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symbols.c
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/* ------------------------------------------------------------------------- */
/* "symbols" : The symbols table; creating stock of reserved words */
/* */
/* Part of Inform 6.43 */
/* copyright (c) Graham Nelson 1993 - 2024 */
/* */
/* ------------------------------------------------------------------------- */
#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 an array of symbolinfo. Each symbol has its own index n (an */
/* int32) in the array. The struct there contains: */
/* */
/* value is its value. In Z-code, this holds both the 16-bit value */
/* and the 16-bit backpatch marker, so it is an int32. */
/* marker is the backpatch marker in Glulx. */
/* flags holds flags (see "header.h" for a list of ?_SFLAGS) */
/* type is the "type", distinguishing between the data type of */
/* different kinds of constants/variables. */
/* (A ?_T constant; see the "typename()" below.) */
/* name is the name of the symbol, in the same case form as */
/* when created. */
/* line is the source line on which the symbol value was first */
/* assigned */
/* next_entry is the forward link in the symbol hash table. (See */
/* start_of_list, below.) */
/* */
/* When generating a debug file (-k switch), we also allocate an array */
/* of symboldebuginfo, which contains: */
/* */
/* backpatch_pos */
/* is a file position in the debug information file where */
/* the symbol's value should be written after backpatching, */
/* or else the null position if the value was known and */
/* written beforehand */
/* replacement_backpatch_pos */
/* is a file position in the debug information file where */
/* the symbol's name can be erased if it is replaced, or */
/* else null if the name will never need to be replaced */
/* */
/* 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. */
/* ------------------------------------------------------------------------- */
symbolinfo *symbols; /* Allocated up to no_symbols */
static memory_list symbols_memlist;
symboldebuginfo *symbol_debug_info; /* Allocated up to no_symbols */
static memory_list symbol_debug_info_memlist;
static char *temp_symbol_buf; /* used in write_the_identifier_names() */
static memory_list temp_symbol_buf_memlist;
/* ------------------------------------------------------------------------- */
/* Memory to hold the text of symbol names: note that this memory is */
/* allocated as needed in chunks of size SYMBOLS_CHUNK_SIZE. (Or */
/* larger, if needed for a particularly enormous symbol.) */
/* ------------------------------------------------------------------------- */
#define SYMBOLS_CHUNK_SIZE (4096)
static char *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;
static memory_list symbol_name_space_chunks_memlist;
/* Symbol replacements (used by the "Replace X Y" directive). */
typedef struct value_pair_struct {
int original_symbol;
int renamed_symbol;
} value_pair_t;
static value_pair_t *symbol_replacements;
static int symbol_replacements_count;
static int symbol_replacements_size; /* calloced size */
/* Symbol definitions requested at compile time. (There may not be any.)
These are set up at command-line parse time, not in init_symbols_vars().
Similarly, they are not cleaned up by symbols_free_arrays(). */
typedef struct keyvalue_pair_struct {
char *symbol;
int32 value;
} keyvalue_pair_t;
static keyvalue_pair_t *symbol_definitions = NULL;
static int symbol_definitions_count = 0;
static int symbol_definitions_size = 0; /* calloced size */
/* ------------------------------------------------------------------------- */
/* 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 int32 *start_of_list; /* Allocated array of size HASH_TAB_SIZE */
/* The next_entry field is part of the symbolinfo struct. */
/* ------------------------------------------------------------------------- */
/* 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[(uchar)*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;
}
/* ------------------------------------------------------------------------- */
extern void add_config_symbol_definition(char *symbol, int32 value)
{ char *str;
if (symbol_definitions_count == symbol_definitions_size) {
int oldsize = symbol_definitions_size;
if (symbol_definitions_size == 0)
symbol_definitions_size = 4;
else
symbol_definitions_size *= 2;
my_recalloc(&symbol_definitions, sizeof(keyvalue_pair_t), oldsize,
symbol_definitions_size, "symbol definition table");
}
str = my_malloc(strlen(symbol)+1, "symbol name");
strcpy(str, symbol);
symbol_definitions[symbol_definitions_count].symbol = str;
symbol_definitions[symbol_definitions_count].value = value;
symbol_definitions_count++;
}
/* ------------------------------------------------------------------------- */
/* Symbol finding, creating, and removing. */
/* ------------------------------------------------------------------------- */
extern int get_symbol_index(char *p)
{
/* Return the index in the symbols array of symbol "p", or -1
if it isn't there. Does not create a new symbol or mark the
symbol as used. */
int32 new_entry, this;
char *r;
int hashcode = hash_code_from_string(p);
this = start_of_list[hashcode];
do
{ if (this == -1) break;
r = symbols[this].name;
new_entry = strcmpcis(r, p);
if (new_entry == 0)
{
return this;
}
if (new_entry > 0) break;
this = symbols[this].next_entry;
} while (this != -1);
return -1;
}
extern int symbol_index(char *p, int hashcode, int *created)
{
/* Return the index in the symbols array of symbol "p", creating a
new symbol with that name if it isn't already there. This
always returns a valid symbol index.
