1 /*
2 * Copyright (C) 2014 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 "mir_method_info.h"
18
19 #include "dex/compiler_ir.h"
20 #include "dex/quick/dex_file_method_inliner.h"
21 #include "dex/quick/dex_file_to_method_inliner_map.h"
22 #include "dex/verified_method.h"
23 #include "driver/compiler_driver.h"
24 #include "driver/dex_compilation_unit.h"
25 #include "driver/compiler_driver-inl.h"
26 #include "driver/compiler_options.h"
27 #include "mirror/class_loader.h" // Only to allow casts in Handle<ClassLoader>.
28 #include "mirror/dex_cache.h" // Only to allow casts in Handle<DexCache>.
29 #include "scoped_thread_state_change.h"
30 #include "handle_scope-inl.h"
31
32 namespace art {
33
Resolve(CompilerDriver * compiler_driver,const DexCompilationUnit * mUnit,MirMethodLoweringInfo * method_infos,size_t count)34 void MirMethodLoweringInfo::Resolve(CompilerDriver* compiler_driver,
35 const DexCompilationUnit* mUnit,
36 MirMethodLoweringInfo* method_infos, size_t count) {
37 if (kIsDebugBuild) {
38 DCHECK(method_infos != nullptr);
39 DCHECK_NE(count, 0u);
40 for (auto it = method_infos, end = method_infos + count; it != end; ++it) {
41 MirMethodLoweringInfo unresolved(it->MethodIndex(), it->GetInvokeType(), it->IsQuickened());
42 unresolved.declaring_dex_file_ = it->declaring_dex_file_;
43 unresolved.vtable_idx_ = it->vtable_idx_;
44 if (it->target_dex_file_ != nullptr) {
45 unresolved.target_dex_file_ = it->target_dex_file_;
46 unresolved.target_method_idx_ = it->target_method_idx_;
47 }
48 if (kIsDebugBuild) {
49 unresolved.CheckEquals(*it);
50 }
51 }
52 }
53
54 // We're going to resolve methods and check access in a tight loop. It's better to hold
55 // the lock and needed references once than re-acquiring them again and again.
56 ScopedObjectAccess soa(Thread::Current());
57 StackHandleScope<4> hs(soa.Self());
58 Handle<mirror::DexCache> dex_cache(hs.NewHandle(compiler_driver->GetDexCache(mUnit)));
59 Handle<mirror::ClassLoader> class_loader(
60 hs.NewHandle(compiler_driver->GetClassLoader(soa, mUnit)));
61 Handle<mirror::Class> referrer_class(hs.NewHandle(
62 compiler_driver->ResolveCompilingMethodsClass(soa, dex_cache, class_loader, mUnit)));
63 auto current_dex_cache(hs.NewHandle<mirror::DexCache>(nullptr));
64 // Even if the referrer class is unresolved (i.e. we're compiling a method without class
65 // definition) we still want to resolve methods and record all available info.
66 Runtime* const runtime = Runtime::Current();
67 const DexFile* const dex_file = mUnit->GetDexFile();
68 const bool use_jit = runtime->UseJit();
69 const VerifiedMethod* const verified_method = mUnit->GetVerifiedMethod();
70 DexFileToMethodInlinerMap* inliner_map = compiler_driver->GetMethodInlinerMap();
71 DexFileMethodInliner* default_inliner =
72 (inliner_map != nullptr) ? inliner_map->GetMethodInliner(dex_file) : nullptr;
73
74 for (auto it = method_infos, end = method_infos + count; it != end; ++it) {
75 // For quickened invokes, the dex method idx is actually the mir offset.
76 if (it->IsQuickened()) {
77 const auto* dequicken_ref = verified_method->GetDequickenIndex(it->method_idx_);
78 CHECK(dequicken_ref != nullptr);
79 it->target_dex_file_ = dequicken_ref->dex_file;
80 it->target_method_idx_ = dequicken_ref->index;
81 }
82 // Remember devirtualized invoke target and set the called method to the default.
83 MethodReference devirt_ref(it->target_dex_file_, it->target_method_idx_);
84 MethodReference* devirt_target = (it->target_dex_file_ != nullptr) ? &devirt_ref : nullptr;
85 InvokeType invoke_type = it->GetInvokeType();
86 ArtMethod* resolved_method = nullptr;
87
88 bool string_init = false;
89 if (default_inliner->IsStringInitMethodIndex(it->MethodIndex())) {
90 string_init = true;
91 invoke_type = kDirect;
92 }
93
94 if (!it->IsQuickened()) {
95 it->target_dex_file_ = dex_file;
96 it->target_method_idx_ = it->MethodIndex();
97 current_dex_cache.Assign(dex_cache.Get());
98 resolved_method = compiler_driver->ResolveMethod(soa, dex_cache, class_loader, mUnit,
99 it->target_method_idx_, invoke_type, true);
100 } else {
101 // The method index is actually the dex PC in this case.
102 // Calculate the proper dex file and target method idx.
