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symtab.h
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/****************************************************************/
/* */
/* S Y M B O L T A B L E (Header) */
/* */
/* FILE: symtab.h */
/* */
/* MODULE: symbol table */
/* */
/* Copyright (c) 1991 by Ronald Mak */
/* For instructional purposes only. No warranties. */
/* */
/****************************************************************/
#ifndef symtab_h
#define symtab_h
#include "common.h"
/*--------------------------------------------------------------*/
/* Value structure */
/*--------------------------------------------------------------*/
typedef union {
int integer;
float real;
char character;
char *stringp;
} VALUE;
/*--------------------------------------------------------------*/
/* Definition structure */
/*--------------------------------------------------------------*/
typedef enum {
UNDEFINED,
CONST_DEFN, TYPE_DEFN, VAR_DEFN, FIELD_DEFN,
VALPARM_DEFN, VARPARM_DEFN,
PROG_DEFN, PROC_DEFN, FUNC_DEFN,
} DEFN_KEY;
typedef enum {
DECLARED, FORWARD,
READ, READLN, WRITE, WRITELN,
ABS, ARCTAN, CHR, COS, EOFF, EOLN, EXP, LN, ODD, ORD,
PRED, ROUND, SIN, SQR, SQRT, SUCC, TRUNC,
} ROUTINE_KEY;
typedef struct {
DEFN_KEY key;
union {
struct {
VALUE value;
} constant;
struct {
ROUTINE_KEY key;
int parm_count;
int total_parm_size;
int total_local_size;
struct symtab_node *parms;
struct symtab_node *locals;
struct symtab_node *local_symtab;
char *code_segment;
} routine;
struct {
int offset;
struct symtab_node *record_idp;
} data;
} info;
} DEFN_STRUCT;
/*--------------------------------------------------------------*/
/* Type structure */
/*--------------------------------------------------------------*/
typedef enum {
NO_FORM,
SCALAR_FORM, ENUM_FORM, SUBRANGE_FORM,
ARRAY_FORM, RECORD_FORM,
} TYPE_FORM;
typedef struct type_struct {
TYPE_FORM form;
int size;
struct symtab_node *type_idp;
union {
struct {
struct symtab_node *const_idp;
int max;
} enumeration;
struct {
struct type_struct *range_typep;
int min, max;
} subrange;
struct {
struct type_struct *index_typep, *elmt_typep;
int min_index, max_index;
int elmt_count;
} array;
struct {
struct symtab_node *field_symtab;
} record;
} info;
} TYPE_STRUCT, *TYPE_STRUCT_PTR;
/*--------------------------------------------------------------*/
/* Symbol table node */
/*--------------------------------------------------------------*/
typedef struct symtab_node {
struct symtab_node *left, *right; /* ptrs to subtrees */
struct symtab_node *next; /* for chaining nodes */
char *name; /* name string */
char *info; /* ptr to generic info */
DEFN_STRUCT defn; /* definition struct */
TYPE_STRUCT_PTR typep; /* ptr to type struct */
int level; /* nesting level */
int label_index; /* index for code label */
} SYMTAB_NODE, *SYMTAB_NODE_PTR;
/*--------------------------------------------------------------*/
/* Functions */
/*--------------------------------------------------------------*/
SYMTAB_NODE_PTR search_symtab();
SYMTAB_NODE_PTR enter_symtab();
TYPE_STRUCT_PTR make_string_typep();
/****************************************/
/* */
/* Macros to search symbol tables */
/* */
/****************************************/
/*--------------------------------------------------------------*/
/* search_this_symtab Search the given symbol */
/* table for the current id */
/* name. Set a pointer to the */
/* entry if found, else to */
/* NULL. */
/*--------------------------------------------------------------*/
#define search_this_symtab(idp, this_symtab) \
idp = search_symtab(word_string, this_symtab)
/*--------------------------------------------------------------*/
/* search_all_symtab Search the local symbol */
/* table for the current id */
/* name. Set a pointer to the */
/* entry if found, else to */
/* NULL. */
/*--------------------------------------------------------------*/
#define search_all_symtab(idp) \
idp = search_symtab(word_string, symtab_root)
/*--------------------------------------------------------------*/
/* enter_local_symtab Enter the current id name */
/* into the local symbol */
/* table, and set a pointer */
/* to the entry. */
/*--------------------------------------------------------------*/
#define enter_local_symtab(idp) \
idp = enter_symtab(word_string, &symtab_root)
/*--------------------------------------------------------------*/
/* enter_name_local_symtab Enter the given name into */
/* the local symbol table, and */
/* set a pointer to the entry. */
/*--------------------------------------------------------------*/
#define enter_name_local_symtab(idp, name) \
idp = enter_symtab(name, &symtab_root)
/*--------------------------------------------------------------*/
/* search_and_find_all_symtab Search the local symbol */
/* table for the current id */
/* name. If not found, ID */
/* UNDEFINED error, and enter */
/* into the local symbol table.*/
/* Set a pointer to the entry. */
/*--------------------------------------------------------------*/
#define search_and_find_all_symtab(idp) \
if ((idp = search_symtab(word_string, \
symtab_root)) == NULL) { \
error(UNDEFINED_IDENTIFIER); \
idp = enter_symtab(word_string, &symtab_root); \
idp->defn.key = UNDEFINED; \
idp->typep = &dummy_type; \
}
/*--------------------------------------------------------------*/
/* search_and_enter_local_symtab Search the local symbol */
/* table for the current id */
/* name. Enter the name if */
/* it is not already in there, */
/* else ID REDEFINED error. */
/* Set a pointer to the entry. */
/*--------------------------------------------------------------*/
#define search_and_enter_local_symtab(idp) \
if ((idp = search_symtab(word_string, \
symtab_root)) == NULL) { \
idp = enter_symtab(word_string, &symtab_root); \
} \
else error(REDEFINED_IDENTIFIER)
/*--------------------------------------------------------------*/
/* search_and_enter_this_symtab Search the given symbol */
/* table for the current id */
/* name. Enter the name if */
/* it is not already in there, */
/* else ID REDEFINED error. */
/* Set a pointer to the entry. */
/*--------------------------------------------------------------*/
#define search_and_enter_this_symtab(idp, this_symtab) \
if ((idp = search_symtab(word_string, \
this_symtab)) == NULL) { \
idp = enter_symtab(word_string, &this_symtab); \
} \
else error(REDEFINED_IDENTIFIER)
#endif