src/ast/scopes.h - Issue 2209573002: Separate Scope into DeclarationScope and Scope

Unified Diff: src/ast/scopes.h

Issue 2209573002: Separate Scope into DeclarationScope and Scope (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master

Patch Set: Addressed adamks comments Created 4 years, 4 months ago

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Index: src/ast/scopes.h

diff --git a/src/ast/scopes.h b/src/ast/scopes.h

index 304b877bfacdf803319401502cea2d43778da90c..e7f0b4a3adc4ce0f86bbe177cb5d482cf291dff3 100644

--- a/src/ast/scopes.h

+++ b/src/ast/scopes.h

@@ -84,23 +84,38 @@ class SloppyBlockFunctionMap : public ZoneHashMap {

// a location. Note that many VariableProxy nodes may refer to the same Java-

// Script variable.

+class DeclarationScope;

+// JS environments are represented in the parser using two scope classes, Scope

+// and its subclass DeclarationScope. DeclarationScope is used for any scope

+// that hosts 'var' declarations. This includes script, module, eval, varblock,

+// and function scope. All fields required by such scopes are only available on

+// DeclarationScope.

class Scope: public ZoneObject {

public:

// ---------------------------------------------------------------------------

// Construction

- Scope(Zone* zone, Scope* outer_scope, ScopeType scope_type,

- FunctionKind function_kind = kNormalFunction);

+ Scope(Zone* zone, Scope* outer_scope, ScopeType scope_type);

+#ifdef DEBUG

+ // The scope name is only used for printing/debugging.

+ void SetScopeName(const AstRawString* scope_name) {

+ scope_name_ = scope_name;

+ }

+#endif

+ // TODO(verwaest): Is this needed on Scope?

+ int num_parameters() const;

+ DeclarationScope* AsDeclarationScope();

+ const DeclarationScope* AsDeclarationScope() const;

class Snapshot final BASE_EMBEDDED {

public:

- explicit Snapshot(Scope* scope)

- : outer_scope_(scope),

- top_inner_scope_(scope->inner_scope_),

- top_unresolved_(scope->unresolved_),

- top_temp_(scope->ClosureScope()->temps_.length()) {}

+ explicit Snapshot(Scope* scope);

- void Reparent(Scope* new_parent) const;

+ void Reparent(DeclarationScope* new_parent) const;

private:

Scope* outer_scope_;

@@ -118,16 +133,6 @@ class Scope: public ZoneObject {

Context* context, Scope* script_scope,

AstValueFactory* ast_value_factory);

-#ifdef DEBUG

- // The scope name is only used for printing/debugging.

- void SetScopeName(const AstRawString* scope_name) {

- scope_name_ = scope_name;

- }

-#endif

- void DeclareThis(AstValueFactory* ast_value_factory);

- void DeclareDefaultFunctionVariables(AstValueFactory* ast_value_factory);

// Checks if the block scope is redundant, i.e. it does not contain any

// block scoped declarations. In that case it is removed from the scope

// tree and its children are reparented.

@@ -150,46 +155,18 @@ class Scope: public ZoneObject {

// Lookup a variable in this scope. Returns the variable or NULL if not found.

Variable* LookupLocal(const AstRawString* name);

- // This lookup corresponds to a lookup in the "intermediate" scope sitting

- // between this scope and the outer scope. (ECMA-262, 3rd., requires that

- // the name of named function literal is kept in an intermediate scope

- // in between this scope and the next outer scope.)

- Variable* LookupFunctionVar(const AstRawString* name,

- AstNodeFactory* factory);

// Lookup a variable in this scope or outer scopes.

// Returns the variable or NULL if not found.

Variable* Lookup(const AstRawString* name);

- // Declare the function variable for a function literal. This variable

- // is in an intermediate scope between this function scope and the the

- // outer scope. Only possible for function scopes; at most one variable.

- void DeclareFunctionVar(VariableDeclaration* declaration) {

- DCHECK(is_function_scope());

- // Handle implicit declaration of the function name in named function

- // expressions before other declarations.

- decls_.InsertAt(0, declaration, zone());

- function_ = declaration;

- }

- // Declare a parameter in this scope. When there are duplicated

- // parameters the rightmost one 'wins'. However, the implementation

- // expects all parameters to be declared and from left to right.

