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https://github.com/ClickHouse/ClickHouse.git
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541 lines
18 KiB
C++
541 lines
18 KiB
C++
//===-- cc1as_main.cpp - Clang Assembler ---------------------------------===//
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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 entry point to the clang -cc1as functionality, which implements
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// the direct interface to the LLVM MC based assembler.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Basic/Diagnostic.h"
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#include "clang/Basic/DiagnosticOptions.h"
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#include "clang/Driver/DriverDiagnostic.h"
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#include "clang/Driver/Options.h"
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#include "clang/Frontend/FrontendDiagnostic.h"
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#include "clang/Frontend/TextDiagnosticPrinter.h"
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#include "clang/Frontend/Utils.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/StringSwitch.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/MC/MCAsmBackend.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCCodeEmitter.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCInstrInfo.h"
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#include "llvm/MC/MCObjectFileInfo.h"
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#include "llvm/MC/MCParser/MCAsmParser.h"
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#include "llvm/MC/MCParser/MCTargetAsmParser.h"
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#include "llvm/MC/MCRegisterInfo.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSubtargetInfo.h"
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#include "llvm/MC/MCTargetOptions.h"
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#include "llvm/Option/Arg.h"
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#include "llvm/Option/ArgList.h"
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#include "llvm/Option/OptTable.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/ErrorHandling.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/MemoryBuffer.h"
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#include "llvm/Support/Path.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/Timer.h"
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#include "llvm/Support/raw_ostream.h"
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#include <memory>
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#include <system_error>
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using namespace clang;
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using namespace clang::driver;
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using namespace clang::driver::options;
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using namespace llvm;
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using namespace llvm::opt;
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namespace {
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/// \brief Helper class for representing a single invocation of the assembler.
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struct AssemblerInvocation {
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/// @name Target Options
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/// @{
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/// The name of the target triple to assemble for.
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std::string Triple;
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/// If given, the name of the target CPU to determine which instructions
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/// are legal.
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std::string CPU;
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/// The list of target specific features to enable or disable -- this should
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/// be a list of strings starting with '+' or '-'.
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std::vector<std::string> Features;
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/// The list of symbol definitions.
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std::vector<std::string> SymbolDefs;
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/// @}
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/// @name Language Options
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/// @{
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std::vector<std::string> IncludePaths;
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unsigned NoInitialTextSection : 1;
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unsigned SaveTemporaryLabels : 1;
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unsigned GenDwarfForAssembly : 1;
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unsigned RelaxELFRelocations : 1;
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unsigned DwarfVersion;
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std::string DwarfDebugFlags;
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std::string DwarfDebugProducer;
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std::string DebugCompilationDir;
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llvm::DebugCompressionType CompressDebugSections =
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llvm::DebugCompressionType::None;
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std::string MainFileName;
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/// @}
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/// @name Frontend Options
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/// @{
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std::string InputFile;
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std::vector<std::string> LLVMArgs;
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std::string OutputPath;
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enum FileType {
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FT_Asm, ///< Assembly (.s) output, transliterate mode.
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FT_Null, ///< No output, for timing purposes.
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FT_Obj ///< Object file output.
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};
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FileType OutputType;
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unsigned ShowHelp : 1;
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unsigned ShowVersion : 1;
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/// @}
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/// @name Transliterate Options
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/// @{
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unsigned OutputAsmVariant;
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unsigned ShowEncoding : 1;
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unsigned ShowInst : 1;
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/// @}
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/// @name Assembler Options
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/// @{
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unsigned RelaxAll : 1;
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unsigned NoExecStack : 1;
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unsigned FatalWarnings : 1;
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unsigned IncrementalLinkerCompatible : 1;
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/// The name of the relocation model to use.
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std::string RelocationModel;
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/// @}
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public:
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AssemblerInvocation() {
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Triple = "";
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NoInitialTextSection = 0;
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InputFile = "-";
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OutputPath = "-";
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OutputType = FT_Asm;
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OutputAsmVariant = 0;
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ShowInst = 0;
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ShowEncoding = 0;
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RelaxAll = 0;
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NoExecStack = 0;
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FatalWarnings = 0;
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IncrementalLinkerCompatible = 0;
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DwarfVersion = 0;
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}
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static bool CreateFromArgs(AssemblerInvocation &Res,
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ArrayRef<const char *> Argv,
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DiagnosticsEngine &Diags);
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};
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}
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bool AssemblerInvocation::CreateFromArgs(AssemblerInvocation &Opts,
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ArrayRef<const char *> Argv,
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DiagnosticsEngine &Diags) {
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bool Success = true;
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// Parse the arguments.
