519 lines
17 KiB
C++
519 lines
17 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/ADT/STLExtras.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/Analysis/TargetLibraryInfo.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/CodeGen/MIRParser/MIRParser.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/MachineModuleInfo.h"
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#include "llvm/CodeGen/TargetPassConfig.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/DiagnosticInfo.h"
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#include "llvm/IR/DiagnosticPrinter.h"
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#include "llvm/IR/IRPrintingPasses.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/LegacyPassManager.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/Verifier.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/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/FileSystem.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/TargetMachine.h"
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#include "llvm/Target/TargetSubtargetInfo.h"
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#include "llvm/Transforms/Utils/Cloning.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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static cl::opt<bool>
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NoIntegratedAssembler("no-integrated-as", cl::Hidden,
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cl::desc("Disable integrated assembler"));
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static cl::opt<bool>
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PreserveComments("preserve-as-comments", cl::Hidden,
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cl::desc("Preserve Comments in outputted assembly"),
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cl::init(true));
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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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static cl::opt<bool> NoVerify("disable-verify", cl::Hidden,
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cl::desc("Do not verify input module"));
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static cl::opt<bool> DisableSimplifyLibCalls("disable-simplify-libcalls",
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cl::desc("Disable simplify-libcalls"));
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static cl::opt<bool> ShowMCEncoding("show-mc-encoding", cl::Hidden,
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cl::desc("Show encoding in .s output"));
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static cl::opt<bool> EnableDwarfDirectory(
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"enable-dwarf-directory", cl::Hidden,
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cl::desc("Use .file directives with an explicit directory."));
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static cl::opt<bool> AsmVerbose("asm-verbose",
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cl::desc("Add comments to directives."),
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cl::init(true));
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static cl::opt<bool>
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CompileTwice("compile-twice", cl::Hidden,
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cl::desc("Run everything twice, re-using the same pass "
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"manager and verify the result is the same."),
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cl::init(false));
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static cl::opt<bool> DiscardValueNames(
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"discard-value-names",
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cl::desc("Discard names from Value (other than GlobalValue)."),
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cl::init(false), cl::Hidden);
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namespace {
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static ManagedStatic<std::vector<std::string>> RunPassNames;
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struct RunPassOption {
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void operator=(const std::string &Val) const {
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if (Val.empty())
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return;
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SmallVector<StringRef, 8> PassNames;
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StringRef(Val).split(PassNames, ',', -1, false);
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for (auto PassName : PassNames)
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RunPassNames->push_back(PassName);
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}
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};
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}
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static RunPassOption RunPassOpt;
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static cl::opt<RunPassOption, true, cl::parser<std::string>> RunPass(
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"run-pass",
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cl::desc("Run compiler only for specified passes (comma separated list)"),
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cl::value_desc("pass-name"), cl::ZeroOrMore, cl::location(RunPassOpt));
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static int compileModule(char **, LLVMContext &);
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static std::unique_ptr<tool_output_file>
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GetOutputStream(const char *TargetName, 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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// If InputFilename ends in .bc or .ll, remove it.
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StringRef IFN = InputFilename;
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if (IFN.endswith(".bc") || IFN.endswith(".ll"))
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OutputFilename = IFN.drop_back(3);
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else if (IFN.endswith(".mir"))
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OutputFilename = IFN.drop_back(4);
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else
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OutputFilename = IFN;
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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::error_code EC;
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sys::fs::OpenFlags OpenFlags = sys::fs::F_None;
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if (!Binary)
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OpenFlags |= sys::fs::F_Text;
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auto FDOut = llvm::make_unique<tool_output_file>(OutputFilename, EC,
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OpenFlags);
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if (EC) {
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errs() << EC.message() << '\n';
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return nullptr;
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}
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return FDOut;
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}
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static void DiagnosticHandler(const DiagnosticInfo &DI, void *Context) {
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bool *HasError = static_cast<bool *>(Context);
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if (DI.getSeverity() == DS_Error)
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*HasError = true;
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DiagnosticPrinterRawOStream DP(errs());
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errs() << LLVMContext::getDiagnosticMessagePrefix(DI.getSeverity()) << ": ";
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DI.print(DP);
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errs() << "\n";
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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(argv[0]);
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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;
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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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initializeUnreachableBlockElimLegacyPassPass(*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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Context.setDiscardValueNames(DiscardValueNames);
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// Set a diagnostic handler that doesn't exit on the first error
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bool HasError = false;
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Context.setDiagnosticHandler(DiagnosticHandler, &HasError);
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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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std::unique_ptr<Module> M;
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std::unique_ptr<MIRParser> MIR;
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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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if (StringRef(InputFilename).endswith_lower(".mir")) {
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MIR = createMIRParserFromFile(InputFilename, Err, Context);
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if (MIR)
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M = MIR->parseLLVMModule();
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} else
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M = parseIRFile(InputFilename, Err, Context);
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if (!M) {
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Err.print(argv[0], errs());
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return 1;
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}
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// Verify module immediately to catch problems before doInitialization() is
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// called on any passes.
