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b5881f126d
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5934 91177308-0d34-0410-b5e6-96231b3b80d8
300 lines
10 KiB
C++
300 lines
10 KiB
C++
//===-- llc.cpp - Implement the LLVM Compiler -----------------------------===//
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//
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// This is the llc compiler driver.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Bytecode/Reader.h"
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#include "llvm/Target/TargetMachineImpls.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Transforms/Instrumentation.h"
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#include "llvm/Transforms/Scalar.h"
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#include "llvm/Transforms/Utils/Linker.h"
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#include "llvm/Assembly/PrintModulePass.h"
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#include "llvm/Bytecode/WriteBytecodePass.h"
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#include "llvm/Transforms/IPO.h"
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#include "llvm/Module.h"
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#include "llvm/PassManager.h"
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#include "llvm/Pass.h"
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#include "llvm/Support/PassNameParser.h"
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#include "Support/CommandLine.h"
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#include "Support/Signals.h"
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#include <memory>
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#include <fstream>
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//------------------------------------------------------------------------------
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// Option declarations for LLC.
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//------------------------------------------------------------------------------
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// Make all registered optimization passes available to llc. These passes
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// will all be run before the simplification and lowering steps used by the
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// back-end code generator, and will be run in the order specified on the
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// command line. The OptimizationList is automatically populated with
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// registered Passes by the PassNameParser.
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//
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static cl::list<const PassInfo*, bool,
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FilteredPassNameParser<PassInfo::Optimization> >
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OptimizationList(cl::desc("Optimizations available:"));
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// General options for llc. Other pass-specific options are specified
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// within the corresponding llc passes, and target-specific options
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// and back-end code generation options are specified with the target machine.
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//
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static cl::opt<std::string>
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InputFilename(cl::Positional, cl::desc("<input bytecode>"), cl::init("-"));
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static cl::opt<std::string>
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OutputFilename("o", cl::desc("Output filename"), cl::value_desc("filename"));
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static cl::opt<bool> Force("f", cl::desc("Overwrite output files"));
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static cl::opt<bool>
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DumpAsm("d", cl::desc("Print bytecode before native code generation"),
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cl::Hidden);
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static cl::opt<std::string>
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TraceLibPath("tracelibpath", cl::desc("Path to libinstr for trace code"),
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cl::value_desc("directory"), cl::Hidden);
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// flags set from -tracem and -trace options to control tracing
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static bool TraceFunctions = false;
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static bool TraceBasicBlocks = false;
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// GetFileNameRoot - Helper function to get the basename of a filename...
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static inline std::string
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GetFileNameRoot(const std::string &InputFilename)
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{
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std::string IFN = InputFilename;
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std::string outputFilename;
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int Len = IFN.length();
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if (IFN[Len-3] == '.' && IFN[Len-2] == 'b' && IFN[Len-1] == 'c') {
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outputFilename = std::string(IFN.begin(), IFN.end()-3); // s/.bc/.s/
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} else {
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outputFilename = IFN;
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}
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return outputFilename;
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}
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static bool
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insertTraceCodeFor(Module &M)
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{
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PassManager Passes;
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// Insert trace code in all functions in the module
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if (TraceBasicBlocks)
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Passes.add(createTraceValuesPassForBasicBlocks());
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else if (TraceFunctions)
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Passes.add(createTraceValuesPassForFunction());
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else
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return false;
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// Eliminate duplication in constant pool
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Passes.add(createConstantMergePass());
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// Run passes to insert and clean up trace code...
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Passes.run(M);
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std::string ErrorMessage;
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// Load the module that contains the runtime helper routines neccesary for
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// pointer hashing and stuff... link this module into the program if possible
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//
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Module *TraceModule = ParseBytecodeFile(TraceLibPath+"libinstr.bc");
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// Check if the TraceLibPath contains a valid module. If not, try to load
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// the module from the current LLVM-GCC install directory. This is kindof
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// a hack, but allows people to not HAVE to have built the library.
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//
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if (TraceModule == 0)
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TraceModule = ParseBytecodeFile("/home/vadve/lattner/cvs/gcc_install/lib/"
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"gcc-lib/llvm/3.1/libinstr.bc");
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// If we still didn't get it, cancel trying to link it in...
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if (TraceModule == 0)
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std::cerr <<"WARNING: couldn't load trace routines to link into program!\n";
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else
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{
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// Link in the trace routines... if this fails, don't panic, because the
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// compile should still succeed, but the native linker will probably fail.
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//
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std::auto_ptr<Module> TraceRoutines(TraceModule);
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if (LinkModules(&M, TraceRoutines.get(), &ErrorMessage))
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std::cerr << "WARNING: Error linking in trace routines: "
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<< ErrorMessage << "\n";
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}
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// Write out the module with tracing code just before code generation
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assert (InputFilename != "-"
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&& "Cannot write out traced bytecode when reading input from stdin");
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std::string TraceFilename = GetFileNameRoot(InputFilename) + ".trace.bc";
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std::ofstream Out(TraceFilename.c_str());
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if (!Out.good())
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std::cerr << "Error opening '" << TraceFilename
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<< "'!: Skipping output of trace code as bytecode\n";
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else
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{
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std::cerr << "Emitting trace code to '" << TraceFilename
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<< "' for comparison...\n";
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WriteBytecodeToFile(&M, Out);
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}
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return true;
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}
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// Making tracing a module pass so the entire module with tracing
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// can be written out before continuing.
