768 lines
16 KiB
Plaintext
768 lines
16 KiB
Plaintext
/*
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* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
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* See the copyright notice in the ACK home directory, in the file "Copyright".
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*/
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/* $Id$ */
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/* DECLARATION SYNTAX PARSER */
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{
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#include "lint.h"
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#include "dbsymtab.h"
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#include <alloc.h>
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#include "nobitfield.h"
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#include "debug.h"
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#include <flt_arith.h>
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#include "arith.h"
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#include "LLlex.h"
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#include "label.h"
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#include "code.h"
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#include "idf.h"
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#include "type.h"
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#include "proto.h"
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#include "struct.h"
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#include "field.h"
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#include "decspecs.h"
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#include "def.h"
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#include "declar.h"
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#include "label.h"
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#include "expr.h"
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#include "sizes.h"
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#include "level.h"
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#ifdef LINT
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#include "l_lint.h"
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#endif /* LINT */
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extern char options[];
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}
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/* 3.5 */
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declaration
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{struct decspecs Ds;}
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:
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{Ds = null_decspecs;}
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decl_specifiers(&Ds)
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init_declarator_list(&Ds)?
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';'
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;
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/* A `decl_specifiers' describes a sequence of a storage_class_specifier,
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an unsigned_specifier, a size_specifier and a simple type_specifier,
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which may occur in arbitrary order and each of which may be absent;
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at least one of them must be present, however, since the totally
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empty case has already be dealt with in `external_definition'.
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This means that something like:
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unsigned extern int short xx;
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is perfectly legal C.
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On top of that, multiple occurrences of storage_class_specifiers,
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unsigned_specifiers and size_specifiers are errors, but a second
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type_specifier should end the decl_specifiers and be treated as
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the name to be declared.
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Such a language is not easily expressed in a grammar; enumeration
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of the permutations is unattractive. We solve the problem by
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having a regular grammar for the "soft" items, handling the single
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occurrence of the type_specifier in the grammar (we have no choice),
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collecting all data in a `struct decspecs' and turning that data
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structure into what we want.
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The existence of declarations like
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short typedef yepp;
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makes all hope of writing a specific grammar for typedefs illusory.
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*/
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/* Accept a single declaration specifier. Then accept zero or more
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declaration specifiers. There can be a conflict on both
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TYPE_IDENTIFIER and IDENTIFIER.
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The following rule is used:
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When we see a TYPE_IDENTIFIER, we accept it if no type-specifier was
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given, and it is not directly followed by an identifier. If a
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type-specifier was given, it is taken as the identifier being
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declared. If it is followed by an identifier, we assume that an
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error has been made, (e.g. unsigned typedeffed_int x;) and that
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this will be detected later on.
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When we see an IDENTIFIER, directly followed by another IDENTIFIER,
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we assume that a typing mistake has been made, and we accept it as
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an erroneous type-identifier.
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*/
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decl_specifiers /* non-empty */ (register struct decspecs *ds;)
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/* Reads a non-empty decl_specifiers and fills the struct
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decspecs *ds.
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*/
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:
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single_decl_specifier(ds)
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[ %while( (DOT==TYPE_IDENTIFIER
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&& ds->ds_size == 0
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&& ds->ds_unsigned == 0
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&& ds->ds_type == (struct type *)0)
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|| AHEAD == IDENTIFIER) /* always an error */
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single_decl_specifier(ds)
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]*
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{do_decspecs(ds);}
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;
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single_decl_specifier /* non_empty */ (register struct decspecs *ds;)
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:
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[ AUTO | STATIC | EXTERN | TYPEDEF | REGISTER ]
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{ if (ds->ds_sc_given)
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error("repeated storage class specifier");
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ds->ds_sc_given = 1;
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ds->ds_sc = DOT;
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}
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VOLATILE
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{ if (ds->ds_typequal & TQ_VOLATILE)
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error("repeated type qualifier");
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ds->ds_typequal |= TQ_VOLATILE;
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}
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CONST
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{ if (ds->ds_typequal & TQ_CONST)
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error("repeated type qualifier");
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ds->ds_typequal |= TQ_CONST;
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}
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[ SHORT | LONG ]
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{ if (ds->ds_size)
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error("repeated size specifier");
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ds->ds_size = DOT;
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}
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[ SIGNED | UNSIGNED ]
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{ if (ds->ds_unsigned != 0)
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error("repeated sign specifier");
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ds->ds_unsigned = DOT;
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}
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[ VOID | CHAR | INT | FLOAT | DOUBLE ]
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{
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idf2type(dot.tk_idf, &ds->ds_type);
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ds->ds_typedef = 0;
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}
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%default TYPE_IDENTIFIER
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{
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idf2type(dot.tk_idf, &ds->ds_type);
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ds->ds_typedef = 1;
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}
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%erroneous
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IDENTIFIER
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{
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error("%s is not a type identifier", dot.tk_idf->id_text);
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ds->ds_type = error_type;
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if (dot.tk_idf->id_def) {
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dot.tk_idf->id_def->df_type = error_type;
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dot.tk_idf->id_def->df_sc = TYPEDEF;
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}
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}
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%illegal
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IDENTIFIER
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struct_or_union_specifier(&ds->ds_type)
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enum_specifier(&ds->ds_type)
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;
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/* 3.5.2 */
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type_specifier(struct type **tpp;)
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/* Used in struct/union declarations and in casts; only the
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type is relevant.
