#include "llvm/Module.h"
#include "llvm/Pass.h"
#include "llvm/Assembly/Writer.h"
+#include "Support/CommandLine.h"
#include "Support/StringExtras.h"
+#include <algorithm>
#include <sstream>
using std::vector;
using std::string;
+static cl::Flag DisablePtrHashing("tracedisablehashdisable",
+ "Disable pointer hashing", cl::NoFlags);
+
+static cl::StringList TraceFuncName ("tracefunc", "trace only specific funct"
+ "ions", cl::NoFlags);
+
+
+// We trace a particular function if no functions to trace were specified
+// or if the function is in the specified list.
+//
+inline bool
+TraceThisFunction(Function* func)
+{
+ if (TraceFuncName.getNumOccurances() == 0)
+ return true;
+
+ return std::find(TraceFuncName.begin(), TraceFuncName.end(), func->getName())
+ != TraceFuncName.end();
+}
+
+
namespace {
+ struct ExternalFuncs {
+ Function *PrintfFunc, *HashPtrFunc, *ReleasePtrFunc;
+ Function *RecordPtrFunc, *PushOnEntryFunc, *ReleaseOnReturnFunc;
+ void doInitialization(Module &M); // Add prototypes for external functions
+ };
+
class InsertTraceCode : public FunctionPass {
bool TraceBasicBlockExits, TraceFunctionExits;
- Function *PrintfFunc;
+ ExternalFuncs externalFuncs;
public:
InsertTraceCode(bool traceBasicBlockExits, bool traceFunctionExits)
: TraceBasicBlockExits(traceBasicBlockExits),
TraceFunctionExits(traceFunctionExits) {}
+
+ const char *getPassName() const { return "Trace Code Insertion"; }
- // Add a prototype for printf if it is not already in the program.
+ // Add a prototype for runtime functions not already in the program.
//
- bool doInitialization(Module *M);
+ bool doInitialization(Module &M);
//--------------------------------------------------------------------------
// Function InsertCodeToTraceValues
// exits as specified by `traceBasicBlockExits' and `traceFunctionExits'.
//
static bool doit(Function *M, bool traceBasicBlockExits,
- bool traceFunctionExits, Function *Printf);
-
+ bool traceFunctionExits, ExternalFuncs& externalFuncs);
+
// runOnFunction - This method does the work.
//
- bool runOnFunction(Function *F) {
- return doit(F, TraceBasicBlockExits, TraceFunctionExits, PrintfFunc);
+ bool runOnFunction(Function &F) {
+ return doit(&F, TraceBasicBlockExits, TraceFunctionExits, externalFuncs);
+ }
+
+ virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+ AU.preservesCFG();
}
};
} // end anonymous namespace
return new InsertTraceCode(true, true);
}
-
-
-
-// Add a prototype for printf if it is not already in the program.
+// Add a prototype for external functions used by the tracing code.
//
-bool InsertTraceCode::doInitialization(Module *M) {
+void ExternalFuncs::doInitialization(Module &M) {
const Type *SBP = PointerType::get(Type::SByteTy);
const FunctionType *MTy =
FunctionType::get(Type::IntTy, vector<const Type*>(1, SBP), true);
+ PrintfFunc = M.getOrInsertFunction("printf", MTy);
+
+ // uint (sbyte*)
+ const FunctionType *hashFuncTy =
+ FunctionType::get(Type::UIntTy, vector<const Type*>(1, SBP), false);
+ HashPtrFunc = M.getOrInsertFunction("HashPointerToSeqNum", hashFuncTy);
+
+ // void (sbyte*)
+ const FunctionType *voidSBPFuncTy =
+ FunctionType::get(Type::VoidTy, vector<const Type*>(1, SBP), false);
+
+ ReleasePtrFunc = M.getOrInsertFunction("ReleasePointerSeqNum", voidSBPFuncTy);
+ RecordPtrFunc = M.getOrInsertFunction("RecordPointer", voidSBPFuncTy);
+
+ const FunctionType *voidvoidFuncTy =
+ FunctionType::get(Type::VoidTy, vector<const Type*>(), false);
+
+ PushOnEntryFunc = M.getOrInsertFunction("PushPointerSet", voidvoidFuncTy);
+ ReleaseOnReturnFunc = M.getOrInsertFunction("ReleasePointersPopSet",
+ voidvoidFuncTy);
+}
+
- PrintfFunc = M->getOrInsertFunction("printf", MTy);
+// Add a prototype for external functions used by the tracing code.
