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Ed_ 6b10cd2b3e Updated AST_Types.md doc

2023-11-22 15:03:24 -05:00

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AST Types Documentation

While the Readme for docs covers the data layout per AST, this will focus on the AST types avaialble, and their nuances.

Body

These are containers representing a scope body of a definition that can be of the following ECode type:

Class_Body
Enum_Body
Export_Body
Extern_Linkage_Body
Function_Body
Global_Body
Namespace_Body
Struct_Body
Union_Body

Fields:

Code           Front;
Code           Back;
parser::Token* Tok;
Code           Parent;
StringCached   Name;
CodeT          Type;
s32            NumEntries;

The Front member represents the start of the link list and Back the end. NumEntries is the number of entries in the body.

Parent should have a compatible ECode type for the type of defintion used.

Serialization:

Will output only the entries, the braces are handled by the parent.

<Front>...
<Back>

Attributes

Represent standard or vendor specific C/C++ attributes.

Fields:

StringCached   Content;
Code           Prev;
Code           Next;
parser::Token* Tok;
Code           Parent;
StringCached   Name;
CodeT          Type;

Serialization:

<Content>

While the parser supports the __declspec and __attribute__ syntax, the upfront constructor ( def_attributes ) must have the user specify the entire attribute, including the [[]], __declspec or __attribute__ parts.

Comment

Stores a comment.

Fields:

StringCached   Content;
Code           Prev;
Code           Next;
parser::Token* Tok;
Code           Parent;
StringCached   Name;
CodeT          Type;

Serialization:

<Content>

The parser will perserve comments found if residing with a body or in accepted inline-to-definition locations. Otherwise they will be skipped by the TokArray::__eat and TokArray::current( skip foramtting enabled ) functions.

The upfront constructor: def_comment expects to recieve a comment without the // or /* */ parts. It will add them during construction.

Class & Struct

Fields:

CodeComment    InlineCmt;  // Only supported by forward declarations
CodeAttributes Attributes;
CodeType       ParentType;
CodeBody       Body;
CodeType       Prev;       // Used to store references to interfaces
CodeType       Next;       // Used to store references to interfaces
parser::Token* Tok;
Code           Parent;
StringCached   Name;
CodeT          Type;
ModuleFlag     ModuleFlags;
AccessSpec     ParentAccess;

Serialization:

// Class_Fwd
<ModuleFlags> <class/struct> <Name>; <InlineCmt>

// Class
<ModuleFlags> <class/struct> <Attributes> <Name> : <ParentAccess> <ParentType>, public <ParentType->Next>, ... <InlineCmt>
{
    <Body>
};

You'll notice that only one parent type is supported only with parent access. This library only supports single inheritance, the rest must be done through interfaces.

Constructor

Fields:

CodeComment    InlineCmt;  // Only supported by forward declarations
Code           InitializerList;
CodeParam      Params;
Code           Body;
Code           Prev;
Code           Next;
parser::Token* Tok;
Code           Parent;
CodeT          Type;

Serialization:

// Constructor_Fwd
<Specs> <Parent->Name>( <Params> ); <InlineCmt>

// Constructor
<Specs> <Parent->Name>( <Params> ) <InlineCmt>
    : <InitializerList>
{
    <Body>
}

Define

Represents a preprocessor define

Fields:

StringCached   Content;
Code           Prev;
Code           Next;
parser::Token* Tok;
Code           Parent;
StringCached   Name;
CodeT          Type;

Serialization:

#define <Name> <Content>

Destructor

Fields:

CodeComment    InlineCmt;
CodeSpecifiers Specs;
Code           Body;
Code           Prev;
Code           Next;
parser::Token* Tok;
Code           Parent;
CodeT          Type;

Serialization:

// Destructor_Fwd
<Specs> ~<Parent->Name>( <Params> ) <Specs>; <InlineCmt>

// Destructor
<Specs> ~<Parent->Name>( <Params> ) <Specs>
{
    <Body>
}

Enum

Fields:

CodeComment    InlineCmt;
CodeAttributes Attributes;
CodeType       UnderlyingType;
CodeBody       Body;
Code           Prev;
Code           Next;
parser::Token* Tok;
Code           Parent;
StringCached   Name;
CodeT          Type;
ModuleFlag     ModuleFlags;

Serialization:

// Enum_Fwd
<ModuleFlags> enum class <Name> : <UnderlyingType>; <InlineCmt>

// Enum
<ModuleFlags> <enum or enum class> <Name> : <UnderlyingType>
{
    <Body>
};

Execution

Just represents an execution body. Equivalent to an untyped body. Will be obsolute when function body parsing is implemented.

