mirror of
https://github.com/c64scene-ar/llvm-6502.git
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b8cab9227a
instead of requiring all "short description" strings to begin with two spaces. This makes these strings less mysterious, and it fixes some cases where short description strings mistakenly did not begin with two spaces. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57521 91177308-0d34-0410-b5e6-96231b3b80d8
323 lines
10 KiB
C++
323 lines
10 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/Bitcode/ReaderWriter.h"
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#include "llvm/CodeGen/FileWriters.h"
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#include "llvm/CodeGen/LinkAllCodegenComponents.h"
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#include "llvm/CodeGen/LinkAllAsmWriterComponents.h"
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#include "llvm/Target/SubtargetFeature.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetMachineRegistry.h"
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#include "llvm/Transforms/Scalar.h"
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#include "llvm/Module.h"
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#include "llvm/ModuleProvider.h"
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#include "llvm/PassManager.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/ManagedStatic.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/PluginLoader.h"
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#include "llvm/Support/FileUtilities.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Analysis/Verifier.h"
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#include "llvm/System/Signals.h"
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#include "llvm/Config/config.h"
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#include "llvm/LinkAllVMCore.h"
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#include <fstream>
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#include <iostream>
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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<bool> Force("f", cl::desc("Overwrite output files"));
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static cl::opt<bool> Fast("fast",
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cl::desc("Generate code quickly, potentially sacrificing code quality"));
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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<const TargetMachineRegistry::entry*, false,
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TargetMachineRegistry::Parser>
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MArch("march", cl::desc("Architecture to generate code for:"));
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static cl::opt<std::string>
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MCPU("mcpu",
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cl::desc("Target a specific cpu type (-mcpu=help for details)"),
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cl::value_desc("cpu-name"),
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cl::init(""));
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static cl::list<std::string>
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MAttrs("mattr",
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cl::CommaSeparated,
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cl::desc("Target specific attributes (-mattr=help for details)"),
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cl::value_desc("a1,+a2,-a3,..."));
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cl::opt<TargetMachine::CodeGenFileType>
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FileType("filetype", cl::init(TargetMachine::AssemblyFile),
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cl::desc("Choose a file type (not all types are supported by all targets):"),
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cl::values(
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clEnumValN(TargetMachine::AssemblyFile, "asm",
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"Emit an assembly ('.s') file"),
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clEnumValN(TargetMachine::ObjectFile, "obj",
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"Emit a native object ('.o') file [experimental]"),
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clEnumValN(TargetMachine::DynamicLibrary, "dynlib",
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"Emit a native dynamic library ('.so') file"
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" [experimental]"),
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clEnumValEnd));
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cl::opt<bool> NoVerify("disable-verify", cl::Hidden,
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cl::desc("Do not verify input module"));
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// GetFileNameRoot - Helper function to get the basename of a filename.
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static inline std::string
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GetFileNameRoot(const std::string &InputFilename) {
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std::string IFN = InputFilename;
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std::string outputFilename;
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int Len = IFN.length();
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if ((Len > 2) &&
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IFN[Len-3] == '.' && IFN[Len-2] == 'b' && IFN[Len-1] == 'c') {
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outputFilename = std::string(IFN.begin(), IFN.end()-3); // s/.bc/.s/
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} else {
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outputFilename = IFN;
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}
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return outputFilename;
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}
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static raw_ostream *GetOutputStream(const char *ProgName) {
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if (OutputFilename != "") {
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if (OutputFilename == "-")
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return &outs();
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// Specified an output filename?
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if (!Force && std::ifstream(OutputFilename.c_str())) {
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// If force is not specified, make sure not to overwrite a file!
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std::cerr << ProgName << ": error opening '" << OutputFilename
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<< "': file exists!\n"
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<< "Use -f command line argument to force output\n";
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return 0;
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}
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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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sys::RemoveFileOnSignal(sys::Path(OutputFilename));
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std::string error;
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raw_ostream *Out = new raw_fd_ostream(OutputFilename.c_str(), error);
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if (!error.empty()) {
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std::cerr << error << '\n';
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delete Out;
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return 0;
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}
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return Out;
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}
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if (InputFilename == "-") {
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OutputFilename = "-";
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return &outs();
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}
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OutputFilename = GetFileNameRoot(InputFilename);
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switch (FileType) {
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case TargetMachine::AssemblyFile:
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if (MArch->Name[0] == 'c') {
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if (MArch->Name[1] == 0)
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OutputFilename += ".cbe.c";
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else if (MArch->Name[1] == 'p' && MArch->Name[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::ObjectFile:
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OutputFilename += ".o";
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break;
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case TargetMachine::DynamicLibrary:
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OutputFilename += LTDL_SHLIB_EXT;
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break;
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}
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if (!Force && std::ifstream(OutputFilename.c_str())) {
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// If force is not specified, make sure not to overwrite a file!
