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![Alexander Markov](/assets/img/avatar_default.png)
This is a reland of commit bc8afad855
On top of the original commit, this change fixes incorrect
propagation of async/async*/sync* modifiers from a function to
its dynamic invocation forwarder.
TEST=ci, runtime/tests/vm/dart/regress_b_238653741_test.dart
Fixes b/238653741
Issue: https://github.com/dart-lang/sdk/issues/48378
Original change's description:
> [vm] Cleanup old async/async*/sync* implementation from the VM
>
> TEST=ci
>
> Issue: https://github.com/dart-lang/sdk/issues/48378
> Change-Id: I089ba4ed5613f30eec29f0db4ac6d5d8fbffd185
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/249980
> Reviewed-by: Martin Kustermann <kustermann@google.com>
> Reviewed-by: Slava Egorov <vegorov@google.com>
> Commit-Queue: Alexander Markov <alexmarkov@google.com>
Change-Id: Iaad033d974a23fc6c5880a3d7f41818eb117f839
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/251300
Commit-Queue: Alexander Markov <alexmarkov@google.com>
Reviewed-by: Slava Egorov <vegorov@google.com>
646 lines
25 KiB
C++
646 lines
25 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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#if !defined(DART_PRECOMPILED_RUNTIME)
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#include "vm/scopes.h"
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#include "vm/compiler/backend/slot.h"
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#include "vm/object.h"
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#include "vm/object_store.h"
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#include "vm/stack_frame.h"
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#include "vm/symbols.h"
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namespace dart {
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DEFINE_FLAG(bool,
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share_enclosing_context,
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true,
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"Allocate captured variables in the existing context of an "
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"enclosing scope (up to innermost loop) and spare the allocation "
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"of a local context.");
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LocalScope::LocalScope(LocalScope* parent, int function_level, int loop_level)
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: parent_(parent),
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child_(NULL),
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sibling_(NULL),
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function_level_(function_level),
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loop_level_(loop_level),
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context_level_(LocalScope::kUninitializedContextLevel),
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begin_token_pos_(TokenPosition::kNoSource),
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end_token_pos_(TokenPosition::kNoSource),
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variables_(),
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context_variables_(),
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context_slots_(new (Thread::Current()->zone())
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ZoneGrowableArray<const Slot*>()) {
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// Hook this node into the children of the parent, unless the parent has a
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// different function_level, since the local scope of a nested function can
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// be discarded after it has been parsed.
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if ((parent != NULL) && (parent->function_level() == function_level)) {
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sibling_ = parent->child_;
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parent->child_ = this;
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}
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}
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bool LocalScope::IsNestedWithin(LocalScope* scope) const {
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const LocalScope* current_scope = this;
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while (current_scope != NULL) {
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if (current_scope == scope) {
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return true;
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}
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current_scope = current_scope->parent();
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}
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return false;
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}
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bool LocalScope::AddVariable(LocalVariable* variable) {
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ASSERT(variable != NULL);
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if (LocalLookupVariable(variable->name()) != NULL) {
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return false;
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}
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variables_.Add(variable);
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if (variable->owner() == NULL) {
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// Variables must be added to their owner scope first. Subsequent calls
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// to 'add' treat the variable as an alias.
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variable->set_owner(this);
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}
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return true;
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}
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bool LocalScope::InsertParameterAt(intptr_t pos, LocalVariable* parameter) {
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ASSERT(parameter != NULL);
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if (LocalLookupVariable(parameter->name()) != NULL) {
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return false;
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}
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variables_.InsertAt(pos, parameter);
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// InsertParameterAt is not used to add aliases of parameters.
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ASSERT(parameter->owner() == NULL);
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parameter->set_owner(this);
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return true;
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}
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void LocalScope::AllocateContextVariable(LocalVariable* variable,
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LocalScope** context_owner) {
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ASSERT(variable->is_captured());
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ASSERT(variable->owner() == this);
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// The context level in the owner scope of a captured variable indicates at
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// code generation time how far to walk up the context chain in order to
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// access the variable from the current context level.
