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|
/* ------------------------------------------------------------------------- */
/* "symbols" : The symbols table; creating stock of reserved words */
/* */
/* Part of Inform 6.21 */
/* copyright (c) Graham Nelson 1993, 1994, 1995, 1996, 1997, 1998, 1999 */
/* */
/* ------------------------------------------------------------------------- */
#include "header.h"
/* ------------------------------------------------------------------------- */
/* This section of Inform is a service detached from the rest. */
/* Only two variables are accessible from the outside: */
/* ------------------------------------------------------------------------- */
int no_symbols; /* Total number of symbols defined */
int no_named_constants; /* Copied into story file */
/* ------------------------------------------------------------------------- */
/* Plus four arrays. Each symbol has its own index n (an int32) and */
/* */
/* svals[n] is its value (must be 32 bits wide, i.e. an int32, tho' */
/* it is used to hold an unsigned 16 bit Z-machine value) */
/* sflags[n] holds flags (see "header.h" for a list) */
/* stypes[n] is the "type", distinguishing between the data type of */
/* different kinds of constants/variables. */
/* (See the "typename()" below.) */
/* symbs[n] (needs to be cast to (char *) to be used) is the name */
/* of the symbol, in the same case form as when created. */
/* slines[n] is the source line on which the symbol value was first */
/* assigned */
/* */
/* Comparison is case insensitive. */
/* Note that local variable names are not entered into the symbols table, */
/* as their numbers and scope are too limited for this to be efficient. */
/* ------------------------------------------------------------------------- */
/* Caveat editor: some array types are set up to work even on machines */
/* where sizeof(int32 *) differs from, e.g., sizeof(char *): so do not */
/* alter the types unless you understand what is going on! */
/* ------------------------------------------------------------------------- */
int32 **symbs;
int32 *svals;
int32 *slines;
int *sflags;
#ifdef VAX
char *stypes; /* In VAX C, insanely, "signed char" is illegal */
#else
signed char *stypes;
#endif
/* ------------------------------------------------------------------------- */
/* Memory to hold the text of symbol names: note that this memory is */
/* allocated as needed in chunks of size SYMBOLS_CHUNK_SIZE. */
/* ------------------------------------------------------------------------- */
static uchar *symbols_free_space, /* Next byte free to hold new names */
*symbols_ceiling; /* Pointer to the end of the current
allocation of memory for names */
static char** symbol_name_space_chunks; /* For chunks of memory used to hold
the name strings of symbols */
static int no_symbol_name_space_chunks;
/* ------------------------------------------------------------------------- */
/* The symbols table is "hash-coded" into a disjoint union of linked */
/* lists, so that for any symbol i, next_entry[i] is either -1 (meaning */
/* that it's the last in its list) or the next in the list. */
/* */
/* Each list contains, in alphabetical order, all the symbols which share */
/* the same "hash code" (a numerical function of the text of the symbol */
/* name, designed with the aim that roughly equal numbers of symbols are */
/* given each possible hash code). The hash codes are 0 to HASH_TAB_SIZE */
/* (which is a memory setting) minus 1: start_of_list[h] gives the first */
/* symbol with hash code h, or -1 if no symbol exists with hash code h. */
/* */
/* Note that the running time of the symbol search algorithm is about */
/* */
/* O ( n^2 / HASH_TAB_SIZE ) */
/* */
/* (where n is the number of symbols in the program) so that it is a good */
/* idea to choose HASH_TAB_SIZE as large as conveniently possible. */
/* ------------------------------------------------------------------------- */
static int *next_entry;
static int32 *start_of_list;
/* ------------------------------------------------------------------------- */
/* Initialisation. */
/* ------------------------------------------------------------------------- */
static void init_symbol_banks(void)
{ int i;
for (i=0; i<HASH_TAB_SIZE; i++) start_of_list[i] = -1;
}
/* ------------------------------------------------------------------------- */
/* The hash coding we use is quite standard; the variable hashcode is */
/* expected to overflow a good deal. (The aim is to produce a number */
/* so that similar names do not produce the same number.) Note that */
/* 30011 is prime. It doesn't matter if the unsigned int to int cast */
/* behaves differently on different ports. */
/* ------------------------------------------------------------------------- */
int case_conversion_grid[128];
static void make_case_conversion_grid(void)
{
/* Assumes that A to Z are contiguous in the host OS character set:
true for ASCII but not for EBCDIC, for instance. */
int i;
for (i=0; i<128; i++) case_conversion_grid[i] = i;
for (i=0; i<26; i++) case_conversion_grid['A'+i]='a'+i;
}
extern int hash_code_from_string(char *p)
{ uint32 hashcode=0;
for (; *p; p++) hashcode=hashcode*30011 + case_conversion_grid[*p];
return (int) (hashcode % HASH_TAB_SIZE);
}
extern int strcmpcis(char *p, char *q)
{
/* Case insensitive strcmp */
int i, j, pc, qc;
for (i=0;p[i] != 0;i++)
{ pc = p[i]; if (isupper(pc)) pc = tolower(pc);
qc = q[i]; if (isupper(qc)) qc = tolower(qc);
j = pc - qc;
if (j!=0) return j;
}
qc = q[i]; if (isupper(qc)) qc = tolower(qc);
return -qc;
}
/* ------------------------------------------------------------------------- */
/* Symbol finding/creating. */
/* ------------------------------------------------------------------------- */
extern int symbol_index(char *p, int hashcode)
{
/* Return the index in the symbs/svals/sflags/stypes arrays of symbol
"p", creating a new symbol with that name if it isn't already there.
