mirror of
https://github.com/dart-lang/sdk
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f9a6a5bdd2
TEST=build Change-Id: I2834ef7cf7cb7c8770f8167a2438cbedcee5c623 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/292063 Commit-Queue: Ryan Macnak <rmacnak@google.com> Reviewed-by: Alexander Aprelev <aam@google.com>
757 lines
27 KiB
C++
757 lines
27 KiB
C++
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include "vm/stack_frame.h"
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#include "platform/memory_sanitizer.h"
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#include "vm/code_descriptors.h"
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#include "vm/compiler/runtime_api.h"
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#include "vm/heap/become.h"
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#include "vm/isolate.h"
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#include "vm/object.h"
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#include "vm/object_store.h"
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#include "vm/os.h"
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#include "vm/parser.h"
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#include "vm/raw_object.h"
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#include "vm/reusable_handles.h"
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#include "vm/reverse_pc_lookup_cache.h"
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#include "vm/scopes.h"
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#include "vm/stub_code.h"
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#include "vm/visitor.h"
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#if !defined(DART_PRECOMPILED_RUNTIME)
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#include "vm/deopt_instructions.h"
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#endif // !defined(DART_PRECOMPILED_RUNTIME)
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namespace dart {
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const FrameLayout invalid_frame_layout = {
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/*.first_object_from_fp = */ -1,
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/*.last_fixed_object_from_fp = */ -1,
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/*.param_end_from_fp = */ -1,
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/*.last_param_from_entry_sp = */ -1,
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/*.first_local_from_fp = */ -1,
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/*.dart_fixed_frame_size = */ -1,
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/*.saved_caller_pp_from_fp = */ -1,
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/*.saved_caller_fp_from_fp = */ -1,
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/*.saved_caller_pc_from_fp = */ -1,
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/*.code_from_fp = */ -1,
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/*.exit_link_slot_from_entry_fp = */ -1,
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};
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const FrameLayout default_frame_layout = {
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/*.first_object_from_fp = */ kFirstObjectSlotFromFp,
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/*.last_fixed_object_from_fp = */ kLastFixedObjectSlotFromFp,
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/*.param_end_from_fp = */ kParamEndSlotFromFp,
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/*.last_param_from_entry_sp = */ kLastParamSlotFromEntrySp,
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/*.first_local_from_fp = */ kFirstLocalSlotFromFp,
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/*.dart_fixed_frame_size = */ kDartFrameFixedSize,
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/*.saved_caller_pp_from_fp = */ kSavedCallerPpSlotFromFp,
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/*.saved_caller_fp_from_fp = */ kSavedCallerFpSlotFromFp,
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/*.saved_caller_pc_from_fp = */ kSavedCallerPcSlotFromFp,
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/*.code_from_fp = */ kPcMarkerSlotFromFp,
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/*.exit_link_slot_from_entry_fp = */ kExitLinkSlotFromEntryFp,
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};
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const FrameLayout bare_instructions_frame_layout = {
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/*.first_object_from_pc =*/kFirstObjectSlotFromFp, // No saved PP slot.
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/*.last_fixed_object_from_fp = */ kLastFixedObjectSlotFromFp +
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2, // No saved CODE, PP slots
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/*.param_end_from_fp = */ kParamEndSlotFromFp,
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/*.last_param_from_entry_sp = */ kLastParamSlotFromEntrySp,
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/*.first_local_from_fp =*/kFirstLocalSlotFromFp +
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2, // No saved CODE, PP slots.
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/*.dart_fixed_frame_size =*/kDartFrameFixedSize -
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2, // No saved CODE, PP slots.
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/*.saved_caller_pp_from_fp = */ 0, // No saved PP slot.
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/*.saved_caller_fp_from_fp = */ kSavedCallerFpSlotFromFp,
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/*.saved_caller_pc_from_fp = */ kSavedCallerPcSlotFromFp,
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/*.code_from_fp = */ 0, // No saved CODE
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/*.exit_link_slot_from_entry_fp = */ kExitLinkSlotFromEntryFp,
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};
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namespace compiler {
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namespace target {
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FrameLayout frame_layout = invalid_frame_layout;
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}
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} // namespace compiler
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FrameLayout runtime_frame_layout = invalid_frame_layout;
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int FrameLayout::FrameSlotForVariable(const LocalVariable* variable) const {
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ASSERT(!variable->is_captured());
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return this->FrameSlotForVariableIndex(variable->index().value());
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}
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int FrameLayout::FrameSlotForVariableIndex(int variable_index) const {
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// Variable indices are:
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// [1, 2, ..., M] for the M parameters.
