1//===- ProfileInfoLoad.cpp - Load profile information from disk -----------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// The ProfileInfoLoader class is used to load and represent profiling 11// information read in from the dump file. 12// 13//===----------------------------------------------------------------------===// 14 15#include "llvm/Analysis/ProfileInfoLoader.h" 16#include "llvm/Analysis/ProfileInfoTypes.h" 17#include "llvm/IR/InstrTypes.h" 18#include "llvm/IR/Module.h" 19#include "llvm/Support/raw_ostream.h" 20#include <cstdio> 21#include <cstdlib> 22using namespace llvm; 23 24// ByteSwap - Byteswap 'Var' if 'Really' is true. 25// 26static inline unsigned ByteSwap(unsigned Var, bool Really) { 27 if (!Really) return Var; 28 return ((Var & (255U<< 0U)) << 24U) | 29 ((Var & (255U<< 8U)) << 8U) | 30 ((Var & (255U<<16U)) >> 8U) | 31 ((Var & (255U<<24U)) >> 24U); 32} 33 34static unsigned AddCounts(unsigned A, unsigned B) { 35 // If either value is undefined, use the other. 36 if (A == ProfileInfoLoader::Uncounted) return B; 37 if (B == ProfileInfoLoader::Uncounted) return A; 38 return A + B; 39} 40 41static void ReadProfilingBlock(const char *ToolName, FILE *F, 42 bool ShouldByteSwap, 43 std::vector<unsigned> &Data) { 44 // Read the number of entries... 45 unsigned NumEntries; 46 if (fread(&NumEntries, sizeof(unsigned), 1, F) != 1) { 47 errs() << ToolName << ": data packet truncated!\n"; 48 perror(0); 49 exit(1); 50 } 51 NumEntries = ByteSwap(NumEntries, ShouldByteSwap); 52 53 // Read the counts... 54 std::vector<unsigned> TempSpace(NumEntries); 55 56 // Read in the block of data... 57 if (fread(&TempSpace[0], sizeof(unsigned)*NumEntries, 1, F) != 1) { 58 errs() << ToolName << ": data packet truncated!\n"; 59 perror(0); 60 exit(1); 61 } 62 63 // Make sure we have enough space... The space is initialised to -1 to 64 // facitiltate the loading of missing values for OptimalEdgeProfiling. 65 if (Data.size() < NumEntries) 66 Data.resize(NumEntries, ProfileInfoLoader::Uncounted); 67 68 // Accumulate the data we just read into the data. 69 if (!ShouldByteSwap) { 70 for (unsigned i = 0; i != NumEntries; ++i) { 71 Data[i] = AddCounts(TempSpace[i], Data[i]); 72 } 73 } else { 74 for (unsigned i = 0; i != NumEntries; ++i) { 75 Data[i] = AddCounts(ByteSwap(TempSpace[i], true), Data[i]); 76 } 77 } 78} 79 80const unsigned ProfileInfoLoader::Uncounted = ~0U; 81 82// ProfileInfoLoader ctor - Read the specified profiling data file, exiting the 83// program if the file is invalid or broken. 84// 85ProfileInfoLoader::ProfileInfoLoader(const char *ToolName, 86 const std::string &Filename) 87 : Filename(Filename) { 88 FILE *F = fopen(Filename.c_str(), "rb"); 89 if (F == 0) { 90 errs() << ToolName << ": Error opening '" << Filename << "': "; 91 perror(0); 92 exit(1); 93 } 94 95 // Keep reading packets until we run out of them. 96 unsigned PacketType; 97 while (fread(&PacketType, sizeof(unsigned), 1, F) == 1) { 98 // If the low eight bits of the packet are zero, we must be dealing with an 99 // endianness mismatch. Byteswap all words read from the profiling 100 // information. 101 bool ShouldByteSwap = (char)PacketType == 0; 102 PacketType = ByteSwap(PacketType, ShouldByteSwap); 103 104 switch (PacketType) { 105 case ArgumentInfo: { 106 unsigned ArgLength; 107 if (fread(&ArgLength, sizeof(unsigned), 1, F) != 1) { 108 errs() << ToolName << ": arguments packet truncated!\n"; 109 perror(0); 110 exit(1); 111 } 112 ArgLength = ByteSwap(ArgLength, ShouldByteSwap); 113 114 // Read in the arguments... 115 std::vector<char> Chars(ArgLength+4); 116 117 if (ArgLength) 118 if (fread(&Chars[0], (ArgLength+3) & ~3, 1, F) != 1) { 119 errs() << ToolName << ": arguments packet truncated!\n"; 120 perror(0); 121 exit(1); 122 } 123 CommandLines.push_back(std::string(&Chars[0], &Chars[ArgLength])); 124 break; 125 } 126 127 case FunctionInfo: 128 ReadProfilingBlock(ToolName, F, ShouldByteSwap, FunctionCounts); 129 break; 130 131 case BlockInfo: 132 ReadProfilingBlock(ToolName, F, ShouldByteSwap, BlockCounts); 133 break; 134 135 case EdgeInfo: 136 ReadProfilingBlock(ToolName, F, ShouldByteSwap, EdgeCounts); 137 break; 138 139 case OptEdgeInfo: 140 ReadProfilingBlock(ToolName, F, ShouldByteSwap, OptimalEdgeCounts); 141 break; 142 143 case BBTraceInfo: 144 ReadProfilingBlock(ToolName, F, ShouldByteSwap, BBTrace); 145 break; 146 147 default: 148 errs() << ToolName << ": Unknown packet type #" << PacketType << "!\n"; 149 exit(1); 150 } 151 } 152 153 fclose(F); 154} 155 156