1 /* 2 * Copyright (C) 2016 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_ARM_JNI_MACRO_ASSEMBLER_ARM_VIXL_H_ 18 #define ART_COMPILER_UTILS_ARM_JNI_MACRO_ASSEMBLER_ARM_VIXL_H_ 19 20 #include <android-base/logging.h> 21 22 #include "base/arena_containers.h" 23 #include "base/macros.h" 24 #include "constants_arm.h" 25 #include "offsets.h" 26 #include "utils/arm/assembler_arm_vixl.h" 27 #include "utils/arm/managed_register_arm.h" 28 #include "utils/assembler.h" 29 #include "utils/jni_macro_assembler.h" 30 31 namespace art HIDDEN { 32 namespace arm { 33 34 class ArmVIXLJNIMacroAssembler final 35 : public JNIMacroAssemblerFwd<ArmVIXLAssembler, PointerSize::k32> { 36 public: ArmVIXLJNIMacroAssembler(ArenaAllocator * allocator)37 explicit ArmVIXLJNIMacroAssembler(ArenaAllocator* allocator) 38 : JNIMacroAssemblerFwd(allocator) {} 39 ~ArmVIXLJNIMacroAssembler()40 virtual ~ArmVIXLJNIMacroAssembler() {} 41 void FinalizeCode() override; 42 43 // 44 // Overridden common assembler high-level functionality 45 // 46 47 // Emit code that will create an activation on the stack. 48 void BuildFrame(size_t frame_size, 49 ManagedRegister method_reg, 50 ArrayRef<const ManagedRegister> callee_save_regs) override; 51 52 // Emit code that will remove an activation from the stack. 53 void RemoveFrame(size_t frame_size, 54 ArrayRef<const ManagedRegister> callee_save_regs, 55 bool may_suspend) override; 56 57 void IncreaseFrameSize(size_t adjust) override; 58 void DecreaseFrameSize(size_t adjust) override; 59 60 ManagedRegister CoreRegisterWithSize(ManagedRegister src, size_t size) override; 61 62 // Store routines. 63 void Store(FrameOffset offs, ManagedRegister src, size_t size) override; 64 void Store(ManagedRegister base, MemberOffset offs, ManagedRegister src, size_t size) override; 65 void StoreRawPtr(FrameOffset dest, ManagedRegister src) override; 66 67 void StoreStackPointerToThread(ThreadOffset32 thr_offs, bool tag_sp) override; 68 69 // Load routines. 70 void Load(ManagedRegister dest, FrameOffset src, size_t size) override; 71 void Load(ManagedRegister dest, ManagedRegister base, MemberOffset offs, size_t size) override; 72 73 void LoadRawPtrFromThread(ManagedRegister dest, ThreadOffset32 offs) override; 74 75 // Copying routines. 76 void MoveArguments(ArrayRef<ArgumentLocation> dests, 77 ArrayRef<ArgumentLocation> srcs, 78 ArrayRef<FrameOffset> refs) override; 79 80 void Move(ManagedRegister dest, ManagedRegister src, size_t size) override; 81 82 void Move(ManagedRegister dest, size_t value) override; 83 84 // Sign extension. 85 void SignExtend(ManagedRegister mreg, size_t size) override; 86 87 // Zero extension. 88 void ZeroExtend(ManagedRegister mreg, size_t size) override; 89 90 // Exploit fast access in managed code to Thread::Current(). 91 void GetCurrentThread(ManagedRegister dest) override; 92 void GetCurrentThread(FrameOffset dest_offset) override; 93 94 // Decode JNI transition or local `jobject`. For (weak) global `jobject`, jump to slow path. 95 void DecodeJNITransitionOrLocalJObject(ManagedRegister reg, 96 JNIMacroLabel* slow_path, 97 JNIMacroLabel* resume) override; 98 99 // Heap::VerifyObject on src. In some cases (such as a reference to this) we 100 // know that src may not be null. 101 void VerifyObject(ManagedRegister src, bool could_be_null) override; 102 void VerifyObject(FrameOffset src, bool could_be_null) override; 103 104 // Jump to address held at [base+offset] (used for tail calls). 