Changes in directory llvm/lib/Transforms/IPO:
StripDeadPrototypes.cpp added (r1.1)
---
Log message:
Create a pass to strip dead function declarations (prototypes). This is
for use by llvm-extract and bugpoint.
---
Diffs of the changes: (+61 -0)
StripDeadPrototypes.cpp | 61 ++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 61 insertions(+)
Index: llvm/lib/Transforms/IPO/StripDeadPrototypes.cpp
diff -c /dev/null llvm/lib/Transforms/IPO/StripDeadPrototypes.cpp:1.1
*** /dev/null Mon Feb 5 14:24:35 2007
--- llvm/lib/Transforms/IPO/StripDeadPrototypes.cpp Mon Feb 5 14:24:25 2007
***************
*** 0 ****
--- 1,61 ----
+ //===-- StripDeadPrototypes.cpp - Removed unused function declarations
----===//
+ //
+ // The LLVM Compiler Infrastructure
+ //
+ // This file was developed by Reid Spencer and is distributed under the
+ // University of Illinois Open Source License. See LICENSE.TXT for details.
+ //
+
//===----------------------------------------------------------------------===//
+ //
+ // This pass loops over all of the functions in the input module, looking for
+ // dead declarations and removes them.
+ //
+
//===----------------------------------------------------------------------===//
+
+ #include "llvm/Transforms/IPO.h"
+ #include "llvm/Pass.h"
+ #include "llvm/Module.h"
+ #include "llvm/ADT/Statistic.h"
+ #include "llvm/Support/Debug.h"
+ #include <vector>
+ using namespace llvm;
+
+ STATISTIC(NumDeadPrototypes, "Number of dead prototypes removed");
+
+ namespace {
+
+ /// @brief Pass to remove unused function declarations.
+ class StripDeadPrototypesPass : public ModulePass {
+ public:
+ StripDeadPrototypesPass() { }
+ virtual bool runOnModule(Module &M);
+ };
+ RegisterPass<StripDeadPrototypesPass> X("strip-dead-prototypes",
+ "Strip Unused Function Prototypes");
+
+ bool StripDeadPrototypesPass::runOnModule(Module &M) {
+ // Collect all the functions we want to erase
+ std::vector<Function*> FuncsToErase;
+ for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
+ if (I->isDeclaration() && // Function must be only a prototype
+ I->use_empty()) { // Function must not be used
+ FuncsToErase.push_back(&(*I));
+ }
+
+ // Erase the functions
+ for (std::vector<Function*>::iterator I = FuncsToErase.begin(),
+ E = FuncsToErase.end(); I != E; ++I )
+ (*I)->eraseFromParent();
+
+ // Increment the statistic
+ NumDeadPrototypes += FuncsToErase.size();
+
+ // Return an indication of whether we changed anything or not.
+ return !FuncsToErase.empty();
+ }
+
+ } // end anonymous namespace
+
+ ModulePass *llvm::createStripDeadPrototypesPass() {
+ return new StripDeadPrototypesPass();
+ }
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