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081c34b725
must be called in the pass's constructor. This function uses static dependency declarations to recursively initialize the pass's dependencies. Clients that only create passes through the createFooPass() APIs will require no changes. Clients that want to use the CommandLine options for passes will need to manually call the appropriate initialization functions in PassInitialization.h before parsing commandline arguments. I have tested this with all standard configurations of clang and llvm-gcc on Darwin. It is possible that there are problems with the static dependencies that will only be visible with non-standard options. If you encounter any crash in pass registration/creation, please send the testcase to me directly. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116820 91177308-0d34-0410-b5e6-96231b3b80d8
74 lines
2.3 KiB
C++
74 lines
2.3 KiB
C++
//===-- StripDeadPrototypes.cpp - Remove unused function declarations ----===//
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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 pass loops over all of the functions in the input module, looking for
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// dead declarations and removes them. Dead declarations are declarations of
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// functions for which no implementation is available (i.e., declarations for
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// unused library functions).
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "strip-dead-prototypes"
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#include "llvm/Transforms/IPO.h"
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#include "llvm/Pass.h"
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#include "llvm/Module.h"
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#include "llvm/ADT/Statistic.h"
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using namespace llvm;
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STATISTIC(NumDeadPrototypes, "Number of dead prototypes removed");
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namespace {
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/// @brief Pass to remove unused function declarations.
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class StripDeadPrototypesPass : public ModulePass {
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public:
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static char ID; // Pass identification, replacement for typeid
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StripDeadPrototypesPass() : ModulePass(ID) {
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initializeStripDeadPrototypesPassPass(*PassRegistry::getPassRegistry());
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}
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virtual bool runOnModule(Module &M);
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};
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} // end anonymous namespace
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char StripDeadPrototypesPass::ID = 0;
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INITIALIZE_PASS(StripDeadPrototypesPass, "strip-dead-prototypes",
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"Strip Unused Function Prototypes", false, false)
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bool StripDeadPrototypesPass::runOnModule(Module &M) {
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bool MadeChange = false;
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// Erase dead function prototypes.
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for (Module::iterator I = M.begin(), E = M.end(); I != E; ) {
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Function *F = I++;
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// Function must be a prototype and unused.
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if (F->isDeclaration() && F->use_empty()) {
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F->eraseFromParent();
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++NumDeadPrototypes;
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MadeChange = true;
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}
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}
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// Erase dead global var prototypes.
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for (Module::global_iterator I = M.global_begin(), E = M.global_end();
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I != E; ) {
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GlobalVariable *GV = I++;
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// Global must be a prototype and unused.
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if (GV->isDeclaration() && GV->use_empty())
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GV->eraseFromParent();
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}
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// Return an indication of whether we changed anything or not.
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return MadeChange;
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}
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ModulePass *llvm::createStripDeadPrototypesPass() {
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return new StripDeadPrototypesPass();
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}
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