-//===-- 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/ChangeAllocations.h"
#include "llvm/Transforms/Scalar.h"
-#include "llvm/Transforms/Utils/Linker.h"
-#include "llvm/Assembly/PrintModulePass.h"
-#include "llvm/Bytecode/WriteBytecodePass.h"
-#include "llvm/Transforms/ConstantMerge.h"
#include "llvm/Module.h"
-#include "llvm/Function.h"
#include "llvm/PassManager.h"
+#include "llvm/Pass.h"
#include "Support/CommandLine.h"
#include "Support/Signals.h"
#include <memory>
#include <fstream>
-using std::string;
-static cl::String InputFilename ("", "Input filename", cl::NoFlags, "-");
-static cl::String OutputFilename("o", "Output filename", cl::NoFlags, "");
-static cl::Flag Force ("f", "Overwrite output files");
-static cl::Flag DumpAsm ("d", "Print bytecode before native code generation", cl::Hidden);
-static cl::String TraceLibPath ("tracelibpath", "Path to libinstr for trace code", cl::Hidden, "");
+using namespace llvm;
-enum TraceLevel {
- TraceOff, TraceFunctions, TraceBasicBlocks
-};
+// 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::Enum<enum TraceLevel> TraceValues("trace", cl::NoFlags,
- "Trace values through functions or basic blocks",
- clEnumValN(TraceOff , "off", "Disable trace code"),
- clEnumValN(TraceFunctions , "function", "Trace each function"),
- clEnumValN(TraceBasicBlocks, "basicblock", "Trace each basic block"), 0);
+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;
}
return outputFilename;
}
-static void insertTraceCodeFor(Module *M) {
- PassManager Passes;
-
- // Insert trace code in all functions in the module
- switch (TraceValues) {
- case TraceBasicBlocks:
- Passes.add(createTraceValuesPassForBasicBlocks());
- break;
- case TraceFunctions:
- Passes.add(createTraceValuesPassForFunction());
- break;
- default:
- assert(0 && "Bad value for TraceValues!");
- abort();
- }
-
- // Eliminate duplication in constant pool
- Passes.add(createDynamicConstantMergePass());
-
- // Run passes to insert and clean up trace code...
- Passes.run(M);
-
- std::string ErrorMessage;
-
- // Load the module that contains the runtime helper routines neccesary for
- // pointer hashing and stuff... link this module into the program if possible
- //
- Module *TraceModule = ParseBytecodeFile(TraceLibPath+"libinstr.bc");
-
- // Ok, the TraceLibPath didn't contain a valid module. Try to load the module
- // from the current LLVM-GCC install directory. This is kindof a hack, but
- // allows people to not HAVE to have built the library.
- //
- if (TraceModule == 0)
- TraceModule = ParseBytecodeFile("/home/vadve/lattner/cvs/gcc_install/lib/"
- "gcc-lib/llvm/3.1/libinstr.bc");
-
- // If we still didn't get it, cancel trying to link it in...
- if (TraceModule == 0) {
- cerr << "Warning, could not load trace routines to link into program!\n";
- } else {
-
- // Link in the trace routines... if the link fails, don't panic, because the
- // compile should still succeed, just the native linker will probably fail.
- //
- std::auto_ptr<Module> TraceRoutines(TraceModule);
- if (LinkModules(M, TraceRoutines.get(), &ErrorMessage))
- cerr << "Warning: Error linking in trace routines: "
- << ErrorMessage << "\n";
- }
-
-
- // Write out the module with tracing code just before code generation
- if (InputFilename != "-") {
- string TraceFilename = GetFileNameRoot(InputFilename) + ".trace.bc";
-
- std::ofstream Out(TraceFilename.c_str());
- if (!Out.good()) {
- cerr << "Error opening '" << TraceFilename
- << "'!: Skipping output of trace code as bytecode\n";
- } else {
- cerr << "Emitting trace code to '" << TraceFilename
- << "' for comparison...\n";
- WriteBytecodeToFile(M, Out);
- }
- }
-
-}
-
-
-//===---------------------------------------------------------------------===//
-// Function main()
-//
-// Entry point for the llc compiler.
-//===---------------------------------------------------------------------===//
+// main - Entry point for the llc compiler.
+//
int main(int argc, char **argv) {
cl::ParseCommandLineOptions(argc, argv, " llvm system compiler\n");
- // Allocate a target... in the future this will be controllable on the
- // command line.
- std::auto_ptr<TargetMachine> target(allocateSparcTargetMachine());
- assert(target.get() && "Could not allocate target machine!");
-
- TargetMachine &Target = *target.get();
-
// Load the module to be compiled...
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;
}
-
- if (TraceValues != TraceOff) // If tracing enabled...
- insertTraceCodeFor(M.get()); // Hack up module before using passmanager...
+ 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...
PassManager Passes;
- // Decompose multi-dimensional refs into a sequence of 1D refs
- Passes.add(createDecomposeMultiDimRefsPass());
-
- // 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.add(createLowerAllocationsPass(Target.DataLayout));
-
- // If LLVM dumping after transformations is requested, add it to the pipeline
- if (DumpAsm)
- Passes.add(new PrintFunctionPass("Code after xformations: \n", &cerr));
+ 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 != "") { // Specified an output filename?
- if (!Force && std::ifstream(OutputFilename.c_str())) {
- // If force is not specified, make sure not to overwrite a file!
- cerr << "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 (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 unlink'd from the disk if we get a
- // SIGINT
- RemoveFileOnSignal(OutputFilename);
+ // 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 {
- string OutputFilename = GetFileNameRoot(InputFilename);
- OutputFilename += ".s";
+ 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!
- cerr << "Error opening '" << OutputFilename << "': File exists!\n"
- << "Use -f command line argument to force output\n";
+ 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()) {
- cerr << "Error opening " << OutputFilename << "!\n";
+ std::cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
delete Out;
return 1;
}
- // Make sure that the Out file gets unlink'd from the disk if we get a
+
+ // Make sure that the Out file gets unlinked from the disk if we get a
// SIGINT
RemoveFileOnSignal(OutputFilename);
}
}
-
- Target.addPassesToEmitAssembly(Passes, *Out);
-
- // 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";
+ 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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