103 CHECK(use_jit);
104 CHECK_EQ(invoke_type, kVirtual);
105 // Don't devirt if we are in a different dex file since we can't have direct invokes in
106 // another dex file unless we always put a direct / patch pointer.
107 devirt_target = nullptr;
108 current_dex_cache.Assign(runtime->GetClassLinker()->FindDexCache(*it->target_dex_file_));
109 CHECK(current_dex_cache.Get() != nullptr);
110 DexCompilationUnit cu(
111 mUnit->GetCompilationUnit(), mUnit->GetClassLoader(), mUnit->GetClassLinker(),
112 *it->target_dex_file_, nullptr /* code_item not used */, 0u /* class_def_idx not used */,
113 it->target_method_idx_, 0u /* access_flags not used */,
114 nullptr /* verified_method not used */);
115 resolved_method = compiler_driver->ResolveMethod(soa, current_dex_cache, class_loader, &cu,
116 it->target_method_idx_, invoke_type, false);
117 if (resolved_method == nullptr) {
118 // If the method is null then it should be a miranda method, in this case try
119 // re-loading it, this time as an interface method. The actual miranda method is in the
120 // vtable, but it will resolve to an interface method.
121 resolved_method = compiler_driver->ResolveMethod(
122 soa, current_dex_cache, class_loader, &cu, it->target_method_idx_, kInterface, false);
123 CHECK(resolved_method != nullptr);
124 }
125 if (resolved_method != nullptr) {
126 // Since this was a dequickened virtual, it is guaranteed to be resolved. However, it may be
127 // resolved to an interface method. If this is the case then change the invoke type to
128 // interface with the assumption that sharp_type will be kVirtual.
129 if (resolved_method->GetInvokeType() == kInterface) {
130 it->flags_ = (it->flags_ & ~(kInvokeTypeMask << kBitInvokeTypeBegin)) |
131 (static_cast<uint16_t>(kInterface) << kBitInvokeTypeBegin);
132 }
133 }
134 }
135 if (UNLIKELY(resolved_method == nullptr)) {
136 continue;
137 }
138
139 compiler_driver->GetResolvedMethodDexFileLocation(resolved_method,
140 &it->declaring_dex_file_, &it->declaring_class_idx_, &it->declaring_method_idx_);
141 if (!it->IsQuickened()) {
142 // For quickened invoke virtuals we may have desharpened to an interface method which
143 // wont give us the right method index, in this case blindly dispatch or else we can't
144 // compile the method. Converting the invoke to interface dispatch doesn't work since we
145 // have no way to get the dex method index for quickened invoke virtuals in the interface
146 // trampolines.
147 it->vtable_idx_ =
148 compiler_driver->GetResolvedMethodVTableIndex(resolved_method, invoke_type);
149 }
150
151 MethodReference target_method(it->target_dex_file_, it->target_method_idx_);
152 int fast_path_flags = compiler_driver->IsFastInvoke(
153 soa, current_dex_cache, class_loader, mUnit, referrer_class.Get(), resolved_method,
154 &invoke_type, &target_method, devirt_target, &it->direct_code_, &it->direct_method_);
155 const bool is_referrers_class = referrer_class.Get() == resolved_method->GetDeclaringClass();
156 const bool is_class_initialized =
157 compiler_driver->IsMethodsClassInitialized(referrer_class.Get(), resolved_method);
158
159 // Check if the target method is intrinsic or special.
160 InlineMethodFlags is_intrinsic_or_special = kNoInlineMethodFlags;
161 if (inliner_map != nullptr) {
162 auto* inliner = (target_method.dex_file == dex_file)
163 ? default_inliner
164 : inliner_map->GetMethodInliner(target_method.dex_file);
165 is_intrinsic_or_special = inliner->IsIntrinsicOrSpecial(target_method.dex_method_index);
166 }
167
168 uint16_t other_flags = it->flags_ &
169 ~(kFlagFastPath | kFlagIsIntrinsic | kFlagIsSpecial | kFlagClassIsInitialized |
170 (kInvokeTypeMask << kBitSharpTypeBegin));
171 it->flags_ = other_flags |
172 // String init path is a special always-fast path.
173 (fast_path_flags != 0 || string_init ? kFlagFastPath : 0u) |
174 ((is_intrinsic_or_special & kInlineIntrinsic) != 0 ? kFlagIsIntrinsic : 0u) |
175 ((is_intrinsic_or_special & kInlineSpecial) != 0 ? kFlagIsSpecial : 0u) |
176 (static_cast<uint16_t>(invoke_type) << kBitSharpTypeBegin) |
177 (is_referrers_class ? kFlagIsReferrersClass : 0u) |
178 (is_class_initialized ? kFlagClassIsInitialized : 0u);
179 it->target_dex_file_ = target_method.dex_file;
180 it->target_method_idx_ = target_method.dex_method_index;
181 it->stats_flags_ = fast_path_flags;
182 if (string_init) {
183 it->direct_code_ = 0;
184 }
185 }
186 }
187
188 } // namespace art
189