Add bytecodes and an interpreter for executing regular expressions. Very...

src/assembler-re2k-inl.h

Index: src/assembler-re2k-inl.h
===================================================================
--- src/assembler-re2k-inl.h	(revision 0)
+++ src/assembler-re2k-inl.h	(revision 0)
@@ -0,0 +1,97 @@
+// 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.
+
+// A light-weight assembler for the Regexp2000 byte code.
+
+
+#include "v8.h"
+#include "ast.h"
+#include "bytecodes-re2k.h"
+#include "regexp-codegen.h"
+#include "assembler-re2k.h"
+
+
+namespace v8 { namespace internal {
+
+
+void Re2kAssembler::Emit(uint32_t byte) {
+  *pc_++ = byte;
+}
+
+
+void Re2kAssembler::Emit16(uint32_t word) {
+  union {
+    byte bytes[2];
+    uint16_t word;
+  } u;
+  u.word = static_cast<uint16_t>(word);
+  Emit(u.bytes[0]);
+  Emit(u.bytes[1]);
+}
+
+
+void Re2kAssembler::Emit32(uint32_t word) {
+  union {
+    byte bytes[4];
+    uint32_t word;
+  } u;
+  u.word = word;
+  Emit(u.bytes[0]);
+  Emit(u.bytes[1]);
+  Emit(u.bytes[2]);
+  Emit(u.bytes[3]);
+}
+
+
+void Re2kAssembler::Store32(uint32_t word, byte* p) {
+  union {
+    byte bytes[4];
+    uint32_t word;
+  } u;
+  u.word = word;
+  p[0] = u.bytes[0];
+  p[1] = u.bytes[1];
+  p[2] = u.bytes[2];
+  p[3] = u.bytes[3];
+}
+
+
+void Re2kAssembler::EmitOrLink(Label* l) {
+    if (l->is_bound()) {
+      Emit32(l->pos());
+    } else {
+      int pos = 0;
+      if (l->is_linked()) {
+        pos = l->pos();
+      }
+      l->link_to(pc_ - buffer_);
+      Emit32(pos);
+      pc_ += 4;
+    }
+  }
+
+} }  // namespace v8::internal