- Variable* DeclareParameter(const AstRawString* name, VariableMode mode,

- bool is_optional, bool is_rest, bool* is_duplicate,

- AstValueFactory* ast_value_factory);

// Declare a local variable in this scope. If the variable has been

// declared before, the previously declared variable is returned.

Variable* DeclareLocal(const AstRawString* name, VariableMode mode,

InitializationFlag init_flag, Variable::Kind kind,

MaybeAssignedFlag maybe_assigned_flag = kNotAssigned);

- // Declare an implicit global variable in this scope which must be a

- // script scope. The variable was introduced (possibly from an inner

- // scope) by a reference to an unresolved variable with no intervening

- // with statements or eval calls.

- Variable* DeclareDynamicGlobal(const AstRawString* name);

+ // Declarations list.

+ ZoneList<Declaration*>* declarations() { return &decls_; }

// Create a new unresolved variable.

VariableProxy* NewUnresolved(AstNodeFactory* factory,

@@ -229,23 +206,9 @@ class Scope: public ZoneObject {

// In particular, the only way to get hold of the temporary is by keeping the

// Variable* around. The name should not clash with a legitimate variable

// names.

+ // TODO(verwaest): Move to DeclarationScope?

Variable* NewTemporary(const AstRawString* name);

- // Remove a temporary variable. This is for adjusting the scope of

- // temporaries used when desugaring parameter initializers.

- // Returns the index at which it was found in this scope, or -1 if

- // it was not found.

- int RemoveTemporary(Variable* var);

- // Adds a temporary variable in this scope's TemporaryScope. This is for

- // adjusting the scope of temporaries used when desugaring parameter

- // initializers.

- void AddTemporary(Variable* var) {

- // Temporaries are only placed in ClosureScopes.

- DCHECK_EQ(ClosureScope(), this);

- temps_.Add(var, zone());

- }

// Adds the specific declaration node to the list of declarations in

// this scope. The declarations are processed as part of entering

// the scope; see codegen.cc:ProcessDeclarations.

@@ -355,13 +318,8 @@ class Scope: public ZoneObject {

bool is_catch_scope() const { return scope_type_ == CATCH_SCOPE; }

bool is_block_scope() const { return scope_type_ == BLOCK_SCOPE; }

bool is_with_scope() const { return scope_type_ == WITH_SCOPE; }

- bool is_arrow_scope() const {

- return is_function_scope() && IsArrowFunction(function_kind_);

- }

bool is_declaration_scope() const { return is_declaration_scope_; }

- void set_is_declaration_scope() { is_declaration_scope_ = true; }

// Information about which scopes calls eval.

bool calls_eval() const { return scope_calls_eval_; }

bool calls_sloppy_eval() const {

@@ -389,125 +347,15 @@ class Scope: public ZoneObject {

return is_with_scope() || num_heap_slots() > 0;

}

- bool NeedsHomeObject() const {

- return scope_uses_super_property_ ||

- ((scope_calls_eval_ || inner_scope_calls_eval_) &&

- (IsConciseMethod(function_kind()) ||

- IsAccessorFunction(function_kind()) ||

- IsClassConstructor(function_kind())));

- }

// ---------------------------------------------------------------------------

// Accessors.

// The type of this scope.

ScopeType scope_type() const { return scope_type_; }

- FunctionKind function_kind() const { return function_kind_; }

// The language mode of this scope.

LanguageMode language_mode() const { return language_mode_; }

- // The variable corresponding to the 'this' value.

- Variable* receiver() {

- DCHECK(has_this_declaration());

- DCHECK_NOT_NULL(receiver_);

- return receiver_;

- }

- // TODO(wingo): Add a GLOBAL_SCOPE scope type which will lexically allocate

- // "this" (and no other variable) on the native context. Script scopes then

- // will not have a "this" declaration.

- bool has_this_declaration() const {

- return (is_function_scope() && !is_arrow_scope()) || is_module_scope();

- }

- // The variable corresponding to the 'new.target' value.

- Variable* new_target_var() { return new_target_; }

- // The variable holding the function literal for named function

- // literals, or NULL. Only valid for function scopes.

- VariableDeclaration* function() const {

- DCHECK(is_function_scope());

- return function_;

- }

- // Parameters. The left-most parameter has index 0.