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std::unique_ptr<OptTable> OptTbl(createDriverOptTable());
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const unsigned IncludedFlagsBitmask = options::CC1AsOption;
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unsigned MissingArgIndex, MissingArgCount;
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InputArgList Args = OptTbl->ParseArgs(Argv, MissingArgIndex, MissingArgCount,
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IncludedFlagsBitmask);
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// Check for missing argument error.
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if (MissingArgCount) {
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Diags.Report(diag::err_drv_missing_argument)
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<< Args.getArgString(MissingArgIndex) << MissingArgCount;
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Success = false;
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}
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// Issue errors on unknown arguments.
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for (const Arg *A : Args.filtered(OPT_UNKNOWN)) {
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Diags.Report(diag::err_drv_unknown_argument) << A->getAsString(Args);
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Success = false;
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}
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// Construct the invocation.
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// Target Options
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Opts.Triple = llvm::Triple::normalize(Args.getLastArgValue(OPT_triple));
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Opts.CPU = Args.getLastArgValue(OPT_target_cpu);
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Opts.Features = Args.getAllArgValues(OPT_target_feature);
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// Use the default target triple if unspecified.
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if (Opts.Triple.empty())
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Opts.Triple = llvm::sys::getDefaultTargetTriple();
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// Language Options
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Opts.IncludePaths = Args.getAllArgValues(OPT_I);
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Opts.NoInitialTextSection = Args.hasArg(OPT_n);
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Opts.SaveTemporaryLabels = Args.hasArg(OPT_msave_temp_labels);
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// Any DebugInfoKind implies GenDwarfForAssembly.
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Opts.GenDwarfForAssembly = Args.hasArg(OPT_debug_info_kind_EQ);
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if (const Arg *A = Args.getLastArg(OPT_compress_debug_sections,
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OPT_compress_debug_sections_EQ)) {
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if (A->getOption().getID() == OPT_compress_debug_sections) {
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// TODO: be more clever about the compression type auto-detection
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Opts.CompressDebugSections = llvm::DebugCompressionType::GNU;
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} else {
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Opts.CompressDebugSections =
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llvm::StringSwitch<llvm::DebugCompressionType>(A->getValue())
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.Case("none", llvm::DebugCompressionType::None)
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.Case("zlib", llvm::DebugCompressionType::Z)
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.Case("zlib-gnu", llvm::DebugCompressionType::GNU)
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.Default(llvm::DebugCompressionType::None);
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}
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}
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Opts.RelaxELFRelocations = Args.hasArg(OPT_mrelax_relocations);
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Opts.DwarfVersion = getLastArgIntValue(Args, OPT_dwarf_version_EQ, 2, Diags);
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Opts.DwarfDebugFlags = Args.getLastArgValue(OPT_dwarf_debug_flags);
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Opts.DwarfDebugProducer = Args.getLastArgValue(OPT_dwarf_debug_producer);
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Opts.DebugCompilationDir = Args.getLastArgValue(OPT_fdebug_compilation_dir);
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Opts.MainFileName = Args.getLastArgValue(OPT_main_file_name);
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// Frontend Options
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if (Args.hasArg(OPT_INPUT)) {
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bool First = true;
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for (const Arg *A : Args.filtered(OPT_INPUT)) {
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if (First) {
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Opts.InputFile = A->getValue();
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First = false;
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} else {
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Diags.Report(diag::err_drv_unknown_argument) << A->getAsString(Args);
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Success = false;
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}
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}
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}
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Opts.LLVMArgs = Args.getAllArgValues(OPT_mllvm);
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Opts.OutputPath = Args.getLastArgValue(OPT_o);
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if (Arg *A = Args.getLastArg(OPT_filetype)) {
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StringRef Name = A->getValue();
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unsigned OutputType = StringSwitch<unsigned>(Name)
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.Case("asm", FT_Asm)
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.Case("null", FT_Null)
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.Case("obj", FT_Obj)
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.Default(~0U);
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if (OutputType == ~0U) {
