diff --git a/standard/attributes.md b/standard/attributes.md index 730fb4ab3..ad3ed32cc 100644 --- a/standard/attributes.md +++ b/standard/attributes.md @@ -156,7 +156,7 @@ The types of positional and named parameters for an attribute class are limited ## 23.3 Attribute specification -Application of a previously defined attribute to a program entity is called ***attribute specification***. An attribute is a piece of additional declarative information that is specified for a program entity. Attributes can be specified at global scope (to specify attributes on the containing assembly or module) and for *type_declaration*s ([§14.7](namespaces.md#147-type-declarations)), *class_member_declaration*s ([§15.3](classes.md#153-class-members)), *interface_member_declaration*s ([§19.4](interfaces.md#194-interface-members)), *struct_member_declaration*s ([§16.3](structs.md#163-struct-members)), *enum_member_declaration*s ([§20.2](enums.md#202-enum-declarations)), *accessor_declaration*s ([§15.7.3](classes.md#1573-accessors)), *event_accessor_declaration*s ([§15.8](classes.md#158-events)), elements of *parameter_list*s ([§15.6.2](classes.md#1562-method-parameters)), and elements of *type_parameter_list*s ([§15.2.3](classes.md#1523-type-parameters)). +Application of a previously defined attribute to a program entity is called ***attribute specification***. An attribute is a piece of additional declarative information that is specified for a program entity. Attributes can be specified at global scope (to specify attributes on the containing assembly or module) and for *type_declaration*s ([§14.7](namespaces.md#147-type-declarations)), *class_member_declaration*s ([§15.3](classes.md#153-class-members)), *interface_member_declaration*s ([§19.4](interfaces.md#194-interface-members)), *struct_member_declaration*s ([§16.3](structs.md#163-struct-members)), *enum_member_declaration*s ([§20.2](enums.md#202-enum-declarations)), *accessor_declaration*s ([§15.7.3](classes.md#1573-accessors)), *event_accessor_declaration*s ([§15.8](classes.md#158-events)), *local_function_declaration*s ([§13.6.4](statements.md#1364-local-function-declarations)), elements of *parameter_list*s ([§15.6.2](classes.md#1562-method-parameters)), and elements of *type_parameter_list*s ([§15.2.3](classes.md#1523-type-parameters)). Attributes are specified in ***attribute section***s. An attribute section consists of a pair of square brackets, which surround a comma-separated list of one or more attributes. The order in which attributes are specified in such a list, and the order in which sections attached to the same program entity are arranged, is not significant. For instance, the attribute specifications `[A][B]`, `[B][A]`, `[A, B]`, and `[B, A]` are equivalent. @@ -252,10 +252,10 @@ The standardized *attribute_target* names are `event`, `field`, `method`, `param - `event` — an event. - `field` — a field. A field-like event (i.e., one without accessors) ([§15.8.2](classes.md#1582-field-like-events)) and an automatically implemented property ([§15.7.4](classes.md#1574-automatically-implemented-properties)) can also have an attribute with this target. -- `method` — a constructor, finalizer, method, operator, property get and set accessors, indexer get and set accessors, and event add and remove accessors. A field-like event (i.e., one without accessors) can also have an attribute with this target. -- `param` — a property set accessor, an indexer set accessor, event add and remove accessors, and a parameter in a constructor, method, and operator. +- `method` — a constructor, finalizer, method, local function, operator, property get and set accessors, indexer get and set accessors, and event add and remove accessors. A field-like event (i.e., one without accessors) can also have an