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simplify pass, delete dead gvar protos as well.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34394 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2007-02-18 22:10:34 +00:00
parent 439ba1fefa
commit eb47391994
1 changed files with 22 additions and 17 deletions
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37
lib/Transforms/IPO/StripDeadPrototypes.cpp
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@@ -12,13 +12,12 @@
// //
//===----------------------------------------------------------------------===// //===----------------------------------------------------------------------===//
#define DEBUG_TYPE "strip-dead-prototypes"
#include "llvm/Transforms/IPO.h" #include "llvm/Transforms/IPO.h"
#include "llvm/Pass.h" #include "llvm/Pass.h"
#include "llvm/Module.h" #include "llvm/Module.h"
#include "llvm/ADT/Statistic.h" #include "llvm/ADT/Statistic.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Compiler.h" #include "llvm/Support/Compiler.h"
#include <vector>
using namespace llvm; using namespace llvm;
STATISTIC(NumDeadPrototypes, "Number of dead prototypes removed"); STATISTIC(NumDeadPrototypes, "Number of dead prototypes removed");
@@ -37,24 +36,30 @@ RegisterPass<StripDeadPrototypesPass> X("strip-dead-prototypes",
} // end anonymous namespace } // end anonymous namespace
bool StripDeadPrototypesPass::runOnModule(Module &M) { bool StripDeadPrototypesPass::runOnModule(Module &M) {
// Collect all the functions we want to erase bool MadeChange = false;
std::vector<Function*> FuncsToErase;
for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) // Erase dead function prototypes.
if (I->isDeclaration() && // Function must be only a prototype for (Module::iterator I = M.begin(), E = M.end(); I != E; ) {
I->use_empty()) { // Function must not be used Function *F = I++;
FuncsToErase.push_back(&(*I)); // Function must be a prototype and unused.
if (F->isDeclaration() && F->use_empty()) {
F->eraseFromParent();
++NumDeadPrototypes;
MadeChange = true;
}
} }
// Erase the functions // Erase dead function prototypes.
for (std::vector<Function*>::iterator I = FuncsToErase.begin(), for (Module::global_iterator I = M.global_begin(), E = M.global_end();
E = FuncsToErase.end(); I != E; ++I ) I != E; ) {
(*I)->eraseFromParent(); GlobalVariable *GV = I++;
// Global must be a prototype and unused.
// Increment the statistic if (GV->isDeclaration() && GV->use_empty())
NumDeadPrototypes += FuncsToErase.size(); GV->eraseFromParent();
}
// Return an indication of whether we changed anything or not. // Return an indication of whether we changed anything or not.
return !FuncsToErase.empty(); return MadeChange;
} }
ModulePass *llvm::createStripDeadPrototypesPass() { ModulePass *llvm::createStripDeadPrototypesPass() {