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Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
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Success = false;
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} else
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Opts.OutputType = FileType(OutputType);
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}
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Opts.ShowHelp = Args.hasArg(OPT_help);
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Opts.ShowVersion = Args.hasArg(OPT_version);
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// Transliterate Options
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Opts.OutputAsmVariant =
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getLastArgIntValue(Args, OPT_output_asm_variant, 0, Diags);
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Opts.ShowEncoding = Args.hasArg(OPT_show_encoding);
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Opts.ShowInst = Args.hasArg(OPT_show_inst);
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// Assemble Options
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Opts.RelaxAll = Args.hasArg(OPT_mrelax_all);
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Opts.NoExecStack = Args.hasArg(OPT_mno_exec_stack);
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Opts.FatalWarnings = Args.hasArg(OPT_massembler_fatal_warnings);
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Opts.RelocationModel = Args.getLastArgValue(OPT_mrelocation_model, "pic");
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Opts.IncrementalLinkerCompatible =
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Args.hasArg(OPT_mincremental_linker_compatible);
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Opts.SymbolDefs = Args.getAllArgValues(OPT_defsym);
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return Success;
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}
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static std::unique_ptr<raw_fd_ostream>
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getOutputStream(AssemblerInvocation &Opts, DiagnosticsEngine &Diags,
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bool Binary) {
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if (Opts.OutputPath.empty())
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Opts.OutputPath = "-";
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// Make sure that the Out file gets unlinked from the disk if we get a
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// SIGINT.
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if (Opts.OutputPath != "-")
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sys::RemoveFileOnSignal(Opts.OutputPath);
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std::error_code EC;
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auto Out = llvm::make_unique<raw_fd_ostream>(
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Opts.OutputPath, EC, (Binary ? sys::fs::F_None : sys::fs::F_Text));
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if (EC) {
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Diags.Report(diag::err_fe_unable_to_open_output) << Opts.OutputPath
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<< EC.message();
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return nullptr;
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}
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return Out;
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}
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static bool ExecuteAssembler(AssemblerInvocation &Opts,
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DiagnosticsEngine &Diags) {
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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(Opts.Triple, Error);
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if (!TheTarget)
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return Diags.Report(diag::err_target_unknown_triple) << Opts.Triple;
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ErrorOr<std::unique_ptr<MemoryBuffer>> Buffer =
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MemoryBuffer::getFileOrSTDIN(Opts.InputFile);
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if (std::error_code EC = Buffer.getError()) {
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Error = EC.message();
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return Diags.Report(diag::err_fe_error_reading) << Opts.InputFile;
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}
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SourceMgr SrcMgr;
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// Tell SrcMgr about this buffer, which is what the parser will pick up.
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SrcMgr.AddNewSourceBuffer(std::move(*Buffer), SMLoc());
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// Record the location of the include directories so that the lexer can find
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// it later.
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SrcMgr.setIncludeDirs(Opts.IncludePaths);
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std::unique_ptr<MCRegisterInfo> MRI(TheTarget->createMCRegInfo(Opts.Triple));
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assert(MRI && "Unable to create target register info!");
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std::unique_ptr<MCAsmInfo> MAI(TheTarget->createMCAsmInfo(*MRI, Opts.Triple));
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assert(MAI && "Unable to create target asm info!");
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// Ensure MCAsmInfo initialization occurs before any use, otherwise sections
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// may be created with a combination of default and explicit settings.
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MAI->setCompressDebugSections(Opts.CompressDebugSections);
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MAI->setRelaxELFRelocations(Opts.RelaxELFRelocations);
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bool IsBinary = Opts.OutputType == AssemblerInvocation::FT_Obj;
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std::unique_ptr<raw_fd_ostream> FDOS = getOutputStream(Opts, Diags, IsBinary);
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if (!FDOS)
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return true;
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// FIXME: This is not pretty. MCContext has a ptr to MCObjectFileInfo and
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// MCObjectFileInfo needs a MCContext reference in order to initialize itself.