attribute with this target. +- `param` — a property set accessor, an indexer set accessor, event add and remove accessors, and a parameter in a constructor, method, local function, and operator. - `property` — a property and an indexer. -- `return` — a delegate, method, operator, property get accessor, and indexer get accessor. +- `return` — a delegate, method, local function, operator, property get accessor, and indexer get accessor. - `type` — a delegate, class, struct, enum, and interface. - `typevar` — a type parameter. @@ -267,6 +267,9 @@ Certain contexts permit the specification of an attribute on more than one targe - For an attribute on a method declaration the default target is the method. Otherwise when the *attribute_target* is equal to: - `method` — the target is the method - `return` — the target is the return value +- For an attribute on a local function declaration the default target is the local function. Otherwise when the *attribute_target* is equal to: + - `method` — the target is the local function + - `return` — the target is the return value - For an attribute on an operator declaration the default target is the operator. Otherwise when the *attribute_target* is equal to: - `method` — the target is the operator - `return` — the target is the return value @@ -513,7 +516,7 @@ A class that is decorated with the `AttributeUsage` attribute shall derive from #### 23.5.3.1 General -The attribute `Conditional` enables the definition of ***conditional method***s and ***conditional attribute class***es. +The attribute `Conditional` enables the definition of ***conditional method***s, ***conditional local function***s, and ***conditional attribute class***es. #### 23.5.3.2 Conditional methods @@ -667,6 +670,12 @@ The use of conditional methods in an inheritance chain can be confusing. Calls m > > *end example* +#### §conditional-local-function Conditional local functions + +A static local function may be made conditional in the same sense as a conditional method ([§23.5.3.2](attributes.md#23532-conditional-methods)). + +A compile time error occurs if a non-static local function is made conditional. + #### 23.5.3.3 Conditional attribute classes An attribute class ([§23.2](attributes.md#232-attribute-classes)) decorated with one or more `Conditional` attributes is a conditional attribute class. A conditional attribute class is thus associated with the conditional compilation symbols declared in its `Conditional` attributes. @@ -836,6 +845,44 @@ For invocations that occur within field or event initializers, the member name u For invocations that occur within declarations of instance constructors, static constructors, finalizers and operators the member name used is implementation-dependent. +For an invocation that occurs within a local function or an anonymous function, the name of the member method that calls that function is used. + +> *Example*: Consider the following: +> +> +> ```csharp +> class Program +> { +> static void Main() +> { +> F1(); +> Action anonymousFunction = () => F2(); +> anonymousFunction(); +> +> void F1([CallerMemberName] string? name = null) +> { +> Console.WriteLine($"F1 MemberName: |{name}|"); +> F2(); +> } +> +> static void F2([CallerMemberName] string? name = null) +> { +> Console.WriteLine($"F2 MemberName: |{name}|"); +> } +> } +> } +> ``` +> +> which produces the output +> +> ```console +> F1 MemberName: |Main| +> F2 MemberName: |Main| +> F2 MemberName: |Main| +> ``` +> +> This attribute supplies the name of the calling function member, which for local function `F1` is the method `Main`. And even though `F2` is called by `F1`, a local function is *not* a function member, so the reported caller of that invocation of `F2` is also `Main`. Similarly, when `F2` is called by the anonymous function