1 /*
2 * Copyright (C) 2011 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "oat_quick_method_header.h"
18
19 #include "arch/instruction_set.h"
20 #include "art_method.h"
21 #include "dex/dex_file_types.h"
22 #include "interpreter/interpreter_mterp_impl.h"
23 #include "interpreter/mterp/nterp.h"
24 #include "nterp_helpers.h"
25 #include "scoped_thread_state_change-inl.h"
26 #include "stack_map.h"
27 #include "thread.h"
28
29 namespace art {
30
ToDexPc(ArtMethod ** frame,const uintptr_t pc,bool abort_on_failure) const31 uint32_t OatQuickMethodHeader::ToDexPc(ArtMethod** frame,
32 const uintptr_t pc,
33 bool abort_on_failure) const {
34 ArtMethod* method = *frame;
35 const void* entry_point = GetEntryPoint();
36 uint32_t sought_offset = pc - reinterpret_cast<uintptr_t>(entry_point);
37 if (method->IsNative()) {
38 return dex::kDexNoIndex;
39 } else if (IsNterpMethodHeader()) {
40 return NterpGetDexPC(frame);
41 } else {
42 DCHECK(IsOptimized());
43 CodeInfo code_info = CodeInfo::DecodeInlineInfoOnly(this);
44 StackMap stack_map = code_info.GetStackMapForNativePcOffset(sought_offset);
45 if (stack_map.IsValid()) {
46 return stack_map.GetDexPc();
47 }
48 }
49 if (abort_on_failure) {
50 LOG(FATAL) << "Failed to find Dex offset for PC offset "
51 << reinterpret_cast<void*>(sought_offset)
52 << "(PC " << reinterpret_cast<void*>(pc) << ", entry_point=" << entry_point
53 << " current entry_point=" << method->GetEntryPointFromQuickCompiledCode()
54 << ") in " << method->PrettyMethod();
55 }
56 return dex::kDexNoIndex;
57 }
58
ToNativeQuickPc(ArtMethod * method,const uint32_t dex_pc,bool is_for_catch_handler,bool abort_on_failure) const59 uintptr_t OatQuickMethodHeader::ToNativeQuickPc(ArtMethod* method,
60 const uint32_t dex_pc,
61 bool is_for_catch_handler,
62 bool abort_on_failure) const {
63 const void* entry_point = GetEntryPoint();
64 DCHECK(!method->IsNative());
65 if (IsNterpMethodHeader()) {
66 // This should only be called on an nterp frame for getting a catch handler.
67 CHECK(is_for_catch_handler);
68 return NterpGetCatchHandler();
69 }
70 DCHECK(IsOptimized());
71 // Search for the dex-to-pc mapping in stack maps.
72 CodeInfo code_info = CodeInfo::DecodeInlineInfoOnly(this);
73
74 // All stack maps are stored in the same CodeItem section, safepoint stack
75 // maps first, then catch stack maps. We use `is_for_catch_handler` to select
76 // the order of iteration.
77 StackMap stack_map =
78 LIKELY(is_for_catch_handler) ? code_info.GetCatchStackMapForDexPc(dex_pc)
79 : code_info.GetStackMapForDexPc(dex_pc);
80 if (stack_map.IsValid()) {
81 return reinterpret_cast<uintptr_t>(entry_point) +
82 stack_map.GetNativePcOffset(kRuntimeISA);
83 }
84 if (abort_on_failure) {
85 ScopedObjectAccess soa(Thread::Current());
86 LOG(FATAL) << "Failed to find native offset for dex pc 0x" << std::hex << dex_pc
87 << " in " << method->PrettyMethod();
88 }
89 return UINTPTR_MAX;
90 }
91
GetNterpMethodHeader()92 static inline OatQuickMethodHeader* GetNterpMethodHeader() {
93 if (!interpreter::IsNterpSupported()) {
94 return nullptr;
95 }
96 uintptr_t nterp_entrypoint = reinterpret_cast<uintptr_t>(interpreter::GetNterpEntryPoint());
97 uintptr_t nterp_code_pointer = (kRuntimeISA == InstructionSet::kArm)
98 // Remove the Thumb mode bit if present on ARM.
99 ? nterp_entrypoint & ~static_cast<uintptr_t>(1)
100 : nterp_entrypoint;
101 return reinterpret_cast<OatQuickMethodHeader*>(nterp_code_pointer - sizeof(OatQuickMethodHeader));
102 }
103
104 OatQuickMethodHeader* OatQuickMethodHeader::NterpMethodHeader = GetNterpMethodHeader();
105
IsNterpMethodHeader() const106 bool OatQuickMethodHeader::IsNterpMethodHeader() const {
107 return interpreter::IsNterpSupported() ? (this == NterpMethodHeader) : false;
108 }
109
110 } // namespace art
111