251b1c5f93
Review URL: http://codereview.chromium.org/2828004 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4932 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
165 lines
6.0 KiB
C++
165 lines
6.0 KiB
C++
// Copyright 2008 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "v8.h"
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#if defined(V8_TARGET_ARCH_ARM)
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#include "codegen-inl.h"
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#include "jump-target-inl.h"
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#include "register-allocator-inl.h"
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#include "virtual-frame-inl.h"
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namespace v8 {
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namespace internal {
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// -------------------------------------------------------------------------
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// JumpTarget implementation.
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#define __ ACCESS_MASM(cgen()->masm())
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void JumpTarget::DoJump() {
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ASSERT(cgen()->has_valid_frame());
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// Live non-frame registers are not allowed at unconditional jumps
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// because we have no way of invalidating the corresponding results
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// which are still live in the C++ code.
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ASSERT(cgen()->HasValidEntryRegisters());
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if (entry_frame_set_) {
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if (entry_label_.is_bound()) {
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// If we already bound and generated code at the destination then it
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// is too late to ask for less optimistic type assumptions.
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ASSERT(entry_frame_.IsCompatibleWith(cgen()->frame()));
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}
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// There already a frame expectation at the target.
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cgen()->frame()->MergeTo(&entry_frame_);
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cgen()->DeleteFrame();
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} else {
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// Clone the current frame to use as the expected one at the target.
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set_entry_frame(cgen()->frame());
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// Zap the fall-through frame since the jump was unconditional.
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RegisterFile empty;
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cgen()->SetFrame(NULL, &empty);
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}
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if (entry_label_.is_bound()) {
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// You can't jump backwards to an already bound label unless you admitted
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// up front that this was a bidirectional jump target. Bidirectional jump
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// targets will zap their type info when bound in case some later virtual
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// frame with less precise type info branches to them.
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ASSERT(direction_ != FORWARD_ONLY);
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}
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__ jmp(&entry_label_);
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}
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void JumpTarget::DoBranch(Condition cc, Hint ignored) {
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ASSERT(cgen()->has_valid_frame());
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if (entry_frame_set_) {
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if (entry_label_.is_bound()) {
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// If we already bound and generated code at the destination then it
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// is too late to ask for less optimistic type assumptions.
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ASSERT(entry_frame_.IsCompatibleWith(cgen()->frame()));
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}
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// We have an expected frame to merge to on the backward edge.
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cgen()->frame()->MergeTo(&entry_frame_, cc);
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} else {
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// Clone the current frame to use as the expected one at the target.
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set_entry_frame(cgen()->frame());
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}
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if (entry_label_.is_bound()) {
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// You can't branch backwards to an already bound label unless you admitted
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// up front that this was a bidirectional jump target. Bidirectional jump
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// targets will zap their type info when bound in case some later virtual
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// frame with less precise type info branches to them.
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ASSERT(direction_ != FORWARD_ONLY);
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}
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__ b(cc, &entry_label_);
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if (cc == al) {
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cgen()->DeleteFrame();
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}
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}
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void JumpTarget::Call() {
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// Call is used to push the address of the catch block on the stack as
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// a return address when compiling try/catch and try/finally. We
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// fully spill the frame before making the call. The expected frame
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// at the label (which should be the only one) is the spilled current
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// frame plus an in-memory return address. The "fall-through" frame
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// at the return site is the spilled current frame.
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ASSERT(cgen()->has_valid_frame());
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// There are no non-frame references across the call.
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ASSERT(cgen()->HasValidEntryRegisters());
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ASSERT(!is_linked());
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// Calls are always 'forward' so we use a copy of the current frame (plus
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// one for a return address) as the expected frame.
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ASSERT(!entry_frame_set_);
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VirtualFrame target_frame = *cgen()->frame();
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target_frame.Adjust(1);
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set_entry_frame(&target_frame);
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__ bl(&entry_label_);
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}
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void JumpTarget::DoBind() {
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ASSERT(!is_bound());
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// Live non-frame registers are not allowed at the start of a basic
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// block.
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ASSERT(!cgen()->has_valid_frame() || cgen()->HasValidEntryRegisters());
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if (cgen()->has_valid_frame()) {
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if (direction_ != FORWARD_ONLY) cgen()->frame()->ForgetTypeInfo();
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// If there is a current frame we can use it on the fall through.
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if (!entry_frame_set_) {
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entry_frame_ = *cgen()->frame();
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entry_frame_set_ = true;
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} else {
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cgen()->frame()->MergeTo(&entry_frame_);
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}
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} else {
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// If there is no current frame we must have an entry frame which we can
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// copy.
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ASSERT(entry_frame_set_);
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RegisterFile empty;
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cgen()->SetFrame(new VirtualFrame(&entry_frame_), &empty);
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}
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__ bind(&entry_label_);
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}
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#undef __
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} } // namespace v8::internal
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#endif // V8_TARGET_ARCH_ARM
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