The optional created argument receives TRUE if the symbol
was newly created.
Pass in the hashcode of p if you know it, or -1 if you don't.
New symbols are created with flag UNKNOWN_SFLAG, 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;
int len;
if (hashcode == -1) hashcode = hash_code_from_string(p);
this = start_of_list[hashcode]; last = -1;
do
{ if (this == -1) break;
r = symbols[this].name;
new_entry = strcmpcis(r, p);
if (new_entry == 0)
{
if (track_unused_routines)
df_note_function_symbol(this);
if (created) *created = FALSE;
return this;
}
if (new_entry > 0) break;
last = this;
this = symbols[this].next_entry;
} while (this != -1);
if (symdef_trace_setting)
printf("%s: Encountered symbol %d '%s'\n", current_location_text(), no_symbols, p);
ensure_memory_list_available(&symbols_memlist, no_symbols+1);
if (debugfile_switch)
ensure_memory_list_available(&symbol_debug_info_memlist, no_symbols+1);
if (last == -1)
{ symbols[no_symbols].next_entry=start_of_list[hashcode];
start_of_list[hashcode]=no_symbols;
}
else
{ symbols[no_symbols].next_entry=this;
symbols[last].next_entry=no_symbols;
}
len = strlen(p);
if (!symbols_free_space || symbols_free_space+len+1 >= symbols_ceiling)
{
/* Allocate a new chunk whose size is big enough for the current
symbol, or SYMBOLS_CHUNK_SIZE, whichever is greater. */
int chunklen = SYMBOLS_CHUNK_SIZE;
if (chunklen < len+1)
chunklen = len+1;
symbols_free_space
= my_malloc(chunklen, "symbol names chunk");
symbols_ceiling = symbols_free_space + chunklen;
ensure_memory_list_available(&symbol_name_space_chunks_memlist, no_symbol_name_space_chunks+1);
symbol_name_space_chunks[no_symbol_name_space_chunks++]
= symbols_free_space;
}
strcpy(symbols_free_space, p);
symbols[no_symbols].name = symbols_free_space;
symbols_free_space += (len+1);
symbols[no_symbols].value = 0x100; /* ###-wrong? Would this fix the
unbound-symbol-causes-asm-error? */
symbols[no_symbols].flags = UNKNOWN_SFLAG;
symbols[no_symbols].marker = 0;
symbols[no_symbols].type = CONSTANT_T;
symbols[no_symbols].line = get_brief_location(&ErrorReport);
if (debugfile_switch)
{ nullify_debug_file_position
(&symbol_debug_info[no_symbols].backpatch_pos);
nullify_debug_file_position
(&symbol_debug_info[no_symbols].replacement_backpatch_pos);
}
if (track_unused_routines)
df_note_function_symbol(no_symbols);
if (created) *created = TRUE;
return(no_symbols++);
}
extern void end_symbol_scope(int k, int neveruse)
{
/* Remove the given symbol from the hash table, making it
invisible to symbol_index. This is used by the Undef directive
and put_token_back().
If you know the symbol has never been used, set neveruse and
it will be flagged as an error if it *is* used.
If the symbol is not found in the hash table, this silently does
nothing.
