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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/LowerAllocations.h"
#include "llvm/Transforms/HoistPHIConstants.h"
#include "llvm/Transforms/PrintModulePass.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Module.h"
#include "llvm/Method.h"
#include <memory>
#include <string>
#include <fstream>
cl::String InputFilename ("", "Input filename", cl::NoFlags, "-");
cl::String OutputFilename("o", "Output filename", cl::NoFlags, "");
cl::Flag Force ("f", "Overwrite output files");
cl::Flag DumpAsm ("d", "Print bytecode before native code generation",
cl::Hidden);
cl::Flag DoNotEmitAssembly("noasm", "Do not emit assembly code", cl::Hidden);
cl::Flag TraceBBValues ("trace",
"Trace values at basic block and method exits");
cl::Flag TraceMethodValues("tracem", "Trace values only at method exits");
cl::Flag DebugTrace ("debugtrace",
"output trace code as assembly instead of bytecode");
// 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;
}
//===---------------------------------------------------------------------===//
// GenerateCodeForTarget Pass
//
// Native code generation for a specified target.
//===---------------------------------------------------------------------===//
class GenerateCodeForTarget : public Pass {
TargetMachine &Target;
public:
inline GenerateCodeForTarget(TargetMachine &T) : Target(T) {}
// doPerMethodWork - This method does the actual work of generating code for
// the specified method.
//
bool doPerMethodWork(Method *M) {
if (!M->isExternal() && Target.compileMethod(M)) {
cerr << "Error compiling " << InputFilename << "!\n";
return true;
}
return false;
}
};
//===---------------------------------------------------------------------===//
// EmitAssembly Pass
//
// Write assembly code to specified output stream
//===---------------------------------------------------------------------===//
class EmitAssembly : public Pass {
const TargetMachine &Target; // Target to compile for
ostream *Out; // Stream to print on
bool DeleteStream; // Delete stream in dtor?
public:
inline EmitAssembly(const TargetMachine &T, ostream *O, bool D)
: Target(T), Out(O), DeleteStream(D) {}
virtual bool doPassFinalization(Module *M) {
Target.emitAssembly(M, *Out);
if (DeleteStream) delete Out;
return false;
}
};
//===---------------------------------------------------------------------===//
// Function main()
//
// Entry point for the llc compiler.
//===---------------------------------------------------------------------===//
int main(int argc, char **argv) {
int retCode = 0;
cl::ParseCommandLineOptions(argc, argv, " llvm system compiler\n");
// Allocate a target... in the future this will be controllable on the
// command line.
auto_ptr<TargetMachine> target(allocateSparcTargetMachine());
assert(target.get() && "Could not allocate target machine!");
TargetMachine &Target = *target.get();
// Load the module to be compiled...
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...
vector<Pass*> Passes;
// Replace malloc and free instructions with library calls
Passes.push_back(new LowerAllocations(Target.DataLayout));
// Hoist constants out of PHI nodes into predecessor BB's
Passes.push_back(new HoistPHIConstants());
if (TraceBBValues || TraceMethodValues) // If tracing enabled...
{
// Insert trace code in all methods in the module
Passes.push_back(new InsertTraceCode(TraceBBValues,
TraceBBValues ||TraceMethodValues));
// Then write out the module with tracing code before code generation
assert(InputFilename != "-" &&
"files on stdin not supported with tracing");
string traceFileName = GetFileNameRoot(InputFilename)
+ (DebugTrace? ".trace.ll" : ".trace.bc");
ostream *os = new ofstream(traceFileName.c_str(),
(Force ? 0 : ios::noreplace)|ios::out);
if (!os->good()) {
cerr << "Error opening " << traceFileName
<< "! SKIPPING OUTPUT OF TRACE CODE\n";
delete os;
retCode = 1;
} else {
Passes.push_back(new PrintModulePass("", os,
/*deleteStream*/ true,
/*printAsBytecode*/ ! DebugTrace));
}
}
// If LLVM dumping after transformations is requested, add it to the pipeline
if (DumpAsm)
Passes.push_back(new PrintModulePass("Code after xformations: \n",&cerr));
// Generate Target code...
Passes.push_back(new GenerateCodeForTarget(Target));
if (!DoNotEmitAssembly) { // If asm output is enabled...
// Figure out where we are going to send the output...
ostream *Out = 0;
if (OutputFilename != "") { // Specified an output filename?
Out = new ofstream(OutputFilename.c_str(),
(Force ? 0 : ios::noreplace)|ios::out);
} else {
if (InputFilename == "-") {
OutputFilename = "-";
Out = &cout;
} else {
string OutputFilename = GetFileNameRoot(InputFilename);
OutputFilename += ".s";
Out = new ofstream(OutputFilename.c_str(),
(Force ? 0 : ios::noreplace)|ios::out);
if (!Out->good()) {
cerr << "Error opening " << OutputFilename << "!\n";
delete Out;
return 1;
}
}
}
// Output assembly language to the .s file
Passes.push_back(new EmitAssembly(Target, Out, Out != &cout));
}
// Run our queue of passes all at once now, efficiently. This form of
// runAllPasses frees the Pass objects after runAllPasses completes.
Pass::runAllPassesAndFree(M.get(), Passes);
return retCode;
}
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