mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-11-01 15:11:24 +00:00
0861f5793a
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145154 91177308-0d34-0410-b5e6-96231b3b80d8
383 lines
13 KiB
C++
383 lines
13 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/Format.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 {
|
|
template<class FType, class BType>
|
|
class ProfileVerifierPassT : public FunctionPass {
|
|
|
|
struct DetailedBlockInfo {
|
|
const BType *BB;
|
|
double BBWeight;
|
|
double inWeight;
|
|
int inCount;
|
|
double outWeight;
|
|
int outCount;
|
|
};
|
|
|
|
ProfileInfoT<FType, BType> *PI;
|
|
std::set<const BType*> BBisVisited;
|
|
std::set<const FType*> 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 BType*> BBisPrinted;
|
|
void debugEntry(DetailedBlockInfo*);
|
|
void printDebugInfo(const BType *BB);
|
|
|
|
public:
|
|
static char ID; // Class identification, replacement for typeinfo
|
|
|
|
explicit ProfileVerifierPassT () : FunctionPass(ID) {
|
|
initializeProfileVerifierPassPass(*PassRegistry::getPassRegistry());
|
|
DisableAssertions = ProfileVerifierDisableAssertions;
|
|
}
|
|
explicit ProfileVerifierPassT (bool da) : FunctionPass(ID),
|
|
DisableAssertions(da) {
|
|
initializeProfileVerifierPassPass(*PassRegistry::getPassRegistry());
|
|
}
|
|
|
|
void getAnalysisUsage(AnalysisUsage &AU) const {
|
|
AU.setPreservesAll();
|
|
AU.addRequired<ProfileInfoT<FType, BType> >();
|
|
}
|
|
|
|
const char *getPassName() const {
|
|
return "Profiling information verifier";
|
|
}
|
|
|
|
/// run - Verify the profile information.
|
|
bool runOnFunction(FType &F);
|
|
void recurseBasicBlock(const BType*);
|
|
|
|
bool exitReachable(const FType*);
|
|
double ReadOrAssert(typename ProfileInfoT<FType, BType>::Edge);
|
|
void CheckValue(bool, const char*, DetailedBlockInfo*);
|
|
};
|
|
|
|
typedef ProfileVerifierPassT<Function, BasicBlock> ProfileVerifierPass;
|
|
|
|
template<class FType, class BType>
|
|
void ProfileVerifierPassT<FType, BType>::printDebugInfo(const BType *BB) {
|
|
|
|
if (BBisPrinted.find(BB) != BBisPrinted.end()) return;
|
|
|
|
double BBWeight = PI->getExecutionCount(BB);
|
|
if (BBWeight == ProfileInfoT<FType, BType>::MissingValue) { BBWeight = 0; }
|
|
double inWeight = 0;
|
|
int inCount = 0;
|
|
std::set<const BType*> ProcessedPreds;
|
|
for (const_pred_iterator bbi = pred_begin(BB), bbe = pred_end(BB);
|
|
bbi != bbe; ++bbi ) {
|
|
if (ProcessedPreds.insert(*bbi).second) {
|
|
typename ProfileInfoT<FType, BType>::Edge E = PI->getEdge(*bbi,BB);
|
|
double EdgeWeight = PI->getEdgeWeight(E);
|
|
if (EdgeWeight == ProfileInfoT<FType, BType>::MissingValue) { EdgeWeight = 0; }
|
|
dbgs() << "calculated in-edge " << E << ": "
|
|
<< format("%20.20g",EdgeWeight) << "\n";
|
|
inWeight += EdgeWeight;
|
|
inCount++;
|
|
}
|
|
}
|
|
double outWeight = 0;
|
|
int outCount = 0;
|
|
std::set<const BType*> ProcessedSuccs;
|
|
for ( succ_const_iterator bbi = succ_begin(BB), bbe = succ_end(BB);
|
|
bbi != bbe; ++bbi ) {
|
|
if (ProcessedSuccs.insert(*bbi).second) {
|
|
typename ProfileInfoT<FType, BType>::Edge E = PI->getEdge(BB,*bbi);
|
|
double EdgeWeight = PI->getEdgeWeight(E);
|
|
if (EdgeWeight == ProfileInfoT<FType, BType>::MissingValue) { EdgeWeight = 0; }
|
|
dbgs() << "calculated out-edge " << E << ": "
|
|
<< format("%20.20g",EdgeWeight) << "\n";
|
|
outWeight += EdgeWeight;
|
|
outCount++;
|
|
}
|
|
}
|
|
dbgs() << "Block " << BB->getName() << " in "
|
|
<< BB->getParent()->getName() << ":"
|
|
<< "BBWeight=" << format("%20.20g",BBWeight) << ","
|
|
<< "inWeight=" << format("%20.20g",inWeight) << ","
|
|
<< "inCount=" << inCount << ","
|
|
<< "outWeight=" << format("%20.20g",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);
|
|
}
|
|
}
|
|
|
|
template<class FType, class BType>
|
|
void ProfileVerifierPassT<FType, BType>::debugEntry (DetailedBlockInfo *DI) {
|
|
dbgs() << "TROUBLE: Block " << DI->BB->getName() << " in "
|
|
<< DI->BB->getParent()->getName() << ":"
|
|
<< "BBWeight=" << format("%20.20g",DI->BBWeight) << ","
|
|
<< "inWeight=" << format("%20.20g",DI->inWeight) << ","
|
|
<< "inCount=" << DI->inCount << ","
|
|
<< "outWeight=" << format("%20.20g",DI->outWeight) << ","
|
|
<< "outCount=" << DI->outCount << "\n";
|
|
if (!PrintedDebugTree) {
|
|
PrintedDebugTree = true;
|
|
printDebugInfo(&(DI->BB->getParent()->getEntryBlock()));
|
|
}
|
|
}
|
|
|
|
// This compares A and B for equality.
