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Unreal parsing support: Added MF_Allow_As_Attribute & MF_Allow_As_Definition

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This commit is contained in:
Edward R. Gonzalez
2024-12-15 13:39:00 -05:00
parent 572e957c17
commit 0b03b3cd92
5 changed files with 88 additions and 37 deletions
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3
base/components/ast_types.hpp
View File

@@ -42,13 +42,14 @@ struct AST_Body
};
static_assert( sizeof(AST_Body) == sizeof(AST), "ERROR: AST_Body is not the same size as AST");
// TODO(Ed): Support chaining attributes (Use parameter linkage pattern)
struct AST_Attributes
{
union {
char _PAD_[ sizeof(Specifier) * AST_ArrSpecs_Cap + sizeof(AST*) ];
StrCached Content;
};
StrCached Name;
StrCached Name;
Code Prev;
Code Next;
Token* Tok;

3
base/components/interface.cpp
View File

@@ -473,6 +473,7 @@ void register_macro( Macro macro ) {
GEN_ASSERT_NOT_NULL(macro.Name.Ptr);
GEN_ASSERT(macro.Name.Len > 0);
u32 key = crc32( macro.Name.Ptr, macro.Name.Len );
macro.Name = cache_str(macro.Name);
hashtable_set( _ctx->Macros, key, macro );
}
@@ -486,6 +487,7 @@ void register_macros( s32 num, ... )
Macro macro = va_arg(va, Macro);
GEN_ASSERT_NOT_NULL(macro.Name.Ptr);
GEN_ASSERT(macro.Name.Len > 0);
macro.Name = cache_str(macro.Name);
u32 key = crc32( macro.Name.Ptr, macro.Name.Len );
hashtable_set( _ctx->Macros, key, macro );
@@ -502,6 +504,7 @@ void register_macros( s32 num, Macro* macros )
Macro macro = * macros;
GEN_ASSERT_NOT_NULL(macro.Name.Ptr);
GEN_ASSERT(macro.Name.Len > 0);
macro.Name = cache_str(macro.Name);
u32 key = crc32( macro.Name.Ptr, macro.Name.Len );
hashtable_set( _ctx->Macros, key, macro );

43
base/components/lexer.cpp
View File

@@ -532,45 +532,24 @@ void lex_found_token( LexContext* ctx )
ctx->token.Type = macrotype_to_toktype(macro->Type);
b32 is_functional = macro_is_functional(* macro);
resolved_to_macro = has_args ? is_functional : ! is_functional;
if ( ! resolved_to_macro ) {
log_fmt("Info(%d, %d): %S identified as a macro but usage here does not resolve to one (interpreting as identifier)\n"
, ctx->token.Line
, ctx->token.Line
, macro->Name
);
}
}
if ( resolved_to_macro )
{
// TODO(Ed): When we introduce a macro AST (and expression support), we'll properly lex this section.
// Want to ignore any arguments the define may have as they can be execution expressions.
if ( has_args )
{
if ( has_args ) {
ctx->token.Flags |= TF_Macro_Functional;
// move_forward();
// ctx->token.Text.Len++;
// s32 level = 0;
// while ( ctx->left && ((* ctx->scanner) != ')' || level > 0) )
// {
// if ( (* ctx->scanner) == '(' )
// level++;
// else if ( (* ctx->scanner) == ')' && level > 0 )
// level--;
// move_forward();
// ctx->token.Text.Len++;
// }
// move_forward();
// ctx->token.Text.Len++;
}
//if ( (* ctx->scanner) == '\r' && ctx->scanner[1] == '\n' )
//{
// move_forward();
// ctx->token..Text.Length++;
//}
//else if ( (* ctx->scanner) == '\n' )
//{
// move_forward();
// ctx->token..Text.Length++;
//}
if ( bitfield_is_set(MacroFlags, macro->Flags, MF_Allow_As_Attribute) ) {
ctx->token.Flags |= TF_Attribute;
}
}
else
{

