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70f03681e8
MethodPass's now cannot be run on external methods llvm-svn: 1609
215 lines
7.2 KiB
C++
215 lines
7.2 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/HoistPHIConstants.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/Method.h"
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#include "llvm/PassManager.h"
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#include "Support/CommandLine.h"
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#include <memory>
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#include <string>
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#include <fstream>
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using std::string;
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cl::String InputFilename ("", "Input filename", cl::NoFlags, "-");
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cl::String OutputFilename("o", "Output filename", cl::NoFlags, "");
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cl::Flag Force ("f", "Overwrite output files");
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cl::Flag DumpAsm ("d", "Print bytecode before native code generation",
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cl::Hidden);
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cl::Flag DoNotEmitAssembly("noasm", "Do not emit assembly code", cl::Hidden);
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cl::Flag TraceBBValues ("trace",
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"Trace values at basic block and method exits");
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cl::Flag TraceMethodValues("tracem", "Trace values only at method exits");
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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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//===---------------------------------------------------------------------===//
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// GenerateCodeForTarget Pass
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//
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// Native code generation for a specified target.
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//===---------------------------------------------------------------------===//
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class GenerateCodeForTarget : public MethodPass {
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TargetMachine &Target;
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public:
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inline GenerateCodeForTarget(TargetMachine &T) : Target(T) {}
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// runOnMethod - This method does the actual work of generating code for
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// the specified method.
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//
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bool runOnMethod(Method *M) {
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if (Target.compileMethod(M))
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cerr << "Error compiling " << InputFilename << "!\n";
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return true;
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}
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};
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//===---------------------------------------------------------------------===//
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// EmitAssembly Pass
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//
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// Write assembly code to specified output stream
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//===---------------------------------------------------------------------===//
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class EmitAssembly : public Pass {
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const TargetMachine &Target; // Target to compile for
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std::ostream *Out; // Stream to print on
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bool DeleteStream; // Delete stream in dtor?
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public:
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inline EmitAssembly(const TargetMachine &T, std::ostream *O, bool D)
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: Target(T), Out(O), DeleteStream(D) {}
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virtual bool run(Module *M) {
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Target.emitAssembly(M, *Out);
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if (DeleteStream) delete Out;
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return false;
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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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// Build up all of the passes that we want to do to the module...
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PassManager Passes;
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// Hoist constants out of PHI nodes into predecessor BB's
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Passes.add(new HoistPHIConstants());
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if (TraceBBValues || TraceMethodValues) { // If tracing enabled...
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// Insert trace code in all methods in the module
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Passes.add(new InsertTraceCode(TraceBBValues,
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TraceBBValues ||TraceMethodValues));
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// Eliminate duplication in constant pool
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Passes.add(new DynamicConstantMerge());
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// Then write out the module with tracing code before code generation
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assert(InputFilename != "-" &&
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"files on stdin not supported with tracing");
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string traceFileName = GetFileNameRoot(InputFilename) + ".trace.bc";
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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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std::ostream *os = new std::ofstream(traceFileName.c_str());
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if (!os->good()) {
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cerr << "Error opening " << traceFileName
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<< "! SKIPPING OUTPUT OF TRACE CODE\n";
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delete os;
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return 1;
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}
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Passes.add(new WriteBytecodePass(os, true));
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}
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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(new LowerAllocations(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 PrintMethodPass("Code after xformations: \n",&cerr));
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// Generate Target code...
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Passes.add(new GenerateCodeForTarget(Target));
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if (!DoNotEmitAssembly) { // If asm output is enabled...
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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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} 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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}
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}
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// Output assembly language to the .s file
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Passes.add(new EmitAssembly(Target, Out, Out != &std::cout));
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}
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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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return 0;
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}
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