*/
int j;
symbols[k].flags |= UNHASHED_SFLAG;
if (neveruse)
symbols[k].flags |= DISCARDED_SFLAG;
j = hash_code_from_string(symbols[k].name);
if (start_of_list[j] == k)
{ start_of_list[j] = symbols[k].next_entry;
return;
}
j = start_of_list[j];
while (j != -1)
{
if (symbols[j].next_entry == k)
{ symbols[j].next_entry = symbols[k].next_entry;
return;
}
j = symbols[j].next_entry;
}
}
/* ------------------------------------------------------------------------- */
/* 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 STATIC_ARRAY_T: return("Static 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");
/* These are not symbol types, but they get printed in errors. */
case STRING_REQ_T: return("String");
case DICT_WORD_REQ_T: return("Dictionary word");
default: return("(Unknown type)");
}
}
static void describe_flags(int flags)
{ if (flags & UNKNOWN_SFLAG) printf("(?) ");
if (flags & REPLACE_SFLAG) printf("(Replaced) ");
if (flags & USED_SFLAG) printf("(used) ");
if (flags & DEFCON_SFLAG) printf("(Defaulted) ");
if (flags & STUB_SFLAG) printf("(Stubbed) ");
if (flags & UNHASHED_SFLAG) printf("(not in hash chain) ");
if (flags & DISCARDED_SFLAG) printf("(removed, do not use) ");
if (flags & ALIASED_SFLAG) printf("(aliased) ");
if (flags & CHANGE_SFLAG) printf("(value will change) ");
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 & ACTION_SFLAG) printf("(Action name) ");
if (flags & REDEFINABLE_SFLAG) printf("(Redefinable) ");
if (flags & STAR_SFLAG) printf("(*) ");
}
extern void describe_symbol(int k)
{ printf("%4d %-16s %2d:%04d %04x %s ",
k, (symbols[k].name),
(int)(symbols[k].line.file_index),
(int)(symbols[k].line.line_number),
symbols[k].value, typename(symbols[k].type));
describe_flags(symbols[k].flags);
}
extern void list_symbols(int level)
{ int k;
for (k=0; k<no_symbols; k++)
{ if ((level>=2) ||
((symbols[k].flags & (SYSTEM_SFLAG + UNKNOWN_SFLAG + INSF_SFLAG)) == 0))
{ describe_symbol(k); printf("\n");
}
}
}
/* Check that the operand is of the given symbol type (XXX_T). If wanttype2 is nonzero, that's a second allowable type.
Generate a warning if no match. */
extern void check_warn_symbol_type(const assembly_operand *AO, int wanttype, int wanttype2, char *context)
{
symbolinfo *sym;
int symtype;
if (AO->symindex < 0)
{
/* This argument is not a symbol; it's a local variable, a literal, or a computed expression. */
/* We can recognize and type-check some literals. */
if (AO->marker == DWORD_MV) {
if (wanttype != DICT_WORD_REQ_T && wanttype2 != DICT_WORD_REQ_T)
symtype_warning(context, NULL, typename(DICT_WORD_REQ_T), typename(wanttype));
}
if (AO->marker == STRING_MV) {
if (wanttype != STRING_REQ_T && wanttype2 != STRING_REQ_T)
symtype_warning(context, NULL, typename(STRING_REQ_T), typename(wanttype));
}
return;
}
sym = &symbols[AO->symindex];
symtype = sym->type;
if (symtype == GLOBAL_VARIABLE_T)
{
/* A global variable could have any value. No way to generate a warning. */
return;
}
if (symtype == CONSTANT_T)
{
/* A constant could also have any value. This case also includes forward-declared constants (UNKNOWN_SFLAG). */
/* We try inferring its type by looking at the backpatch marker. Sadly, this only works for objects. (And not in Z-code, where object values are not backpatched.) */
if (sym->marker == OBJECT_MV) {
/* Continue with inferred type. */
symtype = OBJECT_T;
}
else {
/* Give up. */
return;
}
}
if (!( (symtype == wanttype)
|| (wanttype2 != 0 && symtype == wanttype2)))
{
symtype_warning(context, sym->name, typename(symtype), typename(wanttype));
}
}
/* Similar, but we allow any type that has a metaclass: Object, Class, String, or Routine.
