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/*
* (C) 2010 by Computer System Laboratory, IIS, Academia Sinica, Taiwan.
* See COPYRIGHT in top-level directory.
*/
#include "llvm/Transforms/Utils/Cloning.h"
#include "llvm-debug.h"
#include "llvm-soft-perfmon.h"
#include "llvm-pass.h"
#include "llvm-opc.h"
#include "llvm.h"
#include "utils.h"
#define PASS_NAME "ProfileExec"
extern LLVMEnv *LLEnv;
/*
* Profile Pass
*/
class ProfileExec : public FunctionPass {
enum {
IDX_LOOP = 0,
IDX_EXIT,
IDX_INBR,
};
IRFactory *IF;
const DataLayout *DL;
MDFactory *MF;
IntegerType *Int8Ty;
IntegerType *Int32Ty;
IntegerType *Int64Ty;
IntegerType *IntPtrTy;
PointerType *Int8PtrTy;
PointerType *Int32PtrTy;
PointerType *Int64PtrTy;
public:
static char ID;
explicit ProfileExec() : FunctionPass(ID) {}
explicit ProfileExec(IRFactory *IF)
: FunctionPass(ID), IF(IF), DL(IF->getDL()), MF(IF->getMDFactory())
{
LLVMContext &Context = IF->getContext();;
Int8Ty = IntegerType::get(Context, 8);
Int32Ty = IntegerType::get(Context, 32);
Int64Ty = IntegerType::get(Context, 64);
IntPtrTy = DL->getIntPtrType(Context);
Int8PtrTy = Type::getInt8PtrTy(Context, 0);
Int32PtrTy = Type::getInt32PtrTy(Context, 0);
Int64PtrTy = Type::getInt64PtrTy(Context, 0);
}
bool runOnFunction(Function &F);
Instruction *getInsertPos(BasicBlock *BB) {
if (BB == &BB->getParent()->getEntryBlock())
return &*++BB->begin();
return BB->getFirstNonPHI();
}
};
char ProfileExec::ID = 0;
INITIALIZE_PASS(ProfileExec, "profile", "Profile trace execution", false, false)
FunctionPass *llvm::createProfileExec(IRFactory *IF)
{
return new ProfileExec(IF);
}
bool ProfileExec::runOnFunction(Function &F)
{
if (!LLEnv->isTraceMode())
return false;
if (!SP->isEnabled())
return false;
Instruction *CPU = IF->getDefaultCPU(F);
if (!CPU) {
dbg() << DEBUG_PASS << PASS_NAME << ": Cannot find CPU pointer.\n";
return false;
}
TraceInfo *Trace = IF->getTrace();
for (auto FI = F.begin(), FE = F.end(); FI != FE; FI++) {
BasicBlock *BB = &*FI;
if (distance(succ_begin(BB), succ_end(BB)) != 0)
continue;
/* Find exit points and indirect branches. */
Trace->NumExit++;
if (isa<IndirectBrInst>(BB->getTerminator()))
Trace->NumIndirectBr++;
}
/* Insert code to profile trace exit counts. */
if (SP->Mode & SPM_EXIT) {
Instruction *InsertPos = &*++BasicBlock::iterator(CPU);
Value *NumExitPtr = GetElementPtrInst::CreateInBounds(CPU,
CONSTPtr(offsetof(CPUArchState, num_trace_exits)),
"", InsertPos);
NumExitPtr = new BitCastInst(NumExitPtr, Int64PtrTy, "", InsertPos);
Instruction *NumExits = new LoadInst(NumExitPtr, "", true, InsertPos);
NumExits = BinaryOperator::Create(Instruction::Add, NumExits,
CONST64(1), "", InsertPos);
new StoreInst(NumExits, NumExitPtr, true, InsertPos);
}
if (!(SP->Mode & SPM_TRACE))
return false;
SmallVector<CallInst*, 16> InlineCalls;
Function *Helper = IF->ResolveFunction("helper_profile_exec");
/* Prepare counter structures. */
if (!Trace->ExecCount) {
Trace->ExecCount = new uint64_t *[MAX_SPM_THREADS];
for (int i = 0; i < MAX_SPM_THREADS; i++)
Trace->ExecCount[i] = new uint64_t[3] {0, 0, 0};
}
/* Find all profiling point. */
std::vector<std::pair<Instruction *, int> > ProfilePoint;
SmallVector<std::pair<const BasicBlock*,const BasicBlock*>, 32> BackEdges;
FindFunctionBackedges(F, BackEdges);
for (unsigned i = 0, e = BackEdges.size(); i != e; ++i) {
auto BackEdgeBB = const_cast<BasicBlock*>(BackEdges[i].first);
ProfilePoint.push_back(std::make_pair(BackEdgeBB->getTerminator(), IDX_LOOP));
}
for (auto FI = F.begin(), FE = F.end(); FI != FE; FI++) {
BasicBlock *BB = &*FI;
if (distance(succ_begin(BB), succ_end(BB)) != 0)
continue;
bool isIndirectBr = isa<IndirectBrInst>(BB->getTerminator());
ProfilePoint.push_back(std::make_pair(getInsertPos(BB),
isIndirectBr ? IDX_INBR : IDX_EXIT));
}
/* Insert profiling routines. */
for (unsigned i = 0, e = ProfilePoint.size(); i != e; ++i) {
Instruction *InsertPos = ProfilePoint[i].first;
Value *Ty = CONST32(ProfilePoint[i].second);
Value *Counter = ConstantExpr::getIntToPtr(
CONSTPtr((uintptr_t)Trace->ExecCount),
PointerType::getUnqual(Int8Ty));
SmallVector<Value *, 4> Params;
Type *ParamTy = Helper->getFunctionType()->getParamType(0);
Value *Env = new BitCastInst(CPU, ParamTy, "", InsertPos);
Params.push_back(Env);
Params.push_back(Counter);
Params.push_back(Ty);
CallInst *CI = CallInst::Create(Helper, Params, "", InsertPos);
MF->setConst(CI);
InlineCalls.push_back(CI);
}
while (!InlineCalls.empty())
InlineFunc(InlineCalls.pop_back_val());
return true;
}
/*
* vim: ts=8 sts=4 sw=4 expandtab
*/
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