| /* |
| * 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. |
| */ |
| |
| #include "stack.h" |
| #include <limits> |
| |
| #include "android-base/stringprintf.h" |
| |
| #include "arch/context.h" |
| #include "art_method-inl.h" |
| #include "base/callee_save_type.h" |
| #include "base/enums.h" |
| #include "base/hex_dump.h" |
| #include "dex/dex_file_types.h" |
| #include "entrypoints/entrypoint_utils-inl.h" |
| #include "entrypoints/quick/callee_save_frame.h" |
| #include "entrypoints/runtime_asm_entrypoints.h" |
| #include "gc/space/image_space.h" |
| #include "gc/space/space-inl.h" |
| #include "interpreter/mterp/nterp.h" |
| #include "interpreter/shadow_frame-inl.h" |
| #include "jit/jit.h" |
| #include "jit/jit_code_cache.h" |
| #include "linear_alloc.h" |
| #include "managed_stack.h" |
| #include "mirror/class-inl.h" |
| #include "mirror/object-inl.h" |
| #include "mirror/object_array-inl.h" |
| #include "nterp_helpers.h" |
| #include "oat_quick_method_header.h" |
| #include "obj_ptr-inl.h" |
| #include "quick/quick_method_frame_info.h" |
| #include "runtime.h" |
| #include "thread.h" |
| #include "thread_list.h" |
| |
| namespace art { |
| |
| using android::base::StringPrintf; |
| |
| static constexpr bool kDebugStackWalk = false; |
| |
| StackVisitor::StackVisitor(Thread* thread, |
| Context* context, |
| StackWalkKind walk_kind, |
| bool check_suspended) |
| : StackVisitor(thread, context, walk_kind, 0, check_suspended) {} |
| |
| StackVisitor::StackVisitor(Thread* thread, |
| Context* context, |
| StackWalkKind walk_kind, |
| size_t num_frames, |
| bool check_suspended) |
| : thread_(thread), |
| walk_kind_(walk_kind), |
| cur_shadow_frame_(nullptr), |
| cur_quick_frame_(nullptr), |
| cur_quick_frame_pc_(0), |
| cur_oat_quick_method_header_(nullptr), |
| num_frames_(num_frames), |
| cur_depth_(0), |
| cur_inline_info_(nullptr, CodeInfo()), |
| cur_stack_map_(0, StackMap()), |
| context_(context), |
| check_suspended_(check_suspended) { |
| if (check_suspended_) { |
| DCHECK(thread == Thread::Current() || thread->IsSuspended()) << *thread; |
| } |
| } |
| |
| CodeInfo* StackVisitor::GetCurrentInlineInfo() const { |
| DCHECK(!(*cur_quick_frame_)->IsNative()); |
| const OatQuickMethodHeader* header = GetCurrentOatQuickMethodHeader(); |
| if (cur_inline_info_.first != header) { |
| cur_inline_info_ = std::make_pair(header, CodeInfo::DecodeInlineInfoOnly(header)); |
| } |
| return &cur_inline_info_.second; |
| } |
| |
| StackMap* StackVisitor::GetCurrentStackMap() const { |
| DCHECK(!(*cur_quick_frame_)->IsNative()); |
| const OatQuickMethodHeader* header = GetCurrentOatQuickMethodHeader(); |
| if (cur_stack_map_.first != cur_quick_frame_pc_) { |
| uint32_t pc = header->NativeQuickPcOffset(cur_quick_frame_pc_); |
| cur_stack_map_ = std::make_pair(cur_quick_frame_pc_, |
| GetCurrentInlineInfo()->GetStackMapForNativePcOffset(pc)); |
| } |
| return &cur_stack_map_.second; |
| } |
| |
| ArtMethod* StackVisitor::GetMethod() const { |
| if (cur_shadow_frame_ != nullptr) { |
| return cur_shadow_frame_->GetMethod(); |
| } else if (cur_quick_frame_ != nullptr) { |
| if (IsInInlinedFrame()) { |
| CodeInfo* code_info = GetCurrentInlineInfo(); |
| DCHECK(walk_kind_ != StackWalkKind::kSkipInlinedFrames); |
| return GetResolvedMethod(*GetCurrentQuickFrame(), *code_info, current_inline_frames_); |
| } else { |
| return *cur_quick_frame_; |
| } |
| } |
| return nullptr; |
| } |
| |
| uint32_t StackVisitor::GetDexPc(bool abort_on_failure) const { |
| if (cur_shadow_frame_ != nullptr) { |
| return cur_shadow_frame_->GetDexPC(); |
| } else if (cur_quick_frame_ != nullptr) { |
| if (IsInInlinedFrame()) { |
| return current_inline_frames_.back().GetDexPc(); |
| } else if (cur_oat_quick_method_header_ == nullptr) { |
| return dex::kDexNoIndex; |
| } else if ((*GetCurrentQuickFrame())->IsNative()) { |
| return cur_oat_quick_method_header_->ToDexPc( |
| GetCurrentQuickFrame(), cur_quick_frame_pc_, abort_on_failure); |
| } else if (cur_oat_quick_method_header_->IsOptimized()) { |
| StackMap* stack_map = GetCurrentStackMap(); |
| DCHECK(stack_map->IsValid()); |
| return stack_map->GetDexPc(); |
| } else { |
| DCHECK(cur_oat_quick_method_header_->IsNterpMethodHeader()); |
| return NterpGetDexPC(cur_quick_frame_); |
| } |
| } else { |
| return 0; |
| } |
| } |
| |
| extern "C" mirror::Object* artQuickGetProxyThisObject(ArtMethod** sp) |
| REQUIRES_SHARED(Locks::mutator_lock_); |
| |
| ObjPtr<mirror::Object> StackVisitor::GetThisObject() const { |
| DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), kRuntimePointerSize); |
| ArtMethod* m = GetMethod(); |
| if (m->IsStatic()) { |
| return nullptr; |
| } else if (m->IsNative()) { |