Generate a warning if no match. */
extern void check_warn_symbol_has_metaclass(const assembly_operand *AO, char *context)
{
symbolinfo *sym;
int symtype;
if (AO->symindex < 0)
{
/* This argument is not a symbol; it's a local variable, a literal, or a computed expression. */
/* We can recognize and type-check some literals. */
if (AO->marker == DWORD_MV) {
symtype_warning(context, NULL, typename(DICT_WORD_REQ_T), "Object/Class/Routine/String");
}
if (AO->marker == STRING_MV) {
/* Strings are good here. */
}
return;
}
sym = &symbols[AO->symindex];
symtype = sym->type;
if (symtype == GLOBAL_VARIABLE_T)
{
/* A global variable could have any value. No way to generate a warning. */
return;
}
if (symtype == CONSTANT_T)
{
/* A constant could also have any value. This case also includes forward-declared constants (UNKNOWN_SFLAG). */
/* We try inferring its type by looking at the backpatch marker. Sadly, this only works for objects. (And not in Z-code, where object values are not backpatched.) */
if (sym->marker == OBJECT_MV) {
/* Continue with inferred type. */
symtype = OBJECT_T;
}
else {
/* Give up. */
return;
}
}
if (!(symtype == ROUTINE_T || symtype == CLASS_T || symtype == OBJECT_T))
{
symtype_warning(context, sym->name, typename(symtype), "Object/Class/Routine/String");
}
}
extern void issue_unused_warnings(void)
{ int32 i;
/* Update any ad-hoc variables that might help the library */
if (glulx_mode)
{ global_initial_value[10]=statusline_flag;
}
/* Now back to mark anything necessary as used */
i = get_symbol_index("Main");
if (i >= 0 && !(symbols[i].flags & UNKNOWN_SFLAG)) {
symbols[i].flags |= USED_SFLAG;
}
for (i=0;i<no_symbols;i++)
{ if (((symbols[i].flags
& (SYSTEM_SFLAG + UNKNOWN_SFLAG
+ INSF_SFLAG + USED_SFLAG + REPLACE_SFLAG)) == 0)
&& (symbols[i].type != OBJECT_T)) {
dbnu_warning(typename(symbols[i].type), symbols[i].name, symbols[i].line);
}
if ((symbols[i].flags & DISCARDED_SFLAG)
&& (symbols[i].flags & USED_SFLAG)) {
error_named_at("Symbol was removed from the symbol table, but seems to be in use anyway", symbols[i].name, symbols[i].line);
}
}
}
extern void issue_debug_symbol_warnings(void)
{
int value = get_symbol_index("DEBUG");
if (value >= 0 && (symbols[value].flags & USED_SFLAG) && !(symbols[value].flags & UNKNOWN_SFLAG)) {
value = get_symbol_index("debug_flag");
if (value >= 0 && (symbols[value].flags & USED_SFLAG) && (symbols[value].flags & UNKNOWN_SFLAG)) {
warning("DEBUG mode is on, but this story or library does not appear to support it");
}
}
}
/* ------------------------------------------------------------------------- */
/* These are arrays used only during story file creation, and not */
/* allocated until just before write_the_identifier_names() time. */
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 and fake 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;
static char unknown_attribute[20] = "<unknown attribute>";
for (i=0; i<no_individual_properties; i++)
individual_name_strings[i] = 0;
veneer_mode = TRUE;
null_value = compile_string(unknown_attribute, STRCTX_SYMBOL);
for (i=0; i<NUM_ATTR_BYTES*8; i++) attribute_name_strings[i] = null_value;
for (i=0; i<no_symbols; i++)
{ t=symbols[i].type;
if ((t == INDIVIDUAL_PROPERTY_T) || (t == PROPERTY_T))
{ if (symbols[i].flags & ALIASED_SFLAG)
{ if (individual_name_strings[symbols[i].value] == 0)
{
int sleni = strlen(symbols[i].name);
ensure_memory_list_available(&temp_symbol_buf_memlist, sleni+1);
sprintf(temp_symbol_buf, "%s", symbols[i].name);
