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//===-- llc.cpp - Implement the LLVM Compiler -----------------------------===//
//
// This is the llc compiler driver.
//
//===----------------------------------------------------------------------===//
#include "llvm/Bytecode/Reader.h"
#include "llvm/Target/Sparc.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Transforms/Instrumentation/TraceValues.h"
#include "llvm/Transforms/ChangeAllocations.h"
#include "llvm/Transforms/HoistPHIConstants.h"
#include "llvm/Transforms/Scalar/DecomposeMultiDimRefs.h"
#include "llvm/Assembly/PrintModulePass.h"
#include "llvm/Bytecode/WriteBytecodePass.h"
#include "llvm/Transforms/ConstantMerge.h"
#include "llvm/Module.h"
#include "llvm/Function.h"
#include "llvm/PassManager.h"
#include "Support/CommandLine.h"
#include <memory>
#include <string>
#include <fstream>
using std::string;
static cl::String InputFilename ("", "Input filename", cl::NoFlags, "-");
static cl::String OutputFilename("o", "Output filename", cl::NoFlags, "");
static cl::Flag Force ("f", "Overwrite output files");
static cl::Flag DumpAsm ("d", "Print bytecode before native code generation", cl::Hidden);
enum TraceLevel {
TraceOff, TraceFunctions, TraceBasicBlocks
};
static cl::Enum<enum TraceLevel> TraceValues("trace", cl::NoFlags,
"Trace values through functions or basic blocks",
clEnumValN(TraceOff , "off", "Disable trace code"),
clEnumValN(TraceFunctions , "function", "Trace each function"),
clEnumValN(TraceBasicBlocks, "basicblock", "Trace each basic block"), 0);
// GetFileNameRoot - Helper function to get the basename of a filename...
static inline string GetFileNameRoot(const string &InputFilename) {
string IFN = InputFilename;
string outputFilename;
int Len = IFN.length();
if (IFN[Len-3] == '.' && IFN[Len-2] == 'b' && IFN[Len-1] == 'c') {
outputFilename = string(IFN.begin(), IFN.end()-3); // s/.bc/.s/
} else {
outputFilename = IFN;
}
return outputFilename;
}
//===---------------------------------------------------------------------===//
// Function main()
//
// Entry point for the llc compiler.
//===---------------------------------------------------------------------===//
int main(int argc, char **argv) {
cl::ParseCommandLineOptions(argc, argv, " llvm system compiler\n");
// Allocate a target... in the future this will be controllable on the
// command line.
std::auto_ptr<TargetMachine> target(allocateSparcTargetMachine());
assert(target.get() && "Could not allocate target machine!");
TargetMachine &Target = *target.get();
// Load the module to be compiled...
std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename));
if (M.get() == 0) {
cerr << "bytecode didn't read correctly.\n";
return 1;
}
// Build up all of the passes that we want to do to the module...
PassManager Passes;
// Hoist constants out of PHI nodes into predecessor BB's
Passes.add(createHoistPHIConstantsPass());
if (TraceValues != TraceOff) { // If tracing enabled...
// Insert trace code in all functions in the module
if (TraceValues == TraceBasicBlocks)
Passes.add(createTraceValuesPassForBasicBlocks());
else if (TraceValues == TraceFunctions)
Passes.add(createTraceValuesPassForMethod());
else
assert(0 && "Bad value for TraceValues!");
// Eliminate duplication in constant pool
Passes.add(createDynamicConstantMergePass());
}
// Decompose multi-dimensional refs into a sequence of 1D refs
Passes.add(createDecomposeMultiDimRefsPass());
// Write out the module with tracing code just before code generation
if (TraceValues != TraceOff) { // If tracing enabled...
assert(InputFilename != "-" &&
"files on stdin not supported with tracing");
string traceFileName = GetFileNameRoot(InputFilename) + ".trace.bc";
if (!Force && std::ifstream(OutputFilename.c_str())) {
// If force is not specified, make sure not to overwrite a file!
cerr << "Error opening '" << OutputFilename << "': File exists!\n"
<< "Use -f command line argument to force output\n";
return 1;
}
std::ostream *os = new std::ofstream(traceFileName.c_str());
if (!os->good()) {
cerr << "Error opening " << traceFileName
<< "! SKIPPING OUTPUT OF TRACE CODE\n";
delete os;
return 1;
}
Passes.add(new WriteBytecodePass(os, true));
}
// Replace malloc and free instructions with library calls.
// Do this after tracing until lli implements these lib calls.
// For now, it will emulate malloc and free internally.
Passes.add(createLowerAllocationsPass(Target.DataLayout));
// If LLVM dumping after transformations is requested, add it to the pipeline
if (DumpAsm)
Passes.add(new PrintFunctionPass("Code after xformations: \n", &cerr));
// Figure out where we are going to send the output...
std::ostream *Out = 0;
if (OutputFilename != "") { // Specified an output filename?
if (!Force && std::ifstream(OutputFilename.c_str())) {
// If force is not specified, make sure not to overwrite a file!
cerr << "Error opening '" << OutputFilename << "': File exists!\n"
<< "Use -f command line argument to force output\n";
return 1;
}
Out = new std::ofstream(OutputFilename.c_str());
} else {
if (InputFilename == "-") {
OutputFilename = "-";
Out = &std::cout;
} else {
string OutputFilename = GetFileNameRoot(InputFilename);
OutputFilename += ".s";
if (!Force && std::ifstream(OutputFilename.c_str())) {
// If force is not specified, make sure not to overwrite a file!
cerr << "Error opening '" << OutputFilename << "': File exists!\n"
<< "Use -f command line argument to force output\n";
return 1;
}
Out = new std::ofstream(OutputFilename.c_str());
if (!Out->good()) {
cerr << "Error opening " << OutputFilename << "!\n";
delete Out;
return 1;
}
}
}
Target.addPassesToEmitAssembly(Passes, *Out);
// Run our queue of passes all at once now, efficiently.
Passes.run(M.get());
if (Out != &std::cout) delete Out;
return 0;
}
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