move StringToOffsetTable out to its own header.

llvm-svn: 81740

1 files changed, 1 insertions, 56 deletions

diff --git a/llvm/utils/TableGen/AsmWriterEmitter.cpp b/llvm/utils/TableGen/AsmWriterEmitter.cpp
index aee4653bcde..8f8f89a79b0 100644
--- a/llvm/utils/TableGen/AsmWriterEmitter.cpp
+++ b/llvm/utils/TableGen/AsmWriterEmitter.cpp
@@ -15,68 +15,13 @@
 #include "AsmWriterEmitter.h"
 #include "CodeGenTarget.h"
 #include "Record.h"
+#include "StringToOffsetTable.h"
 #include "llvm/ADT/StringExtras.h"
-#include "llvm/ADT/StringMap.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/MathExtras.h"
 #include <algorithm>
 using namespace llvm;
 
-/// StringToOffsetTable - This class uniques a bunch of nul-terminated strings
-/// and keeps track of their offset in a massive contiguous string allocation.
-/// It can then output this string blob and use indexes into the string to
-/// reference each piece.
-class StringToOffsetTable {
-  StringMap<unsigned> StringOffset;
-  std::string AggregateString;
-public:
-
-  unsigned GetOrAddStringOffset(StringRef Str) {
-    unsigned &Entry = StringOffset[Str];
-    if (Entry == 0) {
-      // Add the string to the aggregate if this is the first time found.
-      Entry = AggregateString.size();
-      AggregateString.append(Str.begin(), Str.end());
-      AggregateString += '\0';
-    }
-    
-    return Entry;
-  }
-  
-  void EmitString(raw_ostream &O) {
-    O << "    \"";
-    unsigned CharsPrinted = 0;
-    EscapeString(AggregateString);
-    for (unsigned i = 0, e = AggregateString.size(); i != e; ++i) {
-      if (CharsPrinted > 70) {
-        O << "\"\n    \"";
-        CharsPrinted = 0;
-      }
-      O << AggregateString[i];
-      ++CharsPrinted;
-      
-      // Print escape sequences all together.
-      if (AggregateString[i] != '\\')
-        continue;
-      
-      assert(i+1 < AggregateString.size() && "Incomplete escape sequence!");
-      if (isdigit(AggregateString[i+1])) {
-        assert(isdigit(AggregateString[i+2]) && 
-               isdigit(AggregateString[i+3]) &&
-               "Expected 3 digit octal escape!");
-        O << AggregateString[++i];
-        O << AggregateString[++i];
-        O << AggregateString[++i];
-        CharsPrinted += 3;
-      } else {
-        O << AggregateString[++i];
-        ++CharsPrinted;
-      }
-    }
-    O << "\"";
-  }
-};
-
 
 static bool isIdentChar(char C) {
   return (C >= 'a' && C <= 'z') ||