for (j=i+1, k=0; (j<no_symbols && k<3); j++)
{ if ((symbols[j].type == symbols[i].type)
&& (symbols[j].value == symbols[i].value))
{
int slenj = strlen(symbols[j].name);
ensure_memory_list_available(&temp_symbol_buf_memlist, strlen(temp_symbol_buf)+1+slenj+1);
sprintf(temp_symbol_buf+strlen(temp_symbol_buf),
"/%s", symbols[j].name);
k++;
}
}
individual_name_strings[symbols[i].value]
= compile_string(temp_symbol_buf, STRCTX_SYMBOL);
}
}
else
{
individual_name_strings[symbols[i].value]
= compile_string(symbols[i].name, STRCTX_SYMBOL);
}
}
if (t == ATTRIBUTE_T)
{
if (symbols[i].flags & ALIASED_SFLAG)
{ if (attribute_name_strings[symbols[i].value] == null_value)
{
int sleni = strlen(symbols[i].name);
ensure_memory_list_available(&temp_symbol_buf_memlist, sleni+1);
sprintf(temp_symbol_buf, "%s", symbols[i].name);
for (j=i+1, k=0; (j<no_symbols && k<3); j++)
{ if ((symbols[j].type == symbols[i].type)
&& (symbols[j].value == symbols[i].value))
{
int slenj = strlen(symbols[j].name);
ensure_memory_list_available(&temp_symbol_buf_memlist, strlen(temp_symbol_buf)+1+slenj+1);
sprintf(temp_symbol_buf+strlen(temp_symbol_buf),
"/%s", symbols[j].name);
k++;
}
}
attribute_name_strings[symbols[i].value]
= compile_string(temp_symbol_buf, STRCTX_SYMBOL);
}
}
else
{
attribute_name_strings[symbols[i].value]
= compile_string(symbols[i].name, STRCTX_SYMBOL);
}
}
if (symbols[i].flags & ACTION_SFLAG)
{
int sleni = strlen(symbols[i].name);
ensure_memory_list_available(&temp_symbol_buf_memlist, sleni+1);
sprintf(temp_symbol_buf, "%s", symbols[i].name);
temp_symbol_buf[strlen(temp_symbol_buf)-3] = 0;
if (debugfile_switch)
{ debug_file_printf("<action>");
debug_file_printf
("<identifier>##%s</identifier>", temp_symbol_buf);
debug_file_printf("<value>%d</value>", symbols[i].value);
debug_file_printf("</action>");
}
action_name_strings[symbols[i].value]
= compile_string(temp_symbol_buf, STRCTX_SYMBOL);
}
}
for (i=0; i<no_symbols; i++)
{ if (symbols[i].type == FAKE_ACTION_T)
{
int sleni = strlen(symbols[i].name);
ensure_memory_list_available(&temp_symbol_buf_memlist, sleni+1);
sprintf(temp_symbol_buf, "%s", symbols[i].name);
temp_symbol_buf[strlen(temp_symbol_buf)-3] = 0;
action_name_strings[symbols[i].value
- lowest_fake_action() + no_actions]
= compile_string(temp_symbol_buf, STRCTX_SYMBOL);
}
}
for (j=0; j<no_arrays; j++)
{
i = arrays[j].symbol;
array_name_strings[j]
= compile_string(symbols[i].name, STRCTX_SYMBOL);
}
if (define_INFIX_switch)
{
for (i=0; i<no_symbols; i++)
{ if (symbols[i].type == GLOBAL_VARIABLE_T)
{
array_name_strings[no_arrays + symbols[i].value -16]
= compile_string(symbols[i].name, STRCTX_SYMBOL);
}
}
for (i=0; i<no_named_routines; i++)
{
array_name_strings[no_arrays + no_globals + i]
= compile_string(symbols[named_routine_symbols[i]].name, STRCTX_SYMBOL);
}
for (i=0, no_named_constants=0; i<no_symbols; i++)
{ if (((symbols[i].type == OBJECT_T) || (symbols[i].type == CLASS_T)
|| (symbols[i].type == CONSTANT_T))
&& ((symbols[i].flags & (UNKNOWN_SFLAG+ACTION_SFLAG))==0))
{
array_name_strings[no_arrays + no_globals + no_named_routines
+ no_named_constants++]
= compile_string(symbols[i].name, STRCTX_SYMBOL);
}
}
}
veneer_mode = FALSE;
}
/* ------------------------------------------------------------------------- */
/* Creating symbols */
/* ------------------------------------------------------------------------- */
static void assign_symbol_base(int index, int32 value, int type)
{ symbols[index].value = value;
symbols[index].type = type;
