385 lines
12 KiB
C++
385 lines
12 KiB
C++
//===-- llc.cpp - Implement the LLVM Native Code Generator ----------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This is the llc code generator driver. It provides a convenient
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// command-line interface for generating native assembly-language code
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// or C code, given LLVM bitcode.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/Assembly/PrintModulePass.h"
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#include "llvm/CodeGen/CommandFlags.h"
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#include "llvm/CodeGen/LinkAllAsmWriterComponents.h"
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#include "llvm/CodeGen/LinkAllCodegenComponents.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IRReader/IRReader.h"
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#include "llvm/MC/SubtargetFeature.h"
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#include "llvm/Pass.h"
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#include "llvm/PassManager.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/FormattedStream.h"
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#include "llvm/Support/Host.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/PluginLoader.h"
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#include "llvm/Support/PrettyStackTrace.h"
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#include "llvm/Support/Signals.h"
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#include "llvm/Support/SourceMgr.h"
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#include "llvm/Support/TargetRegistry.h"
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#include "llvm/Support/TargetSelect.h"
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#include "llvm/Support/ToolOutputFile.h"
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#include "llvm/Target/TargetLibraryInfo.h"
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#include "llvm/Target/TargetMachine.h"
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#include <memory>
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using namespace llvm;
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// General options for llc. Other pass-specific options are specified
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// within the corresponding llc passes, and target-specific options
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// and back-end code generation options are specified with the target machine.
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//
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static cl::opt<std::string>
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InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-"));
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static cl::opt<std::string>
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OutputFilename("o", cl::desc("Output filename"), cl::value_desc("filename"));
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static cl::opt<unsigned>
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TimeCompilations("time-compilations", cl::Hidden, cl::init(1u),
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cl::value_desc("N"),
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cl::desc("Repeat compilation N times for timing"));
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// Determine optimization level.
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static cl::opt<char>
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OptLevel("O",
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cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] "
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"(default = '-O2')"),
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cl::Prefix,
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cl::ZeroOrMore,
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cl::init(' '));
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static cl::opt<std::string>
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TargetTriple("mtriple", cl::desc("Override target triple for module"));
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cl::opt<bool> NoVerify("disable-verify", cl::Hidden,
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cl::desc("Do not verify input module"));
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cl::opt<bool>
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DisableSimplifyLibCalls("disable-simplify-libcalls",
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cl::desc("Disable simplify-libcalls"),
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cl::init(false));
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static int compileModule(char**, LLVMContext&);
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// GetFileNameRoot - Helper function to get the basename of a filename.
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static inline std::string
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GetFileNameRoot(const std::string &InputFilename) {
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std::string IFN = InputFilename;
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std::string outputFilename;
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int Len = IFN.length();
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if ((Len > 2) &&
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IFN[Len-3] == '.' &&
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((IFN[Len-2] == 'b' && IFN[Len-1] == 'c') ||
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(IFN[Len-2] == 'l' && IFN[Len-1] == 'l'))) {
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outputFilename = std::string(IFN.begin(), IFN.end()-3); // s/.bc/.s/
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} else {
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outputFilename = IFN;
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}
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return outputFilename;
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}
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static tool_output_file *GetOutputStream(const char *TargetName,
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Triple::OSType OS,
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const char *ProgName) {
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// If we don't yet have an output filename, make one.
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if (OutputFilename.empty()) {
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if (InputFilename == "-")
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OutputFilename = "-";
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else {
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OutputFilename = GetFileNameRoot(InputFilename);
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switch (FileType) {
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case TargetMachine::CGFT_AssemblyFile:
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if (TargetName[0] == 'c') {
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if (TargetName[1] == 0)
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OutputFilename += ".cbe.c";
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else if (TargetName[1] == 'p' && TargetName[2] == 'p')
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OutputFilename += ".cpp";
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else
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OutputFilename += ".s";
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} else
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OutputFilename += ".s";
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break;
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case TargetMachine::CGFT_ObjectFile:
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if (OS == Triple::Win32)
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OutputFilename += ".obj";
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else
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OutputFilename += ".o";
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break;
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case TargetMachine::CGFT_Null:
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OutputFilename += ".null";
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break;
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}
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}
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}
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// Decide if we need "binary" output.