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if ((*context_owner) == NULL) {
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ASSERT(num_context_variables() == 0);
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// This scope becomes the current context owner.
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set_context_level(1);
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*context_owner = this;
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} else if (!FLAG_share_enclosing_context && ((*context_owner) != this)) {
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// The captured variable is in a child scope of the context owner and we do
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// not share contexts.
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// This scope will allocate and chain a new context.
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ASSERT(num_context_variables() == 0);
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// This scope becomes the current context owner.
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set_context_level((*context_owner)->context_level() + 1);
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*context_owner = this;
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} else if ((*context_owner)->loop_level() < loop_level()) {
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ASSERT(FLAG_share_enclosing_context);
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// The captured variable is at a deeper loop level than the current context.
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// This scope will allocate and chain a new context.
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ASSERT(num_context_variables() == 0);
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// This scope becomes the current context owner.
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set_context_level((*context_owner)->context_level() + 1);
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*context_owner = this;
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} else {
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// Allocate the captured variable in the current context.
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if (!HasContextLevel()) {
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ASSERT(variable->owner() != *context_owner);
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set_context_level((*context_owner)->context_level());
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} else {
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ASSERT(context_level() == (*context_owner)->context_level());
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}
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}
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(*context_owner)->AddContextVariable(variable);
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}
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void LocalScope::AddContextVariable(LocalVariable* variable) {
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variable->set_index(VariableIndex(context_variables_.length()));
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context_variables_.Add(variable);
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context_slots_->Add(
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&Slot::GetContextVariableSlotFor(Thread::Current(), *variable));
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}
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VariableIndex LocalScope::AllocateVariables(const Function& function,
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VariableIndex first_parameter_index,
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int num_parameters,
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VariableIndex first_local_index,
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LocalScope* context_owner,
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bool* found_captured_variables) {
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// We should not allocate variables of nested functions while compiling an
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// enclosing function.
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ASSERT(function_level() == 0);
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ASSERT(num_parameters >= 0);
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// Parameters must be listed first and must all appear in the top scope.
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ASSERT(num_parameters <= num_variables());
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int pos = 0; // Current variable position.
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VariableIndex next_index =
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first_parameter_index; // Current free frame index.
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LocalVariable* chained_future = nullptr;
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LocalVariable* suspend_state_var = nullptr;
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for (intptr_t i = 0; i < num_variables(); i++) {
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LocalVariable* variable = VariableAt(i);
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if (variable->owner() == this) {
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if (variable->is_captured()) {
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if (variable->is_chained_future()) {
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chained_future = variable;
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}
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} else {
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if (variable->name().Equals(Symbols::SuspendStateVar())) {
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suspend_state_var = variable;
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}
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}
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}
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}
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if (chained_future != nullptr) {
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AllocateContextVariable(chained_future, &context_owner);
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*found_captured_variables = true;
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// Remember context indices of _future variables in _Future.timeout and
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// Future.wait. They are used while collecting async stack traces.
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if (function.recognized_kind() == MethodRecognizer::kFutureTimeout) {
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#ifdef DEBUG
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auto old_value = IsolateGroup::Current()
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->object_store()
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->future_timeout_future_index();
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ASSERT(old_value == Object::null() ||
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Smi::Value(old_value) == chained_future->index().value());
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#endif // DEBUG
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IsolateGroup::Current()->object_store()->set_future_timeout_future_index(
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Smi::Handle(Smi::New(chained_future->index().value())));
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} else if (function.recognized_kind() == MethodRecognizer::kFutureWait) {
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#ifdef DEBUG
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auto old_value =
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IsolateGroup::Current()->object_store()->future_wait_future_index();
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ASSERT(old_value == Object::null() ||
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Smi::Value(old_value) == chained_future->index().value());
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#endif // DEBUG
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IsolateGroup::Current()->object_store()->set_future_wait_future_index(
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Smi::Handle(Smi::New(chained_future->index().value())));
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} else {
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UNREACHABLE();
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}
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}
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if (suspend_state_var != nullptr) {
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suspend_state_var->set_index(
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VariableIndex(SuspendState::kSuspendStateVarIndex));
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ASSERT(next_index.value() == SuspendState::kSuspendStateVarIndex - 1);
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}
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while (pos < num_parameters) {
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LocalVariable* parameter = VariableAt(pos);
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pos++;
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// Parsing formal parameter default values may add local variable aliases
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// to the local scope before the formal parameters are added. However,
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// the parameters get inserted in front of the aliases, therefore, no
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// aliases can be encountered among the first num_parameters variables.
