//
// 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.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// number of counters inserted.
//
//===----------------------------------------------------------------------===//
-
+#define DEBUG_TYPE "insert-edge-profiling"
#include "ProfilingUtils.h"
-#include "llvm/Constants.h"
-#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
#include "llvm/Pass.h"
-#include "llvm/Support/Streams.h"
+#include "llvm/Support/raw_ostream.h"
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
#include "llvm/Transforms/Instrumentation.h"
+#include "llvm/ADT/Statistic.h"
#include <set>
using namespace llvm;
+STATISTIC(NumEdgesInserted, "The # of edges inserted.");
+
namespace {
class EdgeProfiler : public ModulePass {
bool runOnModule(Module &M);
- };
+ public:
+ static char ID; // Pass identification, replacement for typeid
+ EdgeProfiler() : ModulePass(ID) {}
- RegisterPass<EdgeProfiler> X("insert-edge-profiling",
- "Insert instrumentation for edge profiling");
+ virtual const char *getPassName() const {
+ return "Edge Profiler";
+ }
+ };
}
+char EdgeProfiler::ID = 0;
+INITIALIZE_PASS(EdgeProfiler, "insert-edge-profiling",
+ "Insert instrumentation for edge profiling", false, false);
+
ModulePass *llvm::createEdgeProfilerPass() { return new EdgeProfiler(); }
bool EdgeProfiler::runOnModule(Module &M) {
- Function *Main = M.getMainFunction();
+ Function *Main = M.getFunction("main");
if (Main == 0) {
- cerr << "WARNING: cannot insert edge profiling into a module"
- << " with no main function!\n";
+ errs() << "WARNING: cannot insert edge profiling into a module"
+ << " with no main function!\n";
return false; // No main, no instrumentation!
}
std::set<BasicBlock*> BlocksToInstrument;
unsigned NumEdges = 0;
- for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F)
+ for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F) {
+ if (F->isDeclaration()) continue;
+ // Reserve space for (0,entry) edge.
+ ++NumEdges;
for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) {
// Keep track of which blocks need to be instrumented. We don't want to
// instrument blocks that are added as the result of breaking critical
BlocksToInstrument.insert(BB);
NumEdges += BB->getTerminator()->getNumSuccessors();
}
+ }
- const Type *ATy = ArrayType::get(Type::Int32Ty, NumEdges);
+ const Type *ATy = ArrayType::get(Type::getInt32Ty(M.getContext()), NumEdges);
GlobalVariable *Counters =
- new GlobalVariable(ATy, false, GlobalValue::InternalLinkage,
- Constant::getNullValue(ATy), "EdgeProfCounters", &M);
+ new GlobalVariable(M, ATy, false, GlobalValue::InternalLinkage,
+ Constant::getNullValue(ATy), "EdgeProfCounters");
+ NumEdgesInserted = NumEdges;
// Instrument all of the edges...
unsigned i = 0;
- for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F)
+ for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F) {
+ if (F->isDeclaration()) continue;
+ // Create counter for (0,entry) edge.
+ IncrementCounterInBlock(&F->getEntryBlock(), i++, Counters);
for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB)
if (BlocksToInstrument.count(BB)) { // Don't instrument inserted blocks
// Okay, we have to add a counter of each outgoing edge. If the
// Okay, we are guaranteed that the edge is no longer critical. If we
// only have a single successor, insert the counter in this block,
// otherwise insert it in the successor block.
- if (TI->getNumSuccessors() == 0) {
+ if (TI->getNumSuccessors() == 1) {
// Insert counter at the start of the block
IncrementCounterInBlock(BB, i++, Counters);
} else {
}
}
}
+ }
// Add the initialization call to main.
InsertProfilingInitCall(Main, "llvm_start_edge_profiling", Counters);