1 | // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file |
2 | // for details. All rights reserved. Use of this source code is governed by a |
3 | // BSD-style license that can be found in the LICENSE file. |
4 | |
5 | #include "vm/globals.h" |
6 | #if defined(TARGET_ARCH_IA32) |
7 | |
8 | #include "vm/debugger.h" |
9 | |
10 | #include "vm/code_patcher.h" |
11 | #include "vm/compiler/assembler/disassembler.h" |
12 | #include "vm/cpu.h" |
13 | #include "vm/object.h" |
14 | #include "vm/os.h" |
15 | #include "vm/stack_frame.h" |
16 | #include "vm/stub_code.h" |
17 | |
18 | namespace dart { |
19 | |
20 | #ifndef PRODUCT |
21 | |
22 | CodePtr CodeBreakpoint::OrigStubAddress() const { |
23 | return saved_value_; |
24 | } |
25 | |
26 | void CodeBreakpoint::PatchCode() { |
27 | ASSERT(!is_enabled_); |
28 | auto thread = Thread::Current(); |
29 | auto zone = thread->zone(); |
30 | const Code& code = Code::Handle(zone, code_); |
31 | const Instructions& instrs = Instructions::Handle(zone, code.instructions()); |
32 | Code& stub_target = Code::Handle(zone); |
33 | thread->isolate_group()->RunWithStoppedMutators([&]() { |
34 | WritableInstructionsScope writable(instrs.PayloadStart(), instrs.Size()); |
35 | switch (breakpoint_kind_) { |
36 | case PcDescriptorsLayout::kIcCall: { |
37 | stub_target = StubCode::ICCallBreakpoint().raw(); |
38 | break; |
39 | } |
40 | case PcDescriptorsLayout::kUnoptStaticCall: { |
41 | stub_target = StubCode::UnoptStaticCallBreakpoint().raw(); |
42 | break; |
43 | } |
44 | case PcDescriptorsLayout::kRuntimeCall: { |
45 | saved_value_ = CodePatcher::GetStaticCallTargetAt(pc_, code); |
46 | stub_target = StubCode::RuntimeCallBreakpoint().raw(); |
47 | break; |
48 | } |
49 | default: |
50 | UNREACHABLE(); |
51 | } |
52 | saved_value_ = CodePatcher::GetStaticCallTargetAt(pc_, code); |
53 | CodePatcher::PatchStaticCallAt(pc_, code, stub_target); |
54 | }); |
55 | is_enabled_ = true; |
56 | } |
57 | |
58 | void CodeBreakpoint::RestoreCode() { |
59 | ASSERT(is_enabled_); |
60 | auto thread = Thread::Current(); |
61 | auto zone = thread->zone(); |
62 | const Code& code = Code::Handle(zone, code_); |
63 | const Instructions& instrs = Instructions::Handle(zone, code.instructions()); |
64 | thread->isolate_group()->RunWithStoppedMutators([&]() { |
65 | WritableInstructionsScope writable(instrs.PayloadStart(), instrs.Size()); |
66 | switch (breakpoint_kind_) { |
67 | case PcDescriptorsLayout::kIcCall: |
68 | case PcDescriptorsLayout::kUnoptStaticCall: |
69 | case PcDescriptorsLayout::kRuntimeCall: { |
70 | CodePatcher::PatchStaticCallAt(pc_, code, Code::Handle(saved_value_)); |
71 | break; |
72 | } |
73 | default: |
74 | UNREACHABLE(); |
75 | } |
76 | }); |
77 | is_enabled_ = false; |
78 | } |
79 | |
80 | #endif // !PRODUCT |
81 | |
82 | } // namespace dart |
83 | |
84 | #endif // defined TARGET_ARCH_IA32 |
85 | |