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129 lines
4.3 KiB
C++
129 lines
4.3 KiB
C++
//===- Optimize.cpp - Optimize a complete program -------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements all optimization of the linked module for llvm-ld.
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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/Support/CommandLine.h"
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#include "llvm/Support/StandardPasses.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Support/DynamicLibrary.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Support/PassNameParser.h"
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#include "llvm/Support/PluginLoader.h"
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using namespace llvm;
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// Pass Name Options as generated by the PassNameParser
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static cl::list<const PassInfo*, bool, PassNameParser>
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OptimizationList(cl::desc("Optimizations available:"));
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//Don't verify at the end
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static cl::opt<bool> DontVerify("disable-verify", cl::ReallyHidden);
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static cl::opt<bool> DisableInline("disable-inlining",
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cl::desc("Do not run the inliner pass"));
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static 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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static cl::opt<bool> DisableInternalize("disable-internalize",
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cl::desc("Do not mark all symbols as internal"));
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static cl::opt<bool> VerifyEach("verify-each",
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cl::desc("Verify intermediate results of all passes"));
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static cl::alias ExportDynamic("export-dynamic",
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cl::aliasopt(DisableInternalize),
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cl::desc("Alias for -disable-internalize"));
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static cl::opt<bool> Strip("strip-all",
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cl::desc("Strip all symbol info from executable"));
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static cl::alias A0("s", cl::desc("Alias for --strip-all"),
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cl::aliasopt(Strip));
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static cl::opt<bool> StripDebug("strip-debug",
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cl::desc("Strip debugger symbol info from executable"));
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static cl::alias A1("S", cl::desc("Alias for --strip-debug"),
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cl::aliasopt(StripDebug));
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// A utility function that adds a pass to the pass manager but will also add
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// a verifier pass after if we're supposed to verify.
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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 (VerifyEach)
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PM.add(createVerifierPass());
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}
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namespace llvm {
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/// Optimize - Perform link time optimizations. This will run the scalar
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/// optimizations, any loaded plugin-optimization modules, and then the
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/// inter-procedural optimizations if applicable.
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void Optimize(Module* M) {
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// Instantiate the pass manager to organize the passes.
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PassManager Passes;
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// If we're verifying, start off with a verification pass.
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if (VerifyEach)
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Passes.add(createVerifierPass());
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// Add an appropriate TargetData instance for this module...
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addPass(Passes, new TargetData(M));
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if (!DisableOptimizations)
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createStandardLTOPasses(&Passes, !DisableInternalize, !DisableInline,
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VerifyEach);
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// If the -s or -S command line options were specified, strip the symbols out
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// of the resulting program to make it smaller. -s and -S are GNU ld options
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// that we are supporting; they alias -strip-all and -strip-debug.
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if (Strip || StripDebug)
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addPass(Passes, createStripSymbolsPass(StripDebug && !Strip));
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// Create a new optimization pass for each one specified on the command line
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std::auto_ptr<TargetMachine> target;
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for (unsigned i = 0; i < OptimizationList.size(); ++i) {
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const PassInfo *Opt = OptimizationList[i];
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if (Opt->getNormalCtor())
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addPass(Passes, Opt->getNormalCtor()());
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else
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errs() << "llvm-ld: cannot create pass: " << Opt->getPassName()
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<< "\n";
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}
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// The user's passes may leave cruft around. Clean up after them them but
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// only if we haven't got DisableOptimizations set
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if (!DisableOptimizations) {
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addPass(Passes, createInstructionCombiningPass());
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addPass(Passes, createCFGSimplificationPass());
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addPass(Passes, createAggressiveDCEPass());
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addPass(Passes, createGlobalDCEPass());
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}
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// Make sure everything is still good.
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if (!DontVerify)
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Passes.add(createVerifierPass());
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// Run our queue of passes all at once now, efficiently.
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Passes.run(*M);
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}
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}
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