New symbols are created with fundamental type UNKNOWN_CONSTANT_FT,
value 0x100 (a 2-byte quantity in Z-machine terms) and type
CONSTANT_T.
The string "p" is undamaged. */
int32 new_entry, this, last; char *r;
if (hashcode == -1) hashcode = hash_code_from_string(p);
this = start_of_list[hashcode]; last = -1;
do
{ if (this == -1) break;
r = (char *)symbs[this];
new_entry = strcmpcis(r, p);
if (new_entry == 0) return this;
if (new_entry > 0) break;
last = this;
this = next_entry[this];
} while (this != -1);
if (no_symbols >= MAX_SYMBOLS)
memoryerror("MAX_SYMBOLS", MAX_SYMBOLS);
if (last == -1)
{ next_entry[no_symbols]=start_of_list[hashcode];
start_of_list[hashcode]=no_symbols;
}
else
{ next_entry[no_symbols]=this;
next_entry[last]=no_symbols;
}
if (symbols_free_space+strlen(p)+1 >= symbols_ceiling)
{ symbols_free_space
= my_malloc(SYMBOLS_CHUNK_SIZE, "symbol names chunk");
symbols_ceiling = symbols_free_space + SYMBOLS_CHUNK_SIZE;
symbol_name_space_chunks[no_symbol_name_space_chunks++]
= (char *) symbols_free_space;
}
strcpy((char *) symbols_free_space, p);
symbs[no_symbols] = (int32 *) symbols_free_space;
symbols_free_space += strlen((char *)symbols_free_space) + 1;
svals[no_symbols] = 0x100;
sflags[no_symbols] = UNKNOWN_SFLAG;
stypes[no_symbols] = CONSTANT_T;
slines[no_symbols] = ErrorReport.line_number
+ 0x10000*ErrorReport.file_number;
return(no_symbols++);
}
/* ------------------------------------------------------------------------- */
/* Printing diagnostics */
/* ------------------------------------------------------------------------- */
extern char *typename(int type)
{ switch(type)
{
/* These are the possible symbol types. Note that local variables
do not reside in the symbol table (for scope and efficiency
reasons) and actions have their own name-space (via routine
names with "Sub" appended). */
case ROUTINE_T: return("Routine");
case LABEL_T: return("Label");
case GLOBAL_VARIABLE_T: return("Global variable");
case ARRAY_T: return("Array");
case CONSTANT_T: return("Defined constant");
case ATTRIBUTE_T: return("Attribute");
case PROPERTY_T: return("Property");
case INDIVIDUAL_PROPERTY_T: return("Individual property");
case OBJECT_T: return("Object");
case CLASS_T: return("Class");
case FAKE_ACTION_T: return("Fake action");
default: return("(Unknown type)");
}
}
static void describe_flags(int flags)
{ if (flags & UNKNOWN_SFLAG) printf("(?) ");
if (flags & USED_SFLAG) printf("(used) ");
if (flags & REPLACE_SFLAG) printf("(Replaced) ");
if (flags & DEFCON_SFLAG) printf("(Defaulted) ");
if (flags & STUB_SFLAG) printf("(Stubbed) ");
if (flags & CHANGE_SFLAG) printf("(value will change) ");
if (flags & IMPORT_SFLAG) printf("(Imported) ");
if (flags & EXPORT_SFLAG) printf("(Exported) ");
if (flags & SYSTEM_SFLAG) printf("(System) ");
if (flags & INSF_SFLAG) printf("(created in sys file) ");
if (flags & UERROR_SFLAG) printf("('Unknown' error issued) ");
if (flags & ALIASED_SFLAG) printf("(aliased) ");
if (flags & ACTION_SFLAG) printf("(Action name) ");
if (flags & REDEFINABLE_SFLAG) printf("(Redefinable) ");
}
extern void describe_symbol(int k)
{ printf("%4d %-16s %2d:%04d %04x %s ",
k, (char *) (symbs[k]), slines[k]/0x10000, slines[k]%0x10000,
svals[k], typename(stypes[k]));
describe_flags(sflags[k]);
}
extern void list_symbols(int level)
{ int k;
for (k=0; k<no_symbols; k++)
{ if ((level==2) ||
