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https://github.com/dart-lang/sdk
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0c481a196c
Fixes https://github.com/flutter/flutter/issues/40114 Change-Id: If8d71e9c19c2e794d29f7ecbacb87457890a2fd5 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/116883 Reviewed-by: Alexander Markov <alexmarkov@google.com> Commit-Queue: Alexander Aprelev <aam@google.com>
94 lines
3.2 KiB
C++
94 lines
3.2 KiB
C++
// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include "vm/ffi_callback_trampolines.h"
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#include "vm/code_comments.h"
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#include "vm/code_observers.h"
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#include "vm/compiler/assembler/assembler.h"
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#include "vm/compiler/assembler/disassembler.h"
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#include "vm/exceptions.h"
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namespace dart {
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DECLARE_FLAG(bool, disassemble_stubs);
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#if !defined(DART_PRECOMPILED_RUNTIME) && !defined(TARGET_ARCH_DBC)
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uword NativeCallbackTrampolines::AllocateTrampoline() {
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#if defined(DART_PRECOMPILER)
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ASSERT(!Enabled());
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UNREACHABLE();
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#else
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// Callback IDs are limited to 32-bits for trampoline compactness.
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if (kWordSize == 8 &&
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!Utils::IsInt(32, next_callback_id_ + NumCallbackTrampolinesPerPage())) {
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Exceptions::ThrowOOM();
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}
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if (trampolines_left_on_page_ == 0) {
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VirtualMemory* const memory = VirtualMemory::AllocateAligned(
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/*size=*/VirtualMemory::PageSize(),
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/*alignment=*/VirtualMemory::PageSize(),
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/*is_executable=*/false, /*name=*/"Dart VM FFI callback trampolines");
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if (memory == nullptr) {
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Exceptions::ThrowOOM();
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}
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trampoline_pages_.Add(memory);
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compiler::Assembler assembler(/*object_pool_builder=*/nullptr);
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compiler::StubCodeCompiler::GenerateJITCallbackTrampolines(
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&assembler, next_callback_id_);
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MemoryRegion region(memory->address(), memory->size());
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assembler.FinalizeInstructions(region);
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memory->Protect(VirtualMemory::kReadExecute);
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#if !defined(PRODUCT)
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const char* name = "FfiJitCallbackTrampolines";
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ASSERT(!Thread::Current()->IsAtSafepoint());
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if (CodeObservers::AreActive()) {
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const auto& comments = CreateCommentsFrom(&assembler);
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CodeCommentsWrapper wrapper(comments);
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CodeObservers::NotifyAll(name,
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/*base=*/memory->start(),
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/*prologue_offset=*/0,
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/*size=*/assembler.CodeSize(),
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/*optimized=*/false, // not really relevant
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&wrapper);
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}
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#endif
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#if !defined(PRODUCT) || defined(FORCE_INCLUDE_DISASSEMBLER)
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if (FLAG_disassemble_stubs && FLAG_support_disassembler) {
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DisassembleToStdout formatter;
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THR_Print(
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"Code for native callback trampolines "
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"[%" Pd " -> %" Pd "]: {\n",
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next_callback_id_,
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next_callback_id_ + NumCallbackTrampolinesPerPage() - 1);
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const auto& comments = CreateCommentsFrom(&assembler);
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Disassembler::Disassemble(memory->start(),
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memory->start() + assembler.CodeSize(),
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&formatter, &comments);
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}
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#endif
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next_callback_trampoline_ = memory->start();
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trampolines_left_on_page_ = NumCallbackTrampolinesPerPage();
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}
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trampolines_left_on_page_--;
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next_callback_id_++;
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const uword entrypoint = next_callback_trampoline_;
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next_callback_trampoline_ +=
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compiler::StubCodeCompiler::kNativeCallbackTrampolineSize;
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return entrypoint;
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#endif // defined(DART_PRECOMPILER)
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}
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#endif // !defined(DART_PRECOMPILED_RUNTIME) && !defined(TARGET_ARCH_DBC)
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} // namespace dart
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