mirror of
https://github.com/archlinuxarm/PKGBUILDs.git
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205 lines
8.1 KiB
Diff
205 lines
8.1 KiB
Diff
From 7b6fbcd0a6700db498ad55db046ecda92c8ee8c1 Mon Sep 17 00:00:00 2001
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From: Nikolaos Papaspyrou <nikolaos@chromium.org>
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Date: Sun, 29 Jan 2023 17:18:08 +0100
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Subject: [PATCH] Merge: [heap] Move the Stack object from ThreadLocalTop to
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Isolate
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This is just for nodejs, do not backmerge to 11.0.
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(cherry picked from commit 1e4b71d99fea5ea6bb4bf6420585a7819872bb0f)
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> Change-Id: I026a35af3bc6999a09b21f277756d4454c086343
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> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/4152476
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> Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
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> Reviewed-by: Omer Katz <omerkatz@chromium.org>
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> Commit-Queue: Nikolaos Papaspyrou <nikolaos@chromium.org>
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> Cr-Commit-Position: refs/heads/main@{#85445}
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Stack information is thread-specific and, until now, it was stored in a
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field in ThreadLocalTop. This CL moves stack information to the isolate
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and makes sure to update the stack start whenever a main thread enters
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the isolate. At the same time, the Stack object is refactored and
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simplified.
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As a side effect, after removing the Stack object, ThreadLocalTop
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satisfies the std::standard_layout trait; this fixes some issues
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observed with different C++ compilers.
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Bug: v8:13630
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Bug: v8:13257
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Change-Id: I4be1f04fe90699e1a6e456dad3e0dd623851acce
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---
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src/execution/isolate.cc | 36 +++++++++++++++----------------
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src/execution/isolate.h | 6 ++++++
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src/execution/thread-local-top.cc | 2 --
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src/execution/thread-local-top.h | 6 +-----
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src/heap/heap.cc | 4 +---
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5 files changed, 25 insertions(+), 29 deletions(-)
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diff --git a/src/execution/isolate.cc b/src/execution/isolate.cc
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index 4edf364e0a..be4fd400d2 100644
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--- a/src/execution/isolate.cc
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+++ b/src/execution/isolate.cc
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@@ -3074,22 +3074,23 @@ void Isolate::AddSharedWasmMemory(Handle<WasmMemoryObject> memory_object) {
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void Isolate::RecordStackSwitchForScanning() {
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Object current = root(RootIndex::kActiveContinuation);
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DCHECK(!current.IsUndefined());
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- thread_local_top()->stack_.ClearStackSegments();
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- wasm::StackMemory* stack = Managed<wasm::StackMemory>::cast(
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- WasmContinuationObject::cast(current).stack())
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- .get()
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- .get();
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+ stack().ClearStackSegments();
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+ wasm::StackMemory* wasm_stack =
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+ Managed<wasm::StackMemory>::cast(
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+ WasmContinuationObject::cast(current).stack())
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+ .get()
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+ .get();
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current = WasmContinuationObject::cast(current).parent();
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- thread_local_top()->stack_.SetStackStart(
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- reinterpret_cast<void*>(stack->base()));
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+ heap()->SetStackStart(reinterpret_cast<void*>(wasm_stack->base()));
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// We don't need to add all inactive stacks. Only the ones in the active chain
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// may contain cpp heap pointers.
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while (!current.IsUndefined()) {
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auto cont = WasmContinuationObject::cast(current);
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- auto* stack = Managed<wasm::StackMemory>::cast(cont.stack()).get().get();
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- thread_local_top()->stack_.AddStackSegment(
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- reinterpret_cast<const void*>(stack->base()),
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- reinterpret_cast<const void*>(stack->jmpbuf()->sp));
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+ auto* wasm_stack =
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+ Managed<wasm::StackMemory>::cast(cont.stack()).get().get();
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+ stack().AddStackSegment(
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+ reinterpret_cast<const void*>(wasm_stack->base()),
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+ reinterpret_cast<const void*>(wasm_stack->jmpbuf()->sp));
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current = cont.parent();
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}
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}
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@@ -3377,20 +3378,13 @@ void Isolate::Delete(Isolate* isolate) {
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Isolate* saved_isolate = isolate->TryGetCurrent();
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SetIsolateThreadLocals(isolate, nullptr);
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isolate->set_thread_id(ThreadId::Current());
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- isolate->thread_local_top()->stack_ =
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- saved_isolate ? std::move(saved_isolate->thread_local_top()->stack_)
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- : ::heap::base::Stack(base::Stack::GetStackStart());
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+ isolate->heap()->SetStackStart(base::Stack::GetStackStart());
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bool owns_shared_isolate = isolate->owns_shared_isolate_;
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Isolate* maybe_shared_isolate = isolate->shared_isolate_;
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isolate->Deinit();
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- // Restore the saved isolate's stack.
