fd70917d52
This is a reland of f1b1ec70a6
Original change's description:
> [builtins] Remove off-heap builtins from the snapshot
>
> This CL is the final major step towards shipping off-heap-safe builtins
> embedded into the binary.
>
> Prior to snapshot serialization, we now:
> * create the embedded blob containing off-heap instruction streams,
> * use that to generate embedded.cc (containing embedded binary data),
> * replace off-heap-safe builtins with trampolines,
> * and serialize those into the final snapshot.
>
> The new RelocInfo::OFF_HEAP_TARGET kind is used to fix up trampoline
> targets on deserialization.
>
> Bug: v8:6666
> Change-Id: Ib07aea9e3bd7ecdec42291c1388b3a7453ea96ce
> Reviewed-on: https://chromium-review.googlesource.com/950775
> Commit-Queue: Jakob Gruber <jgruber@chromium.org>
> Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
> Reviewed-by: Yang Guo <yangguo@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#51960}
TBR=yangguo@chromium.org,mstarzinger@chromium.org
Cq-Include-Trybots: luci.v8.try:v8_mac64_dbg,v8_mac64_rel
Bug: v8:6666
Change-Id: Id9954af3c8195754ff3658c4603858904fcf88c4
Reviewed-on: https://chromium-review.googlesource.com/964481
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52006}
42 lines
1.4 KiB
C++
42 lines
1.4 KiB
C++
// Copyright 2018 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef V8_INSTRUCTION_STREAM_H_
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#define V8_INSTRUCTION_STREAM_H_
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#include "src/base/macros.h"
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#include "src/globals.h"
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namespace v8 {
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namespace internal {
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class Code;
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class Isolate;
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// Wraps an off-heap instruction stream.
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// TODO(jgruber,v8:6666): Remove this class.
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class InstructionStream final : public AllStatic {
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public:
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// Returns true, iff the given pc points into an off-heap instruction stream.
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static bool PcIsOffHeap(Isolate* isolate, Address pc);
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// Returns the corresponding Code object if it exists, and nullptr otherwise.
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static Code* TryLookupCode(Isolate* isolate, Address address);
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#ifdef V8_EMBEDDED_BUILTINS
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// During snapshot creation, we first create an executable off-heap area
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// containing all off-heap code. The area is guaranteed to be contiguous.
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// Note that this only applies when building the snapshot, e.g. for
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// mksnapshot. Otherwise, off-heap code is embedded directly into the binary.
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static void CreateOffHeapInstructionStream(Isolate* isolate, uint8_t** data,
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uint32_t* size);
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static void FreeOffHeapInstructionStream(uint8_t* data, uint32_t size);
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#endif
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};
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} // namespace internal
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} // namespace v8
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#endif // V8_INSTRUCTION_STREAM_H_
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