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If the command line option yus to allow the underscore character in symbols is NOT selected, then interpret underscore as a new binary operator meaning to do a left shift of the left side value by the number of bit positions indicated by the right side value. As for the arithmetic operators, both values must be literal (numeric constants or symbols equated to a numeric constant).
74 lines
1.5 KiB
C
74 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,
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/* bitwise or */
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EX_LSH = 14
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/* left shift */
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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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