if (symbols[index].flags & UNKNOWN_SFLAG)
{ symbols[index].flags &= (~UNKNOWN_SFLAG);
if (is_systemfile()) symbols[index].flags |= INSF_SFLAG;
symbols[index].line = get_brief_location(&ErrorReport);
}
}
extern void assign_symbol(int index, int32 value, int type)
{
assign_symbol_base(index, value, type);
symbols[index].marker = 0;
if (symdef_trace_setting)
printf("%s: Defined symbol %d '%s' as %d (%s)\n", current_location_text(), index, symbols[index].name, value, typename(type));
}
extern void assign_marked_symbol(int index, int marker, int32 value, int type)
{
assign_symbol_base(index, value, type);
symbols[index].marker = marker;
if (symdef_trace_setting)
printf("%s: Defined symbol %d '%s' as %s %d (%s)\n", current_location_text(), index, symbols[index].name, describe_mv(marker), value, typename(type));
}
static void emit_debug_information_for_predefined_symbol
(char *name, int32 symbol, int32 value, int type)
{ if (debugfile_switch)
{ switch (type)
{ case CONSTANT_T:
debug_file_printf("<constant>");
debug_file_printf("<identifier>%s</identifier>", name);
write_debug_symbol_optional_backpatch(symbol);
debug_file_printf("</constant>");
break;
case GLOBAL_VARIABLE_T:
debug_file_printf("<global-variable>");
debug_file_printf("<identifier>%s</identifier>", name);
debug_file_printf("<address>");
write_debug_global_backpatch(value);
debug_file_printf("</address>");
debug_file_printf("</global-variable>");
break;
case OBJECT_T:
if (value)
{ compiler_error("Non-nothing object predefined");
}
debug_file_printf("<object>");
debug_file_printf("<identifier>%s</identifier>", name);
debug_file_printf("<value>0</value>");
debug_file_printf("</object>");
break;
case ATTRIBUTE_T:
debug_file_printf("<attribute>");
debug_file_printf("<identifier>%s</identifier>", name);
debug_file_printf("<value>%d</value>", value);
debug_file_printf("</attribute>");
break;
case PROPERTY_T:
case INDIVIDUAL_PROPERTY_T:
debug_file_printf("<property>");
debug_file_printf("<identifier>%s</identifier>", name);
debug_file_printf("<value>%d</value>", value);
debug_file_printf("</property>");
break;
default:
compiler_error
("Unable to emit debug information for predefined symbol");
break;
}
}
}
static void create_symbol(char *p, int32 value, int type)
{ int i = symbol_index(p, -1, NULL);
if (!(symbols[i].flags & (UNKNOWN_SFLAG + REDEFINABLE_SFLAG))) {
/* Symbol already defined! */
if (symbols[i].value == value && symbols[i].type == type) {
/* Special case: the symbol was already defined with this same
value. We let it pass. */
return;
}
else {
ebf_symbol_error("new symbol", p, typename(symbols[i].type), symbols[i].line);
return;
}
}
symbols[i].value = value; symbols[i].type = type; symbols[i].line = blank_brief_location;
/* If the symbol already existed with REDEFINABLE_SFLAG, we keep that. */
symbols[i].flags = USED_SFLAG + SYSTEM_SFLAG + (symbols[i].flags & REDEFINABLE_SFLAG);
emit_debug_information_for_predefined_symbol(p, i, value, type);
}
static void create_rsymbol(char *p, int value, int type)
{ int i = symbol_index(p, -1, NULL);
/* This is only called for a few symbols with known names.
They will not collide. */
symbols[i].value = value; symbols[i].type = type; symbols[i].line = blank_brief_location;
symbols[i].flags = USED_SFLAG + SYSTEM_SFLAG + REDEFINABLE_SFLAG;
emit_debug_information_for_predefined_symbol(p, i, value, type);
}
static void stockup_symbols(void)
{
if (!glulx_mode)
create_symbol("TARGET_ZCODE", 0, CONSTANT_T);
else
create_symbol("TARGET_GLULX", 0, CONSTANT_T);