| if (cur_quick_frame_ != nullptr) { |
| HandleScope* hs; |
| if (cur_oat_quick_method_header_ != nullptr) { |
| hs = reinterpret_cast<HandleScope*>( |
| reinterpret_cast<char*>(cur_quick_frame_) + sizeof(ArtMethod*)); |
| } else { |
| // GenericJNI frames have the HandleScope under the managed frame. |
| uint32_t shorty_len; |
| const char* shorty = m->GetShorty(&shorty_len); |
| const size_t num_handle_scope_references = |
| /* this */ 1u + std::count(shorty + 1, shorty + shorty_len, 'L'); |
| hs = GetGenericJniHandleScope(cur_quick_frame_, num_handle_scope_references); |
| } |
| return hs->GetReference(0); |
| } else { |
| return cur_shadow_frame_->GetVRegReference(0); |
| } |
| } else if (m->IsProxyMethod()) { |
| if (cur_quick_frame_ != nullptr) { |
| return artQuickGetProxyThisObject(cur_quick_frame_); |
| } else { |
| return cur_shadow_frame_->GetVRegReference(0); |
| } |
| } else { |
| CodeItemDataAccessor accessor(m->DexInstructionData()); |
| if (!accessor.HasCodeItem()) { |
| UNIMPLEMENTED(ERROR) << "Failed to determine this object of abstract or proxy method: " |
| << ArtMethod::PrettyMethod(m); |
| return nullptr; |
| } else { |
| uint16_t reg = accessor.RegistersSize() - accessor.InsSize(); |
| uint32_t value = 0; |
| if (!GetVReg(m, reg, kReferenceVReg, &value)) { |
| return nullptr; |
| } |
| return reinterpret_cast<mirror::Object*>(value); |
| } |
| } |
| } |
| |
| size_t StackVisitor::GetNativePcOffset() const { |
| DCHECK(!IsShadowFrame()); |
| return GetCurrentOatQuickMethodHeader()->NativeQuickPcOffset(cur_quick_frame_pc_); |
| } |
| |
| bool StackVisitor::GetVRegFromDebuggerShadowFrame(uint16_t vreg, |
| VRegKind kind, |
| uint32_t* val) const { |
| size_t frame_id = const_cast<StackVisitor*>(this)->GetFrameId(); |
| ShadowFrame* shadow_frame = thread_->FindDebuggerShadowFrame(frame_id); |
| if (shadow_frame != nullptr) { |
| bool* updated_vreg_flags = thread_->GetUpdatedVRegFlags(frame_id); |
| DCHECK(updated_vreg_flags != nullptr); |
| if (updated_vreg_flags[vreg]) { |
| // Value is set by the debugger. |
| if (kind == kReferenceVReg) { |
| *val = static_cast<uint32_t>(reinterpret_cast<uintptr_t>( |
| shadow_frame->GetVRegReference(vreg))); |
| } else { |
| *val = shadow_frame->GetVReg(vreg); |
| } |
| return true; |
| } |
| } |
| // No value is set by the debugger. |
| return false; |
| } |
| |
| bool StackVisitor::GetVReg(ArtMethod* m, |
| uint16_t vreg, |
| VRegKind kind, |
| uint32_t* val, |
| std::optional<DexRegisterLocation> location) const { |
| if (cur_quick_frame_ != nullptr) { |
| DCHECK(context_ != nullptr); // You can't reliably read registers without a context. |
| DCHECK(m == GetMethod()); |
| // Check if there is value set by the debugger. |
| if (GetVRegFromDebuggerShadowFrame(vreg, kind, val)) { |
| return true; |
| } |
| bool result = false; |
| if (cur_oat_quick_method_header_->IsNterpMethodHeader()) { |
| result = true; |
| *val = (kind == kReferenceVReg) |
| ? NterpGetVRegReference(cur_quick_frame_, vreg) |
| : NterpGetVReg(cur_quick_frame_, vreg); |
| } else { |
| DCHECK(cur_oat_quick_method_header_->IsOptimized()); |
| if (location.has_value() && kind != kReferenceVReg) { |
| uint32_t val2 = *val; |
| // The caller already known the register location, so we can use the faster overload |
| // which does not decode the stack maps. |
| result = GetVRegFromOptimizedCode(location.value(), val); |
| // Compare to the slower overload. |
| DCHECK_EQ(result, GetVRegFromOptimizedCode(m, vreg, kind, &val2)); |
| DCHECK_EQ(*val, val2); |
| } else { |
| result = GetVRegFromOptimizedCode(m, vreg, kind, val); |
| } |
| } |
| if (kind == kReferenceVReg) { |
| // Perform a read barrier in case we are in a different thread and GC is ongoing. |
| mirror::Object* out = reinterpret_cast<mirror::Object*>(static_cast<uintptr_t>(*val)); |
| uintptr_t ptr_out = reinterpret_cast<uintptr_t>(GcRoot<mirror::Object>(out).Read()); |
| DCHECK_LT(ptr_out, std::numeric_limits<uint32_t>::max()); |
| *val = static_cast<uint32_t>(ptr_out); |
| } |
| return result; |
| } else { |
| DCHECK(cur_shadow_frame_ != nullptr); |
| if (kind == kReferenceVReg) { |
| *val = static_cast<uint32_t>(reinterpret_cast<uintptr_t>( |
| cur_shadow_frame_->GetVRegReference(vreg))); |
| } else { |
| *val = cur_shadow_frame_->GetVReg(vreg); |
| } |
| return true; |
| } |
| } |
| |
| bool StackVisitor::GetVRegFromOptimizedCode(ArtMethod* m, |
| uint16_t vreg, |
| VRegKind kind, |
| uint32_t* val) const { |
| DCHECK_EQ(m, GetMethod()); |
| // Can't be null or how would we compile its instructions? |
| DCHECK(m->GetCodeItem() != nullptr) << m->PrettyMethod(); |
| CodeItemDataAccessor accessor(m->DexInstructionData()); |