assigned to `anonymousFunction`, the reported caller is the method `Main`, which calls that anonymous function. *end example* + ### 23.5.7 Code analysis attributes #### 23.5.7.1 General diff --git a/standard/statements.md b/standard/statements.md index 4ef8a18e3..bd0fbd311 100644 --- a/standard/statements.md +++ b/standard/statements.md @@ -486,9 +486,9 @@ A *local_function_declaration* declares a local function. ```ANTLR local_function_declaration - : local_function_modifier* return_type local_function_header + : attributes? local_function_modifier* return_type local_function_header local_function_body - | ref_local_function_modifier* ref_kind ref_return_type + | attributes? ref_local_function_modifier* ref_kind ref_return_type local_function_header ref_local_function_body ; @@ -505,6 +505,7 @@ local_function_modifier ref_local_function_modifier : 'static' + | 'extern' | unsafe_modifier // unsafe code support ; @@ -512,11 +513,13 @@ local_function_body : block | '=>' null_conditional_invocation_expression ';' | '=>' expression ';' + | ';' ; ref_local_function_body : block | '=>' 'ref' variable_reference ';' + | ';' ; ``` @@ -561,7 +564,11 @@ Unless specified otherwise below, the semantics of all grammar elements is the s The *identifier* of a *local_function_declaration* shall be unique in its declared block scope, including any enclosing local variable declaration spaces. One consequence of this is that overloaded *local_function_declaration*s are not allowed. -A *local_function_declaration* may include one `async` ([§15.14](classes.md#1514-async-functions)) modifier and one `unsafe` ([§24.1](unsafe-code.md#241-general)) modifier. If the declaration includes the `async` modifier then the return type shall be `void` or a `«TaskType»` type ([§15.14.1](classes.md#15141-general)). If the declaration includes the `static` modifier, the function is a ***static local function***; otherwise, it is a ***non-static local function***. It is a compile-time error for *type_parameter_list* or *parameter_list* to contain *attributes*. If the local function is declared in an unsafe context ([§24.2](unsafe-code.md#242-unsafe-contexts)), the local function may include unsafe code, even if the local function declaration does not include the `unsafe` modifier. +A *local_function_declaration* may include one `async` ([§15.14](classes.md#1514-async-functions)) modifier and one `unsafe` ([§24.1](unsafe-code.md#241-general)) modifier. If the declaration includes the `async` modifier then the return type shall be `void` or a `«TaskType»` type ([§15.14.1](classes.md#15141-general)). If the declaration includes the `static` modifier, the function is a ***static local function***; otherwise, it is a ***non-static local function***. If the local function is declared in an unsafe context ([§24.2](unsafe-code.md#242-unsafe-contexts)), the local function may include unsafe code, even if the local function declaration doesn’t include the `unsafe` modifier. + +An external local function shall have the modifier `static`, and its *local_function_body* or *ref_local_function_body* shall be a semicolon. + +A *local_function_body* or *ref_local_function_body* shall be a semicolon only for an external local function. A local function is declared at block scope. A non-static local function may capture variables from the enclosing scope while a static local function shall not (so it has no access to enclosing locals, parameters, non-static local functions, or `this`). It is a compile-time error if a captured variable is read by the body of a non-static local function but is not definitely assigned before each call to the function. A compiler shall determine which variables are definitely assigned on return ([§9.4.4.33](variables.md#94433-rules-for-variables-in-local-functions)). diff --git a/standard/variables.md b/standard/variables.md index afefc2726..68ff994e9 100644 --- a/standard/variables.md +++ b/standard/variables.md @@ -681,7 +681,7 @@ For an expression *expr*, which has subexpressions *expr₁*, *expr₂*, …, *e #### 9.4.4.24 Invocation expressions and object creation expressions -If the method to be invoked is a partial method that has no implementing partial method declaration, or is a conditional method for which the call is omitted ([§23.5.3.2](attributes.md#23532-conditional-methods)), then the definite-assignment state of *v* after the invocation is the same as the definite-assignment state of *v* before the invocation. Otherwise the following rules apply: +If the method to be invoked is a partial method that has no implementing partial method declaration, or is a conditional method or conditional local function for which the call is omitted ([§23.5.3.2](attributes.md#23532-conditional-methods), §conditional-local-function), then the definite-assignment state of *v* after the invocation is the same as the definite-assignment state of *v* before the invocation. Otherwise the following rules apply: For an invocation expression *expr* of the form: diff --git a/tools/GrammarTesting/Tests/Parsing/Samples/v9/Attributes on Local Functions/ReadMe.md b/tools/GrammarTesting/Tests/Parsing/Samples/v9/Attributes on Local Functions/ReadMe.md new file mode 100644 index 000000000..9e85aeeb4 --- /dev/null +++ b/tools/GrammarTesting/Tests/Parsing/Samples/v9/Attributes on Local Functions/ReadMe.md @@ -0,0 +1,3 @@ +# Sample: Attributes on Local Functions + +This is taken from §23.5.6.4 The CallerMemberName attribute diff --git a/tools/GrammarTesting/Tests/Parsing/Samples/v9/Attributes on Local Functions/Reference/sample.gruntree.red.txt b/tools/GrammarTesting/Tests/Parsing/Samples/v9/Attributes on Local Functions/Reference/sample.gruntree.red.txt new file mode 100644 index 000000000..e69de29bb diff --git a/tools/GrammarTesting/Tests/Parsing/Samples/v9/Attributes on Local Functions/Reference/sample.stderr.txt b/tools/GrammarTesting/Tests/Parsing/Samples/v9/Attributes on Local Functions/Reference/sample.stderr.txt new file mode 100644 index 000000000..e69de29bb diff --git a/tools/GrammarTesting/Tests/Parsing/Samples/v9/Attributes on Local Functions/Reference/sample.tokens.txt b/tools/GrammarTesting/Tests/Parsing/Samples/v9/Attributes on Local Functions/Reference/sample.tokens.txt new file mode 100644 index 000000000..1221ecd6d --- /dev/null +++ b/tools/GrammarTesting/Tests/Parsing/Samples/v9/Attributes on Local Functions/Reference/sample.tokens.txt @@ -0,0 +1,78 @@ +[@0,0:4='using',<'using'>,1:0] +[@1,6:11='System',,1:6] +[@2,12:12=';',<';'>,1:12] +[@3,15:19='class',<'class'>,3:0] +[@4,21:27='Program',,3:6] +[@5,29:29='{',<'{'>,4:0] +[@6,35:40='static',<'static'>,5:4] +[@7,42:45='void',<'void'>,5:11] +[@8,47:50='Main',,5:16] +[@9,51:51='(',<'('>,5:20] +[@10,52:52=')',<')'>,5:21] +[@11,58:58='{',<'{'>,6:4] +[@12,68:69='F1',,7:8] +[@13,70:70='(',<'('>,7:10] +[@14,71:71=')',<')'>,7:11] +[@15,72:72=';',<';'>,7:12] +[@16,83:86='void',<'void'>,9:8] +[@17,88:89='F1',,9:13] +[@18,90:90='(',<'('>,9:15] +[@19,91:91='[',<'['>,9:16] +[@20,92:107='CallerMemberName',,9:17] +[@21,108:108=']',<']'>,9:33] +[@22,110:115='string',<'string'>,9:35] +[@23,116:116='?',<'?'>,9:41] +[@24,118:121='name',,9:43] +[@25,123:123='=',<'='>,9:48] +[@26,125:128='null',<'null'>,9:50] +[@27,129:129=')',<')'>,9:54] +[@28,139:139='{',<'{'>,10:8] +[@29,153:159='Console',,11:12] +[@30,160:160='.',<'.'