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std::unique_ptr<MCObjectFileInfo> MOFI(new MCObjectFileInfo());
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MCContext Ctx(MAI.get(), MRI.get(), MOFI.get(), &SrcMgr);
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bool PIC = false;
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if (Opts.RelocationModel == "static") {
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PIC = false;
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} else if (Opts.RelocationModel == "pic") {
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PIC = true;
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} else {
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assert(Opts.RelocationModel == "dynamic-no-pic" &&
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"Invalid PIC model!");
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PIC = false;
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}
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MOFI->InitMCObjectFileInfo(Triple(Opts.Triple), PIC, Ctx);
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if (Opts.SaveTemporaryLabels)
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Ctx.setAllowTemporaryLabels(false);
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if (Opts.GenDwarfForAssembly)
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Ctx.setGenDwarfForAssembly(true);
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if (!Opts.DwarfDebugFlags.empty())
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Ctx.setDwarfDebugFlags(StringRef(Opts.DwarfDebugFlags));
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if (!Opts.DwarfDebugProducer.empty())
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Ctx.setDwarfDebugProducer(StringRef(Opts.DwarfDebugProducer));
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if (!Opts.DebugCompilationDir.empty())
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Ctx.setCompilationDir(Opts.DebugCompilationDir);
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if (!Opts.MainFileName.empty())
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Ctx.setMainFileName(StringRef(Opts.MainFileName));
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Ctx.setDwarfVersion(Opts.DwarfVersion);
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// Build up the feature string from the target feature list.
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std::string FS;
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if (!Opts.Features.empty()) {
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FS = Opts.Features[0];
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for (unsigned i = 1, e = Opts.Features.size(); i != e; ++i)
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FS += "," + Opts.Features[i];
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}
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std::unique_ptr<MCStreamer> Str;
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std::unique_ptr<MCInstrInfo> MCII(TheTarget->createMCInstrInfo());
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std::unique_ptr<MCSubtargetInfo> STI(
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TheTarget->createMCSubtargetInfo(Opts.Triple, Opts.CPU, FS));
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raw_pwrite_stream *Out = FDOS.get();
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std::unique_ptr<buffer_ostream> BOS;
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// FIXME: There is a bit of code duplication with addPassesToEmitFile.
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if (Opts.OutputType == AssemblerInvocation::FT_Asm) {
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MCInstPrinter *IP = TheTarget->createMCInstPrinter(
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llvm::Triple(Opts.Triple), Opts.OutputAsmVariant, *MAI, *MCII, *MRI);
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MCCodeEmitter *CE = nullptr;
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MCAsmBackend *MAB = nullptr;
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if (Opts.ShowEncoding) {
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CE = TheTarget->createMCCodeEmitter(*MCII, *MRI, Ctx);
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MCTargetOptions Options;
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MAB = TheTarget->createMCAsmBackend(*STI, *MRI, Options);
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}
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auto FOut = llvm::make_unique<formatted_raw_ostream>(*Out);
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Str.reset(TheTarget->createAsmStreamer(
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Ctx, std::move(FOut), /*asmverbose*/ true,
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/*useDwarfDirectory*/ true, IP, CE, MAB, Opts.ShowInst));
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} else if (Opts.OutputType == AssemblerInvocation::FT_Null) {
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Str.reset(createNullStreamer(Ctx));
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} else {
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assert(Opts.OutputType == AssemblerInvocation::FT_Obj &&
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"Invalid file type!");
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if (!FDOS->supportsSeeking()) {
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BOS = make_unique<buffer_ostream>(*FDOS);
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Out = BOS.get();
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}
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MCCodeEmitter *CE = TheTarget->createMCCodeEmitter(*MCII, *MRI, Ctx);
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MCTargetOptions Options;
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MCAsmBackend *MAB = TheTarget->createMCAsmBackend(*STI, *MRI, Options);
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Triple T(Opts.Triple);
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Str.reset(TheTarget->createMCObjectStreamer(
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T, Ctx, std::unique_ptr<MCAsmBackend>(MAB), *Out, std::unique_ptr<MCCodeEmitter>(CE), *STI,
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Opts.RelaxAll, Opts.IncrementalLinkerCompatible,
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/*DWARFMustBeAtTheEnd*/ true));
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Str.get()->InitSections(Opts.NoExecStack);
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}
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bool Failed = false;
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std::unique_ptr<MCAsmParser> Parser(
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createMCAsmParser(SrcMgr, Ctx, *Str.get(), *MAI));
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// FIXME: init MCTargetOptions from sanitizer flags here.
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MCTargetOptions Options;
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std::unique_ptr<MCTargetAsmParser> TAP(
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TheTarget->createMCAsmParser(*STI, *Parser, *MCII, Options));
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if (!TAP)
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Failed = Diags.Report(diag::err_target_unknown_triple) << Opts.Triple;
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// Set values for symbols, if any.
