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Text File | 1990-01-17 | 73.8 KB | 2,859 lines |
- /* YACC parser for C syntax.
- Copyright (C) 1987, 1988, 1989 Free Software Foundation, Inc.
-
- This file is part of GNU CC.
-
- GNU CC is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 1, or (at your option)
- any later version.
-
- GNU CC is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with GNU CC; see the file COPYING. If not, write to
- the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
-
- /* To whomever it may concern: I have heard that such a thing was once
- written by AT&T, but I have never seen it. */
-
- %expect 8
-
- /* These are the 8 conflicts you should get in parse.output;
- the state numbers may vary if minor changes in the grammar are made.
-
- State 41 contains 1 shift/reduce conflict. (Two ways to recover from error.)
- State 92 contains 1 shift/reduce conflict. (Two ways to recover from error.)
- State 99 contains 1 shift/reduce conflict. (Two ways to recover from error.)
- State 103 contains 1 shift/reduce conflict. (Two ways to recover from error.)
- State 119 contains 1 shift/reduce conflict. (See comment at component_decl.)
- State 183 contains 1 shift/reduce conflict. (Two ways to recover from error.)
- State 193 contains 1 shift/reduce conflict. (Two ways to recover from error.)
- State 199 contains 1 shift/reduce conflict. (Two ways to recover from error.)
- */
-
- %{
- #include "config.h"
- #include "tree.h"
- #include "input.h"
- #include "c-parse.h"
- #include "c-tree.h"
-
- #include <stdio.h>
- #include <errno.h>
-
- #ifndef errno
- extern int errno;
- #endif
-
- void yyerror ();
-
- /* Cause the `yydebug' variable to be defined. */
- #define YYDEBUG 1
- %}
-
- %start program
-
- %union {long itype; tree ttype; enum tree_code code; }
-
- /* All identifiers that are not reserved words
- and are not declared typedefs in the current block */
- %token IDENTIFIER
-
- /* All identifiers that are declared typedefs in the current block.
- In some contexts, they are treated just like IDENTIFIER,
- but they can also serve as typespecs in declarations. */
- %token TYPENAME
-
- /* Reserved words that specify storage class.
- yylval contains an IDENTIFIER_NODE which indicates which one. */
- %token SCSPEC
-
- /* Reserved words that specify type.
- yylval contains an IDENTIFIER_NODE which indicates which one. */
- %token TYPESPEC
-
- /* Reserved words that qualify type: "const" or "volatile".
- yylval contains an IDENTIFIER_NODE which indicates which one. */
- %token TYPE_QUAL
-
- /* Character or numeric constants.
- yylval is the node for the constant. */
- %token CONSTANT
-
- /* String constants in raw form.
- yylval is a STRING_CST node. */
- %token STRING
-
- /* "...", used for functions with variable arglists. */
- %token ELLIPSIS
-
- /* the reserved words */
- %token SIZEOF ENUM STRUCT UNION IF ELSE WHILE DO FOR SWITCH CASE DEFAULT
- %token BREAK CONTINUE RETURN GOTO ASM TYPEOF ALIGNOF
- %token ATTRIBUTE
-
- /* Add precedence rules to solve dangling else s/r conflict */
- %nonassoc IF
- %nonassoc ELSE
-
- /* Define the operator tokens and their precedences.
- The value is an integer because, if used, it is the tree code
- to use in the expression made from the operator. */
-
- %right <code> ASSIGN '='
- %right <code> '?' ':'
- %left <code> OROR
- %left <code> ANDAND
- %left <code> '|'
- %left <code> '^'
- %left <code> '&'
- %left <code> EQCOMPARE
- %left <code> ARITHCOMPARE
- %left <code> LSHIFT RSHIFT
- %left <code> '+' '-'
- %left <code> '*' '/' '%'
- %right <code> UNARY PLUSPLUS MINUSMINUS
- %left HYPERUNARY
- %left <code> POINTSAT '.' '(' '['
-
- %type <code> unop
-
- %type <ttype> identifier IDENTIFIER TYPENAME CONSTANT expr nonnull_exprlist exprlist
- %type <ttype> expr_no_commas cast_expr unary_expr primary string STRING
- %type <ttype> typed_declspecs reserved_declspecs
- %type <ttype> typed_typespecs reserved_typespecquals
- %type <ttype> declmods typespec typespecqual_reserved
- %type <ttype> SCSPEC TYPESPEC TYPE_QUAL nonempty_type_quals maybe_type_qual
- %type <ttype> initdecls notype_initdecls initdcl notype_initdcl
- %type <ttype> init initlist maybeasm
- %type <ttype> asm_operands nonnull_asm_operands asm_operand asm_clobbers
- %type <ttype> maybe_attribute attribute_list attrib
-
- %type <ttype> compstmt
-
- %type <ttype> declarator
- %type <ttype> notype_declarator after_type_declarator
- %type <ttype> parm_declarator
-
- %type <ttype> structsp component_decl_list component_decl components component_declarator
- %type <ttype> enumlist enumerator
- %type <ttype> typename absdcl absdcl1 type_quals
- %type <ttype> xexpr parms parm identifiers
-
- %type <ttype> parmlist parmlist_1 parmlist_2
- %type <ttype> parmlist_or_identifiers parmlist_or_identifiers_1
-
- %type <itype> setspecs
-
- %{
- /* the declaration found for the last IDENTIFIER token read in.
- yylex must look this up to detect typedefs, which get token type TYPENAME,
- so it is left around in case the identifier is not a typedef but is
- used in a context which makes it a reference to a variable. */
- static tree lastiddecl;
-
- static tree make_pointer_declarator ();
- static tree combine_strings ();
- static void reinit_parse_for_function ();
-
- /* List of types and structure classes of the current declaration. */
- tree current_declspecs;
-
- /* Stack of saved values of current_declspecs. */
- tree declspec_stack;
-
- int undeclared_variable_notice; /* 1 if we explained undeclared var errors. */
-
- static int yylex ();
- %}
-
- %%
- program: /* empty */
- | extdefs
- ;
-
- /* the reason for the strange actions in this rule
- is so that notype_initdecls when reached via datadef
- can find a valid list of type and sc specs in $0. */
-
- extdefs:
- {$<ttype>$ = NULL_TREE; } extdef
- | extdefs {$<ttype>$ = NULL_TREE; } extdef
- ;
-
- extdef:
- fndef
- | datadef
- | ASM '(' string ')' ';'
- { if (pedantic)
- warning ("ANSI C forbids use of `asm' keyword");
- if (TREE_CHAIN ($3)) $3 = combine_strings ($3);
- assemble_asm ($3); }
- ;
-
- datadef:
- setspecs notype_initdecls ';'
- { if (pedantic)
- error ("ANSI C forbids data definition lacking type or storage class");
- else if (!flag_traditional)
- warning ("data definition lacks type or storage class"); }
- | declmods setspecs notype_initdecls ';'
- {}
- | typed_declspecs setspecs initdecls ';'
- {}
- | declmods ';'
- { error ("empty declaration"); }
- | typed_declspecs ';'
- { shadow_tag ($1); }
- | error ';'
- | error '}'
- | ';'
- { if (pedantic)
- warning ("ANSI C does not allow extra `;' outside of a function"); }
- ;
-
- fndef:
- typed_declspecs setspecs declarator
- { if (! start_function ($1, $3))
- YYERROR;
- reinit_parse_for_function (); }
- xdecls
- { store_parm_decls (); }
- compstmt_or_error
- { finish_function (lineno); }
- | typed_declspecs setspecs declarator error
- { }
- | declmods setspecs notype_declarator
- { if (! start_function ($1, $3))
- YYERROR;
- reinit_parse_for_function (); }
- xdecls
- { store_parm_decls (); }
- compstmt_or_error
- { finish_function (lineno); }
- | declmods setspecs notype_declarator error
- { }
- | setspecs notype_declarator
- { if (! start_function (0, $2))
- YYERROR;
- reinit_parse_for_function (); }
- xdecls
- { store_parm_decls (); }
- compstmt_or_error
- { finish_function (lineno); }
- | setspecs notype_declarator error
- { }
- ;
-
- identifier:
- IDENTIFIER
- | TYPENAME
- ;
-
- unop: '&'
- { $$ = ADDR_EXPR; }
- | '-'
- { $$ = NEGATE_EXPR; }
- | '+'
- { $$ = CONVERT_EXPR; }
- | PLUSPLUS
- { $$ = PREINCREMENT_EXPR; }
- | MINUSMINUS
- { $$ = PREDECREMENT_EXPR; }
- | '~'
- { $$ = BIT_NOT_EXPR; }
- | '!'
- { $$ = TRUTH_NOT_EXPR; }
- ;
-
- expr: nonnull_exprlist
- { $$ = build_compound_expr ($1); }
- ;
-
- exprlist:
- /* empty */
- { $$ = NULL_TREE; }
- | nonnull_exprlist
- ;
-
- nonnull_exprlist:
- expr_no_commas
- { $$ = build_tree_list (NULL_TREE, $1); }
- | nonnull_exprlist ',' expr_no_commas
- { chainon ($1, build_tree_list (NULL_TREE, $3)); }
- ;
-
- unary_expr:
- primary
- | '*' cast_expr %prec UNARY
- { $$ = build_indirect_ref ($2, "unary *"); }
- | unop cast_expr %prec UNARY
- { $$ = build_unary_op ($1, $2, 0); }
- | SIZEOF unary_expr %prec UNARY
- { if (TREE_CODE ($2) == COMPONENT_REF
- && TREE_PACKED (TREE_OPERAND ($2, 1)))
- error ("`sizeof' applied to a bit-field");
- /* ANSI says arrays and functions are converted inside comma.
- But we can't really convert them in build_compound_expr
- because that would break commas in lvalues.
- So do the conversion here if operand was a comma. */
- if (TREE_CODE ($2) == COMPOUND_EXPR
- && (TREE_CODE (TREE_TYPE ($2)) == ARRAY_TYPE
- || TREE_CODE (TREE_TYPE ($2)) == FUNCTION_TYPE))
- $2 = default_conversion ($2);
- $$ = c_sizeof (TREE_TYPE ($2)); }
- | SIZEOF '(' typename ')' %prec HYPERUNARY
- { $$ = c_sizeof (groktypename ($3)); }
- | ALIGNOF unary_expr %prec UNARY
- { if (TREE_CODE ($2) == COMPONENT_REF
- && TREE_PACKED (TREE_OPERAND ($2, 1)))
- error ("`__alignof' applied to a bit-field");
- if (TREE_CODE ($2) == INDIRECT_REF)
- {
- tree t = TREE_OPERAND ($2, 0);
- tree best = t;
- int bestalign = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t)));
- while (TREE_CODE (t) == NOP_EXPR
- && TREE_CODE (TREE_TYPE (TREE_OPERAND (t, 0))) == POINTER_TYPE)
- {
- int thisalign;
- t = TREE_OPERAND (t, 0);
- thisalign = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (t)));
- if (thisalign > bestalign)
- best = t, bestalign = thisalign;
- }
- $$ = c_alignof (TREE_TYPE (TREE_TYPE (best)));
- }
- else
- {
- /* ANSI says arrays and fns are converted inside comma.
