so it may be worth abstracting this out
|
|
// in the future.
|
|
SmallVector<char, 0> CompileTwiceBuffer;
|
|
if (CompileTwice) {
|
|
std::unique_ptr<Module> M2(llvm::CloneModule(M.get()));
|
|
PM.run(*M2);
|
|
CompileTwiceBuffer = Buffer;
|
|
Buffer.clear();
|
|
}
|
|
|
|
PM.run(*M);
|
|
|
|
auto HasError = *static_cast<bool *>(Context.getDiagnosticContext());
|
|
if (HasError)
|
|
return 1;
|
|
|
|
// Compare the two outputs and make sure they're the same
|
|
if (CompileTwice) {
|
|
if (Buffer.size() != CompileTwiceBuffer.size() ||
|
|
(memcmp(Buffer.data(), CompileTwiceBuffer.data(), Buffer.size()) !=
|
|
0)) {
|
|
errs()
|
|
<< "Running the pass manager twice changed the output.\n"
|
|
"Writing the result of the second run to the specified output\n"
|
|
"To generate the one-run comparison binary, just run without\n"
|
|
"the compile-twice option\n";
|
|
Out->os() << Buffer;
|
|
Out->keep();
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
if (BOS) {
|
|
Out->os() << Buffer;
|
|
}
|
|
}
|
|
|
|
// Declare success.
|
|
Out->keep();
|
|
|
|
return 0;
|
|
}
|