1 //===- ProfileInfoLoad.cpp - Load profile information from disk -----------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // The ProfileInfoLoader class is used to load and represent profiling
11 // information read in from the dump file.
13 //===----------------------------------------------------------------------===//
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"
24 // ByteSwap - Byteswap 'Var' if 'Really' is true.
26 static 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);
34 static 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;
41 static void ReadProfilingBlock(const char *ToolName, FILE *F,
43 std::vector<unsigned> &Data) {
44 // Read the number of entries...
46 if (fread(&NumEntries, sizeof(unsigned), 1, F) != 1) {
47 errs() << ToolName << ": data packet truncated!\n";
51 NumEntries = ByteSwap(NumEntries, ShouldByteSwap);
54 std::vector<unsigned> TempSpace(NumEntries);
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";
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);
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]);
74 for (unsigned i = 0; i != NumEntries; ++i) {
75 Data[i] = AddCounts(ByteSwap(TempSpace[i], true), Data[i]);
80 const unsigned ProfileInfoLoader::Uncounted = ~0U;
82 // ProfileInfoLoader ctor - Read the specified profiling data file, exiting the
83 // program if the file is invalid or broken.
85 ProfileInfoLoader::ProfileInfoLoader(const char *ToolName,
86 const std::string &Filename)
87 : Filename(Filename) {
88 FILE *F = fopen(Filename.c_str(), "rb");
90 errs() << ToolName << ": Error opening '" << Filename << "': ";
95 // Keep reading packets until we run out of them.
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
101 bool ShouldByteSwap = (char)PacketType == 0;
102 PacketType = ByteSwap(PacketType, ShouldByteSwap);
104 switch (PacketType) {
107 if (fread(&ArgLength, sizeof(unsigned), 1, F) != 1) {
108 errs() << ToolName << ": arguments packet truncated!\n";
112 ArgLength = ByteSwap(ArgLength, ShouldByteSwap);
114 // Read in the arguments...
115 std::vector<char> Chars(ArgLength+4);
118 if (fread(&Chars[0], (ArgLength+3) & ~3, 1, F) != 1) {
119 errs() << ToolName << ": arguments packet truncated!\n";
123 CommandLines.push_back(std::string(&Chars[0], &Chars[ArgLength]));
128 ReadProfilingBlock(ToolName, F, ShouldByteSwap, FunctionCounts);
132 ReadProfilingBlock(ToolName, F, ShouldByteSwap, BlockCounts);
136 ReadProfilingBlock(ToolName, F, ShouldByteSwap, EdgeCounts);
140 ReadProfilingBlock(ToolName, F, ShouldByteSwap, OptimalEdgeCounts);
144 ReadProfilingBlock(ToolName, F, ShouldByteSwap, BBTrace);
148 errs() << ToolName << ": Unknown packet type #" << PacketType << "!\n";