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bool Binary = false;
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switch (FileType) {
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case TargetMachine::CGFT_AssemblyFile:
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break;
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case TargetMachine::CGFT_ObjectFile:
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case TargetMachine::CGFT_Null:
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Binary = true;
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break;
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}
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// Open the file.
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std::string error;
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unsigned OpenFlags = 0;
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if (Binary) OpenFlags |= raw_fd_ostream::F_Binary;
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tool_output_file *FDOut = new tool_output_file(OutputFilename.c_str(), error,
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OpenFlags);
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if (!error.empty()) {
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errs() << error << '\n';
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delete FDOut;
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return 0;
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}
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return FDOut;
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}
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// main - Entry point for the llc compiler.
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//
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int main(int argc, char **argv) {
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sys::PrintStackTraceOnErrorSignal();
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PrettyStackTraceProgram X(argc, argv);
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// Enable debug stream buffering.
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EnableDebugBuffering = true;
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LLVMContext &Context = getGlobalContext();
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llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
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// Initialize targets first, so that --version shows registered targets.
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InitializeAllTargets();
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InitializeAllTargetMCs();
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InitializeAllAsmPrinters();
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InitializeAllAsmParsers();
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// Initialize codegen and IR passes used by llc so that the -print-after,
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// -print-before, and -stop-after options work.
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PassRegistry *Registry = PassRegistry::getPassRegistry();
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initializeCore(*Registry);
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initializeCodeGen(*Registry);
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initializeLoopStrengthReducePass(*Registry);
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initializeLowerIntrinsicsPass(*Registry);
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initializeUnreachableBlockElimPass(*Registry);
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// Register the target printer for --version.
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cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion);
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cl::ParseCommandLineOptions(argc, argv, "llvm system compiler\n");
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// Compile the module TimeCompilations times to give better compile time
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// metrics.
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for (unsigned I = TimeCompilations; I; --I)
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if (int RetVal = compileModule(argv, Context))
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return RetVal;
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return 0;
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}
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static int compileModule(char **argv, LLVMContext &Context) {
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// Load the module to be compiled...
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SMDiagnostic Err;
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OwningPtr<Module> M;
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Module *mod = 0;
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Triple TheTriple;
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bool SkipModule = MCPU == "help" ||
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(!MAttrs.empty() && MAttrs.front() == "help");
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// If user just wants to list available options, skip module loading
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if (!SkipModule) {
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M.reset(ParseIRFile(InputFilename, Err, Context));
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mod = M.get();
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if (mod == 0) {
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Err.print(argv[0], errs());
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return 1;
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}
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// If we are supposed to override the target triple, do so now.
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if (!TargetTriple.empty())
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mod->setTargetTriple(Triple::normalize(TargetTriple));
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TheTriple = Triple(mod->getTargetTriple());
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} else {
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TheTriple = Triple(Triple::normalize(TargetTriple));
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}
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if (TheTriple.getTriple().empty())
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TheTriple.setTriple(sys::getDefaultTargetTriple());
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// Get the target specific parser.
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std::string Error;
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const Target *TheTarget = TargetRegistry::lookupTarget(MArch, TheTriple,
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Error);
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if (!TheTarget) {
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errs() << argv[0] << ": " << Error;
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return 1;
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}
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// Package up features to be passed to target/subtarget
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std::string FeaturesStr;
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if (MAttrs.size()) {
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SubtargetFeatures Features;
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for (unsigned i = 0; i != MAttrs.size(); ++i)
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Features.AddFeature(MAttrs[i]);
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FeaturesStr = Features.getString();
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}
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CodeGenOpt::Level OLvl = CodeGenOpt::Default;
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switch (OptLevel) {
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default:
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errs() << argv[0] << ": invalid optimization level.\n";
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return 1;
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case ' ': break;
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case '0': OLvl = CodeGenOpt::None; break;
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case '1': OLvl = CodeGenOpt::Less; break;
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case '2': OLvl = CodeGenOpt::Default; break;
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case '3': OLvl = CodeGenOpt::Aggressive; break;
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}
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TargetOptions Options;
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Options.LessPreciseFPMADOption = EnableFPMAD;
