277 lines
9.4 KiB
C++
277 lines
9.4 KiB
C++
//===- ProfileInfoLoad.cpp - Load profile information from disk -----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// The ProfileInfoLoader class is used to load and represent profiling
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// information read in from the dump file.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/ProfileInfoLoader.h"
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#include "llvm/Analysis/ProfileInfoTypes.h"
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#include "llvm/Module.h"
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#include "llvm/InstrTypes.h"
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#include "llvm/Support/Streams.h"
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#include <cstdio>
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#include <map>
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using namespace llvm;
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// ByteSwap - Byteswap 'Var' if 'Really' is true.
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//
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static inline unsigned ByteSwap(unsigned Var, bool Really) {
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if (!Really) return Var;
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return ((Var & (255<< 0)) << 24) |
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((Var & (255<< 8)) << 8) |
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((Var & (255<<16)) >> 8) |
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((Var & (255<<24)) >> 24);
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}
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static void ReadProfilingBlock(const char *ToolName, FILE *F,
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bool ShouldByteSwap,
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std::vector<unsigned> &Data) {
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// Read the number of entries...
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unsigned NumEntries;
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if (fread(&NumEntries, sizeof(unsigned), 1, F) != 1) {
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cerr << ToolName << ": data packet truncated!\n";
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perror(0);
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exit(1);
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}
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NumEntries = ByteSwap(NumEntries, ShouldByteSwap);
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// Read the counts...
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std::vector<unsigned> TempSpace(NumEntries);
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// Read in the block of data...
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if (fread(&TempSpace[0], sizeof(unsigned)*NumEntries, 1, F) != 1) {
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cerr << ToolName << ": data packet truncated!\n";
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perror(0);
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exit(1);
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}
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// Make sure we have enough space...
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if (Data.size() < NumEntries)
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Data.resize(NumEntries);
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// Accumulate the data we just read into the data.
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if (!ShouldByteSwap) {
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for (unsigned i = 0; i != NumEntries; ++i)
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Data[i] += TempSpace[i];
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} else {
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for (unsigned i = 0; i != NumEntries; ++i)
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Data[i] += ByteSwap(TempSpace[i], true);
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}
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}
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// ProfileInfoLoader ctor - Read the specified profiling data file, exiting the
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// program if the file is invalid or broken.
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//
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ProfileInfoLoader::ProfileInfoLoader(const char *ToolName,
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const std::string &Filename,
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Module &TheModule) : M(TheModule) {
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FILE *F = fopen(Filename.c_str(), "r");
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if (F == 0) {
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cerr << ToolName << ": Error opening '" << Filename << "': ";
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perror(0);
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exit(1);
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}
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// Keep reading packets until we run out of them.
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unsigned PacketType;
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while (fread(&PacketType, sizeof(unsigned), 1, F) == 1) {
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// If the low eight bits of the packet are zero, we must be dealing with an
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// endianness mismatch. Byteswap all words read from the profiling
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// information.
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bool ShouldByteSwap = (char)PacketType == 0;
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PacketType = ByteSwap(PacketType, ShouldByteSwap);
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switch (PacketType) {
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case ArgumentInfo: {
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unsigned ArgLength;
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if (fread(&ArgLength, sizeof(unsigned), 1, F) != 1) {
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cerr << ToolName << ": arguments packet truncated!\n";
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perror(0);
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exit(1);
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}
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ArgLength = ByteSwap(ArgLength, ShouldByteSwap);
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// Read in the arguments...
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std::vector<char> Chars(ArgLength+4);
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if (ArgLength)
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if (fread(&Chars[0], (ArgLength+3) & ~3, 1, F) != 1) {
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cerr << ToolName << ": arguments packet truncated!\n";
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perror(0);
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exit(1);
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}
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CommandLines.push_back(std::string(&Chars[0], &Chars[ArgLength]));
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break;
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}
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case FunctionInfo:
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ReadProfilingBlock(ToolName, F, ShouldByteSwap, FunctionCounts);
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break;
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case BlockInfo:
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ReadProfilingBlock(ToolName, F, ShouldByteSwap, BlockCounts);
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break;
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case EdgeInfo:
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ReadProfilingBlock(ToolName, F, ShouldByteSwap, EdgeCounts);
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break;
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case BBTraceInfo:
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ReadProfilingBlock(ToolName, F, ShouldByteSwap, BBTrace);
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break;
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default:
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cerr << ToolName << ": Unknown packet type #" << PacketType << "!\n";
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exit(1);
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}
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}
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fclose(F);
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}
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// getFunctionCounts - This method is used by consumers of function counting
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// information. If we do not directly have function count information, we
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// compute it from other, more refined, types of profile information.
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//
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void ProfileInfoLoader::getFunctionCounts(std::vector<std::pair<Function*,
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unsigned> > &Counts) {
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if (FunctionCounts.empty()) {
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if (hasAccurateBlockCounts()) {
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// Synthesize function frequency information from the number of times
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// their entry blocks were executed.