- But we can't convert them in build_compound_expr
- because that would break commas in lvalues.
- So do the conversion here if operand was a comma. */
- if (TREE_CODE ($2) == COMPOUND_EXPR
- && (TREE_CODE (TREE_TYPE ($2)) == ARRAY_TYPE
- || TREE_CODE (TREE_TYPE ($2)) == FUNCTION_TYPE))
- $2 = default_conversion ($2);
- $$ = c_alignof (TREE_TYPE ($2));
- }
- }
- | ALIGNOF '(' typename ')' %prec HYPERUNARY
- { $$ = c_alignof (groktypename ($3)); }
- ;
-
- cast_expr:
- unary_expr
- | '(' typename ')' cast_expr %prec UNARY
- { tree type = groktypename ($2);
- $$ = build_c_cast (type, $4); }
- | '(' typename ')' '{' initlist maybecomma '}' %prec UNARY
- { tree type = groktypename ($2);
- if (pedantic)
- warning ("ANSI C forbids constructor expressions");
- $$ = digest_init (type, build_nt (CONSTRUCTOR, NULL_TREE, nreverse ($5)), 0);
- if (TREE_CODE (type) == ARRAY_TYPE && TYPE_SIZE (type) == 0)
- {
- int failure = complete_array_type (type, $$, 1);
- if (failure)
- abort ();
- }
- }
- ;
-
- expr_no_commas:
- cast_expr
- | expr_no_commas '+' expr_no_commas
- { $$ = build_binary_op ($2, $1, $3); }
- | expr_no_commas '-' expr_no_commas
- { $$ = build_binary_op ($2, $1, $3); }
- | expr_no_commas '*' expr_no_commas
- { $$ = build_binary_op ($2, $1, $3); }
- | expr_no_commas '/' expr_no_commas
- { $$ = build_binary_op ($2, $1, $3); }
- | expr_no_commas '%' expr_no_commas
- { $$ = build_binary_op ($2, $1, $3); }
- | expr_no_commas LSHIFT expr_no_commas
- { $$ = build_binary_op ($2, $1, $3); }
- | expr_no_commas RSHIFT expr_no_commas
- { $$ = build_binary_op ($2, $1, $3); }
- | expr_no_commas ARITHCOMPARE expr_no_commas
- { $$ = build_binary_op ($2, $1, $3); }
- | expr_no_commas EQCOMPARE expr_no_commas
- { $$ = build_binary_op ($2, $1, $3); }
- | expr_no_commas '&' expr_no_commas
- { $$ = build_binary_op ($2, $1, $3); }
- | expr_no_commas '|' expr_no_commas
- { $$ = build_binary_op ($2, $1, $3); }
- | expr_no_commas '^' expr_no_commas
- { $$ = build_binary_op ($2, $1, $3); }
- | expr_no_commas ANDAND expr_no_commas
- { $$ = build_binary_op (TRUTH_ANDIF_EXPR, $1, $3); }
- | expr_no_commas OROR expr_no_commas
- { $$ = build_binary_op (TRUTH_ORIF_EXPR, $1, $3); }
- | expr_no_commas '?' xexpr ':' expr_no_commas
- { $$ = build_conditional_expr ($1, $3, $5); }
- | expr_no_commas '=' expr_no_commas
- { $$ = build_modify_expr ($1, NOP_EXPR, $3); }
- | expr_no_commas ASSIGN expr_no_commas
- { $$ = build_modify_expr ($1, $2, $3); }
- ;
-
- primary:
- IDENTIFIER
- { $$ = lastiddecl;
- if (!$$ || $$ == error_mark_node)
- {
- if (yychar == YYEMPTY)
- yychar = YYLEX;
- if (yychar == '(')
- {
- $$ = implicitly_declare ($1);
- assemble_external ($$);
- TREE_USED ($$) = 1;
- }
- else if (current_function_decl == 0)
- {
- error ("`%s' undeclared, outside of functions",
- IDENTIFIER_POINTER ($1));
- $$ = error_mark_node;
- }
- else
- {
- if (IDENTIFIER_GLOBAL_VALUE ($1) != error_mark_node
- || IDENTIFIER_ERROR_LOCUS ($1) != current_function_decl)
- {
- error ("`%s' undeclared (first use this function)",
- IDENTIFIER_POINTER ($1));
-
- if (! undeclared_variable_notice)
- {
- error ("(Each undeclared identifier is reported only once");
- error ("for each function it appears in.)");
- undeclared_variable_notice = 1;
- }
- }
- $$ = error_mark_node;
- /* Prevent repeated error messages. */
- IDENTIFIER_GLOBAL_VALUE ($1) = error_mark_node;
- IDENTIFIER_ERROR_LOCUS ($1) = current_function_decl;
- }
- }
- else if (! TREE_USED ($$))
- {
- if (TREE_EXTERNAL ($$))
- assemble_external ($$);
- TREE_USED ($$) = 1;
- }
- if (TREE_CODE ($$) == CONST_DECL)
- $$ = DECL_INITIAL ($$);
- }
- | CONSTANT
- | string
- { $$ = combine_strings ($1); }
- | '(' expr ')'
- { $$ = $2; }
- | '(' error ')'
- { $$ = error_mark_node; }
- | '('
- { if (current_function_decl == 0)
- {
- error ("braced-group within expression allowed only inside a function");
- YYERROR;
- }
- keep_next_level ();
- $<ttype>$ = expand_start_stmt_expr (); }
- compstmt ')'
- { tree rtl_exp;
- if (pedantic)
- warning ("ANSI C forbids braced-groups within expressions");
- rtl_exp = expand_end_stmt_expr ($<ttype>2);
- $$ = $3;
- TREE_USED ($$) = 0;
- /* Since the statements have side effects,
- consider this volatile. */
- TREE_VOLATILE ($$) = 1;
- TREE_TYPE ($$) = TREE_TYPE (rtl_exp);
- STMT_BODY ($$) = rtl_exp; }
- | primary '(' exprlist ')' %prec '.'
- { $$ = build_function_call ($1, $3); }
- | primary '[' expr ']' %prec '.'
- { $$ = build_array_ref ($1, $3); }
- | primary '.' identifier
- { $$ = build_component_ref ($1, $3); }
- | primary POINTSAT identifier
- { $$ = build_component_ref (build_indirect_ref ($1, "->"), $3); }
- | primary PLUSPLUS
- { $$ = build_unary_op (POSTINCREMENT_EXPR, $1, 0); }
- | primary MINUSMINUS
- { $$ = build_unary_op (POSTDECREMENT_EXPR, $1, 0); }
- ;
-
- /* Produces a STRING_CST with perhaps more STRING_CSTs chained onto it. */
- string:
- STRING
- | string STRING
- { $$ = chainon ($1, $2); }
- ;
-
- xdecls:
- /* empty */
- | decls
- ;
-
- decls:
- decl
- | errstmt
- | decls decl
- | decl errstmt
- ;
-
- /* records the type and storage class specs to use for processing
- the declarators that follow.
- Maintains a stack of outer-level values of current_declspecs,
- for the sake of parm declarations nested in function declarators. */
- setspecs: /* empty */
- { $$ = suspend_momentary ();
- declspec_stack = tree_cons (0, current_declspecs,
- declspec_stack);
- current_declspecs = $<ttype>0; }
- ;
-
- decl:
- typed_declspecs setspecs initdecls ';'
- { current_declspecs = TREE_VALUE (declspec_stack);
- declspec_stack = TREE_CHAIN (declspec_stack);
- resume_momentary ($2); }
- | declmods setspecs notype_initdecls ';'
- { current_declspecs = TREE_VALUE (declspec_stack);
- declspec_stack = TREE_CHAIN (declspec_stack);
- resume_momentary ($2); }
- | typed_declspecs ';'
- { shadow_tag ($1); }
- | declmods ';'
- { warning ("empty declaration"); }
- ;
-
- /* Declspecs which contain at least one type specifier or typedef name.
- (Just `const' or `volatile' is not enough.)
- A typedef'd name following these is taken as a name to be declared. */
-
- typed_declspecs:
- typespec reserved_declspecs
- { $$ = tree_cons (NULL_TREE, $1, $2); }
- | declmods typespec reserved_declspecs
- { $$ = chainon ($3, tree_cons (NULL_TREE, $2, $1)); }
- ;
-
- reserved_declspecs: /* empty */
- { $$ = NULL_TREE; }
- | reserved_declspecs typespecqual_reserved
- { $$ = tree_cons (NULL_TREE, $2, $1); }
- | reserved_declspecs SCSPEC
- { $$ = tree_cons (NULL_TREE, $2, $1); }
- ;
-
- /* List of just storage classes and type modifiers.
- A declaration can start with just this, but then it cannot be used
- to redeclare a typedef-name. */
-
- declmods:
- TYPE_QUAL
- { $$ = tree_cons (NULL_TREE, $1, NULL_TREE); }
- | SCSPEC
- { $$ = tree_cons (NULL_TREE, $1, NULL_TREE); }
- | declmods TYPE_QUAL
- { $$ = tree_cons (NULL_TREE, $2, $1); }
- | declmods SCSPEC
- { $$ = tree_cons (NULL_TREE, $2, $1); }
- ;
-
-
- /* Used instead of declspecs where storage classes are not allowed
- (that is, for typenames and structure components).
- Don't accept a typedef-name if anything but a modifier precedes it. */
-
- typed_typespecs:
- typespec reserved_typespecquals
- { $$ = tree_cons (NULL_TREE, $1, $2); }
- | nonempty_type_quals typespec reserved_typespecquals
- { $$ = chainon ($3, tree_cons (NULL_TREE, $2, $1)); }
- ;
-
- reserved_typespecquals: /* empty */
- { $$ = NULL_TREE; }
- | reserved_typespecquals typespecqual_reserved
- { $$ = tree_cons (NULL_TREE, $2, $1); }
- ;
-
- /* A typespec (but not a type qualifier).