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Options.NoFramePointerElim = DisableFPElim;
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Options.NoFramePointerElimNonLeaf = DisableFPElimNonLeaf;
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Options.AllowFPOpFusion = FuseFPOps;
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Options.UnsafeFPMath = EnableUnsafeFPMath;
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Options.NoInfsFPMath = EnableNoInfsFPMath;
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Options.NoNaNsFPMath = EnableNoNaNsFPMath;
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Options.HonorSignDependentRoundingFPMathOption =
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EnableHonorSignDependentRoundingFPMath;
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Options.UseSoftFloat = GenerateSoftFloatCalls;
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if (FloatABIForCalls != FloatABI::Default)
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Options.FloatABIType = FloatABIForCalls;
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Options.NoZerosInBSS = DontPlaceZerosInBSS;
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Options.GuaranteedTailCallOpt = EnableGuaranteedTailCallOpt;
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Options.DisableTailCalls = DisableTailCalls;
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Options.StackAlignmentOverride = OverrideStackAlignment;
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Options.RealignStack = EnableRealignStack;
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Options.TrapFuncName = TrapFuncName;
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Options.PositionIndependentExecutable = EnablePIE;
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Options.EnableSegmentedStacks = SegmentedStacks;
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Options.UseInitArray = UseInitArray;
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Options.SSPBufferSize = SSPBufferSize;
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OwningPtr<TargetMachine>
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target(TheTarget->createTargetMachine(TheTriple.getTriple(),
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MCPU, FeaturesStr, Options,
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RelocModel, CMModel, OLvl));
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assert(target.get() && "Could not allocate target machine!");
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assert(mod && "Should have exited after outputting help!");
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TargetMachine &Target = *target.get();
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if (DisableDotLoc)
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Target.setMCUseLoc(false);
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if (DisableCFI)
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Target.setMCUseCFI(false);
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if (EnableDwarfDirectory)
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Target.setMCUseDwarfDirectory(true);
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if (GenerateSoftFloatCalls)
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FloatABIForCalls = FloatABI::Soft;
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// Disable .loc support for older OS X versions.
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if (TheTriple.isMacOSX() &&
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TheTriple.isMacOSXVersionLT(10, 6))
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Target.setMCUseLoc(false);
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// Figure out where we are going to send the output.
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OwningPtr<tool_output_file> Out
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(GetOutputStream(TheTarget->getName(), TheTriple.getOS(), argv[0]));
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if (!Out) return 1;
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// Build up all of the passes that we want to do to the module.
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PassManager PM;
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// Add an appropriate TargetLibraryInfo pass for the module's triple.
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TargetLibraryInfo *TLI = new TargetLibraryInfo(TheTriple);
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if (DisableSimplifyLibCalls)
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TLI->disableAllFunctions();
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PM.add(TLI);
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// Add intenal analysis passes from the target machine.
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Target.addAnalysisPasses(PM);
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// Add the target data from the target machine, if it exists, or the module.
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if (const DataLayout *TD = Target.getDataLayout())
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PM.add(new DataLayout(*TD));
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else
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PM.add(new DataLayout(mod));
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// Override default to generate verbose assembly.
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Target.setAsmVerbosityDefault(true);
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if (RelaxAll) {
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if (FileType != TargetMachine::CGFT_ObjectFile)
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errs() << argv[0]
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<< ": warning: ignoring -mc-relax-all because filetype != obj";
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else
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Target.setMCRelaxAll(true);
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}
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{
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formatted_raw_ostream FOS(Out->os());
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AnalysisID StartAfterID = 0;
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AnalysisID StopAfterID = 0;
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const PassRegistry *PR = PassRegistry::getPassRegistry();
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if (!StartAfter.empty()) {
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const PassInfo *PI = PR->getPassInfo(StartAfter);
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if (!PI) {
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errs() << argv[0] << ": start-after pass is not registered.\n";
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return 1;
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}
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StartAfterID = PI->getTypeInfo();
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}
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if (!StopAfter.empty()) {
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const PassInfo *PI = PR->getPassInfo(StopAfter);
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if (!PI) {
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errs() << argv[0] << ": stop-after pass is not registered.\n";
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return 1;
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}
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StopAfterID = PI->getTypeInfo();
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}
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// Ask the target to add backend passes as necessary.
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if (Target.addPassesToEmitFile(PM, FOS, FileType, NoVerify,
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StartAfterID, StopAfterID)) {
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errs() << argv[0] << ": target does not support generation of this"
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<< " file type!\n";
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return 1;
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}
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// Before executing passes, print the final values of the LLVM options.
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cl::PrintOptionValues();
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PM.run(*mod);
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}
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// Declare success.
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Out->keep();
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return 0;
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}
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