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*/
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{struct decspecs Ds; Ds = null_decspecs;}
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:
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decl_specifiers(&Ds)
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{
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if (Ds.ds_sc_given)
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error("storage class ignored");
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if (Ds.ds_sc == REGISTER)
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error("register ignored");
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}
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{*tpp = Ds.ds_type;}
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;
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/* 3.5 */
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init_declarator_list(struct decspecs *ds;):
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init_declarator(ds)
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[ ',' init_declarator(ds) ]*
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;
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init_declarator(register struct decspecs *ds;)
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{
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struct declarator Dc;
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}
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:
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{
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Dc = null_declarator;
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}
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[
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declarator(&Dc)
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{
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reject_params(&Dc);
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declare_idf(ds, &Dc, level);
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#ifdef LINT
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lint_declare_idf(Dc.dc_idf, ds->ds_sc);
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#endif /* LINT */
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}
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[
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initializer(Dc.dc_idf, ds->ds_sc)
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{ code_declaration(Dc.dc_idf, (struct expr *) 0, level, ds->ds_sc); }
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]
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]
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{
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#ifdef LINT
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add_auto(Dc.dc_idf);
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#endif /* LINT */
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remove_declarator(&Dc);
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}
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;
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/* 3.5.7: initializer */
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initializer(struct idf *idf; int sc;)
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{
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struct expr *expr = (struct expr *) 0;
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int fund = idf->id_def->df_type->tp_fund;
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int autoagg = (level >= L_LOCAL
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&& sc != STATIC
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&& ( fund == STRUCT
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|| fund == UNION
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|| fund == ARRAY));
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int globalflag = level == L_GLOBAL
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|| (level >= L_LOCAL && sc == STATIC);
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}
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:
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{ if (idf->id_def->df_type->tp_fund == FUNCTION) {
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error("illegal initialization of function");
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idf->id_def->df_type->tp_fund = ERRONEOUS;
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}
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if (level == L_FORMAL2)
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error("illegal initialization of formal parameter");
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}
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'='
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{
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if (AHEAD != '{' && AHEAD != STRING ) autoagg = 0;
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#ifdef LINT
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lint_statement();
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#endif /* LINT */
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if (globalflag) {
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struct expr ex;
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code_declaration(idf, &ex, level, sc);
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}
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else if (autoagg)
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loc_init((struct expr *) 0, idf);
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}
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initial_value((globalflag || autoagg) ?
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&(idf->id_def->df_type)
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: (struct type **)0,
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&expr)
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{ if (! globalflag) {
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if (idf->id_def->df_type->tp_fund == FUNCTION) {
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free_expression(expr);
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expr = 0;
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}
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#ifdef DEBUG
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print_expr("initializer-expression", expr);
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#endif /* DEBUG */
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#ifdef LINT
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change_state(idf, SET);
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#endif /* LINT */
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#ifdef DBSYMTAB
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if (options['g'] && level >= L_LOCAL && expr) {
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db_line(expr->ex_file, (unsigned) expr->ex_line);
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}
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#endif /* DBSYMTAB */
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if (autoagg)
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loc_init((struct expr *) 0, idf);
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else code_declaration(idf, expr, level, sc);
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}
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#ifdef DBSYMTAB
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if (options['g'] && globalflag) {
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stb_string(idf->id_def, sc, idf->id_text);
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}
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#endif /* DBSYMTAB */
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idf_initialized(idf);
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}
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;
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/*
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Functions yielding pointers to functions must be declared as, e.g.,
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int (*hehe(par1, par2))() char *par1, *par2; {}
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Since the function heading is read as a normal declarator,
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we just include the (formal) parameter list in the declarator
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description list dc.
