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More progress on parsing

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Made it to line 2597 of self parsing its singleheader

Complex global or member defintions are now supported.
This commit is contained in:
Edward R. Gonzalez 2023-08-01 05:17:24 -04:00
parent 21a8f3bb39
commit 528ef72a51
7 changed files with 252 additions and 145 deletions
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2
Readme.md
View File

@ -17,7 +17,7 @@ A `natvis` and `natstepfilter` are provided in the scripts directory.
***The editor and scanner have not been implemented yet. The scanner will come first, then the editor.***
A C variant is hosted [here](https://github.com/Ed94/genc); I haven't gotten headwind on it, should be easier to make than this...
A C variant is hosted [here](https://github.com/Ed94/genc); I will complete it when this library is feature complete, it should be easier to make than this...
## Usage

43
docs/Parsing.md
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@ -3,26 +3,6 @@
The library features a naive parser tailored for only what the library needs to construct the supported syntax of C++ into its AST.
This parser does not, and should not do the compiler's job. By only supporting this minimal set of features, the parser is kept under 5000 loc.
Everything is done in one pass for both the preprocessor directives and the rest of the language.
The parser performs no macro expansion as the scope of gencpp feature-set is to only support the preprocessor for the goal of having rudimentary awareness of preprocessor ***conditionals***, ***defines***, and ***includes***, and ***`pragmas`**.
The keywords supported for the preprocessor are:
* include
* define
* if
* ifdef
* elif
* endif
* undef
* pragma
Each directive `#` line is considered one preproecessor unit, and will be treated as one Preprocessor AST. *These ASTs will be considered members or entries of braced scope they reside within*.
All keywords except *include* are suppported as members of a scope for a class/struct, global, or namespace body.
Any preprocessor definition abuse that changes the syntax of the core language is unsupported and will fail to parse if not kept within an execution scope (function body, or expression assignment).
The parsing implementation supports the following for the user:
```cpp
@ -47,3 +27,26 @@ CodeVar parse_variable ( StrC var_def );
***Parsing will aggregate any tokens within a function body or expression statement to an untyped Code AST.***
Everything is done in one pass for both the preprocessor directives and the rest of the language.
The parser performs no macro expansion as the scope of gencpp feature-set is to only support the preprocessor for the goal of having rudimentary awareness of preprocessor ***conditionals***, ***defines***, and ***includes***, and ***`pragmas`**.
The keywords supported for the preprocessor are:
* include
* define
* if
* ifdef
* elif
* endif
* undef
* pragma
Each directive `#` line is considered one preproecessor unit, and will be treated as one Preprocessor AST. *These ASTs will be considered members or entries of braced scope they reside within*.
All keywords except *include* are suppported as members of a scope for a class/struct, global, or namespace body.
Any preprocessor definition abuse that changes the syntax of the core language is unsupported and will fail to parse if not kept within an execution scope (function body, or expression assignment).
Exceptions to the above rule (If its too hard to keep track of just follow the above notion):
* Typedefs allow of a macro exansion to be defined after the keyword; Ex: `typedef GEN_FILE_OPEN_PROC( file_open_proc );`

2
project/Readme.md
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@ -12,7 +12,7 @@ Just like the `gen.<hpp/cpp>` they include their components: `dependencies/<depe
The fle processors are in their own respective files. (Ex: `file_processors/<file_processor>.<hpp/cpp>` )
They directly include `depedencies/file_handling.<hpp/cpp>` as the core library does not include file processing by defualt.
**TODO : Right now the library is not finished structurally, as such the first self-hosting iteration is still WIP**
**TODO : Right now the library is not finished, as such the first self-hosting iteration is still WIP**
Both libraries use *pre-generated* (self-hosting I guess) version of the library to then generate the latest version of itself.
(sort of a verification that the generated version is equivalent).