- // Only valid for function scopes.

- Variable* parameter(int index) const {

- DCHECK(is_function_scope());

- return params_[index];

- }

- // Returns the default function arity excluding default or rest parameters.

- int default_function_length() const { return arity_; }

- // Returns the number of formal parameters, up to but not including the

- // rest parameter index (if the function has rest parameters), i.e. it

- // says 2 for

- //

- // function foo(a, b) { ... }

- //

- // and

- //

- // function foo(a, b, ...c) { ... }

- //

- // but for

- //

- // function foo(a, b, c = 1) { ... }

- //

- // we return 3 here.

- int num_parameters() const {

- return has_rest_parameter() ? params_.length() - 1 : params_.length();

- }

- // A function can have at most one rest parameter. Returns Variable* or NULL.

- Variable* rest_parameter(int* index) const {

- *index = rest_index_;

- if (rest_index_ < 0) return NULL;

- return rest_parameter_;

- }

- bool has_rest_parameter() const { return rest_index_ >= 0; }

- bool has_simple_parameters() const {

- return has_simple_parameters_;

- }

- // TODO(caitp): manage this state in a better way. PreParser must be able to

- // communicate that the scope is non-simple, without allocating any parameters

- // as the Parser does. This is necessary to ensure that TC39's proposed early

- // error can be reported consistently regardless of whether lazily parsed or

- // not.

- void SetHasNonSimpleParameters() {

- DCHECK(is_function_scope());

- has_simple_parameters_ = false;

- }

- // Retrieve `IsSimpleParameterList` of current or outer function.

- bool HasSimpleParameters() {

- Scope* scope = ClosureScope();

- return !scope->is_function_scope() || scope->has_simple_parameters();

- }

- // The local variable 'arguments' if we need to allocate it; NULL otherwise.

- Variable* arguments() const {

- DCHECK(!is_arrow_scope() || arguments_ == nullptr);

- return arguments_;

- }

- Variable* this_function_var() const {

- // This is only used in derived constructors atm.

- DCHECK(this_function_ == nullptr ||

- (is_function_scope() && (IsClassConstructor(function_kind()) ||

- IsConciseMethod(function_kind()) ||

- IsAccessorFunction(function_kind()))));

- return this_function_;

- }

- // Declarations list.

- ZoneList<Declaration*>* declarations() { return &decls_; }

// inner_scope() and sibling() together implement the inner scope list of a

// scope. Inner scope points to the an inner scope of the function, and

// "sibling" points to a next inner scope of the outer scope of this scope.

@@ -517,9 +365,6 @@ class Scope: public ZoneObject {

// The scope immediately surrounding this scope, or NULL.

Scope* outer_scope() const { return outer_scope_; }

- // The ModuleDescriptor for this scope; only for module scopes.

- ModuleDescriptor* module() const { return module_descriptor_; }

const AstRawString* catch_variable_name() const {

DCHECK(is_catch_scope());

DCHECK_EQ(1, num_var());

@@ -569,18 +414,18 @@ class Scope: public ZoneObject {

// Find the first function, script, eval or (declaration) block scope. This is

// the scope where var declarations will be hoisted to in the implementation.

- Scope* DeclarationScope();

+ DeclarationScope* GetDeclarationScope();

// Find the first non-block declaration scope. This should be either a script,

- // function, or eval scope. Same as DeclarationScope(), but skips

- // declaration "block" scopes. Used for differentiating associated

- // function objects (i.e., the scope for which a function prologue allocates

- // a context) or declaring temporaries.

- Scope* ClosureScope();

+ // function, or eval scope. Same as DeclarationScope(), but skips declaration

+ // "block" scopes. Used for differentiating associated function objects (i.e.,

+ // the scope for which a function prologue allocates a context) or declaring

+ // temporaries.

+ DeclarationScope* GetClosureScope();

// Find the first (non-arrow) function or script scope. This is where

// 'this' is bound, and what determines the function kind.

- Scope* ReceiverScope();

+ DeclarationScope* GetReceiverScope();

Handle<ScopeInfo> GetScopeInfo(Isolate* isolate);

@@ -597,19 +442,8 @@ class Scope: public ZoneObject {

return variables_.Lookup(name) != NULL;

}

- bool IsDeclaredParameter(const AstRawString* name) {

- // If IsSimpleParameterList is false, duplicate parameters are not allowed,

- // however `arguments` may be allowed if function is not strict code. Thus,

- // the assumptions explained above do not hold.

