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 #ifndef ART_COMPILER_UTILS_STACK_CHECKS_H_ 18 #define ART_COMPILER_UTILS_STACK_CHECKS_H_ 19 20 #include "instruction_set.h" 21 22 namespace art { 23 24 // Size of a frame that we definitely consider large. Anything larger than this should 25 // definitely get a stack overflow check. 26 static constexpr size_t kLargeFrameSize = 2 * KB; 27 28 // Size of a frame that should be small. Anything leaf method smaller than this should run 29 // without a stack overflow check. 30 // The constant is from experience with frameworks code. 31 static constexpr size_t kSmallFrameSize = 1 * KB; 32 33 // Determine whether a frame is small or large, used in the decision on whether to elide a 34 // stack overflow check on method entry. 35 // 36 // A frame is considered large when it's above kLargeFrameSize. FrameNeedsStackCheck(size_t size,InstructionSet isa)37static inline bool FrameNeedsStackCheck(size_t size, InstructionSet isa) { 38 return size >= kLargeFrameSize; 39 } 40 41 } // namespace art 42 43 #endif // ART_COMPILER_UTILS_STACK_CHECKS_H_ 44