+//
+bool InsertTraceCode::doInitialization(Module &M) {
+ externalFuncs.doInitialization(M);
return false;
}
if (V == 0) return "";
if (V->getType()->isFloatingPoint())
return "%g";
- else if (V->getType() == Type::LabelTy || isa<PointerType>(V->getType()))
+ else if (V->getType() == Type::LabelTy)
return "0x%p";
+ else if (isa<PointerType>(V->getType()))
+ return DisablePtrHashing ? "0x%p" : "%d";
else if (V->getType()->isIntegral() || V->getType() == Type::BoolTy)
return "%d";
-
+
assert(0 && "Illegal value to print out...");
return "";
}
-static void InsertPrintInst(Value *V, BasicBlock *BB, BasicBlock::iterator &BBI,
- string Message, Function *Printf) {
+static void InsertPrintInst(Value *V,BasicBlock *BB, BasicBlock::iterator &BBI,
+ string Message,
+ Function *Printf, Function* HashPtrToSeqNum) {
// Escape Message by replacing all % characters with %% chars.
unsigned Offset = 0;
while ((Offset = Message.find('%', Offset)) != string::npos) {
new GetElementPtrInst(fmtVal,
vector<Value*>(2,ConstantUInt::get(Type::UIntTy, 0)),
"trstr");
- BBI = BB->getInstList().insert(BBI, GEP)+1;
+ BBI = ++BB->getInstList().insert(BBI, GEP);
+
+ // Insert a call to the hash function if this is a pointer value
+ if (V && isa<PointerType>(V->getType()) && !DisablePtrHashing) {
+ const Type *SBP = PointerType::get(Type::SByteTy);
+ if (V->getType() != SBP) { // Cast pointer to be sbyte*
+ Instruction *I = new CastInst(V, SBP, "Hash_cast");
+ BBI = ++BB->getInstList().insert(BBI, I);
+ V = I;
+ }
+
+ vector<Value*> HashArgs(1, V);
+ V = new CallInst(HashPtrToSeqNum, HashArgs, "ptrSeqNum");
+ BBI = ++BB->getInstList().insert(BBI, cast<Instruction>(V));
+ }
// Insert the first print instruction to print the string flag:
vector<Value*> PrintArgs;
PrintArgs.push_back(GEP);
if (V) PrintArgs.push_back(V);
Instruction *I = new CallInst(Printf, PrintArgs, "trace");
- BBI = BB->getInstList().insert(BBI, I)+1;
+ BBI = ++BB->getInstList().insert(BBI, I);
}
static void InsertVerbosePrintInst(Value *V, BasicBlock *BB,
BasicBlock::iterator &BBI,
- const string &Message, Function *Printf) {
+ const string &Message, Function *Printf,
+ Function* HashPtrToSeqNum) {
std::ostringstream OutStr;
if (V) WriteAsOperand(OutStr, V);
- InsertPrintInst(V, BB, BBI, Message+OutStr.str()+" = ", Printf);
+ InsertPrintInst(V, BB, BBI, Message+OutStr.str()+" = ",
+ Printf, HashPtrToSeqNum);
}
+static void
+InsertReleaseInst(Value *V, BasicBlock *BB,
+ BasicBlock::iterator &BBI,
+ Function* ReleasePtrFunc) {
+
+ const Type *SBP = PointerType::get(Type::SByteTy);
+ if (V->getType() != SBP) { // Cast pointer to be sbyte*
+ Instruction *I = new CastInst(V, SBP, "RPSN_cast");
+ BBI = ++BB->getInstList().insert(BBI, I);
+ V = I;
+ }
+ vector<Value*> releaseArgs(1, V);
+ Instruction *I = new CallInst(ReleasePtrFunc, releaseArgs);
+ BBI = ++BB->getInstList().insert(BBI, I);
+}
+
+static void
+InsertRecordInst(Value *V, BasicBlock *BB,
+ BasicBlock::iterator &BBI,
+ Function* RecordPtrFunc) {
+ const Type *SBP = PointerType::get(Type::SByteTy);
+ if (V->getType() != SBP) { // Cast pointer to be sbyte*
+ Instruction *I = new CastInst(V, SBP, "RP_cast");
+ BBI = ++BB->getInstList().insert(BBI, I);
+ V = I;
+ }
+ vector<Value*> releaseArgs(1, V);
+ Instruction *I = new CallInst(RecordPtrFunc, releaseArgs);
+ BBI = ++BB->getInstList().insert(BBI, I);
+}
+
+static void
+InsertPushOnEntryFunc(Function *M,
+ Function* PushOnEntryFunc) {
+ // Get an iterator to point to the insertion location
+ BasicBlock &BB = M->getEntryNode();
+ BB.getInstList().insert(BB.begin(), new CallInst(PushOnEntryFunc,
+ vector<Value*>()));
+}
+
+static void
+InsertReleaseRecordedInst(BasicBlock *BB,
+ Function* ReleaseOnReturnFunc) {
+ BasicBlock::iterator BBI = BB->end()--;
+ BBI = ++BB->getInstList().insert(BBI, new CallInst(ReleaseOnReturnFunc,
+ vector<Value*>()));
+}
+
+// Look for alloca and free instructions. These are the ptrs to release.
