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