| uint16_t number_of_dex_registers = accessor.RegistersSize(); |
| DCHECK_LT(vreg, number_of_dex_registers); |
| const OatQuickMethodHeader* method_header = GetCurrentOatQuickMethodHeader(); |
| CodeInfo code_info(method_header); |
| |
| uint32_t native_pc_offset = method_header->NativeQuickPcOffset(cur_quick_frame_pc_); |
| StackMap stack_map = code_info.GetStackMapForNativePcOffset(native_pc_offset); |
| DCHECK(stack_map.IsValid()); |
| |
| DexRegisterMap dex_register_map = IsInInlinedFrame() |
| ? code_info.GetInlineDexRegisterMapOf(stack_map, current_inline_frames_.back()) |
| : code_info.GetDexRegisterMapOf(stack_map); |
| if (dex_register_map.empty()) { |
| return false; |
| } |
| DCHECK_EQ(dex_register_map.size(), number_of_dex_registers); |
| DexRegisterLocation::Kind location_kind = dex_register_map[vreg].GetKind(); |
| switch (location_kind) { |
| case DexRegisterLocation::Kind::kInStack: { |
| const int32_t offset = dex_register_map[vreg].GetStackOffsetInBytes(); |
| BitMemoryRegion stack_mask = code_info.GetStackMaskOf(stack_map); |
| if (kind == kReferenceVReg && !stack_mask.LoadBit(offset / kFrameSlotSize)) { |
| return false; |
| } |
| const uint8_t* addr = reinterpret_cast<const uint8_t*>(cur_quick_frame_) + offset; |
| *val = *reinterpret_cast<const uint32_t*>(addr); |
| return true; |
| } |
| case DexRegisterLocation::Kind::kInRegister: { |
| uint32_t register_mask = code_info.GetRegisterMaskOf(stack_map); |
| uint32_t reg = dex_register_map[vreg].GetMachineRegister(); |
| if (kind == kReferenceVReg && !(register_mask & (1 << reg))) { |
| return false; |
| } |
| return GetRegisterIfAccessible(reg, location_kind, val); |
| } |
| case DexRegisterLocation::Kind::kInRegisterHigh: |
| case DexRegisterLocation::Kind::kInFpuRegister: |
| case DexRegisterLocation::Kind::kInFpuRegisterHigh: { |
| if (kind == kReferenceVReg) { |
| return false; |
| } |
| uint32_t reg = dex_register_map[vreg].GetMachineRegister(); |
| return GetRegisterIfAccessible(reg, location_kind, val); |
| } |
| case DexRegisterLocation::Kind::kConstant: { |
| uint32_t result = dex_register_map[vreg].GetConstant(); |
| if (kind == kReferenceVReg && result != 0) { |
| return false; |
| } |
| *val = result; |
| return true; |
| } |
| case DexRegisterLocation::Kind::kNone: |
| return false; |
| default: |
| LOG(FATAL) << "Unexpected location kind " << dex_register_map[vreg].GetKind(); |
| UNREACHABLE(); |
| } |
| } |
| |
| bool StackVisitor::GetVRegFromOptimizedCode(DexRegisterLocation location, uint32_t* val) const { |
| switch (location.GetKind()) { |
| case DexRegisterLocation::Kind::kInvalid: |
| break; |
| case DexRegisterLocation::Kind::kInStack: { |
| const uint8_t* sp = reinterpret_cast<const uint8_t*>(cur_quick_frame_); |
| *val = *reinterpret_cast<const uint32_t*>(sp + location.GetStackOffsetInBytes()); |
| return true; |
| } |
| case DexRegisterLocation::Kind::kInRegister: |
| case DexRegisterLocation::Kind::kInRegisterHigh: |
| case DexRegisterLocation::Kind::kInFpuRegister: |
| case DexRegisterLocation::Kind::kInFpuRegisterHigh: |
| return GetRegisterIfAccessible(location.GetMachineRegister(), location.GetKind(), val); |
| case DexRegisterLocation::Kind::kConstant: |
| *val = location.GetConstant(); |
| return true; |
| case DexRegisterLocation::Kind::kNone: |
| return false; |
| } |
| LOG(FATAL) << "Unexpected location kind " << location.GetKind(); |
| UNREACHABLE(); |
| } |
| |
| bool StackVisitor::GetRegisterIfAccessible(uint32_t reg, |
| DexRegisterLocation::Kind location_kind, |
| uint32_t* val) const { |
| const bool is_float = (location_kind == DexRegisterLocation::Kind::kInFpuRegister) || |
| (location_kind == DexRegisterLocation::Kind::kInFpuRegisterHigh); |
| |
| if (kRuntimeISA == InstructionSet::kX86 && is_float) { |
| // X86 float registers are 64-bit and each XMM register is provided as two separate |
| // 32-bit registers by the context. |
| reg = (location_kind == DexRegisterLocation::Kind::kInFpuRegisterHigh) |
| ? (2 * reg + 1) |
| : (2 * reg); |
| } |
| |
| if (!IsAccessibleRegister(reg, is_float)) { |
| return false; |
| } |
| uintptr_t ptr_val = GetRegister(reg, is_float); |
| const bool target64 = Is64BitInstructionSet(kRuntimeISA); |
| if (target64) { |
| const bool is_high = (location_kind == DexRegisterLocation::Kind::kInRegisterHigh) || |
| (location_kind == DexRegisterLocation::Kind::kInFpuRegisterHigh); |
| int64_t value_long = static_cast<int64_t>(ptr_val); |
| ptr_val = static_cast<uintptr_t>(is_high ? High32Bits(value_long) : Low32Bits(value_long)); |
| } |
| *val = ptr_val; |
| return true; |
| } |
| |
| bool StackVisitor::GetVRegPairFromDebuggerShadowFrame(uint16_t vreg, |
| VRegKind kind_lo, |
| VRegKind kind_hi, |
