2011-04-01 19:46:21 +00:00
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// Copyright 2011 the V8 project authors. All rights reserved.
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2008-07-03 15:10:15 +00:00
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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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2011-03-18 20:35:07 +00:00
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#include "isolate.h"
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2008-07-03 15:10:15 +00:00
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#include "bootstrapper.h"
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#include "debug.h"
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2010-12-07 11:31:57 +00:00
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#include "deoptimizer.h"
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#include "heap-profiler.h"
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#include "hydrogen.h"
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#include "lithium-allocator.h"
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#include "log.h"
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#include "runtime-profiler.h"
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2008-07-03 15:10:15 +00:00
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#include "serialize.h"
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2009-05-25 10:05:56 +00:00
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namespace v8 {
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namespace internal {
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2008-07-03 15:10:15 +00:00
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2011-03-31 16:17:37 +00:00
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static Mutex* init_once_mutex = OS::CreateMutex();
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static bool init_once_called = false;
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2009-05-25 19:39:52 +00:00
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bool V8::is_running_ = false;
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2008-07-03 15:10:15 +00:00
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bool V8::has_been_setup_ = false;
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bool V8::has_been_disposed_ = false;
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2009-05-25 19:39:52 +00:00
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bool V8::has_fatal_error_ = false;
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2010-12-07 11:31:57 +00:00
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bool V8::use_crankshaft_ = true;
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2008-07-03 15:10:15 +00:00
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2010-11-16 08:01:45 +00:00
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2010-03-17 14:53:16 +00:00
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bool V8::Initialize(Deserializer* des) {
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2011-03-31 16:17:37 +00:00
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InitializeOncePerProcess();
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2011-03-18 20:35:07 +00:00
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// The current thread may not yet had entered an isolate to run.
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// Note the Isolate::Current() may be non-null because for various
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// initialization purposes an initializing thread may be assigned an isolate
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// but not actually enter it.
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if (i::Isolate::CurrentPerIsolateThreadData() == NULL) {
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i::Isolate::EnterDefaultIsolate();
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}
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ASSERT(i::Isolate::CurrentPerIsolateThreadData() != NULL);
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2011-04-11 23:46:22 +00:00
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ASSERT(i::Isolate::CurrentPerIsolateThreadData()->thread_id().Equals(
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i::ThreadId::Current()));
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2011-03-18 20:35:07 +00:00
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ASSERT(i::Isolate::CurrentPerIsolateThreadData()->isolate() ==
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i::Isolate::Current());
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if (IsDead()) return false;
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Isolate* isolate = Isolate::Current();
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if (isolate->IsInitialized()) return true;
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2009-05-25 19:39:52 +00:00
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is_running_ = true;
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2008-07-03 15:10:15 +00:00
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has_been_setup_ = true;
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2009-05-25 19:39:52 +00:00
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has_fatal_error_ = false;
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has_been_disposed_ = false;
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2008-07-03 15:10:15 +00:00
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2011-03-18 20:35:07 +00:00
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return isolate->Init(des);
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2008-07-03 15:10:15 +00:00
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}
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2009-05-25 19:39:52 +00:00
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void V8::SetFatalError() {
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is_running_ = false;
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has_fatal_error_ = true;
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}
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2008-07-03 15:10:15 +00:00
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void V8::TearDown() {
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2011-03-18 20:35:07 +00:00
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Isolate* isolate = Isolate::Current();
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ASSERT(isolate->IsDefaultIsolate());
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2011-03-18 19:41:05 +00:00
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2011-03-18 20:35:07 +00:00
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if (!has_been_setup_ || has_been_disposed_) return;
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isolate->TearDown();
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2010-12-07 11:01:02 +00:00
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2009-05-25 19:39:52 +00:00
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is_running_ = false;
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2008-07-03 15:10:15 +00:00
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has_been_disposed_ = true;
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}
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2009-05-25 19:39:52 +00:00
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2010-03-24 10:32:23 +00:00
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static uint32_t random_seed() {
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if (FLAG_random_seed == 0) {
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return random();
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}
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return FLAG_random_seed;
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}
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2010-11-18 08:23:49 +00:00
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typedef struct {
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uint32_t hi;
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uint32_t lo;
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} random_state;
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2009-06-15 08:04:47 +00:00
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2010-11-18 08:23:49 +00:00
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// Random number generator using George Marsaglia's MWC algorithm.