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ASSERT(parameter->owner() == this);
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if (parameter->is_captured()) {
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// A captured parameter has a slot allocated in the frame and one in the
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// context, where it gets copied to. The parameter index reflects the
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// context allocation index.
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next_index = VariableIndex(next_index.value() - 1);
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AllocateContextVariable(parameter, &context_owner);
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*found_captured_variables = true;
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} else {
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parameter->set_index(next_index);
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next_index = VariableIndex(next_index.value() - 1);
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}
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}
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// No overlapping of parameters and locals.
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ASSERT(next_index.value() >= first_local_index.value());
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next_index = first_local_index;
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while (pos < num_variables()) {
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LocalVariable* variable = VariableAt(pos);
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if (variable->owner() == this) {
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if (variable->is_captured()) {
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// Skip the variables already pre-allocated above.
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if (variable != chained_future) {
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AllocateContextVariable(variable, &context_owner);
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*found_captured_variables = true;
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}
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} else {
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if (variable != suspend_state_var) {
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variable->set_index(next_index);
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next_index = VariableIndex(next_index.value() - 1);
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}
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}
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}
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pos++;
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}
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// Allocate variables of all children.
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VariableIndex min_index = next_index;
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LocalScope* child = this->child();
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while (child != NULL) {
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// Ignored, since no parameters.
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const VariableIndex dummy_parameter_index(0);
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// No parameters in children scopes.
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const int num_parameters_in_child = 0;
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VariableIndex child_next_index = child->AllocateVariables(
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function, dummy_parameter_index, num_parameters_in_child, next_index,
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context_owner, found_captured_variables);
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if (child_next_index.value() < min_index.value()) {
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min_index = child_next_index;
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}
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child = child->sibling();
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}
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return min_index;
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}
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// The parser creates internal variables that start with ":"
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static bool IsFilteredIdentifier(const String& str) {
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ASSERT(str.Length() > 0);
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if (str.ptr() == Symbols::FunctionTypeArgumentsVar().ptr()) {
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// Keep :function_type_arguments for accessing type variables in debugging.
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return false;
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}
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return str.CharAt(0) == ':';
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}
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LocalVarDescriptorsPtr LocalScope::GetVarDescriptors(
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const Function& func,
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ZoneGrowableArray<intptr_t>* context_level_array) {
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LocalVarDescriptorsBuilder vars;
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vars.AddDeoptIdToContextLevelMappings(context_level_array);
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// First enter all variables from scopes of outer functions.
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const ContextScope& context_scope =
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ContextScope::Handle(func.context_scope());
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if (!context_scope.IsNull()) {
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ASSERT(func.HasParent());
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for (int i = 0; i < context_scope.num_variables(); i++) {
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String& name = String::Handle(context_scope.NameAt(i));
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UntaggedLocalVarDescriptors::VarInfoKind kind;
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if (!IsFilteredIdentifier(name)) {
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kind = UntaggedLocalVarDescriptors::kContextVar;
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} else {
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continue;
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}
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LocalVarDescriptorsBuilder::VarDesc desc;
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desc.name = &name;
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desc.info.set_kind(kind);
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desc.info.scope_id = context_scope.ContextLevelAt(i);
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desc.info.declaration_pos = context_scope.DeclarationTokenIndexAt(i);
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desc.info.begin_pos = begin_token_pos();
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desc.info.end_pos = end_token_pos();
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ASSERT((desc.info.begin_pos.IsReal() != desc.info.end_pos.IsReal()) ||
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(desc.info.begin_pos <= desc.info.end_pos));
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desc.info.set_index(context_scope.ContextIndexAt(i));
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vars.Add(desc);
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}
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}
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// Now collect all variables from local scopes.