12
project/components/ast.cpp
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@ -707,7 +707,9 @@ String AST::to_string()
);
}
if ( Parent && Parent->Type != ECode::Typedef )
bool add_semicolon = Parent && Parent->Type != ECode::Typedef && Parent->Type != ECode::Variable;
if ( add_semicolon )
result.append(";");
}
break;
@ -756,6 +758,9 @@ String AST::to_string()
if ( ValueType->ArrExpr )
result.append_fmt( "[%s]", ValueType->ArrExpr->to_string() );
if ( BitfieldSize )
result.append_fmt( " : %lu", BitfieldSize );
if ( Value )
result.append_fmt( " = %s", Value->to_string() );
@ -764,7 +769,10 @@ String AST::to_string()
break;
}
if ( UnderlyingType->ArrExpr )
if ( BitfieldSize )
result.append_fmt( "%s : %lu", ValueType->to_string(), BitfieldSize );
else if ( UnderlyingType->ArrExpr )
result.append_fmt( "%s %s[%s];", UnderlyingType->to_string(), Name, UnderlyingType->ArrExpr->to_string() );
else

12
project/components/data_structures.hpp
View File

@ -231,7 +231,10 @@ struct AST
AST* UnderlyingType; // Enum, Typedef
AST* ValueType; // Parameter, Variable
};
AST* Params; // Function, Operator, Template
union {
AST* Params; // Function, Operator, Template
AST* BitfieldSize; // Varaiable (Class/Struct Data Member)
};
union {
AST* ArrExpr; // Type Symbol
AST* Body; // Class, Enum, Function, Namespace, Struct, Union
@ -275,7 +278,10 @@ struct AST_POD
AST* UnderlyingType; // Enum, Typedef
AST* ValueType; // Parameter, Variable
};
AST* Params; // Function, Operator, Template
union {
AST* Params; // Function, Operator, Template
AST* BitfieldSize; // Varaiable (Class/Struct Data Member)
};
union {
AST* ArrExpr; // Type Symbol
AST* Body; // Class, Enum, Function, Namespace, Struct, Union
@ -1064,7 +1070,7 @@ struct AST_Var
CodeAttributes Attributes;
CodeSpecifiers Specs;
CodeType ValueType;
char _PAD_PROPERTIES_[ sizeof(AST*) ];
Code BitfieldSize;
Code Value;
};
};

323
project/components/interface.parsing.cpp
View File

@ -81,6 +81,11 @@ namespace Parser
{
return Idx + 1 < Arr.num() ? &Arr[Idx + 1] : nullptr;
}
Token& operator []( s32 idx )
{
return Arr[idx];
}
};
struct StackNode
@ -1015,8 +1020,8 @@ if ( def.Ptr == nullptr ) \
internal Code parse_function_body();
internal Code parse_global_nspace();
internal CodeClass parse_class ( bool from_typedef = false );
internal CodeEnum parse_enum ( bool from_typedef = false );
internal CodeClass parse_class ( bool inplace_def = false );
internal CodeEnum parse_enum ( bool inplace_def = false );
internal CodeBody parse_export_body ();
internal CodeBody parse_extern_link_body();
internal CodeExtern parse_exten_link ();
@ -1024,14 +1029,16 @@ internal CodeFriend parse_friend ();
internal CodeFn parse_function ();
internal CodeNamespace parse_namespace ();
internal CodeOpCast parse_operator_cast ();
internal CodeStruct parse_struct ( bool from_typedef = false );
internal CodeStruct parse_struct ( bool inplace_def = false );
internal CodeVar parse_variable ();
internal CodeTemplate parse_template ();
internal CodeType parse_type ();
internal CodeTypedef parse_typedef ();
internal CodeUnion parse_union ( bool from_typedef = false );
internal CodeUnion parse_union ( bool inplace_def = false );
internal CodeUsing parse_using ();
constexpr bool inplace_def = true;
internal inline
CodeDefine parse_define()
{
@ -1925,6 +1932,8 @@ CodeVar parse_variable_after_name(
Code array_expr = parse_array_decl();
Code expr = { nullptr };
Code bitfield_expr = { nullptr };
if ( currtok.IsAssign )
{
eat( TokType::Operator );
@ -1947,6 +1956,28 @@ CodeVar parse_variable_after_name(
expr = untyped_str( expr_tok );
}
if ( currtok.Type == TokType::Assign_Classifer )
{
eat( TokType::Assign_Classifer );
Token expr_tok = currtok;
if ( currtok.Type == TokType::Statement_End )
{
log_failure( "Expected expression after bitfield \n%s", Context.to_string() );
Context.pop();
return CodeInvalid;
}
while ( left && currtok.Type != TokType::Statement_End )