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// [0, -1, -2, ... -(N-1)] for the N [LocalVariable]s
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// See (runtime/vm/scopes.h)
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return variable_index <= 0 ? (variable_index + first_local_from_fp)
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: (variable_index + param_end_from_fp);
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}
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void FrameLayout::Init() {
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// By default we use frames with CODE_REG/PP in the frame.
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compiler::target::frame_layout = default_frame_layout;
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runtime_frame_layout = default_frame_layout;
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if (FLAG_precompiled_mode) {
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compiler::target::frame_layout = bare_instructions_frame_layout;
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}
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#if defined(DART_PRECOMPILED_RUNTIME)
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if (FLAG_precompiled_mode) {
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compiler::target::frame_layout = invalid_frame_layout;
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runtime_frame_layout = bare_instructions_frame_layout;
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}
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#endif
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}
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bool StackFrame::IsBareInstructionsDartFrame() const {
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if (!FLAG_precompiled_mode) {
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return false;
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}
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NoSafepointScope no_safepoint;
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Code code;
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code = ReversePc::Lookup(this->isolate_group(), pc(),
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/*is_return_address=*/true);
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if (!code.IsNull()) {
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auto const cid = code.OwnerClassId();
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ASSERT(cid == kNullCid || cid == kClassCid || cid == kFunctionCid);
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return cid == kFunctionCid;
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}
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return false;
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}
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bool StackFrame::IsBareInstructionsStubFrame() const {
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if (!FLAG_precompiled_mode) {
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return false;
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}
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NoSafepointScope no_safepoint;
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Code code;
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code = ReversePc::Lookup(this->isolate_group(), pc(),
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/*is_return_address=*/true);
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if (!code.IsNull()) {
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auto const cid = code.OwnerClassId();
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ASSERT(cid == kNullCid || cid == kClassCid || cid == kFunctionCid);
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return cid == kNullCid || cid == kClassCid;
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}
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return false;
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}
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bool StackFrame::IsStubFrame() const {
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if (FLAG_precompiled_mode) {
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return IsBareInstructionsStubFrame();
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}
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ASSERT(!(IsEntryFrame() || IsExitFrame()));
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#if !defined(DART_HOST_OS_WINDOWS) && !defined(DART_HOST_OS_FUCHSIA)
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// On Windows and Fuchsia, the profiler calls this from a separate thread
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// where Thread::Current() is nullptr, so we cannot create a NoSafepointScope.
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NoSafepointScope no_safepoint;
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#endif
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CodePtr code = GetCodeObject();
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ASSERT(code != Object::null());
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auto const cid = Code::OwnerClassIdOf(code);
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ASSERT(cid == kNullCid || cid == kClassCid || cid == kFunctionCid);
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return cid == kNullCid || cid == kClassCid;
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}
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const char* StackFrame::ToCString() const {
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ASSERT(thread_ == Thread::Current());
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Zone* zone = Thread::Current()->zone();
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const Code& code = Code::Handle(zone, GetCodeObject());
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const char* name =
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code.IsNull()
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? "Cannot find code object"
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: code.QualifiedName(NameFormattingParams(Object::kInternalName));
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return zone->PrintToString(" pc 0x%" Pp " fp 0x%" Pp " sp 0x%" Pp " %s",
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pc(), fp(), sp(), name);
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}
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void ExitFrame::VisitObjectPointers(ObjectPointerVisitor* visitor) {
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ASSERT(visitor != nullptr);
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// Visit pc marker and saved pool pointer.
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ObjectPtr* last_fixed = reinterpret_cast<ObjectPtr*>(fp()) +
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runtime_frame_layout.first_object_from_fp;
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ObjectPtr* first_fixed = reinterpret_cast<ObjectPtr*>(fp()) +
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runtime_frame_layout.last_fixed_object_from_fp;
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if (first_fixed <= last_fixed) {
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visitor->VisitPointers(first_fixed, last_fixed);
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} else {
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ASSERT(runtime_frame_layout.first_object_from_fp ==
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runtime_frame_layout.first_local_from_fp);
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}
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}
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void EntryFrame::VisitObjectPointers(ObjectPointerVisitor* visitor) {
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ASSERT(visitor != nullptr);
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// Visit objects between SP and (FP - callee_save_area).
