//===- LoopExtractor.cpp - Extract each loop into a new function ----------===//
-//
+//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
-//
+//
//===----------------------------------------------------------------------===//
//
// A pass wrapper around the ExtractLoop() scalar transformation to extract each
//
//===----------------------------------------------------------------------===//
+#define DEBUG_TYPE "loop-extract"
#include "llvm/Transforms/IPO.h"
-#include "llvm/iTerminators.h"
+#include "llvm/Instructions.h"
#include "llvm/Module.h"
#include "llvm/Pass.h"
#include "llvm/Analysis/Dominators.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Transforms/Scalar.h"
#include "llvm/Transforms/Utils/FunctionUtils.h"
-#include "Support/Statistic.h"
+#include "llvm/ADT/Statistic.h"
using namespace llvm;
+STATISTIC(NumExtracted, "Number of loops extracted");
+
namespace {
- Statistic<> NumExtracted("loop-extract", "Number of loops extracted");
-
// FIXME: This is not a function pass, but the PassManager doesn't allow
// Module passes to require FunctionPasses, so we can't get loop info if we're
// not a function pass.
LoopExtractor(unsigned numLoops = ~0) : NumLoops(numLoops) {}
virtual bool runOnFunction(Function &F);
-
+
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequiredID(BreakCriticalEdgesID);
AU.addRequiredID(LoopSimplifyID);
}
};
- RegisterOpt<LoopExtractor>
+ RegisterPass<LoopExtractor>
X("loop-extract", "Extract loops into new functions");
/// SingleLoopExtractor - For bugpoint.
SingleLoopExtractor() : LoopExtractor(1) {}
};
- RegisterOpt<SingleLoopExtractor>
+ RegisterPass<SingleLoopExtractor>
Y("loop-extract-single", "Extract at most one loop into a new function");
-} // End anonymous namespace
+} // End anonymous namespace
+
+// createLoopExtractorPass - This pass extracts all natural loops from the
+// program into a function if it can.
+//
+FunctionPass *llvm::createLoopExtractorPass() { return new LoopExtractor(); }
bool LoopExtractor::runOnFunction(Function &F) {
LoopInfo &LI = getAnalysis<LoopInfo>();
// than a minimal wrapper around the loop, extract the loop.
Loop *TLL = *LI.begin();
bool ShouldExtractLoop = false;
-
+
// Extract the loop if the entry block doesn't branch to the loop header.
TerminatorInst *EntryTI = F.getEntryBlock().getTerminator();
if (!isa<BranchInst>(EntryTI) ||
- !cast<BranchInst>(EntryTI)->isUnconditional() ||
+ !cast<BranchInst>(EntryTI)->isUnconditional() ||
EntryTI->getSuccessor(0) != TLL->getHeader())
ShouldExtractLoop = true;
else {
break;
}
}
-
+
if (ShouldExtractLoop) {
if (NumLoops == 0) return Changed;
--NumLoops;
// createSingleLoopExtractorPass - This pass extracts one natural loop from the
// program into a function if it can. This is used by bugpoint.
//
-Pass *llvm::createSingleLoopExtractorPass() {
+FunctionPass *llvm::createSingleLoopExtractorPass() {
return new SingleLoopExtractor();
}
+
+
+namespace {
+ /// BlockExtractorPass - This pass is used by bugpoint to extract all blocks
+ /// from the module into their own functions except for those specified by the
+ /// BlocksToNotExtract list.
+ class BlockExtractorPass : public ModulePass {
+ std::vector<BasicBlock*> BlocksToNotExtract;
+ public:
+ BlockExtractorPass(std::vector<BasicBlock*> &B) : BlocksToNotExtract(B) {}
+ BlockExtractorPass() {}
+
+ bool runOnModule(Module &M);
+ };
+ RegisterPass<BlockExtractorPass>
+ XX("extract-blocks", "Extract Basic Blocks From Module (for bugpoint use)");
+}
+
+// createBlockExtractorPass - This pass extracts all blocks (except those
+// specified in the argument list) from the functions in the module.
+//
+ModulePass *llvm::createBlockExtractorPass(std::vector<BasicBlock*> &BTNE) {
+ return new BlockExtractorPass(BTNE);
+}
+
+bool BlockExtractorPass::runOnModule(Module &M) {
+ std::set<BasicBlock*> TranslatedBlocksToNotExtract;
+ for (unsigned i = 0, e = BlocksToNotExtract.size(); i != e; ++i) {
+ BasicBlock *BB = BlocksToNotExtract[i];
+ Function *F = BB->getParent();
+
+ // Map the corresponding function in this module.
+ Function *MF = M.getFunction(F->getName(), F->getFunctionType());
+
+ // Figure out which index the basic block is in its function.
+ Function::iterator BBI = MF->begin();
+ std::advance(BBI, std::distance(F->begin(), Function::iterator(BB)));
+ TranslatedBlocksToNotExtract.insert(BBI);
+ }
+
+ // Now that we know which blocks to not extract, figure out which ones we WANT
+ // to extract.
+ std::vector<BasicBlock*> BlocksToExtract;
+ for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F)
+ for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB)
+ if (!TranslatedBlocksToNotExtract.count(BB))
+ BlocksToExtract.push_back(BB);
+
+ for (unsigned i = 0, e = BlocksToExtract.size(); i != e; ++i)
+ ExtractBasicBlock(BlocksToExtract[i]);
+
+ return !BlocksToExtract.empty();
+}