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 "compiler.h"
18
19 #include <android-base/logging.h>
20
21 #include "base/macros.h"
22 #include "base/utils.h"
23 #include "dex/code_item_accessors-inl.h"
24 #include "driver/compiler_driver.h"
25 #include "optimizing/optimizing_compiler.h"
26
27 namespace art {
28
Create(CompilerDriver * driver,Compiler::Kind kind)29 Compiler* Compiler::Create(CompilerDriver* driver, Compiler::Kind kind) {
30 switch (kind) {
31 case kQuick:
32 // TODO: Remove Quick in options.
33 case kOptimizing:
34 return CreateOptimizingCompiler(driver);
35
36 default:
37 LOG(FATAL) << "UNREACHABLE";
38 UNREACHABLE();
39 }
40 }
41
IsPathologicalCase(const DexFile::CodeItem & code_item,uint32_t method_idx,const DexFile & dex_file)42 bool Compiler::IsPathologicalCase(const DexFile::CodeItem& code_item,
43 uint32_t method_idx,
44 const DexFile& dex_file) {
45 /*
46 * Skip compilation for pathologically large methods - either by instruction count or num vregs.
47 * Dalvik uses 16-bit uints for instruction and register counts. We'll limit to a quarter
48 * of that, which also guarantees we cannot overflow our 16-bit internal Quick SSA name space.
49 */
50 CodeItemDataAccessor accessor(dex_file, &code_item);
51 if (accessor.InsnsSizeInCodeUnits() >= UINT16_MAX / 4) {
52 LOG(INFO) << "Method exceeds compiler instruction limit: "
53 << accessor.InsnsSizeInCodeUnits()
54 << " in " << dex_file.PrettyMethod(method_idx);
55 return true;
56 }
57 if (accessor.RegistersSize() >= UINT16_MAX / 4) {
58 LOG(INFO) << "Method exceeds compiler virtual register limit: "
59 << accessor.RegistersSize() << " in " << dex_file.PrettyMethod(method_idx);
60 return true;
61 }
62 return false;
63 }
64
65 } // namespace art
66