>,11:19] +[@31,161:169='WriteLine',,11:20] +[@32,170:170='(',<'('>,11:29] +[@33,171:172='〔$"〕',,11:30] +[@34,173:188='〔F1 MemberName: |〕',,11:32] +[@35,189:189='{',<'{'>,11:48] +[@36,190:193='name',,11:49] +[@37,194:194='}',<'}'>,11:53] +[@38,195:195='〔|〕',,11:54] +[@39,196:196='〔"〕',,11:55] +[@40,197:197=')',<')'>,11:56] +[@41,198:198=';',<';'>,11:57] +[@42,212:213='F2',,12:12] +[@43,214:214='(',<'('>,12:14] +[@44,215:215=')',<')'>,12:15] +[@45,216:216=';',<';'>,12:16] +[@46,226:226='}',<'}'>,13:8] +[@47,237:242='static',<'static'>,15:8] +[@48,244:247='void',<'void'>,15:15] +[@49,249:250='F2',,15:20] +[@50,251:251='(',<'('>,15:22] +[@51,252:252='[',<'['>,15:23] +[@52,253:268='CallerMemberName',,15:24] +[@53,269:269=']',<']'>,15:40] +[@54,271:276='string',<'string'>,15:42] +[@55,277:277='?',<'?'>,15:48] +[@56,279:282='name',,15:50] +[@57,284:284='=',<'='>,15:55] +[@58,286:289='null',<'null'>,15:57] +[@59,290:290=')',<')'>,15:61] +[@60,300:300='{',<'{'>,16:8] +[@61,314:320='Console',,17:12] +[@62,321:321='.',<'.'>,17:19] +[@63,322:330='WriteLine',,17:20] +[@64,331:331='(',<'('>,17:29] +[@65,332:333='〔$"〕',,17:30] +[@66,334:349='〔F2 MemberName: |〕',,17:32] +[@67,350:350='{',<'{'>,17:48] +[@68,351:354='name',,17:49] +[@69,355:355='}',<'}'>,17:53] +[@70,356:356='〔|〕',,17:54] +[@71,357:357='〔"〕',,17:55] +[@72,358:358=')',<')'>,17:56] +[@73,359:359=';',<';'>,17:57] +[@74,369:369='}',<'}'>,18:8] +[@75,375:375='}',<'}'>,19:4] +[@76,377:377='}',<'}'>,20:0] +[@77,378:377='',,20:1] diff --git a/tools/GrammarTesting/Tests/Parsing/Samples/v9/Attributes on Local Functions/Reference/sample.tree.red.txt b/tools/GrammarTesting/Tests/Parsing/Samples/v9/Attributes on Local Functions/Reference/sample.tree.red.txt new file mode 100644 index 000000000..f231680ba --- /dev/null +++ b/tools/GrammarTesting/Tests/Parsing/Samples/v9/Attributes on Local Functions/Reference/sample.tree.red.txt @@ -0,0 +1 @@ +(prog (compilation_unit (using_directive (using_namespace_directive using (namespace_name (identifier System)) ;)) (namespace_member_declaration (class_declaration class (identifier Program) (class_body { (class_member_declaration (method_declaration (method_modifiers (ref_method_modifier static)) (return_type void) (method_header (member_name (identifier Main)) ( )) (method_body (block { (statement_list (statement (expression_statement (statement_expression (invocation_expression (primary_expression (identifier F1)) ( ))) ;)) (statement (local_function_declaration (return_type void) (local_function_header (identifier F1) ( (parameter_list (fixed_parameter (attributes (attribute_section [ (attribute_list (identifier CallerMemberName)) ])) (type (nullable_reference_type (non_nullable_reference_type (class_type string)) (nullable_type_annotation ?))) (identifier name) (default_argument = (expression (null_literal null))))) )) (local_function_body (block { (statement_list (statement (expression_statement (statement_expression (invocation_expression (primary_expression (member_access (primary_expression (identifier Console)) . (identifier WriteLine))) ( (argument_list (interpolated_regular_string_expression 〔$"〕 〔F1 MemberName: |〕 { (regular_interpolation (identifier name)) } 〔|〕 〔"〕)) ))) ;)) (statement (expression_statement (statement_expression (invocation_expression (primary_expression (identifier F2)) ( ))) ;))) })))) (statement (local_function_declaration (local_function_modifier (ref_local_function_modifier static)) (return_type void) (local_function_header (identifier F2) ( (parameter_list (fixed_parameter (attributes (attribute_section [ (attribute_list (identifier CallerMemberName)) ])) (type (nullable_reference_type (non_nullable_reference_type (class_type string)) (nullable_type_annotation ?))) (identifier name) (default_argument = (expression (null_literal null))))) )) (local_function_body (block { (statement_list (expression_statement (statement_expression (invocation_expression (primary_expression (member_access (primary_expression (identifier Console)) . (identifier WriteLine))) ( (argument_list (interpolated_regular_string_expression 〔$"〕 〔F2 MemberName: |〕 { (regular_interpolation (identifier name)) } 〔|〕 〔"〕)) ))) ;)) }))))) })))) }))))) diff --git a/tools/GrammarTesting/Tests/Parsing/Samples/v9/Attributes on Local Functions/Reference/sample.tree.svg b/tools/GrammarTesting/Tests/Parsing/Samples/v9/Attributes on Local Functions/Reference/sample.tree.svg new file mode 100644 index 000000000..468c0202a --- /dev/null +++ b/tools/GrammarTesting/Tests/Parsing/Samples/v9/Attributes on Local Functions/Reference/sample.tree.svg @@ -0,0 +1,1625 @@ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +local_function_declaration + + + +conditional_expression + + + +conditional_expression + + + +[ + + + +name + + + +method_header + + + +nullable_reference_type + + + +statement_expression + + + +. + + + +conditional_or_expression + + + +relational_expression + + + +interpolated_regular_string_expression + + + +range_expression + + + +〔"〕 + + + +member_access + + + +invocation_expression + + + +identifier + + + +nullable_type_annotation + + + +declaration_statement + + + +expression + + + +attribute_section + + + +shift_expression + + + +〔F2·MemberName:·|〕 + + + +expression_statement + + + +( + + + +class_type + + + +attribute + + + +exclusive_or_expression + + + +null + + + +{ + + + +attribute_list + + + +switch_expression + + + +type + + + +type + + + +〔$"〕 + + + +ref_method_modifier + + + +statement_list + + + +reference_type + + + +null_coalescing_expression + + + +primary_expression + + + +member_access + + + +parameter_list + + + +default_argument + + + +identifier + + + +statement_list + + + +attribute + + + +unary_expression + + + +) + + + +method_modifiers + + + +class_body + + + +non_assignment_expression + + + +inclusive_or_expression + + + +multiplicative_expression + + + +identifier + + + +regular_interpolation + + + +class_declaration + + + +( + + + +exclusive_or_expression + + + +conditional_or_expression + + + +simple_name + + + +Console + + + +range_expression + + + +regular_interpolation + + + +} + + + +conditional_and_expression + + + +expression_statement + + + +primary_expression + + + +non_assignment_expression + + + +void + + + +literal + + + +exclusive_or_expression + + + +Program + + + +nullable_type_annotation + + + +attribute_list + + + +equality_expression + + + +null_literal + + + +reference_type + + + +fixed_parameters + + + +non_nullable_reference_type + + + +method_modifier + + + +embedded_statement + + + +attributes + + + +CallerMemberName + + + +static + + + +unary_expression + + + +System + + + +) + + + +method_body + + + +primary_expression + + + +〔F1·MemberName:·|〕 + + + +local_function_header + + + +CallerMemberName + + + +return_type + + + +expression_statement + + + +relational_expression + + + +primary_expression + + + +) + + + +〔"〕 + + + +) + + + +name + + + +unary_expression + + + +inclusive_or_expression + + + +identifier + + + +primary_expression + + + +identifier + + + +unary_expression + + + +namespace_or_type_name + + + +shift_expression + + + +shift_expression + + + +statement + + + +null_coalescing_expression + + + +additive_expression + + + +declaration_statement + + + +) + + + +. + + + +additive_expression + + + +simple_name + + + +expression + + + +conditional_expression + + + +expression + + + +additive_expression + + + +return_type + + + +equality_expression + + + +conditional_and_expression + + + +; 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+ +class Program +{ + static void Main() + { + F1(); + + void F1([CallerMemberName] string? name = null) + { + Console.WriteLine($"F1 MemberName: |{name}|"); + F2(); + } + + static void F2([CallerMemberName] string? name = null) + { + Console.WriteLine($"F2 MemberName: |{name}|"); + } + } +} \ No newline at end of file