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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ART_RUNTIME_CHECK_REFERENCE_MAP_VISITOR_H_
#define ART_RUNTIME_CHECK_REFERENCE_MAP_VISITOR_H_
#include "art_method-inl.h"
#include "gc_map.h"
#include "scoped_thread_state_change.h"
#include "stack_map.h"
namespace art {
// Helper class for tests checking that the compiler keeps track of dex registers
// holding references.
class CheckReferenceMapVisitor : public StackVisitor {
public:
explicit CheckReferenceMapVisitor(Thread* thread) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_)
: StackVisitor(thread, nullptr, StackVisitor::StackWalkKind::kIncludeInlinedFrames) {}
bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
ArtMethod* m = GetMethod();
if (m->IsCalleeSaveMethod() || m->IsNative()) {
CHECK_EQ(GetDexPc(), DexFile::kDexNoIndex);
}
if (m == nullptr || m->IsNative() || m->IsRuntimeMethod() || IsShadowFrame()) {
return true;
}
LOG(INFO) << "At " << PrettyMethod(m, false);
if (m->IsCalleeSaveMethod()) {
LOG(WARNING) << "no PC for " << PrettyMethod(m);
return true;
}
return false;
}
void CheckReferences(int* registers, int number_of_references, uint32_t native_pc_offset)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
if (GetMethod()->IsOptimized(sizeof(void*))) {
CheckOptimizedMethod(registers, number_of_references, native_pc_offset);
} else {
CheckQuickMethod(registers, number_of_references, native_pc_offset);
}
}
private:
void CheckOptimizedMethod(int* registers, int number_of_references, uint32_t native_pc_offset)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
ArtMethod* m = GetMethod();
CodeInfo code_info = m->GetOptimizedCodeInfo();
StackMap stack_map = code_info.GetStackMapForNativePcOffset(native_pc_offset);
uint16_t number_of_dex_registers = m->GetCodeItem()->registers_size_;
DexRegisterMap dex_register_map =
code_info.GetDexRegisterMapOf(stack_map, number_of_dex_registers);
MemoryRegion stack_mask = stack_map.GetStackMask(code_info);
uint32_t register_mask = stack_map.GetRegisterMask(code_info);
for (int i = 0; i < number_of_references; ++i) {
int reg = registers[i];
CHECK(reg < m->GetCodeItem()->registers_size_);
DexRegisterLocation location =
dex_register_map.GetDexRegisterLocation(reg, number_of_dex_registers, code_info);
switch (location.GetKind()) {
case DexRegisterLocation::Kind::kNone:
// Not set, should not be a reference.
CHECK(false);
break;
case DexRegisterLocation::Kind::kInStack:
DCHECK_EQ(location.GetValue() % kFrameSlotSize, 0);
CHECK(stack_mask.LoadBit(location.GetValue() / kFrameSlotSize));
break;
case DexRegisterLocation::Kind::kInRegister:
CHECK_NE(register_mask & (1 << location.GetValue()), 0u);
break;
case DexRegisterLocation::Kind::kInFpuRegister:
// In Fpu register, should not be a reference.
CHECK(false);
break;
case DexRegisterLocation::Kind::kConstant:
CHECK_EQ(location.GetValue(), 0);
break;
default:
LOG(FATAL) << "Unexpected location kind"
<< DexRegisterLocation::PrettyDescriptor(location.GetInternalKind());
}
}
}
void CheckQuickMethod(int* registers, int number_of_references, uint32_t native_pc_offset)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
ArtMethod* m = GetMethod();
NativePcOffsetToReferenceMap map(m->GetNativeGcMap(sizeof(void*)));
const uint8_t* ref_bitmap = map.FindBitMap(native_pc_offset);
CHECK(ref_bitmap);
for (int i = 0; i < number_of_references; ++i) {
int reg = registers[i];
CHECK(reg < m->GetCodeItem()->registers_size_);
CHECK((*((ref_bitmap) + reg / 8) >> (reg % 8) ) & 0x01)
<< "Error: Reg @" << i << " is not in GC map";
}
}
};
} // namespace art
#endif // ART_RUNTIME_CHECK_REFERENCE_MAP_VISITOR_H_
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