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

src/jump-target-arm.cc

Index: src/jump-target-arm.cc
===================================================================
--- src/jump-target-arm.cc	(revision 0)
+++ src/jump-target-arm.cc	(revision 0)
@@ -0,0 +1,114 @@
+// 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.
+
+#include "v8.h"
+
+#include "codegen.h"
+#include "jump-target.h"
+
+namespace v8 { namespace internal {
+
+// -------------------------------------------------------------------------
+// JumpTarget implementation.
+
+#define __ masm_->
+
+JumpTarget::JumpTarget(CodeGenerator* cgen) {
+  ASSERT(cgen != NULL);
+  expected_frame_ = NULL;
+  code_generator_ = cgen;
+  masm_ = cgen->masm();
+}
+
+
+JumpTarget::JumpTarget()
+    : expected_frame_(NULL),
+      code_generator_(NULL),
+      masm_(NULL) {
+}
+
+
+void JumpTarget::set_code_generator(CodeGenerator* cgen) {
+  ASSERT(cgen != NULL);
+  ASSERT(code_generator_ == NULL);
+  code_generator_ = cgen;
+  masm_ = cgen->masm();
+}
+
+
+void JumpTarget::Jump() {
+  __ b(&label_);
+}
+
+void JumpTarget::Branch(Condition cc) {
+  __ b(cc, &label_);
+}
+
+void JumpTarget::Bind() {
+  __ bind(&label_);
+}
+
+
+// -------------------------------------------------------------------------
+// ShadowTarget implementation.
+
+ShadowTarget::ShadowTarget(JumpTarget* original) {
+  ASSERT(original != NULL);
+  original_target_ = original;
+  original_pos_ = original->label()->pos_;
+  original_expected_frame_ = original->expected_frame();
+
+  // We do not call Unuse() on the orginal jump target, because we do not
+  // want to delete the expected frame.
+  original->label()->pos_ = 0;
+  original->set_expected_frame(NULL);
+#ifdef DEBUG
+  is_shadowing_ = true;
+#endif
+}
+
+
+void ShadowTarget::StopShadowing() {
+  ASSERT(is_shadowing_);
+  ASSERT(is_unused());
+
+  set_code_generator(original_target_->code_generator());
+  label_.pos_ = original_target_->label()->pos_;
+  expected_frame_ = original_target_->expected_frame();
+
+  original_target_->label()->pos_ = original_pos_;
+  original_target_->set_expected_frame(original_expected_frame_);
+
+#ifdef DEBUG
+  is_shadowing_ = false;
+#endif
+}
+
+#undef __
+
+
+} }  // namespace v8::internal