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![Alexander Markov](/assets/img/avatar_default.png)
This is a preparation for removal of Code objects. Issue: https://github.com/dart-lang/sdk/issues/44852 TEST=ci Change-Id: I9765945731c91fbdac647cc448d021238f129880 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/182361 Reviewed-by: Martin Kustermann <kustermann@google.com> Commit-Queue: Alexander Markov <alexmarkov@google.com>
295 lines
9.1 KiB
C++
295 lines
9.1 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/globals.h" // Needed here to get TARGET_ARCH_IA32.
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#if defined(TARGET_ARCH_IA32)
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#include "platform/unaligned.h"
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#include "vm/code_patcher.h"
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#include "vm/cpu.h"
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#include "vm/dart_entry.h"
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#include "vm/instructions.h"
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#include "vm/object.h"
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#include "vm/raw_object.h"
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namespace dart {
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// The expected pattern of a Dart unoptimized call (static and instance):
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// mov ECX, ic-data
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// mov EDI, target-code-object
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// call target_address (stub)
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// <- return address
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class UnoptimizedCall : public ValueObject {
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public:
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explicit UnoptimizedCall(uword return_address)
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: start_(return_address - kPatternSize) {
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ASSERT(IsValid());
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}
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ObjectPtr ic_data() const {
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return *reinterpret_cast<ObjectPtr*>(start_ + 1);
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}
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static const int kMovInstructionSize = 5;
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static const int kCallInstructionSize = 3;
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static const int kPatternSize =
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2 * kMovInstructionSize + kCallInstructionSize;
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private:
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bool IsValid() {
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uint8_t* code_bytes = reinterpret_cast<uint8_t*>(start_);
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return (code_bytes[0] == 0xB9) &&
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(code_bytes[2 * kMovInstructionSize] == 0xFF);
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}
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uword return_address() const { return start_ + kPatternSize; }
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uword call_address() const { return start_ + 2 * kMovInstructionSize; }
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protected:
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uword start_;
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private:
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DISALLOW_IMPLICIT_CONSTRUCTORS(UnoptimizedCall);
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};
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class NativeCall : public UnoptimizedCall {
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public:
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explicit NativeCall(uword return_address) : UnoptimizedCall(return_address) {}
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NativeFunction native_function() const {
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return *reinterpret_cast<NativeFunction*>(start_ + 1);
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}
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void set_native_function(NativeFunction func) const {
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Thread::Current()->isolate_group()->RunWithStoppedMutators([&]() {
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WritableInstructionsScope writable(start_ + 1, sizeof(func));
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*reinterpret_cast<NativeFunction*>(start_ + 1) = func;
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});
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}
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private:
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DISALLOW_IMPLICIT_CONSTRUCTORS(NativeCall);
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};
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// b9xxxxxxxx mov ecx,<data>
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// bfyyyyyyyy mov edi,<target>
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// ff5707 call [edi+<monomorphic-entry-offset>]
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class InstanceCall : public UnoptimizedCall {
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public:
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explicit InstanceCall(uword return_address)
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: UnoptimizedCall(return_address) {
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#if defined(DEBUG)
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Object& test_data = Object::Handle(data());
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ASSERT(test_data.IsArray() || test_data.IsICData() ||
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test_data.IsMegamorphicCache());
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if (test_data.IsICData()) {
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ASSERT(ICData::Cast(test_data).NumArgsTested() > 0);
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}
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#endif // DEBUG
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}
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ObjectPtr data() const {
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return LoadUnaligned(reinterpret_cast<ObjectPtr*>(start_ + 1));
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}
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void set_data(const Object& data) const {
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StoreUnaligned(reinterpret_cast<ObjectPtr*>(start_ + 1), data.ptr());
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}
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CodePtr target() const {
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return LoadUnaligned(reinterpret_cast<CodePtr*>(start_ + 6));
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}
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void set_target(const Code& target) const {
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StoreUnaligned(reinterpret_cast<CodePtr*>(start_ + 6), target.ptr());
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}
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private:
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DISALLOW_IMPLICIT_CONSTRUCTORS(InstanceCall);
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};
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class UnoptimizedStaticCall : public UnoptimizedCall {
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public:
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explicit UnoptimizedStaticCall(uword return_address)
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: UnoptimizedCall(return_address) {
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#if defined(DEBUG)
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ICData& test_ic_data = ICData::Handle();
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test_ic_data ^= ic_data();
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ASSERT(test_ic_data.NumArgsTested() >= 0);
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#endif // DEBUG
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}
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private:
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DISALLOW_IMPLICIT_CONSTRUCTORS(UnoptimizedStaticCall);
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};
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// The expected pattern of a dart static call:
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// mov EDX, arguments_descriptor_array (optional in polymorphic calls)
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// mov EDI, Immediate(code_object)
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// call [EDI + entry_point_offset]
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// <- return address
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class StaticCall : public ValueObject {
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public:
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explicit StaticCall(uword return_address)
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: start_(return_address - (kMovInstructionSize + kCallInstructionSize)) {
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ASSERT(IsValid());
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}
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bool IsValid() {
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uint8_t* code_bytes = reinterpret_cast<uint8_t*>(start_);
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return (code_bytes[0] == 0xBF) && (code_bytes[5] == 0xFF);
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}
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CodePtr target() const {
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const uword imm = *reinterpret_cast<uword*>(start_ + 1);
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return static_cast<CodePtr>(imm);
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}
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void set_target(const Code& target) const {