- Once we have seen one of these in a declaration,
- if a typedef name appears then it is being redeclared. */
-
- typespec: TYPESPEC
- | structsp
- | TYPENAME
- | TYPEOF '(' expr ')'
- { $$ = TREE_TYPE ($3);
- if (pedantic)
- warning ("ANSI C forbids `typeof'"); }
- | TYPEOF '(' typename ')'
- { $$ = groktypename ($3);
- if (pedantic)
- warning ("ANSI C forbids `typeof'"); }
- ;
-
- /* A typespec that is a reserved word, or a type qualifier. */
-
- typespecqual_reserved: TYPESPEC
- | TYPE_QUAL
- | structsp
- ;
-
- initdecls:
- initdcl
- | initdecls ',' initdcl
- ;
-
- notype_initdecls:
- notype_initdcl
- | notype_initdecls ',' initdcl
- ;
-
- maybeasm:
- /* empty */
- { $$ = NULL_TREE; }
- | ASM '(' string ')'
- { if (TREE_CHAIN ($3)) $3 = combine_strings ($3);
- $$ = $3;
- if (pedantic)
- warning ("ANSI C forbids use of `asm' keyword");
- }
- ;
-
- initdcl:
- declarator maybeasm maybe_attribute '='
- { $<ttype>$ = start_decl ($1, current_declspecs, 1); }
- init
- /* Note how the declaration of the variable is in effect while its init is parsed! */
- { finish_decl ($<ttype>5, $6, $2); }
- | declarator maybeasm maybe_attribute
- { tree d = start_decl ($1, current_declspecs, 0);
- finish_decl (d, NULL_TREE, $2); }
- ;
-
- notype_initdcl:
- notype_declarator maybeasm maybe_attribute '='
- { $<ttype>$ = start_decl ($1, current_declspecs, 1); }
- init
- /* Note how the declaration of the variable is in effect while its init is parsed! */
- { finish_decl ($<ttype>5, $6, $2); }
- | notype_declarator maybeasm maybe_attribute
- { tree d = start_decl ($1, current_declspecs, 0);
- finish_decl (d, NULL_TREE, $2); }
- ;
- /* the * rules are dummies to accept the Apollo extended syntax
- so that the header files compile. */
- maybe_attribute:
- /* empty */
- { $$ = NULL_TREE; }
- | ATTRIBUTE '(' '(' attribute_list ')' ')'
- { $$ = $4; }
- ;
-
- attribute_list
- : attrib
- | attribute_list ',' attrib
- ;
-
- attrib
- : IDENTIFIER
- { warning ("`%s' attribute directive ignored",
- IDENTIFIER_POINTER ($1));
- $$ = $1; }
- | IDENTIFIER '(' CONSTANT ')'
- { /* if not "aligned(1)", then issue warning */
- if (strcmp (IDENTIFIER_POINTER ($1), "aligned") != 0
- || TREE_CODE ($3) != INTEGER_CST
- || TREE_INT_CST_LOW ($3) != 1)
- warning ("`%s' attribute directive ignored",
- IDENTIFIER_POINTER ($1));
- $$ = $1; }
- | IDENTIFIER '(' identifiers ')'
- { warning ("`%s' attribute directive ignored",
- IDENTIFIER_POINTER ($1));
- $$ = $1; }
- ;
-
- init:
- expr_no_commas
- | '{' '}'
- { $$ = build_nt (CONSTRUCTOR, NULL_TREE, NULL_TREE);
- if (pedantic)
- warning ("ANSI C forbids empty initializer braces"); }
- | '{' initlist '}'
- { $$ = build_nt (CONSTRUCTOR, NULL_TREE, nreverse ($2)); }
- | '{' initlist ',' '}'
- { $$ = build_nt (CONSTRUCTOR, NULL_TREE, nreverse ($2)); }
- | error
- { $$ = NULL_TREE; }
- ;
-
- /* This chain is built in reverse order,
- and put in forward order where initlist is used. */
- initlist:
- init
- { $$ = build_tree_list (NULL_TREE, $1); }
- | initlist ',' init
- { $$ = tree_cons (NULL_TREE, $3, $1); }
- ;
-
- /* Any kind of declarator (thus, all declarators allowed
- after an explicit typespec). */
-
- declarator:
- after_type_declarator
- | notype_declarator
- ;
-
- /* A declarator that is allowed only after an explicit typespec. */
-
- after_type_declarator:
- '(' after_type_declarator ')'
- { $$ = $2; }
- | after_type_declarator '(' parmlist_or_identifiers %prec '.'
- { $$ = build_nt (CALL_EXPR, $1, $3, NULL_TREE); }
- /* | after_type_declarator '(' error ')' %prec '.'
- { $$ = build_nt (CALL_EXPR, $1, NULL_TREE, NULL_TREE);
- poplevel (0, 0, 0); } */
- | after_type_declarator '[' expr ']' %prec '.'
- { $$ = build_nt (ARRAY_REF, $1, $3); }
- | after_type_declarator '[' ']' %prec '.'
- { $$ = build_nt (ARRAY_REF, $1, NULL_TREE); }
- | '*' type_quals after_type_declarator %prec UNARY
- { $$ = make_pointer_declarator ($2, $3); }
- | TYPENAME
- ;
-
- /* Kinds of declarator that can appear in a parameter list
- in addition to notype_declarator. This is like after_type_declarator
- but does not allow a typedef name in parentheses as an identifier
- (because it would conflict with a function with that typedef as arg). */
-
- parm_declarator:
- parm_declarator '(' parmlist_or_identifiers %prec '.'
- { $$ = build_nt (CALL_EXPR, $1, $3, NULL_TREE); }
- /* | parm_declarator '(' error ')' %prec '.'
- { $$ = build_nt (CALL_EXPR, $1, NULL_TREE, NULL_TREE);
- poplevel (0, 0, 0); } */
- | parm_declarator '[' expr ']' %prec '.'
- { $$ = build_nt (ARRAY_REF, $1, $3); }
- | parm_declarator '[' ']' %prec '.'
- { $$ = build_nt (ARRAY_REF, $1, NULL_TREE); }
- | '*' type_quals parm_declarator %prec UNARY
- { $$ = make_pointer_declarator ($2, $3); }
- | TYPENAME
- ;
-
- /* A declarator allowed whether or not there has been
- an explicit typespec. These cannot redeclare a typedef-name. */
-
- notype_declarator:
- notype_declarator '(' parmlist_or_identifiers %prec '.'
- { $$ = build_nt (CALL_EXPR, $1, $3, NULL_TREE); }
- /* | notype_declarator '(' error ')' %prec '.'
- { $$ = build_nt (CALL_EXPR, $1, NULL_TREE, NULL_TREE);
- poplevel (0, 0, 0); } */
- | '(' notype_declarator ')'
- { $$ = $2; }
- | '*' type_quals notype_declarator %prec UNARY
- { $$ = make_pointer_declarator ($2, $3); }
- | notype_declarator '[' expr ']' %prec '.'
- { $$ = build_nt (ARRAY_REF, $1, $3); }
- | notype_declarator '[' ']' %prec '.'
- { $$ = build_nt (ARRAY_REF, $1, NULL_TREE); }
- | IDENTIFIER
- ;
-
- structsp:
- STRUCT identifier '{'
- { $$ = start_struct (RECORD_TYPE, $2);
- /* Start scope of tag before parsing components. */
- }
- component_decl_list '}'
- { $$ = finish_struct ($<ttype>4, $5);
- /* Really define the structure. */
- }
- | STRUCT '{' component_decl_list '}'
- { $$ = finish_struct (start_struct (RECORD_TYPE, NULL_TREE),
- $3); }
- | STRUCT identifier
- { $$ = xref_tag (RECORD_TYPE, $2); }
- | UNION identifier '{'
- { $$ = start_struct (UNION_TYPE, $2); }
- component_decl_list '}'
- { $$ = finish_struct ($<ttype>4, $5); }
- | UNION '{' component_decl_list '}'
- { $$ = finish_struct (start_struct (UNION_TYPE, NULL_TREE),
- $3); }
- | UNION identifier
- { $$ = xref_tag (UNION_TYPE, $2); }
- | ENUM identifier '{'
- { $<itype>3 = suspend_momentary ();
- $$ = start_enum ($2); }
- enumlist maybecomma_warn '}'
- { $$ = finish_enum ($<ttype>4, nreverse ($5));
- resume_momentary ($<itype>3); }
- | ENUM '{'
- { $<itype>2 = suspend_momentary ();
- $$ = start_enum (NULL_TREE); }
- enumlist maybecomma_warn '}'
- { $$ = finish_enum ($<ttype>3, nreverse ($4));
- resume_momentary ($<itype>2); }
- | ENUM identifier
- { $$ = xref_tag (ENUMERAL_TYPE, $2); }
- ;
-
- maybecomma:
- /* empty */
- | ','
- ;
-
- maybecomma_warn:
- /* empty */
- | ','
- { if (pedantic) warning ("comma at end of enumerator list"); }
- ;
-
- component_decl_list: /* empty */
- { $$ = NULL_TREE; }
- | component_decl_list component_decl ';'
- { $$ = chainon ($1, $2); }
- | component_decl_list ';'
- { if (pedantic)
- warning ("extra semicolon in struct or union specified"); }
- ;
-
- /* There is a shift-reduce conflict here, because `components' may
- start with a `typename'. It happens that shifting (the default resolution)
- does the right thing, because it treats the `typename' as part of
- a `typed_typespecs'.
-
- It is possible that this same technique would allow the distinction
- between `notype_initdecls' and `initdecls' to be eliminated.
- But I am being cautious and not trying it. */
-
- component_decl:
- typed_typespecs setspecs components
- { $$ = $3;
- current_declspecs = TREE_VALUE (declspec_stack);
- declspec_stack = TREE_CHAIN (declspec_stack);
- resume_momentary ($2); }
- | nonempty_type_quals setspecs components
- { $$ = $3;
- current_declspecs = TREE_VALUE (declspec_stack);
- declspec_stack = TREE_CHAIN (declspec_stack);
- resume_momentary ($2); }
- | error
- { $$ = NULL_TREE; }
- ;
-
- components:
- /* empty */
- { if (pedantic)
- warning ("ANSI C forbids member declarations with no members");
- $$ = NULL_TREE; }
- | component_declarator
- | components ',' component_declarator
- { $$ = chainon ($1, $3); }
- ;
-
- component_declarator:
- declarator maybe_attribute
- { $$ = grokfield (input_filename, lineno, $1, current_declspecs, NULL_TREE); }
- | declarator ':' expr_no_commas maybe_attribute
- { $$ = grokfield (input_filename, lineno, $1, current_declspecs, $3); }
- | ':' expr_no_commas
- { $$ = grokfield (input_filename, lineno, NULL_TREE, current_declspecs, $2); }
- ;
-
- /* We chain the enumerators in reverse order.
- They are put in forward order where enumlist is used.
- (The order used to be significant, but no longer is so.
- However, we still maintain the order, just to be clean.) */
-
- enumlist:
- enumerator
- | enumlist ',' enumerator
- { $$ = chainon ($3, $1); }
- ;
-
-
- enumerator:
- identifier
- { $$ = build_enumerator ($1, NULL_TREE); }
- | identifier '=' expr_no_commas
- { $$ = build_enumerator ($1, $3); }
- ;
-
- typename:
- typed_typespecs absdcl
- { $$ = build_tree_list ($1, $2); }
- | nonempty_type_quals absdcl
- { $$ = build_tree_list ($1, $2); }
- ;
-
- absdcl: /* an absolute declarator */
- /* empty */
- { $$ = NULL_TREE; }
- | absdcl1
- ;
-
- nonempty_type_quals:
- TYPE_QUAL
- { $$ = tree_cons (NULL_TREE, $1, NULL_TREE); }
- | nonempty_type_quals TYPE_QUAL
- { $$ = tree_cons (NULL_TREE, $2, $1); }
- ;
-
- type_quals:
- /* empty */
- { $$ = NULL_TREE; }
- | type_quals TYPE_QUAL
- { $$ = tree_cons (NULL_TREE, $2, $1); }
- ;
-
- absdcl1: /* a nonempty absolute declarator */
- '(' absdcl1 ')'
- { $$ = $2; }
- /* `(typedef)1' is `int'. */
- | '*' type_quals absdcl1 %prec UNARY
- { $$ = make_pointer_declarator ($2, $3); }
- | '*' type_quals %prec UNARY
- { $$ = make_pointer_declarator ($2, NULL_TREE); }
- | absdcl1 '(' parmlist %prec '.'