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ObjectPtr* first = reinterpret_cast<ObjectPtr*>(sp());
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ObjectPtr* last =
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reinterpret_cast<ObjectPtr*>(fp()) + kExitLinkSlotFromEntryFp - 1;
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// There may not be any pointer to visit; in this case, first > last.
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visitor->VisitPointers(first, last);
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}
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void StackFrame::VisitObjectPointers(ObjectPointerVisitor* visitor) {
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ASSERT(visitor != nullptr);
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// NOTE: This code runs while GC is in progress and runs within
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// a NoHandleScope block. Hence it is not ok to use regular Zone or
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// Scope handles. We use direct stack handles, the raw pointers in
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// these handles are not traversed. The use of handles is mainly to
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// be able to reuse the handle based code and avoid having to add
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// helper functions to the raw object interface.
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NoSafepointScope no_safepoint;
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Code code;
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CompressedStackMaps::RawPayloadHandle maps;
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CompressedStackMaps::RawPayloadHandle global_table;
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uword code_start;
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if (FLAG_precompiled_mode) {
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const UntaggedCompressedStackMaps::Payload* global_table_payload;
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maps = ReversePc::FindStackMap(isolate_group(), pc(),
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/*is_return_address=*/true, &code_start,
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&global_table_payload);
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global_table = global_table_payload;
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} else {
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ObjectPtr pc_marker = *(reinterpret_cast<ObjectPtr*>(
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fp() + (runtime_frame_layout.code_from_fp * kWordSize)));
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// May forward raw code. Note we don't just visit the pc marker slot first
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// because the visitor's forwarding might not be idempotent.
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visitor->VisitPointer(&pc_marker);
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if (pc_marker->IsHeapObject() && (pc_marker->GetClassId() == kCodeCid)) {
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code ^= pc_marker;
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code_start = code.PayloadStart();
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ASSERT(code.compressed_stackmaps() != CompressedStackMaps::null());
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maps = code.compressed_stackmaps();
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if (maps.UsesGlobalTable()) {
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global_table =
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isolate_group()->object_store()->canonicalized_stack_map_entries();
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}
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} else {
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ASSERT(pc_marker == Object::null());
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}
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}
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if (!maps.IsNull()) {
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// Optimized frames have a stack map. We need to visit the frame based
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// on the stack map.
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CompressedStackMaps::Iterator<CompressedStackMaps::RawPayloadHandle> it(
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maps, global_table);
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const uint32_t pc_offset = pc() - code_start;
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if (it.Find(pc_offset)) {
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ObjectPtr* first = reinterpret_cast<ObjectPtr*>(sp());
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ObjectPtr* last = reinterpret_cast<ObjectPtr*>(
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fp() + (runtime_frame_layout.first_local_from_fp * kWordSize));
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// A stack map is present in the code object, use the stack map to
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// visit frame slots which are marked as having objects.
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//
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// The layout of the frame is (lower addresses to the right):
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// | spill slots | outgoing arguments | saved registers | slow-path args |
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// |XXXXXXXXXXXXX|--------------------|XXXXXXXXXXXXXXXXX|XXXXXXXXXXXXXXXX|
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//
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// The spill slots and any saved registers are described in the stack
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// map. The outgoing arguments are assumed to be tagged; the number
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// of outgoing arguments is not explicitly tracked.
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// Spill slots are at the 'bottom' of the frame.
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intptr_t spill_slot_count = it.SpillSlotBitCount();
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for (intptr_t bit = 0; bit < spill_slot_count; ++bit) {
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if (it.IsObject(bit)) {
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visitor->VisitPointer(last);
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}
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--last;
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}
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// The live registers at the 'top' of the frame comprise the rest of the
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// stack map.
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for (intptr_t bit = it.Length() - 1; bit >= spill_slot_count; --bit) {
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if (it.IsObject(bit)) {
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visitor->VisitPointer(first);
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}
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++first;
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}
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// The last slot can be one slot (but not more) past the last slot
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// in the case that all slots were covered by the stack map.
