mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-19 19:29:31 +00:00
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13813 91177308-0d34-0410-b5e6-96231b3b80d8
215 lines
7.6 KiB
C++
215 lines
7.6 KiB
C++
//===-- llc.cpp - Implement the LLVM Native Code Generator ----------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file was developed by the LLVM research group and is distributed under
|
|
// the University of Illinois Open Source License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This is the llc code generator driver. It provides a convenient
|
|
// command-line interface for generating native assembly-language code
|
|
// or C code, given LLVM bytecode.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Bytecode/Reader.h"
|
|
#include "llvm/Target/TargetMachineImpls.h"
|
|
#include "llvm/Target/TargetMachine.h"
|
|
#include "llvm/Transforms/Scalar.h"
|
|
#include "llvm/Module.h"
|
|
#include "llvm/PassManager.h"
|
|
#include "llvm/Pass.h"
|
|
#include "Support/CommandLine.h"
|
|
#include "llvm/System/Signals.h"
|
|
#include <memory>
|
|
#include <fstream>
|
|
|
|
using namespace llvm;
|
|
|
|
// General options for llc. Other pass-specific options are specified
|
|
// within the corresponding llc passes, and target-specific options
|
|
// and back-end code generation options are specified with the target machine.
|
|
//
|
|
static cl::opt<std::string>
|
|
InputFilename(cl::Positional, cl::desc("<input bytecode>"), cl::init("-"));
|
|
|
|
static cl::opt<std::string>
|
|
OutputFilename("o", cl::desc("Output filename"), cl::value_desc("filename"));
|
|
|
|
static cl::opt<bool> Force("f", cl::desc("Overwrite output files"));
|
|
|
|
enum ArchName { noarch, X86, SparcV9, PowerPC, CBackend };
|
|
|
|
static cl::opt<ArchName>
|
|
Arch("march", cl::desc("Architecture to generate assembly for:"), cl::Prefix,
|
|
cl::values(clEnumValN(X86, "x86", " IA-32 (Pentium and above)"),
|
|
clEnumValN(SparcV9, "sparcv9", " SPARC V9"),
|
|
clEnumValN(PowerPC, "powerpc", " PowerPC (experimental)"),
|
|
clEnumValN(CBackend, "c", " C backend"),
|
|
0),
|
|
cl::init(noarch));
|
|
|
|
// GetFileNameRoot - Helper function to get the basename of a filename...
|
|
static inline std::string
|
|
GetFileNameRoot(const std::string &InputFilename)
|
|
{
|
|
std::string IFN = InputFilename;
|
|
std::string outputFilename;
|
|
int Len = IFN.length();
|
|
if ((Len > 2) &&
|
|
IFN[Len-3] == '.' && IFN[Len-2] == 'b' && IFN[Len-1] == 'c') {
|
|
outputFilename = std::string(IFN.begin(), IFN.end()-3); // s/.bc/.s/
|
|
} else {
|
|
outputFilename = IFN;
|
|
}
|
|
return outputFilename;
|
|
}
|
|
|
|
|
|
// main - Entry point for the llc compiler.
|
|
//
|
|
int main(int argc, char **argv) {
|
|
cl::ParseCommandLineOptions(argc, argv, " llvm system compiler\n");
|
|
PrintStackTraceOnErrorSignal();
|
|
|
|
// Load the module to be compiled...
|
|
std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename));
|
|
if (M.get() == 0) {
|
|
std::cerr << argv[0] << ": bytecode didn't read correctly.\n";
|
|
return 1;
|
|
}
|
|
Module &mod = *M.get();
|
|
|
|
// Allocate target machine. First, check whether the user has
|
|
// explicitly specified an architecture to compile for.
|
|
TargetMachine* (*TargetMachineAllocator)(const Module&,
|
|
IntrinsicLowering *) = 0;
|
|
switch (Arch) {
|
|
case CBackend:
|
|
TargetMachineAllocator = allocateCTargetMachine;
|
|
break;
|
|
case X86:
|
|
TargetMachineAllocator = allocateX86TargetMachine;
|
|
break;
|
|
case SparcV9:
|
|
TargetMachineAllocator = allocateSparcV9TargetMachine;
|
|
break;
|
|
case PowerPC:
|
|
TargetMachineAllocator = allocatePowerPCTargetMachine;
|
|
break;
|
|
default:
|
|
// Decide what the default target machine should be, by looking at
|
|
// the module. This heuristic (ILP32, LE -> IA32; LP64, BE ->
|
|
// SPARCV9) is kind of gross, but it will work until we have more
|
|
// sophisticated target information to work from.
