Check in LLVM r95781.
diff --git a/lib/Analysis/ProfileInfoLoader.cpp b/lib/Analysis/ProfileInfoLoader.cpp
new file mode 100644
index 0000000..25481b2
--- /dev/null
+++ b/lib/Analysis/ProfileInfoLoader.cpp
@@ -0,0 +1,158 @@
+//===- 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/Module.h"
+#include "llvm/InstrTypes.h"
+#include "llvm/Support/raw_ostream.h"
+#include <cstdio>
+#include <cstdlib>
+#include <map>
+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,
+ Module &TheModule) :
+ Filename(Filename),
+ M(TheModule), Warned(false) {
+ 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);
+}
+