Data Structures | |
| struct | token |
Functions | |
| static int | token () |
| static const char * | advance () |
| static const char * | print_token () |
| static const char * | print_cur_token () |
| static void ATTRIBUTE_PRINTF_1 | parse_error () |
| static const char * | require () |
| static const char * | require_without_advance () |
| static const char * | require2 () |
| static const char * | string_seq () |
| static const char * | require_template_declaration () |
| static const char * | typedef_name () |
| static void | consume_balanced () |
| static void | consume_until_eos () |
| static bool | consume_until_comma_or_eos () |
| static type_p | type (options_p *optsp, bool nested) |
| static options_p | str_optvalue_opt () |
| static type_p | absdecl () |
| static options_p | type_optvalue () |
| static options_p | nestedptr_optvalue () |
| static options_p | option () |
| static options_p | option_seq () |
| static options_p | gtymarker () |
| static options_p | gtymarker_opt () |
| static type_p | array_and_function_declarators_opt () |
| static type_p | inner_declarator (type_p, const char **, options_p *, bool) |
| static type_p | direct_declarator (type_p ty, const char **namep, options_p *optsp, bool in_struct) |
| static type_p | declarator (type_p ty, const char **namep, options_p *optsp, bool in_struct=false) |
| static pair_p | struct_field_seq () |
| bool | opts_have () |
| static type_p | type () |
| static void | typedef_decl () |
| static void | struct_or_union () |
| static void | extern_or_static () |
| void | parse_file () |
Variables | |
| static struct token | T |
| static const char *const | token_names [] |
| static const char *const | token_value_format [] |
Function Documentation
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absdecl: type '*'* – a vague approximation to what the C standard calls an abstract declarator. The only kinds that are actually used are those that are just a bare type and those that have trailing pointer-stars. Further kinds should be implemented if and when they become necessary. Used only within option values, therefore further tags within the type are invalid. Note that the return value has already been run through adjust_field_type.
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Retrieve the value of the current token (if any) and mark it consumed. The next call to token() will get another token from the lexer.
Referenced by array_and_function_declarators_opt(), gtymarker(), inner_declarator(), option(), require2(), and require_without_advance().
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Declarators. The logic here is largely lifted from c-parser.c. Note that we do not have to process abstract declarators, which can appear only in parameter type lists or casts (but see absdecl, above). Also, type qualifiers are thrown out in gengtype-lex.l so we don't have to do it. array_and_function_declarators_opt: array_and_function_declarators_opt ARRAY array_and_function_declarators_opt '(' ... ')'
where '...' indicates stuff we ignore except insofar as grouping symbols ()[]{} must balance.
Subroutine of direct_declarator - do not use elsewhere.
We don't need exact types for functions.
References advance(), gtymarker(), NULL, and require().
Referenced by gtymarker(), and gtymarker_opt().
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Absorb a sequence of tokens delimited by balanced ()[]{}.
Referenced by gtymarker_opt().
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Absorb a sequence of tokens, possibly including ()[]{}-delimited expressions, until we encounter a comma or semicolon outside any such delimiters; absorb that too. Returns true if the loop ended with a comma.
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Absorb a sequence of tokens, possibly including ()[]{}-delimited expressions, until we encounter an end-of-statement marker (a ';' or a '}') outside any such delimiters; absorb that too.
Referenced by declarator().
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declarator: '*'+ direct_declarator
This is the sole public interface to this part of the grammar. Arguments are the type known so far, a pointer to where the name may be stored, and a pointer to where GTY options may be stored.
IN_STRUCT is true when we are called to parse declarators inside a structure or class.
Returns the final type.
References consume_until_eos().
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direct_declarator: '(' inner_declarator ')' '(' ')' <– C++ ctors/dtors gtymarker_opt ID array_and_function_declarators_opt
Subroutine of declarator, mutually recursive with inner_declarator; do not use elsewhere.
IN_STRUCT is true if we are called while parsing structures or classes.
The first token in a direct-declarator must be an ID, a GTY marker, or an open parenthesis.
fall through
If the next token is '(', we are parsing a function declaration.
Functions are ignored by gengtype, so we return NULL. If the declarator starts with a '(', we have three options. We
are either parsing 'TYPE (*ID)' (i.e., a function pointer)
or 'TYPE(...)'.