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*/
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/* 3.5.4 */
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declarator(register struct declarator *dc;)
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{ struct formal *fm = NO_PARAMS;
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struct proto *pl = NO_PROTO;
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arith count;
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int qual;
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}
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:
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primary_declarator(dc)
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[/*%while(1)*/
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'('
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[ %if (DOT != IDENTIFIER)
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parameter_type_list(&pl)
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formal_list(&fm)
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/* empty */
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]
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')'
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{ add_decl_unary(dc, FUNCTION, 0, (arith)0, fm, pl);
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fm = NO_PARAMS;
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}
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arrayer(&count)
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{add_decl_unary(dc, ARRAY, 0, count, NO_PARAMS, NO_PROTO);}
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]*
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pointer(&qual) declarator(dc)
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{add_decl_unary(dc, POINTER, qual, (arith)0, NO_PARAMS, NO_PROTO);}
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;
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primary_declarator(register struct declarator *dc;) :
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identifier(&dc->dc_idf)
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'(' declarator(dc) ')'
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;
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arrayer(arith *sizep;)
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{ struct expr *expr; }
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:
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'['
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{ *sizep = (arith)-1; }
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[
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constant_expression(&expr)
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{
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check_array_subscript(expr);
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*sizep = expr->VL_VALUE;
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free_expression(expr);
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}
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]?
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']'
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;
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formal_list (struct formal **fmp;)
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:
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formal(fmp) [ %persistent ',' formal(fmp) ]*
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;
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formal(struct formal **fmp;)
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{struct idf *idf; }
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:
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identifier(&idf)
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{
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register struct formal *new = new_formal();
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new->fm_idf = idf;
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new->next = *fmp;
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*fmp = new;
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if (idf->id_def && idf->id_def->df_sc == TYPEDEF) {
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error("typedef name %s may not be redeclared as a parameter", idf->id_text);
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}
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}
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;
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/* Change 2 */
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enum_specifier(register struct type **tpp;)
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{
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struct idf *idf;
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arith l = (arith)0;
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}
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:
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{if (*tpp) error("multiple types in declaration");}
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ENUM
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[
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{declare_struct(ENUM, (struct idf *) 0, tpp);}
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enumerator_pack(*tpp, &l)
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identifier(&idf)
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[
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{declare_struct(ENUM, idf, tpp);}
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enumerator_pack(*tpp, &l)
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{
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#ifdef DBSYMTAB
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if (options['g']) {
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stb_tag(idf->id_tag, idf->id_text);
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}
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#endif /*DBSYMTAB */
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}
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{apply_struct(ENUM, idf, tpp);}
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/* empty */
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]
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]
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;
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enumerator_pack(register struct type *tp; arith *lp;) :
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'{'
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enumerator(tp, lp)
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[%while (AHEAD != '}')
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','
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enumerator(tp, lp)
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]*
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[
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',' {warning("unexpected trailing comma in enumerator pack");}
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]?
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'}'
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{tp->tp_size = int_size;}
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/* fancy implementations that put small enums in 1 byte
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or so should start here.
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*/
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;
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enumerator(struct type *tp; arith *lp;)
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{
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struct idf *idf;
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struct expr *expr;
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}
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:
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identifier(&idf)
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[
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'='
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constant_expression(&expr)
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{
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*lp = expr->VL_VALUE;
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free_expression(expr);
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}
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]?
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{declare_enum(tp, idf, (*lp)++);}
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;
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/* 8.5 */
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struct_or_union_specifier(register struct type **tpp;)
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{
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int fund;
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struct idf *idfX;
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register struct idf *idf;
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}
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:
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{if (*tpp) error("multiple types in declaration");}
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[ STRUCT | UNION ]
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{fund = DOT;}
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[
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{
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declare_struct(fund, (struct idf *)0, tpp);
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}
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struct_declaration_pack(*tpp)
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identifier(&idfX) { idf = idfX; }
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[
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{
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declare_struct(fund, idf, tpp);
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(idf->id_tag->tg_busy)++;
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}
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struct_declaration_pack(*tpp)
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{
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(idf->id_tag->tg_busy)--;
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#ifdef DBSYMTAB
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if (options['g']) {
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stb_tag(idf->id_tag, idf->id_text);
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}
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#endif /*DBSYMTAB */
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}
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{
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/* a ';' means an empty declaration (probably)
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* this means that we have to declare a new
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* structure. (yegh)
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*/
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if (DOT == ';' &&
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( !idf->id_tag ||
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idf->id_tag->tg_level != level ||
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idf->id_tag->tg_type->tp_size < 0
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)) declare_struct(fund, idf, tpp);
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else apply_struct(fund, idf, tpp);
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}
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/* empty */
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]
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]
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;
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struct_declaration_pack(register struct type *stp;)
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{
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struct sdef **sdefp = &stp->tp_sdef;
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arith size = (arith)0;
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}
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:
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/* The size is only filled in after the whole struct has
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been read, to prevent recursive definitions.