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ASSERT((last + 1) >= first);
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visitor->VisitPointers(first, last);
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// Now visit other slots which might be part of the calling convention.
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first = reinterpret_cast<ObjectPtr*>(
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fp() + ((runtime_frame_layout.first_local_from_fp + 1) * kWordSize));
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last = reinterpret_cast<ObjectPtr*>(
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fp() + (runtime_frame_layout.first_object_from_fp * kWordSize));
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visitor->VisitPointers(first, last);
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return;
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}
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// If we are missing a stack map for a given PC offset, this must either be
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// unoptimized code, code with no stack map information at all, or the entry
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// to an osr function. In each of these cases, all stack slots contain
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// tagged pointers, so fall through.
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#if defined(DEBUG)
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if (FLAG_precompiled_mode) {
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ASSERT(IsStubFrame());
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} else {
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ASSERT(!code.is_optimized() ||
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(pc_offset == code.EntryPoint() - code.PayloadStart()));
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}
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#endif // defined(DEBUG)
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}
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// For normal unoptimized Dart frames and Stub frames each slot
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// between the first and last included are tagged objects.
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ObjectPtr* first = reinterpret_cast<ObjectPtr*>(sp());
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ObjectPtr* last = reinterpret_cast<ObjectPtr*>(
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fp() + (runtime_frame_layout.first_object_from_fp * kWordSize));
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visitor->VisitPointers(first, last);
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}
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FunctionPtr StackFrame::LookupDartFunction() const {
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const Code& code = Code::Handle(LookupDartCode());
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if (!code.IsNull()) {
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const Object& owner = Object::Handle(code.owner());
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if (owner.IsFunction()) {
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return Function::Cast(owner).ptr();
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}
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}
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return Function::null();
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}
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CodePtr StackFrame::LookupDartCode() const {
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// We add a no gc scope to ensure that the code below does not trigger
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// a GC as we are handling raw object references here. It is possible
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// that the code is called while a GC is in progress, that is ok.
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#if !defined(DART_HOST_OS_WINDOWS) && !defined(DART_HOST_OS_FUCHSIA)
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// On Windows and Fuchsia, the profiler calls this from a separate thread
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// where Thread::Current() is nullptr, so we cannot create a NoSafepointScope.
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NoSafepointScope no_safepoint;
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#endif
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CodePtr code = GetCodeObject();
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if ((code != Code::null()) && Code::OwnerClassIdOf(code) == kFunctionCid) {
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return code;
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}
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return Code::null();
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}
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CodePtr StackFrame::GetCodeObject() const {
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#if defined(DART_PRECOMPILED_RUNTIME)
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if (FLAG_precompiled_mode) {
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NoSafepointScope no_safepoint;
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CodePtr code = ReversePc::Lookup(isolate_group(), pc(),
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/*is_return_address=*/true);
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ASSERT(code != Code::null());
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return code;
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}
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#endif // defined(DART_PRECOMPILED_RUNTIME)
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ObjectPtr pc_marker = *(reinterpret_cast<ObjectPtr*>(
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fp() + runtime_frame_layout.code_from_fp * kWordSize));
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ASSERT((pc_marker == Object::null()) ||
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(pc_marker->GetClassId() == kCodeCid));
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return static_cast<CodePtr>(pc_marker);
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}
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bool StackFrame::FindExceptionHandler(Thread* thread,
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uword* handler_pc,
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bool* needs_stacktrace,
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bool* has_catch_all,
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bool* is_optimized) const {
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REUSABLE_CODE_HANDLESCOPE(thread);
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Code& code = reused_code_handle.Handle();
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REUSABLE_EXCEPTION_HANDLERS_HANDLESCOPE(thread);
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ExceptionHandlers& handlers = reused_exception_handlers_handle.Handle();
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REUSABLE_PC_DESCRIPTORS_HANDLESCOPE(thread);
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PcDescriptors& descriptors = reused_pc_descriptors_handle.Handle();
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uword start;
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code = LookupDartCode();
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if (code.IsNull()) {
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return false; // Stub frames do not have exception handlers.
