2b63d5d093
Now that we are able to compact map space, we can also get rid of the map space and allocate maps in the old space instead. This CL introduces a FLAG_map_space for enabling/disabling the map space but the map space remains enabled by default for now. Without a separate space for maps, the GC can't prevent relocation of maps anymore. Therefore this CL always allows compaction of maps when running without a map space. Rename flag to --compact-maps to better fit this scenario. mkgrokdump and debug_helper also need to be updated to look for maps also in the old space. The map space is now optional. Bug: v8:12578 Change-Id: Ic4e4abd0b58bee26e64329b1c92dbccb07d8105a Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3424483 Reviewed-by: Michael Lippautz <mlippautz@chromium.org> Reviewed-by: Seth Brenith <seth.brenith@microsoft.com> Reviewed-by: Leszek Swirski <leszeks@chromium.org> Commit-Queue: Dominik Inführ <dinfuehr@chromium.org> Cr-Commit-Position: refs/heads/main@{#79165}
73 lines
2.4 KiB
C++
73 lines
2.4 KiB
C++
// Copyright 2019 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_TOOLS_DEBUG_HELPER_HEAP_CONSTANTS_H_
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#define V8_TOOLS_DEBUG_HELPER_HEAP_CONSTANTS_H_
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#include <cstdint>
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#include <string>
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#include <vector>
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#include "debug-helper.h"
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#include "src/objects/instance-type.h"
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namespace d = v8::debug_helper;
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namespace v8 {
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namespace internal {
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namespace debug_helper_internal {
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// ===== Functions generated by gen-heap-constants.py: =========================
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// Returns the name of a known object, given its offset within the first page of
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// the space, or empty string on failure.
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std::string FindKnownObjectInOldSpace(uintptr_t offset);
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std::string FindKnownObjectInReadOnlySpace(uintptr_t offset);
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std::string FindKnownObjectInMapSpace(uintptr_t offset);
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// In builds with pointer compression enabled, sets the *_first_page members in
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// the HeapAddresses object. In other builds, does nothing.
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void FillInUnknownHeapAddresses(d::HeapAddresses* heap_addresses,
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uintptr_t any_uncompressed_ptr);
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// Returns the instance type for the known Map, given its offset within the
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// first page of the space, or empty string on failure.
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int FindKnownMapInstanceTypeInMapSpace(uintptr_t offset);
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int FindKnownMapInstanceTypeInOldSpace(uintptr_t offset);
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int FindKnownMapInstanceTypeInReadOnlySpace(uintptr_t offset);
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// ===== End of generated functions. ===========================================
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// Returns a descriptive string if the given address matches a known object, or
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// an empty string otherwise.
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std::string FindKnownObject(uintptr_t address,
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const d::HeapAddresses& heap_addresses);
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struct KnownInstanceType {
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enum class Confidence {
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kLow,
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kHigh,
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};
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KnownInstanceType() : confidence(Confidence::kLow) {}
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KnownInstanceType(int type) : KnownInstanceType() {
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if (type >= 0) {
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confidence = Confidence::kHigh;
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types.push_back(static_cast<v8::internal::InstanceType>(type));
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}
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}
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Confidence confidence;
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std::vector<v8::internal::InstanceType> types;
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};
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// Returns information about the instance type of the Map at the given address,
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// based on the list of known Maps.
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KnownInstanceType FindKnownMapInstanceTypes(
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uintptr_t address, const d::HeapAddresses& heap_addresses);
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} // namespace debug_helper_internal
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} // namespace internal
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} // namespace v8
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#endif
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