|
|
if (mod.getEndianness() == Module::LittleEndian &&
|
|
mod.getPointerSize() == Module::Pointer32) {
|
|
TargetMachineAllocator = allocateX86TargetMachine;
|
|
} else if (mod.getEndianness() == Module::BigEndian &&
|
|
mod.getPointerSize() == Module::Pointer32) {
|
|
TargetMachineAllocator = allocatePowerPCTargetMachine;
|
|
} else if (mod.getEndianness() == Module::BigEndian &&
|
|
mod.getPointerSize() == Module::Pointer64) {
|
|
TargetMachineAllocator = allocateSparcV9TargetMachine;
|
|
} else {
|
|
// If the module is target independent, favor a target which matches the
|
|
// current build system.
|
|
#if defined(i386) || defined(__i386__) || defined(__x86__)
|
|
TargetMachineAllocator = allocateX86TargetMachine;
|
|
#elif defined(sparc) || defined(__sparc__) || defined(__sparcv9)
|
|
TargetMachineAllocator = allocateSparcV9TargetMachine;
|
|
#elif defined(__POWERPC__) || defined(__ppc__) || defined(__APPLE__)
|
|
TargetMachineAllocator = allocatePowerPCTargetMachine;
|
|
#else
|
|
std::cerr << argv[0] << ": module does not specify a target to use. "
|
|
<< "You must use the -march option. If no native target is "
|
|
<< "available, use -march=c to emit C code.\n";
|
|
return 1;
|
|
#endif
|
|
}
|
|
break;
|
|
}
|
|
std::auto_ptr<TargetMachine> target(TargetMachineAllocator(mod, 0));
|
|
assert(target.get() && "Could not allocate target machine!");
|
|
TargetMachine &Target = *target.get();
|
|
const TargetData &TD = Target.getTargetData();
|
|
|
|
// Build up all of the passes that we want to do to the module...
|
|
PassManager Passes;
|
|
|
|
Passes.add(new TargetData("llc", TD.isLittleEndian(), TD.getPointerSize(),
|
|
TD.getPointerAlignment(), TD.getDoubleAlignment()));
|
|
|
|
// Figure out where we are going to send the output...
|
|
std::ostream *Out = 0;
|
|
if (OutputFilename != "") {
|
|
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!
|
|
std::cerr << argv[0] << ": error opening '" << OutputFilename
|
|
<< "': file exists!\n"
|
|
<< "Use -f command line argument to force output\n";
|
|
return 1;
|
|
}
|
|
Out = new std::ofstream(OutputFilename.c_str());
|
|
|
|
// Make sure that the Out file gets unlinked from the disk if we get a
|
|
// SIGINT
|
|
RemoveFileOnSignal(OutputFilename);
|
|
} else {
|
|
Out = &std::cout;
|
|
}
|
|
} else {
|
|
if (InputFilename == "-") {
|
|
OutputFilename = "-";
|
|
Out = &std::cout;
|
|
} else {
|
|
OutputFilename = GetFileNameRoot(InputFilename);
|
|
|
|
if (Arch != CBackend)
|
|
OutputFilename += ".s";
|
|
else
|
|
OutputFilename += ".cbe.c";
|
|
|
|
if (!Force && std::ifstream(OutputFilename.c_str())) {
|
|
// If force is not specified, make sure not to overwrite a file!
|
|
std::cerr << argv[0] << ": 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()) {
|
|
std::cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
|
|
delete Out;
|
|
return 1;
|
|
}
|
|
|
|
// Make sure that the Out file gets unlinked from the disk if we get a
|
|
// SIGINT
|
|
RemoveFileOnSignal(OutputFilename);
|
|
}
|
|
}
|
|
|
|
// Ask the target to add backend passes as necessary
|
|
if (Target.addPassesToEmitAssembly(Passes, *Out)) {
|
|
std::cerr << argv[0] << ": target '" << Target.getName()
|
|
<< "' does not support static compilation!\n";
|
|
if (Out != &std::cout) delete Out;
|
|
// And the Out file is empty and useless, so remove it now.
|
|
std::remove(OutputFilename.c_str());
|
|
return 1;
|
|
} else {
|
|
// Run our queue of passes all at once now, efficiently.
|
|
Passes.run(*M.get());
|
|
}
|
|
|
|
// Delete the ostream if it's not a stdout stream
|
|
if (Out != &std::cout) delete Out;
|
|
|
|
return 0;
|
|
}
|