forked from OSchip/llvm-project
644 lines
21 KiB
C++
644 lines
21 KiB
C++
//===-- llc.cpp - Implement the LLVM Native Code Generator ----------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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.inc"
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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/CodeGen/TargetSubtargetInfo.h"
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#include "llvm/IR/AutoUpgrade.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/RemarkStreamer.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/InitLLVM.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/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/Support/WithColor.h"
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#include "llvm/Target/TargetMachine.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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InputLanguage("x", cl::desc("Input language ('ir' or 'mir')"));
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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<std::string>
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SplitDwarfOutputFile("split-dwarf-output",
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cl::desc(".dwo output filename"),
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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<std::string> SplitDwarfFile(
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"split-dwarf-file",
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cl::desc(
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"Specify the name of the .dwo file to encode in the DWARF output"));
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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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static cl::list<std::string> IncludeDirs("I", cl::desc("include search path"));
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static cl::opt<bool> PassRemarksWithHotness(
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"pass-remarks-with-hotness",
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cl::desc("With PGO, include profile count in optimization remarks"),
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cl::Hidden);
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static cl::opt<unsigned> PassRemarksHotnessThreshold(
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"pass-remarks-hotness-threshold",
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cl::desc("Minimum profile count required for an optimization remark to be output"),
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cl::Hidden);
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static cl::opt<std::string>
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RemarksFilename("pass-remarks-output",
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cl::desc("YAML output filename for pass remarks"),
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cl::value_desc("filename"));
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static cl::opt<std::string>
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RemarksPasses("pass-remarks-filter",
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cl::desc("Only record optimization remarks from passes whose "
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"names match the given regular expression"),
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cl::value_desc("regex"));
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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<ToolOutputFile> 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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// 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<ToolOutputFile>(OutputFilename, EC, OpenFlags);
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if (EC) {
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WithColor::error() << 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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struct LLCDiagnosticHandler : public DiagnosticHandler {
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bool *HasError;
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LLCDiagnosticHandler(bool *HasErrorPtr) : HasError(HasErrorPtr) {}
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bool handleDiagnostics(const DiagnosticInfo &DI) override {
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if (DI.getSeverity() == DS_Error)
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*HasError = true;
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if (auto *Remark = dyn_cast<DiagnosticInfoOptimizationBase>(&DI))
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if (!Remark->isEnabled())
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return 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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return true;
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}
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};
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static void InlineAsmDiagHandler(const SMDiagnostic &SMD, void *Context,
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unsigned LocCookie) {
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bool *HasError = static_cast<bool *>(Context);
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if (SMD.getKind() == SourceMgr::DK_Error)
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*HasError = true;
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SMD.print(nullptr, errs());
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// For testing purposes, we print the LocCookie here.
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if (LocCookie)
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WithColor::note() << "!srcloc = " << LocCookie << "\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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InitLLVM 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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// 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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initializeEntryExitInstrumenterPass(*Registry);
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initializePostInlineEntryExitInstrumenterPass(*Registry);
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initializeUnreachableBlockElimLegacyPassPass(*Registry);
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initializeConstantHoistingLegacyPassPass(*Registry);
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initializeScalarOpts(*Registry);
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initializeVectorization(*Registry);
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initializeScalarizeMaskedMemIntrinPass(*Registry);
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initializeExpandReductionsPass(*Registry);
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// Initialize debugging passes.
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initializeScavengerTestPass(*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(
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llvm::make_unique<LLCDiagnosticHandler>(&HasError));
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Context.setInlineAsmDiagnosticHandler(InlineAsmDiagHandler, &HasError);
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if (PassRemarksWithHotness)
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Context.setDiagnosticsHotnessRequested(true);
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if (PassRemarksHotnessThreshold)
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Context.setDiagnosticsHotnessThreshold(PassRemarksHotnessThreshold);
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std::unique_ptr<ToolOutputFile> YamlFile;
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if (RemarksFilename != "") {
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std::error_code EC;
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YamlFile =
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llvm::make_unique<ToolOutputFile>(RemarksFilename, EC, sys::fs::F_None);
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if (EC) {
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WithColor::error(errs(), argv[0]) << EC.message() << '\n';
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return 1;
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}
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Context.setRemarkStreamer(
