Implement loop for global regexps in regexp assembler.

src/x64/regexp-macro-assembler-x64.h

Index: src/x64/regexp-macro-assembler-x64.h
diff --git a/src/x64/regexp-macro-assembler-x64.h b/src/x64/regexp-macro-assembler-x64.h
index cd24b6098185ceeff831e19605f3928282af490b..22b4b592bf5b875d41b26285f26a514a1c63b6a2 100644
--- a/src/x64/regexp-macro-assembler-x64.h
+++ b/src/x64/regexp-macro-assembler-x64.h
@@ -1,4 +1,4 @@
-// Copyright 2010 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -154,7 +154,11 @@ class RegExpMacroAssemblerX64: public NativeRegExpMacroAssembler {
   static const int kInputStart = kStartIndex + kPointerSize;
   static const int kInputEnd = kInputStart + kPointerSize;
   static const int kRegisterOutput = kInputEnd + kPointerSize;
-  static const int kStackHighEnd = kRegisterOutput + kPointerSize;
+  // For the case of global regular expression, we have room to store at least
+  // one set of capture results.  For the case of non-global regexp, we ignore
+  // this value.
+  static const int kNumOutputRegisters = kRegisterOutput + kPointerSize;
+  static const int kStackHighEnd = kNumOutputRegisters + kPointerSize;
   // DirectCall is passed as 32 bit int (values 0 or 1).
   static const int kDirectCall = kStackHighEnd + kPointerSize;
   static const int kIsolate = kDirectCall + kPointerSize;
@@ -167,8 +171,12 @@ class RegExpMacroAssemblerX64: public NativeRegExpMacroAssembler {
   static const int kInputStart = kStartIndex - kPointerSize;
   static const int kInputEnd = kInputStart - kPointerSize;
   static const int kRegisterOutput = kInputEnd - kPointerSize;
-  static const int kStackHighEnd = kRegisterOutput - kPointerSize;
-  static const int kDirectCall = kFrameAlign;
+  // For the case of global regular expression, we have room to store at least
+  // one set of capture results.  For the case of non-global regexp, we ignore
+  // this value.
+  static const int kNumOutputRegisters = kRegisterOutput - kPointerSize;
+  static const int kStackHighEnd = kFrameAlign;
+  static const int kDirectCall = kStackHighEnd + kPointerSize;
   static const int kIsolate = kDirectCall + kPointerSize;
 #endif
 
@@ -183,14 +191,14 @@ class RegExpMacroAssemblerX64: public NativeRegExpMacroAssembler {
   // AMD64 Calling Convention has only one callee-save register that
   // we use. We push this after the frame pointer (and after the
   // parameters).
-  static const int kBackup_rbx = kStackHighEnd - kPointerSize;
+  static const int kBackup_rbx = kNumOutputRegisters - kPointerSize;
   static const int kLastCalleeSaveRegister = kBackup_rbx;
 #endif
 
+  static const int kSuccessfulCaptures = kBackup_rbx - kPointerSize;
   // When adding local variables remember to push space for them in
   // the frame in GetCode.
-  static const int kInputStartMinusOne =
-      kLastCalleeSaveRegister - kPointerSize;
+  static const int kInputStartMinusOne = kSuccessfulCaptures - kPointerSize;
 
   // First register address. Following registers are below it on the stack.
   static const int kRegisterZero = kInputStartMinusOne - kPointerSize;