+// Release the free'd pointers immediately. Record the alloca'd pointers
+// to be released on return from the current function.
+//
+static void
+ReleasePtrSeqNumbers(BasicBlock *BB,
+ ExternalFuncs& externalFuncs) {
+
+ for (BasicBlock::iterator II=BB->begin(); II != BB->end(); ++II) {
+ if (FreeInst *FI = dyn_cast<FreeInst>(&*II))
+ InsertReleaseInst(FI->getOperand(0), BB,II,externalFuncs.ReleasePtrFunc);
+ else if (AllocaInst *AI = dyn_cast<AllocaInst>(&*II))
+ {
+ BasicBlock::iterator nextI = ++II;
+ InsertRecordInst(AI, BB, nextI, externalFuncs.RecordPtrFunc);
+ II = --nextI;
+ }
+ }
+}
+
// Insert print instructions at the end of the basic block *bb
// for each value in valueVec[] that is live at the end of that basic block,
// *bb must be the block in which the value is computed;
// this is not checked here.
//
-static void TraceValuesAtBBExit(BasicBlock *BB, Function *Printf,
+static void TraceValuesAtBBExit(BasicBlock *BB,
+ Function *Printf, Function* HashPtrToSeqNum,
vector<Instruction*> *valuesStoredInFunction) {
// Get an iterator to point to the insertion location, which is
// just before the terminator instruction.
//
- BasicBlock::iterator InsertPos = BB->end()-1;
- assert((*InsertPos)->isTerminator());
+ BasicBlock::iterator InsertPos = BB->end()--;
+ assert(BB->back().isTerminator());
// If the terminator is a conditional branch, insert the trace code just
// before the instruction that computes the branch condition (just to
if (!Branch->isUnconditional())
if (Instruction *I = dyn_cast<Instruction>(Branch->getCondition()))
if (I->getParent() == BB) {
- SetCC = I;
- while (*InsertPos != SetCC)
- --InsertPos; // Back up until we can insert before the setcc
+ InsertPos = SetCC = I; // Back up until we can insert before the setcc
}
- // Copy all of the instructions into a vector to avoid problems with Setcc
- const vector<Instruction*> Insts(BB->begin(), InsertPos);
-
std::ostringstream OutStr;
WriteAsOperand(OutStr, BB, false);
- InsertPrintInst(0, BB, InsertPos, "LEAVING BB:" + OutStr.str(), Printf);
+ InsertPrintInst(0, BB, InsertPos, "LEAVING BB:" + OutStr.str(),
+ Printf, HashPtrToSeqNum);
// Insert a print instruction for each value.
//
- for (vector<Instruction*>::const_iterator II = Insts.begin(),
- IE = Insts.end(); II != IE; ++II) {
- Instruction *I = *II;
- if (StoreInst *SI = dyn_cast<StoreInst>(I)) {
+ for (BasicBlock::iterator II = BB->begin(), IE = InsertPos++; II != IE; ++II){
+ if (StoreInst *SI = dyn_cast<StoreInst>(&*II)) {
assert(valuesStoredInFunction &&
"Should not be printing a store instruction at function exit");
LoadInst *LI = new LoadInst(SI->getPointerOperand(), SI->copyIndices(),
- "reload");
- InsertPos = BB->getInstList().insert(InsertPos, LI) + 1;
+ "reload."+SI->getPointerOperand()->getName());
+ InsertPos = ++BB->getInstList().insert(InsertPos, LI);
valuesStoredInFunction->push_back(LI);
}
- if (ShouldTraceValue(I))
- InsertVerbosePrintInst(I, BB, InsertPos, " ", Printf);
+ if (ShouldTraceValue(II))
+ InsertVerbosePrintInst(II, BB, InsertPos, " ", Printf, HashPtrToSeqNum);
}
}
-static inline void InsertCodeToShowFunctionEntry(Function *M, Function *Printf){
+static inline void InsertCodeToShowFunctionEntry(Function *M, Function *Printf,
+ Function* HashPtrToSeqNum){
// Get an iterator to point to the insertion location
- BasicBlock *BB = M->getEntryNode();
- BasicBlock::iterator BBI = BB->begin();
+ BasicBlock &BB = M->getEntryNode();
+ BasicBlock::iterator BBI = BB.begin();
std::ostringstream OutStr;
WriteAsOperand(OutStr, M, true);
- InsertPrintInst(0, BB, BBI, "ENTERING FUNCTION: " + OutStr.str(), Printf);