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for (auto &S : Opts.SymbolDefs) {
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auto Pair = StringRef(S).split('=');
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auto Sym = Pair.first;
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auto Val = Pair.second;
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int64_t Value = 0;
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// We have already error checked this in the driver.
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Val.getAsInteger(0, Value);
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Ctx.setSymbolValue(Parser->getStreamer(), Sym, Value);
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}
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if (!Failed) {
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Parser->setTargetParser(*TAP.get());
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Failed = Parser->Run(Opts.NoInitialTextSection);
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}
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// Close Streamer first.
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// It might have a reference to the output stream.
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Str.reset();
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// Close the output stream early.
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BOS.reset();
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FDOS.reset();
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// Delete output file if there were errors.
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if (Failed && Opts.OutputPath != "-")
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sys::fs::remove(Opts.OutputPath);
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return Failed;
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}
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static void LLVMErrorHandler(void *UserData, const std::string &Message,
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bool GenCrashDiag) {
|
|
DiagnosticsEngine &Diags = *static_cast<DiagnosticsEngine*>(UserData);
|
|
|
|
Diags.Report(diag::err_fe_error_backend) << Message;
|
|
|
|
// We cannot recover from llvm errors.
|
|
exit(1);
|
|
}
|
|
|
|
int cc1as_main(ArrayRef<const char *> Argv, const char *Argv0, void *MainAddr) {
|
|
// Initialize targets and assembly printers/parsers.
|
|
InitializeAllTargetInfos();
|
|
InitializeAllTargetMCs();
|
|
InitializeAllAsmParsers();
|
|
|
|
// Construct our diagnostic client.
|
|
IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();
|
|
TextDiagnosticPrinter *DiagClient
|
|
= new TextDiagnosticPrinter(errs(), &*DiagOpts);
|
|
DiagClient->setPrefix("clang -cc1as");
|
|
IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
|
|
DiagnosticsEngine Diags(DiagID, &*DiagOpts, DiagClient);
|
|
|
|
// Set an error handler, so that any LLVM backend diagnostics go through our
|
|
// error handler.
|
|
ScopedFatalErrorHandler FatalErrorHandler
|
|
(LLVMErrorHandler, static_cast<void*>(&Diags));
|
|
|
|
// Parse the arguments.
|
|
AssemblerInvocation Asm;
|
|
if (!AssemblerInvocation::CreateFromArgs(Asm, Argv, Diags))
|
|
return 1;
|
|
|
|
if (Asm.ShowHelp) {
|
|
std::unique_ptr<OptTable> Opts(driver::createDriverOptTable());
|
|
Opts->PrintHelp(llvm::outs(), "clang -cc1as", "Clang Integrated Assembler",
|
|
/*Include=*/driver::options::CC1AsOption, /*Exclude=*/0,
|
|
/*ShowAllAliases=*/false);
|
|
return 0;
|
|
}
|
|
|
|
// Honor -version.
|
|
//
|
|
// FIXME: Use a better -version message?
|
|
if (Asm.ShowVersion) {
|
|
llvm::cl::PrintVersionMessage();
|
|
return 0;
|
|
}
|
|
|
|
// Honor -mllvm.
|
|
//
|
|
// FIXME: Remove this, one day.
|
|
if (!Asm.LLVMArgs.empty()) {
|
|
unsigned NumArgs = Asm.LLVMArgs.size();
|
|
auto Args = llvm::make_unique<const char*[]>(NumArgs + 2);
|
|
Args[0] = "clang (LLVM option parsing)";
|
|
for (unsigned i = 0; i != NumArgs; ++i)
|
|
Args[i + 1] = Asm.LLVMArgs[i].c_str();
|
|
Args[NumArgs + 1] = nullptr;
|
|
llvm::cl::ParseCommandLineOptions(NumArgs + 1, Args.get());
|
|
}
|
|
|
|
// Execute the invocation, unless there were parsing errors.
|
|
bool Failed = Diags.hasErrorOccurred() || ExecuteAssembler(Asm, Diags);
|
|
|
|
// If any timers were active but haven't been destroyed yet, print their
|
|
// results now.
|
|
TimerGroup::printAll(errs());
|
|
|
|
return !!Failed;
|
|
}
|