- { $$ = build_nt (CALL_EXPR, $1, $3, NULL_TREE); }
- | absdcl1 '[' expr ']' %prec '.'
- { $$ = build_nt (ARRAY_REF, $1, $3); }
- | absdcl1 '[' ']' %prec '.'
- { $$ = build_nt (ARRAY_REF, $1, NULL_TREE); }
- | '(' parmlist %prec '.'
- { $$ = build_nt (CALL_EXPR, NULL_TREE, $2, NULL_TREE); }
- | '[' expr ']' %prec '.'
- { $$ = build_nt (ARRAY_REF, NULL_TREE, $2); }
- | '[' ']' %prec '.'
- { $$ = build_nt (ARRAY_REF, NULL_TREE, NULL_TREE); }
- ;
-
- /* at least one statement, the first of which parses without error. */
- /* stmts is used only after decls, so an invalid first statement
- is actually regarded as an invalid decl and part of the decls. */
-
- stmts:
- stmt
- | stmts stmt
- | stmts errstmt
- ;
-
- xstmts:
- /* empty */
- | stmts
- ;
-
- errstmt: error ';'
- ;
-
- pushlevel: /* empty */
- { pushlevel (0);
- clear_last_expr ();
- push_momentary ();
- expand_start_bindings (0); }
- ;
-
- /* This is the body of a function definition.
- It causes syntax errors to ignore to the next openbrace. */
- compstmt_or_error:
- compstmt
- {}
- | error compstmt
- ;
-
- compstmt: '{' '}'
- { $$ = 0; }
- | '{' pushlevel decls xstmts '}'
- { expand_end_bindings (getdecls (), 1, 0);
- $$ = poplevel (1, 1, 0);
- pop_momentary (); }
- | '{' pushlevel error '}'
- { expand_end_bindings (getdecls (), kept_level_p (), 0);
- $$ = poplevel (kept_level_p (), 0, 0);
- pop_momentary (); }
- | '{' pushlevel stmts '}'
- { expand_end_bindings (getdecls (), kept_level_p (), 0);
- $$ = poplevel (kept_level_p (), 0, 0);
- pop_momentary (); }
- ;
-
- simple_if:
- IF '(' expr ')'
- { emit_line_note (input_filename, lineno);
- expand_start_cond (truthvalue_conversion ($3), 0); }
- stmt
- ;
-
- stmt:
- compstmt {}
- | expr ';'
- { emit_line_note (input_filename, lineno);
- /* Do default conversion if safe and possibly important,
- in case within ({...}). */
- if ((TREE_CODE (TREE_TYPE ($1)) == ARRAY_TYPE
- && lvalue_p ($1))
- || TREE_CODE (TREE_TYPE ($1)) == FUNCTION_TYPE)
- $1 = default_conversion ($1);
- expand_expr_stmt ($1);
- clear_momentary (); }
- | simple_if ELSE
- { expand_start_else (); }
- stmt
- { expand_end_else (); }
- | simple_if %prec IF
- { expand_end_cond (); }
- | WHILE
- { emit_nop ();
- emit_line_note (input_filename, lineno);
- expand_start_loop (1); }
- '(' expr ')'
- { emit_line_note (input_filename, lineno);
- expand_exit_loop_if_false (truthvalue_conversion ($4)); }
- stmt
- { expand_end_loop (); }
- | DO
- { emit_nop ();
- emit_line_note (input_filename, lineno);
- expand_start_loop_continue_elsewhere (1); }
- stmt WHILE
- { expand_loop_continue_here (); }
- '(' expr ')' ';'
- { emit_line_note (input_filename, lineno);
- expand_exit_loop_if_false (truthvalue_conversion ($7));
- expand_end_loop ();
- clear_momentary (); }
- | FOR
- '(' xexpr ';'
- { emit_nop ();
- emit_line_note (input_filename, lineno);
- if ($3) expand_expr_stmt ($3);
- expand_start_loop_continue_elsewhere (1); }
- xexpr ';'
- { emit_line_note (input_filename, lineno);
- if ($6)
- expand_exit_loop_if_false (truthvalue_conversion ($6)); }
- xexpr ')'
- /* Don't let the tree nodes for $9 be discarded
- by clear_momentary during the parsing of the next stmt. */
- { push_momentary ();
- $<itype>10 = lineno; }
- stmt
- { emit_line_note (input_filename, $<itype>10);
- expand_loop_continue_here ();
- if ($9)
- expand_expr_stmt ($9);
- pop_momentary ();
- expand_end_loop (); }
- | SWITCH '(' expr ')'
- { emit_line_note (input_filename, lineno);
- c_expand_start_case ($3);
- /* Don't let the tree nodes for $3 be discarded by
- clear_momentary during the parsing of the next stmt. */
- push_momentary (); }
- stmt
- { expand_end_case ($3);
- pop_momentary (); }
- | CASE expr ':'
- { register tree value = fold ($2);
- register tree label
- = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
-
- /* build_c_cast puts on a NOP_EXPR to make a non-lvalue.
- Strip such NOP_EXPRs. */
- if (TREE_CODE (value) == NOP_EXPR
- && TREE_TYPE (value) == TREE_TYPE (TREE_OPERAND (value, 0)))
- value = TREE_OPERAND (value, 0);
-
- if (TREE_CODE (value) != INTEGER_CST
- && value != error_mark_node)
- {
- error ("case label does not reduce to an integer constant");
- value = error_mark_node;
- }
- else
- /* Promote char or short to int. */
- value = default_conversion (value);
- if (value != error_mark_node)
- {
- int success = pushcase (value, label);
- if (success == 1)
- error ("case label not within a switch statement");
- else if (success == 2)
- error ("duplicate case value");
- else if (success == 3)
- warning ("case value out of range");
- }
- }
- stmt
- | DEFAULT ':'
- {
- register tree label
- = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
- int success = pushcase (NULL_TREE, label);
- if (success == 1)
- error ("default label not within a switch statement");
- else if (success == 2)
- error ("multiple default labels in one switch");
- }
- stmt
- | BREAK ';'
- { emit_line_note (input_filename, lineno);
- if ( ! expand_exit_something ())
- error ("break statement not within loop or switch"); }
- | CONTINUE ';'
- { emit_line_note (input_filename, lineno);
- if (! expand_continue_loop ())
- error ("continue statement not within a loop"); }
- | RETURN ';'
- { emit_line_note (input_filename, lineno);
- c_expand_return (NULL_TREE); }
- | RETURN expr ';'
- { emit_line_note (input_filename, lineno);
- c_expand_return ($2); }
- | ASM maybe_type_qual '(' string ')' ';'
- { if (TREE_CHAIN ($4)) $4 = combine_strings ($4);
- emit_line_note (input_filename, lineno);
- expand_asm ($4); }
- /* This is the case with just output operands. */
- | ASM maybe_type_qual '(' string ':' asm_operands ')' ';'
- { if (TREE_CHAIN ($4)) $4 = combine_strings ($4);
- emit_line_note (input_filename, lineno);
- c_expand_asm_operands ($4, $6, NULL_TREE, NULL_TREE,
- $2 == ridpointers[(int)RID_VOLATILE],
- input_filename, lineno); }
- /* This is the case with input operands as well. */
- | ASM maybe_type_qual '(' string ':' asm_operands ':' asm_operands ')' ';'
- { if (TREE_CHAIN ($4)) $4 = combine_strings ($4);
- emit_line_note (input_filename, lineno);
- c_expand_asm_operands ($4, $6, $8, NULL_TREE,
- $2 == ridpointers[(int)RID_VOLATILE],
- input_filename, lineno); }
- /* This is the case with clobbered registers as well. */
- | ASM maybe_type_qual '(' string ':' asm_operands ':'
- asm_operands ':' asm_clobbers ')' ';'
- { if (TREE_CHAIN ($4)) $4 = combine_strings ($4);
- emit_line_note (input_filename, lineno);
- c_expand_asm_operands ($4, $6, $8, $10,
- $2 == ridpointers[(int)RID_VOLATILE],
- input_filename, lineno); }
- | GOTO identifier ';'
- { tree decl;
- emit_line_note (input_filename, lineno);
- decl = lookup_label ($2);
- TREE_USED (decl) = 1;
- expand_goto (decl); }
- | identifier ':'
- { tree label = define_label (input_filename, lineno, $1);
- emit_nop ();
- if (label)
- expand_label (label); }
- stmt
- | ';'
- ;
-
- /* Either a type-qualifier or nothing. First thing in an `asm' statement. */
-
- maybe_type_qual:
- /* empty */
- { if (pedantic)
- warning ("ANSI C forbids use of `asm' keyword");
- emit_line_note (input_filename, lineno); }
- | TYPE_QUAL
- { if (pedantic)
- warning ("ANSI C forbids use of `asm' keyword");
- emit_line_note (input_filename, lineno); }
- ;
-
- xexpr:
- /* empty */
- { $$ = NULL_TREE; }
- | expr
- ;
-
- /* These are the operands other than the first string and colon
- in asm ("addextend %2,%1": "=dm" (x), "0" (y), "g" (*x)) */
- asm_operands: /* empty */
- { $$ = NULL_TREE; }
- | nonnull_asm_operands
- ;
-
- nonnull_asm_operands:
- asm_operand
- | nonnull_asm_operands ',' asm_operand
- { $$ = chainon ($1, $3); }
- ;
-
- asm_operand:
- STRING '(' expr ')'
- { $$ = build_tree_list ($1, $3); }
- ;
-
- asm_clobbers:
- string
- { $$ = tree_cons (NULL_TREE, combine_strings ($1), NULL_TREE); }
- | asm_clobbers ',' string
- { $$ = tree_cons (NULL_TREE, combine_strings ($3), $1); }
- ;
-
- /* This is what appears inside the parens in a function declarator.
- Its value is a list of ..._TYPE nodes. */
- parmlist:
- { pushlevel (0);
- declare_parm_level (); }
- parmlist_1
- { $$ = $2;
- parmlist_tags_warning ();
- poplevel (0, 0, 0); }
- ;
-
- /* This is referred to where either a parmlist or an identifier list is ok.
- Its value is a list of ..._TYPE nodes or a list of identifiers. */
- parmlist_or_identifiers:
- { pushlevel (0);
- declare_parm_level (); }
- parmlist_or_identifiers_1
- { $$ = $2;
- parmlist_tags_warning ();
- poplevel (0, 0, 0); }
- ;
-
- parmlist_or_identifiers_1:
- parmlist_2 ')'
- | identifiers ')'
- { $$ = tree_cons (NULL_TREE, NULL_TREE, $1); }
- | error ')'
- { $$ = tree_cons (NULL_TREE, NULL_TREE, NULL_TREE); }
- ;
-
- parmlist_1:
- parmlist_2 ')'
- | error ')'
- { $$ = tree_cons (NULL_TREE, NULL_TREE, NULL_TREE); }
- ;
-
- /* This is what appears inside the parens in a function declarator.