The latter will be a constructor iff we are inside a
structure or class. Otherwise, it could be a typedef, but
since we explicitly reject typedefs inside structures, we can
assume that we found a ctor and return NULL. Found a constructor. Find and consume the closing ')'.
Tell the caller to ignore this.
Any C++ keyword like 'operator' means that we are not looking
at a regular data declarator. Do _not_ advance if what we have is a close squiggle brace, as
we will get much better error recovery that way.
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GC root declaration: (extern|static) gtymarker? type ID array_declarators_opt (';'|'=') If the gtymarker is not present, we ignore the rest of the declaration.
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GTY marker: 'GTY' '(' '(' option_seq? ')' ')'
References advance(), and array_and_function_declarators_opt().
Referenced by array_and_function_declarators_opt(), and option_seq().
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Optional GTY marker.
References array_and_function_declarators_opt(), and consume_balanced().
Referenced by type().
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The difference between inner_declarator and declarator is in the handling of stars. Consider this declaration:
char * (*pfc) (void)
It declares a pointer to a function that takes no arguments and returns a char*. To construct the correct type for this declaration, the star outside the parentheses must be processed before the function type, the star inside the parentheses must be processed after the function type. To accomplish this, declarator() creates pointers before recursing (it is actually coded as a while loop), whereas inner_declarator() recurses before creating pointers. inner_declarator: '*' inner_declarator direct_declarator
Mutually recursive subroutine of direct_declarator; do not use elsewhere.
IN_STRUCT is true if we are called while parsing structures or classes.
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Nested pointer data: '(' type '*'* ',' string_seq ',' string_seq ')'
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One option: ID str_optvalue_opt | PTR_ALIAS type_optvalue | PARAM_IS type_optvalue | NESTED_PTR nestedptr_optvalue
References advance().
Referenced by enum_arg_to_value(), generate_option(), and option_flag_var().
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One comma-separated list of options.
References gtymarker().
| bool opts_have | ( | ) |
Return true if OPTS contain the option named STR.
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Report a parse error on the current line, with diagnostic MSG. Behaves as standard printf with respect to additional arguments and format escapes.
Referenced by require(), and require_without_advance().
| void parse_file | ( | ) |
Parse the file FNAME for GC-relevant declarations and definitions. This is the only entry point to this file.
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Convenience wrapper around print_token which produces the printable representation of the current token.
References fileloc::file, get_input_file_name(), lexer_line, and fileloc::line.
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Produce a printable representation for a token defined by CODE and VALUE. This sometimes returns pointers into malloc memory and sometimes not, therefore it is unsafe to free the pointer it returns, so that memory is leaked. This does not matter, as this function is only used for diagnostics, and in a successful run of the program there will be none.
Referenced by require(), and require_without_advance().
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If the next token does not have code T, report a parse error; otherwise return the token's value.
References parse_error(), print_token(), T, token(), and token::value.
Referenced by array_and_function_declarators_opt(), and require2().
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If the next token does not have one of the codes T1 or T2, report a parse error; otherwise return the token's value.
References advance(), CONST_CAST, and require().
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The caller has detected a template declaration that starts with TMPL_NAME. Parse up to the closing '>'. This recognizes simple template declarations of the form ID<ID1,ID2,...,IDn>. It does not try to parse anything more sophisticated than that.
Returns the template declaration string "ID<ID1,ID2,...,IDn>".
Recognize the opening '<'.
Read the comma-separated list of identifiers.
Recognize the closing '>'.
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As per require, but do not advance.
References advance(), parse_error(), print_token(), and token().
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Optional parenthesized string: ('(' string_seq ')')?
Referenced by type_optvalue().
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Near-terminals. C-style string constant concatenation: STRING+ Bare STRING should appear nowhere else in this file.
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Types and declarations. Structure field(s) declaration: ( type bitfield ';' | type declarator bitfield? ( ',' declarator bitfield? )+ ';' )*
Knows that such declarations must end with a close brace (or, erroneously, at EOF).
Ignore access-control keywords ("public:" etc).
There could be any number of weird things after the declarator,
notably bitfield declarations and __attribute__s. If this
function returns true, the last thing was a comma, so we have
more than one declarator paired with the current type.
