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71 lines
1.5 KiB
C
71 lines
1.5 KiB
C
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#ifndef EXTREE__H
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#define EXTREE__H
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#include "symbols.h"
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typedef struct ex_tree {
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enum ex_type { EX_LIT = 1,
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/* Expression is a literal value */
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EX_SYM = 2,
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/* Expression has a symbol reference */
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EX_UNDEFINED_SYM = 3,
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/* Expression is undefined sym reference */
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EX_TEMP_SYM = 4,
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/* Expression is temp sym reference */
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EX_COM = 5,
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/* One's complement */
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EX_NEG = 6,
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/* Negate */
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EX_ERR = 7,
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/* Expression with an error */
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EX_ADD = 8,
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/* Add */
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EX_SUB = 9,
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/* Subtract */
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EX_MUL = 10,
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/* Multiply */
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EX_DIV = 11,
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/* Divide */
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EX_AND = 12,
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/* bitwise and */
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EX_OR = 13 /* bitwise or */
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} type;
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char *cp; /* points to end of parsed expression */
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union {
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struct {
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struct ex_tree *left,
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*right; /* Left, right children */
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} child;
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unsigned lit; /* Literal value */
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SYMBOL *symbol; /* Symbol reference */
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} data;
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} EX_TREE;
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EX_TREE *new_ex_tree(
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void);
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void free_tree(
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EX_TREE *tp);
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EX_TREE *new_ex_lit(
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unsigned value);
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EX_TREE *ex_err(
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EX_TREE *tp,
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char *cp);
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EX_TREE *new_ex_bin(
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int type,
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EX_TREE *left,
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EX_TREE *right);
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EX_TREE *evaluate(
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EX_TREE *tp,
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int undef);
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#endif
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