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[vm] Cleanup unused SourceLabel and NameReference
TEST=ci Change-Id: Iffe90eca5b84f76ec2a1d22a31939b51f726909b Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/235862 Reviewed-by: Ryan Macnak <rmacnak@google.com> Commit-Queue: Alexander Markov <alexmarkov@google.com>
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@ -35,19 +35,10 @@ class Isolate;
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class LocalScope;
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class LocalVariable;
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struct RegExpCompileData;
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class SourceLabel;
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template <typename T>
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class GrowableArray;
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class Parser;
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struct CatchParamDesc;
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class ClassDesc;
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struct MemberDesc;
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struct ParamList;
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struct QualIdent;
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class TopLevel;
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class RecursionChecker;
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// The class ParsedFunction holds the result of parsing a function.
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class ParsedFunction : public ZoneAllocated {
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public:
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@ -21,11 +21,6 @@ DEFINE_FLAG(bool,
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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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int SourceLabel::FunctionLevel() const {
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ASSERT(owner() != NULL);
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return owner()->function_level();
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}
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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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@ -36,11 +31,9 @@ LocalScope::LocalScope(LocalScope* parent, int function_level, int loop_level)
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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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labels_(),
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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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referenced_() {
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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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@ -87,66 +80,6 @@ bool LocalScope::InsertParameterAt(intptr_t pos, LocalVariable* parameter) {
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return true;
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}
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bool LocalScope::AddLabel(SourceLabel* label) {
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if (LocalLookupLabel(label->name()) != NULL) {
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return false;
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}
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labels_.Add(label);
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if (label->owner() == NULL) {
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// Labels must be added to their owner scope first. Subsequent calls
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// to 'add' treat the label as an alias.
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label->set_owner(this);
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}
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return true;
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}
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void LocalScope::MoveLabel(SourceLabel* label) {
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ASSERT(LocalLookupLabel(label->name()) == NULL);
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ASSERT(label->kind() == SourceLabel::kForward);
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labels_.Add(label);
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label->set_owner(this);
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}
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NameReference* LocalScope::FindReference(const String& name) const {
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ASSERT(name.IsSymbol());
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intptr_t num_references = referenced_.length();
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for (intptr_t i = 0; i < num_references; i++) {
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if (name.ptr() == referenced_[i]->name().ptr()) {
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return referenced_[i];
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}
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}
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return NULL;
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}
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void LocalScope::AddReferencedName(TokenPosition token_pos,
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const String& name) {
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if (LocalLookupVariable(name) != NULL) {
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return;
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}
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NameReference* ref = FindReference(name);
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if (ref != NULL) {
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ref->set_token_pos(token_pos);
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return;
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}
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ref = new NameReference(token_pos, name);
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referenced_.Add(ref);
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// Add name reference in innermost enclosing scopes that do not
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// define a local variable with this name.
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LocalScope* scope = this->parent();
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while (scope != NULL && (scope->LocalLookupVariable(name) == NULL)) {
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scope->referenced_.Add(ref);
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scope = scope->parent();
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}
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}
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TokenPosition LocalScope::PreviousReferencePos(const String& name) const {
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NameReference* ref = FindReference(name);
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if (ref != NULL) {
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return ref->token_pos();
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}
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return TokenPosition::kNoSource;
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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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@ -464,17 +397,6 @@ void LocalScope::CollectLocalVariables(LocalVarDescriptorsBuilder* vars,
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}
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}
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SourceLabel* LocalScope::LocalLookupLabel(const String& name) const {
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ASSERT(name.IsSymbol());
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for (intptr_t i = 0; i < labels_.length(); i++) {
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SourceLabel* label = labels_[i];
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if (label->name().ptr() == name.ptr()) {
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return label;
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}
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}
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return NULL;
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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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@ -529,71 +451,6 @@ void LocalScope::CaptureVariable(LocalVariable* variable) {
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}
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}
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SourceLabel* LocalScope::LookupLabel(const String& name) {
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LocalScope* current_scope = this;
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while (current_scope != NULL) {
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SourceLabel* label = current_scope->LocalLookupLabel(name);
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if (label != NULL) {
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return label;
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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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SourceLabel* LocalScope::LookupInnermostLabel(Token::Kind jump_kind) {
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ASSERT((jump_kind == Token::kCONTINUE) || (jump_kind == Token::kBREAK));
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LocalScope* current_scope = this;
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while (current_scope != NULL) {
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for (intptr_t i = 0; i < current_scope->labels_.length(); i++) {
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SourceLabel* label = current_scope->labels_[i];
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if ((label->kind() == SourceLabel::kWhile) ||
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(label->kind() == SourceLabel::kFor) ||
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(label->kind() == SourceLabel::kDoWhile) ||
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((jump_kind == Token::kBREAK) &&
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(label->kind() == SourceLabel::kSwitch))) {
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return label;
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}
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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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LocalScope* LocalScope::LookupSwitchScope() {
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LocalScope* current_scope = this->parent();
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int this_level = this->function_level();
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while (current_scope != NULL &&
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current_scope->function_level() == this_level) {
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for (int i = 0; i < current_scope->labels_.length(); i++) {
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SourceLabel* label = current_scope->labels_[i];
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if (label->kind() == SourceLabel::kSwitch) {
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// This scope contains a label that is bound to a switch statement,
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// so it is the scope of the a statement body.