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if (!NoVerify && verifyModule(*M, &errs())) {
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errs() << argv[0] << ": " << InputFilename
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<< ": error: input module is broken!\n";
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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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M->setTargetTriple(Triple::normalize(TargetTriple));
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TheTriple = Triple(M->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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std::string CPUStr = getCPUStr(), FeaturesStr = getFeaturesStr();
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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 = InitTargetOptionsFromCodeGenFlags();
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Options.DisableIntegratedAS = NoIntegratedAssembler;
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Options.MCOptions.ShowMCEncoding = ShowMCEncoding;
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Options.MCOptions.MCUseDwarfDirectory = EnableDwarfDirectory;
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Options.MCOptions.AsmVerbose = AsmVerbose;
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Options.MCOptions.PreserveAsmComments = PreserveComments;
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std::unique_ptr<TargetMachine> Target(
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TheTarget->createTargetMachine(TheTriple.getTriple(), CPUStr, FeaturesStr,
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Options, getRelocModel(), CMModel, OLvl));
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assert(Target && "Could not allocate target machine!");
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// If we don't have a module then just exit now. We do this down
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// here since the CPU/Feature help is underneath the target machine
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// creation.
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if (SkipModule)
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return 0;
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assert(M && "Should have exited if we didn't have a module!");
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if (FloatABIForCalls != FloatABI::Default)
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Options.FloatABIType = FloatABIForCalls;
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// Figure out where we are going to send the output.
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std::unique_ptr<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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legacy::PassManager PM;
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// Add an appropriate TargetLibraryInfo pass for the module's triple.
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TargetLibraryInfoImpl TLII(Triple(M->getTargetTriple()));
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// The -disable-simplify-libcalls flag actually disables all builtin optzns.
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if (DisableSimplifyLibCalls)
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TLII.disableAllFunctions();
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PM.add(new TargetLibraryInfoWrapperPass(TLII));
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// Add the target data from the target machine, if it exists, or the module.
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M->setDataLayout(Target->createDataLayout());
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// Override function attributes based on CPUStr, FeaturesStr, and command line
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// flags.
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setFunctionAttributes(CPUStr, FeaturesStr, *M);
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if (RelaxAll.getNumOccurrences() > 0 &&
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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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{
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raw_pwrite_stream *OS = &Out->os();
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// Manually do the buffering rather than using buffer_ostream,
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// so we can memcmp the contents in CompileTwice mode
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SmallVector<char, 0> Buffer;
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std::unique_ptr<raw_svector_ostream> BOS;
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if ((FileType != TargetMachine::CGFT_AssemblyFile &&
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!Out->os().supportsSeeking()) ||
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CompileTwice) {
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BOS = make_unique<raw_svector_ostream>(Buffer);
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OS = BOS.get();
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}
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AnalysisID StartBeforeID = nullptr;
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AnalysisID StartAfterID = nullptr;
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AnalysisID StopAfterID = nullptr;
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const PassRegistry *PR = PassRegistry::getPassRegistry();
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if (!RunPassNames->empty()) {
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if (!StartAfter.empty() || !StopAfter.empty()) {
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errs() << argv[0] << ": start-after and/or stop-after passes are "
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"redundant when run-pass is specified.\n";
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return 1;
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}
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if (!MIR) {
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errs() << argv[0] << ": run-pass needs a .mir input.\n";
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return 1;
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}
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LLVMTargetMachine &LLVMTM = static_cast<LLVMTargetMachine&>(*Target);
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TargetPassConfig *TPC = LLVMTM.createPassConfig(PM);
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PM.add(TPC);
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LLVMTM.addMachineModuleInfo(PM);
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LLVMTM.addMachineFunctionAnalysis(PM, MIR.get());
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TPC->printAndVerify("");
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for (std::string &RunPassName : *RunPassNames) {
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const PassInfo *PI = PR->getPassInfo(RunPassName);
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if (!PI) {
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errs() << argv[0] << ": run-pass " << RunPassName << " is not registered.\n";
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return 1;
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}
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Pass *P;
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if (PI->getTargetMachineCtor())
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P = PI->getTargetMachineCtor()(Target.get());
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else if (PI->getNormalCtor())
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P = PI->getNormalCtor()();
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else {
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errs() << argv[0] << ": cannot create pass: "
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<< PI->getPassName() << "\n";
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return 1;
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}
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std::string Banner
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= std::string("After ") + std::string(P->getPassName());
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PM.add(P);
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TPC->printAndVerify(Banner);
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}
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PM.add(createPrintMIRPass(*OS));
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} else {
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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, *OS, FileType, NoVerify,
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StartBeforeID, StartAfterID, StopAfterID,
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MIR.get())) {
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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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}
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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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// If requested, run the pass manager over the same module again,
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// to catch any bugs due to persistent state in the passes. Note that
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// opt has the same functionality, so it may be worth abstracting this out
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// in the future.
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SmallVector<char, 0> CompileTwiceBuffer;
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if (CompileTwice) {
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std::unique_ptr<Module> M2(llvm::CloneModule(M.get()));
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PM.run(*M2);
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CompileTwiceBuffer = Buffer;
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Buffer.clear();
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}
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PM.run(*M);
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auto HasError = *static_cast<bool *>(Context.getDiagnosticContext());
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if (HasError)
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return 1;
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// Compare the two outputs and make sure they're the same
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if (CompileTwice) {
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if (Buffer.size() != CompileTwiceBuffer.size() ||
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(memcmp(Buffer.data(), CompileTwiceBuffer.data(), Buffer.size()) !=
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0)) {
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errs()
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<< "Running the pass manager twice changed the output.\n"
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|
"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;
|
|
}
|