-//===-- llc.cpp - Implement the LLVM Compiler -----------------------------===//
+//===-- 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 compiler driver.
+// This is the llc code generator.
//
//===----------------------------------------------------------------------===//
#include "llvm/Bytecode/Reader.h"
-#include "llvm/Target/Sparc.h"
+#include "llvm/Target/TargetMachineImpls.h"
#include "llvm/Target/TargetMachine.h"
-#include "llvm/Transforms/Instrumentation/TraceValues.h"
-#include "llvm/Transforms/LowerAllocations.h"
-#include "llvm/Transforms/HoistPHIConstants.h"
-#include "llvm/Assembly/PrintModulePass.h"
-#include "llvm/Bytecode/WriteBytecodePass.h"
-#include "llvm/Transforms/ConstantMerge.h"
-#include "llvm/Support/CommandLine.h"
+#include "llvm/Transforms/Scalar.h"
#include "llvm/Module.h"
-#include "llvm/Method.h"
+#include "llvm/PassManager.h"
+#include "llvm/Pass.h"
+#include "Support/CommandLine.h"
+#include "Support/Signals.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");
+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, 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));
// GetFileNameRoot - Helper function to get the basename of a filename...
-static inline string GetFileNameRoot(const string &InputFilename) {
- string IFN = InputFilename;
- string outputFilename;
+static inline std::string
+GetFileNameRoot(const std::string &InputFilename)
+{
+ std::string IFN = InputFilename;
+ std::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/
+ 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;
}
}
-//===---------------------------------------------------------------------===//
-// 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.
-//===---------------------------------------------------------------------===//
-
+// 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));
+ std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename));
if (M.get() == 0) {
- cerr << "bytecode didn't read correctly.\n";
+ 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";
+ 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...
- vector<Pass*> Passes;
-
- // 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));
+ 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());
- // Eliminate duplication in constant pool
- Passes.push_back(new DynamicConstantMerge());
-
- // Then write out the module with tracing code before code generation
- assert(InputFilename != "-" &&
- "files on stdin not supported with tracing");
- string traceFileName = GetFileNameRoot(InputFilename) + ".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;
- return 1;
+ // Make sure that the Out file gets unlinked from the disk if we get a
+ // SIGINT
+ RemoveFileOnSignal(OutputFilename);
+ } else {
+ Out = &std::cout;
}
-
- Passes.push_back(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.push_back(new LowerAllocations(Target.DataLayout));
-
- // 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 = &std::cout;
} else {
- if (InputFilename == "-") {
- OutputFilename = "-";
- Out = &cout;
- } else {
- string OutputFilename = GetFileNameRoot(InputFilename);
+ OutputFilename = GetFileNameRoot(InputFilename);
+
+ if (Arch != CBackend)
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;
- }
+ 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);
}
-
- // 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;
-}
+ // 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;
+}
projects / oota-llvm.git / blobdiff