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int16_t scope_id = 0;
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CollectLocalVariables(&vars, &scope_id);
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return vars.Done();
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}
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// Add visible variables that are declared in this scope to vars, then
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// collect visible variables of children, followed by siblings.
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void LocalScope::CollectLocalVariables(LocalVarDescriptorsBuilder* vars,
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int16_t* scope_id) {
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(*scope_id)++;
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for (int i = 0; i < this->variables_.length(); i++) {
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LocalVariable* var = variables_[i];
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if ((var->owner() == this) && !var->is_invisible()) {
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if (var->name().ptr() == Symbols::CurrentContextVar().ptr()) {
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// This is the local variable in which the function saves its
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// own context before calling a closure function.
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LocalVarDescriptorsBuilder::VarDesc desc;
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desc.name = &var->name();
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desc.info.set_kind(UntaggedLocalVarDescriptors::kSavedCurrentContext);
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desc.info.scope_id = 0;
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desc.info.declaration_pos = TokenPosition::kMinSource;
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desc.info.begin_pos = TokenPosition::kMinSource;
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desc.info.end_pos = TokenPosition::kMinSource;
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desc.info.set_index(var->index().value());
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vars->Add(desc);
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} else if (!IsFilteredIdentifier(var->name())) {
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// This is a regular Dart variable, either stack-based or captured.
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LocalVarDescriptorsBuilder::VarDesc desc;
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desc.name = &var->name();
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if (var->is_captured()) {
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desc.info.set_kind(UntaggedLocalVarDescriptors::kContextVar);
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ASSERT(var->owner() != NULL);
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ASSERT(var->owner()->context_level() >= 0);
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desc.info.scope_id = var->owner()->context_level();
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} else {
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desc.info.set_kind(UntaggedLocalVarDescriptors::kStackVar);
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desc.info.scope_id = *scope_id;
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}
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desc.info.set_index(var->index().value());
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desc.info.declaration_pos = var->declaration_token_pos();
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desc.info.begin_pos = var->token_pos();
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desc.info.end_pos = var->owner()->end_token_pos();
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vars->Add(desc);
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}
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}
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}
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LocalScope* child = this->child();
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while (child != NULL) {
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child->CollectLocalVariables(vars, scope_id);
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child = child->sibling();
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}
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}
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LocalVariable* LocalScope::LocalLookupVariable(const String& name) const {
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ASSERT(name.IsSymbol());
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for (intptr_t i = 0; i < variables_.length(); i++) {
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LocalVariable* var = variables_[i];
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ASSERT(var->name().IsSymbol());
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if (var->name().ptr() == name.ptr()) {
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return var;
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}
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}
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return NULL;
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}
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LocalVariable* LocalScope::LookupVariable(const String& name, bool test_only) {
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LocalScope* current_scope = this;
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while (current_scope != NULL) {
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LocalVariable* var = current_scope->LocalLookupVariable(name);
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// If testing only, return the variable even if invisible.
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if ((var != NULL) && (!var->is_invisible_ || test_only)) {
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if (!test_only && (var->owner()->function_level() != function_level())) {
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CaptureVariable(var);
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}
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return var;
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}
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current_scope = current_scope->parent();
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}
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return NULL;
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}
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void LocalScope::CaptureVariable(LocalVariable* variable) {
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ASSERT(variable != NULL);
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// The variable must exist in an enclosing scope, not necessarily in this one.
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variable->set_is_captured();
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const int variable_function_level = variable->owner()->function_level();
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LocalScope* scope = this;
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while (scope->function_level() != variable_function_level) {
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// Insert an alias of the variable in the top scope of each function
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// level so that the variable is found in the context.
