1 files changed, 157 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Analysis/ProfileInfoLoader.cpp b/contrib/llvm/lib/Analysis/ProfileInfoLoader.cpp
new file mode 100644
index 0000000..eaa38da
--- /dev/null
+++ b/contrib/llvm/lib/Analysis/ProfileInfoLoader.cpp
@@ -0,0 +1,157 @@
+//===- 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>
+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);
+}
+