97 lines
2.3 KiB
C
97 lines
2.3 KiB
C
/* $Id$ */
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/*
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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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#ifndef nil
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#define nil 0
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#endif
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/* Symbol/Expression type: */
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#define T_VAR 0x0000
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#define T_CHAN 0x0001
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#define T_CONST 0x0002
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#define T_VALUE 0x0003
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#define T_PROC 0x0004
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#define T_NOW 0x0005
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#define T_VOID 0x0006
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#define T_TYPE 0x0007 /* Mask for type bits */
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/* Flags: */
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#define T_ARR 0x0008 /* Object is an array */
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#define T_BYTE 0x0010 /* Object is a byte array if T_ARR */
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#define T_PARAM 0x0020 /* Formal parameter */
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#define T_LVALUE 0x0040 /* This object may be assigned */
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#define T_NOTDECL 0x0080 /* If you didn't declare it */
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#define T_USED 0x0100 /* If you've used it */
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#define T_ASSIGNED 0x0200 /* Or assigned it */
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#define T_REP 0x0400 /* Replicator index */
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#define T_BUILTIN 0x0800 /* Builtin name */
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#define T_RECURS 0x1000 /* This proc is now compiled */
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/* Note that some types and flags are only used for symbols, and others only
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* for expressions.
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*/
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struct symbol;
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struct par_list { /* List of parameter types for a proc object */
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struct par_list *pr_next;
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struct symbol *pr_var; /* The formal parameter while visible */
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int pr_type; /* Its type */
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};
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struct expr;
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union storage { /* An object is found */
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int level; /* either at a certain local level */
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char *builtin; /* or using a global builtin name */
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};
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union type_info {
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struct {
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union storage st;
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int offset; /* from its local level or builtin name */
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} vc; /* Variable or channel */
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struct expr *t_const;
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struct {
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union storage st;
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char *file; /* file it is in */
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int label; /* A unique id*/
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struct par_list *pars;
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} proc;
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};
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struct symbol {
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char *s_name;
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short s_type;
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int s_arr_siz;
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union type_info s_info;
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struct symbol *s_left, *s_right;
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};
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struct symtab {
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struct symbol *local;
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struct symtab *global;
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int old_offset;
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};
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struct symbol *insert();
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struct symbol *searchall();
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void sym_down();
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void sym_up();
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void var_memory(), chan_memory();
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void pars_add();
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int form_offsets();
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void check_recursion();
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#define var_constant(v) (((v)->s_type&T_TYPE)==T_CONST)
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#define var_proc(v) (((v)->s_type&T_TYPE)==T_PROC)
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#define var_declared(v) (! ((v)->s_type&T_NOTDECL))
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extern union type_info none;
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