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LocalScope* parent_scope = scope->parent();
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while ((parent_scope != NULL) &&
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(parent_scope->function_level() == scope->function_level())) {
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scope = parent_scope;
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parent_scope = scope->parent();
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}
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// An alias may already have been added in this scope, and in that case,
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// in parent scopes as needed. If so, we are done.
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if (!scope->AddVariable(variable)) {
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return;
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}
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ASSERT(variable->owner() != scope); // Item is an alias.
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scope = parent_scope;
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}
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}
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int LocalScope::NumCapturedVariables() const {
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// It is not necessary to traverse parent scopes, since we are only interested
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// in the captured variables referenced in this scope. If this scope is the
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// top scope at function level 1 and it (or its children scopes) references a
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// captured variable declared in a parent scope at function level 0, it will
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// contain an alias for that variable.
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// Since code generation for nested functions is postponed until first
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// invocation, the function level of the closure scope can only be 1.
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ASSERT(function_level() == 1);
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int num_captured = 0;
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for (int i = 0; i < num_variables(); i++) {
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LocalVariable* variable = VariableAt(i);
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// Count the aliases of captured variables belonging to outer scopes.
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if (variable->owner()->function_level() != 1) {
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ASSERT(variable->is_captured());
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ASSERT(variable->owner()->function_level() == 0);
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num_captured++;
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}
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}
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return num_captured;
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}
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ContextScopePtr LocalScope::PreserveOuterScope(
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int current_context_level) const {
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// Since code generation for nested functions is postponed until first
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// invocation, the function level of the closure scope can only be 1.
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ASSERT(function_level() == 1);
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// Count the number of referenced captured variables.
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intptr_t num_captured_vars = NumCapturedVariables();
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// Create a ContextScope with space for num_captured_vars descriptors.
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const ContextScope& context_scope =
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ContextScope::Handle(ContextScope::New(num_captured_vars, false));
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// Create a descriptor for each referenced captured variable of enclosing
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// functions to preserve its name and its context allocation information.
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int captured_idx = 0;
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for (int i = 0; i < num_variables(); i++) {
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LocalVariable* variable = VariableAt(i);
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// Preserve the aliases of captured variables belonging to outer scopes.
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if (variable->owner()->function_level() != 1) {
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context_scope.SetTokenIndexAt(captured_idx, variable->token_pos());
|
|
context_scope.SetDeclarationTokenIndexAt(
|
|
captured_idx, variable->declaration_token_pos());
|
|
context_scope.SetNameAt(captured_idx, variable->name());
|
|
context_scope.ClearFlagsAt(captured_idx);
|
|
context_scope.SetIsFinalAt(captured_idx, variable->is_final());
|
|
context_scope.SetIsLateAt(captured_idx, variable->is_late());
|
|
if (variable->is_late()) {
|
|
context_scope.SetLateInitOffsetAt(captured_idx,
|
|
variable->late_init_offset());
|
|
}
|
|
context_scope.SetIsConstAt(captured_idx, variable->IsConst());
|
|
if (variable->IsConst()) {
|
|
context_scope.SetConstValueAt(captured_idx, *variable->ConstValue());
|
|
} else {
|
|
context_scope.SetTypeAt(captured_idx, variable->type());
|
|
}
|
|
context_scope.SetContextIndexAt(captured_idx, variable->index().value());
|
|
// Adjust the context level relative to the current context level,
|
|
// since the context of the current scope will be at level 0 when
|
|
// compiling the nested function.
|
|
int adjusted_context_level =
|
|
variable->owner()->context_level() - current_context_level;
|
|
context_scope.SetContextLevelAt(captured_idx, adjusted_context_level);
|
|
captured_idx++;
|
|
}
|
|
}
|
|
ASSERT(context_scope.num_variables() == captured_idx); // Verify count.
|
|
return context_scope.ptr();
|
|
}
|
|
|
|
LocalScope* LocalScope::RestoreOuterScope(const ContextScope& context_scope) {
|
|
// The function level of the outer scope is one less than the function level
|
|
// of the current function, which is 0.