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*/
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'{'
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struct_declaration(stp, &sdefp, &size)+
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'}'
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{stp->tp_size = align(size, stp->tp_align);
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completed(stp);
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}
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;
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struct_declaration(struct type *stp; struct sdef ***sdefpp; arith *szp;)
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{struct type *tp;}
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:
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type_specifier(&tp) struct_declarator_list(tp, stp, sdefpp, szp) ';'
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;
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struct_declarator_list(struct type *tp; struct type *stp;
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struct sdef ***sdefpp; arith *szp;)
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:
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struct_declarator(tp, stp, sdefpp, szp)
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[ ',' struct_declarator(tp, stp, sdefpp, szp) ]*
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;
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struct_declarator(struct type *tp; struct type *stp;
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struct sdef ***sdefpp; arith *szp;)
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{
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struct declarator Dc;
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struct field *fd = 0;
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}
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:
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{
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Dc = null_declarator;
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}
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[
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declarator(&Dc)
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{reject_params(&Dc);}
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bit_expression(&fd)?
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{Dc.dc_idf = gen_idf();}
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bit_expression(&fd)
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]
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{add_sel(stp, declare_type(tp, &Dc), Dc.dc_idf, sdefpp, szp, fd);}
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{remove_declarator(&Dc);}
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;
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bit_expression(struct field **fd;)
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{ struct expr *expr; }
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:
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{
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*fd = new_field();
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}
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':'
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constant_expression(&expr)
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{
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(*fd)->fd_width = expr->VL_VALUE;
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free_expression(expr);
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#ifdef NOBITFIELD
|
|
error("bitfields are not implemented");
|
|
#endif /* NOBITFIELD */
|
|
}
|
|
;
|
|
|
|
/* 8.7 */
|
|
cast(struct type **tpp;)
|
|
{struct declarator Dc;}
|
|
:
|
|
{Dc = null_declarator;}
|
|
'('
|
|
type_specifier(tpp)
|
|
abstract_declarator(&Dc)
|
|
')'
|
|
{*tpp = declare_type(*tpp, &Dc);}
|
|
{remove_declarator(&Dc);}
|
|
;
|
|
|
|
/* This code is an abject copy of that of 'declarator', for lack of
|
|
a two-level grammar.
|
|
*/
|
|
abstract_declarator(register struct declarator *dc;)
|
|
{ struct proto *pl = NO_PROTO;
|
|
arith count;
|
|
int qual;
|
|
}
|
|
:
|
|
primary_abstract_declarator(dc)
|
|
[
|
|
'('
|
|
[
|
|
parameter_type_list(&pl)
|
|
|
|
|
/* empty */
|
|
]
|
|
')'
|
|
{add_decl_unary(dc, FUNCTION, 0, (arith)0, NO_PARAMS, pl);
|
|
if (pl) remove_proto_idfs(pl);
|
|
}
|
|
|
|
|
arrayer(&count)
|
|
{add_decl_unary(dc, ARRAY, 0, count, NO_PARAMS, NO_PROTO);}
|
|
]*
|
|
|
|
|
pointer(&qual) abstract_declarator(dc)
|
|
{add_decl_unary(dc, POINTER, qual, (arith)0, NO_PARAMS, NO_PROTO);}
|
|
;
|
|
|
|
%first first_of_parameter_type_list, parameter_type_list;
|
|
|
|
primary_abstract_declarator(struct declarator *dc;)
|
|
:
|
|
[%if (AHEAD == ')' || first_of_parameter_type_list(AHEAD))
|
|
/* empty */
|
|
|
|
|
'(' abstract_declarator(dc) ')'
|
|
]
|
|
;
|
|
|
|
parameter_type_list(struct proto **plp;)
|
|
{ int save_level; }
|
|
:
|
|
{ if (level > L_PROTO) {
|
|
save_level = level;
|
|
level = L_PROTO;
|
|
} else level--;
|
|
}
|
|
parameter_decl_list(plp)
|
|
[
|
|
',' ELLIPSIS
|
|
{ register struct proto *new = new_proto();
|
|
|
|
new->next = *plp;
|
|
new->pl_flag = PL_ELLIPSIS;
|
|
*plp = new;
|
|
}
|
|
|
|
]?
