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212 lines
8.1 KiB
C++
212 lines
8.1 KiB
C++
//===-- gccas.cpp - The "optimizing assembler" used by the GCC frontend ---===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This utility is designed to be used by the GCC frontend for creating bytecode
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// files from its intermediate LLVM assembly. The requirements for this utility
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// are thus slightly different than that of the standard `as' util.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Module.h"
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#include "llvm/PassManager.h"
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#include "llvm/Analysis/LoadValueNumbering.h"
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#include "llvm/Analysis/Verifier.h"
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#include "llvm/Assembly/Parser.h"
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#include "llvm/Bytecode/WriteBytecodePass.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Transforms/IPO.h"
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#include "llvm/Transforms/Scalar.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/System/Signals.h"
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#include <memory>
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#include <fstream>
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using namespace llvm;
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namespace {
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cl::opt<std::string>
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InputFilename(cl::Positional,cl::desc("<input llvm assembly>"),cl::init("-"));
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cl::opt<std::string>
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OutputFilename("o", cl::desc("Override output filename"),
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cl::value_desc("filename"));
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cl::opt<bool>
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Verify("verify", cl::desc("Verify each pass result"));
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cl::opt<bool>
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DisableInline("disable-inlining", cl::desc("Do not run the inliner pass"));
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cl::opt<bool>
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DisableOptimizations("disable-opt",
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cl::desc("Do not run any optimization passes"));
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cl::opt<bool>
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StripDebug("strip-debug",
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cl::desc("Strip debugger symbol info from translation unit"));
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cl::opt<bool>
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NoCompress("disable-compression", cl::init(false),
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cl::desc("Don't compress the generated bytecode"));
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cl::opt<bool> TF("traditional-format", cl::Hidden,
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cl::desc("Compatibility option: ignored"));
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}
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static inline void addPass(PassManager &PM, Pass *P) {
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// Add the pass to the pass manager...
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PM.add(P);
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// If we are verifying all of the intermediate steps, add the verifier...
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if (Verify) PM.add(createVerifierPass());
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}
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void AddConfiguredTransformationPasses(PassManager &PM) {
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PM.add(createVerifierPass()); // Verify that input is correct
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addPass(PM, createLowerSetJmpPass()); // Lower llvm.setjmp/.longjmp
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addPass(PM, createFunctionResolvingPass()); // Resolve (...) functions
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// If the -strip-debug command line option was specified, do it.
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if (StripDebug)
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addPass(PM, createStripSymbolsPass(true));
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if (DisableOptimizations) return;
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addPass(PM, createRaiseAllocationsPass()); // call %malloc -> malloc inst
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addPass(PM, createCFGSimplificationPass()); // Clean up disgusting code
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addPass(PM, createPromoteMemoryToRegisterPass());// Kill useless allocas
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addPass(PM, createGlobalOptimizerPass()); // Optimize out global vars
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addPass(PM, createGlobalDCEPass()); // Remove unused fns and globs
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addPass(PM, createIPConstantPropagationPass());// IP Constant Propagation
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addPass(PM, createDeadArgEliminationPass()); // Dead argument elimination
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addPass(PM, createInstructionCombiningPass()); // Clean up after IPCP & DAE
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addPass(PM, createCFGSimplificationPass()); // Clean up after IPCP & DAE
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addPass(PM, createPruneEHPass()); // Remove dead EH info
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if (!DisableInline)
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addPass(PM, createFunctionInliningPass()); // Inline small functions
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addPass(PM, createSimplifyLibCallsPass()); // Library Call Optimizations
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addPass(PM, createArgumentPromotionPass()); // Scalarize uninlined fn args
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addPass(PM, createRaisePointerReferencesPass());// Recover type information
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addPass(PM, createTailDuplicationPass()); // Simplify cfg by copying code
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addPass(PM, createCFGSimplificationPass()); // Merge & remove BBs
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addPass(PM, createScalarReplAggregatesPass()); // Break up aggregate allocas
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addPass(PM, createInstructionCombiningPass()); // Combine silly seq's
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addPass(PM, createPredicateSimplifierPass()); // Canonicalize registers
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addPass(PM, createCondPropagationPass()); // Propagate conditionals
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addPass(PM, createTailCallEliminationPass()); // Eliminate tail calls
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addPass(PM, createCFGSimplificationPass()); // Merge & remove BBs
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addPass(PM, createReassociatePass()); // Reassociate expressions
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addPass(PM, createLICMPass()); // Hoist loop invariants
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addPass(PM, createLoopUnswitchPass()); // Unswitch loops.