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- if (saved_isolate)
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- saved_isolate->thread_local_top()->stack_ =
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- std::move(isolate->thread_local_top()->stack_);
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-
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#ifdef DEBUG
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non_disposed_isolates_--;
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#endif // DEBUG
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@@ -4647,6 +4641,10 @@ bool Isolate::Init(SnapshotData* startup_snapshot_data,
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void Isolate::Enter() {
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Isolate* current_isolate = nullptr;
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PerIsolateThreadData* current_data = CurrentPerIsolateThreadData();
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+
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+ // Set the stack start for the main thread that enters the isolate.
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+ heap()->SetStackStart(base::Stack::GetStackStart());
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+
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if (current_data != nullptr) {
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current_isolate = current_data->isolate_;
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DCHECK_NOT_NULL(current_isolate);
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diff --git a/src/execution/isolate.h b/src/execution/isolate.h
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index a32f999fe5..1cb6e10661 100644
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--- a/src/execution/isolate.h
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+++ b/src/execution/isolate.h
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@@ -32,6 +32,7 @@
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#include "src/execution/stack-guard.h"
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#include "src/handles/handles.h"
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#include "src/handles/traced-handles.h"
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+#include "src/heap/base/stack.h"
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#include "src/heap/factory.h"
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#include "src/heap/heap.h"
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#include "src/heap/read-only-heap.h"
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@@ -2022,6 +2023,8 @@ class V8_EXPORT_PRIVATE Isolate final : private HiddenFactory {
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SimulatorData* simulator_data() { return simulator_data_; }
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#endif
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+ ::heap::base::Stack& stack() { return stack_; }
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+
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#ifdef V8_ENABLE_WEBASSEMBLY
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wasm::StackMemory*& wasm_stacks() { return wasm_stacks_; }
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// Update the thread local's Stack object so that it is aware of the new stack
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@@ -2520,6 +2523,9 @@ class V8_EXPORT_PRIVATE Isolate final : private HiddenFactory {
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// The mutex only guards adding pages, the retrieval is signal safe.
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base::Mutex code_pages_mutex_;
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+ // Stack information for the main thread.
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+ ::heap::base::Stack stack_;
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+
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#ifdef V8_ENABLE_WEBASSEMBLY
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wasm::StackMemory* wasm_stacks_;
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#endif
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diff --git a/src/execution/thread-local-top.cc b/src/execution/thread-local-top.cc
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index 0d7071ddda..05cc20b8e4 100644
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--- a/src/execution/thread-local-top.cc
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+++ b/src/execution/thread-local-top.cc
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@@ -37,14 +37,12 @@ void ThreadLocalTop::Clear() {
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current_embedder_state_ = nullptr;
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failed_access_check_callback_ = nullptr;
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thread_in_wasm_flag_address_ = kNullAddress;
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- stack_ = ::heap::base::Stack();
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}
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void ThreadLocalTop::Initialize(Isolate* isolate) {
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Clear();
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isolate_ = isolate;
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thread_id_ = ThreadId::Current();
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- stack_.SetStackStart(base::Stack::GetStackStart());
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#if V8_ENABLE_WEBASSEMBLY
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thread_in_wasm_flag_address_ = reinterpret_cast<Address>(
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trap_handler::GetThreadInWasmThreadLocalAddress());
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diff --git a/src/execution/thread-local-top.h b/src/execution/thread-local-top.h
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index 43fec0a7df..989c817f31 100644
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--- a/src/execution/thread-local-top.h
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+++ b/src/execution/thread-local-top.h
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@@ -10,7 +10,6 @@
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#include "include/v8-unwinder.h"
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#include "src/common/globals.h"
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#include "src/execution/thread-id.h"
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-#include "src/heap/base/stack.h"
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#include "src/objects/contexts.h"
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#include "src/utils/utils.h"
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@@ -30,7 +29,7 @@ class ThreadLocalTop {
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// TODO(all): This is not particularly beautiful. We should probably
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// refactor this to really consist of just Addresses and 32-bit
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// integer fields.
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- static constexpr uint32_t kSizeInBytes = 30 * kSystemPointerSize;
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+ static constexpr uint32_t kSizeInBytes = 25 * kSystemPointerSize;
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// Does early low-level initialization that does not depend on the
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// isolate being present.
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@@ -147,9 +146,6 @@ class ThreadLocalTop {
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// Address of the thread-local "thread in wasm" flag.
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Address thread_in_wasm_flag_address_;
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-
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- // Stack information.
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- ::heap::base::Stack stack_;
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};
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} // namespace internal
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diff --git a/src/heap/heap.cc b/src/heap/heap.cc
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index 51a90ddcab..b5722ab6ec 100644
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--- a/src/heap/heap.cc
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+++ b/src/heap/heap.cc
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@@ -5851,9 +5851,7 @@ void Heap::SetStackStart(void* stack_start) {
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stack().SetStackStart(stack_start);
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}
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-::heap::base::Stack& Heap::stack() {
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- return isolate_->thread_local_top()->stack_;
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-}
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+::heap::base::Stack& Heap::stack() { return isolate_->stack(); }
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void Heap::RegisterExternallyReferencedObject(Address* location) {
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Object object = TracedHandles::Mark(location, TracedHandles::MarkMode::kAll);
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