- return params_.Contains(variables_.Lookup(name));

- }

int num_var() const { return variables_.occupancy(); }

- SloppyBlockFunctionMap* sloppy_block_function_map() {

- return &sloppy_block_function_map_;

- }

// To be called during parsing. Do just enough scope analysis that we can

// discard the Scope for lazily compiled functions. In particular, this

// records variables which cannot be resolved inside the Scope (we don't yet

@@ -630,31 +464,21 @@ class Scope: public ZoneObject {

void CheckZones();

#endif

- // ---------------------------------------------------------------------------

- // Implementation.

+ // Retrieve `IsSimpleParameterList` of current or outer function.

+ bool HasSimpleParameters();

private:

// Scope tree.

Scope* outer_scope_; // the immediately enclosing outer scope, or NULL

Scope* inner_scope_; // an inner scope of this scope

Scope* sibling_; // a sibling inner scope of the outer scope of this scope.

- // Debugging support.

-#ifdef DEBUG

- const AstRawString* scope_name_;

-#endif

// The variables declared in this scope:

// All user-declared variables (incl. parameters). For script scopes

// variables may be implicitly 'declared' by being used (possibly in

// an inner scope) with no intervening with statements or eval calls.

VariableMap variables_;

- // Compiler-allocated (user-invisible) temporaries. Due to the implementation

- // of RemoveTemporary(), may contain nulls, which must be skipped-over during

- // allocation and printing.

- ZoneList<Variable*> temps_;

- // Parameter list in source order.

- ZoneList<Variable*> params_;

// Variables that must be looked up dynamically.

DynamicScopePart* dynamics_;

// Unresolved variables referred to from this scope. The proxies themselves

@@ -662,26 +486,9 @@ class Scope: public ZoneObject {

VariableProxy* unresolved_;

// Declarations.

ZoneList<Declaration*> decls_;

- // Convenience variable.

- Variable* receiver_;

- // Function variable, if any; function scopes only.

- VariableDeclaration* function_;

- // new.target variable, function scopes only.

- Variable* new_target_;

- // Convenience variable; function scopes only.

- Variable* arguments_;

- // Convenience variable; Subclass constructor only

- Variable* this_function_;

- // Module descriptor; module scopes only.

- ModuleDescriptor* module_descriptor_;

- // Map of function names to lists of functions defined in sloppy blocks

- SloppyBlockFunctionMap sloppy_block_function_map_;

// The scope type.

const ScopeType scope_type_;

- // If the scope is a function scope, this is the function kind.

- const FunctionKind function_kind_;

// Scope-specific information computed during parsing.

@@ -729,11 +536,6 @@ class Scope: public ZoneObject {

int num_heap_slots_;

int num_global_slots_;

- // Info about the parameter list of a function.

- int arity_;

- int rest_index_;

- Variable* rest_parameter_;

// Serialized scope info support.

Handle<ScopeInfo> scope_info_;

@@ -741,6 +543,11 @@ class Scope: public ZoneObject {

// These variables are looked up dynamically at runtime.

Variable* NonLocal(const AstRawString* name, VariableMode mode);

+// Debugging support.

+#ifdef DEBUG

+ const AstRawString* scope_name_;

+#endif

// Variable resolution.

// Possible results of a recursive variable lookup telling if and how a

// variable is bound. These are returned in the output parameter *binding_kind

@@ -816,7 +623,6 @@ class Scope: public ZoneObject {

// Variable allocation.

void AllocateStackSlot(Variable* var);

void AllocateHeapSlot(Variable* var);

- void AllocateParameterLocals();

void AllocateNonParameterLocal(Variable* var,

AstValueFactory* ast_value_factory);

void AllocateDeclaredGlobal(Variable* var,

@@ -824,8 +630,6 @@ class Scope: public ZoneObject {

void AllocateNonParameterLocalsAndDeclaredGlobals(

AstValueFactory* ast_value_factory);

void AllocateVariablesRecursively(AstValueFactory* ast_value_factory);

- void AllocateParameter(Variable* var, int index);

- void AllocateReceiver();

