1 files changed, 229 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Support/SourceMgr.cpp b/contrib/llvm/lib/Support/SourceMgr.cpp
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+++ b/contrib/llvm/lib/Support/SourceMgr.cpp
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+//===- SourceMgr.cpp - Manager for Simple Source Buffers & Diagnostics ----===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the SourceMgr class.  This class is used as a simple
+// substrate for diagnostics, #include handling, and other low level things for
+// simple parsers.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/SourceMgr.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/raw_ostream.h"
+using namespace llvm;
+
+namespace {
+  struct LineNoCacheTy {
+    int LastQueryBufferID;
+    const char *LastQuery;
+    unsigned LineNoOfQuery;
+  };
+}
+
+static LineNoCacheTy *getCache(void *Ptr) {
+  return (LineNoCacheTy*)Ptr;
+}
+
+
+SourceMgr::~SourceMgr() {
+  // Delete the line # cache if allocated.
+  if (LineNoCacheTy *Cache = getCache(LineNoCache))
+    delete Cache;
+
+  while (!Buffers.empty()) {
+    delete Buffers.back().Buffer;
+    Buffers.pop_back();
+  }
+}
+
+/// AddIncludeFile - Search for a file with the specified name in the current
+/// directory or in one of the IncludeDirs.  If no file is found, this returns
+/// ~0, otherwise it returns the buffer ID of the stacked file.
+unsigned SourceMgr::AddIncludeFile(const std::string &Filename,
+                                   SMLoc IncludeLoc) {
+
+  MemoryBuffer *NewBuf = MemoryBuffer::getFile(Filename.c_str());
+
+  // If the file didn't exist directly, see if it's in an include path.
+  for (unsigned i = 0, e = IncludeDirectories.size(); i != e && !NewBuf; ++i) {
+    std::string IncFile = IncludeDirectories[i] + "/" + Filename;
+    NewBuf = MemoryBuffer::getFile(IncFile.c_str());
+  }
+
+  if (NewBuf == 0) return ~0U;
+
+  return AddNewSourceBuffer(NewBuf, IncludeLoc);
+}
+
+
+/// FindBufferContainingLoc - Return the ID of the buffer containing the
+/// specified location, returning -1 if not found.
+int SourceMgr::FindBufferContainingLoc(SMLoc Loc) const {
+  for (unsigned i = 0, e = Buffers.size(); i != e; ++i)
+    if (Loc.getPointer() >= Buffers[i].Buffer->getBufferStart() &&
+        // Use <= here so that a pointer to the null at the end of the buffer
+        // is included as part of the buffer.
+        Loc.getPointer() <= Buffers[i].Buffer->getBufferEnd())
+      return i;
+  return -1;
+}
+
+/// FindLineNumber - Find the line number for the specified location in the
+/// specified file.  This is not a fast method.
+unsigned SourceMgr::FindLineNumber(SMLoc Loc, int BufferID) const {
+  if (BufferID == -1) BufferID = FindBufferContainingLoc(Loc);
+  assert(BufferID != -1 && "Invalid Location!");
+
+  MemoryBuffer *Buff = getBufferInfo(BufferID).Buffer;
+
+  // Count the number of \n's between the start of the file and the specified
+  // location.
+  unsigned LineNo = 1;
+
+  const char *Ptr = Buff->getBufferStart();
+
+  // If we have a line number cache, and if the query is to a later point in the
+  // same file, start searching from the last query location.  This optimizes
+  // for the case when multiple diagnostics come out of one file in order.
+  if (LineNoCacheTy *Cache = getCache(LineNoCache))
+    if (Cache->LastQueryBufferID == BufferID &&
+        Cache->LastQuery <= Loc.getPointer()) {
+      Ptr = Cache->LastQuery;
+      LineNo = Cache->LineNoOfQuery;
+    }
+
+  // Scan for the location being queried, keeping track of the number of lines
+  // we see.
+  for (; SMLoc::getFromPointer(Ptr) != Loc; ++Ptr)
+    if (*Ptr == '\n') ++LineNo;
+
+
+  // Allocate the line number cache if it doesn't exist.
+  if (LineNoCache == 0)
+    LineNoCache = new LineNoCacheTy();
+
+  // Update the line # cache.