Fields:

StringCached   Content;
Code           Prev;
Code           Next;
parser::Token* Tok;
Code           Parent;
StringCached   Name;
CodeT          Type;

Serialization:

<Content>

External Linkage

Fields:

CodeBody       Body;
Code           Prev;
Code           Next;
parser::Token* Tok;
Code           Parent;
StringCached   Name;
CodeT          Type;

Serialization:

extern "<Name>"
{
    <Body>
}

Include

Fields:

StringCached   Content;
Code           Prev;
Code           Next;
Code           Parent;
parser::Token* Tok;
StringCached   Name;
CodeT          Type;

Serialization:

#include <Content>

Friend

This library (until its necessary become some third-party library to do otherwise) does not support friend declarations with in-statment function definitions.

Fields:

CodeComment    InlineCmt;
Code           Declaration;
Code           Prev;
Code           Next;
parser::Token* Tok;
Code           Parent;
StringCached   Name;
CodeT          Type;

Serialization:

friend <Declaration>; <InlineCmt>

Function

Fields:

CodeComment    InlineCmt;
CodeAttributes Attributes;
CodeSpecifiers Specs;
CodeType       ReturnType;
CodeParam      Params;
CodeBody       Body;
Code           Prev;
Code           Next;
parser::Token* Tok;
Code           Parent;
StringCached   Name;
CodeT          Type;
ModuleFlag     ModuleFlags;

Serialization:

// Function_Fwd
<ModuleFlags> <Attributes> <Specs> <ReturnType> <Name>( <Params> ) <Specs>; <InlineCmt>

// Function
<ModuleFlags> <Attributes> <Specs> <ReturnType> <Name>( <Params> ) <Specs>
{
    <Body>
}

Module

Fields:

Code           Prev;
Code           Next;
parser::Token* Tok;
Code           Parent;
StringCached   Name;
CodeT          Type;
ModuleFlag     ModuleFlags;

Serialization:

<ModuleFlags> module <Name>;

Namespace

Fields:

CodeBody       Body;
Code           Prev;
Code           Next;
parser::Token* Tok;
Code           Parent;
StringCached   Name;
CodeT          Type;
ModuleFlag     ModuleFlags;

Serialization:

<ModuleFlags> namespace <Name>
{
    <Body>
}

Operator Overload

Fields:

CodeComment    InlineCmt;
CodeAttributes Attributes;
CodeSpecifiers Specs;
CodeType       ReturnType;
CodeParam      Params;
CodeBody       Body;
Code           Prev;
Code           Next;
parser::Token* Tok;
Code           Parent;
StringCached   Name;
CodeT          Type;
ModuleFlag     ModuleFlags;
OperatorT      Op;

Serialization:

// Operator_Fwd
<ModuleFlags> <Attributes> <Specs> <ReturnType> operator <Op>( <Params> ) <Specs>; <InlineCmt>

// Operator
<ModuleFlags> <Attributes> <Specs> <ReturnType> <Name>operator <Op>( <Params> ) <Specs>
{
    <Body>
}

Operator Cast Overload ( User-Defined Type Conversion )

Fields:

CodeComment    InlineCmt;
CodeSpecifiers Specs;
CodeType       ValueType;
CodeBody       Body;
Code           Prev;
Code           Next;
parser::Token* Tok;
Code           Parent;
StringCached   Name;
CodeT          Type;

Serialization:

// Operator_Cast_Fwd
<Specs> operator <ValueType>() <Specs>; <InlineCmt>

// Operator_Cast
<Specs> <Name>operator <ValueType>() <Specs>
{
    <Body>
}

Parameters

Fields:

CodeType       ValueType;
Code           Value;
CodeParam      Last;
CodeParam      Next;
parser::Token* Tok;
Code           Parent;
StringCached   Name;
CodeT          Type;
s32            NumEntries;

Serialization:

<ValueType> <Name>, <Next>... <Last>

Pragma

Fields:

StringCached   Content;
Code           Prev;
Code           Next;
parser::Token* Tok;
Code           Parent;
StringCached   Name;
CodeT          Type;

Serialization:

#pragma <Content>

Preprocessor Conditional

Fields:

StringCached  Content;
Code          Prev;
Code          Next;
paser::Token* Tok;
Code          Parent;
StringCached  Name;
CodeT         Type;

Serialization:

#<based off Type> <Content>

Specifiers

Fields:

SpecifierT     ArrSpecs[ AST::ArrSpecs_Cap ];
CodeSpecifiers NextSpecs;
Code           Prev;
Code           Next;
parser::Token* Tok;
Code           Parent;
StringCached   Name;
CodeT          Type;
s32            NumEntries;

Serialization:

<Spec>, ...

Template

Fields:

CodeParam      Params;
Code           Declaration;
Code           Prev;
Code           Next;
parser::Token* Tok;
Code           Parent;
StringCached   Name;
CodeT          Type;
ModuleFlag     ModuleFlags;

Serialization:

<ModuleFlags>
template< <Params> >
<Declaration>

Typename

Typenames represent the type "symbol".

Fields:

CodeAttributes Attributes;
CodeSpecifiers Specs;
CodeReturnType ReturnType;
CodeParam      Params;
Code           ArrExpr;
Code           Prev;
Code           Next;
parser::Token* Tok;
Code           Parent;
StringCached   Name;
CodeT          Type;
b32            IsParamPack;

Serialization:

<Attributes> <Name> <Specs> <IsParamPack ?: ...>

Typedef

Behave as usual except function or macro typedefs.
Those (macros) don't use the underlying type field as everything was serialized under the Name field.

Fields:

CodeComment   InlineCmt;
Code          UnderlyingType;
Code          Prev;
Code          Next;
parse::Token* Tok
Code          Parent;
StringCached  Name;
CodeT         Type;
ModuleFlag    ModuleFlags;
b32           IsFunction;

Serialization:

// Regular
<ModuleFlags> typedef <UnderlyingType> <Name>; <InlineCmt>

// Functions
<ModuleFlags> typedef <ReturnType> <Name>( <Parameters> ); <InlineCmt>
<ModuleFlags> typedef <ReturnType> ( <Expression that yeilds an Identifier signature> )( <Parameters> ); <InlineCmt>

Union

Fields:

CodeAttributes Attributes;
CodeBody       Body;
Code           Prev;
Code           Next;
parser::Token* Tok;
Code           Parent;
StringCached   Name;
CodeT          Type;
ModuleFlag     ModuleFlags;

Serialization:

<ModuleFlags> union <Attributes> <Name>
{
    <Body>
}

Using

Fields:

CodeComment    InlineCmt;
CodeAttributes Attributes;
CodeType       UnderlyingType;
Code           Prev;
Code           Next;
parser::Token* Tok;
Code           Parent;
StringCached   Name;
CodeT          Type;
ModuleFlag     ModuleFlags;

Serialization:

// Regular
<ModuleFlags> using <Attributes> <Name> = <UnderlyingType>; <InlineCmt>

// Namespace
<ModuleFlags> using namespace <Name>; <InlineCmt>

Variable

Algo

Fields:

CodeComment    InlineCmt;
CodeAttributes Attributes;
CodeSpecifiers Specs;
CodeType       ValueType;
Code           BitfieldSize;
Code           Value;
CodeVar        NextVar;
Code           Prev;
Code           Next;
parser::Token* Tok;
Code           Parent;
StringCached   Name;
CodeT          Type;
ModuleFlag     ModuleFlags;

Serialization:

// Regular
<ModuleFlags> <Attributes> <Specs> <ValueType> <Name> = <Value>, NextVar ...; <InlineCmt>

// Bitfield
<ModuleFlags> <Attributes> <Specs> <ValueType> <Name> : <BitfieldSize> = <Value>, NextVar ...; <InlineCmt>

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AST Types Documentation

Body

Attributes

Comment

Class & Struct

Constructor

Define

Destructor

Enum

Execution

External Linkage

Include

Friend

Function

Module

Namespace

Operator Overload

Operator Cast Overload ( User-Defined Type Conversion )

Parameters

Pragma

Preprocessor Conditional

Specifiers

Template

Typename

Typedef

Union

Using

Variable

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