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Structure definition: type() does all the work.
There may be junk after the type: notably, we cannot currently distinguish 'struct foo *function(prototype);' from 'struct foo;' ... we could call declarator(), but it's a waste of time at present. Instead, just eat whatever token is currently lookahead and go back to lexical skipping mode.
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Retrieve the code of the current token; if there is no current token, get the next one from the lexer.
Referenced by require(), and require_without_advance().
option handling.
Referenced by add_data_member_location_attribute(), add_loc_list(), aff_combination_remove_elt(), backtrace_base_for_ref(), build2_stat(), build_constructor(), compute_argument_block_size(), convert_to_real(), copy_declaration_context(), create_loads_and_stores_for_name(), double_int_to_tree(), ehspec_hasher::equal(), expand_builtin_va_copy(), expand_omp_atomic_load(), expand_omp_for_init_vars(), expand_omp_sections(), extr_type_from_vtbl_ptr_store(), extract_range_from_comparison(), finalize_task_copyfn(), fold_build2_stat_loc(), fold_builtin_cbrt(), fold_builtin_toascii(), generate_subtree_copies(), get_emutls_object_name(), gimplify_switch_expr(), go_output_typedef(), handle_param(), init_eh_for_function(), inner_declarator(), ipa_initialize_node_params(), ipa_set_jf_simple_pass_through(), lookup_tramp_for_decl(), lra_update_dups(), max_stmt_executions_tree(), move_variant_to_index(), number_of_iterations_cond(), push_reg_equiv_alt_mem(), scev_reset_htab(), set_value_varying(), simplify_using_outer_evolutions(), single_element_loc_list_p(), vect_can_advance_ivs_p(), vect_finish_stmt_generation(), and write_state().
This is called type(), but what it parses (sort of) is what C calls declaration-specifiers and specifier-qualifier-list:
SCALAR | ID // typedef | (STRUCT|UNION) ID? gtymarker? ( '{' gtymarker? struct_field_seq '}' )? | ENUM ID ( '{' ... '}' )?
Returns a partial type; under some conditions (notably "struct foo thing;") it may write an options structure to *OPTSP.
NESTED is true when parsing a declaration already known to have a GTY marker. In these cases, typedef and enum declarations are not allowed because gengtype only understands types at the global scope.
By returning NULL here, we indicate to the caller that they
should ignore everything following this keyword up to the
next ';' or '}'.
GTY annotations follow attribute syntax
GTY_BEFORE_ID is for union/struct declarations
GTY_AFTER_ID is for variable declarations. Top-level structures that are not explicitly tagged are treated as mere forward declarations. This is because
there are a lot of structures that we don't need to know
about, and some of those have C++ and macro constructs that
we cannot handle. Unfortunately above GTY_TOKEN check does not capture the
typedef struct_type GTY case. For GTY-marked types that are not "user", parse some C++
inheritance specifications.
We require single-inheritance from a non-template type. This may be either an access specifier, or the base name.
For types lacking GTY-markings, skip over C++ inheritance
specification (and thus avoid having to parse e.g. template
types). Do not look inside user defined structures.
In C++, a typedef inside a struct/class/union defines a new
type for that inner scope. We cannot support this in
gengtype because we have no concept of scoping.
We handle typedefs in the global scope separately (see
parse_file), so if we find a 'typedef', we must be inside
a struct. If after parsing the enum we are at the end of the statement,
and we are currently inside a structure, then this was an
enum declaration inside this scope.
We cannot support this for the same reason we cannot support
'typedef' inside structures (see the TYPEDEF handler above).
If this happens, emit an error and return NULL.
References gtymarker_opt().
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Type-option: '(' absdecl ')'
References str_optvalue_opt().
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Top level constructs. Dispatch declarations beginning with 'typedef'.
Yet another place where we could have junk (notably attributes) after the declarator.
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typedef_name: either an ID, or a template type specification of the form ID<t1,t2,...,tn>.
Variable Documentation
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Diagnostics. This array is indexed by the token code minus CHAR_TOKEN_OFFSET.
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This array is indexed by token code minus FIRST_TOKEN_WITH_VALUE.