| uint64_t* val) const { |
| uint32_t low_32bits; |
| uint32_t high_32bits; |
| bool success = GetVRegFromDebuggerShadowFrame(vreg, kind_lo, &low_32bits); |
| success &= GetVRegFromDebuggerShadowFrame(vreg + 1, kind_hi, &high_32bits); |
| if (success) { |
| *val = (static_cast<uint64_t>(high_32bits) << 32) | static_cast<uint64_t>(low_32bits); |
| } |
| return success; |
| } |
| |
| bool StackVisitor::GetVRegPair(ArtMethod* m, uint16_t vreg, VRegKind kind_lo, |
| VRegKind kind_hi, uint64_t* val) const { |
| if (kind_lo == kLongLoVReg) { |
| DCHECK_EQ(kind_hi, kLongHiVReg); |
| } else if (kind_lo == kDoubleLoVReg) { |
| DCHECK_EQ(kind_hi, kDoubleHiVReg); |
| } else { |
| LOG(FATAL) << "Expected long or double: kind_lo=" << kind_lo << ", kind_hi=" << kind_hi; |
| UNREACHABLE(); |
| } |
| // Check if there is value set by the debugger. |
| if (GetVRegPairFromDebuggerShadowFrame(vreg, kind_lo, kind_hi, val)) { |
| return true; |
| } |
| if (cur_quick_frame_ == nullptr) { |
| DCHECK(cur_shadow_frame_ != nullptr); |
| *val = cur_shadow_frame_->GetVRegLong(vreg); |
| return true; |
| } |
| if (cur_oat_quick_method_header_->IsNterpMethodHeader()) { |
| uint64_t val_lo = NterpGetVReg(cur_quick_frame_, vreg); |
| uint64_t val_hi = NterpGetVReg(cur_quick_frame_, vreg + 1); |
| *val = (val_hi << 32) + val_lo; |
| return true; |
| } |
| |
| DCHECK(context_ != nullptr); // You can't reliably read registers without a context. |
| DCHECK(m == GetMethod()); |
| DCHECK(cur_oat_quick_method_header_->IsOptimized()); |
| return GetVRegPairFromOptimizedCode(m, vreg, kind_lo, kind_hi, val); |
| } |
| |
| bool StackVisitor::GetVRegPairFromOptimizedCode(ArtMethod* m, uint16_t vreg, |
| VRegKind kind_lo, VRegKind kind_hi, |
| uint64_t* val) const { |
| uint32_t low_32bits; |
| uint32_t high_32bits; |
| bool success = GetVRegFromOptimizedCode(m, vreg, kind_lo, &low_32bits); |
| success &= GetVRegFromOptimizedCode(m, vreg + 1, kind_hi, &high_32bits); |
| if (success) { |
| *val = (static_cast<uint64_t>(high_32bits) << 32) | static_cast<uint64_t>(low_32bits); |
| } |
| return success; |
| } |
| |
| ShadowFrame* StackVisitor::PrepareSetVReg(ArtMethod* m, uint16_t vreg, bool wide) { |
| CodeItemDataAccessor accessor(m->DexInstructionData()); |
| if (!accessor.HasCodeItem()) { |
| return nullptr; |
| } |
| ShadowFrame* shadow_frame = GetCurrentShadowFrame(); |
| if (shadow_frame == nullptr) { |
| // This is a compiled frame: we must prepare and update a shadow frame that will |
| // be executed by the interpreter after deoptimization of the stack. |
| const size_t frame_id = GetFrameId(); |
| const uint16_t num_regs = accessor.RegistersSize(); |
| shadow_frame = thread_->FindOrCreateDebuggerShadowFrame(frame_id, num_regs, m, GetDexPc()); |
| CHECK(shadow_frame != nullptr); |
| // Remember the vreg(s) has been set for debugging and must not be overwritten by the |
| // original value during deoptimization of the stack. |
| thread_->GetUpdatedVRegFlags(frame_id)[vreg] = true; |
| if (wide) { |
| thread_->GetUpdatedVRegFlags(frame_id)[vreg + 1] = true; |
| } |
| } |
| return shadow_frame; |
| } |
| |
| bool StackVisitor::SetVReg(ArtMethod* m, uint16_t vreg, uint32_t new_value, VRegKind kind) { |
| DCHECK(kind == kIntVReg || kind == kFloatVReg); |
| ShadowFrame* shadow_frame = PrepareSetVReg(m, vreg, /* wide= */ false); |
| if (shadow_frame == nullptr) { |
| return false; |
| } |
| shadow_frame->SetVReg(vreg, new_value); |
| return true; |
| } |
| |
| bool StackVisitor::SetVRegReference(ArtMethod* m, uint16_t vreg, ObjPtr<mirror::Object> new_value) { |
| ShadowFrame* shadow_frame = PrepareSetVReg(m, vreg, /* wide= */ false); |
| if (shadow_frame == nullptr) { |
| return false; |
| } |
| shadow_frame->SetVRegReference(vreg, new_value); |
| return true; |
| } |
| |
| bool StackVisitor::SetVRegPair(ArtMethod* m, |
| uint16_t vreg, |
| uint64_t new_value, |
| VRegKind kind_lo, |
| VRegKind kind_hi) { |
| if (kind_lo == kLongLoVReg) { |
| DCHECK_EQ(kind_hi, kLongHiVReg); |
| } else if (kind_lo == kDoubleLoVReg) { |
| DCHECK_EQ(kind_hi, kDoubleHiVReg); |
| } else { |
| LOG(FATAL) << "Expected long or double: kind_lo=" << kind_lo << ", kind_hi=" << kind_hi; |
| UNREACHABLE(); |
| } |
| ShadowFrame* shadow_frame = PrepareSetVReg(m, vreg, /* wide= */ true); |
| if (shadow_frame == nullptr) { |
| return false; |
| } |
| shadow_frame->SetVRegLong(vreg, new_value); |
| return true; |
| } |
| |
| bool StackVisitor::IsAccessibleGPR(uint32_t reg) const { |
| DCHECK(context_ != nullptr); |
| return context_->IsAccessibleGPR(reg); |
| } |
| |
| uintptr_t* StackVisitor::GetGPRAddress(uint32_t reg) const { |
| DCHECK(cur_quick_frame_ != nullptr) << "This is a quick frame routine"; |