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return current_scope;
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}
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}
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current_scope = current_scope->parent();
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}
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// We did not find a switch statement scope at the same function level.
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return NULL;
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}
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SourceLabel* LocalScope::CheckUnresolvedLabels() {
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for (int i = 0; i < this->labels_.length(); i++) {
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SourceLabel* label = this->labels_[i];
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if (label->kind() == SourceLabel::kForward) {
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LocalScope* outer_switch = LookupSwitchScope();
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if (outer_switch == NULL) {
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return label;
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} else {
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outer_switch->MoveLabel(label);
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}
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}
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}
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return NULL;
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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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@ -276,71 +276,6 @@ class LocalVarDescriptorsBuilder : public ValueObject {
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GrowableArray<VarDesc> vars_;
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};
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class NameReference : public ZoneAllocated {
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public:
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NameReference(TokenPosition token_pos, const String& name)
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: token_pos_(token_pos), name_(name) {
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ASSERT(name.IsSymbol());
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}
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const String& name() const { return name_; }
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TokenPosition token_pos() const { return token_pos_; }
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void set_token_pos(TokenPosition value) { token_pos_ = value; }
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private:
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TokenPosition token_pos_;
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const String& name_;
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};
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class SourceLabel : public ZoneAllocated {
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public:
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enum Kind {
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kFor,
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kWhile,
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kDoWhile,
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kSwitch,
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kCase,
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kTry,
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kCatch,
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kForward,
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kStatement // Any statement other than the above
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};
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SourceLabel(TokenPosition token_pos, const String& name, Kind kind)
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: token_pos_(token_pos), name_(name), owner_(NULL), kind_(kind) {
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ASSERT(name.IsSymbol());
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}
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static SourceLabel* New(TokenPosition token_pos, String* name, Kind kind) {
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if (name != NULL) {
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return new SourceLabel(token_pos, *name, kind);
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} else {
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return new SourceLabel(token_pos, Symbols::DefaultLabel(), kind);
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}
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}
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TokenPosition token_pos() const { return token_pos_; }
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const String& name() const { return name_; }
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LocalScope* owner() const { return owner_; }
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void set_owner(LocalScope* owner) { owner_ = owner; }
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Kind kind() const { return kind_; }
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// Returns the function level of the scope in which the label is defined.
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int FunctionLevel() const;
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bool IsUnresolved() { return kind_ == kForward; }
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void ResolveForwardReference() { kind_ = kCase; }
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private:
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const TokenPosition token_pos_;
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const String& name_;
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LocalScope* owner_; // Local scope declaring this label.
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Kind kind_;
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DISALLOW_COPY_AND_ASSIGN(SourceLabel);
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};
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class LocalScope : public ZoneAllocated {
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public:
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LocalScope(LocalScope* parent, int function_level, int loop_level);
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@ -403,19 +338,9 @@ class LocalScope : public ZoneAllocated {
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// Returns false if a variable with the same name is already present.
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bool InsertParameterAt(intptr_t pos, LocalVariable* parameter);
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// Add a label to the scope. Returns false if a label with the same name
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// is already present.
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bool AddLabel(SourceLabel* label);
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// Move an unresolved label of a switch case label to an outer switch.
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void MoveLabel(SourceLabel* label);
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// Lookup a variable in this scope only.
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LocalVariable* LocalLookupVariable(const String& name) const;
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// Lookup a label in this scope only.