- Is value is represented in the format that grokdeclarator expects. */
- parmlist_2: /* empty */
- { $$ = get_parm_info (0); }
- | parms
- { $$ = get_parm_info (1); }
- | parms ',' ELLIPSIS
- { $$ = get_parm_info (0); }
- ;
-
- parms:
- parm
- { push_parm_decl ($1); }
- | parms ',' parm
- { push_parm_decl ($3); }
- ;
-
- /* A single parameter declaration or parameter type name,
- as found in a parmlist. */
- parm:
- typed_declspecs parm_declarator
- { $$ = build_tree_list ($1, $2) ; }
- | typed_declspecs notype_declarator
- { $$ = build_tree_list ($1, $2) ; }
- | typed_declspecs absdcl
- { $$ = build_tree_list ($1, $2); }
- | declmods notype_declarator
- { $$ = build_tree_list ($1, $2) ; }
- | declmods absdcl
- { $$ = build_tree_list ($1, $2); }
- ;
-
- /* A nonempty list of identifiers. */
- identifiers:
- IDENTIFIER
- { $$ = build_tree_list (NULL_TREE, $1); }
- | identifiers ',' IDENTIFIER
- { $$ = chainon ($1, build_tree_list (NULL_TREE, $3)); }
- ;
- %%
-
- /* Return something to represent absolute declarators containing a *.
- TARGET is the absolute declarator that the * contains.
- TYPE_QUALS is a list of modifiers such as const or volatile
- to apply to the pointer type, represented as identifiers.
-
- We return an INDIRECT_REF whose "contents" are TARGET
- and whose type is the modifier list. */
-
- static tree
- make_pointer_declarator (type_quals, target)
- tree type_quals, target;
- {
- return build (INDIRECT_REF, type_quals, target);
- }
-
- /* Given a chain of STRING_CST nodes,
- concatenate them into one STRING_CST
- and give it a suitable array-of-chars data type. */
-
- static tree
- combine_strings (strings)
- tree strings;
- {
- register tree value, t;
- register int length = 1;
- int wide_length = 0;
- int wide_flag = 0;
-
- if (TREE_CHAIN (strings))
- {
- /* More than one in the chain, so concatenate. */
- register char *p, *q;
-
- /* Don't include the \0 at the end of each substring,
- except for the last one.
- Count wide strings and ordinary strings separately. */
- for (t = strings; t; t = TREE_CHAIN (t))
- {
- if (TREE_TYPE (t) == int_array_type_node)
- {
- wide_length += (TREE_STRING_LENGTH (t) - 1);
- wide_flag = 1;
- }
- else
- length += (TREE_STRING_LENGTH (t) - 1);
- }
-
- /* If anything is wide, the non-wides will be converted,
- which makes them take more space. */
- if (wide_flag)
- length = length * UNITS_PER_WORD + wide_length;
-
- p = (char *) savealloc (length);
-
- /* Copy the individual strings into the new combined string.
- If the combined string is wide, convert the chars to ints
- for any individual strings that are not wide. */
-
- q = p;
- for (t = strings; t; t = TREE_CHAIN (t))
- {
- int len = TREE_STRING_LENGTH (t) - 1;
- if ((TREE_TYPE (t) == int_array_type_node) == wide_flag)
- {
- bcopy (TREE_STRING_POINTER (t), q, len);
- q += len;
- }
- else
- {
- int i;
- for (i = 0; i < len; i++)
- ((int *) q)[i] = TREE_STRING_POINTER (t)[i];
- q += len * UNITS_PER_WORD;
- }
- }
- *q = 0;
-
- value = make_node (STRING_CST);
- TREE_STRING_POINTER (value) = p;
- TREE_STRING_LENGTH (value) = length;
- TREE_LITERAL (value) = 1;
- }
- else
- {
- value = strings;
- length = TREE_STRING_LENGTH (value);
- if (TREE_TYPE (value) == int_array_type_node)
- wide_flag = 1;
- }
-
- /* Create the array type for the string constant.
- -Wwrite-strings says make the string constant an array of const char
- so that copying it to a non-const pointer will get a warning. */
- if (warn_write_strings)
- {
- tree elements
- = build_type_variant (wide_flag ? integer_type_node : char_type_node,
- 1, 0);
- TREE_TYPE (value)
- = build_array_type (elements,
- build_index_type (build_int_2 (length - 1, 0)));
- }
- else
- TREE_TYPE (value)
- = build_array_type (wide_flag ? integer_type_node : char_type_node,
- build_index_type (build_int_2 (length - 1, 0)));
- TREE_LITERAL (value) = 1;
- TREE_STATIC (value) = 1;
- return value;
- }
-
- int lineno; /* current line number in file being read */
-
- FILE *finput; /* input file.
- Normally a pipe from the preprocessor. */
-
- /* lexical analyzer */
-
- static int maxtoken; /* Current nominal length of token buffer. */
- static char *token_buffer; /* Pointer to token buffer.
- Actual allocated length is maxtoken + 2. */
- static int max_wide; /* Current nominal length of wide_buffer. */
- static int *wide_buffer; /* Pointer to wide-string buffer.
- Actual allocated length is max_wide + 1. */
-
- /* Nonzero if end-of-file has been seen on input. */
- static int end_of_file;
-
- /* Data type that represents the GNU C reserved words. */
- struct resword { char *name; short token; enum rid rid; };
-
- #define MIN_WORD_LENGTH 2 /* minimum size for C keyword */
- #define MAX_WORD_LENGTH 13 /* maximum size for C keyword */
- #define MIN_HASH_VALUE 7 /* range of the hash keys values */
- #define MAX_HASH_VALUE 91 /* for the perfect hash generator */
- #define NORID RID_UNUSED
-
- /* This function performs the minimum-perfect hash mapping from input
- string to reswords table index. It only looks at the first and
- last characters in the string, thus assuring the O(1) lookup time
- (this keeps our constant down to an insignificant amount!). Compiling
- the following 2 functions as inline removes all overhead of the
- function calls. */
-
- #ifdef __GNUC__
- __inline
- #endif
- static int
- hash (str, len)
- register char *str;
- register int len;
- {
- /* This table is used to build the hash table index that recognizes
- reserved words in 0(1) steps. It is larger than strictly necessary,
- but I'm trading off the space for the time-saving luxury of avoiding
- subtraction of an offset. All those ``91's'' (actually just a
- short-hand for MAX_HASH_VALUE #defined above) are used to speed up
- the search when the string found on the input stream doesn't have a
- first or last character that is part of the set of alphabetic
- characters that comprise the first or last characters in C
- reserved words. */
-
- static int hash_table[] =
- {
- 91, 91, 91, 91, 91, 91, 91, 91, 91, 91,
- 91, 91, 91, 91, 91, 91, 91, 91, 91, 91,
- 91, 91, 91, 91, 91, 91, 91, 91, 91, 91,
- 91, 91, 91, 91, 91, 91, 91, 91, 91, 91,
- 91, 91, 91, 91, 91, 91, 91, 91, 91, 91,
- 91, 91, 91, 91, 91, 91, 91, 91, 91, 91,
- 91, 91, 91, 91, 91, 91, 91, 91, 91, 91,
- 91, 91, 91, 91, 91, 91, 91, 91, 91, 91,
- 91, 91, 91, 91, 91, 91, 91, 91, 91, 91,
- 91, 91, 91, 91, 91, 1, 91, 2, 1, 32,
- 7, 5, 18, 20, 1, 17, 91, 1, 18, 1,
- 28, 1, 23, 91, 12, 20, 1, 41, 7, 15,
- 91, 91, 10, 91, 91, 91, 91, 91,
- };
- register int hval = len ;
-
- switch (hval)
- {
- default:
- case 3:
- hval += hash_table[str[2]];
- case 2:
- case 1:
- return hval + hash_table[str[0]] + hash_table[str[len - 1]];
- }
- }
-
- /* This routine attempts to match the string found in the reswords table
- with the one from the input stream. If all the relevant details
- match then an actual strcmp comparison is performed and the address of
- correct struct resword entry is returned. Otherwise, a NULL
- pointer is returned. */
-
- #ifdef __GNUC__
- __inline
- #endif
- struct resword *
- is_reserved_word (str, len)
- register char *str;
- register int len;
- {
- /* This is the hash table of keywords.
- The order of keywords has been chosen for perfect hashing.
- Therefore, this table cannot be updated by hand.
- Use the program ``gperf,'' available with the latest libg++
- distribution, to generate an updated table. A file called
- c-parse.gperf, distributed with GNU C, contains the keyword file. */
-
- static struct resword reswords[] =
- {
- { "", }, { "", }, { "", }, { "", }, { "", }, { "", }, { "", },
- {"asm", ASM, NORID },
- {"auto", SCSPEC, RID_AUTO },
- {"__asm", ASM, NORID },
- {"do", DO, NORID },
- {"__asm__", ASM, NORID },
- {"break", BREAK, NORID },
- {"__typeof__", TYPEOF, NORID },
- { "", },
- {"__alignof__", ALIGNOF, NORID },
- { "", },
- {"__attribute__", ATTRIBUTE, NORID },
- { "", },
- {"__attribute", ATTRIBUTE, NORID },
- { "", },
- {"__volatile__", TYPE_QUAL, RID_VOLATILE },
- {"int", TYPESPEC, RID_INT },
- {"__volatile", TYPE_QUAL, RID_VOLATILE },
- { "", },
- {"float", TYPESPEC, RID_FLOAT },
- {"goto", GOTO, NORID },
- {"short", TYPESPEC, RID_SHORT },
- {"__typeof", TYPEOF, NORID },
- {"__inline__", SCSPEC, RID_INLINE },
- {"__alignof", ALIGNOF, NORID },
- {"__inline", SCSPEC, RID_INLINE },
- {"__signed__", TYPESPEC, RID_SIGNED },
- {"default", DEFAULT, NORID },
- {"else", ELSE, NORID },
- {"void", TYPESPEC, RID_VOID },
- {"__signed", TYPESPEC, RID_SIGNED },
- {"if", IF, NORID },
- {"volatile", TYPE_QUAL, RID_VOLATILE },
- {"struct", STRUCT, NORID },
- {"extern", SCSPEC, RID_EXTERN },
- {"__const", TYPE_QUAL, RID_CONST },
- {"while", WHILE, NORID },
- {"__const__", TYPE_QUAL, RID_CONST },
- {"switch", SWITCH, NORID },
- {"for", FOR, NORID },
- {"inline", SCSPEC, RID_INLINE },
- {"return", RETURN, NORID },
- {"typeof", TYPEOF, NORID },
- {"typedef", SCSPEC, RID_TYPEDEF },
- {"char", TYPESPEC, RID_CHAR },
- {"enum", ENUM, NORID },
- {"register", SCSPEC, RID_REGISTER },
- {"signed", TYPESPEC, RID_SIGNED },
- {"sizeof", SIZEOF, NORID },
- { "", }, { "", }, { "", }, { "", },
- {"double", TYPESPEC, RID_DOUBLE },
- {"static", SCSPEC, RID_STATIC },
- {"case", CASE, NORID },
- { "", }, { "", }, { "", }, { "", },
- {"const", TYPE_QUAL, RID_CONST },
- { "", }, { "", }, { "", },
- {"long", TYPESPEC, RID_LONG },
- { "", }, { "", },
- {"continue", CONTINUE, NORID },
- { "", }, { "", },
- {"unsigned", TYPESPEC, RID_UNSIGNED },
- { "", }, { "", }, { "", }, { "", }, { "", }, { "", }, { "", }, { "", }, { "", },
- { "", }, { "", }, { "", }, { "", }, { "", },
- {"union", UNION, NORID },
- };
-
- if (len <= MAX_WORD_LENGTH && len >= MIN_WORD_LENGTH)
- {
- register int key = hash (str, len);
-
- if (key <= MAX_HASH_VALUE)
- {
- register char *s = reswords[key].name;
-
- if (*s == *str && !strcmp (str + 1, s + 1))
- return &reswords[key];
- }
- }
- return 0;
- }
-
- /* The elements of `ridpointers' are identifier nodes
- for the reserved type names and storage classes.