| DCHECK(context_ != nullptr); |
| return context_->GetGPRAddress(reg); |
| } |
| |
| uintptr_t StackVisitor::GetGPR(uint32_t reg) const { |
| DCHECK(cur_quick_frame_ != nullptr) << "This is a quick frame routine"; |
| DCHECK(context_ != nullptr); |
| return context_->GetGPR(reg); |
| } |
| |
| bool StackVisitor::IsAccessibleFPR(uint32_t reg) const { |
| DCHECK(context_ != nullptr); |
| return context_->IsAccessibleFPR(reg); |
| } |
| |
| uintptr_t StackVisitor::GetFPR(uint32_t reg) const { |
| DCHECK(cur_quick_frame_ != nullptr) << "This is a quick frame routine"; |
| DCHECK(context_ != nullptr); |
| return context_->GetFPR(reg); |
| } |
| |
| uintptr_t StackVisitor::GetReturnPcAddr() const { |
| uintptr_t sp = reinterpret_cast<uintptr_t>(GetCurrentQuickFrame()); |
| DCHECK_NE(sp, 0u); |
| return sp + GetCurrentQuickFrameInfo().GetReturnPcOffset(); |
| } |
| |
| uintptr_t StackVisitor::GetReturnPc() const { |
| return *reinterpret_cast<uintptr_t*>(GetReturnPcAddr()); |
| } |
| |
| void StackVisitor::SetReturnPc(uintptr_t new_ret_pc) { |
| *reinterpret_cast<uintptr_t*>(GetReturnPcAddr()) = new_ret_pc; |
| } |
| |
| size_t StackVisitor::ComputeNumFrames(Thread* thread, StackWalkKind walk_kind) { |
| struct NumFramesVisitor : public StackVisitor { |
| NumFramesVisitor(Thread* thread_in, StackWalkKind walk_kind_in) |
| : StackVisitor(thread_in, nullptr, walk_kind_in), frames(0) {} |
| |
| bool VisitFrame() override { |
| frames++; |
| return true; |
| } |
| |
| size_t frames; |
| }; |
| NumFramesVisitor visitor(thread, walk_kind); |
| visitor.WalkStack(true); |
| return visitor.frames; |
| } |
| |
| bool StackVisitor::GetNextMethodAndDexPc(ArtMethod** next_method, uint32_t* next_dex_pc) { |
| struct HasMoreFramesVisitor : public StackVisitor { |
| HasMoreFramesVisitor(Thread* thread, |
| StackWalkKind walk_kind, |
| size_t num_frames, |
| size_t frame_height) |
| : StackVisitor(thread, nullptr, walk_kind, num_frames), |
| frame_height_(frame_height), |
| found_frame_(false), |
| has_more_frames_(false), |
| next_method_(nullptr), |
| next_dex_pc_(0) { |
| } |
| |
| bool VisitFrame() override REQUIRES_SHARED(Locks::mutator_lock_) { |
| if (found_frame_) { |
| ArtMethod* method = GetMethod(); |
| if (method != nullptr && !method->IsRuntimeMethod()) { |
| has_more_frames_ = true; |
| next_method_ = method; |
| next_dex_pc_ = GetDexPc(); |
| return false; // End stack walk once next method is found. |
| } |
| } else if (GetFrameHeight() == frame_height_) { |
| found_frame_ = true; |
| } |
| return true; |
| } |
| |
| size_t frame_height_; |
| bool found_frame_; |
| bool has_more_frames_; |
| ArtMethod* next_method_; |
| uint32_t next_dex_pc_; |
| }; |
| HasMoreFramesVisitor visitor(thread_, walk_kind_, GetNumFrames(), GetFrameHeight()); |
| visitor.WalkStack(true); |
| *next_method = visitor.next_method_; |
| *next_dex_pc = visitor.next_dex_pc_; |
| return visitor.has_more_frames_; |
| } |
| |
| void StackVisitor::DescribeStack(Thread* thread) { |
| struct DescribeStackVisitor : public StackVisitor { |
| explicit DescribeStackVisitor(Thread* thread_in) |
| : StackVisitor(thread_in, nullptr, StackVisitor::StackWalkKind::kIncludeInlinedFrames) {} |
| |
| bool VisitFrame() override REQUIRES_SHARED(Locks::mutator_lock_) { |
| LOG(INFO) << "Frame Id=" << GetFrameId() << " " << DescribeLocation(); |
| return true; |
| } |
| }; |
| DescribeStackVisitor visitor(thread); |
| visitor.WalkStack(true); |
| } |
| |
| std::string StackVisitor::DescribeLocation() const { |
| std::string result("Visiting method '"); |
| ArtMethod* m = GetMethod(); |
| if (m == nullptr) { |
| return "upcall"; |
| } |
| result += m->PrettyMethod(); |
| result += StringPrintf("' at dex PC 0x%04x", GetDexPc()); |
| if (!IsShadowFrame()) { |
| result += StringPrintf(" (native PC %p)", reinterpret_cast<void*>(GetCurrentQuickFramePc())); |
| } |
| return result; |
| } |
| |
| void StackVisitor::SetMethod(ArtMethod* method) { |
| DCHECK(GetMethod() != nullptr); |
| if (cur_shadow_frame_ != nullptr) { |
| cur_shadow_frame_->SetMethod(method); |
| } else { |
| DCHECK(cur_quick_frame_ != nullptr); |
| CHECK(!IsInInlinedFrame()) << "We do not support setting inlined method's ArtMethod: " |
| << GetMethod()->PrettyMethod() << " is inlined into " |
| << GetOuterMethod()->PrettyMethod(); |
| *cur_quick_frame_ = method; |
| } |
| } |
| |
| static void AssertPcIsWithinQuickCode(ArtMethod* method, uintptr_t pc) |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| if (method->IsNative() || method->IsRuntimeMethod() || method->IsProxyMethod()) { |
| return; |
| } |
| |
| if (pc == reinterpret_cast<uintptr_t>(GetQuickInstrumentationExitPc())) { |
| return; |