|
|
static bool Equals(double A, double B) {
|
|
return A == B;
|
|
}
|
|
|
|
// This checks if the function "exit" is reachable from an given function
|
|
// via calls, this is necessary to check if a profile is valid despite the
|
|
// counts not fitting exactly.
|
|
template<class FType, class BType>
|
|
bool ProfileVerifierPassT<FType, BType>::exitReachable(const FType *F) {
|
|
if (!F) return false;
|
|
|
|
if (FisVisited.count(F)) return false;
|
|
|
|
FType *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)) {
|
|
FType *F = CI->getCalledFunction();
|
|
if (F) {
|
|
exits |= exitReachable(F);
|
|
} else {
|
|
// This is a call to a pointer, all bets are off...
|
|
exits = true;
|
|
}
|
|
if (exits) break;
|
|
}
|
|
}
|
|
return exits;
|
|
}
|
|
|
|
#define ASSERTMESSAGE(M) \
|
|
{ dbgs() << "ASSERT:" << (M) << "\n"; \
|
|
if (!DisableAssertions) assert(0 && (M)); }
|
|
|
|
template<class FType, class BType>
|
|
double ProfileVerifierPassT<FType, BType>::ReadOrAssert(typename ProfileInfoT<FType, BType>::Edge E) {
|
|
double EdgeWeight = PI->getEdgeWeight(E);
|
|
if (EdgeWeight == ProfileInfoT<FType, BType>::MissingValue) {
|
|
dbgs() << "Edge " << E << " in Function "
|
|
<< ProfileInfoT<FType, BType>::getFunction(E)->getName() << ": ";
|
|
ASSERTMESSAGE("Edge has missing value");
|
|
return 0;
|
|
} else {
|
|
if (EdgeWeight < 0) {
|
|
dbgs() << "Edge " << E << " in Function "
|
|
<< ProfileInfoT<FType, BType>::getFunction(E)->getName() << ": ";
|
|
ASSERTMESSAGE("Edge has negative value");
|
|
}
|
|
return EdgeWeight;
|
|
}
|
|
}
|
|
|
|
template<class FType, class BType>
|
|
void ProfileVerifierPassT<FType, BType>::CheckValue(bool Error,
|
|
const char *Message,
|
|
DetailedBlockInfo *DI) {
|
|
if (Error) {
|
|
DEBUG(debugEntry(DI));
|
|
dbgs() << "Block " << DI->BB->getName() << " in Function "
|
|
<< DI->BB->getParent()->getName() << ": ";
|
|
ASSERTMESSAGE(Message);
|
|
}
|
|
return;
|
|
}
|
|
|
|
// This calculates the Information for a block and then recurses into the
|
|
// successors.
|
|
template<class FType, class BType>
|
|
void ProfileVerifierPassT<FType, BType>::recurseBasicBlock(const BType *BB) {
|
|
|
|
// Break the recursion by remembering all visited blocks.
|
|
if (BBisVisited.find(BB) != BBisVisited.end()) return;
|
|
|
|
// Use a data structure to store all the information, this can then be handed
|
|
// to debug printers.
|
|
DetailedBlockInfo DI;
|
|
DI.BB = BB;
|
|
DI.outCount = DI.inCount = 0;
|
|
DI.inWeight = DI.outWeight = 0;
|
|
|
|
// Read predecessors.
|
|
std::set<const BType*> ProcessedPreds;
|
|
const_pred_iterator bpi = pred_begin(BB), bpe = pred_end(BB);
|
|
// If there are none, check for (0,BB) edge.
|
|
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++;
|
|
}
|
|
}
|
|
|
|
// Read successors.