105 void Jump(ManagedRegister base, Offset offset) override; 106 107 // Call to address held at [base+offset]. 108 void Call(ManagedRegister base, Offset offset) override; 109 void CallFromThread(ThreadOffset32 offset) override; 110 111 // Generate fast-path for transition to Native. Go to `label` if any thread flag is set. 112 // The implementation can use `scratch_regs` which should be callee save core registers 113 // (already saved before this call) and must preserve all argument registers. 114 void TryToTransitionFromRunnableToNative( 115 JNIMacroLabel* label, ArrayRef<const ManagedRegister> scratch_regs) override; 116 117 // Generate fast-path for transition to Runnable. Go to `label` if any thread flag is set. 118 // The implementation can use `scratch_regs` which should be core argument registers 119 // not used as return registers and it must preserve the `return_reg` if any. 120 void TryToTransitionFromNativeToRunnable(JNIMacroLabel* label, 121 ArrayRef<const ManagedRegister> scratch_regs, 122 ManagedRegister return_reg) override; 123 124 // Generate suspend check and branch to `label` if there is a pending suspend request. 125 void SuspendCheck(JNIMacroLabel* label) override; 126 127 // Generate code to check if Thread::Current()->exception_ is non-null 128 // and branch to the `label` if it is. 129 void ExceptionPoll(JNIMacroLabel* label) override; 130 // Deliver pending exception. 131 void DeliverPendingException() override; 132 133 // Create a new label that can be used with Jump/Bind calls. 134 std::unique_ptr<JNIMacroLabel> CreateLabel() override; 135 // Emit an unconditional jump to the label. 136 void Jump(JNIMacroLabel* label) override; 137 // Emit a conditional jump to the label by applying a unary condition test to the GC marking flag. 138 void TestGcMarking(JNIMacroLabel* label, JNIMacroUnaryCondition cond) override; 139 // Emit a conditional jump to the label by applying a unary condition test to object's mark bit. 140 void TestMarkBit(ManagedRegister ref, JNIMacroLabel* label, JNIMacroUnaryCondition cond) override; 141 // Emit a conditional jump to label if the loaded value from specified locations is not zero. 142 void TestByteAndJumpIfNotZero(uintptr_t address, JNIMacroLabel* label) override; 143 // Code at this offset will serve as the target for the Jump call. 144 void Bind(JNIMacroLabel* label) override; 145 146 private: 147 void Copy(FrameOffset dest, FrameOffset src, size_t size); 148 void Load(ArmManagedRegister dest, vixl32::Register base, int32_t offset, size_t size); 149 150 // Set up `out_reg` to hold a `jobject` (`StackReference<Object>*` to a spilled value), 151 // or to be null if the value is null and `null_allowed`. `in_reg` holds a possibly 152 // stale reference that can be used to avoid loading the spilled value to 153 // see if the value is null. 154 void CreateJObject(ManagedRegister out_reg, 155 FrameOffset spilled_reference_offset, 156 ManagedRegister in_reg, 157 bool null_allowed); 158 159 // Used for testing. 160 ART_FRIEND_TEST(ArmVIXLAssemblerTest, VixlJniHelpers); 161 ART_FRIEND_TEST(ArmVIXLAssemblerTest, VixlLoadFromOffset); 162 ART_FRIEND_TEST(ArmVIXLAssemblerTest, VixlStoreToOffset); 163 }; 164 165 class ArmVIXLJNIMacroLabel final 166 : public JNIMacroLabelCommon<ArmVIXLJNIMacroLabel, 167 vixl32::Label, 168 InstructionSet::kArm> { 169 public: AsArm()170 vixl32::Label* AsArm() { 171 return AsPlatformLabel(); 172 } 173 }; 174 175 } // namespace arm 176 } // namespace art 177 178 #endif // ART_COMPILER_UTILS_ARM_JNI_MACRO_ASSEMBLER_ARM_VIXL_H_ 179