- It is indexed by a RID_... value. */
-
- tree ridpointers[(int) RID_MAX];
-
- int check_newline ();
-
- void
- init_lex ()
- {
- /* Start it at 0, because check_newline is called at the very beginning
- and will increment it to 1. */
- lineno = 0;
-
- maxtoken = 40;
- token_buffer = (char *) xmalloc (maxtoken + 2);
- max_wide = 40;
- wide_buffer = (int *) xmalloc (max_wide + 1);
-
- ridpointers[(int) RID_INT] = get_identifier ("int");
- ridpointers[(int) RID_CHAR] = get_identifier ("char");
- ridpointers[(int) RID_VOID] = get_identifier ("void");
- ridpointers[(int) RID_FLOAT] = get_identifier ("float");
- ridpointers[(int) RID_DOUBLE] = get_identifier ("double");
- ridpointers[(int) RID_SHORT] = get_identifier ("short");
- ridpointers[(int) RID_LONG] = get_identifier ("long");
- ridpointers[(int) RID_UNSIGNED] = get_identifier ("unsigned");
- ridpointers[(int) RID_SIGNED] = get_identifier ("signed");
- ridpointers[(int) RID_INLINE] = get_identifier ("inline");
- ridpointers[(int) RID_CONST] = get_identifier ("const");
- ridpointers[(int) RID_VOLATILE] = get_identifier ("volatile");
- ridpointers[(int) RID_AUTO] = get_identifier ("auto");
- ridpointers[(int) RID_STATIC] = get_identifier ("static");
- ridpointers[(int) RID_EXTERN] = get_identifier ("extern");
- ridpointers[(int) RID_TYPEDEF] = get_identifier ("typedef");
- ridpointers[(int) RID_REGISTER] = get_identifier ("register");
- }
-
- static void
- reinit_parse_for_function ()
- {
- }
-
- /* If C is not whitespace, return C.
- Otherwise skip whitespace and return first nonwhite char read. */
-
- static int
- skip_white_space (c)
- register int c;
- {
- #if 0
- register int inside;
- #endif
-
- for (;;)
- {
- switch (c)
- {
- /* Don't recognize comments in cc1: all comments are removed by cpp,
- and cpp output can include / and * consecutively as operators. */
- #if 0
- case '/':
- c = getc (finput);
- if (c != '*')
- {
- ungetc (c, finput);
- return '/';
- }
-
- c = getc (finput);
-
- inside = 1;
- while (inside)
- {
- if (c == '*')
- {
- while (c == '*')
- c = getc (finput);
-
- if (c == '/')
- {
- inside = 0;
- c = getc (finput);
- }
- }
- else if (c == '\n')
- {
- lineno++;
- c = getc (finput);
- }
- else if (c == EOF)
- {
- error ("unterminated comment");
- break;
- }
- else
- c = getc (finput);
- }
-
- break;
- #endif
-
- case '\n':
- c = check_newline ();
- break;
-
- case ' ':
- case '\t':
- case '\f':
- case '\r':
- case '\v':
- case '\b':
- c = getc (finput);
- break;
-
- case '\\':
- c = getc (finput);
- if (c == '\n')
- lineno++;
- else
- error ("stray '\\' in program");
- c = getc (finput);
- break;
-
- default:
- return (c);
- }
- }
- }
-
-
-
- /* Make the token buffer longer, preserving the data in it.
- P should point to just beyond the last valid character in the old buffer.
- The value we return is a pointer to the new buffer
- at a place corresponding to P. */
-
- static char *
- extend_token_buffer (p)
- char *p;
- {
- int offset = p - token_buffer;
-
- maxtoken = maxtoken * 2 + 10;
- token_buffer = (char *) xrealloc (token_buffer, maxtoken + 2);
-
- return token_buffer + offset;
- }
-
- /* At the beginning of a line, increment the line number
- and process any #-directive on this line.
- If the line is a #-directive, read the entire line and return a newline.
- Otherwise, return the line's first non-whitespace character. */
-
- int
- check_newline ()
- {
- register int c;
- register int token;
-
- lineno++;
-
- /* Read first nonwhite char on the line. */
-
- c = getc (finput);
- while (c == ' ' || c == '\t')
- c = getc (finput);
-
- if (c != '#')
- {
- /* If not #, return it so caller will use it. */
- return c;
- }
-
- /* Read first nonwhite char after the `#'. */
-
- c = getc (finput);
- while (c == ' ' || c == '\t')
- c = getc (finput);
-
- /* If a letter follows, then if the word here is `line', skip
- it and ignore it; otherwise, ignore the line, with an error
- if the word isn't `pragma'. */
-
- if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'))
- {
- if (c == 'p')
- {
- if (getc (finput) == 'r'
- && getc (finput) == 'a'
- && getc (finput) == 'g'
- && getc (finput) == 'm'
- && getc (finput) == 'a'
- && ((c = getc (finput)) == ' ' || c == '\t' || c == '\n'))
- goto skipline;
- }
-
- else if (c == 'l')
- {
- if (getc (finput) == 'i'
- && getc (finput) == 'n'
- && getc (finput) == 'e'
- && ((c = getc (finput)) == ' ' || c == '\t'))
- goto linenum;
- }
- else if (c == 'i')
- {
- if (getc (finput) == 'd'
- && getc (finput) == 'e'
- && getc (finput) == 'n'
- && getc (finput) == 't'
- && ((c = getc (finput)) == ' ' || c == '\t'))
- {
- extern FILE *asm_out_file;
-
- if (pedantic)
- error ("ANSI C does not allow #ident");
-
- /* Here we have just seen `#ident '.
- A string constant should follow. */
-
- while (c == ' ' || c == '\t')
- c = getc (finput);
-
- /* If no argument, ignore the line. */
- if (c == '\n')
- return c;
-
- ungetc (c, finput);
- token = yylex ();
- if (token != STRING
- || TREE_CODE (yylval.ttype) != STRING_CST)
- {
- error ("invalid #ident");
- goto skipline;
- }
-
- #ifdef ASM_OUTPUT_IDENT
- ASM_OUTPUT_IDENT (asm_out_file, TREE_STRING_POINTER (yylval.ttype));
- #endif
-
- /* Skip the rest of this line. */
- goto skipline;
- }
- }
-
- error ("undefined or invalid # directive");
- goto skipline;
- }
-
- linenum:
- /* Here we have either `#line' or `# <nonletter>'.
- In either case, it should be a line number; a digit should follow. */
-
- while (c == ' ' || c == '\t')
- c = getc (finput);
-
- /* If the # is the only nonwhite char on the line,
- just ignore it. Check the new newline. */
- if (c == '\n')
- return c;
-
- /* Something follows the #; read a token. */
-
- ungetc (c, finput);
- token = yylex ();
-
- if (token == CONSTANT
- && TREE_CODE (yylval.ttype) == INTEGER_CST)
- {
- int old_lineno = lineno;
- /* subtract one, because it is the following line that
- gets the specified number */
-
- int l = TREE_INT_CST_LOW (yylval.ttype) - 1;
-
- /* Is this the last nonwhite stuff on the line? */
- c = getc (finput);
- while (c == ' ' || c == '\t')
- c = getc (finput);
- if (c == '\n')
- {
- /* No more: store the line number and check following line. */
- lineno = l;
- return c;
- }
- ungetc (c, finput);
-
- /* More follows: it must be a string constant (filename). */
-
- token = yylex ();
- if (token != STRING || TREE_CODE (yylval.ttype) != STRING_CST)
- {
- error ("invalid #line");
- goto skipline;
- }
-
- input_filename
- = (char *) permalloc (TREE_STRING_LENGTH (yylval.ttype) + 1);
- strcpy (input_filename, TREE_STRING_POINTER (yylval.ttype));
- lineno = l;
-
- if (main_input_filename == 0)
- main_input_filename = input_filename;
-
- /* Is this the last nonwhite stuff on the line? */
- c = getc (finput);
- while (c == ' ' || c == '\t')
- c = getc (finput);
- if (c == '\n')
- return c;
- ungetc (c, finput);
-
- token = yylex ();
-
- /* `1' after file name means entering new file.
