Assembler and .h file for macro assembler for regexp bytecodes. This compile...

src/regexp-codegen.h

Index: src/regexp-codegen.h
===================================================================
--- src/regexp-codegen.h	(revision 0)
+++ src/regexp-codegen.h	(revision 0)
@@ -0,0 +1,115 @@
+// Copyright 2008 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:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef V8_REGEXP_CODEGEN_H_
+#define V8_REGEXP_CODEGEN_H_
+
+namespace v8 { namespace internal {
+
+
+struct DisjunctDecisionRow {
+  RegExpCharacterClass cc;
+  Label* on_match;
+  int actions;
+};
+
+
+// Actions.  These are things that can be specified to happen on a
+// match or failure when generating code.
+static const int kNoAction                      = 0x00;
+// Pop the current position in the subject from the backtracking stack.
+static const int kPopCurrentPosition            = 0x01;
+// Push the current position in the subject onto the backtracking stack.
+static const int kPushCurrentPosition           = 0x04;
+// As above, but in CheckCharacter and CheckCharacterClass which take an
+// offset, the offset is added to the current position first.
+static const int kPushCurrentPositionPlusOffset = 0x06;
+// Pop a new state from the stack and go to it.
+static const int kBacktrack                     = 0x08;
+// Goto the label that is given in another argument.
+static const int kGotoLabel                     = 0x10;
+// Advance current position (by the offset + 1).
+static const int kAdvanceCurrentPosition        = 0x20;
+// Push the label that is given in another argument onto the backtrack stack.
+static const int kPushBacktrackState            = 0x40;
+// The entire regexp has succeeded.
+static const int kSuccess                       = 0x80;
+// The entire regexp has failed to match.
+static const int kFailure                      = 0x100;
+
+
+template <typename SubjectChar>
+class RegexpCodeGenerator {
+ public:
+  RegexpCodeGenerator() { }
+  virtual ~RegexpCodeGenerator() { }
+  virtual void Bind(Label* label) = 0;
+  // Writes the current position in the subject string into the given index of
+  // the captures array.  The old value is pushed to the stack.
+  virtual void WriteCaptureInfo(int index) = 0;
+  // Pops the the given index of the capture array from the stack.
+  virtual void PopCaptureInfo(int index) = 0;
+  // Pushes the current position in the subject string onto the stack for later
+  // retrieval.
+  virtual void PushCurrentPosition() = 0;
+  // Pops the current position in the subject string.
+  virtual void PopCurrentPosition() = 0;
+  // Check the current character for a match with a character class.  Take
+  // one of the actions depending on whether there is a match.
+  virtual void AdvanceCurrentPosition(int by) = 0;
+  // Looks at the next character from the subject and performs the corresponding
+  // action according to whether it matches.  Success_action can only be one of
+  // kAdvanceCurrentPosition or kNoAction.
+  virtual void CheckCharacterClass(
+      RegExpCharacterClass* cclass,
+      int success_action,
+      int fail_action,
+      int offset,                      // Offset from current subject position.
+      Label* fail_state = NULL) = 0;   // Used by kGotoLabel on failure.
+  // Check the current character for a match with a character class.  Take
+  // one of the actions depending on whether there is a match.
+  virtual void CheckCharacters(
+      Vector<uc16> string,
+      int fail_action,
+      int offset,
+      Label* state = NULL) = 0;        // Used by kGotoLabel on failure.
+  // Perform an action unconditionally.
+  virtual void Action(
+      int action,
+      Label* state = NULL) = 0;
+  // Peek at the next character and find out which of the disjunct character
+  // classes it is in.  Perform the corresponding actions on the corresponding
+  // label.
+  virtual void DisjunctCharacterPeekDispatch(
+      Vector<DisjunctDecisionRow> outcomes) = 0;
+ private:
+};
+
+
+} }  // namespace v8::internal
+
+#endif  // V8_REGEXP_CODEGEN_H_