6 * Copyright (C) 2003 Transmeta Corp.
9 * Licensed under the Open Software License version 1.1
11 * Declarations and helper functions for expression parsing.
16 struct expression_list
;
18 enum expression_type
{
35 EXPR_SELECT
, // a "safe" conditional expression
41 EXPR_INITIALIZER
, // initializer list
42 EXPR_IDENTIFIER
, // identifier in initializer
43 EXPR_INDEX
, // index in initializer
44 EXPR_POS
, // position in initializer
53 }; /* for expr->flags */
56 enum expression_type type
:8;
63 unsigned long long value
;
69 struct string
*string
;
71 // EXPR_UNOP, EXPR_PREOP and EXPR_POSTOP
73 struct expression
*unop
;
74 unsigned long op_value
;
77 // EXPR_SYMBOL, EXPR_TYPE
78 struct /* symbol_arg */ {
79 struct symbol
*symbol
;
80 struct ident
*symbol_name
;
84 struct statement
*statement
;
86 // EXPR_BINOP, EXPR_COMMA, EXPR_COMPARE, EXPR_LOGICAL and EXPR_ASSIGNMENT
87 struct /* binop_arg */ {
88 struct expression
*left
, *right
;
91 struct /* deref_arg */ {
92 struct expression
*deref
;
97 struct expression
*base
;
98 unsigned r_bitpos
, r_nrbits
;
100 // EXPR_CAST and EXPR_SIZEOF
101 struct /* cast_arg */ {
102 struct symbol
*cast_type
;
103 struct expression
*cast_expression
;
107 struct /* conditional_expr */ {
108 struct expression
*conditional
, *cond_true
, *cond_false
;
111 struct /* call_expr */ {
112 struct expression
*fn
;
113 struct expression_list
*args
;
116 struct /* label_expr */ {
117 struct symbol
*label_symbol
;
120 struct expression_list
*expr_list
;
122 struct /* ident_expr */ {
123 struct ident
*expr_ident
;
124 struct symbol
*field
;
125 struct expression
*ident_expression
;
128 struct /* index_expr */ {
129 unsigned int idx_from
, idx_to
;
130 struct expression
*idx_expression
;
133 struct /* initpos_expr */ {
134 unsigned int init_offset
, init_nr
;
135 struct expression
*init_expr
;
140 struct expression
*down
;
143 struct expression
*index
;
149 /* Constant expression values */
150 long long get_expression_value(struct expression
*);
151 long long const_expression_value(struct expression
*);
153 /* Expression parsing */
154 struct token
*parse_expression(struct token
*token
, struct expression
**tree
);
155 struct token
*conditional_expression(struct token
*token
, struct expression
**tree
);
156 struct token
*primary_expression(struct token
*token
, struct expression
**tree
);
157 struct token
*parens_expression(struct token
*token
, struct expression
**expr
, const char *where
);
158 struct token
*assignment_expression(struct token
*token
, struct expression
**tree
);
160 extern void evaluate_symbol_list(struct symbol_list
*list
);
161 extern struct symbol
*evaluate_statement(struct statement
*stmt
);
162 extern struct symbol
*evaluate_expression(struct expression
*);
164 extern int expand_symbol(struct symbol
*);
166 static inline struct expression
*alloc_expression(struct position pos
, int type
)
168 struct expression
*expr
= __alloc_expression(0);
174 static inline struct expression
*alloc_const_expression(struct position pos
, int value
)
176 struct expression
*expr
= __alloc_expression(0);
177 expr
->type
= EXPR_VALUE
;
180 expr
->ctype
= &int_ctype
;
184 /* Type name parsing */
185 struct token
*typename(struct token
*, struct symbol
**);
187 static inline int lookup_type(struct token
*token
)
189 if (token
->pos
.type
== TOKEN_IDENT
) {
190 struct symbol
*sym
= lookup_symbol(token
->ident
, NS_SYMBOL
| NS_TYPEDEF
);
191 return sym
&& sym
->namespace == NS_TYPEDEF
;
196 /* Statement parsing */
197 struct statement
*alloc_statement(struct position pos
, int type
);
198 struct token
*initializer(struct expression
**tree
, struct token
*token
);
199 struct token
*compound_statement(struct token
*, struct statement
*);
201 /* The preprocessor calls this 'constant_expression()' */
202 #define constant_expression(token,tree) conditional_expression(token, tree)
204 /* Cast folding of constant values.. */
205 void cast_value(struct expression
*expr
, struct symbol
*newtype
,
206 struct expression
*old
, struct symbol
*oldtype
);