- `2' after file name means just left a file. */
-
- if (token == CONSTANT
- && TREE_CODE (yylval.ttype) == INTEGER_CST)
- {
- if (TREE_INT_CST_LOW (yylval.ttype) == 1)
- {
- struct file_stack *p
- = (struct file_stack *) xmalloc (sizeof (struct file_stack));
- input_file_stack->line = old_lineno;
- p->next = input_file_stack;
- p->name = input_filename;
- input_file_stack = p;
- input_file_stack_tick++;
- }
- else if (input_file_stack->next)
- {
- struct file_stack *p = input_file_stack;
- input_file_stack = p->next;
- free (p);
- input_file_stack_tick++;
- }
- else
- error ("#-lines for entering and leaving files don't match");
- }
- }
- else
- error ("invalid #-line");
-
- /* skip the rest of this line. */
- skipline:
- if (c == '\n')
- return c;
- while ((c = getc (finput)) != EOF && c != '\n');
- return c;
- }
-
- #define isalnum(char) ((char >= 'a' && char <= 'z') || (char >= 'A' && char <= 'Z') || (char >= '0' && char <= '9'))
- #define isdigit(char) (char >= '0' && char <= '9')
- #define ENDFILE -1 /* token that represents end-of-file */
-
-
- static int
- readescape ()
- {
- register int c = getc (finput);
- register int count, code;
- int firstdig;
-
- switch (c)
- {
- case 'x':
- code = 0;
- count = 0;
- while (1)
- {
- c = getc (finput);
- if (!(c >= 'a' && c <= 'f')
- && !(c >= 'A' && c <= 'F')
- && !(c >= '0' && c <= '9'))
- {
- ungetc (c, finput);
- break;
- }
- code *= 16;
- if (c >= 'a' && c <= 'f')
- code += c - 'a' + 10;
- if (c >= 'A' && c <= 'F')
- code += c - 'A' + 10;
- if (c >= '0' && c <= '9')
- code += c - '0';
- if (count == 0)
- firstdig = code;
- count++;
- }
- if (count == 0)
- error ("\\x used with no following hex digits");
- else if ((count - 1) * 4 >= TYPE_PRECISION (integer_type_node)
- || ((1 << (TYPE_PRECISION (integer_type_node) - (count - 1) * 4))
- <= firstdig))
- warning ("hex escape out of range");
- return code;
-
- case '0': case '1': case '2': case '3': case '4':
- case '5': case '6': case '7':
- code = 0;
- count = 0;
- while ((c <= '7') && (c >= '0') && (count++ < 3))
- {
- code = (code * 8) + (c - '0');
- c = getc (finput);
- }
- ungetc (c, finput);
- return code;
-
- case '\\': case '\'': case '"':
- return c;
-
- case '\n':
- lineno++;
- return -1;
-
- case 'n':
- return TARGET_NEWLINE;
-
- case 't':
- return TARGET_TAB;
-
- case 'r':
- return TARGET_CR;
-
- case 'f':
- return TARGET_FF;
-
- case 'b':
- return TARGET_BS;
-
- case 'a':
- return TARGET_BELL;
-
- case 'v':
- return TARGET_VT;
-
- case 'E':
- return 033;
-
- case '?':
- /* `\(', etc, are used at beginning of line to avoid confusing Emacs. */
- case '(':
- case '{':
- case '[':
- return c;
- }
- if (c >= 040 && c <= 0177)
- warning ("unknown escape sequence `\\%c'", c);
- else
- warning ("unknown escape sequence: `\\' followed by char code 0x%x", c);
- return c;
- }
-
- void
- yyerror (string)
- char *string;
- {
- char buf[200];
-
- strcpy (buf, string);
-
- /* We can't print string and character constants well
- because the token_buffer contains the result of processing escapes. */
- if (end_of_file)
- strcat (buf, " at end of input");
- else if (token_buffer[0] == 0)
- strcat (buf, " at null character");
- else if (token_buffer[0] == '"')
- strcat (buf, " before string constant");
- else if (token_buffer[0] == '\'')
- strcat (buf, " before character constant");
- else if (token_buffer[0] < 040 || token_buffer[0] >= 0177)
- sprintf (buf + strlen (buf), " before character 0%o", token_buffer[0]);
- else
- strcat (buf, " before `%s'");
-
- error (buf, token_buffer);
- }
-
- static int nextchar = -1;
-
- static int
- yylex ()
- {
- register int c;
- register char *p;
- register int value;
- int wide_flag = 0;
-
- if (nextchar >= 0)
- c = nextchar, nextchar = -1;
- else
- c = getc (finput);
-
- /* Effectively do c = skip_white_space (c)
- but do it faster in the usual cases. */
- while (1)
- switch (c)
- {
- case ' ':
- case '\t':
- case '\f':
- case '\r':
- case '\v':
- case '\b':
- c = getc (finput);
- break;
-
- case '\n':
- case '/':
- case '\\':
- c = skip_white_space (c);
- default:
- goto found_nonwhite;
- }
- found_nonwhite:
-
- token_buffer[0] = c;
- token_buffer[1] = 0;
-
- /* yylloc.first_line = lineno; */
-
- switch (c)
- {
- case EOF:
- end_of_file = 1;
- token_buffer[0] = 0;
- value = ENDFILE;
- break;
-
- case '$':
- if (dollars_in_ident)
- goto letter;
- return '$';
-
- case 'L':
- /* Capital L may start a wide-string or wide-character constant. */
- {
- register int c = getc (finput);
- if (c == '\'')
- {
- wide_flag = 1;
- goto char_constant;
- }
- if (c == '"')
- {
- wide_flag = 1;
- goto string_constant;
- }
- ungetc (c, finput);
- }
-
- case 'A': case 'B': case 'C': case 'D': case 'E':
- case 'F': case 'G': case 'H': case 'I': case 'J':
- case 'K': case 'M': case 'N': case 'O':
- case 'P': case 'Q': case 'R': case 'S': case 'T':
- case 'U': case 'V': case 'W': case 'X': case 'Y':
- case 'Z':
- case 'a': case 'b': case 'c': case 'd': case 'e':
- case 'f': case 'g': case 'h': case 'i': case 'j':
- case 'k': case 'l': case 'm': case 'n': case 'o':
- case 'p': case 'q': case 'r': case 's': case 't':
- case 'u': case 'v': case 'w': case 'x': case 'y':
- case 'z':
- case '_':
- letter:
- p = token_buffer;
- while (isalnum (c) || c == '_' || c == '$')
- {
- if (p >= token_buffer + maxtoken)
- p = extend_token_buffer (p);
- if (c == '$' && ! dollars_in_ident)
- break;
-
- *p++ = c;
- c = getc (finput);
- }
-
- *p = 0;
- nextchar = c;
-
- value = IDENTIFIER;
- yylval.itype = 0;
-
- /* Try to recognize a keyword. Uses minimum-perfect hash function */
-
- {
- register struct resword *ptr;
-
- if (ptr = is_reserved_word (token_buffer, p - token_buffer))
- {
- if (ptr->rid)
- yylval.ttype = ridpointers[(int) ptr->rid];
- if ((! flag_no_asm
- /* -fno-asm means don't recognize the non-ANSI keywords. */
- || ((int) ptr->token != ASM
- && (int) ptr->token != TYPEOF
- && ptr->rid != RID_INLINE)
- /* Recognize __asm and __inline despite -fno-asm. */
- || token_buffer[0] == '_')
- /* -ftraditional means don't recognize nontraditional keywords
- typeof, const, volatile, signed or inline. */
- && (! flag_traditional
- || ((int) ptr->token != TYPE_QUAL
- && (int) ptr->token != TYPEOF
- && ptr->rid != RID_SIGNED
- && ptr->rid != RID_INLINE)
- /* Recognize __inline, etc. despite -ftraditional. */
- || token_buffer[0] == '_'))
- value = (int) ptr->token;
- }
- }
-
- /* If we did not find a keyword, look for an identifier
- (or a typename). */
-
- if (value == IDENTIFIER)
- {
- yylval.ttype = get_identifier (token_buffer);
- lastiddecl = lookup_name (yylval.ttype);
-
- if (lastiddecl != 0 && TREE_CODE (lastiddecl) == TYPE_DECL)
- value = TYPENAME;
- }
-
- break;
-
- case '0': case '1': case '2': case '3': case '4':
- case '5': case '6': case '7': case '8': case '9':
- case '.':
- {
- int base = 10;
- int count = 0;
- int largest_digit = 0;
- int numdigits = 0;
- /* for multi-precision arithmetic,
- we store only 8 live bits in each short,
- giving us 64 bits of reliable precision */
- short shorts[8];
- int overflow = 0;
-
- enum anon1 { NOT_FLOAT, AFTER_POINT, TOO_MANY_POINTS} floatflag
- = NOT_FLOAT;
-
- for (count = 0; count < 8; count++)
- shorts[count] = 0;
-
- p = token_buffer;
- *p++ = c;
-
- if (c == '0')
- {
- *p++ = (c = getc (finput));
- if ((c == 'x') || (c == 'X'))
- {
- base = 16;
- *p++ = (c = getc (finput));
- }
- else
- {
- base = 8;
- numdigits++;
- }
- }
-
- /* Read all the digits-and-decimal-points. */
-
- while (c == '.'
- || (isalnum (c) && (c != 'l') && (c != 'L')
- && (c != 'u') && (c != 'U')
- && (floatflag == NOT_FLOAT || ((c != 'f') && (c != 'F')))))
- {
- if (c == '.')
- {
- if (base == 16)
- error ("floating constant may not be in radix 16");
- if (floatflag == AFTER_POINT)
- {
- error ("malformed floating constant");
- floatflag = TOO_MANY_POINTS;
- }
- else
- floatflag = AFTER_POINT;
-
- base = 10;
- *p++ = c = getc (finput);
- /* Accept '.' as the start of a floating-point number
- only when it is followed by a digit.
- Otherwise, unread the following non-digit
- and use the '.' as a structural token. */
- if (p == token_buffer + 2 && !isdigit (c))
- {
- if (c == '.')
- {
- c = getc (finput);
- if (c == '.')
- {
- *p++ = c;
- *p = 0;
- return ELLIPSIS;
- }
- error ("parse error at `..'");
- }
- ungetc (c, finput);
- token_buffer[1] = 0;
- value = '.';
- goto done;
- }
- }
- else
- {
- /* It is not a decimal point.
- It should be a digit (perhaps a hex digit). */
-
- if (isdigit (c))
- {
- c = c - '0';
- }
- else if (base <= 10)
- {
- if ((c&~040) == 'E')
- {
- base = 10;
- floatflag = AFTER_POINT;
- break; /* start of exponent */
- }
- error ("nondigits in number and not hexadecimal");
- c = 0;
- }
- else if (c >= 'a')
- {
- c = c - 'a' + 10;
- }
- else
- {
- c = c - 'A' + 10;
- }
- if (c >= largest_digit)
- largest_digit = c;
- numdigits++;
-
- for (count = 0; count < 8; count++)
- {
- shorts[count] *= base;
- if (count)
- {
- shorts[count] += (shorts[count-1] >> 8);
- shorts[count-1] &= (1<<8)-1;
- }
- else shorts[0] += c;
- }
-
- if (shorts[7] >= 1<<8
- || shorts[7] < - (1 << 8))
- overflow = TRUE;
-
- if (p >= token_buffer + maxtoken - 3)
- p = extend_token_buffer (p);
- *p++ = (c = getc (finput));
- }
- }
-
- if (numdigits == 0)
- error ("numeric constant with no digits");
-
- if (largest_digit >= base)
- error ("numeric constant contains digits beyond the radix");
-
- /* Remove terminating char from the token buffer and delimit the string */
- *--p = 0;
-
- if (floatflag != NOT_FLOAT)
- {
- tree type = double_type_node;
- char f_seen = 0;
- char l_seen = 0;
- REAL_VALUE_TYPE value;
-
- /* Read explicit exponent if any, and put it in tokenbuf. */
-
- if ((c == 'e') || (c == 'E'))
- {
- if (p >= token_buffer + maxtoken - 3)
- p = extend_token_buffer (p);
- *p++ = c;
- c = getc (finput);
- if ((c == '+') || (c == '-'))
- {
- *p++ = c;
- c = getc (finput);
- }
- if (! isdigit (c))
- error ("floating constant exponent has no digits");
- while (isdigit (c))
- {
- if (p >= token_buffer + maxtoken - 3)
- p = extend_token_buffer (p);
- *p++ = c;
- c = getc (finput);
- }
- }
-
- *p = 0;
- errno = 0;
- value = REAL_VALUE_ATOF (token_buffer);
- #ifdef ERANGE
- if (errno == ERANGE && !flag_traditional)
- {
- char *p1 = token_buffer;
- /* Check for "0.0" and variants;
- Sunos 4 spuriously returns ERANGE for them. */
- while (*p1 == '0') p1++;
- if (*p1 == '.')
