Initial (stub) port of jump targets to the ARM platform....

src/virtual-frame-arm.h

Index: src/virtual-frame-arm.h
===================================================================
--- src/virtual-frame-arm.h	(revision 0)
+++ src/virtual-frame-arm.h	(revision 0)
@@ -0,0 +1,101 @@
+// 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_VIRTUAL_FRAME_ARM_H_
+#define V8_VIRTUAL_FRAME_ARM_H_
+
+#include "macro-assembler.h"
+
+namespace v8 { namespace internal {
+
+// -------------------------------------------------------------------------
+// Virtual frames
+//
+// The virtual frame is an abstraction of the physical stack frame.  It
+// encapsulates the parameters, frame-allocated locals, and the expression
+// stack.  It supports push/pop operations on the expression stack, as well
+// as random access to the expression stack elements, locals, and
+// parameters.
+
+class VirtualFrame {
+ public:
+  // Construct a virtual frame with the given code generator used to
+  // generate code.
+  explicit VirtualFrame(CodeGenerator* cgen);
+
+  // Construct a virtual frame that is a clone of an existing one, initially
+  // with an identical state.
+  explicit VirtualFrame(VirtualFrame* original);
+
+  // Make this virtual frame have a state identical to an expected virtual
+  // frame.  As a side effect, code may be emitted to make this frame match
+  // the expected one.
+  void MergeTo(VirtualFrame* expected);
+
+  // The current top of the expression stack as an assembly operand.
+  MemOperand Top() const { return MemOperand(sp, 0); }
+
+  // An element of the expression stack as an assembly operand.
+  MemOperand Element(int index) const {
+    return MemOperand(sp, index * kPointerSize);
+  }
+
+  // A frame-allocated local as an assembly operand.
+  MemOperand Local(int index) const {
+    ASSERT(0 <= index && index < frame_local_count_);
+    return MemOperand(fp, kLocal0Offset - index * kPointerSize);
+  }
+
+  // The function frame slot.
+  MemOperand Function() const { return MemOperand(fp, kFunctionOffset); }
+
+  // The context frame slot.
+  MemOperand Context() const { return MemOperand(fp, kContextOffset); }
+
+  // A parameter as an assembly operand.
+  MemOperand Parameter(int index) const {
+    // Index -1 corresponds to the receiver.
+    ASSERT(-1 <= index && index <= parameter_count_);
+    return MemOperand(fp, (1 + parameter_count_ - index) * kPointerSize);
+  }
+
+ private:
+  static const int kLocal0Offset = JavaScriptFrameConstants::kLocal0Offset;
+  static const int kFunctionOffset = JavaScriptFrameConstants::kFunctionOffset;
+  static const int kContextOffset = StandardFrameConstants::kContextOffset;
+
+  MacroAssembler* masm_;
+
+  // The number of frame-allocated locals and parameters respectively.
+  int frame_local_count_;
+  int parameter_count_;
+};
+
+
+} }  // namespace v8::internal
+
+#endif  // V8_VIRTUAL_FRAME_ARM_H_