Ryan Macnak
c77f3db89c
Needed to be able to update call sites without pausing Dart execution. TEST=ci Change-Id: I8dd6e5cc4bec617da3c1198c6064cefbe86dbec2 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/441721 Commit-Queue: Ryan Macnak <rmacnak@google.com> Reviewed-by: Alexander Aprelev <aam@google.com>
77 lines
2.3 KiB
C++
77 lines
2.3 KiB
C++
// Copyright (c) 2011, 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"
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#if defined(TARGET_ARCH_X64)
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#include "vm/debugger.h"
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#include "vm/code_patcher.h"
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#include "vm/cpu.h"
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#include "vm/instructions.h"
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#include "vm/stub_code.h"
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namespace dart {
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#ifndef PRODUCT
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CodePtr CodeBreakpoint::OrigStubAddress() const {
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return saved_value_;
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}
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void CodeBreakpoint::PatchCode() {
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ASSERT(!IsEnabled());
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const Code& code = Code::Handle(code_);
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switch (breakpoint_kind_) {
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case UntaggedPcDescriptors::kIcCall: {
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Object& data = Object::Handle();
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saved_value_ = CodePatcher::GetInstanceCallAt(pc_, code, &data);
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CodePatcher::PatchInstanceCallAt(pc_, code, data,
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StubCode::ICCallBreakpoint());
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break;
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}
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case UntaggedPcDescriptors::kUnoptStaticCall:
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saved_value_ = CodePatcher::GetStaticCallTargetAt(pc_, code);
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CodePatcher::PatchStaticCallAt(pc_, code,
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StubCode::UnoptStaticCallBreakpoint());
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break;
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case UntaggedPcDescriptors::kRuntimeCall:
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saved_value_ = CodePatcher::GetStaticCallTargetAt(pc_, code);
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CodePatcher::PatchPoolPointerCallAt(pc_, code,
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StubCode::RuntimeCallBreakpoint());
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break;
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default:
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UNREACHABLE();
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}
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}
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void CodeBreakpoint::RestoreCode() {
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ASSERT(IsEnabled());
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const Code& code = Code::Handle(code_);
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switch (breakpoint_kind_) {
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case UntaggedPcDescriptors::kIcCall: {
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Object& data = Object::Handle();
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CodePatcher::GetInstanceCallAt(pc_, code, &data);
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CodePatcher::PatchInstanceCallAt(pc_, code, data,
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Code::Handle(saved_value_));
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break;
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}
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case UntaggedPcDescriptors::kUnoptStaticCall:
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CodePatcher::PatchStaticCallAt(pc_, code, Code::Handle(saved_value_));
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break;
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case UntaggedPcDescriptors::kRuntimeCall:
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CodePatcher::PatchPoolPointerCallAt(pc_, code,
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Code::Handle(saved_value_));
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break;
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default:
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UNREACHABLE();
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}
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}
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#endif // !PRODUCT
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} // namespace dart
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#endif // defined TARGET_ARCH_X64
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