{
eat( currtok.Type );
}
expr_tok.Length = ( (sptr)currtok.Text + currtok.Length ) - (sptr)expr_tok.Text;
bitfield_expr = untyped_str( expr_tok );
}
eat( TokType::Statement_End );
using namespace ECode;
@ -1962,6 +1993,9 @@ CodeVar parse_variable_after_name(
if (array_expr )
type->ArrExpr = array_expr;
if ( bitfield_expr )
result->BitfieldSize = bitfield_expr;
if ( attributes )
result->Attributes = attributes;
@ -2009,6 +2043,7 @@ Code parse_variable_assignment()
return expr;
}
internal inline
Code parse_operator_function_or_variable( bool expects_function, CodeAttributes attributes, CodeSpecifiers specifiers )
{
@ -2059,6 +2094,133 @@ Code parse_operator_function_or_variable( bool expects_function, CodeAttributes
return result;
}
internal inline
Code parse_complicated_definition( Parser::TokType which )
{
using namespace Parser;
push_scope();
labeled_scope_start
PARSE_FORWARD_OR_DEFINITION:
Code result = CodeInvalid;
// <which> <type_identifier>;
switch ( which )
{
case TokType::Decl_Class:
result = parse_class();
Context.pop();
return result;
case TokType::Decl_Enum:
result = parse_enum();
Context.pop();
return result;
case TokType::Decl_Struct:
result = parse_struct();
Context.pop();
return result;
case TokType::Decl_Union:
result = parse_union();
Context.pop();
return result;
default:
log_failure( "Error, wrong token type given to parse_complicated_definition "
"(only supports class, enum, struct, union) \n%s"
, Context.to_string() );
Context.pop();
return CodeInvalid;
}
labeled_scope_end
TokArray tokens = Context.Tokens;
s32 idx = tokens.Idx;
s32 level = 0;
for ( ; idx < tokens.Arr.num(); idx ++ )
{
if ( tokens[idx].Type == TokType::BraceCurly_Open )
level++;
if ( tokens[idx].Type == TokType::BraceCurly_Close )
level--;
if ( level == 0 && tokens[idx].Type == TokType::Statement_End )
break;
}
if ( (idx - 2 ) == tokens.Idx )
{
// Its a forward declaration only
goto PARSE_FORWARD_OR_DEFINITION;
}
Token tok = tokens[ idx - 1 ];
if ( tok.Type == TokType::Identifier )
{
tok = tokens[ idx - 2 ];
bool is_indirection = tok.Type == TokType::Ampersand
|| tok.Type == TokType::Star;
bool ok_to_parse = false;
if ( tok.Type == TokType::BraceCurly_Close )
{
// Its an inplace definition
// <which> <type_identifier> { ... } <identifier>;
ok_to_parse = true;
}
else if ( tok.Type == TokType::Identifier && tokens[ idx - 3 ].Type == TokType::Decl_Struct )
{
// Its a variable with type ID using struct namespace.
// <which> <type_identifier> <identifier>;
ok_to_parse = true;
}
else if ( is_indirection )
{
// Its a indirection type with type ID using struct namespace.
// <which> <type_identifier> <identifier>;
ok_to_parse = true;
}
if ( ! ok_to_parse )
{
log_failure( "Unsupported or bad member definition after struct declaration\n%s", Context.to_string() );
Context.pop();
return CodeInvalid;
}
Code result = parse_operator_function_or_variable( false, { nullptr }, { nullptr } );
Context.pop();
return result;
}
else if ( tok.Type == TokType::BraceCurly_Close )
{
// Its a definition
// <which> { ... };
goto PARSE_FORWARD_OR_DEFINITION;
}
else if ( tok.Type == TokType::BraceSquare_Close)
{
// Its an array definition
// <which> <type_identifier> <identifier> [ ... ];
Code result = parse_operator_function_or_variable( false, { nullptr }, { nullptr } );
Context.pop();
return result;
}
else
{
log_failure( "Unsupported or bad member definition after struct declaration\n%s", Context.to_string() );
Context.pop();
return CodeInvalid;
}
}
internal
CodeBody parse_class_struct_body( Parser::TokType which )
{
@ -2112,57 +2274,13 @@ CodeBody parse_class_struct_body( Parser::TokType which )
case TokType::Decl_Class:
{
s32 idx = Context.Tokens.Idx;
for ( ; Context.Tokens.Arr[idx].Type != TokType::Statement_End; idx ++)
{
if ( Context.Tokens.Arr[idx].Type == TokType::BraceCurly_Open )
{
idx = Context.Tokens.Idx;
break;
}
}