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llvm::make_unique<RemarkStreamer>(RemarksFilename, YamlFile->os()));
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if (!RemarksPasses.empty())
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if (Error E = Context.getRemarkStreamer()->setFilter(RemarksPasses)) {
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WithColor::error(errs(), argv[0]) << E << '\n';
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return 1;
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}
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}
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if (InputLanguage != "" && InputLanguage != "ir" &&
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InputLanguage != "mir") {
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WithColor::error(errs(), argv[0])
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<< "input language must be '', 'IR' or 'MIR'\n";
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return 1;
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}
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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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if (YamlFile)
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YamlFile->keep();
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return 0;
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}
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static bool addPass(PassManagerBase &PM, const char *argv0,
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StringRef PassName, TargetPassConfig &TPC) {
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if (PassName == "none")
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return false;
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const PassRegistry *PR = PassRegistry::getPassRegistry();
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const PassInfo *PI = PR->getPassInfo(PassName);
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if (!PI) {
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WithColor::error(errs(), argv0)
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<< "run-pass " << PassName << " is not registered.\n";
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return true;
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}
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Pass *P;
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if (PI->getNormalCtor())
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P = PI->getNormalCtor()();
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else {
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WithColor::error(errs(), argv0)
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<< "cannot create pass: " << PI->getPassName() << "\n";
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return true;
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}
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std::string Banner = 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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return false;
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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 (InputLanguage == "mir" ||
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(InputLanguage == "" && StringRef(InputFilename).endswith(".mir"))) {
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MIR = createMIRParserFromFile(InputFilename, Err, Context);
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if (MIR)
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M = MIR->parseIRModule();
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} else
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M = parseIRFile(InputFilename, Err, Context, false);
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if (!M) {
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Err.print(argv[0], WithColor::error(errs(), argv[0]));
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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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WithColor::error(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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WithColor::error(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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Options.MCOptions.IASSearchPaths = IncludeDirs;
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Options.MCOptions.SplitDwarfFile = SplitDwarfFile;
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std::unique_ptr<TargetMachine> Target(TheTarget->createTargetMachine(
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TheTriple.getTriple(), CPUStr, FeaturesStr, Options, getRelocModel(),
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getCodeModel(), 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<ToolOutputFile> Out =
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GetOutputStream(TheTarget->getName(), TheTriple.getOS(), argv[0]);
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if (!Out) return 1;
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std::unique_ptr<ToolOutputFile> DwoOut;
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if (!SplitDwarfOutputFile.empty()) {
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std::error_code EC;
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DwoOut = llvm::make_unique<ToolOutputFile>(SplitDwarfOutputFile, EC,
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sys::fs::F_None);
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if (EC) {
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WithColor::error(errs(), argv[0]) << EC.message() << '\n';
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return 1;
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}
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}
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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;
|
|
|
|
// 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());
|
|
|
|
// This needs to be done after setting datalayout since it calls verifier
|
|
// to check debug info whereas verifier relies on correct datalayout.
|
|
UpgradeDebugInfo(*M);
|
|
|
|
// Verify module immediately to catch problems before doInitialization() is
|
|
// called on any passes.
|
|
if (!NoVerify && verifyModule(*M, &errs())) {
|
|
std::string Prefix =
|
|
(Twine(argv[0]) + Twine(": ") + Twine(InputFilename)).str();
|
|
WithColor::error(errs(), Prefix) << "input module is broken!\n";
|
|
return 1;
|
|
}
|
|
|
|
// Override function attributes based on CPUStr, FeaturesStr, and command line
|
|
// flags.
|
|
setFunctionAttributes(CPUStr, FeaturesStr, *M);
|
|
|
|
if (RelaxAll.getNumOccurrences() > 0 &&
|
|
FileType != TargetMachine::CGFT_ObjectFile)
|
|
WithColor::warning(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();
|
|
}
|
|
|
|
const char *argv0 = argv[0];
|
|
LLVMTargetMachine &LLVMTM = static_cast<LLVMTargetMachine&>(*Target);
|
|
MachineModuleInfo *MMI = new MachineModuleInfo(&LLVMTM);
|
|
|
|
// Construct a custom pass pipeline that starts after instruction
|
|
// selection.
|
|
if (!RunPassNames->empty()) {
|
|
if (!MIR) {
|
|
WithColor::warning(errs(), argv[0])
|
|
<< "run-pass is for .mir file only.\n";
|
|
return 1;
|
|
}
|
|
TargetPassConfig &TPC = *LLVMTM.createPassConfig(PM);
|
|
if (TPC.hasLimitedCodeGenPipeline()) {
|
|
WithColor::warning(errs(), argv[0])
|
|
<< "run-pass cannot be used with "
|
|
<< TPC.getLimitedCodeGenPipelineReason(" and ") << ".\n";
|
|
return 1;
|
|
}
|
|
|
|
TPC.setDisableVerify(NoVerify);
|
|
PM.add(&TPC);
|
|
PM.add(MMI);
|
|
TPC.printAndVerify("");
|
|
for (const std::string &RunPassName : *RunPassNames) {
|
|
if (addPass(PM, argv0, RunPassName, TPC))
|
|
return 1;
|
|
}
|
|
TPC.setInitialized();
|
|
PM.add(createPrintMIRPass(*OS));
|
|
PM.add(createFreeMachineFunctionPass());
|
|
} else if (Target->addPassesToEmitFile(PM, *OS,
|
|
DwoOut ? &DwoOut->os() : nullptr,
|
|
FileType, NoVerify, MMI)) {
|
|
WithColor::warning(errs(), argv[0])
|
|
<< "target does not support generation of this"
|
|
<< " file type!\n";
|
|
return 1;
|
|
}
|
|
|
|
if (MIR) {
|
|
assert(MMI && "Forgot to create MMI?");
|
|
if (MIR->parseMachineFunctions(*M, *MMI))
|
|
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));
|
|
PM.run(*M2);
|
|
CompileTwiceBuffer = Buffer;
|
|
Buffer.clear();
|
|
}
|
|
|
|
PM.run(*M);
|
|
|
|
auto HasError =
|
|
((const LLCDiagnosticHandler *)(Context.getDiagHandlerPtr()))->HasError;
|
|
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();
|
|
if (DwoOut)
|
|
DwoOut->keep();
|
|
|
|
return 0;
|
|
}
|