- {
- p1++;
- while (*p1 == '0') p1++;
- }
- if (*p1 == 'e' || *p1 == 'E')
- {
- /* with significand==0, ignore the exponent */
- p1++;
- while (*p1 != 0) p1++;
- }
- /* ERANGE is also reported for underflow,
- so test the value to distinguish overflow from that. */
- if (*p1 != 0 && (value > 1.0 || value < 1.0))
- warning ("floating point number exceeds range of `double'");
- }
- #endif
-
- /* Read the suffixes to choose a data type. */
- while (1)
- {
- if (c == 'f' || c == 'F')
- {
- float floater;
- if (f_seen)
- error ("two `f's in floating constant");
- f_seen = 1;
- type = float_type_node;
- floater = value;
- value = floater;
- }
- else if (c == 'l' || c == 'L')
- {
- if (l_seen)
- error ("two `l's in floating constant");
- l_seen = 1;
- type = long_double_type_node;
- }
- else
- {
- if (isalnum (c))
- {
- error ("garbage at end of number");
- while (isalnum (c))
- {
- if (p >= token_buffer + maxtoken - 3)
- p = extend_token_buffer (p);
- *p++ = c;
- c = getc (finput);
- }
- }
- break;
- }
- if (p >= token_buffer + maxtoken - 3)
- p = extend_token_buffer (p);
- *p++ = c;
- c = getc (finput);
- }
-
- /* Create a node with determined type and value. */
- yylval.ttype = build_real (type, value);
-
- ungetc (c, finput);
- *p = 0;
- }
- else
- {
- tree type;
- int spec_unsigned = 0;
- int spec_long = 0;
- int spec_long_long = 0;
-
- while (1)
- {
- if (c == 'u' || c == 'U')
- {
- if (spec_unsigned)
- error ("two `u's in integer constant");
- spec_unsigned = 1;
- }
- else if (c == 'l' || c == 'L')
- {
- if (spec_long)
- {
- if (spec_long_long)
- error ("three `l's in integer constant");
- else if (pedantic)
- warning ("ANSI C forbids long long integer constants");
- spec_long_long = 1;
- }
- spec_long = 1;
- }
- else
- {
- if (isalnum (c))
- {
- error ("garbage at end of number");
- while (isalnum (c))
- {
- if (p >= token_buffer + maxtoken - 3)
- p = extend_token_buffer (p);
- *p++ = c;
- c = getc (finput);
- }
- }
- break;
- }
- if (p >= token_buffer + maxtoken - 3)
- p = extend_token_buffer (p);
- *p++ = c;
- c = getc (finput);
- }
-
- ungetc (c, finput);
-
- if ((overflow || shorts[7] || shorts[6] || shorts[5] || shorts[4])
- && !spec_long_long)
- warning ("integer constant out of range");
-
- /* If it won't fit in a signed long long, make it unsigned.
- We can't distinguish based on the tree node because
- any integer constant fits any long long type. */
- if (shorts[7] >= (1<<8))
- spec_unsigned = 1;
-
- /* This is simplified by the fact that our constant
- is always positive. */
- yylval.ttype
- = (build_int_2
- ((shorts[3]<<24) + (shorts[2]<<16) + (shorts[1]<<8) + shorts[0],
- (spec_long_long
- ? (shorts[7]<<24) + (shorts[6]<<16) + (shorts[5]<<8) + shorts[4]
- : 0)));
-
- if (!spec_long && !spec_unsigned
- && int_fits_type_p (yylval.ttype, integer_type_node))
- type = integer_type_node;
-
- else if (!spec_long && base != 10
- && int_fits_type_p (yylval.ttype, unsigned_type_node))
- type = unsigned_type_node;
-
- else if (!spec_unsigned && !spec_long_long
- && int_fits_type_p (yylval.ttype, long_integer_type_node))
- type = long_integer_type_node;
-
- else if (! spec_long_long
- && int_fits_type_p (yylval.ttype,
- long_unsigned_type_node))
- type = long_unsigned_type_node;
-
- else if (! spec_unsigned
- && int_fits_type_p (yylval.ttype,
- long_long_integer_type_node))
- type = long_long_integer_type_node;
-
- else if (int_fits_type_p (yylval.ttype,
- long_long_unsigned_type_node))
- type = long_long_unsigned_type_node;
-
- else
- {
- type = long_long_integer_type_node;
- warning ("integer constant out of range");
- }
-
- TREE_TYPE (yylval.ttype) = type;
- }
-
- value = CONSTANT; break;
- }
-
- case '\'':
- char_constant:
- {
- register int result = 0;
- register num_chars = 0;
- int width = TYPE_PRECISION (char_type_node);
- int max_chars;
-
- if (wide_flag) width = TYPE_PRECISION (integer_type_node);
-
- max_chars = TYPE_PRECISION (integer_type_node) / width;
-
- while (1)
- {
- tryagain:
-
- c = getc (finput);
-
- if (c == '\'' || c == EOF)
- break;
-
- if (c == '\\')
- {
- c = readescape ();
- if (c < 0)
- goto tryagain;
- if (width < HOST_BITS_PER_INT
- && (unsigned) c >= (1 << width))
- warning ("escape sequence out of range for character");
- }
- else if (c == '\n')
- {
- if (pedantic)
- warning ("ANSI C forbids newline in character constant");
- lineno++;
- }
-
- num_chars++;
- if (num_chars > maxtoken - 4)
- extend_token_buffer (token_buffer);
-
- token_buffer[num_chars] = c;
-
- /* Merge character into result; ignore excess chars. */
- if (num_chars < max_chars + 1)
- {
- if (width < HOST_BITS_PER_INT)
- result = (result << width) | (c & ((1 << width) - 1));
- else
- result = c;
- }
- }
-
- token_buffer[num_chars + 1] = '\'';
- token_buffer[num_chars + 2] = 0;
-
- if (c != '\'')
- error ("malformatted character constant");
- else if (num_chars == 0)
- error ("empty character constant");
- else if (num_chars > max_chars)
- {
- num_chars = max_chars;
- error ("character constant too long");
- }
- else if (num_chars != 1 && ! flag_traditional)
- warning ("multi-character character constant");
-
- /* If char type is signed, sign-extend the constant. */
- if (! wide_flag)
- {
- int num_bits = num_chars * width;
- if (TREE_UNSIGNED (char_type_node)
- || ((result >> (num_bits - 1)) & 1) == 0)
- yylval.ttype
- = build_int_2 (result & ((unsigned) ~0
- >> (HOST_BITS_PER_INT - num_bits)),
- 0);
- else
- yylval.ttype
- = build_int_2 (result | ~((unsigned) ~0
- >> (HOST_BITS_PER_INT - num_bits)),
- -1);
- }
- else
- yylval.ttype = build_int_2 (result, 0);
-
- TREE_TYPE (yylval.ttype) = integer_type_node;
- value = CONSTANT; break;
- }
-
- case '"':
- string_constant:
- {
- int *widep;
-
- c = getc (finput);
- p = token_buffer + 1;
-
- if (wide_flag)
- widep = wide_buffer;
-
- while (c != '"' && c >= 0)
- {
- if (c == '\\')
- {
- c = readescape ();
- if (c < 0)
- goto skipnewline;
- if (!wide_flag && c >= (1 << TYPE_PRECISION (char_type_node)))
- warning ("escape sequence out of range for character");
- }
- else if (c == '\n')
- {
- if (pedantic)
- warning ("ANSI C forbids newline in string constant");
- lineno++;
- }
-
- /* Store the char in C into the appropriate buffer. */
-
- if (wide_flag)
- {
- if (widep == wide_buffer + max_wide)
- {
- int n = widep - wide_buffer;
- max_wide *= 2;
- wide_buffer = (int *) xrealloc (wide_buffer, max_wide + 1);
- widep = wide_buffer + n;
- }
- *widep++ = c;
- }
- else
- {
- if (p == token_buffer + maxtoken)
- p = extend_token_buffer (p);
- *p++ = c;
- }
-
- skipnewline:
- c = getc (finput);
- }
-
- /* We have read the entire constant.
- Construct a STRING_CST for the result. */
-
- if (wide_flag)
- {
- /* If this is a L"..." wide-string, make a vector
- of the ints in wide_buffer. */
- *widep = 0;
- /* We have not implemented the case where `int'
- on the target and on the execution machine differ in size. */
- if (TYPE_PRECISION (integer_type_node)
- != sizeof (int) * BITS_PER_UNIT)
- abort ();
- yylval.ttype
- = build_string ((widep - wide_buffer + 1) * sizeof (int),
- wide_buffer);
- TREE_TYPE (yylval.ttype) = int_array_type_node;
- }
- else
- {
- *p = 0;
- yylval.ttype = build_string (p - token_buffer, token_buffer + 1);
- TREE_TYPE (yylval.ttype) = char_array_type_node;
- }
-
- *p++ = '"';
- *p = 0;
-
- value = STRING; break;
- }
-
- case '+':
- case '-':
- case '&':
- case '|':
- case '<':
- case '>':
- case '*':
- case '/':
- case '%':
- case '^':
- case '!':
- case '=':
- {
- register int c1;
-
- combine:
-
- switch (c)
- {
- case '+':
- yylval.code = PLUS_EXPR; break;
- case '-':
- yylval.code = MINUS_EXPR; break;
- case '&':
- yylval.code = BIT_AND_EXPR; break;
- case '|':
- yylval.code = BIT_IOR_EXPR; break;
- case '*':
- yylval.code = MULT_EXPR; break;
- case '/':
- yylval.code = TRUNC_DIV_EXPR; break;
- case '%':
- yylval.code = TRUNC_MOD_EXPR; break;
- case '^':
- yylval.code = BIT_XOR_EXPR; break;
- case LSHIFT:
- yylval.code = LSHIFT_EXPR; break;
- case RSHIFT:
- yylval.code = RSHIFT_EXPR; break;
- case '<':
- yylval.code = LT_EXPR; break;
- case '>':
- yylval.code = GT_EXPR; break;
- }
-
- token_buffer[1] = c1 = getc (finput);
- token_buffer[2] = 0;
-
- if (c1 == '=')
- {
- switch (c)
- {
- case '<':
- value = ARITHCOMPARE; yylval.code = LE_EXPR; goto done;
- case '>':
- value = ARITHCOMPARE; yylval.code = GE_EXPR; goto done;
- case '!':
- value = EQCOMPARE; yylval.code = NE_EXPR; goto done;
- case '=':
- value = EQCOMPARE; yylval.code = EQ_EXPR; goto done;
- }
- value = ASSIGN; goto done;
- }
- else if (c == c1)
- switch (c)
- {
- case '+':
- value = PLUSPLUS; goto done;
- case '-':
- value = MINUSMINUS; goto done;
- case '&':
- value = ANDAND; goto done;
- case '|':
- value = OROR; goto done;
- case '<':
- c = LSHIFT;
- goto combine;
- case '>':
- c = RSHIFT;
- goto combine;
- }
- else if ((c == '-') && (c1 == '>'))
- { value = POINTSAT; goto done; }
- ungetc (c1, finput);
- token_buffer[1] = 0;
-
- if ((c == '<') || (c == '>'))
- value = ARITHCOMPARE;
- else value = c;
- goto done;
- }
-
- case 0:
- /* Don't make yyparse think this is eof. */
- value = 1;
- break;
-
- default:
- value = c;
- }
-
- done:
- /* yylloc.last_line = lineno; */
-
- return value;
- }
-