// Resolve and fill in the allocation information for all variables

// in this scopes. Must be called *after* all scopes have been

@@ -872,6 +676,226 @@ class Scope: public ZoneObject {

void SetDefaults();

PendingCompilationErrorHandler pending_error_handler_;

+ friend class DeclarationScope;

+};

+class DeclarationScope : public Scope {

+ public:

+ DeclarationScope(Zone* zone, Scope* outer_scope, ScopeType scope_type,

+ FunctionKind function_kind = kNormalFunction);

+ DeclarationScope(Zone* zone, Scope* inner_scope, ScopeType scope_type,

+ Handle<ScopeInfo> scope_info);

+ bool IsDeclaredParameter(const AstRawString* name) {

+ // If IsSimpleParameterList is false, duplicate parameters are not allowed,

+ // however `arguments` may be allowed if function is not strict code. Thus,

+ // the assumptions explained above do not hold.

+ return params_.Contains(variables_.Lookup(name));

+ }

+ FunctionKind function_kind() const { return function_kind_; }

+ bool is_arrow_scope() const {

+ return is_function_scope() && IsArrowFunction(function_kind_);

+ }

+ bool NeedsHomeObject() const {

+ return scope_uses_super_property_ ||

+ ((scope_calls_eval_ || inner_scope_calls_eval_) &&

+ (IsConciseMethod(function_kind()) ||

+ IsAccessorFunction(function_kind()) ||

+ IsClassConstructor(function_kind())));

+ }

+ // The ModuleDescriptor for this scope; only for module scopes.

+ // TODO(verwaest): Move to ModuleScope?

+ ModuleDescriptor* module() const { return module_descriptor_; }

+ void DeclareThis(AstValueFactory* ast_value_factory);

+ void DeclareDefaultFunctionVariables(AstValueFactory* ast_value_factory);

+ // This lookup corresponds to a lookup in the "intermediate" scope sitting

+ // between this scope and the outer scope. (ECMA-262, 3rd., requires that

+ // the name of named function literal is kept in an intermediate scope

+ // in between this scope and the next outer scope.)

+ Variable* LookupFunctionVar(const AstRawString* name,

+ AstNodeFactory* factory);

+ // Declare the function variable for a function literal. This variable

+ // is in an intermediate scope between this function scope and the the

+ // outer scope. Only possible for function scopes; at most one variable.

+ void DeclareFunctionVar(VariableDeclaration* declaration) {

+ DCHECK(is_function_scope());

+ // Handle implicit declaration of the function name in named function

+ // expressions before other declarations.

+ declarations()->InsertAt(0, declaration, zone());

+ function_ = declaration;

+ }

+ // Declare a parameter in this scope. When there are duplicated

+ // parameters the rightmost one 'wins'. However, the implementation

+ // expects all parameters to be declared and from left to right.

+ Variable* DeclareParameter(const AstRawString* name, VariableMode mode,

+ bool is_optional, bool is_rest, bool* is_duplicate,

+ AstValueFactory* ast_value_factory);

+ // Declare an implicit global variable in this scope which must be a

+ // script scope. The variable was introduced (possibly from an inner

+ // scope) by a reference to an unresolved variable with no intervening

+ // with statements or eval calls.

+ Variable* DeclareDynamicGlobal(const AstRawString* name);

+ // The variable corresponding to the 'this' value.

+ Variable* receiver() {

+ DCHECK(has_this_declaration());

+ DCHECK_NOT_NULL(receiver_);

+ return receiver_;

+ }

+ // TODO(wingo): Add a GLOBAL_SCOPE scope type which will lexically allocate

+ // "this" (and no other variable) on the native context. Script scopes then

+ // will not have a "this" declaration.

+ bool has_this_declaration() const {

+ return (is_function_scope() && !is_arrow_scope()) || is_module_scope();

+ }

+ // The variable corresponding to the 'new.target' value.

+ Variable* new_target_var() { return new_target_; }

+ // The variable holding the function literal for named function

+ // literals, or NULL. Only valid for function scopes.

+ VariableDeclaration* function() const {

+ DCHECK(is_function_scope());

+ return function_;

+ }

+ // Parameters. The left-most parameter has index 0.

+ // Only valid for function scopes.

