mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-21 00:32:23 +00:00
0c0de66ea4
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81450 91177308-0d34-0410-b5e6-96231b3b80d8
333 lines
10 KiB
C++
333 lines
10 KiB
C++
//===- ProfileVerifierPass.cpp - LLVM Pass to estimate profile info -------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements a pass that checks profiling information for
|
|
// plausibility.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
#define DEBUG_TYPE "profile-verifier"
|
|
#include "llvm/Instructions.h"
|
|
#include "llvm/Module.h"
|
|
#include "llvm/Pass.h"
|
|
#include "llvm/Analysis/ProfileInfo.h"
|
|
#include "llvm/Support/CommandLine.h"
|
|
#include "llvm/Support/CallSite.h"
|
|
#include "llvm/Support/CFG.h"
|
|
#include "llvm/Support/InstIterator.h"
|
|
#include "llvm/Support/raw_ostream.h"
|
|
#include "llvm/Support/Debug.h"
|
|
#include <set>
|
|
using namespace llvm;
|
|
|
|
static cl::opt<bool,false>
|
|
ProfileVerifierDisableAssertions("profile-verifier-noassert",
|
|
cl::desc("Disable assertions"));
|
|
|
|
namespace {
|
|
class VISIBILITY_HIDDEN ProfileVerifierPass : public FunctionPass {
|
|
|
|
struct DetailedBlockInfo {
|
|
const BasicBlock *BB;
|
|
double BBWeight;
|
|
double inWeight;
|
|
int inCount;
|
|
double outWeight;
|
|
int outCount;
|
|
};
|
|
|
|
ProfileInfo *PI;
|
|
std::set<const BasicBlock*> BBisVisited;
|
|
std::set<const Function*> FisVisited;
|
|
bool DisableAssertions;
|
|
|
|
// When debugging is enabled, the verifier prints a whole slew of debug
|
|
// information, otherwise its just the assert. These are all the helper
|
|
// functions.
|
|
bool PrintedDebugTree;
|
|
std::set<const BasicBlock*> BBisPrinted;
|
|
void debugEntry(DetailedBlockInfo*);
|
|
void printDebugInfo(const BasicBlock *BB);
|
|
|
|
public:
|
|
static char ID; // Class identification, replacement for typeinfo
|
|
|
|
explicit ProfileVerifierPass () : FunctionPass(&ID) {
|
|
DisableAssertions = ProfileVerifierDisableAssertions;
|
|
}
|
|
explicit ProfileVerifierPass (bool da) : FunctionPass(&ID),
|
|
DisableAssertions(da) {
|
|
}
|
|
|
|
void getAnalysisUsage(AnalysisUsage &AU) const {
|
|
AU.setPreservesAll();
|
|
AU.addRequired<ProfileInfo>();
|
|
}
|
|
|
|
const char *getPassName() const {
|
|
return "Profiling information verifier";
|
|
}
|
|
|
|
/// run - Verify the profile information.
|
|
bool runOnFunction(Function &F);
|
|
void recurseBasicBlock(const BasicBlock*);
|
|
|
|
bool exitReachable(const Function*);
|
|
double ReadOrAssert(ProfileInfo::Edge);
|
|
void CheckValue(bool, const char*, DetailedBlockInfo*);
|
|
};
|
|
} // End of anonymous namespace
|
|
|
|
char ProfileVerifierPass::ID = 0;
|
|
static RegisterPass<ProfileVerifierPass>
|
|
X("profile-verifier", "Verify profiling information", false, true);
|
|
|
|
namespace llvm {
|
|
FunctionPass *createProfileVerifierPass() {
|
|
return new ProfileVerifierPass(ProfileVerifierDisableAssertions);
|
|
}
|
|
}
|
|
|
|
void ProfileVerifierPass::printDebugInfo(const BasicBlock *BB) {
|
|
|
|
if (BBisPrinted.find(BB) != BBisPrinted.end()) return;
|
|
|
|
double BBWeight = PI->getExecutionCount(BB);
|
|
if (BBWeight == ProfileInfo::MissingValue) { BBWeight = 0; }
|
|
double inWeight = 0;
|
|
int inCount = 0;
|
|
std::set<const BasicBlock*> ProcessedPreds;
|
|
for ( pred_const_iterator bbi = pred_begin(BB), bbe = pred_end(BB);
|
|
bbi != bbe; ++bbi ) {
|
|
if (ProcessedPreds.insert(*bbi).second) {
|
|
ProfileInfo::Edge E = PI->getEdge(*bbi,BB);
|
|
double EdgeWeight = PI->getEdgeWeight(E);
|
|
if (EdgeWeight == ProfileInfo::MissingValue) { EdgeWeight = 0; }
