//===-- 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.
+// 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/Target/TargetMachineRegistry.h"
#include "llvm/Transforms/Scalar.h"
#include "llvm/Module.h"
#include "llvm/PassManager.h"
#include "llvm/Pass.h"
-#include "Support/CommandLine.h"
-#include "Support/Signals.h"
-#include <memory>
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/PluginLoader.h"
+#include "llvm/System/Signals.h"
#include <fstream>
+#include <iostream>
+#include <memory>
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<bool> Force("f", cl::desc("Overwrite output files"));
-enum ArchName { noarch, X86, Sparc, 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(Sparc, "sparc", " SPARC V9"),
- clEnumValN(PowerPC, "powerpc", " PowerPC"),
- clEnumValN(CBackend, "c", " C backend"),
- 0),
- cl::init(noarch));
+static cl::opt<const TargetMachineRegistry::Entry*, false, TargetNameParser>
+MArch("march", cl::desc("Architecture to generate assembly for:"));
// GetFileNameRoot - Helper function to get the basename of a filename...
static inline std::string
-GetFileNameRoot(const std::string &InputFilename)
-{
+GetFileNameRoot(const std::string &InputFilename) {
std::string IFN = InputFilename;
std::string outputFilename;
int Len = IFN.length();
// main - Entry point for the llc compiler.
//
int main(int argc, char **argv) {
- cl::ParseCommandLineOptions(argc, argv, " llvm system compiler\n");
-
- // 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 Sparc:
- TargetMachineAllocator = allocateSparcTargetMachine;
- 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 = allocateSparcTargetMachine;
- } 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 = allocateSparcTargetMachine;
-#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";
+ try {
+ cl::ParseCommandLineOptions(argc, argv, " llvm system compiler\n");
+ sys::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;
-#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;
+ }
+ 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;
+ if (MArch == 0) {
+ std::string Err;
+ MArch = TargetMachineRegistry::getClosestStaticTargetForModule(mod, Err);
+ if (MArch == 0) {
+ std::cerr << argv[0] << ": error auto-selecting target for module '"
+ << Err << "'. Please use the -march option to explicitly "
+ << "pick a target.\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);
+ std::auto_ptr<TargetMachine> target(MArch->CtorFn(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
+ sys::RemoveFileOnSignal(sys::Path(OutputFilename));
+ } else {
+ Out = &std::cout;
+ }
} else {
- Out = &std::cout;
+ if (InputFilename == "-") {
+ OutputFilename = "-";
+ Out = &std::cout;
+ } else {
+ OutputFilename = GetFileNameRoot(InputFilename);
+
+ if (MArch->Name[0] != 'c' || MArch->Name[1] != 0) // not CBE
+ 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
+ sys::RemoveFileOnSignal(sys::Path(OutputFilename));
+ }
}
- } else {
- if (InputFilename == "-") {
- OutputFilename = "-";
- Out = &std::cout;
+
+ // 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 {
- 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);
+ // Run our queue of passes all at once now, efficiently.
+ Passes.run(*M.get());
}
- }
- // 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";
+ // Delete the ostream if it's not a stdout stream
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;
+ return 0;
+ } catch (const std::string& msg) {
+ std::cerr << argv[0] << ": " << msg << "\n";
+ } catch (...) {
+ std::cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
+ }
+ return 1;
}