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https://github.com/c64scene-ar/llvm-6502.git
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3e15bf33e0
Due to darwin gcc bug, one version of darwin linker coalesces static const int, which defauts PassID based pass identification. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36652 91177308-0d34-0410-b5e6-96231b3b80d8
71 lines
2.2 KiB
C++
71 lines
2.2 KiB
C++
//===-- StripDeadPrototypes.cpp - Removed 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 was developed by Reid Spencer and is distributed under the
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// 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 pass loops over all of the functions in the input module, looking for
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// dead declarations and removes them.
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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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#include "llvm/Support/Compiler.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 VISIBILITY_HIDDEN StripDeadPrototypesPass : public ModulePass {
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public:
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static const char ID; // Pass identifcation, replacement for typeid
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StripDeadPrototypesPass() : ModulePass((intptr_t)&ID) { }
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virtual bool runOnModule(Module &M);
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};
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const char StripDeadPrototypesPass::ID = 0;
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RegisterPass<StripDeadPrototypesPass> X("strip-dead-prototypes",
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"Strip Unused Function Prototypes");
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} // end anonymous namespace
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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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