-//===-- llc.cpp - Implement the LLVM Compiler -----------------------------===//
+//===-- llc.cpp - Implement the LLVM Native Code Generator ----------------===//
+//
+// The LLVM Compiler Infrastructure
//
-// This is the llc compiler driver.
+// 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.
//
//===----------------------------------------------------------------------===//
#include "llvm/Bytecode/Reader.h"
#include "llvm/Target/TargetMachineImpls.h"
#include "llvm/Target/TargetMachine.h"
-#include "llvm/Transforms/Instrumentation.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/IPO.h"
#include "llvm/Module.h"
#include "llvm/PassManager.h"
#include "llvm/Pass.h"
-#include "llvm/Support/PassNameParser.h"
#include "Support/CommandLine.h"
#include "Support/Signals.h"
#include <memory>
#include <fstream>
-//------------------------------------------------------------------------------
-// Option declarations for LLC.
-//------------------------------------------------------------------------------
-
-// Make all registered optimization passes available to llc. These passes
-// will all be run before the simplification and lowering steps used by the
-// back-end code generator, and will be run in the order specified on the
-// command line. The OptimizationList is automatically populated with
-// registered Passes by the PassNameParser.
-//
-static cl::list<const PassInfo*, bool,
- FilteredPassNameParser<PassInfo::Optimization> >
-OptimizationList(cl::desc("Optimizations available:"));
-
+using namespace llvm;
// General options for llc. Other pass-specific options are specified
// within the corresponding llc passes, and target-specific options
static cl::opt<bool> Force("f", cl::desc("Overwrite output files"));
-static cl::opt<bool>
-DisableStrip("disable-strip",
- cl::desc("Do not strip the LLVM bytecode included in the executable"));
-
-static cl::opt<bool>
-DumpAsm("d", cl::desc("Print bytecode before native code generation"),
- cl::Hidden);
-
-static cl::opt<std::string>
-TraceLibPath("tracelibpath", cl::desc("Path to libinstr for trace code"),
- cl::value_desc("directory"), cl::Hidden);
-
-
-// flags set from -tracem and -trace options to control tracing
-static bool TraceFunctions = false;
-static bool TraceBasicBlocks = false;
+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 std::string
std::string IFN = InputFilename;
std::string outputFilename;
int Len = IFN.length();
- if (IFN[Len-3] == '.' && IFN[Len-2] == 'b' && IFN[Len-1] == 'c') {
+ 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 bool
-insertTraceCodeFor(Module &M)
-{
- PassManager Passes;
-
- // Insert trace code in all functions in the module
- if (TraceBasicBlocks)
- Passes.add(createTraceValuesPassForBasicBlocks());
- else if (TraceFunctions)
- Passes.add(createTraceValuesPassForFunction());
- else
- return false;
-
- // Eliminate duplication in constant pool
- Passes.add(createConstantMergePass());
-
- // 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");
-
- // Check if the TraceLibPath contains a valid module. If not, 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)
- std::cerr <<"WARNING: couldn't load trace routines to link into program!\n";
- else
- {
- // Link in the trace routines... if this fails, don't panic, because the
- // compile should still succeed, but the native linker will probably fail.
- //
- std::auto_ptr<Module> TraceRoutines(TraceModule);
- if (LinkModules(&M, TraceRoutines.get(), &ErrorMessage))
- std::cerr << "WARNING: Error linking in trace routines: "
- << ErrorMessage << "\n";
- }
-
- // Write out the module with tracing code just before code generation
- assert (InputFilename != "-"
- && "Cannot write out traced bytecode when reading input from stdin");
- std::string TraceFilename = GetFileNameRoot(InputFilename) + ".trace.bc";
-
- std::ofstream Out(TraceFilename.c_str());
- if (!Out.good())
- std::cerr << "Error opening '" << TraceFilename
- << "'!: Skipping output of trace code as bytecode\n";
- else
- {
- std::cerr << "Emitting trace code to '" << TraceFilename
- << "' for comparison...\n";
- WriteBytecodeToFile(&M, Out);
- }
-
- return true;
-}
-
-// Making tracing a module pass so the entire module with tracing
-// can be written out before continuing.
-struct InsertTracingCodePass: public Pass {
- virtual bool run(Module &M) {
- return insertTraceCodeFor(M);
- }
-};
-
-//===---------------------------------------------------------------------===//
-// Function main()
-//
-// Entry point for the llc compiler.
-//===---------------------------------------------------------------------===//
-
-int
-main(int argc, char **argv)
-{
+// 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();
- const TargetData &TD = Target.getTargetData();
-
// 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";
+ 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";
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()));
- // Create a new optimization pass for each one specified on the command line
- // Deal specially with tracing passes, which must be run differently than opt.
- //
- for (unsigned i = 0; i < OptimizationList.size(); ++i)
- {
- const PassInfo *Opt = OptimizationList[i];
-
- if (std::string(Opt->getPassArgument()) == "trace")
- TraceFunctions = !(TraceBasicBlocks = true);
- else if (std::string(Opt->getPassArgument()) == "tracem")
- TraceFunctions = !(TraceBasicBlocks = false);
- else
- { // handle other passes as normal optimization passes
- if (Opt->getNormalCtor())
- Passes.add(Opt->getNormalCtor()());
- else if (Opt->getTargetCtor())
- Passes.add(Opt->getTargetCtor()(Target));
- else
- std::cerr << argv[0] << ": cannot create pass: "
- << Opt->getPassName() << "\n";
- }
- }
-
- // Run tracing passes after other optimization passes and before llc passes.
- if (TraceFunctions || TraceBasicBlocks)
- Passes.add(new InsertTracingCodePass);
-
- // 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());
-
- // If LLVM dumping after transformations is requested, add it to the pipeline
- if (DumpAsm)
- Passes.add(new PrintFunctionPass("Code after xformations: \n", &std::cerr));
-
- // Strip all of the symbols from the bytecode so that it will be smaller...
- if (!DisableStrip)
- Passes.add(createSymbolStrippingPass());
-
// Figure out where we are going to send the output...
std::ostream *Out = 0;
- if (OutputFilename != "")
- { // Specified an output filename?
+ 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
<< "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
+ 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);
}
- else
- {
- if (InputFilename == "-")
- {
- OutputFilename = "-";
- Out = &std::cout;
- }
- else
- {
- std::string OutputFilename = GetFileNameRoot(InputFilename);
- OutputFilename += ".s";
-
- 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 unlink'd from the disk if we get a
- // SIGINT
- RemoveFileOnSignal(OutputFilename);
- }
- }
+ }
- // Ask the target to add backend passes as neccesary
+ // 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";
+ << "' 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());
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