-// $Id$
-//***************************************************************************
-// File:
-// llc.cpp
+//===-- llc.cpp - Implement the LLVM Native Code Generator ----------------===//
//
-// Purpose:
-// Driver for llc compiler.
+// 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.
//
-// History:
-// 7/15/01 - Vikram Adve - Created
-//
-//**************************************************************************/
-
-//************************** System Include Files **************************/
-
-//*************************** User Include Files ***************************/
+//===----------------------------------------------------------------------===//
+//
+// This is the llc code generator.
+//
+//===----------------------------------------------------------------------===//
-#include "llvm/Module.h"
-#include "llvm/Method.h"
#include "llvm/Bytecode/Reader.h"
-#include "llvm/Bytecode/Writer.h"
-#include "llvm/Codegen/InstrForest.h"
-#include "llvm/Codegen/InstrSelection.h"
-#include "llvm/LLC/LLCOptions.h"
-#include "llvm/LLC/CompileContext.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 "Support/Signals.h"
+#include <memory>
+#include <fstream>
-//************************** Forward Declarations **************************/
+using namespace llvm;
-class Module;
-class CompileContext;
+// 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 bool CompileModule (Module *module,
- CompileContext& compileContext);
+static cl::opt<bool> Force("f", cl::desc("Overwrite output files"));
-int DebugInstrSelectLevel = DEBUG_INSTR_TREES;
+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));
-//---------------------------------------------------------------------------
-// Function main()
-//
-// Entry point for the driver.
-//---------------------------------------------------------------------------
+// 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;
+}
-int
-main(int argc, const char** argv, const char** envp)
-{
- CompileContext compileContext(argc, argv, envp);
-
- Module *module =
- ParseBytecodeFile(compileContext.getOptions().getInputFileName());
+// main - Entry point for the llc compiler.
+//
+int main(int argc, char **argv) {
+ cl::ParseCommandLineOptions(argc, argv, " llvm system compiler\n");
- if (module == 0) {
- cerr << "bytecode didn't read correctly.\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;
}
-
- bool failure = CompileModule(module, compileContext);
-
- if (failure)
- {
- cerr << "Error compiling "
- << compileContext.getOptions().getInputFileName() << "!\n";
- delete module;
+ 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";
return 1;
- }
-
- // Okay, we're done now... write out result...
- // WriteBytecodeToFile(module,
- // compileContext.getOptions().getOutputFileName);
-
- // Clean up and exit
- delete module;
- return 0;
-}
+#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;
-static bool
-CompileModule(Module *module,
- CompileContext& ccontext)
-{
- bool failed = false;
-
- for (Module::MethodListType::const_iterator
- methodIter = module->getMethodList().begin();
- methodIter != module->getMethodList().end();
- ++methodIter)
- {
- Method* method = *methodIter;
+ 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;
+ }
- if (SelectInstructionsForMethod(method, ccontext))
- {
- failed = true;
- cerr << "Instruction selection failed for method "
- << (method->hasName()? method->getName() : "")
- << endl << endl;
- }
+ // Make sure that the Out file gets unlinked from the disk if we get a
+ // SIGINT
+ RemoveFileOnSignal(OutputFilename);
}
-
- return failed;
-}
+ }
+ // 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;
+}
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