+ InsertPrintInst(0, &BB, BBI, "ENTERING FUNCTION: " + OutStr.str(),
+ Printf, HashPtrToSeqNum);
// Now print all the incoming arguments
- const Function::ArgumentListType &argList = M->getArgumentList();
unsigned ArgNo = 0;
- for (Function::ArgumentListType::const_iterator
- I = argList.begin(), E = argList.end(); I != E; ++I, ++ArgNo) {
- InsertVerbosePrintInst((Value*)*I, BB, BBI,
- " Arg #" + utostr(ArgNo), Printf);
+ for (Function::aiterator I = M->abegin(), E = M->aend(); I != E; ++I,++ArgNo){
+ InsertVerbosePrintInst(I, &BB, BBI,
+ " Arg #" + utostr(ArgNo) + ": ", Printf,
+ HashPtrToSeqNum);
}
}
static inline void InsertCodeToShowFunctionExit(BasicBlock *BB,
- Function *Printf) {
+ Function *Printf,
+ Function* HashPtrToSeqNum) {
// Get an iterator to point to the insertion location
- BasicBlock::iterator BBI = BB->end()-1;
- ReturnInst *Ret = cast<ReturnInst>(*BBI);
+ BasicBlock::iterator BBI = BB->end()--;
+ ReturnInst &Ret = cast<ReturnInst>(BB->back());
std::ostringstream OutStr;
WriteAsOperand(OutStr, BB->getParent(), true);
- InsertPrintInst(0, BB, BBI, "LEAVING FUNCTION: " + OutStr.str(), Printf);
+ InsertPrintInst(0, BB, BBI, "LEAVING FUNCTION: " + OutStr.str(),
+ Printf, HashPtrToSeqNum);
// print the return value, if any
if (BB->getParent()->getReturnType() != Type::VoidTy)
- InsertPrintInst(Ret->getReturnValue(), BB, BBI, " Returning: ", Printf);
+ InsertPrintInst(Ret.getReturnValue(), BB, BBI, " Returning: ",
+ Printf, HashPtrToSeqNum);
}
bool InsertTraceCode::doit(Function *M, bool traceBasicBlockExits,
- bool traceFunctionEvents, Function *Printf) {
+ bool traceFunctionEvents,
+ ExternalFuncs& externalFuncs) {
if (!traceBasicBlockExits && !traceFunctionEvents)
return false;
+ if (!TraceThisFunction(M))
+ return false;
+
vector<Instruction*> valuesStoredInFunction;
vector<BasicBlock*> exitBlocks;
+ // Insert code to trace values at function entry
if (traceFunctionEvents)
- InsertCodeToShowFunctionEntry(M, Printf);
+ InsertCodeToShowFunctionEntry(M, externalFuncs.PrintfFunc,
+ externalFuncs.HashPtrFunc);
- for (Function::iterator BI = M->begin(); BI != M->end(); ++BI) {
- BasicBlock *BB = *BI;
+ // Push a pointer set for recording alloca'd pointers at entry.
+ if (!DisablePtrHashing)
+ InsertPushOnEntryFunc(M, externalFuncs.PushOnEntryFunc);
+
+ for (Function::iterator BB = M->begin(); BB != M->end(); ++BB) {
if (isa<ReturnInst>(BB->getTerminator()))
exitBlocks.push_back(BB); // record this as an exit block
if (traceBasicBlockExits)
- TraceValuesAtBBExit(BB, Printf, &valuesStoredInFunction);
+ TraceValuesAtBBExit(BB, externalFuncs.PrintfFunc,
+ externalFuncs.HashPtrFunc, &valuesStoredInFunction);
+
+ if (!DisablePtrHashing) // release seq. numbers on free/ret
+ ReleasePtrSeqNumbers(BB, externalFuncs);
}
-
- if (traceFunctionEvents)
- for (unsigned i=0; i < exitBlocks.size(); ++i) {
-#if 0
- TraceValuesAtBBExit(valuesStoredInFunction, exitBlocks[i], module,
- /*indent*/ 0, /*isFunctionExit*/ true,
- /*valuesStoredInFunction*/ NULL);
-#endif
- InsertCodeToShowFunctionExit(exitBlocks[i], Printf);
+
+ for (unsigned i=0; i < exitBlocks.size(); ++i)
+ {
+ // Insert code to trace values at function exit
+ if (traceFunctionEvents)
+ InsertCodeToShowFunctionExit(exitBlocks[i], externalFuncs.PrintfFunc,
+ externalFuncs.HashPtrFunc);
+
+ // Release all recorded pointers before RETURN. Do this LAST!
+ if (!DisablePtrHashing)
+ InsertReleaseRecordedInst(exitBlocks[i],
+ externalFuncs.ReleaseOnReturnFunc);
}
-
+
return true;
}
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