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uword* target_addr = reinterpret_cast<uword*>(start_ + 1);
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uword imm = static_cast<uword>(target.ptr());
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*target_addr = imm;
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CPU::FlushICache(start_ + 1, sizeof(imm));
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}
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static const int kMovInstructionSize = 5;
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static const int kCallInstructionSize = 3;
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private:
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uword return_address() const {
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return start_ + kMovInstructionSize + kCallInstructionSize;
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}
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uword call_address() const { return start_ + kMovInstructionSize; }
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uword start_;
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DISALLOW_IMPLICIT_CONSTRUCTORS(StaticCall);
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};
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CodePtr CodePatcher::GetStaticCallTargetAt(uword return_address,
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const Code& code) {
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ASSERT(code.ContainsInstructionAt(return_address));
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StaticCall call(return_address);
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return call.target();
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}
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void CodePatcher::PatchStaticCallAt(uword return_address,
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const Code& code,
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const Code& new_target) {
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auto thread = Thread::Current();
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auto zone = thread->zone();
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const Instructions& instrs = Instructions::Handle(zone, code.instructions());
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thread->isolate_group()->RunWithStoppedMutators([&]() {
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WritableInstructionsScope writable(instrs.PayloadStart(), instrs.Size());
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ASSERT(code.ContainsInstructionAt(return_address));
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StaticCall call(return_address);
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call.set_target(new_target);
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});
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}
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void CodePatcher::InsertDeoptimizationCallAt(uword start) {
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UNREACHABLE();
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}
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CodePtr CodePatcher::GetInstanceCallAt(uword return_address,
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const Code& caller_code,
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Object* data) {
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ASSERT(caller_code.ContainsInstructionAt(return_address));
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InstanceCall call(return_address);
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if (data != NULL) {
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*data = call.data();
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}
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return call.target();
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}
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void CodePatcher::PatchInstanceCallAt(uword return_address,
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const Code& caller_code,
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const Object& data,
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const Code& target) {
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auto thread = Thread::Current();
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thread->isolate_group()->RunWithStoppedMutators([&]() {
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PatchInstanceCallAtWithMutatorsStopped(thread, return_address, caller_code,
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data, target);
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});
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}
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void CodePatcher::PatchInstanceCallAtWithMutatorsStopped(
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Thread* thread,
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uword return_address,
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const Code& caller_code,
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const Object& data,
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const Code& target) {
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auto zone = thread->zone();
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ASSERT(caller_code.ContainsInstructionAt(return_address));
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const Instructions& instrs =
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Instructions::Handle(zone, caller_code.instructions());
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WritableInstructionsScope writable(instrs.PayloadStart(), instrs.Size());
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InstanceCall call(return_address);
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call.set_data(data);
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call.set_target(target);
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}
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FunctionPtr CodePatcher::GetUnoptimizedStaticCallAt(uword return_address,
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const Code& caller_code,
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ICData* ic_data_result) {
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ASSERT(caller_code.ContainsInstructionAt(return_address));
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UnoptimizedStaticCall static_call(return_address);
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ICData& ic_data = ICData::Handle();
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ic_data ^= static_call.ic_data();
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if (ic_data_result != NULL) {
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*ic_data_result = ic_data.ptr();
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}
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return ic_data.GetTargetAt(0);
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}
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void CodePatcher::PatchSwitchableCallAt(uword return_address,
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const Code& caller_code,
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const Object& data,
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const Code& target) {
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// Switchable instance calls only generated for precompilation.
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UNREACHABLE();
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}
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void CodePatcher::PatchSwitchableCallAtWithMutatorsStopped(
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Thread* thread,
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uword return_address,
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const Code& caller_code,
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const Object& data,
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const Code& target) {
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// Switchable instance calls only generated for precompilation.
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UNREACHABLE();
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}
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uword CodePatcher::GetSwitchableCallTargetEntryAt(uword return_address,
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const Code& caller_code) {
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// Switchable instance calls only generated for precompilation.
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UNREACHABLE();
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return 0;
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}
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ObjectPtr CodePatcher::GetSwitchableCallDataAt(uword return_address,
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const Code& caller_code) {
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// Switchable instance calls only generated for precompilation.
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UNREACHABLE();
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return Object::null();
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}
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void CodePatcher::PatchNativeCallAt(uword return_address,
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const Code& caller_code,
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NativeFunction target,
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const Code& trampoline) {
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UNREACHABLE();
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}
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CodePtr CodePatcher::GetNativeCallAt(uword return_address,
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const Code& caller_code,
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NativeFunction* target) {
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UNREACHABLE();
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return NULL;
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}
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} // namespace dart
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#endif // defined TARGET_ARCH_IA32
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