|
|
LocalScope* outer_scope = new LocalScope(NULL, -1, 0);
|
|
// Add all variables as aliases to the outer scope.
|
|
for (int i = 0; i < context_scope.num_variables(); i++) {
|
|
LocalVariable* variable;
|
|
if (context_scope.IsConstAt(i)) {
|
|
variable = new LocalVariable(context_scope.DeclarationTokenIndexAt(i),
|
|
context_scope.TokenIndexAt(i),
|
|
String::ZoneHandle(context_scope.NameAt(i)),
|
|
Object::dynamic_type());
|
|
variable->SetConstValue(
|
|
Instance::ZoneHandle(context_scope.ConstValueAt(i)));
|
|
} else {
|
|
variable =
|
|
new LocalVariable(context_scope.DeclarationTokenIndexAt(i),
|
|
context_scope.TokenIndexAt(i),
|
|
String::ZoneHandle(context_scope.NameAt(i)),
|
|
AbstractType::ZoneHandle(context_scope.TypeAt(i)));
|
|
}
|
|
variable->set_is_captured();
|
|
variable->set_index(VariableIndex(context_scope.ContextIndexAt(i)));
|
|
if (context_scope.IsFinalAt(i)) {
|
|
variable->set_is_final();
|
|
}
|
|
if (context_scope.IsLateAt(i)) {
|
|
variable->set_is_late();
|
|
variable->set_late_init_offset(context_scope.LateInitOffsetAt(i));
|
|
}
|
|
// Create a fake owner scope describing the index and context level of the
|
|
// variable. Function level and loop level are unused (set to 0), since
|
|
// context level has already been assigned.
|
|
LocalScope* owner_scope = new LocalScope(NULL, 0, 0);
|
|
owner_scope->set_context_level(context_scope.ContextLevelAt(i));
|
|
owner_scope->AddVariable(variable);
|
|
outer_scope->AddVariable(variable); // As alias.
|
|
ASSERT(variable->owner() == owner_scope);
|
|
}
|
|
return outer_scope;
|
|
}
|
|
|
|
void LocalScope::CaptureLocalVariables(LocalScope* top_scope) {
|
|
ASSERT(top_scope->function_level() == function_level());
|
|
LocalScope* scope = this;
|
|
while (scope != top_scope->parent()) {
|
|
for (intptr_t i = 0; i < scope->num_variables(); i++) {
|
|
LocalVariable* variable = scope->VariableAt(i);
|
|
if (variable->is_forced_stack() ||
|
|
(variable->name().ptr() == Symbols::ExceptionVar().ptr()) ||
|
|
(variable->name().ptr() == Symbols::SavedTryContextVar().ptr()) ||
|
|
(variable->name().ptr() == Symbols::ArgDescVar().ptr()) ||
|
|
(variable->name().ptr() ==
|
|
Symbols::FunctionTypeArgumentsVar().ptr())) {
|
|
// Don't capture those variables because the VM expects them to be on
|
|
// the stack.
|
|
continue;
|
|
}
|
|
scope->CaptureVariable(variable);
|
|
}
|
|
scope = scope->parent();
|
|
}
|
|
}
|
|
|
|
ContextScopePtr LocalScope::CreateImplicitClosureScope(const Function& func) {
|
|
static const intptr_t kNumCapturedVars = 1;
|
|
|
|
// Create a ContextScope with space for kNumCapturedVars descriptors.
|
|
const ContextScope& context_scope =
|
|
ContextScope::Handle(ContextScope::New(kNumCapturedVars, true));
|
|
|
|
// Create a descriptor for 'this' variable.