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}
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start = code.PayloadStart();
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handlers = code.exception_handlers();
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descriptors = code.pc_descriptors();
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*is_optimized = code.is_optimized();
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HandlerInfoCache* cache = thread->isolate()->handler_info_cache();
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ExceptionHandlerInfo* info = cache->Lookup(pc());
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if (info != nullptr) {
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*handler_pc = start + info->handler_pc_offset;
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*needs_stacktrace = (info->needs_stacktrace != 0);
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*has_catch_all = (info->has_catch_all != 0);
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return true;
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}
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intptr_t try_index = -1;
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if (handlers.num_entries() != 0) {
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uword pc_offset = pc() - code.PayloadStart();
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PcDescriptors::Iterator iter(descriptors, UntaggedPcDescriptors::kAnyKind);
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while (iter.MoveNext()) {
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const intptr_t current_try_index = iter.TryIndex();
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if ((iter.PcOffset() == pc_offset) && (current_try_index != -1)) {
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try_index = current_try_index;
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break;
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}
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}
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}
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if (try_index == -1) {
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if (handlers.has_async_handler()) {
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*handler_pc = StubCode::AsyncExceptionHandler().EntryPoint();
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*needs_stacktrace = true;
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*has_catch_all = true;
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return true;
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}
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return false;
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}
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ExceptionHandlerInfo handler_info;
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handlers.GetHandlerInfo(try_index, &handler_info);
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*handler_pc = start + handler_info.handler_pc_offset;
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*needs_stacktrace = (handler_info.needs_stacktrace != 0);
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*has_catch_all = (handler_info.has_catch_all != 0);
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cache->Insert(pc(), handler_info);
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return true;
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}
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TokenPosition StackFrame::GetTokenPos() const {
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const Code& code = Code::Handle(LookupDartCode());
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if (code.IsNull()) {
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return TokenPosition::kNoSource; // Stub frames do not have token_pos.
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}
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uword pc_offset = pc() - code.PayloadStart();
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const PcDescriptors& descriptors =
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PcDescriptors::Handle(code.pc_descriptors());
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ASSERT(!descriptors.IsNull());
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PcDescriptors::Iterator iter(descriptors, UntaggedPcDescriptors::kAnyKind);
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while (iter.MoveNext()) {
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if (iter.PcOffset() == pc_offset) {
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return TokenPosition(iter.TokenPos());
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}
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}
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return TokenPosition::kNoSource;
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}
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bool StackFrame::IsValid() const {
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if (IsEntryFrame() || IsExitFrame() || IsStubFrame()) {
|
|
return true;
|
|
}
|
|
return (LookupDartCode() != Code::null());
|
|
}
|
|
|
|
void StackFrame::DumpCurrentTrace() {
|
|
StackFrameIterator frames(ValidationPolicy::kDontValidateFrames,
|
|
Thread::Current(),
|
|
StackFrameIterator::kNoCrossThreadIteration);
|
|
StackFrame* frame = frames.NextFrame();
|
|
while (frame != nullptr) {
|
|
OS::PrintErr("%s\n", frame->ToCString());
|
|
frame = frames.NextFrame();
|
|
}
|
|
}
|
|
|
|
void StackFrameIterator::SetupLastExitFrameData() {
|
|
ASSERT(thread_ != nullptr);
|
|
uword exit_marker = thread_->top_exit_frame_info();
|
|
frames_.fp_ = exit_marker;
|
|
frames_.sp_ = 0;
|
|
frames_.pc_ = 0;
|
|
frames_.Unpoison();
|
|
}
|
|
|
|
void StackFrameIterator::SetupNextExitFrameData() {
|
|
ASSERT(entry_.fp() != 0);
|
|
uword exit_address = entry_.fp() + (kExitLinkSlotFromEntryFp * kWordSize);
|
|
uword exit_marker = *reinterpret_cast<uword*>(exit_address);
|
|
frames_.fp_ = exit_marker;
|
|
frames_.sp_ = 0;
|
|
frames_.pc_ = 0;
|
|
frames_.Unpoison();
|
|
}
|
|
|
|
StackFrameIterator::StackFrameIterator(ValidationPolicy validation_policy,
|
|
Thread* thread,
|
|
CrossThreadPolicy cross_thread_policy)
|
|
: validate_(validation_policy == ValidationPolicy::kValidateFrames),
|
|
entry_(thread),
|
|
exit_(thread),
|
|
frames_(thread),
|
|
current_frame_(nullptr),
|
|
thread_(thread) {
|
|
ASSERT(cross_thread_policy == kAllowCrossThreadIteration ||
|
|
thread_ == Thread::Current());
|
|
SetupLastExitFrameData(); // Setup data for last exit frame.