((sflags[k] & (SYSTEM_SFLAG + UNKNOWN_SFLAG + INSF_SFLAG)) == 0))
{ describe_symbol(k); printf("\n");
}
}
}
extern void issue_unused_warnings(void)
{ int32 i;
if (module_switch) return;
i = symbol_index("Main", -1);
if (!(sflags[i] & UNKNOWN_SFLAG)) sflags[i] |= USED_SFLAG;
for (i=0;i<no_symbols;i++)
{ if (((sflags[i]
& (SYSTEM_SFLAG + UNKNOWN_SFLAG + EXPORT_SFLAG
+ INSF_SFLAG + USED_SFLAG + REPLACE_SFLAG)) == 0)
&& (stypes[i] != OBJECT_T))
dbnu_warning(typename(stypes[i]), (char *) symbs[i], slines[i]);
}
}
/* ------------------------------------------------------------------------- */
/* These are arrays used only during story file (never module) creation, */
/* and not allocated until then. */
int32 *individual_name_strings; /* Packed addresses of Z-encoded
strings of the names of the
properties: this is an array
indexed by the property ID */
int32 *action_name_strings; /* Ditto for actions */
int32 *attribute_name_strings; /* Ditto for attributes */
int32 *array_name_strings; /* Ditto for arrays */
extern void write_the_identifier_names(void)
{ int i, j, k, t, null_value; char idname_string[256];
for (i=0; i<no_individual_properties; i++)
individual_name_strings[i] = 0;
if (module_switch) return;
veneer_mode = TRUE;
null_value = compile_string("<unknown attribute>", FALSE, FALSE);
for (i=0; i<48; i++) attribute_name_strings[i] = null_value;
for (i=0; i<no_symbols; i++)
{ t=stypes[i];
if ((t == INDIVIDUAL_PROPERTY_T) || (t == PROPERTY_T))
{ if (sflags[i] & ALIASED_SFLAG)
{ if (individual_name_strings[svals[i]] == 0)
{ sprintf(idname_string, "%s", (char *) symbs[i]);
for (j=i+1, k=0; (j<no_symbols && k<3); j++)
{ if ((stypes[j] == stypes[i])
&& (svals[j] == svals[i]))
{ sprintf(idname_string+strlen(idname_string),
"/%s", (char *) symbs[j]);
k++;
}
}
if (debugfile_switch)
{ write_debug_byte(PROP_DBR);
write_debug_byte(svals[i]/256);
write_debug_byte(svals[i]%256);
write_debug_string(idname_string);
}
individual_name_strings[svals[i]]
= compile_string(idname_string, FALSE, FALSE);
}
}
else
{ sprintf(idname_string, "%s", (char *) symbs[i]);
if (debugfile_switch)
{ write_debug_byte(PROP_DBR);
write_debug_byte(svals[i]/256);
write_debug_byte(svals[i]%256);
write_debug_string(idname_string);
}
individual_name_strings[svals[i]]
= compile_string(idname_string, FALSE, FALSE);
}
}
if (t == ATTRIBUTE_T)
{ if (sflags[i] & ALIASED_SFLAG)
{ if (attribute_name_strings[svals[i]] == null_value)
{ sprintf(idname_string, "%s", (char *) symbs[i]);
for (j=i+1, k=0; (j<no_symbols && k<3); j++)
{ if ((stypes[j] == stypes[i])
&& (svals[j] == svals[i]))
{ sprintf(idname_string+strlen(idname_string),
"/%s", (char *) symbs[j]);
k++;
}
}
if (debugfile_switch)
{ write_debug_byte(ATTR_DBR);
write_debug_byte(svals[i]/256);
write_debug_byte(svals[i]%256);
write_debug_string(idname_string);
}
attribute_name_strings[svals[i]]
= compile_string(idname_string, FALSE, FALSE);
}
}
else
{ sprintf(idname_string, "%s", (char *) symbs[i]);
if (debugfile_switch)
{ write_debug_byte(ATTR_DBR);
write_debug_byte(svals[i]/256);
write_debug_byte(svals[i]%256);
write_debug_string(idname_string);
}
attribute_name_strings[svals[i]]
= compile_string(idname_string, FALSE, FALSE);
}
}
if (sflags[i] & ACTION_SFLAG)
{ sprintf(idname_string, "%s", (char *) symbs[i]);
idname_string[strlen(idname_string)-3] = 0;
if (debugfile_switch)
{ write_debug_byte(ACTION_DBR);