| } |
| |
| Runtime* runtime = Runtime::Current(); |
| if (runtime->UseJitCompilation() && |
| runtime->GetJit()->GetCodeCache()->ContainsPc(reinterpret_cast<const void*>(pc))) { |
| return; |
| } |
| |
| const void* code = method->GetEntryPointFromQuickCompiledCode(); |
| if (code == GetQuickInstrumentationEntryPoint() || code == GetInvokeObsoleteMethodStub()) { |
| return; |
| } |
| |
| ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); |
| if (class_linker->IsQuickToInterpreterBridge(code) || |
| class_linker->IsQuickResolutionStub(code)) { |
| return; |
| } |
| |
| if (runtime->UseJitCompilation() && runtime->GetJit()->GetCodeCache()->ContainsPc(code)) { |
| return; |
| } |
| |
| uint32_t code_size = OatQuickMethodHeader::FromEntryPoint(code)->GetCodeSize(); |
| uintptr_t code_start = reinterpret_cast<uintptr_t>(code); |
| CHECK(code_start <= pc && pc <= (code_start + code_size)) |
| << method->PrettyMethod() |
| << " pc=" << std::hex << pc |
| << " code_start=" << code_start |
| << " code_size=" << code_size; |
| } |
| |
| void StackVisitor::ValidateFrame() const { |
| if (kIsDebugBuild) { |
| ArtMethod* method = GetMethod(); |
| ObjPtr<mirror::Class> declaring_class = method->GetDeclaringClass(); |
| // Runtime methods have null declaring class. |
| if (!method->IsRuntimeMethod()) { |
| CHECK(declaring_class != nullptr); |
| CHECK_EQ(declaring_class->GetClass(), declaring_class->GetClass()->GetClass()) |
| << declaring_class; |
| } else { |
| CHECK(declaring_class == nullptr); |
| } |
| Runtime* const runtime = Runtime::Current(); |
| LinearAlloc* const linear_alloc = runtime->GetLinearAlloc(); |
| if (!linear_alloc->Contains(method)) { |
| // Check class linker linear allocs. |
| // We get the canonical method as copied methods may have been allocated |
| // by a different class loader. |
| const PointerSize ptrSize = runtime->GetClassLinker()->GetImagePointerSize(); |
| ArtMethod* canonical = method->GetCanonicalMethod(ptrSize); |
| ObjPtr<mirror::Class> klass = canonical->GetDeclaringClass(); |
| LinearAlloc* const class_linear_alloc = (klass != nullptr) |
| ? runtime->GetClassLinker()->GetAllocatorForClassLoader(klass->GetClassLoader()) |
| : linear_alloc; |
| if (!class_linear_alloc->Contains(canonical)) { |
| // Check image space. |
| bool in_image = false; |
| for (auto& space : runtime->GetHeap()->GetContinuousSpaces()) { |
| if (space->IsImageSpace()) { |
| auto* image_space = space->AsImageSpace(); |
| const auto& header = image_space->GetImageHeader(); |
| const ImageSection& methods = header.GetMethodsSection(); |
| const ImageSection& runtime_methods = header.GetRuntimeMethodsSection(); |
| const size_t offset = reinterpret_cast<const uint8_t*>(canonical) - image_space->Begin(); |
| if (methods.Contains(offset) || runtime_methods.Contains(offset)) { |
| in_image = true; |
| break; |
| } |
| } |
| } |
| CHECK(in_image) << canonical->PrettyMethod() << " not in linear alloc or image"; |
| } |
| } |
| if (cur_quick_frame_ != nullptr) { |
| AssertPcIsWithinQuickCode(method, cur_quick_frame_pc_); |
| // Frame consistency checks. |
| size_t frame_size = GetCurrentQuickFrameInfo().FrameSizeInBytes(); |
| CHECK_NE(frame_size, 0u); |
| // For compiled code, we could try to have a rough guess at an upper size we expect |
| // to see for a frame: |
| // 256 registers |
| // 2 words HandleScope overhead |
| // 3+3 register spills |
| // const size_t kMaxExpectedFrameSize = (256 + 2 + 3 + 3) * sizeof(word); |
| const size_t kMaxExpectedFrameSize = interpreter::kNterpMaxFrame; |
| CHECK_LE(frame_size, kMaxExpectedFrameSize) << method->PrettyMethod(); |
| size_t return_pc_offset = GetCurrentQuickFrameInfo().GetReturnPcOffset(); |
| CHECK_LT(return_pc_offset, frame_size); |
| } |
| } |
| } |
| |
| QuickMethodFrameInfo StackVisitor::GetCurrentQuickFrameInfo() const { |
| if (cur_oat_quick_method_header_ != nullptr) { |
| if (cur_oat_quick_method_header_->IsOptimized()) { |
| return cur_oat_quick_method_header_->GetFrameInfo(); |
| } else { |
| DCHECK(cur_oat_quick_method_header_->IsNterpMethodHeader()); |
| return NterpFrameInfo(cur_quick_frame_); |
| } |
| } |
| |
| ArtMethod* method = GetMethod(); |
| Runtime* runtime = Runtime::Current(); |
| |
| if (method->IsAbstract()) { |
| return RuntimeCalleeSaveFrame::GetMethodFrameInfo(CalleeSaveType::kSaveRefsAndArgs); |
| } |
| |
| // This goes before IsProxyMethod since runtime methods have a null declaring class. |
| if (method->IsRuntimeMethod()) { |
| return runtime->GetRuntimeMethodFrameInfo(method); |
| } |
| |
| if (method->IsProxyMethod()) { |
| // There is only one direct method of a proxy class: the constructor. A direct method is |