|
|
errs() << "calculated in-edge " << E << ": " << EdgeWeight << "\n";
|
|
inWeight += EdgeWeight;
|
|
inCount++;
|
|
}
|
|
}
|
|
double outWeight = 0;
|
|
int outCount = 0;
|
|
std::set<const BasicBlock*> ProcessedSuccs;
|
|
for ( succ_const_iterator bbi = succ_begin(BB), bbe = succ_end(BB);
|
|
bbi != bbe; ++bbi ) {
|
|
if (ProcessedSuccs.insert(*bbi).second) {
|
|
ProfileInfo::Edge E = PI->getEdge(BB,*bbi);
|
|
double EdgeWeight = PI->getEdgeWeight(E);
|
|
if (EdgeWeight == ProfileInfo::MissingValue) { EdgeWeight = 0; }
|
|
errs() << "calculated out-edge " << E << ": " << EdgeWeight << "\n";
|
|
outWeight += EdgeWeight;
|
|
outCount++;
|
|
}
|
|
}
|
|
errs()<<"Block "<<BB->getNameStr()<<" in "<<BB->getParent()->getNameStr()
|
|
<<",BBWeight="<<BBWeight<<",inWeight="<<inWeight<<",inCount="<<inCount
|
|
<<",outWeight="<<outWeight<<",outCount"<<outCount<<"\n";
|
|
|
|
// mark as visited and recurse into subnodes
|
|
BBisPrinted.insert(BB);
|
|
for ( succ_const_iterator bbi = succ_begin(BB), bbe = succ_end(BB);
|
|
bbi != bbe; ++bbi ) {
|
|
printDebugInfo(*bbi);
|
|
}
|
|
}
|
|
|
|
void ProfileVerifierPass::debugEntry (DetailedBlockInfo *DI) {
|
|
errs() << "TROUBLE: Block " << DI->BB->getNameStr() << " in "
|
|
<< DI->BB->getParent()->getNameStr() << ":";
|
|
errs() << "BBWeight=" << DI->BBWeight << ",";
|
|
errs() << "inWeight=" << DI->inWeight << ",";
|
|
errs() << "inCount=" << DI->inCount << ",";
|
|
errs() << "outWeight=" << DI->outWeight << ",";
|
|
errs() << "outCount=" << DI->outCount << "\n";
|
|
if (!PrintedDebugTree) {
|
|
PrintedDebugTree = true;
|
|
printDebugInfo(&(DI->BB->getParent()->getEntryBlock()));
|
|
}
|
|
}
|
|
|
|
// compare with relative error
|
|
static bool Equals(double A, double B) {
|
|
double maxRelativeError = 0.0000001;
|
|
if (A == B)
|
|
return true;
|
|
double relativeError;
|
|
if (fabs(B) > fabs(A))
|
|
relativeError = fabs((A - B) / B);
|
|
else
|
|
relativeError = fabs((A - B) / A);
|
|
if (relativeError <= maxRelativeError) return true;
|
|
return false;
|
|
}
|
|
|
|
bool ProfileVerifierPass::exitReachable(const Function *F) {
|
|
if (!F) return false;
|
|
|
|
if (FisVisited.count(F)) return false;
|
|
|
|
Function *Exit = F->getParent()->getFunction("exit");
|
|
if (Exit == F) {
|
|
return true;
|
|
}
|
|
|
|
FisVisited.insert(F);
|
|
bool exits = false;
|
|
for (const_inst_iterator I = inst_begin(F), E = inst_end(F); I != E; ++I) {
|
|
if (const CallInst *CI = dyn_cast<CallInst>(&*I)) {
|
|
exits |= exitReachable(CI->getCalledFunction());
|
|
if (exits) break;
|
|
}
|
|
}
|
|
return exits;
|
|
}
|
|
|
|
#define ASSERTMESSAGE(M) \
|
|
errs() << (M) << "\n"; \
|
|
if (!DisableAssertions) assert(0 && (M));
|
|
|
|
double ProfileVerifierPass::ReadOrAssert(ProfileInfo::Edge E) {
|
|
double EdgeWeight = PI->getEdgeWeight(E);
|
|
if (EdgeWeight == ProfileInfo::MissingValue) {
|
|
errs() << "Edge " << E << " in Function "
|
|
<< E.first->getParent()->getNameStr() << ": ";
|
|
ASSERTMESSAGE("ASSERT:Edge has missing value");
|
|
return 0;
|
|
} else {
|
|
return EdgeWeight;
|
|
}
|
|
}
|
|
|
|
void ProfileVerifierPass::CheckValue(bool Error, const char *Message,
|
|
DetailedBlockInfo *DI) {
|
|
if (Error) {
|
|
DEBUG(debugEntry(DI));
|
|
errs() << "Block " << DI->BB->getNameStr() << " in Function "
|
|
<< DI->BB->getParent()->getNameStr() << ": ";
|
|
ASSERTMESSAGE(Message);
|
|
}
|
|
return;
|
|
}
|
|
|
|
void ProfileVerifierPass::recurseBasicBlock(const BasicBlock *BB) {
|
|
|
|
if (BBisVisited.find(BB) != BBisVisited.end()) return;
|
|
|
|
DetailedBlockInfo DI;
|
|
DI.BB = BB;