|
|
}
|
|
|
|
StackFrameIterator::StackFrameIterator(uword last_fp,
|
|
ValidationPolicy validation_policy,
|
|
Thread* thread,
|
|
CrossThreadPolicy cross_thread_policy)
|
|
: validate_(validation_policy == ValidationPolicy::kValidateFrames),
|
|
entry_(thread),
|
|
exit_(thread),
|
|
frames_(thread),
|
|
current_frame_(nullptr),
|
|
thread_(thread) {
|
|
ASSERT(cross_thread_policy == kAllowCrossThreadIteration ||
|
|
thread_ == Thread::Current());
|
|
frames_.fp_ = last_fp;
|
|
frames_.sp_ = 0;
|
|
frames_.pc_ = 0;
|
|
frames_.Unpoison();
|
|
}
|
|
|
|
StackFrameIterator::StackFrameIterator(uword fp,
|
|
uword sp,
|
|
uword pc,
|
|
ValidationPolicy validation_policy,
|
|
Thread* thread,
|
|
CrossThreadPolicy cross_thread_policy)
|
|
: validate_(validation_policy == ValidationPolicy::kValidateFrames),
|
|
entry_(thread),
|
|
exit_(thread),
|
|
frames_(thread),
|
|
current_frame_(nullptr),
|
|
thread_(thread) {
|
|
ASSERT(cross_thread_policy == kAllowCrossThreadIteration ||
|
|
thread_ == Thread::Current());
|
|
frames_.fp_ = fp;
|
|
frames_.sp_ = sp;
|
|
frames_.pc_ = pc;
|
|
frames_.Unpoison();
|
|
}
|
|
|
|
StackFrameIterator::StackFrameIterator(const StackFrameIterator& orig)
|
|
: validate_(orig.validate_),
|
|
entry_(orig.thread_),
|
|
exit_(orig.thread_),
|
|
frames_(orig.thread_),
|
|
current_frame_(nullptr),
|
|
thread_(orig.thread_) {
|
|
frames_.fp_ = orig.frames_.fp_;
|
|
frames_.sp_ = orig.frames_.sp_;
|
|
frames_.pc_ = orig.frames_.pc_;
|
|
frames_.Unpoison();
|
|
}
|
|
|
|
StackFrame* StackFrameIterator::NextFrame() {
|
|
// When we are at the start of iteration after having created an
|
|
// iterator object, current_frame_ will be nullptr as we haven't seen
|
|
// any frames yet (unless we start iterating in the simulator from a given
|
|
// triplet of fp, sp, and pc). At this point, if NextFrame is called, it tries
|
|
// to set up the next exit frame by reading the top_exit_frame_info
|
|
// from the isolate. If we do not have any dart invocations yet,
|
|
// top_exit_frame_info will be 0 and so we would return nullptr.
|
|
|
|
// current_frame_ will also be nullptr, when we are at the end of having
|
|
// iterated through all the frames. If NextFrame is called at this
|
|
// point, we will try and set up the next exit frame, but since we are
|
|
// at the end of the iteration, fp_ will be 0 and we would return nullptr.
|
|
if (current_frame_ == nullptr) {
|
|
if (!HasNextFrame()) {
|
|
return nullptr;
|
|
}
|
|
if (frames_.pc_ == 0) {
|
|
// Iteration starts from an exit frame given by its fp.
|
|
current_frame_ = NextExitFrame();
|
|
} else if (*(reinterpret_cast<uword*>(
|
|
frames_.fp_ + (kSavedCallerFpSlotFromFp * kWordSize))) ==
|
|
0) {
|
|
// Iteration starts from an entry frame given by its fp, sp, and pc.
|
|
current_frame_ = NextEntryFrame();
|
|
} else {
|
|
// Iteration starts from a Dart or stub frame given by its fp, sp, and pc.
|
|
current_frame_ = frames_.NextFrame(validate_);
|
|
}
|
|
return current_frame_;
|
|
}
|
|
ASSERT(!validate_ || current_frame_->IsValid());
|
|
if (current_frame_->IsEntryFrame()) {
|
|
if (HasNextFrame()) { // We have another chained block.
