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