| // cloned from the original java.lang.reflect.Proxy and is executed as usual quick |
| // compiled method without any stubs. Therefore the method must have a OatQuickMethodHeader. |
| DCHECK(!method->IsDirect() && !method->IsConstructor()) |
| << "Constructors of proxy classes must have a OatQuickMethodHeader"; |
| return RuntimeCalleeSaveFrame::GetMethodFrameInfo(CalleeSaveType::kSaveRefsAndArgs); |
| } |
| |
| // The only remaining cases are for native methods that either |
| // - use the Generic JNI stub, called either directly or through some |
| // (resolution, instrumentation) trampoline; or |
| // - fake a Generic JNI frame in art_jni_dlsym_lookup_critical_stub. |
| DCHECK(method->IsNative()); |
| if (kIsDebugBuild && !method->IsCriticalNative()) { |
| ClassLinker* class_linker = runtime->GetClassLinker(); |
| const void* entry_point = runtime->GetInstrumentation()->GetQuickCodeFor(method, |
| kRuntimePointerSize); |
| CHECK(class_linker->IsQuickGenericJniStub(entry_point) || |
| // The current entrypoint (after filtering out trampolines) may have changed |
| // from GenericJNI to JIT-compiled stub since we have entered this frame. |
| (runtime->GetJit() != nullptr && |
| runtime->GetJit()->GetCodeCache()->ContainsPc(entry_point))) << method->PrettyMethod(); |
| } |
| // Generic JNI frame is just like the SaveRefsAndArgs frame. |
| // Note that HandleScope, if any, is below the frame. |
| return RuntimeCalleeSaveFrame::GetMethodFrameInfo(CalleeSaveType::kSaveRefsAndArgs); |
| } |
| |
| template <StackVisitor::CountTransitions kCount> |
| void StackVisitor::WalkStack(bool include_transitions) { |
| if (check_suspended_) { |
| DCHECK(thread_ == Thread::Current() || thread_->IsSuspended()); |
| } |
| CHECK_EQ(cur_depth_, 0U); |
| size_t inlined_frames_count = 0; |
| |
| for (const ManagedStack* current_fragment = thread_->GetManagedStack(); |
| current_fragment != nullptr; current_fragment = current_fragment->GetLink()) { |
| cur_shadow_frame_ = current_fragment->GetTopShadowFrame(); |
| cur_quick_frame_ = current_fragment->GetTopQuickFrame(); |
| cur_quick_frame_pc_ = 0; |
| DCHECK(cur_oat_quick_method_header_ == nullptr); |
| if (cur_quick_frame_ != nullptr) { // Handle quick stack frames. |
| // Can't be both a shadow and a quick fragment. |
| DCHECK(current_fragment->GetTopShadowFrame() == nullptr); |
| ArtMethod* method = *cur_quick_frame_; |
| DCHECK(method != nullptr); |
| bool header_retrieved = false; |
| if (method->IsNative()) { |
| // We do not have a PC for the first frame, so we cannot simply use |
| // ArtMethod::GetOatQuickMethodHeader() as we're unable to distinguish there |
| // between GenericJNI frame and JIT-compiled JNI stub; the entrypoint may have |
| // changed since the frame was entered. The top quick frame tag indicates |
| // GenericJNI here, otherwise it's either AOT-compiled or JNI-compiled JNI stub. |
| if (UNLIKELY(current_fragment->GetTopQuickFrameTag())) { |
| // The generic JNI does not have any method header. |
| cur_oat_quick_method_header_ = nullptr; |
| } else { |
| const void* existing_entry_point = method->GetEntryPointFromQuickCompiledCode(); |
| CHECK(existing_entry_point != nullptr); |
| Runtime* runtime = Runtime::Current(); |
| ClassLinker* class_linker = runtime->GetClassLinker(); |
| // Check whether we can quickly get the header from the current entrypoint. |
| if (!class_linker->IsQuickGenericJniStub(existing_entry_point) && |
| !class_linker->IsQuickResolutionStub(existing_entry_point) && |
| existing_entry_point != GetQuickInstrumentationEntryPoint()) { |
| cur_oat_quick_method_header_ = |
| OatQuickMethodHeader::FromEntryPoint(existing_entry_point); |
| } else { |
| const void* code = method->GetOatMethodQuickCode(class_linker->GetImagePointerSize()); |
| if (code != nullptr) { |
| cur_oat_quick_method_header_ = OatQuickMethodHeader::FromEntryPoint(code); |
| } else { |
| // This must be a JITted JNI stub frame. |
| CHECK(runtime->GetJit() != nullptr); |
| code = runtime->GetJit()->GetCodeCache()->GetJniStubCode(method); |
| CHECK(code != nullptr) << method->PrettyMethod(); |
| cur_oat_quick_method_header_ = OatQuickMethodHeader::FromCodePointer(code); |
| } |
| } |
| } |
| header_retrieved = true; |
| } |
| while (method != nullptr) { |
| if (!header_retrieved) { |
| cur_oat_quick_method_header_ = method->GetOatQuickMethodHeader(cur_quick_frame_pc_); |
| } |
| header_retrieved = false; // Force header retrieval in next iteration. |
| ValidateFrame(); |
| |
| if ((walk_kind_ == StackWalkKind::kIncludeInlinedFrames) |
| && (cur_oat_quick_method_header_ != nullptr) |
| && cur_oat_quick_method_header_->IsOptimized() |
| && !method->IsNative() // JNI methods cannot have any inlined frames. |