|
|
{ check_for_void(*plp);
|
|
if (level == L_PROTO)
|
|
level = save_level;
|
|
else level++;
|
|
}
|
|
;
|
|
|
|
parameter_decl_list(struct proto **plp;)
|
|
:
|
|
parameter_decl(plp)
|
|
[ %while (AHEAD != ELLIPSIS)
|
|
%persistent
|
|
',' parameter_decl(plp)
|
|
]*
|
|
;
|
|
|
|
parameter_decl(struct proto **plp;)
|
|
{ register struct proto *new = new_proto();
|
|
struct declarator Dc;
|
|
struct decspecs Ds;
|
|
}
|
|
:
|
|
{ Dc = null_declarator;
|
|
Ds = null_decspecs;
|
|
}
|
|
decl_specifiers(&Ds)
|
|
parameter_declarator(&Dc)
|
|
{ add_proto(new, &Ds, &Dc, level);
|
|
new->next = *plp;
|
|
*plp = new;
|
|
remove_declarator(&Dc);
|
|
}
|
|
;
|
|
|
|
/* This is weird. Due to the LR structure of the ANSI C grammar
|
|
we have to duplicate the actions of 'declarator' and
|
|
'abstract_declarator'. Calling these separately, as in
|
|
|
|
parameter_decl:
|
|
decl_specifiers
|
|
[
|
|
declarator
|
|
|
|
|
abstract_declarator
|
|
]
|
|
|
|
|
|
gives us a conflict on the terminals '(' and '*'. E.i. on
|
|
some input, it is impossible to decide which rule we take.
|
|
Combining the two declarators into one common declarator
|
|
is out of the question, since this results in an empty
|
|
string for the non-terminal 'declarator'.
|
|
So we combine the two only for the use of parameter_decl,
|
|
since this is the only place where they don't give
|
|
conflicts. However, this makes the grammar messy.
|
|
*/
|
|
parameter_declarator(register struct declarator *dc;)
|
|
{ struct formal *fm = NO_PARAMS;
|
|
struct proto *pl = NO_PROTO;
|
|
arith count;
|
|
int qual;
|
|
}
|
|
:
|
|
primary_parameter_declarator(dc)
|
|
[
|
|
'('
|
|
[ %if (DOT != IDENTIFIER)
|
|
parameter_type_list(&pl)
|
|
|
|
|
formal_list(&fm)
|
|
|
|
|
/* empty */
|
|
]
|
|
')'
|
|
{ add_decl_unary(dc, FUNCTION, 0, (arith)0, fm, pl);
|
|
reject_params(dc);
|
|
}
|
|
|
|
|
arrayer(&count)
|
|
{add_decl_unary(dc, ARRAY, 0, count, NO_PARAMS, NO_PROTO);}
|
|
]*
|
|
|
|
|
pointer(&qual) parameter_declarator(dc)
|
|
{add_decl_unary(dc, POINTER, qual, (arith)0, NO_PARAMS, NO_PROTO);}
|
|
;
|
|
|
|
primary_parameter_declarator(register struct declarator *dc;)
|
|
:
|
|
[%if (AHEAD == ')' || first_of_parameter_type_list(AHEAD)
|
|
&& (AHEAD != IDENTIFIER))
|
|
/* empty */
|
|
|
|
|
identifier(&dc->dc_idf)
|
|
|
|
|
'(' parameter_declarator(dc) ')'
|
|
]
|
|
;
|
|
|
|
pointer(int *qual;)
|
|
:
|
|
'*' type_qualifier_list(qual)
|
|
;
|
|
|
|
/* Type qualifiers may come in three flavours:
|
|
volatile, const, const volatile.
|
|
These all have different semantic properties:
|
|
|
|
volatile:
|
|
means that the object can be modified
|
|
without prior knowledge of the implementation.
|
|
|
|
const:
|
|
means that the object can not be modified; thus
|
|
it's illegal to use this as a l-value.
|
|
|
|
const volatile:
|
|
means that the object can be modified without
|
|
prior knowledge of the implementation, but may
|
|
not be used as a l-value.
|
|
*/
|
|
/* 3.5.4 */
|
|
type_qualifier_list(int *qual;)
|
|
:
|
|
{ *qual = 0; }
|
|
[
|
|
VOLATILE
|
|
{ if (*qual & TQ_VOLATILE)
|
|
error("repeated type qualifier");
|
|
*qual |= TQ_VOLATILE;
|
|
}
|
|
|
|
|
CONST
|
|
{ if (*qual & TQ_CONST)
|
|
error("repeated type qualifier");
|
|
*qual |= TQ_CONST;
|
|
}
|
|
]*
|
|
;
|
|
|
|
empty:
|
|
;
|