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+// 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"
+
+#if defined(V8_TARGET_ARCH_ARM)
+
+#include "codegen-inl.h"
+#include "jump-target-inl.h"
+#include "register-allocator-inl.h"
+#include "virtual-frame-inl.h"
+
+namespace v8 {
+namespace internal {
+
+// -------------------------------------------------------------------------
+// JumpTarget implementation.
+
+#define __ ACCESS_MASM(cgen()->masm())
+
+void JumpTarget::DoJump() {
+ ASSERT(cgen()->has_valid_frame());
+ // Live non-frame registers are not allowed at unconditional jumps
+ // because we have no way of invalidating the corresponding results
+ // which are still live in the C++ code.
+ ASSERT(cgen()->HasValidEntryRegisters());
+
+ if (entry_frame_set_) {
+ if (entry_label_.is_bound()) {
+ // If we already bound and generated code at the destination then it
+ // is too late to ask for less optimistic type assumptions.
+ ASSERT(entry_frame_.IsCompatibleWith(cgen()->frame()));
+ }
+ // There already a frame expectation at the target.
+ cgen()->frame()->MergeTo(&entry_frame_);
+ cgen()->DeleteFrame();
+ } else {
+ // Clone the current frame to use as the expected one at the target.
+ set_entry_frame(cgen()->frame());
+ // Zap the fall-through frame since the jump was unconditional.
+ RegisterFile empty;
+ cgen()->SetFrame(NULL, &empty);
+ }
+ if (entry_label_.is_bound()) {
+ // You can't jump backwards to an already bound label unless you admitted
+ // up front that this was a bidirectional jump target. Bidirectional jump
+ // targets will zap their type info when bound in case some later virtual
+ // frame with less precise type info branches to them.
+ ASSERT(direction_ != FORWARD_ONLY);
+ }
+ __ jmp(&entry_label_);
+}
+
+
+void JumpTarget::DoBranch(Condition cond, Hint ignored) {
+ ASSERT(cgen()->has_valid_frame());
+
+ if (entry_frame_set_) {
+ if (entry_label_.is_bound()) {
+ // If we already bound and generated code at the destination then it
+ // is too late to ask for less optimistic type assumptions.
+ ASSERT(entry_frame_.IsCompatibleWith(cgen()->frame()));
+ }
+ // We have an expected frame to merge to on the backward edge.
+ cgen()->frame()->MergeTo(&entry_frame_, cond);
+ } else {
+ // Clone the current frame to use as the expected one at the target.
+ set_entry_frame(cgen()->frame());
+ }
+ if (entry_label_.is_bound()) {
+ // You can't branch backwards to an already bound label unless you admitted
+ // up front that this was a bidirectional jump target. Bidirectional jump
+ // targets will zap their type info when bound in case some later virtual
+ // frame with less precise type info branches to them.
+ ASSERT(direction_ != FORWARD_ONLY);
+ }
+ __ b(cond, &entry_label_);
+ if (cond == al) {
+ cgen()->DeleteFrame();
+ }
+}
+
+
+void JumpTarget::Call() {
+ // Call is used to push the address of the catch block on the stack as
+ // a return address when compiling try/catch and try/finally. We
+ // fully spill the frame before making the call. The expected frame
+ // at the label (which should be the only one) is the spilled current
+ // frame plus an in-memory return address. The "fall-through" frame
+ // at the return site is the spilled current frame.
+ ASSERT(cgen()->has_valid_frame());
+ // There are no non-frame references across the call.
+ ASSERT(cgen()->HasValidEntryRegisters());
+ ASSERT(!is_linked());
+
+ // Calls are always 'forward' so we use a copy of the current frame (plus
+ // one for a return address) as the expected frame.
+ ASSERT(!entry_frame_set_);
+ VirtualFrame target_frame = *cgen()->frame();
+ target_frame.Adjust(1);
+ set_entry_frame(&target_frame);
+
+ __ bl(&entry_label_);
+}
+
+
+void JumpTarget::DoBind() {
+ ASSERT(!is_bound());
+
+ // Live non-frame registers are not allowed at the start of a basic
+ // block.
+ ASSERT(!cgen()->has_valid_frame() || cgen()->HasValidEntryRegisters());
+
+ if (cgen()->has_valid_frame()) {
+ if (direction_ != FORWARD_ONLY) cgen()->frame()->ForgetTypeInfo();
+ // If there is a current frame we can use it on the fall through.
+ if (!entry_frame_set_) {
+ entry_frame_ = *cgen()->frame();
+ entry_frame_set_ = true;
+ } else {
+ cgen()->frame()->MergeTo(&entry_frame_);
+ // On fall through we may have to merge both ways.
+ if (direction_ != FORWARD_ONLY) {
+ // This will not need to adjust the virtual frame entries that are
+ // register allocated since that was done above and they now match.
+ // But it does need to adjust the entry_frame_ of this jump target
+ // to make it potentially less optimistic. Later code can branch back
+ // to this jump target and we need to assert that that code does not
+ // have weaker assumptions about types.
+ entry_frame_.MergeTo(cgen()->frame());
+ }
+ }
+ } else {
+ // If there is no current frame we must have an entry frame which we can
+ // copy.
+ ASSERT(entry_frame_set_);
+ RegisterFile empty;
+ cgen()->SetFrame(new VirtualFrame(&entry_frame_), &empty);
+ }
+
+ __ bind(&entry_label_);
+}
+
+
+#undef __
+
+
+} } // namespace v8::internal
+
+#endif // V8_TARGET_ARCH_ARM