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This patch implements ProfileDataLoader which loads profile data generated by -insert-edge-profiling and updates branch weight metadata accordingly. Patch by Alastair Murray. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162799 91177308-0d34-0410-b5e6-96231b3b80d8
187 lines
6.2 KiB
C++
187 lines
6.2 KiB
C++
//===- ProfileDataLoader.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 ProfileDataLoader class is used to load raw profiling data from the dump
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// file.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Module.h"
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#include "llvm/InstrTypes.h"
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#include "llvm/Analysis/ProfileDataLoader.h"
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#include "llvm/Analysis/ProfileDataTypes.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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namespace llvm {
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template<>
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char ProfileDataT<Function,BasicBlock>::ID = 0;
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raw_ostream& operator<<(raw_ostream &O, const Function *F) {
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return O << F->getName();
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}
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raw_ostream& operator<<(raw_ostream &O, const BasicBlock *BB) {
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return O << BB->getName();
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}
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raw_ostream& operator<<(raw_ostream &O, std::pair<const BasicBlock *, const BasicBlock *> E) {
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O << "(";
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if (E.first)
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O << E.first;
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else
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O << "0";
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O << ",";
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if (E.second)
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O << E.second;
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else
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O << "0";
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return O << ")";
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}
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} // namespace llvm
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/// ByteSwap - Byteswap 'Var' if 'Really' is true. Required when the compiler
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/// host and target have different endianness.
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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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/// AddCounts - Add 'A' and 'B', accounting for the fact that the value of one
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/// (or both) may not be defined.
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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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// Undefined + undefined = undefined.
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if (A == ProfileDataLoader::Uncounted) return B;
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if (B == ProfileDataLoader::Uncounted) return A;
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// Saturate to the maximum storable value. This could change taken/nottaken
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// ratios, but is presumably better than wrapping and thus potentially
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// inverting ratios.
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unsigned long long tmp = (unsigned long long)A + (unsigned long long)B;
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if (tmp > (unsigned long long)ProfileDataLoader::MaxCount)
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tmp = ProfileDataLoader::MaxCount;
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return (unsigned)tmp;
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}
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/// ReadProfilingData - Load 'NumEntries' items of type 'T' from file 'F'
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template <typename T>
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static void ReadProfilingData(const char *ToolName, FILE *F,
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std::vector<T> &Data, size_t NumEntries) {
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// Read in the block of data...
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if (fread(&Data[0], sizeof(T), NumEntries, F) != NumEntries) {
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errs() << ToolName << ": profiling data truncated!\n";
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perror(0);
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exit(1);
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}
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}
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/// ReadProfilingNumEntries - Read how many entries are in this profiling data
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/// packet.
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static unsigned ReadProfilingNumEntries(const char *ToolName, FILE *F,
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bool ShouldByteSwap) {
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std::vector<unsigned> NumEntries(1);
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ReadProfilingData<unsigned>(ToolName, F, NumEntries, 1);
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return ByteSwap(NumEntries[0], ShouldByteSwap);
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}
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/// ReadProfilingBlock - Read the number of entries in the next profiling data
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/// packet and then accumulate the entries into 'Data'.
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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 = ReadProfilingNumEntries(ToolName, F, ShouldByteSwap);
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// Read in the data.
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std::vector<unsigned> TempSpace(NumEntries);
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ReadProfilingData<unsigned>(ToolName, F, TempSpace, (size_t)NumEntries);
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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, ProfileDataLoader::Uncounted);
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// Accumulate the data we just read into the existing data.
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for (unsigned i = 0; i < NumEntries; ++i) {
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Data[i] = AddCounts(ByteSwap(TempSpace[i], ShouldByteSwap), Data[i]);
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}
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}
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/// ReadProfilingArgBlock - Read the command line arguments that the progam was
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/// run with when the current profiling data packet(s) were generated.
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static void ReadProfilingArgBlock(const char *ToolName, FILE *F,
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bool ShouldByteSwap,
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std::vector<std::string> &CommandLines) {
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// Read the number of bytes ...
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unsigned ArgLength = ReadProfilingNumEntries(ToolName, F, ShouldByteSwap);
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// Read in the arguments (if there are any to read). Round up the length to
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// the nearest 4-byte multiple.
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std::vector<char> Args(ArgLength+4);
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if (ArgLength)
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ReadProfilingData<char>(ToolName, F, Args, (ArgLength+3) & ~3);
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// Store the arguments.
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CommandLines.push_back(std::string(&Args[0], &Args[ArgLength]));
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}
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const unsigned ProfileDataLoader::Uncounted = ~0U;
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const unsigned ProfileDataLoader::MaxCount = ~0U - 1U;
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/// ProfileDataLoader ctor - Read the specified profiling data file, exiting
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/// the program if the file is invalid or broken.
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ProfileDataLoader::ProfileDataLoader(const char *ToolName,
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const std::string &Filename)
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: Filename(Filename) {
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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. This can happen when the compiler host and target have
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// different endianness.
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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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ReadProfilingArgBlock(ToolName, F, ShouldByteSwap, CommandLines);
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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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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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