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SourceLabel* LocalLookupLabel(const String& name) const;
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// Lookup a variable in this scope and its parents. If the variable
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// is found in a parent scope and 'test_only' is not true, we insert
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// aliases of the variable in the current and intermediate scopes up to
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@ -423,26 +348,9 @@ class LocalScope : public ZoneAllocated {
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// We mark a variable as 'captured' when applicable.
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LocalVariable* LookupVariable(const String& name, bool test_only);
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// Lookup a label in this scope and its parents.
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SourceLabel* LookupLabel(const String& name);
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// Lookup the "innermost" label that labels a for, while, do, or switch
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// statement.
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SourceLabel* LookupInnermostLabel(Token::Kind jump_kind);
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// Lookup scope of outer switch statement at same function level.
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// Returns NULL if this scope is not embedded in a switch.
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LocalScope* LookupSwitchScope();
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// Mark this variable as captured by this scope.
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void CaptureVariable(LocalVariable* variable);
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// Look for unresolved forward references to labels in this scope.
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// If there are any, propagate the forward reference to the next
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// outer scope of a switch statement. If there is no outer switch
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// statement, return the first unresolved label found.
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SourceLabel* CheckUnresolvedLabels();
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// Accessing the variables in the scope.
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intptr_t num_variables() const { return variables_.length(); }
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LocalVariable* VariableAt(intptr_t index) const {
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@ -454,12 +362,6 @@ class LocalScope : public ZoneAllocated {
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// this local scope.
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int NumCapturedVariables() const;
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// Add a reference to the given name into this scope and the enclosing
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// scopes that do not have a local variable declaration for this name
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// already.
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void AddReferencedName(TokenPosition token_pos, const String& name);
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TokenPosition PreviousReferencePos(const String& name) const;
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// Allocate both captured and non-captured variables declared in this scope
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// and in its children scopes of the same function level. Allocating means
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// assigning a frame slot index or a context slot index.
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void CollectLocalVariables(LocalVarDescriptorsBuilder* vars,
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int16_t* scope_id);
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NameReference* FindReference(const String& name) const;
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static const int kUninitializedContextLevel = INT_MIN;
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LocalScope* parent_;
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LocalScope* child_;
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@ -524,17 +424,12 @@ class LocalScope : public ZoneAllocated {
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TokenPosition begin_token_pos_; // Token index of beginning of scope.
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TokenPosition end_token_pos_; // Token index of end of scope.
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GrowableArray<LocalVariable*> variables_;
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GrowableArray<SourceLabel*> labels_;
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// List of variables allocated into the context which is owned by this scope,
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// and their corresponding Slots.
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GrowableArray<LocalVariable*> context_variables_;
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ZoneGrowableArray<const Slot*>* context_slots_;
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// List of names referenced in this scope and its children that
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// are not resolved to local variables.
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GrowableArray<NameReference*> referenced_;
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DISALLOW_COPY_AND_ASSIGN(LocalScope);
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};
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@ -22,9 +22,6 @@ ISOLATE_UNIT_TEST_CASE(LocalScope) {
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const String& c = String::ZoneHandle(Symbols::New(thread, "c"));
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LocalVariable* var_c = new LocalVariable(
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TokenPosition::kNoSource, TokenPosition::kNoSource, c, dynamic_type);
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const String& L = String::ZoneHandle(Symbols::New(thread, "L"));
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SourceLabel* label_L =
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new SourceLabel(TokenPosition::kNoSource, L, SourceLabel::kFor);
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LocalScope* outer_scope = new LocalScope(NULL, 0, 0);
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LocalScope* inner_scope1 = new LocalScope(outer_scope, 0, 0);
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@ -51,13 +48,11 @@ ISOLATE_UNIT_TEST_CASE(LocalScope) {
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EXPECT(outer_scope->AddVariable(var_a));
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EXPECT(inner_scope1->AddVariable(var_b));
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EXPECT(inner_scope2->AddVariable(var_c));
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EXPECT(inner_scope2->AddLabel(label_L));
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EXPECT(!outer_scope->AddVariable(var_a));
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// Check the simple layout above.
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EXPECT_EQ(var_a, outer_scope->LocalLookupVariable(a));
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EXPECT_EQ(var_a, inner_scope1->LookupVariable(a, true));
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EXPECT_EQ(label_L, inner_scope2->LookupLabel(L));
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EXPECT(outer_scope->LocalLookupVariable(b) == NULL);
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EXPECT(inner_scope1->LocalLookupVariable(c) == NULL);
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