|
|
current_frame_ = NextExitFrame();
|
|
return current_frame_;
|
|
}
|
|
current_frame_ = nullptr; // No more frames.
|
|
return current_frame_;
|
|
}
|
|
ASSERT(!validate_ || current_frame_->IsExitFrame() ||
|
|
current_frame_->IsDartFrame(validate_) ||
|
|
current_frame_->IsStubFrame());
|
|
|
|
// Consume dart/stub frames using StackFrameIterator::FrameSetIterator
|
|
// until we are out of dart/stub frames at which point we return the
|
|
// corresponding entry frame for that set of dart/stub frames.
|
|
current_frame_ =
|
|
(frames_.HasNext()) ? frames_.NextFrame(validate_) : NextEntryFrame();
|
|
return current_frame_;
|
|
}
|
|
|
|
// Tell MemorySanitizer that generated code initializes part of the stack.
|
|
void StackFrameIterator::FrameSetIterator::Unpoison() {
|
|
// When using a simulator, all writes to the stack happened from MSAN
|
|
// instrumented C++, so there is nothing to unpoison. Additionally,
|
|
// fp_ will be somewhere in the simulator's stack instead of the OSThread's
|
|
// stack.
|
|
#if !defined(USING_SIMULATOR)
|
|
if (fp_ == 0) return;
|
|
// Note that Thread::os_thread_ is cleared when the thread is descheduled.
|
|
ASSERT((thread_->os_thread() == nullptr) ||
|
|
((thread_->os_thread()->stack_limit() < fp_) &&
|
|
(thread_->os_thread()->stack_base() > fp_)));
|
|
uword lower;
|
|
if (sp_ == 0) {
|
|
// Exit frame: guess sp.
|
|
lower = fp_ - kDartFrameFixedSize * kWordSize;
|
|
} else {
|
|
lower = sp_;
|
|
}
|
|
uword upper = fp_ + kSavedCallerPcSlotFromFp * kWordSize;
|
|
// Both lower and upper are inclusive, so we add one word when computing size.
|
|
MSAN_UNPOISON(reinterpret_cast<void*>(lower), upper - lower + kWordSize);
|
|
#endif // !defined(USING_SIMULATOR)
|
|
}
|
|
|
|
StackFrame* StackFrameIterator::FrameSetIterator::NextFrame(bool validate) {
|
|
StackFrame* frame;
|
|
ASSERT(HasNext());
|
|
frame = &stack_frame_;
|
|
frame->sp_ = sp_;
|
|
frame->fp_ = fp_;
|
|
frame->pc_ = pc_;
|
|
sp_ = frame->GetCallerSp();
|
|
fp_ = frame->GetCallerFp();
|
|
pc_ = frame->GetCallerPc();
|
|
Unpoison();
|
|
ASSERT(!validate || frame->IsValid());
|
|
return frame;
|
|
}
|
|
|
|
ExitFrame* StackFrameIterator::NextExitFrame() {
|
|
exit_.sp_ = frames_.sp_;
|
|
exit_.fp_ = frames_.fp_;
|
|
exit_.pc_ = frames_.pc_;
|
|
frames_.sp_ = exit_.GetCallerSp();
|
|
frames_.fp_ = exit_.GetCallerFp();
|
|
frames_.pc_ = exit_.GetCallerPc();
|
|
frames_.Unpoison();
|
|
ASSERT(!validate_ || exit_.IsValid());
|
|
return &exit_;
|
|
}
|
|
|
|
EntryFrame* StackFrameIterator::NextEntryFrame() {
|
|
ASSERT(!frames_.HasNext());
|
|
entry_.sp_ = frames_.sp_;
|
|
entry_.fp_ = frames_.fp_;
|
|
entry_.pc_ = frames_.pc_;
|
|
SetupNextExitFrameData(); // Setup data for next exit frame in chain.