|
|
std::set<const BType*> ProcessedSuccs;
|
|
succ_const_iterator bbi = succ_begin(BB), bbe = succ_end(BB);
|
|
// If there is an (0,BB) edge, consider it too. (This is done not only when
|
|
// there are no successors, but every time; not every function contains
|
|
// return blocks with no successors (think loop latch as return block)).
|
|
double w = PI->getEdgeWeight(PI->getEdge(BB,0));
|
|
if (w != ProfileInfoT<FType, BType>::MissingValue) {
|
|
DI.outWeight += w;
|
|
DI.outCount++;
|
|
}
|
|
for (;bbi != bbe; ++bbi) {
|
|
if (ProcessedSuccs.insert(*bbi).second) {
|
|
DI.outWeight += ReadOrAssert(PI->getEdge(BB,*bbi));
|
|
DI.outCount++;
|
|
}
|
|
}
|
|
|
|
// Read block weight.
|
|
DI.BBWeight = PI->getExecutionCount(BB);
|
|
CheckValue(DI.BBWeight == ProfileInfoT<FType, BType>::MissingValue,
|
|
"BasicBlock has missing value", &DI);
|
|
CheckValue(DI.BBWeight < 0,
|
|
"BasicBlock has negative value", &DI);
|
|
|
|
// Check if this block is a setjmp target.
|
|
bool isSetJmpTarget = false;
|
|
if (DI.outWeight > DI.inWeight) {
|
|
for (typename BType::const_iterator i = BB->begin(), ie = BB->end();
|
|
i != ie; ++i) {
|
|
if (const CallInst *CI = dyn_cast<CallInst>(&*i)) {
|
|
FType *F = CI->getCalledFunction();
|
|
if (F && (F->getName() == "_setjmp")) {
|
|
isSetJmpTarget = true; break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
// Check if this block is eventually reaching exit.
|
|
bool isExitReachable = false;
|
|
if (DI.inWeight > DI.outWeight) {
|
|
for (typename BType::const_iterator i = BB->begin(), ie = BB->end();
|
|
i != ie; ++i) {
|
|
if (const CallInst *CI = dyn_cast<CallInst>(&*i)) {
|
|
FType *F = CI->getCalledFunction();
|
|
if (F) {
|
|
FisVisited.clear();
|
|
isExitReachable |= exitReachable(F);
|
|
} else {
|
|
// This is a call to a pointer, all bets are off...
|
|
isExitReachable = true;
|
|
}
|
|
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),
|
|
"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),
|
|
"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),
|
|
"inWeight and outWeight do not match", &DI);
|
|
if (DI.inWeight < DI.outWeight && !isSetJmpTarget)
|
|
CheckValue(!Equals(DI.inWeight,DI.outWeight),
|
|
"inWeight and outWeight do not match", &DI);
|
|
}
|
|
|
|
|
|
// Mark this block as visited, rescurse into successors.
|
|
BBisVisited.insert(BB);
|
|
for ( succ_const_iterator bbi = succ_begin(BB), bbe = succ_end(BB);
|
|
bbi != bbe; ++bbi ) {
|
|
recurseBasicBlock(*bbi);
|
|
}
|
|
}
|
|
|
|
template<class FType, class BType>
|
|
bool ProfileVerifierPassT<FType, BType>::runOnFunction(FType &F) {
|
|
PI = getAnalysisIfAvailable<ProfileInfoT<FType, BType> >();
|
|
if (!PI)
|
|
ASSERTMESSAGE("No ProfileInfo available");
|
|
|
|
// Prepare global variables.
|
|
PrintedDebugTree = false;
|
|
BBisVisited.clear();
|
|
|
|
// Fetch entry block and recurse into it.
|
|
const BType *entry = &F.getEntryBlock();
|
|
recurseBasicBlock(entry);
|
|
|
|
if (PI->getExecutionCount(&F) != PI->getExecutionCount(entry))
|
|
ASSERTMESSAGE("Function count and entry block count do not match");
|
|
|
|
return false;
|
|
}
|
|
|
|
template<class FType, class BType>
|
|
char ProfileVerifierPassT<FType, BType>::ID = 0;
|
|
}
|
|
|
|
INITIALIZE_PASS_BEGIN(ProfileVerifierPass, "profile-verifier",
|
|
"Verify profiling information", false, true)
|
|
INITIALIZE_AG_DEPENDENCY(ProfileInfo)
|
|
INITIALIZE_PASS_END(ProfileVerifierPass, "profile-verifier",
|
|
"Verify profiling information", false, true)
|
|
|
|
namespace llvm {
|
|
FunctionPass *createProfileVerifierPass() {
|
|
return new ProfileVerifierPass(ProfileVerifierDisableAssertions);
|
|
}
|
|
}
|
|
|