|
|
DI.outCount = DI.inCount = DI.inWeight = DI.outWeight = 0;
|
|
std::set<const BasicBlock*> ProcessedPreds;
|
|
pred_const_iterator bpi = pred_begin(BB), bpe = pred_end(BB);
|
|
if (bpi == bpe) {
|
|
DI.inWeight += ReadOrAssert(PI->getEdge(0,BB));
|
|
DI.inCount++;
|
|
}
|
|
for (;bpi != bpe; ++bpi) {
|
|
if (ProcessedPreds.insert(*bpi).second) {
|
|
DI.inWeight += ReadOrAssert(PI->getEdge(*bpi,BB));
|
|
DI.inCount++;
|
|
}
|
|
}
|
|
|
|
std::set<const BasicBlock*> ProcessedSuccs;
|
|
succ_const_iterator bbi = succ_begin(BB), bbe = succ_end(BB);
|
|
if (bbi == bbe) {
|
|
double w = PI->getEdgeWeight(PI->getEdge(BB,0));
|
|
if (w != ProfileInfo::MissingValue) {
|
|
DI.outWeight += w;
|
|
DI.outCount++;
|
|
}
|
|
}
|
|
for (;bbi != bbe; ++bbi) {
|
|
if (ProcessedSuccs.insert(*bbi).second) {
|
|
DI.outWeight += ReadOrAssert(PI->getEdge(BB,*bbi));
|
|
DI.outCount++;
|
|
}
|
|
}
|
|
|
|
DI.BBWeight = PI->getExecutionCount(BB);
|
|
CheckValue(DI.BBWeight == ProfileInfo::MissingValue,
|
|
"ASSERT:BasicBlock has missing value", &DI);
|
|
|
|
// Check if this block is a setjmp target.
|
|
bool isSetJmpTarget = false;
|
|
if (DI.outWeight > DI.inWeight) {
|
|
for (BasicBlock::const_iterator i = BB->begin(), ie = BB->end();
|
|
i != ie; ++i) {
|
|
if (const CallInst *CI = dyn_cast<CallInst>(&*i)) {
|
|
Function *F = CI->getCalledFunction();
|
|
if (F && (F->getNameStr() == "_setjmp")) {
|
|
isSetJmpTarget = true; break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
// Check if this block is eventually reaching exit.
|
|
bool isExitReachable = false;
|
|
if (DI.inWeight > DI.outWeight) {
|
|
for (BasicBlock::const_iterator i = BB->begin(), ie = BB->end();
|
|
i != ie; ++i) {
|
|
if (const CallInst *CI = dyn_cast<CallInst>(&*i)) {
|
|
FisVisited.clear();
|
|
isExitReachable |= exitReachable(CI->getCalledFunction());
|
|
if (isExitReachable) break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (DI.inCount > 0 && DI.outCount == 0) {
|
|
// If this is a block with no successors.
|
|
if (!isSetJmpTarget) {
|
|
CheckValue(!Equals(DI.inWeight,DI.BBWeight),
|
|
"ASSERT:inWeight and BBWeight do not match", &DI);
|
|
}
|
|
} else if (DI.inCount == 0 && DI.outCount > 0) {
|
|
// If this is a block with no predecessors.
|
|
if (!isExitReachable)
|
|
CheckValue(!Equals(DI.BBWeight,DI.outWeight),
|
|
"ASSERT:BBWeight and outWeight do not match", &DI);
|
|
} else {
|
|
// If this block has successors and predecessors.
|
|
if (DI.inWeight > DI.outWeight && !isExitReachable)
|
|
CheckValue(!Equals(DI.inWeight,DI.outWeight),
|
|
"ASSERT:inWeight and outWeight do not match", &DI);
|
|
if (DI.inWeight < DI.outWeight && !isSetJmpTarget)
|
|
CheckValue(!Equals(DI.inWeight,DI.outWeight),
|
|
"ASSERT:inWeight and outWeight do not match", &DI);
|
|
}
|
|
|
|
|
|
// mark as visited and recurse into subnodes
|
|
BBisVisited.insert(BB);
|
|
for ( succ_const_iterator bbi = succ_begin(BB), bbe = succ_end(BB);
|
|
bbi != bbe; ++bbi ) {
|
|
recurseBasicBlock(*bbi);
|
|
}
|
|
}
|
|
|
|
bool ProfileVerifierPass::runOnFunction(Function &F) {
|
|
PI = &getAnalysis<ProfileInfo>();
|
|
|
|
if (PI->getExecutionCount(&F) == ProfileInfo::MissingValue) {
|
|
DEBUG(errs() << "Function " << F.getNameStr() << " has no profile\n");
|
|
return false;
|
|
}
|
|
|
|
PrintedDebugTree = false;
|
|
BBisVisited.clear();
|
|
|
|
const BasicBlock *entry = &F.getEntryBlock();
|
|
recurseBasicBlock(entry);
|
|
|
|
if (!DisableAssertions)
|
|
assert((PI->getExecutionCount(&F)==PI->getExecutionCount(entry)) &&
|
|
"Function count and entry block count do not match");
|
|
return false;
|
|
}
|