| && CodeInfo::HasInlineInfo(cur_oat_quick_method_header_->GetOptimizedCodeInfoPtr())) { |
| DCHECK_NE(cur_quick_frame_pc_, 0u); |
| CodeInfo* code_info = GetCurrentInlineInfo(); |
| StackMap* stack_map = GetCurrentStackMap(); |
| if (stack_map->IsValid() && stack_map->HasInlineInfo()) { |
| DCHECK_EQ(current_inline_frames_.size(), 0u); |
| for (current_inline_frames_ = code_info->GetInlineInfosOf(*stack_map); |
| !current_inline_frames_.empty(); |
| current_inline_frames_.pop_back()) { |
| bool should_continue = VisitFrame(); |
| if (UNLIKELY(!should_continue)) { |
| return; |
| } |
| cur_depth_++; |
| inlined_frames_count++; |
| } |
| } |
| } |
| |
| bool should_continue = VisitFrame(); |
| if (UNLIKELY(!should_continue)) { |
| return; |
| } |
| |
| QuickMethodFrameInfo frame_info = GetCurrentQuickFrameInfo(); |
| if (context_ != nullptr) { |
| context_->FillCalleeSaves(reinterpret_cast<uint8_t*>(cur_quick_frame_), frame_info); |
| } |
| // Compute PC for next stack frame from return PC. |
| size_t frame_size = frame_info.FrameSizeInBytes(); |
| uintptr_t return_pc_addr = GetReturnPcAddr(); |
| uintptr_t return_pc = *reinterpret_cast<uintptr_t*>(return_pc_addr); |
| |
| if (UNLIKELY(reinterpret_cast<uintptr_t>(GetQuickInstrumentationExitPc()) == return_pc)) { |
| // While profiling, the return pc is restored from the side stack, except when walking |
| // the stack for an exception where the side stack will be unwound in VisitFrame. |
| const std::map<uintptr_t, instrumentation::InstrumentationStackFrame>& |
| instrumentation_stack = *thread_->GetInstrumentationStack(); |
| auto it = instrumentation_stack.find(return_pc_addr); |
| CHECK(it != instrumentation_stack.end()); |
| const instrumentation::InstrumentationStackFrame& instrumentation_frame = it->second; |
| if (GetMethod() == |
| Runtime::Current()->GetCalleeSaveMethod(CalleeSaveType::kSaveAllCalleeSaves)) { |
| // Skip runtime save all callee frames which are used to deliver exceptions. |
| } else if (instrumentation_frame.interpreter_entry_) { |
| ArtMethod* callee = |
| Runtime::Current()->GetCalleeSaveMethod(CalleeSaveType::kSaveRefsAndArgs); |
| CHECK_EQ(GetMethod(), callee) << "Expected: " << ArtMethod::PrettyMethod(callee) |
| << " Found: " << ArtMethod::PrettyMethod(GetMethod()); |
| } else if (!instrumentation_frame.method_->IsRuntimeMethod()) { |
| // Trampolines get replaced with their actual method in the stack, |
| // so don't do the check below for runtime methods. |
| // Instrumentation generally doesn't distinguish between a method's obsolete and |
| // non-obsolete version. |
| CHECK_EQ(instrumentation_frame.method_->GetNonObsoleteMethod(), |
| GetMethod()->GetNonObsoleteMethod()) |
| << "Expected: " |
| << ArtMethod::PrettyMethod(instrumentation_frame.method_->GetNonObsoleteMethod()) |
| << " Found: " << ArtMethod::PrettyMethod(GetMethod()->GetNonObsoleteMethod()); |
| } |
| return_pc = instrumentation_frame.return_pc_; |
| } |
| |
| cur_quick_frame_pc_ = return_pc; |
| uint8_t* next_frame = reinterpret_cast<uint8_t*>(cur_quick_frame_) + frame_size; |
| cur_quick_frame_ = reinterpret_cast<ArtMethod**>(next_frame); |
| |
| if (kDebugStackWalk) { |
| LOG(INFO) << ArtMethod::PrettyMethod(method) << "@" << method << " size=" << frame_size |
| << std::boolalpha |
| << " optimized=" << (cur_oat_quick_method_header_ != nullptr && |
| cur_oat_quick_method_header_->IsOptimized()) |
| << " native=" << method->IsNative() |
| << std::noboolalpha |
| << " entrypoints=" << method->GetEntryPointFromQuickCompiledCode() |
| << "," << (method->IsNative() ? method->GetEntryPointFromJni() : nullptr) |
| << " next=" << *cur_quick_frame_; |
| } |
| |
| if (kCount == CountTransitions::kYes || !method->IsRuntimeMethod()) { |
| cur_depth_++; |
| } |
| method = *cur_quick_frame_; |
| } |
| // We reached a transition frame, it doesn't have a method header. |
| cur_oat_quick_method_header_ = nullptr; |
| } else if (cur_shadow_frame_ != nullptr) { |
| do { |
| ValidateFrame(); |
| bool should_continue = VisitFrame(); |
| if (UNLIKELY(!should_continue)) { |
| return; |
| } |
| cur_depth_++; |
| cur_shadow_frame_ = cur_shadow_frame_->GetLink(); |
| } while (cur_shadow_frame_ != nullptr); |
| } |
| if (include_transitions) { |
| bool should_continue = VisitFrame(); |
| if (!should_continue) { |
| return; |
| } |
| } |
| if (kCount == CountTransitions::kYes) { |
| cur_depth_++; |
| } |
| } |
| if (num_frames_ != 0) { |
| CHECK_EQ(cur_depth_, num_frames_); |
| } |
| } |
| |
| template void StackVisitor::WalkStack<StackVisitor::CountTransitions::kYes>(bool); |
| template void StackVisitor::WalkStack<StackVisitor::CountTransitions::kNo>(bool); |
| |
| } // namespace art |