Token tok_before_end = Context.Tokens.Arr[ idx ];
if ( tok_before_end.Type == TokType::Identifier
|| tok_before_end.Type == TokType::Capture_End
|| tok_before_end.Type == TokType::Spec_Const
|| tok_before_end.Type == TokType::Spec_Volatile
|| tok_before_end.Type == TokType::Spec_Override
|| tok_before_end.Type == TokType::Spec_Final )
{
member = parse_operator_function_or_variable( false, attributes, specifiers );
break;
}
member = parse_class();
member = parse_complicated_definition( TokType::Decl_Class );
}
break;
case TokType::Decl_Enum:
{
s32 idx = Context.Tokens.Idx;
for ( ; Context.Tokens.Arr[idx].Type != TokType::Statement_End; idx ++)
{
if ( Context.Tokens.Arr[idx].Type == TokType::BraceCurly_Open )
{
idx = Context.Tokens.Idx;
break;
}
}
Token tok_before_end = Context.Tokens.Arr[ idx ];
if ( tok_before_end.Type == TokType::Identifier
|| tok_before_end.Type == TokType::Capture_End
|| tok_before_end.Type == TokType::Spec_Const
|| tok_before_end.Type == TokType::Spec_Volatile
|| tok_before_end.Type == TokType::Spec_Override
|| tok_before_end.Type == TokType::Spec_Final )
{
member = parse_operator_function_or_variable( false, attributes, specifiers );
break;
}
member = parse_enum();
member = parse_complicated_definition( TokType::Decl_Enum );
}
break;
@ -2176,29 +2294,7 @@ CodeBody parse_class_struct_body( Parser::TokType which )
case TokType::Decl_Struct:
{
s32 idx = Context.Tokens.Idx;
for ( ; Context.Tokens.Arr[idx].Type != TokType::Statement_End; idx ++)
{
if ( Context.Tokens.Arr[idx].Type == TokType::BraceCurly_Open )
{
idx = Context.Tokens.Idx;
break;
}
}
Token tok_before_end = Context.Tokens.Arr[ idx ];
if ( tok_before_end.Type == TokType::Identifier
|| tok_before_end.Type == TokType::Capture_End
|| tok_before_end.Type == TokType::Spec_Const
|| tok_before_end.Type == TokType::Spec_Volatile
|| tok_before_end.Type == TokType::Spec_Override
|| tok_before_end.Type == TokType::Spec_Final )
{
member = parse_operator_function_or_variable( false, attributes, specifiers );
break;
}
member = parse_struct();
member = parse_complicated_definition( TokType::Decl_Struct );
}
break;
@ -2212,29 +2308,7 @@ CodeBody parse_class_struct_body( Parser::TokType which )
case TokType::Decl_Union:
{
s32 idx = Context.Tokens.Idx;
for ( ; Context.Tokens.Arr[idx].Type != TokType::Statement_End; idx ++)
{
if ( Context.Tokens.Arr[idx].Type == TokType::BraceCurly_Open )
{
idx = Context.Tokens.Idx;
break;
}
}
Token tok_before_end = Context.Tokens.Arr[ idx ];
if ( tok_before_end.Type == TokType::Identifier
|| tok_before_end.Type == TokType::Capture_End
|| tok_before_end.Type == TokType::Spec_Const
|| tok_before_end.Type == TokType::Spec_Volatile
|| tok_before_end.Type == TokType::Spec_Override
|| tok_before_end.Type == TokType::Spec_Final )
{
member = parse_operator_function_or_variable( false, attributes, specifiers );
break;
}
member = parse_union();
member = parse_complicated_definition( TokType::Decl_Union );
}
break;
@ -2269,10 +2343,12 @@ CodeBody parse_class_struct_body( Parser::TokType which )
case TokType::Preprocess_Else:
member = preprocess_else;
eat( TokType::Preprocess_Else );
break;
case TokType::Preprocess_EndIf:
member = preprocess_endif;
eat( TokType::Preprocess_EndIf );
break;
case TokType::Preprocess_Unsupported:
@ -2383,7 +2459,7 @@ CodeBody parse_class_struct_body( Parser::TokType which )
}
internal
Code parse_class_struct( Parser::TokType which, bool from_typedef = false )
Code parse_class_struct( Parser::TokType which, bool inplace_def = false )
{
using namespace Parser;
@ -2451,7 +2527,7 @@ Code parse_class_struct( Parser::TokType which, bool from_typedef = false )
body = parse_class_struct_body( which );
}
if ( ! from_typedef )
if ( ! inplace_def )
eat( TokType::Statement_End );
if ( which == TokType::Decl_Class )
@ -2537,12 +2613,12 @@ CodeBody parse_global_nspace( CodeT which )
eat( TokType::Comment );
break;
case TokType::Decl_Enum:
member = parse_enum();
case TokType::Decl_Class:
member = parse_complicated_definition( TokType::Decl_Class );
break;
case TokType::Decl_Class:
member = parse_class();
case TokType::Decl_Enum:
member = parse_complicated_definition( TokType::Decl_Enum );
break;
case TokType::Decl_Extern_Linkage:
@ -2557,12 +2633,7 @@ CodeBody parse_global_nspace( CodeT which )
break;
case TokType::Decl_Struct:
if ( currtok.Line >= 2202 )
{
log_fmt("here");
}
member = parse_struct();
member = parse_complicated_definition( TokType::Decl_Struct );
break;
case TokType::Decl_Template:
@ -2574,7 +2645,7 @@ CodeBody parse_global_nspace( CodeT which )
break;
case TokType::Decl_Union:
member = parse_union();
member = parse_complicated_definition( TokType::Decl_Union );
break;
case TokType::Decl_Using:
@ -2723,11 +2794,11 @@ CodeBody parse_global_nspace( CodeT which )
}
internal
CodeClass parse_class( bool from_typedef )
CodeClass parse_class( bool inplace_def )
{
using namespace Parser;
push_scope();
CodeClass result = (CodeClass) parse_class_struct( Parser::TokType::Decl_Class, from_typedef );
CodeClass result = (CodeClass) parse_class_struct( Parser::TokType::Decl_Class, inplace_def );
Context.pop();
return result;
}
@ -2749,7 +2820,7 @@ CodeClass parse_class( StrC def )
}
internal
CodeEnum parse_enum( bool from_typedef )
CodeEnum parse_enum( bool inplace_def )
{
using namespace Parser;
using namespace ECode;
@ -2758,6 +2829,8 @@ CodeEnum parse_enum( bool from_typedef )
SpecifierT specs_found[16] { ESpecifier::NumSpecifiers };
s32 NumSpecifiers = 0;
CodeAttributes attributes = { nullptr };
Token name = { nullptr, 0, TokType::Invalid };
Code array_expr = { nullptr };
CodeType type = { nullptr };
@ -2776,7 +2849,7 @@ CodeEnum parse_enum( bool from_typedef )
is_enum_class = true;
}
// TODO : Parse attributes
attributes = parse_attributes();
if ( currtok.Type != TokType::Identifier )
{
@ -2809,6 +2882,17 @@ CodeEnum parse_enum( bool from_typedef )
while ( currtok.Type != TokType::BraceCurly_Close )
{
if ( currtok.Type == TokType::Comment )
{
eat( TokType::Comment );
continue;
}
else if ( currtok.Type == TokType::Preprocess_Macro )
{
eat( TokType::Preprocess_Macro );
continue;
}
eat( TokType::Identifier);
if ( currtok.Type == TokType::Operator && currtok.Text[0] == '=' )
@ -2832,7 +2916,7 @@ CodeEnum parse_enum( bool from_typedef )
eat( TokType::BraceCurly_Close );
}
if ( ! from_typedef )
if ( ! inplace_def )
eat( TokType::Statement_End );
using namespace ECode;
@ -2856,6 +2940,9 @@ CodeEnum parse_enum( bool from_typedef )
result->Name = get_cached_string( name );
if ( attributes )
result->Attributes = attributes;
if ( type )
result->UnderlyingType = type;
@ -3324,11 +3411,11 @@ CodeOpCast parse_operator_cast( StrC def )
}
internal inline
CodeStruct parse_struct( bool from_typedef )
CodeStruct parse_struct( bool inplace_def )
{
using namespace Parser;
push_scope();
CodeStruct result = (CodeStruct) parse_class_struct( TokType::Decl_Struct, from_typedef );
CodeStruct result = (CodeStruct) parse_class_struct( TokType::Decl_Struct, inplace_def );
Context.pop();
return result;
}
@ -3763,7 +3850,7 @@ CodeTypedef parse_typedef( StrC def )
}
internal
CodeUnion parse_union( bool from_typedef )
CodeUnion parse_union( bool inplace_def )
{
using namespace Parser;
push_scope();
@ -3805,7 +3892,7 @@ CodeUnion parse_union( bool from_typedef )
eat( TokType::BraceCurly_Close );
if ( ! from_typedef )
if ( ! inplace_def )
eat( TokType::Statement_End );
CodeUnion

3
project/dependencies/macros.hpp
View File

@ -86,6 +86,9 @@
} \
while(0);
#define labeled_scope_start if ( false ) {
#define labeled_scope_end }
#define clamp( x, lower, upper ) min( max( ( x ), ( lower ) ), ( upper ) )
#define count_of( x ) ( ( size_of( x ) / size_of( 0 [ x ] ) ) / ( ( sw )( ! ( size_of( x ) % size_of( 0 [ x ] ) ) ) ) )
#define is_between( x, lower, upper ) ( ( ( lower ) <= ( x ) ) && ( ( x ) <= ( upper ) ) )