+  LineNoCacheTy &Cache = *getCache(LineNoCache);
+  Cache.LastQueryBufferID = BufferID;
+  Cache.LastQuery = Ptr;
+  Cache.LineNoOfQuery = LineNo;
+  return LineNo;
+}
+
+void SourceMgr::PrintIncludeStack(SMLoc IncludeLoc, raw_ostream &OS) const {
+  if (IncludeLoc == SMLoc()) return;  // Top of stack.
+
+  int CurBuf = FindBufferContainingLoc(IncludeLoc);
+  assert(CurBuf != -1 && "Invalid or unspecified location!");
+
+  PrintIncludeStack(getBufferInfo(CurBuf).IncludeLoc, OS);
+
+  OS << "Included from "
+     << getBufferInfo(CurBuf).Buffer->getBufferIdentifier()
+     << ":" << FindLineNumber(IncludeLoc, CurBuf) << ":\n";
+}
+
+
+/// GetMessage - Return an SMDiagnostic at the specified location with the
+/// specified string.
+///
+/// @param Type - If non-null, the kind of message (e.g., "error") which is
+/// prefixed to the message.
+SMDiagnostic SourceMgr::GetMessage(SMLoc Loc, const std::string &Msg,
+                                   const char *Type, bool ShowLine) const {
+
+  // First thing to do: find the current buffer containing the specified
+  // location.
+  int CurBuf = FindBufferContainingLoc(Loc);
+  assert(CurBuf != -1 && "Invalid or unspecified location!");
+
+  MemoryBuffer *CurMB = getBufferInfo(CurBuf).Buffer;
+
+  // Scan backward to find the start of the line.
+  const char *LineStart = Loc.getPointer();
+  while (LineStart != CurMB->getBufferStart() &&
+         LineStart[-1] != '\n' && LineStart[-1] != '\r')
+    --LineStart;
+
+  std::string LineStr;
+  if (ShowLine) {
+    // Get the end of the line.
+    const char *LineEnd = Loc.getPointer();
+    while (LineEnd != CurMB->getBufferEnd() &&
+           LineEnd[0] != '\n' && LineEnd[0] != '\r')
+      ++LineEnd;
+    LineStr = std::string(LineStart, LineEnd);
+  }
+
+  std::string PrintedMsg;
+  if (Type) {
+    PrintedMsg = Type;
+    PrintedMsg += ": ";
+  }
+  PrintedMsg += Msg;
+
+  return SMDiagnostic(*this, Loc,
+                      CurMB->getBufferIdentifier(), FindLineNumber(Loc, CurBuf),
+                      Loc.getPointer()-LineStart, PrintedMsg,
+                      LineStr, ShowLine);
+}
+
+void SourceMgr::PrintMessage(SMLoc Loc, const std::string &Msg,
+                             const char *Type, bool ShowLine) const {
+  // Report the message with the diagnostic handler if present.
+  if (DiagHandler) {
+    DiagHandler(GetMessage(Loc, Msg, Type, ShowLine),
+                DiagContext, DiagLocCookie);
+    return;
+  }
+  
+  raw_ostream &OS = errs();
+
+  int CurBuf = FindBufferContainingLoc(Loc);
+  assert(CurBuf != -1 && "Invalid or unspecified location!");
+  PrintIncludeStack(getBufferInfo(CurBuf).IncludeLoc, OS);
+
+  GetMessage(Loc, Msg, Type, ShowLine).Print(0, OS);
+}
+
+//===----------------------------------------------------------------------===//
+// SMDiagnostic Implementation
+//===----------------------------------------------------------------------===//
+
+void SMDiagnostic::Print(const char *ProgName, raw_ostream &S) const {
+  if (ProgName && ProgName[0])
+    S << ProgName << ": ";
+
+  if (!Filename.empty()) {
+    if (Filename == "-")
+      S << "<stdin>";
+    else
+      S << Filename;
+
+    if (LineNo != -1) {
+      S << ':' << LineNo;
+      if (ColumnNo != -1)
+        S << ':' << (ColumnNo+1);
+    }
+    S << ": ";
+  }
+
+  S << Message << '\n';
+
+  if (LineNo != -1 && ColumnNo != -1 && ShowLine) {
+    S << LineContents << '\n';
+
+    // Print out spaces/tabs before the caret.
+    for (unsigned i = 0; i != unsigned(ColumnNo); ++i)
+      S << (LineContents[i] == '\t' ? '\t' : ' ');
+    S << "^\n";
+  }
+}
+
+