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struct InsertTracingCodePass: public Pass {
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virtual bool run(Module &M) {
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return insertTraceCodeFor(M);
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}
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};
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//===---------------------------------------------------------------------===//
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// Function main()
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//
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// Entry point for the llc compiler.
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//===---------------------------------------------------------------------===//
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int
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main(int argc, char **argv)
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{
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cl::ParseCommandLineOptions(argc, argv, " llvm system compiler\n");
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// Allocate a target... in the future this will be controllable on the
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// command line.
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std::auto_ptr<TargetMachine> target(allocateSparcTargetMachine());
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assert(target.get() && "Could not allocate target machine!");
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TargetMachine &Target = *target.get();
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const TargetData &TD = Target.getTargetData();
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// Load the module to be compiled...
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std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename));
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if (M.get() == 0)
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{
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std::cerr << argv[0] << ": bytecode didn't read correctly.\n";
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return 1;
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}
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// Build up all of the passes that we want to do to the module...
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PassManager Passes;
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Passes.add(new TargetData("llc", TD.isLittleEndian(), TD.getSubWordDataSize(),
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TD.getIntegerRegSize(), TD.getPointerSize(),
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TD.getPointerAlignment()));
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// Create a new optimization pass for each one specified on the command line
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// Deal specially with tracing passes, which must be run differently than opt.
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//
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for (unsigned i = 0; i < OptimizationList.size(); ++i)
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{
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const PassInfo *Opt = OptimizationList[i];
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if (std::string(Opt->getPassArgument()) == "trace")
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TraceFunctions = !(TraceBasicBlocks = true);
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else if (std::string(Opt->getPassArgument()) == "tracem")
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TraceFunctions = !(TraceBasicBlocks = false);
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else
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{ // handle other passes as normal optimization passes
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if (Opt->getNormalCtor())
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Passes.add(Opt->getNormalCtor()());
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else if (Opt->getTargetCtor())
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Passes.add(Opt->getTargetCtor()(Target));
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else
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std::cerr << argv[0] << ": cannot create pass: "
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<< Opt->getPassName() << "\n";
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}
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}
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// Run tracing passes after other optimization passes and before llc passes.
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if (TraceFunctions || TraceBasicBlocks)
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Passes.add(new InsertTracingCodePass);
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// Decompose multi-dimensional refs into a sequence of 1D refs
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Passes.add(createDecomposeMultiDimRefsPass());
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// Replace malloc and free instructions with library calls.
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// Do this after tracing until lli implements these lib calls.
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// For now, it will emulate malloc and free internally.
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Passes.add(createLowerAllocationsPass());
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// If LLVM dumping after transformations is requested, add it to the pipeline
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if (DumpAsm)
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Passes.add(new PrintFunctionPass("Code after xformations: \n", &std::cerr));
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// Strip all of the symbols from the bytecode so that it will be smaller...
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Passes.add(createSymbolStrippingPass());
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// Figure out where we are going to send the output...
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std::ostream *Out = 0;
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if (OutputFilename != "")
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{ // Specified an output filename?
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if (!Force && std::ifstream(OutputFilename.c_str())) {
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// If force is not specified, make sure not to overwrite a file!
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std::cerr << argv[0] << ": error opening '" << OutputFilename
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<< "': file exists!\n"
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<< "Use -f command line argument to force output\n";
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return 1;
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}
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Out = new std::ofstream(OutputFilename.c_str());
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// Make sure that the Out file gets unlink'd from the disk if we get a
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// SIGINT
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RemoveFileOnSignal(OutputFilename);
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}
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else
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{
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if (InputFilename == "-")
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{
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OutputFilename = "-";
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Out = &std::cout;
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}
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else
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{
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std::string OutputFilename = GetFileNameRoot(InputFilename);
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OutputFilename += ".s";
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if (!Force && std::ifstream(OutputFilename.c_str()))
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{
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// If force is not specified, make sure not to overwrite a file!
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std::cerr << argv[0] << ": error opening '" << OutputFilename
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<< "': file exists!\n"
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<< "Use -f command line argument to force output\n";
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return 1;
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}
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Out = new std::ofstream(OutputFilename.c_str());
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if (!Out->good())
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{
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std::cerr << argv[0] << ": error opening " << OutputFilename
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<< "!\n";
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delete Out;
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return 1;
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}
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// Make sure that the Out file gets unlink'd from the disk if we get a
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// SIGINT
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RemoveFileOnSignal(OutputFilename);
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}
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}
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// Ask the target to add backend passes as neccesary
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if (Target.addPassesToEmitAssembly(Passes, *Out)) {
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std::cerr << argv[0] << ": target '" << Target.getName()
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<< " does not support static compilation!\n";
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} else {
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// Run our queue of passes all at once now, efficiently.
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Passes.run(*M.get());
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}
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// Delete the ostream if it's not a stdout stream
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if (Out != &std::cout) delete Out;
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return 0;
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}
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