Mercurial > projects > ldc
view gen/passes/StripExternals.cpp @ 1613:8f50a13d09a0
Merge DMD r286: remove dead code
---
dmd/interpret.c | 49 ++-----------------------------------------------
dmd/mars.c | 2 +-
2 files changed, 3 insertions(+), 48 deletions(-)
author | Leandro Lucarella <llucax@gmail.com> |
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date | Wed, 06 Jan 2010 15:18:21 -0300 |
parents | ed0feda76820 |
children |
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//===-- StripExternals.cpp - Strip available_externally symbols -----------===// // // The LLVM D Compiler // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // This transform stips the bodies of available_externally functions and // initializers of available_externally globals, turning them into external // declarations. // This is useful to allow Global DCE (-globaldce) to clean up references to // globals only used by available_externally functions and initializers. // //===----------------------------------------------------------------------===// #define DEBUG_TYPE "strip-externals" #include "Passes.h" #include "llvm/Module.h" #include "llvm/Pass.h" #include "llvm/ADT/Statistic.h" #include "llvm/Support/Compiler.h" #include "llvm/Support/Debug.h" #include "llvm/Support/raw_ostream.h" using namespace llvm; STATISTIC(NumFunctions, "Number of function bodies removed"); STATISTIC(NumVariables, "Number of global initializers removed"); namespace { struct VISIBILITY_HIDDEN StripExternals : public ModulePass { static char ID; // Pass identification, replacement for typeid StripExternals() : ModulePass(&ID) {} // run - Do the StripExternals pass on the specified module. // bool runOnModule(Module &M); }; } char StripExternals::ID = 0; static RegisterPass<StripExternals> X("strip-externals", "Strip available_externally bodies and initializers"); ModulePass *createStripExternalsPass() { return new StripExternals(); } bool StripExternals::runOnModule(Module &M) { bool Changed = false; for (Module::iterator I = M.begin(); I != M.end(); ) { if (I->hasAvailableExternallyLinkage()) { assert(!I->isDeclaration()&&"Declarations can't be available_externally"); Changed = true; ++NumFunctions; if (I->use_empty()) { DEBUG(errs() << "Deleting function: " << *I); Module::iterator todelete = I; ++I; todelete->eraseFromParent(); continue; } else { I->deleteBody(); DEBUG(errs() << "Deleted function body: " << *I); } } ++I; } for (Module::global_iterator I = M.global_begin(); I != M.global_end(); ) { if (I->hasAvailableExternallyLinkage()) { assert(!I->isDeclaration()&&"Declarations can't be available_externally"); Changed = true; ++NumVariables; if (I->use_empty()) { DEBUG(errs() << "Deleting global: " << *I); Module::global_iterator todelete = I; ++I; todelete->eraseFromParent(); continue; } else { I->setInitializer(0); I->setLinkage(GlobalValue::ExternalLinkage); DEBUG(errs() << "Deleted initializer: " << *I); } } ++I; } return Changed; }