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addPass(PM, createInstructionCombiningPass()); // Clean up after LICM/reassoc
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addPass(PM, createIndVarSimplifyPass()); // Canonicalize indvars
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addPass(PM, createLoopUnrollPass()); // Unroll small loops
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addPass(PM, createInstructionCombiningPass()); // Clean up after the unroller
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addPass(PM, createLoadValueNumberingPass()); // GVN for load instructions
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addPass(PM, createGCSEPass()); // Remove common subexprs
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addPass(PM, createSCCPPass()); // Constant prop with SCCP
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// Run instcombine after redundancy elimination to exploit opportunities
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// opened up by them.
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addPass(PM, createInstructionCombiningPass());
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addPass(PM, createCondPropagationPass()); // Propagate conditionals
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addPass(PM, createDeadStoreEliminationPass()); // Delete dead stores
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addPass(PM, createAggressiveDCEPass()); // SSA based 'Aggressive DCE'
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addPass(PM, createCFGSimplificationPass()); // Merge & remove BBs
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addPass(PM, createDeadTypeEliminationPass()); // Eliminate dead types
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addPass(PM, createConstantMergePass()); // Merge dup global constants
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}
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int main(int argc, char **argv) {
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try {
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cl::ParseCommandLineOptions(argc, argv,
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" llvm .s -> .o assembler for GCC\n");
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sys::PrintStackTraceOnErrorSignal();
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ParseError Err;
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std::auto_ptr<Module> M(ParseAssemblyFile(InputFilename,&Err));
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if (M.get() == 0) {
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std::cerr << argv[0] << ": " << Err.getMessage() << "\n";
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return 1;
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}
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std::ostream *Out = 0;
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if (OutputFilename == "") { // Didn't specify an output filename?
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if (InputFilename == "-") {
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OutputFilename = "-";
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} else {
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std::string IFN = InputFilename;
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int Len = IFN.length();
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if (IFN[Len-2] == '.' && IFN[Len-1] == 's') { // Source ends in .s?
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OutputFilename = std::string(IFN.begin(), IFN.end()-2);
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} else {
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OutputFilename = IFN; // Append a .o to it
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}
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OutputFilename += ".o";
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}
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}
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if (OutputFilename == "-")
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// FIXME: cout is not binary!
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Out = &std::cout;
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else {
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std::ios::openmode io_mode = std::ios::out | std::ios::trunc |
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std::ios::binary;
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Out = new std::ofstream(OutputFilename.c_str(), io_mode);
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// Make sure that the Out file gets unlinked from the disk if we get a
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// signal
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sys::RemoveFileOnSignal(sys::Path(OutputFilename));
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}
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if (!Out->good()) {
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std::cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
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return 1;
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}
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// In addition to just parsing the input from GCC, we also want to spiff
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// it up a little bit. Do this now.
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PassManager Passes;
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// Add an appropriate TargetData instance for this module...
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Passes.add(new TargetData(M.get()));
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// Add all of the transformation passes to the pass manager to do the
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// cleanup and optimization of the GCC output.
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AddConfiguredTransformationPasses(Passes);
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// Make sure everything is still good.
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Passes.add(createVerifierPass());
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// Write bytecode to file...
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Passes.add(new WriteBytecodePass(Out,false,!NoCompress));
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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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if (Out != &std::cout) delete Out;
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return 0;
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} catch (const std::string& msg) {
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std::cerr << argv[0] << ": " << msg << "\n";
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} catch (...) {
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std::cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
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}
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return 1;
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}
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