58
base/components/parser.cpp
View File

@@ -204,6 +204,7 @@ internal CodeBody parse_global_nspace ( CodeType which
internal Code parse_global_nspace_constructor_destructor( CodeSpecifiers specifiers );
internal Token parse_identifier ( bool* possible_member_function );
internal CodeInclude parse_include ();
internal Code parse_macro_as_definiton ( CodeAttributes attributes, CodeSpecifiers specifiers );
internal CodeOperator parse_operator_after_ret_type ( ModuleFlag mflags, CodeAttributes attributes, CodeSpecifiers specifiers, CodeTypename ret_type );
internal Code parse_operator_function_or_variable( bool expects_function, CodeAttributes attributes, CodeSpecifiers specifiers );
internal CodePragma parse_pragma ();
@@ -578,7 +579,7 @@ CodeAttributes parse_attributes()
s32 len = 0;
// There can be more than one attribute. If there is flatten them to a single string.
// TODO(Ed): Support keeping an linked list of attributes similar to parameters
// TODO(Ed): Support chaining attributes (Use parameter linkage pattern)
while ( left && tok_is_attribute(currtok) )
{
if ( check( Tok_Attribute_Open ) )
@@ -2434,6 +2435,12 @@ Code parse_operator_function_or_variable( bool expects_function, CodeAttributes
Code result = InvalidCode;
Code macro_stmt = parse_macro_as_definiton(attributes, specifiers);
if (macro_stmt) {
parser_pop(& _ctx->parser);
return macro_stmt;
}
CodeTypename type = parser_parse_type( parser_not_from_template, nullptr );
// <Attributes> <Specifiers> <ReturnType/ValueType>
@@ -2506,6 +2513,36 @@ Code parse_operator_function_or_variable( bool expects_function, CodeAttributes
return result;
}
internal
Code parse_macro_as_definiton( CodeAttributes attributes, CodeSpecifiers specifiers )
{
push_scope();
if (currtok.Type != Tok_Preprocess_Macro_Stmt ) {
parser_pop(& _ctx->parser);
return NullCode;
}
Macro* macro = lookup_macro(currtok.Text);
b32 can_resolve_to_definition = macro && bitfield_is_set(MacroFlags, macro->Flags, MF_Allow_As_Definition);
if ( ! can_resolve_to_definition) {
parser_pop(& _ctx->parser);
return NullCode;
}
// TODO(Ed): When AST_Macro is made, have it support attributs and specifiers for when its behaving as a declaration/definition.
Code code = parse_simple_preprocess( Tok_Preprocess_Macro_Stmt );
// Attributes and sepcifiers will be collapsed into the macro's serialization.
StrBuilder resolved_definition = strbuilder_fmt_buf(_ctx->Allocator_Temp, "%S %S %S"
, attributes ? strbuilder_to_str( attributes_to_strbuilder(attributes)) : txt("")
, specifiers ? strbuilder_to_str( specifiers_to_strbuilder(specifiers)) : txt("")
, code->Content
);
Code result = untyped_str( strbuilder_to_str(resolved_definition) );
parser_pop(& _ctx->parser);
return result;
}
internal
CodePragma parse_pragma()
{
@@ -3761,8 +3798,11 @@ CodeEnum parser_parse_enum( bool inplace_def )
// Unreal UMETA macro support
if ( currtok.Type == Tok_Preprocess_Macro_Expr ) {
eat( Tok_Preprocess_Macro_Expr );
Code macro = parse_simple_preprocess( Tok_Preprocess_Macro_Expr );
// <Name> = <Expression> <Macro>
// We're intentially ignoring this code as its going to be serialized as an untyped string with the rest of the enum "entry".
// TODO(Ed): We need a CodeEnumEntry, AST_EnumEntry types
}
if ( currtok.Type == Tok_Comma )
@@ -4060,6 +4100,13 @@ CodeFn parser_parse_function()
}
// <export> <Attributes> <Specifiers>
// Note(Ed): We're enforcing that using this codepath requires non-macro jank.
// Code macro_stmt = parse_macro_as_definiton(attributes, specifiers);
// if (macro_stmt) {
// parser_pop(& _ctx->parser);
// return macro_stmt;
// }
CodeTypename ret_type = parser_parse_type(parser_not_from_template, nullptr);
if ( cast(Code, ret_type) == Code_Invalid ) {
parser_pop(& _ctx->parser);
@@ -5448,6 +5495,13 @@ CodeVar parser_parse_variable()
}
// <ModuleFlags> <Attributes> <Specifiers>
// Note(Ed): We're enforcing that using this codepath requires non-macro jank.
// Code macro_stmt = parse_macro_as_definiton(attributes, specifiers);
// if (macro_stmt) {
// parser_pop(& _ctx->parser);
// return macro_stmt;
// }
CodeTypename type = parser_parse_type(parser_not_from_template, nullptr);
// <ModuleFlags> <Attributes> <Specifiers> <ValueType>

18
base/components/parser_types.hpp
View File

@@ -177,8 +177,22 @@ enum EMacroFlags : u16
{
MF_Functional = bit(0), // Macro has parameters (args expected to be passed)
MF_Expects_Body = bit(1), // Expects to assign a braced scope to its body.
MF_Allow_As_Identifier = bit(2), // lex__eat wil treat this macro as an identifier if the parser attempts to consume it as one.
// ^^^ This is a sort of kludge because we don't support push/pop macro programs rn. ^^^
// lex__eat wil treat this macro as an identifier if the parser attempts to consume it as one.
// ^^^ This is a kludge because we don't support push/pop macro pragmas rn.
MF_Allow_As_Identifier = bit(2),
// lex__eat wil treat this macro as an attribute if the parser attempts to consume it as one.
// ^^^ This a kludge because unreal has a macro that behaves as both a 'statement' and an attribute (UE_DEPRECATED, PRAGMA_ENABLE_DEPRECATION_WARNINGS, etc)
// TODO(Ed): We can keep the MF_Allow_As_Attribute flag for macros, however, we need to add the ability of AST_Attributes to chain themselves.
// Its thats already a thing in the standard language anyway
// & it would allow UE_DEPRECATED, (UE_PROPERTY / UE_FUNCTION) to chain themselves as attributes of a resolved member function/varaible definition
MF_Allow_As_Attribute = bit(3),
// When a macro is encountered after attributs and specifiers while parsing a function, or variable:
// It will consume the macro and treat it as resolving the definition. (Yes this is for Unreal Engine)
// (MUST BE OF MT_Statement TYPE)
MF_Allow_As_Definition = bit(4),
MF_Null = 0,
MF_UnderlyingType = GEN_U16_MAX,