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https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130068 91177308-0d34-0410-b5e6-96231b3b80d8
158 lines
4.8 KiB
C++
158 lines
4.8 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/raw_ostream.h"
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#include <cstdio>
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#include <cstdlib>
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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 & (255U<< 0U)) << 24U) |
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((Var & (255U<< 8U)) << 8U) |
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((Var & (255U<<16U)) >> 8U) |
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((Var & (255U<<24U)) >> 24U);
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}
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static unsigned AddCounts(unsigned A, unsigned B) {
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// If either value is undefined, use the other.
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if (A == ProfileInfoLoader::Uncounted) return B;
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if (B == ProfileInfoLoader::Uncounted) return A;
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return A + B;
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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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errs() << 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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errs() << 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... The space is initialised to -1 to
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// facitiltate the loading of missing values for OptimalEdgeProfiling.
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if (Data.size() < NumEntries)
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Data.resize(NumEntries, ProfileInfoLoader::Uncounted);
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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] = AddCounts(TempSpace[i], Data[i]);
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}
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} else {
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for (unsigned i = 0; i != NumEntries; ++i) {
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Data[i] = AddCounts(ByteSwap(TempSpace[i], true), Data[i]);
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}
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}
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}
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const unsigned ProfileInfoLoader::Uncounted = ~0U;
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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) :
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Filename(Filename),
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M(TheModule), Warned(false) {
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FILE *F = fopen(Filename.c_str(), "rb");
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if (F == 0) {
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errs() << 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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errs() << 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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errs() << 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 OptEdgeInfo:
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ReadProfilingBlock(ToolName, F, ShouldByteSwap, OptimalEdgeCounts);
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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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errs() << 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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