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static uint32_t random_base(random_state *state) {
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// Initialize seed using the system random(). If one of the seeds
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// should ever become zero again, or if random() returns zero, we
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// avoid getting stuck with zero bits in hi or lo by re-initializing
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// them on demand.
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2010-11-18 08:23:49 +00:00
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if (state->hi == 0) state->hi = random_seed();
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if (state->lo == 0) state->lo = random_seed();
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2009-06-15 08:04:47 +00:00
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// Mix the bits.
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state->hi = 36969 * (state->hi & 0xFFFF) + (state->hi >> 16);
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state->lo = 18273 * (state->lo & 0xFFFF) + (state->lo >> 16);
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return (state->hi << 16) + (state->lo & 0xFFFF);
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}
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// Used by JavaScript APIs
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uint32_t V8::Random(Isolate* isolate) {
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ASSERT(isolate == Isolate::Current());
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// TODO(isolates): move lo and hi to isolate
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static random_state state = {0, 0};
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return random_base(&state);
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}
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// Used internally by the JIT and memory allocator for security
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// purposes. So, we keep a different state to prevent informations
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// leaks that could be used in an exploit.
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2011-03-18 20:35:07 +00:00
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uint32_t V8::RandomPrivate(Isolate* isolate) {
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ASSERT(isolate == Isolate::Current());
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// TODO(isolates): move lo and hi to isolate
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static random_state state = {0, 0};
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return random_base(&state);
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2009-06-15 08:04:47 +00:00
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}
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2009-08-20 08:12:30 +00:00
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2009-10-06 00:06:17 +00:00
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bool V8::IdleNotification() {
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2009-10-02 17:26:50 +00:00
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// Returning true tells the caller that there is no need to call
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// IdleNotification again.
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if (!FLAG_use_idle_notification) return true;
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2009-08-13 12:03:42 +00:00
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2009-08-25 02:54:39 +00:00
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// Tell the heap that it may want to adjust.
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2011-03-18 20:35:07 +00:00
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return HEAP->IdleNotification();
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2009-08-13 09:35:51 +00:00
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}
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2010-04-07 08:18:51 +00:00
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// Use a union type to avoid type-aliasing optimizations in GCC.
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typedef union {
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double double_value;
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uint64_t uint64_t_value;
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} double_int_union;
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2011-03-30 18:05:16 +00:00
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Object* V8::FillHeapNumberWithRandom(Object* heap_number, Isolate* isolate) {
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uint64_t random_bits = Random(isolate);
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2010-04-07 08:18:51 +00:00
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// Make a double* from address (heap_number + sizeof(double)).
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double_int_union* r = reinterpret_cast<double_int_union*>(
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reinterpret_cast<char*>(heap_number) +
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HeapNumber::kValueOffset - kHeapObjectTag);
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2010-04-12 10:07:50 +00:00
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// Convert 32 random bits to 0.(32 random bits) in a double
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// by computing:
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// ( 1.(20 0s)(32 random bits) x 2^20 ) - (1.0 x 2^20)).
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const double binary_million = 1048576.0;
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r->double_value = binary_million;
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r->uint64_t_value |= random_bits;
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r->double_value -= binary_million;
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2010-04-07 08:18:51 +00:00
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return heap_number;
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2009-06-15 08:04:47 +00:00
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}
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2011-03-31 16:17:37 +00:00
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void V8::InitializeOncePerProcess() {
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ScopedLock lock(init_once_mutex);
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if (init_once_called) return;
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init_once_called = true;
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// Setup the platform OS support.
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OS::Setup();
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2011-04-01 14:38:30 +00:00
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use_crankshaft_ = FLAG_crankshaft;
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2011-03-31 16:17:37 +00:00
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if (Serializer::enabled()) {
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use_crankshaft_ = false;
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}
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CPU::Setup();
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if (!CPU::SupportsCrankshaft()) {
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use_crankshaft_ = false;
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}
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2011-04-12 19:15:53 +00:00
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RuntimeProfiler::GlobalSetup();
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2011-03-31 16:17:37 +00:00
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// Peephole optimization might interfere with deoptimization.
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FLAG_peephole_optimization = !use_crankshaft_;
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}
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2008-07-03 15:10:15 +00:00
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} } // namespace v8::internal
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