First step towards making JumpTarget work on ARM. Instead...

src/jump-target-light.cc

 // Copyright 2010 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
@@ skipping 16 matching lines @@
 
 #include "v8.h"
 
 #include "codegen-inl.h"
 #include "jump-target-inl.h"
 
 namespace v8 {
 namespace internal {
 
 
-void JumpTarget::Jump(Result* arg) {
-  UNIMPLEMENTED();
-}
-
-
-void JumpTarget::Branch(Condition cc, Result* arg, Hint hint) {
-  UNIMPLEMENTED();
-}
-
-
-void JumpTarget::Branch(Condition cc, Result* arg0, Result* arg1, Hint hint) {
-  UNIMPLEMENTED();
-}
-
-
-void BreakTarget::Branch(Condition cc, Result* arg, Hint hint) {
-  UNIMPLEMENTED();
-}
-
-
-void JumpTarget::Bind(Result* arg) {
-  UNIMPLEMENTED();
-}
-
-
-void JumpTarget::Bind(Result* arg0, Result* arg1) {
-  UNIMPLEMENTED();
-}
-
-
-void JumpTarget::ComputeEntryFrame() {
-  UNIMPLEMENTED();
-}
-
-
 DeferredCode::DeferredCode()
     : masm_(CodeGeneratorScope::Current()->masm()),
       statement_position_(masm_->current_statement_position()),
       position_(masm_->current_position()) {
   ASSERT(statement_position_ != RelocInfo::kNoPosition);
   ASSERT(position_ != RelocInfo::kNoPosition);
 
   CodeGeneratorScope::Current()->AddDeferred(this);
 
 #ifdef DEBUG
   CodeGeneratorScope::Current()->frame()->AssertIsSpilled();
 #endif
 }
 
+
+// -------------------------------------------------------------------------
+// BreakTarget implementation.
+
+
+void BreakTarget::SetExpectedHeight() {
+  expected_height_ = cgen()->frame()->height();
+}
+
+
+void BreakTarget::Jump() {
+  ASSERT(cgen()->has_valid_frame());
+
+  int count = cgen()->frame()->height() - expected_height_;
+  if (count > 0) {
+    cgen()->frame()->Drop(count);
+  }
+  DoJump();
+}
+
+
+void BreakTarget::Branch(Condition cc, Hint hint) {
+  if (cc == al) {
+    Jump();
+    return;
+  }
+
+  ASSERT(cgen()->has_valid_frame());
+
+  int count = cgen()->frame()->height() - expected_height_;
+  if (count > 0) {
+    // We negate and branch here rather than using DoBranch's negate
+    // and branch.  This gives us a hook to remove statement state
+    // from the frame.
+    JumpTarget fall_through;
+    // Branch to fall through will not negate, because it is a
+    // forward-only target.
+    fall_through.Branch(NegateCondition(cc), NegateHint(hint));
+    // Emit merge code.
+    cgen()->frame()->Drop(count);
+    DoJump();
+    fall_through.Bind();
+  } else {
+    DoBranch(cc, hint);
+  }
+}
+
+
+void BreakTarget::Bind() {
+  if (cgen()->has_valid_frame()) {
+    int count = cgen()->frame()->height() - expected_height_;
+    if (count > 0) {
+      cgen()->frame()->Drop(count);
+    }
+  }
+  DoBind();
+}
+
 } }  // namespace v8::internal