+ Variable* parameter(int index) const {

+ DCHECK(is_function_scope());

+ return params_[index];

+ }

+ // Returns the default function arity excluding default or rest parameters.

+ int default_function_length() const { return arity_; }

+ // Returns the number of formal parameters, up to but not including the

+ // rest parameter index (if the function has rest parameters), i.e. it

+ // says 2 for

+ //

+ // function foo(a, b) { ... }

+ //

+ // and

+ //

+ // function foo(a, b, ...c) { ... }

+ //

+ // but for

+ //

+ // function foo(a, b, c = 1) { ... }

+ //

+ // we return 3 here.

+ int num_parameters() const {

+ return has_rest_parameter() ? params_.length() - 1 : params_.length();

+ }

+ // A function can have at most one rest parameter. Returns Variable* or NULL.

+ Variable* rest_parameter(int* index) const {

+ *index = rest_index_;

+ if (rest_index_ < 0) return NULL;

+ return rest_parameter_;

+ }

+ bool has_rest_parameter() const { return rest_index_ >= 0; }

+ bool has_simple_parameters() const { return has_simple_parameters_; }

+ // TODO(caitp): manage this state in a better way. PreParser must be able to

+ // communicate that the scope is non-simple, without allocating any parameters

+ // as the Parser does. This is necessary to ensure that TC39's proposed early

+ // error can be reported consistently regardless of whether lazily parsed or

+ // not.

+ void SetHasNonSimpleParameters() {

+ DCHECK(is_function_scope());

+ has_simple_parameters_ = false;

+ }

+ // The local variable 'arguments' if we need to allocate it; NULL otherwise.

+ Variable* arguments() const {

+ DCHECK(!is_arrow_scope() || arguments_ == nullptr);

+ return arguments_;

+ }

+ Variable* this_function_var() const {

+ // This is only used in derived constructors atm.

+ DCHECK(this_function_ == nullptr ||

+ (is_function_scope() && (IsClassConstructor(function_kind()) ||

+ IsConciseMethod(function_kind()) ||

+ IsAccessorFunction(function_kind()))));

+ return this_function_;

+ }

+ // Remove a temporary variable. This is for adjusting the scope of

+ // temporaries used when desugaring parameter initializers.

+ // Returns the index at which it was found in this scope, or -1 if

+ // it was not found.

+ int RemoveTemporary(Variable* var);

+ // Adds a temporary variable in this scope's TemporaryScope. This is for

+ // adjusting the scope of temporaries used when desugaring parameter

+ // initializers.

+ void AddTemporary(Variable* var) {

+ // Temporaries are only placed in ClosureScopes.

+ DCHECK_EQ(GetClosureScope(), this);

+ temps_.Add(var, zone());

+ }

+ ZoneList<Variable*>* temps() { return &temps_; }

+ SloppyBlockFunctionMap* sloppy_block_function_map() {

+ return &sloppy_block_function_map_;

+ }

+#ifdef DEBUG

+ void PrintParameters();

+#endif

+ void AllocateLocals(AstValueFactory* ast_value_factory);

+ void AllocateParameterLocals();

+ void AllocateReceiver();

+ private:

+ void AllocateParameter(Variable* var, int index);

+ void SetDefaults();

+ // If the scope is a function scope, this is the function kind.

+ const FunctionKind function_kind_;

+ // Info about the parameter list of a function.

+ int arity_;

+ int rest_index_;

+ Variable* rest_parameter_;

+ // Compiler-allocated (user-invisible) temporaries. Due to the implementation

+ // of RemoveTemporary(), may contain nulls, which must be skipped-over during

+ // allocation and printing.

+ ZoneList<Variable*> temps_;

+ // Parameter list in source order.

+ ZoneList<Variable*> params_;

+ // Map of function names to lists of functions defined in sloppy blocks

+ SloppyBlockFunctionMap sloppy_block_function_map_;

+ // Convenience variable.

+ Variable* receiver_;

+ // Function variable, if any; function scopes only.

+ VariableDeclaration* function_;

+ // new.target variable, function scopes only.

+ Variable* new_target_;

+ // Convenience variable; function scopes only.

+ Variable* arguments_;

+ // Convenience variable; Subclass constructor only

+ Variable* this_function_;

+ // Module descriptor; module scopes only.

+ ModuleDescriptor* module_descriptor_;

};

} // namespace internal

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