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std::vector<std::pair<BasicBlock*, unsigned> > BlockCounts;
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getBlockCounts(BlockCounts);
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for (unsigned i = 0, e = BlockCounts.size(); i != e; ++i)
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if (&BlockCounts[i].first->getParent()->getEntryBlock() ==
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BlockCounts[i].first)
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Counts.push_back(std::make_pair(BlockCounts[i].first->getParent(),
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BlockCounts[i].second));
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} else {
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cerr << "Function counts are not available!\n";
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}
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return;
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}
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unsigned Counter = 0;
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for (Module::iterator I = M.begin(), E = M.end();
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I != E && Counter != FunctionCounts.size(); ++I)
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if (!I->isDeclaration())
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Counts.push_back(std::make_pair(I, FunctionCounts[Counter++]));
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}
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// getBlockCounts - This method is used by consumers of block counting
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// information. If we do not directly have block count information, we
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// compute it from other, more refined, types of profile information.
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//
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void ProfileInfoLoader::getBlockCounts(std::vector<std::pair<BasicBlock*,
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unsigned> > &Counts) {
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if (BlockCounts.empty()) {
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if (hasAccurateEdgeCounts()) {
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// Synthesize block count information from edge frequency information.
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// The block execution frequency is equal to the sum of the execution
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// frequency of all outgoing edges from a block.
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//
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// If a block has no successors, this will not be correct, so we have to
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// special case it. :(
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std::vector<std::pair<Edge, unsigned> > EdgeCounts;
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getEdgeCounts(EdgeCounts);
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std::map<BasicBlock*, unsigned> InEdgeFreqs;
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BasicBlock *LastBlock = 0;
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TerminatorInst *TI = 0;
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for (unsigned i = 0, e = EdgeCounts.size(); i != e; ++i) {
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if (EdgeCounts[i].first.first != LastBlock) {
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LastBlock = EdgeCounts[i].first.first;
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TI = LastBlock->getTerminator();
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Counts.push_back(std::make_pair(LastBlock, 0));
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}
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Counts.back().second += EdgeCounts[i].second;
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unsigned SuccNum = EdgeCounts[i].first.second;
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if (SuccNum >= TI->getNumSuccessors()) {
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static bool Warned = false;
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if (!Warned) {
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cerr << "WARNING: profile info doesn't seem to match"
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<< " the program!\n";
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Warned = true;
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}
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} else {
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// If this successor has no successors of its own, we will never
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// compute an execution count for that block. Remember the incoming
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// edge frequencies to add later.
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BasicBlock *Succ = TI->getSuccessor(SuccNum);
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if (Succ->getTerminator()->getNumSuccessors() == 0)
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InEdgeFreqs[Succ] += EdgeCounts[i].second;
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}
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}
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// Now we have to accumulate information for those blocks without
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// successors into our table.
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for (std::map<BasicBlock*, unsigned>::iterator I = InEdgeFreqs.begin(),
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E = InEdgeFreqs.end(); I != E; ++I) {
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unsigned i = 0;
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for (; i != Counts.size() && Counts[i].first != I->first; ++i)
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/*empty*/;
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if (i == Counts.size()) Counts.push_back(std::make_pair(I->first, 0));
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Counts[i].second += I->second;
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}
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} else {
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cerr << "Block counts are not available!\n";
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}
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return;
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}
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unsigned Counter = 0;
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for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F)
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for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) {
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Counts.push_back(std::make_pair(BB, BlockCounts[Counter++]));
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if (Counter == BlockCounts.size())
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return;
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}
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}
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// getEdgeCounts - This method is used by consumers of edge counting
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// information. If we do not directly have edge count information, we compute
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// it from other, more refined, types of profile information.
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//
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void ProfileInfoLoader::getEdgeCounts(std::vector<std::pair<Edge,
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unsigned> > &Counts) {
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if (EdgeCounts.empty()) {
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cerr << "Edge counts not available, and no synthesis "
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<< "is implemented yet!\n";
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return;
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}
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unsigned Counter = 0;
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for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F)
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for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB)
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for (unsigned i = 0, e = BB->getTerminator()->getNumSuccessors();
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i != e; ++i) {
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Counts.push_back(std::make_pair(Edge(BB, i), EdgeCounts[Counter++]));
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if (Counter == EdgeCounts.size())
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return;
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}
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}
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// getBBTrace - This method is used by consumers of basic-block trace
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// information.
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//
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void ProfileInfoLoader::getBBTrace(std::vector<BasicBlock *> &Trace) {
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if (BBTrace.empty ()) {
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cerr << "Basic block trace is not available!\n";
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return;
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}
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cerr << "Basic block trace loading is not implemented yet!\n";
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}
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