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std::cerr << ProgName << ": error opening '" << OutputFilename
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<< "': file exists!\n"
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<< "Use -f command line argument to force output\n";
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return 0;
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}
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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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sys::RemoveFileOnSignal(sys::Path(OutputFilename));
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std::string error;
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raw_ostream *Out = new raw_fd_ostream(OutputFilename.c_str(), error);
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if (!error.empty()) {
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std::cerr << error << '\n';
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delete Out;
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return 0;
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}
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return Out;
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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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llvm_shutdown_obj X; // Call llvm_shutdown() on exit.
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cl::ParseCommandLineOptions(argc, argv, "llvm system compiler\n");
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sys::PrintStackTraceOnErrorSignal();
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// Load the module to be compiled...
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std::string ErrorMessage;
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std::auto_ptr<Module> M;
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std::auto_ptr<MemoryBuffer> Buffer(
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MemoryBuffer::getFileOrSTDIN(InputFilename, &ErrorMessage));
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if (Buffer.get())
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M.reset(ParseBitcodeFile(Buffer.get(), &ErrorMessage));
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if (M.get() == 0) {
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std::cerr << argv[0] << ": bitcode didn't read correctly.\n";
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std::cerr << "Reason: " << ErrorMessage << "\n";
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return 1;
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}
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Module &mod = *M.get();
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// If we are supposed to override the target triple, do so now.
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if (!TargetTriple.empty())
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mod.setTargetTriple(TargetTriple);
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// Allocate target machine. First, check whether the user has
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// explicitly specified an architecture to compile for.
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if (MArch == 0) {
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std::string Err;
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MArch = TargetMachineRegistry::getClosestStaticTargetForModule(mod, Err);
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if (MArch == 0) {
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std::cerr << argv[0] << ": error auto-selecting target for module '"
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<< Err << "'. Please use the -march option to explicitly "
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<< "pick a target.\n";
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return 1;
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}
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}
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// Package up features to be passed to target/subtarget
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std::string FeaturesStr;
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if (MCPU.size() || MAttrs.size()) {
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SubtargetFeatures Features;
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Features.setCPU(MCPU);
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for (unsigned i = 0; i != MAttrs.size(); ++i)
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Features.AddFeature(MAttrs[i]);
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FeaturesStr = Features.getString();
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}
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std::auto_ptr<TargetMachine> target(MArch->CtorFn(mod, FeaturesStr));
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assert(target.get() && "Could not allocate target machine!");
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TargetMachine &Target = *target.get();
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// Figure out where we are going to send the output...
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raw_ostream *Out = GetOutputStream(argv[0]);
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if (Out == 0) return 1;
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// If this target requires addPassesToEmitWholeFile, do it now. This is
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// used by strange things like the C backend.
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if (Target.WantsWholeFile()) {
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PassManager PM;
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PM.add(new TargetData(*Target.getTargetData()));
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if (!NoVerify)
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PM.add(createVerifierPass());
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// Ask the target to add backend passes as necessary.
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if (Target.addPassesToEmitWholeFile(PM, *Out, FileType, Fast)) {
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std::cerr << argv[0] << ": target does not support generation of this"
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<< " file type!\n";
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if (Out != &outs()) delete Out;
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// And the Out file is empty and useless, so remove it now.
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sys::Path(OutputFilename).eraseFromDisk();
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return 1;
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}
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PM.run(mod);
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} else {
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// Build up all of the passes that we want to do to the module.
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ExistingModuleProvider Provider(M.release());
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FunctionPassManager Passes(&Provider);
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Passes.add(new TargetData(*Target.getTargetData()));
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#ifndef NDEBUG
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if (!NoVerify)
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Passes.add(createVerifierPass());
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#endif
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// Ask the target to add backend passes as necessary.
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MachineCodeEmitter *MCE = 0;
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switch (Target.addPassesToEmitFile(Passes, *Out, FileType, Fast)) {
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default:
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assert(0 && "Invalid file model!");
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return 1;
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case FileModel::Error:
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std::cerr << argv[0] << ": target does not support generation of this"
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<< " file type!\n";
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if (Out != &outs()) delete Out;
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// And the Out file is empty and useless, so remove it now.
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sys::Path(OutputFilename).eraseFromDisk();
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return 1;
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case FileModel::AsmFile:
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break;
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case FileModel::MachOFile:
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MCE = AddMachOWriter(Passes, *Out, Target);
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break;
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case FileModel::ElfFile:
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MCE = AddELFWriter(Passes, *Out, Target);
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break;
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}
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if (Target.addPassesToEmitFileFinish(Passes, MCE, Fast)) {
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std::cerr << argv[0] << ": target does not support generation of this"
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<< " file type!\n";
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if (Out != &outs()) delete Out;
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// And the Out file is empty and useless, so remove it now.
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sys::Path(OutputFilename).eraseFromDisk();
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return 1;
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}
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Passes.doInitialization();
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// Run our queue of passes all at once now, efficiently.
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// TODO: this could lazily stream functions out of the module.
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for (Module::iterator I = mod.begin(), E = mod.end(); I != E; ++I)
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if (!I->isDeclaration())
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Passes.run(*I);
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Passes.doFinalization();
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}
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// Delete the ostream if it's not a stdout stream
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if (Out != &outs()) delete Out;
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return 0;
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}
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