1 files changed, 133 insertions, 0 deletions
diff --git a/contrib/llvm/lib/CodeGen/AsmPrinter/DebugLocStream.h b/contrib/llvm/lib/CodeGen/AsmPrinter/DebugLocStream.h
new file mode 100644
index 0000000..3001da2
--- /dev/null
+++ b/contrib/llvm/lib/CodeGen/AsmPrinter/DebugLocStream.h
@@ -0,0 +1,133 @@
+//===--- lib/CodeGen/DebugLocStream.h - DWARF debug_loc stream --*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_CODEGEN_ASMPRINTER_DEBUGLOCSTREAM_H
+#define LLVM_LIB_CODEGEN_ASMPRINTER_DEBUGLOCSTREAM_H
+
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/SmallVector.h"
+#include "ByteStreamer.h"
+
+namespace llvm {
+class DwarfCompileUnit;
+class MCSymbol;
+
+/// \brief Byte stream of .debug_loc entries.
+///
+/// Stores a unified stream of .debug_loc entries.  There's \a List for each
+/// variable/inlined-at pair, and an \a Entry for each \a DebugLocEntry.
+///
+/// FIXME: Do we need all these temp symbols?
+/// FIXME: Why not output directly to the output stream?
+class DebugLocStream {
+public:
+  struct List {
+    DwarfCompileUnit *CU;
+    MCSymbol *Label;
+    size_t EntryOffset;
+    List(DwarfCompileUnit *CU, MCSymbol *Label, size_t EntryOffset)
+        : CU(CU), Label(Label), EntryOffset(EntryOffset) {}
+  };
+  struct Entry {
+    const MCSymbol *BeginSym;
+    const MCSymbol *EndSym;
+    size_t ByteOffset;
+    size_t CommentOffset;
+    Entry(const MCSymbol *BeginSym, const MCSymbol *EndSym, size_t ByteOffset,
+          size_t CommentOffset)
+        : BeginSym(BeginSym), EndSym(EndSym), ByteOffset(ByteOffset),
+          CommentOffset(CommentOffset) {}
+  };
+
+private:
+  SmallVector<List, 4> Lists;
+  SmallVector<Entry, 32> Entries;
+  SmallString<256> DWARFBytes;
+  SmallVector<std::string, 32> Comments;
+
+  /// \brief Only verbose textual output needs comments.  This will be set to
+  /// true for that case, and false otherwise.
+  bool GenerateComments;
+
+public:
+  DebugLocStream(bool GenerateComments) : GenerateComments(GenerateComments) { }
+  size_t getNumLists() const { return Lists.size(); }
+  const List &getList(size_t LI) const { return Lists[LI]; }
+  ArrayRef<List> getLists() const { return Lists; }
+
+  /// \brief Start a new .debug_loc entry list.
+  ///
+  /// Start a new .debug_loc entry list.  Return the new list's index so it can
+  /// be retrieved later via \a getList().
+  ///
+  /// Until the next call, \a startEntry() will add entries to this list.
+  size_t startList(DwarfCompileUnit *CU, MCSymbol *Label) {
+    size_t LI = Lists.size();
+    Lists.emplace_back(CU, Label, Entries.size());
+    return LI;
+  }
+
+  /// \brief Start a new .debug_loc entry.
+  ///
+  /// Until the next call, bytes added to the stream will be added to this
+  /// entry.
+  void startEntry(const MCSymbol *BeginSym, const MCSymbol *EndSym) {
+    Entries.emplace_back(BeginSym, EndSym, DWARFBytes.size(), Comments.size());
+  }
+
+  BufferByteStreamer getStreamer() {
+    return BufferByteStreamer(DWARFBytes, Comments, GenerateComments);
+  }
+
+  ArrayRef<Entry> getEntries(const List &L) const {
+    size_t LI = getIndex(L);
+    return makeArrayRef(Entries)
+        .slice(Lists[LI].EntryOffset, getNumEntries(LI));
+  }
+
+  ArrayRef<char> getBytes(const Entry &E) const {
+    size_t EI = getIndex(E);
+    return makeArrayRef(DWARFBytes.begin(), DWARFBytes.end())
+        .slice(Entries[EI].ByteOffset, getNumBytes(EI));
+  }
+  ArrayRef<std::string> getComments(const Entry &E) const {
+    size_t EI = getIndex(E);
+    return makeArrayRef(Comments)
+        .slice(Entries[EI].CommentOffset, getNumComments(EI));
+  }
+
+private:
+  size_t getIndex(const List &L) const {
+    assert(&Lists.front() <= &L && &L <= &Lists.back() &&
+           "Expected valid list");
+    return &L - &Lists.front();
+  }
+  size_t getIndex(const Entry &E) const {
+    assert(&Entries.front() <= &E && &E <= &Entries.back() &&
+           "Expected valid entry");
+    return &E - &Entries.front();
+  }
+  size_t getNumEntries(size_t LI) const {
+    if (LI + 1 == Lists.size())
+      return Entries.size() - Lists[LI].EntryOffset;
+    return Lists[LI + 1].EntryOffset - Lists[LI].EntryOffset;
+  }
+  size_t getNumBytes(size_t EI) const {
+    if (EI + 1 == Entries.size())
+      return DWARFBytes.size() - Entries[EI].ByteOffset;
+    return Entries[EI + 1].ByteOffset - Entries[EI].ByteOffset;
+  }
+  size_t getNumComments(size_t EI) const {
+    if (EI + 1 == Entries.size())
+      return Comments.size() - Entries[EI].CommentOffset;
+    return Entries[EI + 1].CommentOffset - Entries[EI].CommentOffset;
+  }
+};
+}
+#endif