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//===- ProfileInfoLoad.cpp - Load profile information from disk -----------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// The ProfileInfoLoader class is used to load and represent profiling
// information read in from the dump file.
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/ProfileInfoLoader.h"
#include "llvm/Analysis/ProfileInfoTypes.h"
#include "llvm/IR/InstrTypes.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/raw_ostream.h"
#include <cstdio>
#include <cstdlib>
using namespace llvm;
// ByteSwap - Byteswap 'Var' if 'Really' is true.
//
static inline unsigned ByteSwap(unsigned Var, bool Really) {
if (!Really) return Var;
return ((Var & (255U<< 0U)) << 24U) |
((Var & (255U<< 8U)) << 8U) |
((Var & (255U<<16U)) >> 8U) |
((Var & (255U<<24U)) >> 24U);
}
static unsigned AddCounts(unsigned A, unsigned B) {
// If either value is undefined, use the other.
if (A == ProfileInfoLoader::Uncounted) return B;
if (B == ProfileInfoLoader::Uncounted) return A;
return A + B;
}
static void ReadProfilingBlock(const char *ToolName, FILE *F,
bool ShouldByteSwap,
std::vector<unsigned> &Data) {
// Read the number of entries...
unsigned NumEntries;
if (fread(&NumEntries, sizeof(unsigned), 1, F) != 1) {
errs() << ToolName << ": data packet truncated!\n";
perror(0);
exit(1);
}
NumEntries = ByteSwap(NumEntries, ShouldByteSwap);
// Read the counts...
std::vector<unsigned> TempSpace(NumEntries);
// Read in the block of data...
if (fread(&TempSpace[0], sizeof(unsigned)*NumEntries, 1, F) != 1) {
errs() << ToolName << ": data packet truncated!\n";
perror(0);
exit(1);
}
// Make sure we have enough space... The space is initialised to -1 to
// facitiltate the loading of missing values for OptimalEdgeProfiling.
if (Data.size() < NumEntries)
Data.resize(NumEntries, ProfileInfoLoader::Uncounted);
// Accumulate the data we just read into the data.
if (!ShouldByteSwap) {
for (unsigned i = 0; i != NumEntries; ++i) {
Data[i] = AddCounts(TempSpace[i], Data[i]);
}
} else {
for (unsigned i = 0; i != NumEntries; ++i) {
Data[i] = AddCounts(ByteSwap(TempSpace[i], true), Data[i]);
}
}
}
const unsigned ProfileInfoLoader::Uncounted = ~0U;
// ProfileInfoLoader ctor - Read the specified profiling data file, exiting the
// program if the file is invalid or broken.
//
ProfileInfoLoader::ProfileInfoLoader(const char *ToolName,
const std::string &Filename)
: Filename(Filename) {
FILE *F = fopen(Filename.c_str(), "rb");
if (F == 0) {
errs() << ToolName << ": Error opening '" << Filename << "': ";
perror(0);
exit(1);
}
// Keep reading packets until we run out of them.
unsigned PacketType;
while (fread(&PacketType, sizeof(unsigned), 1, F) == 1) {
// If the low eight bits of the packet are zero, we must be dealing with an
// endianness mismatch. Byteswap all words read from the profiling
// information.
bool ShouldByteSwap = (char)PacketType == 0;
PacketType = ByteSwap(PacketType, ShouldByteSwap);
switch (PacketType) {
case ArgumentInfo: {
unsigned ArgLength;
if (fread(&ArgLength, sizeof(unsigned), 1, F) != 1) {
errs() << ToolName << ": arguments packet truncated!\n";
perror(0);
exit(1);
}
ArgLength = ByteSwap(ArgLength, ShouldByteSwap);
// Read in the arguments...
std::vector<char> Chars(ArgLength+4);
if (ArgLength)
if (fread(&Chars[0], (ArgLength+3) & ~3, 1, F) != 1) {
errs() << ToolName << ": arguments packet truncated!\n";
perror(0);
exit(1);
}
CommandLines.push_back(std::string(&Chars[0], &Chars[ArgLength]));
break;
}
case FunctionInfo:
ReadProfilingBlock(ToolName, F, ShouldByteSwap, FunctionCounts);
break;
case BlockInfo:
ReadProfilingBlock(ToolName, F, ShouldByteSwap, BlockCounts);
break;
case EdgeInfo:
ReadProfilingBlock(ToolName, F, ShouldByteSwap, EdgeCounts);
break;
case OptEdgeInfo:
ReadProfilingBlock(ToolName, F, ShouldByteSwap, OptimalEdgeCounts);
break;
case BBTraceInfo:
ReadProfilingBlock(ToolName, F, ShouldByteSwap, BBTrace);
break;
default:
errs() << ToolName << ": Unknown packet type #" << PacketType << "!\n";
exit(1);
}
}
fclose(F);
}
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