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221 lines
7.5 KiB
C++
221 lines
7.5 KiB
C++
//===-- llc.cpp - Implement the LLVM Compiler -----------------------------===//
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//
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// This is the llc compiler driver.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Bytecode/Reader.h"
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#include "llvm/Target/Sparc.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Transforms/Instrumentation/TraceValues.h"
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#include "llvm/Transforms/ChangeAllocations.h"
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#include "llvm/Transforms/Scalar.h"
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#include "llvm/Transforms/Utils/Linker.h"
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#include "llvm/Assembly/PrintModulePass.h"
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#include "llvm/Bytecode/WriteBytecodePass.h"
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#include "llvm/Transforms/ConstantMerge.h"
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#include "llvm/Module.h"
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#include "llvm/Function.h"
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#include "llvm/PassManager.h"
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#include "Support/CommandLine.h"
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#include "Support/Signals.h"
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#include <memory>
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#include <fstream>
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using std::string;
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using std::cerr;
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static cl::String InputFilename ("", "Input filename", cl::NoFlags, "-");
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static cl::String OutputFilename("o", "Output filename", cl::NoFlags, "");
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static cl::Flag Force ("f", "Overwrite output files");
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static cl::Flag DumpAsm ("d", "Print bytecode before native code generation", cl::Hidden);
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static cl::String TraceLibPath ("tracelibpath", "Path to libinstr for trace code", cl::Hidden, "");
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enum TraceLevel {
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TraceOff, TraceFunctions, TraceBasicBlocks
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};
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static cl::Enum<enum TraceLevel> TraceValues("trace", cl::NoFlags,
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"Trace values through functions or basic blocks",
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clEnumValN(TraceOff , "off", "Disable trace code"),
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clEnumValN(TraceFunctions , "function", "Trace each function"),
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clEnumValN(TraceBasicBlocks, "basicblock", "Trace each basic block"), 0);
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// GetFileNameRoot - Helper function to get the basename of a filename...
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static inline string GetFileNameRoot(const string &InputFilename) {
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string IFN = InputFilename;
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string outputFilename;
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int Len = IFN.length();
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if (IFN[Len-3] == '.' && IFN[Len-2] == 'b' && IFN[Len-1] == 'c') {
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outputFilename = 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 void insertTraceCodeFor(Module &M) {
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PassManager Passes;
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// Insert trace code in all functions in the module
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switch (TraceValues) {
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case TraceBasicBlocks:
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Passes.add(createTraceValuesPassForBasicBlocks());
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break;
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case TraceFunctions:
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Passes.add(createTraceValuesPassForFunction());
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break;
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default:
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assert(0 && "Bad value for TraceValues!");
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abort();
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}
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// Eliminate duplication in constant pool
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Passes.add(createConstantMergePass());
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// Run passes to insert and clean up trace code...
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Passes.run(M);
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std::string ErrorMessage;
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// Load the module that contains the runtime helper routines neccesary for
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// pointer hashing and stuff... link this module into the program if possible
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//
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Module *TraceModule = ParseBytecodeFile(TraceLibPath+"libinstr.bc");
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// Ok, the TraceLibPath didn't contain a valid module. Try to load the module
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// from the current LLVM-GCC install directory. This is kindof a hack, but
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// allows people to not HAVE to have built the library.
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//
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if (TraceModule == 0)
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TraceModule = ParseBytecodeFile("/home/vadve/lattner/cvs/gcc_install/lib/"
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"gcc-lib/llvm/3.1/libinstr.bc");
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// If we still didn't get it, cancel trying to link it in...
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if (TraceModule == 0) {
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cerr << "Warning, could not load trace routines to link into program!\n";
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} else {
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// Link in the trace routines... if the link fails, don't panic, because the
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// compile should still succeed, just the native linker will probably fail.
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//
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std::auto_ptr<Module> TraceRoutines(TraceModule);
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if (LinkModules(&M, TraceRoutines.get(), &ErrorMessage))
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cerr << "Warning: Error linking in trace routines: "
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<< ErrorMessage << "\n";
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}
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// Write out the module with tracing code just before code generation
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if (InputFilename != "-") {
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string TraceFilename = GetFileNameRoot(InputFilename) + ".trace.bc";
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std::ofstream Out(TraceFilename.c_str());
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if (!Out.good()) {
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cerr << "Error opening '" << TraceFilename
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<< "'!: Skipping output of trace code as bytecode\n";
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} else {
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cerr << "Emitting trace code to '" << TraceFilename
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<< "' for comparison...\n";
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WriteBytecodeToFile(&M, Out);
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}
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}
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}
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//===---------------------------------------------------------------------===//
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// Function main()
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//
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// Entry point for the llc compiler.
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//===---------------------------------------------------------------------===//
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int main(int argc, char **argv) {
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cl::ParseCommandLineOptions(argc, argv, " llvm system compiler\n");
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// Allocate a target... in the future this will be controllable on the
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// command line.
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std::auto_ptr<TargetMachine> target(allocateSparcTargetMachine());
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assert(target.get() && "Could not allocate target machine!");
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TargetMachine &Target = *target.get();
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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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cerr << "bytecode didn't read correctly.\n";
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return 1;
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}
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if (TraceValues != TraceOff) // If tracing enabled...
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insertTraceCodeFor(*M.get()); // Hack up module before using passmanager...
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// Build up all of the passes that we want to do to the module...
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PassManager Passes;
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// Decompose multi-dimensional refs into a sequence of 1D refs
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Passes.add(createDecomposeMultiDimRefsPass());
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// Replace malloc and free instructions with library calls.
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// Do this after tracing until lli implements these lib calls.
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// For now, it will emulate malloc and free internally.
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Passes.add(createLowerAllocationsPass(Target.DataLayout));
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// If LLVM dumping after transformations is requested, add it to the pipeline
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if (DumpAsm)
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Passes.add(new PrintFunctionPass("Code after xformations: \n", &cerr));
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// Strip all of the symbols from the bytecode so that it will be smaller...
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Passes.add(createSymbolStrippingPass());
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// Figure out where we are going to send the output...
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std::ostream *Out = 0;
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if (OutputFilename != "") { // 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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cerr << "Error opening '" << OutputFilename << "': File exists!\n"
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<< "Use -f command line argument to force output\n";
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return 1;
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}
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Out = new std::ofstream(OutputFilename.c_str());
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// Make sure that the Out file gets unlink'd from the disk if we get a
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// SIGINT
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RemoveFileOnSignal(OutputFilename);
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} else {
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if (InputFilename == "-") {
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OutputFilename = "-";
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Out = &std::cout;
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} else {
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string OutputFilename = GetFileNameRoot(InputFilename);
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OutputFilename += ".s";
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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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cerr << "Error opening '" << OutputFilename << "': File exists!\n"
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<< "Use -f command line argument to force output\n";
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return 1;
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}
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Out = new std::ofstream(OutputFilename.c_str());
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if (!Out->good()) {
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cerr << "Error opening " << OutputFilename << "!\n";
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delete Out;
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return 1;
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}
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// Make sure that the Out file gets unlink'd from the disk if we get a
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// SIGINT
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RemoveFileOnSignal(OutputFilename);
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}
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}
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Target.addPassesToEmitAssembly(Passes, *Out);
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// Run our queue of passes all at once now, efficiently.
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Passes.run(*M.get());
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if (Out != &std::cout) delete Out;
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return 0;
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}
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