write_debug_byte(svals[i]/256);
write_debug_byte(svals[i]%256);
write_debug_string(idname_string);
}
action_name_strings[svals[i]]
= compile_string(idname_string, FALSE, FALSE);
}
}
for (i=0; i<no_symbols; i++)
{ if (stypes[i] == FAKE_ACTION_T)
{ sprintf(idname_string, "%s", (char *) symbs[i]);
idname_string[strlen(idname_string)-3] = 0;
if (debugfile_switch)
{ write_debug_byte(ACTION_DBR);
write_debug_byte(svals[i]/256);
write_debug_byte(svals[i]%256);
write_debug_string(idname_string);
}
action_name_strings[svals[i]
- ((grammar_version_number==1)?256:4096) + no_actions]
= compile_string(idname_string, FALSE, FALSE);
}
}
for (j=0; j<no_arrays; j++)
{ i = array_symbols[j];
sprintf(idname_string, "%s", (char *) symbs[i]);
if (debugfile_switch)
{ write_debug_byte(ARRAY_DBR);
write_debug_byte(svals[i]/256);
write_debug_byte(svals[i]%256);
write_debug_string(idname_string);
}
array_name_strings[j]
= compile_string(idname_string, FALSE, FALSE);
}
if (define_INFIX_switch)
{ for (i=0; i<no_symbols; i++)
{ if (stypes[i] == GLOBAL_VARIABLE_T)
{ sprintf(idname_string, "%s", (char *) symbs[i]);
array_name_strings[no_arrays + svals[i] -16]
= compile_string(idname_string, FALSE, FALSE);
}
}
for (i=0; i<no_named_routines; i++)
{ sprintf(idname_string, "%s", (char *) symbs[named_routine_symbols[i]]);
array_name_strings[no_arrays + no_globals + i]
= compile_string(idname_string, FALSE, FALSE);
}
for (i=0, no_named_constants=0; i<no_symbols; i++)
{ if (((stypes[i] == OBJECT_T) || (stypes[i] == CLASS_T)
|| (stypes[i] == CONSTANT_T))
&& ((sflags[i] & (UNKNOWN_SFLAG+ACTION_SFLAG))==0))
{ sprintf(idname_string, "%s", (char *) symbs[i]);
array_name_strings[no_arrays + no_globals + no_named_routines
+ no_named_constants++]
= compile_string(idname_string, FALSE, FALSE);
}
}
}
veneer_mode = FALSE;
}
/* ------------------------------------------------------------------------- */
/* Creating symbols */
/* ------------------------------------------------------------------------- */
extern int32 variable_tokens[256];
extern void assign_symbol(int index, int32 value, int type)
{ svals[index] = value;
stypes[index] = type;
if (sflags[index] & UNKNOWN_SFLAG)
{ sflags[index] &= (~UNKNOWN_SFLAG);
if (is_systemfile()) sflags[index] |= INSF_SFLAG;
slines[index] = ErrorReport.line_number
+ 0x10000*ErrorReport.file_number;
}
}
static void create_symbol(char *p, int value, int type)
{ int i = symbol_index(p, -1);
svals[i] = value; stypes[i] = type; slines[i] = 0;
sflags[i] = USED_SFLAG + SYSTEM_SFLAG;
}
static void create_rsymbol(char *p, int value, int type)
{ int i = symbol_index(p, -1);
svals[i] = value; stypes[i] = type; slines[i] = 0;
sflags[i] = USED_SFLAG + SYSTEM_SFLAG + REDEFINABLE_SFLAG;
}
static void stockup_symbols(void)
{
create_symbol("nothing", 0, OBJECT_T);
create_symbol("name", 1, PROPERTY_T);
create_symbol("true", 1, CONSTANT_T);
create_symbol("false", 0, CONSTANT_T);
create_rsymbol("Grammar__Version", 1, CONSTANT_T);
grammar_version_symbol = symbol_index("Grammar__Version", -1);
if (module_switch)
create_rsymbol("MODULE_MODE",0, CONSTANT_T);
if (runtime_error_checking_switch)
create_rsymbol("STRICT_MODE",0, CONSTANT_T);
if (define_DEBUG_switch)
create_rsymbol("DEBUG", 0, CONSTANT_T);
if (define_USE_MODULES_switch)
create_rsymbol("USE_MODULES",0, CONSTANT_T);
if (define_INFIX_switch)
{ create_rsymbol("INFIX", 0, CONSTANT_T);
