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https://github.com/c64scene-ar/llvm-6502.git
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* convert over to pass based target backend. Much cleaner now git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1665 91177308-0d34-0410-b5e6-96231b3b80d8
161 lines
5.5 KiB
C++
161 lines
5.5 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/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 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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// 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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// 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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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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