Tony
57b27a7b44
- Updated conditional compilation flags throughout the runtime codebase to transition from DART_DYNAMIC_MODULES to DART_BYTECODE_INTERPRETER. - Adjusted logic in various files including object_graph_copy.cc, object_reload.cc, profiler.cc, and others to ensure compatibility with the new interpreter model. - Ensured that all references to dynamic modules are replaced with bytecode interpreter checks, maintaining functionality for interpreted code execution. - Modified stack frame handling and service-related code to align with the new interpreter architecture. - Updated tests and service implementations to reflect the changes in the runtime environment. Signed-off-by: Tony <tonylu@tony-cloud.com>
116 lines
4.0 KiB
C++
116 lines
4.0 KiB
C++
// Copyright (c) 2012, 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/code_patcher.h"
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#if defined(DART_BYTECODE_INTERPRETER)
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#include "vm/constants_kbc.h"
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#endif
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#include "vm/cpu.h"
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#include "vm/instructions.h"
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#include "vm/object.h"
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#include "vm/virtual_memory.h"
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namespace dart {
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#if defined(DART_HOST_OS_MACOS) || defined(DART_HOST_OS_MACOS_IOS)
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// On iOS even with debugger attached we must still guarantee that memory
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// is never executable and writable at the same time. On Mac OS X
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// com.apple.security.cs.allow-jit entitlement allows WX memory regions to be
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// created - but we should not rely on this entitlement to be present.
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static constexpr bool kShouldWriteProtectCodeByDefault = true;
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#else
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static constexpr bool kShouldWriteProtectCodeByDefault = false;
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#endif
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DEFINE_FLAG(bool,
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write_protect_code,
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kShouldWriteProtectCodeByDefault,
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"Write protect jitted code");
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#if defined(TARGET_ARCH_IA32)
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WritableInstructionsScope::WritableInstructionsScope(uword address,
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intptr_t size)
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: address_(address), size_(size) {
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if (FLAG_write_protect_code) {
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VirtualMemory::Protect(reinterpret_cast<void*>(address), size,
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VirtualMemory::kReadWrite);
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}
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}
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WritableInstructionsScope::~WritableInstructionsScope() {
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if (FLAG_write_protect_code) {
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VirtualMemory::WriteProtectCode(reinterpret_cast<void*>(address_), size_);
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}
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}
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#endif // defined(TARGET_ARCH_IA32)
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bool MatchesPattern(uword end, const int16_t* pattern, intptr_t size) {
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// When breaking within generated code in GDB, it may overwrite individual
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// instructions with trap instructions, which can cause this test to fail.
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//
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// Ignoring trap instructions would work well enough within GDB alone, but it
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// doesn't work in RR, because the check for the trap instruction itself will
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// cause replay to diverge from the original record.
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if (FLAG_support_rr) return true;
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uint8_t* bytes = reinterpret_cast<uint8_t*>(end - size);
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for (intptr_t i = 0; i < size; i++) {
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int16_t val = pattern[i];
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if ((val >= 0) && (val != bytes[i])) {
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return false;
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}
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}
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return true;
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}
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#if !defined(PRODUCT) && defined(DART_BYTECODE_INTERPRETER)
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uint32_t BytecodePatcher::AddBreakpointAt(uword return_address,
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const Bytecode& bytecode) {
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auto thread = Thread::Current();
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uint32_t old_opcode;
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thread->isolate_group()->RunWithStoppedMutators([&]() {
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old_opcode =
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AddBreakpointAtWithMutatorsStopped(thread, return_address, bytecode);
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});
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return old_opcode;
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}
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void BytecodePatcher::RemoveBreakpointAt(uword return_address,
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const Bytecode& bytecode,
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uint32_t opcode) {
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auto thread = Thread::Current();
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thread->isolate_group()->RunWithStoppedMutators([&]() {
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RemoveBreakpointAtWithMutatorsStopped(thread, return_address, bytecode,
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opcode);
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});
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}
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uint32_t BytecodePatcher::AddBreakpointAtWithMutatorsStopped(
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Thread* thread,
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uword return_address,
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const Bytecode& bytecode) {
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auto* const instr = reinterpret_cast<KBCInstr*>(
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bytecode.GetInstructionBefore(return_address));
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uint32_t old_opcode = *instr;
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*instr = KernelBytecode::BreakpointOpcode(instr);
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return old_opcode;
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}
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void BytecodePatcher::RemoveBreakpointAtWithMutatorsStopped(
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Thread* thread,
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uword return_address,
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const Bytecode& bytecode,
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uint32_t opcode) {
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auto* const instr = reinterpret_cast<KBCInstr*>(
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bytecode.GetInstructionBefore(return_address));
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// Must be previously enabled and not yet removed.
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ASSERT(*instr == KernelBytecode::BreakpointOpcode(
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static_cast<KernelBytecode::Opcode>(opcode)));
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*instr = opcode;
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}
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#endif // !defined(PRODUCT) && defined(DART_BYTECODE_INTERPRETER)
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} // namespace dart
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