create_symbol("infix__watching", 0, ATTRIBUTE_T);
}
create_symbol("temp_global", 255, GLOBAL_VARIABLE_T);
create_symbol("temp__global2", 254, GLOBAL_VARIABLE_T);
create_symbol("temp__global3", 253, GLOBAL_VARIABLE_T);
create_symbol("temp__global4", 252, GLOBAL_VARIABLE_T);
create_symbol("self", 251, GLOBAL_VARIABLE_T);
create_symbol("sender", 250, GLOBAL_VARIABLE_T);
create_symbol("sw__var", 249, GLOBAL_VARIABLE_T);
create_symbol("sys__glob0", 16, GLOBAL_VARIABLE_T);
create_symbol("sys__glob1", 17, GLOBAL_VARIABLE_T);
create_symbol("sys__glob2", 18, GLOBAL_VARIABLE_T);
create_symbol("create", 64, INDIVIDUAL_PROPERTY_T);
create_symbol("recreate", 65, INDIVIDUAL_PROPERTY_T);
create_symbol("destroy", 66, INDIVIDUAL_PROPERTY_T);
create_symbol("remaining", 67, INDIVIDUAL_PROPERTY_T);
create_symbol("copy", 68, INDIVIDUAL_PROPERTY_T);
create_symbol("call", 69, INDIVIDUAL_PROPERTY_T);
create_symbol("print", 70, INDIVIDUAL_PROPERTY_T);
create_symbol("print_to_array",71, INDIVIDUAL_PROPERTY_T);
}
/* ========================================================================= */
/* Data structure management routines */
/* ------------------------------------------------------------------------- */
extern void init_symbols_vars(void)
{
symbs = NULL;
svals = NULL;
stypes = NULL;
sflags = NULL;
next_entry = NULL;
start_of_list = NULL;
symbol_name_space_chunks = NULL;
no_symbol_name_space_chunks = 0;
symbols_free_space=NULL;
symbols_ceiling=symbols_free_space;
no_symbols = 0;
make_case_conversion_grid();
}
extern void symbols_begin_pass(void) { }
extern void symbols_allocate_arrays(void)
{
symbs = my_calloc(sizeof(char *), MAX_SYMBOLS, "symbols");
svals = my_calloc(sizeof(int32), MAX_SYMBOLS, "symbol values");
slines = my_calloc(sizeof(int32), MAX_SYMBOLS, "symbol lines");
stypes = my_calloc(sizeof(char), MAX_SYMBOLS, "symbol types");
sflags = my_calloc(sizeof(int), MAX_SYMBOLS, "symbol flags");
next_entry = my_calloc(sizeof(int), MAX_SYMBOLS,
"symbol linked-list forward links");
start_of_list = my_calloc(sizeof(int32), HASH_TAB_SIZE,
"hash code list beginnings");
symbol_name_space_chunks
= my_calloc(sizeof(char *), 100, "symbol names chunk addresses");
init_symbol_banks();
stockup_symbols();
/* Allocated during story file construction, not now */
individual_name_strings = NULL;
attribute_name_strings = NULL;
action_name_strings = NULL;
array_name_strings = NULL;
}
extern void symbols_free_arrays(void)
{ int i;
for (i=0; i<no_symbol_name_space_chunks; i++)
my_free(&(symbol_name_space_chunks[i]),
"symbol names chunk");
my_free(&symbol_name_space_chunks, "symbol names chunk addresses");
my_free(&symbs, "symbols");
my_free(&svals, "symbol values");
my_free(&slines, "symbol lines");
my_free(&stypes, "symbol types");
my_free(&sflags, "symbol flags");
my_free(&next_entry, "symbol linked-list forward links");
my_free(&start_of_list, "hash code list beginnings");
if (individual_name_strings != NULL)
my_free(&individual_name_strings, "property name strings");
if (action_name_strings != NULL)
my_free(&action_name_strings, "action name strings");
if (attribute_name_strings != NULL)
my_free(&attribute_name_strings, "attribute name strings");
if (array_name_strings != NULL)
my_free(&array_name_strings, "array name strings");
}
/* ========================================================================= */
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