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This pass: 1. Splits TargetMachine into TargetMachine (generic targets, can be implemented any way, like the CBE) and LLVMTargetMachine (subclass of TM that is used by things using libcodegen and other support). 2. Instead of having each target fully populate the passmgr for file or JIT output, move all this to common code, and give targets hooks they can implement. 3. Commonalize the target population stuff between file emission and JIT emission. 4. All (native code) codegen stuff now happens in a FunctionPassManager, which paves the way for "fast -O0" stuff in the CFE later, and now LLC could lazily stream .bc files from disk to use less memory. 5. There are now many fewer #includes and the targets don't depend on the scalar xforms or libanalysis anymore (but codegen does). 6. Changing common code generator pass ordering stuff no longer requires touching all targets. 7. The JIT now has the option of "-fast" codegen or normal optimized codegen, which is now orthogonal to the fact that JIT'ing is being done. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30081 91177308-0d34-0410-b5e6-96231b3b80d8
278 lines
9.4 KiB
C++
278 lines
9.4 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 was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source 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 bytecode.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Bytecode/Reader.h"
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#include "llvm/CodeGen/LinkAllCodegenComponents.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/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/PluginLoader.h"
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#include "llvm/Support/FileUtilities.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 bytecode>"), 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, TargetNameParser>
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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 std::ostream *GetOutputStream(const char *ProgName) {
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if (OutputFilename != "") {
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if (OutputFilename == "-")
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return &std::cout;
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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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return new std::ofstream(OutputFilename.c_str());
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}
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if (InputFilename == "-") {
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OutputFilename = "-";
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return &std::cout;
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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' || MArch->Name[1] != 0) // not CBE
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OutputFilename += ".s";
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else
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OutputFilename += ".cbe.c";
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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::ostream *Out = new std::ofstream(OutputFilename.c_str());
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if (!Out->good()) {
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std::cerr << ProgName << ": error opening " << OutputFilename << "!\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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try {
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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::auto_ptr<Module> M(ParseBytecodeFile(InputFilename));
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if (M.get() == 0) {
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std::cerr << argv[0] << ": bytecode didn't read correctly.\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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std::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 != &std::cout) 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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FunctionPassManager Passes(new ExistingModuleProvider(M.get()));
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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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if (Target.addPassesToEmitFile(Passes, *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 != &std::cout) 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->isExternal())
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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 != &std::cout) delete Out;
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return 0;
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} catch (const std::string& msg) {
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std::cerr << argv[0] << ": " << msg << "\n";
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} catch (...) {
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std::cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
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}
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return 1;
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}
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