bc77d4d60a
Introduce API to temporarily interrupt long running JavaScript code. It is different from termination API as interrupted JavaScript will continue to execute normally when registered InterruptCallback returns. /** * Request V8 to interrupt long running JavaScript code and invoke * the given |callback| passing the given |data| to it. After |callback| * returns control will be returned to the JavaScript code. * At any given moment V8 can remember only a single callback for the very * last interrupt request. * Can be called from another thread without acquiring a |Locker|. * Registered |callback| must not reenter interrupted Isolate. */ void RequestInterrupt(InterruptCallback callback, void* data); /** * Clear interrupt request created by |RequestInterrupt|. * Can be called from another thread without acquiring a |Locker|. */ void ClearInterrupt(); Fix Hydrogen SCE pass to avoid eliminating stack guards too aggressively. Only normal JavaScript functions are guaranteed to have stack guard in the prologue. If function is a builtin or has a custom call IC it will lack one. Changes from r18363: - includes r18364 to fix compilation errors: removes debugging only code; - makes interrupiton related tests not threaded, because they rely on having exclusive access to the V8 instance and the fact that they can only interrupt themselves, if they are interrupted from the outside they break; - changes HasStackCheck predicate used during SCE pass to avoid handles dereference to make SCE compatible with parallel recompilation. R=dcarney@chromium.org Review URL: https://codereview.chromium.org/104823008 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18375 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
63 lines
2.6 KiB
C++
63 lines
2.6 KiB
C++
// Copyright 2013 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 "hydrogen-sce.h"
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#include "v8.h"
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namespace v8 {
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namespace internal {
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void HStackCheckEliminationPhase::Run() {
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// For each loop block walk the dominator tree from the backwards branch to
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// the loop header. If a call instruction is encountered the backwards branch
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// is dominated by a call and the stack check in the backwards branch can be
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// removed.
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for (int i = 0; i < graph()->blocks()->length(); i++) {
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HBasicBlock* block = graph()->blocks()->at(i);
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if (block->IsLoopHeader()) {
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HBasicBlock* back_edge = block->loop_information()->GetLastBackEdge();
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HBasicBlock* dominator = back_edge;
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while (true) {
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for (HInstructionIterator it(dominator); !it.Done(); it.Advance()) {
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if (it.Current()->HasStackCheck()) {
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block->loop_information()->stack_check()->Eliminate();
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break;
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}
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}
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// Done when the loop header is processed.
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if (dominator == block) break;
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// Move up the dominator tree.
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dominator = dominator->dominator();
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}
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}
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}
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}
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} } // namespace v8::internal
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