/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ART_RUNTIME_CHECK_REFERENCE_MAP_VISITOR_H_
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#define ART_RUNTIME_CHECK_REFERENCE_MAP_VISITOR_H_
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#include "art_method-inl.h"
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#include "dex/code_item_accessors-inl.h"
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#include "dex/dex_file_types.h"
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#include "oat_quick_method_header.h"
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#include "scoped_thread_state_change-inl.h"
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#include "stack.h"
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#include "stack_map.h"
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namespace art {
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// Helper class for tests checking that the compiler keeps track of dex registers
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// holding references.
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class CheckReferenceMapVisitor : public StackVisitor {
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public:
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explicit CheckReferenceMapVisitor(Thread* thread) REQUIRES_SHARED(Locks::mutator_lock_)
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: StackVisitor(thread, nullptr, StackVisitor::StackWalkKind::kIncludeInlinedFrames) {}
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bool VisitFrame() REQUIRES_SHARED(Locks::mutator_lock_) {
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ArtMethod* m = GetMethod();
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if (m->IsCalleeSaveMethod() || m->IsNative()) {
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CHECK_EQ(GetDexPc(), dex::kDexNoIndex);
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}
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if (m == nullptr || m->IsNative() || m->IsRuntimeMethod() || IsShadowFrame()) {
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return true;
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}
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LOG(INFO) << "At " << m->PrettyMethod(false);
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if (m->IsCalleeSaveMethod()) {
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LOG(WARNING) << "no PC for " << m->PrettyMethod();
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return true;
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}
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return false;
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}
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void CheckReferences(int* registers, int number_of_references, uint32_t native_pc_offset)
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REQUIRES_SHARED(Locks::mutator_lock_) {
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CHECK(GetCurrentOatQuickMethodHeader()->IsOptimized());
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CheckOptimizedMethod(registers, number_of_references, native_pc_offset);
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}
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private:
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void CheckOptimizedMethod(int* registers, int number_of_references, uint32_t native_pc_offset)
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REQUIRES_SHARED(Locks::mutator_lock_) {
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ArtMethod* m = GetMethod();
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CodeInfo code_info(GetCurrentOatQuickMethodHeader());
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StackMap stack_map = code_info.GetStackMapForNativePcOffset(native_pc_offset);
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CodeItemDataAccessor accessor(m->DexInstructionData());
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uint16_t number_of_dex_registers = accessor.RegistersSize();
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DexRegisterMap dex_register_map = code_info.GetDexRegisterMapOf(stack_map);
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DCHECK_EQ(dex_register_map.size(), number_of_dex_registers);
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uint32_t register_mask = code_info.GetRegisterMaskOf(stack_map);
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BitMemoryRegion stack_mask = code_info.GetStackMaskOf(stack_map);
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for (int i = 0; i < number_of_references; ++i) {
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int reg = registers[i];
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CHECK_LT(reg, accessor.RegistersSize());
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DexRegisterLocation location = dex_register_map[reg];
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switch (location.GetKind()) {
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case DexRegisterLocation::Kind::kNone:
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// Not set, should not be a reference.
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CHECK(false);
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break;
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case DexRegisterLocation::Kind::kInStack:
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DCHECK_EQ(location.GetValue() % kFrameSlotSize, 0);
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CHECK(stack_mask.LoadBit(location.GetValue() / kFrameSlotSize));
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break;
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case DexRegisterLocation::Kind::kInRegister:
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case DexRegisterLocation::Kind::kInRegisterHigh:
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CHECK_NE(register_mask & (1 << location.GetValue()), 0u);
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break;
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case DexRegisterLocation::Kind::kInFpuRegister:
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case DexRegisterLocation::Kind::kInFpuRegisterHigh:
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// In Fpu register, should not be a reference.
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CHECK(false);
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break;
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case DexRegisterLocation::Kind::kConstant:
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CHECK_EQ(location.GetValue(), 0);
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break;
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default:
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LOG(FATAL) << "Unexpected location kind " << location.GetKind();
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}
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}
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}
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};
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} // namespace art
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#endif // ART_RUNTIME_CHECK_REFERENCE_MAP_VISITOR_H_
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