|
|
context_scope.SetTokenIndexAt(0, func.token_pos());
|
|
context_scope.SetDeclarationTokenIndexAt(0, func.token_pos());
|
|
context_scope.SetNameAt(0, Symbols::This());
|
|
context_scope.ClearFlagsAt(0);
|
|
context_scope.SetIsFinalAt(0, true);
|
|
context_scope.SetIsConstAt(0, false);
|
|
const AbstractType& type = AbstractType::Handle(func.ParameterTypeAt(0));
|
|
context_scope.SetTypeAt(0, type);
|
|
context_scope.SetContextIndexAt(0, 0);
|
|
context_scope.SetContextLevelAt(0, 0);
|
|
ASSERT(context_scope.num_variables() == kNumCapturedVars); // Verify count.
|
|
return context_scope.ptr();
|
|
}
|
|
|
|
bool LocalVariable::Equals(const LocalVariable& other) const {
|
|
if (HasIndex() && other.HasIndex() && (index() == other.index())) {
|
|
if (is_captured() == other.is_captured()) {
|
|
if (!is_captured()) {
|
|
return true;
|
|
}
|
|
if (owner()->context_level() == other.owner()->context_level()) {
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
void LocalVarDescriptorsBuilder::AddAll(Zone* zone,
|
|
const LocalVarDescriptors& var_descs) {
|
|
for (intptr_t i = 0, n = var_descs.Length(); i < n; ++i) {
|
|
VarDesc desc;
|
|
desc.name = &String::Handle(zone, var_descs.GetName(i));
|
|
var_descs.GetInfo(i, &desc.info);
|
|
Add(desc);
|
|
}
|
|
}
|
|
|
|
void LocalVarDescriptorsBuilder::AddDeoptIdToContextLevelMappings(
|
|
ZoneGrowableArray<intptr_t>* context_level_array) {
|
|
// Record deopt-id -> context-level mappings, using ranges of deopt-ids with
|
|
// the same context-level. [context_level_array] contains (deopt_id,
|
|
// context_level) tuples.
|
|
for (intptr_t start = 0; start < context_level_array->length();) {
|
|
intptr_t start_deopt_id = (*context_level_array)[start];
|
|
intptr_t start_context_level = (*context_level_array)[start + 1];
|
|
intptr_t end = start;
|
|
intptr_t end_deopt_id = start_deopt_id;
|
|
for (intptr_t peek = start + 2; peek < context_level_array->length();
|
|
peek += 2) {
|
|
intptr_t peek_deopt_id = (*context_level_array)[peek];
|
|
intptr_t peek_context_level = (*context_level_array)[peek + 1];
|
|
// The range encoding assumes the tuples have ascending deopt_ids.
|
|
ASSERT(peek_deopt_id > end_deopt_id);
|
|
if (peek_context_level != start_context_level) break;
|
|
end = peek;
|
|
end_deopt_id = peek_deopt_id;
|
|
}
|
|
|
|
VarDesc desc;
|
|
desc.name = &Symbols::Empty(); // No name.
|
|
desc.info.set_kind(UntaggedLocalVarDescriptors::kContextLevel);
|
|
desc.info.scope_id = 0;
|
|
// We repurpose the token position fields to store deopt IDs in this case.
|
|
desc.info.begin_pos = TokenPosition::Deserialize(start_deopt_id);
|
|
desc.info.end_pos = TokenPosition::Deserialize(end_deopt_id);
|
|
desc.info.set_index(start_context_level);
|
|
Add(desc);
|
|
|
|
start = end + 2;
|
|
}
|
|
}
|
|
|
|
LocalVarDescriptorsPtr LocalVarDescriptorsBuilder::Done() {
|
|
if (vars_.is_empty()) {
|
|
return Object::empty_var_descriptors().ptr();
|
|
}
|
|
const LocalVarDescriptors& var_desc =
|
|
LocalVarDescriptors::Handle(LocalVarDescriptors::New(vars_.length()));
|
|
for (int i = 0; i < vars_.length(); i++) {
|
|
var_desc.SetVar(i, *(vars_[i].name), &vars_[i].info);
|
|
}
|
|
return var_desc.ptr();
|
|
}
|
|
|
|
} // namespace dart
|
|
|
|
#endif // !defined(DART_PRECOMPILED_RUNTIME)
|