|
|
ASSERT(!validate_ || entry_.IsValid());
|
|
return &entry_;
|
|
}
|
|
|
|
InlinedFunctionsIterator::InlinedFunctionsIterator(const Code& code, uword pc)
|
|
: index_(0),
|
|
num_materializations_(0),
|
|
dest_frame_size_(0),
|
|
code_(Code::Handle(code.ptr())),
|
|
deopt_info_(TypedData::Handle()),
|
|
function_(Function::Handle()),
|
|
pc_(pc),
|
|
deopt_instructions_(),
|
|
object_table_(ObjectPool::Handle()) {
|
|
ASSERT(code_.is_optimized());
|
|
ASSERT(pc_ != 0);
|
|
ASSERT(code.ContainsInstructionAt(pc));
|
|
#if defined(DART_PRECOMPILED_RUNTIME)
|
|
ASSERT(deopt_info_.IsNull());
|
|
function_ = code_.function();
|
|
#else
|
|
ICData::DeoptReasonId deopt_reason = ICData::kDeoptUnknown;
|
|
uint32_t deopt_flags = 0;
|
|
deopt_info_ = code_.GetDeoptInfoAtPc(pc, &deopt_reason, &deopt_flags);
|
|
if (deopt_info_.IsNull()) {
|
|
// This is the case when a call without deopt info in optimized code
|
|
// throws an exception. (e.g. in the parameter copying prologue).
|
|
// In that case there won't be any inlined frames.
|
|
function_ = code_.function();
|
|
} else {
|
|
// Unpack deopt info into instructions (translate away suffixes).
|
|
const Array& deopt_table = Array::Handle(code_.deopt_info_array());
|
|
ASSERT(!deopt_table.IsNull());
|
|
DeoptInfo::Unpack(deopt_table, deopt_info_, &deopt_instructions_);
|
|
num_materializations_ = DeoptInfo::NumMaterializations(deopt_instructions_);
|
|
dest_frame_size_ = DeoptInfo::FrameSize(deopt_info_);
|
|
object_table_ = code_.GetObjectPool();
|
|
Advance();
|
|
}
|
|
#endif // defined(DART_PRECOMPILED_RUNTIME)
|
|
}
|
|
|
|
void InlinedFunctionsIterator::Advance() {
|
|
// Iterate over the deopt instructions and determine the inlined
|
|
// functions if any and iterate over them.
|
|
ASSERT(!Done());
|
|
|
|
#if defined(DART_PRECOMPILED_RUNTIME)
|
|
ASSERT(deopt_info_.IsNull());
|
|
SetDone();
|
|
return;
|
|
#else
|
|
if (deopt_info_.IsNull()) {
|
|
SetDone();
|
|
return;
|
|
}
|
|
|
|
ASSERT(deopt_instructions_.length() != 0);
|
|
while (index_ < deopt_instructions_.length()) {
|
|
DeoptInstr* deopt_instr = deopt_instructions_[index_++];
|
|
if (deopt_instr->kind() == DeoptInstr::kRetAddress) {
|
|
pc_ = DeoptInstr::GetRetAddress(deopt_instr, object_table_, &code_);
|
|
function_ = code_.function();
|
|
return;
|
|
}
|
|
}
|
|
SetDone();
|
|
#endif // defined(DART_PRECOMPILED_RUNTIME)
|
|
}
|
|
|
|
#if !defined(DART_PRECOMPILED_RUNTIME)
|
|
// Finds the potential offset for the current function's FP if the
|
|
// current frame were to be deoptimized.
|
|
intptr_t InlinedFunctionsIterator::GetDeoptFpOffset() const {
|
|
ASSERT(deopt_instructions_.length() != 0);
|
|
for (intptr_t index = index_; index < deopt_instructions_.length(); index++) {
|
|
DeoptInstr* deopt_instr = deopt_instructions_[index];
|
|
if (deopt_instr->kind() == DeoptInstr::kCallerFp) {
|
|
return index - num_materializations_ - kSavedCallerFpSlotFromFp;
|
|
}
|
|
}
|
|
UNREACHABLE();
|
|
return 0;
|
|
}
|
|
#endif // !defined(DART_PRECOMPILED_RUNTIME)
|
|
|
|
#if defined(DEBUG)
|
|
void ValidateFrames() {
|
|
StackFrameIterator frames(ValidationPolicy::kValidateFrames,
|
|
Thread::Current(),
|
|
StackFrameIterator::kNoCrossThreadIteration);
|
|
StackFrame* frame = frames.NextFrame();
|
|
while (frame != nullptr) {
|
|
frame = frames.NextFrame();
|
|
}
|
|
}
|
|
#endif
|
|
|
|
} // namespace dart
|