create_symbol("nothing", 0, OBJECT_T);
create_symbol("name", 1, PROPERTY_T);
create_symbol("true", 1, CONSTANT_T);
create_symbol("false", 0, CONSTANT_T);
/* Glulx defaults to GV2; Z-code to GV1. These may be modified by
command-line options, but we haven't applied that change yet. */
create_rsymbol("Grammar__Version", grammar_version_number, CONSTANT_T);
grammar_version_symbol = get_symbol_index("Grammar__Version");
if (runtime_error_checking_switch)
create_rsymbol("STRICT_MODE",0, CONSTANT_T);
if (define_DEBUG_switch)
create_rsymbol("DEBUG", 0, CONSTANT_T);
if (define_INFIX_switch)
{ create_rsymbol("INFIX", 0, CONSTANT_T);
create_symbol("infix__watching", 0, ATTRIBUTE_T);
}
if (OMIT_SYMBOL_TABLE)
create_symbol("OMIT_SYMBOL_TABLE", 0, CONSTANT_T);
if (GRAMMAR_META_FLAG)
create_symbol("GRAMMAR_META_FLAG", 0, CONSTANT_T);
create_symbol("WORDSIZE", WORDSIZE, CONSTANT_T);
/* DICT_ENTRY_BYTES must be REDEFINABLE_SFLAG because the Version directive can change it. */
create_rsymbol("DICT_ENTRY_BYTES", DICT_ENTRY_BYTE_LENGTH, CONSTANT_T);
if (!glulx_mode) {
create_symbol("DICT_WORD_SIZE", ((version_number==3)?4:6), CONSTANT_T);
create_symbol("NUM_ATTR_BYTES", ((version_number==3)?4:6), CONSTANT_T);
}
else {
create_symbol("DICT_WORD_SIZE", DICT_WORD_SIZE, CONSTANT_T);
create_symbol("DICT_CHAR_SIZE", DICT_CHAR_SIZE, CONSTANT_T);
if (DICT_CHAR_SIZE != 1)
create_symbol("DICT_IS_UNICODE", 1, CONSTANT_T);
create_symbol("NUM_ATTR_BYTES", NUM_ATTR_BYTES, CONSTANT_T);
create_symbol("GOBJFIELD_CHAIN", GOBJFIELD_CHAIN(), CONSTANT_T);
create_symbol("GOBJFIELD_NAME", GOBJFIELD_NAME(), CONSTANT_T);
create_symbol("GOBJFIELD_PROPTAB", GOBJFIELD_PROPTAB(), CONSTANT_T);
create_symbol("GOBJFIELD_PARENT", GOBJFIELD_PARENT(), CONSTANT_T);
create_symbol("GOBJFIELD_SIBLING", GOBJFIELD_SIBLING(), CONSTANT_T);
create_symbol("GOBJFIELD_CHILD", GOBJFIELD_CHILD(), CONSTANT_T);
create_symbol("GOBJ_EXT_START", 1+NUM_ATTR_BYTES+6*WORDSIZE, CONSTANT_T);
create_symbol("GOBJ_TOTAL_LENGTH", 1+NUM_ATTR_BYTES+6*WORDSIZE+GLULX_OBJECT_EXT_BYTES, CONSTANT_T);
create_symbol("INDIV_PROP_START", INDIV_PROP_START, CONSTANT_T);
}
if (!glulx_mode) {
create_symbol("temp_global", globalv_z_temp_var1, GLOBAL_VARIABLE_T);
create_symbol("temp__global2", globalv_z_temp_var2, GLOBAL_VARIABLE_T);
create_symbol("temp__global3", globalv_z_temp_var3, GLOBAL_VARIABLE_T);
create_symbol("temp__global4", globalv_z_temp_var4, GLOBAL_VARIABLE_T);
create_symbol("self", globalv_z_self, GLOBAL_VARIABLE_T);
create_symbol("sender", globalv_z_sender, GLOBAL_VARIABLE_T);
create_symbol("sw__var", globalv_z_sw__var, GLOBAL_VARIABLE_T);
/* These three are always the first three Z-machine globals,
which are significant in v3 (but not any later version). */
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);
}
else {
/* In Glulx, these system globals are entered in order, not down
from 255. */
create_symbol("temp_global", MAX_LOCAL_VARIABLES+0,
GLOBAL_VARIABLE_T);
create_symbol("temp__global2", MAX_LOCAL_VARIABLES+1,
GLOBAL_VARIABLE_T);
create_symbol("temp__global3", MAX_LOCAL_VARIABLES+2,
GLOBAL_VARIABLE_T);
create_symbol("temp__global4", MAX_LOCAL_VARIABLES+3,
GLOBAL_VARIABLE_T);
create_symbol("self", MAX_LOCAL_VARIABLES+4,
GLOBAL_VARIABLE_T);
create_symbol("sender", MAX_LOCAL_VARIABLES+5,
GLOBAL_VARIABLE_T);
create_symbol("sw__var", MAX_LOCAL_VARIABLES+6,
GLOBAL_VARIABLE_T);
/* These are almost certainly meaningless, and can be removed. */
create_symbol("sys__glob0", MAX_LOCAL_VARIABLES+7,
GLOBAL_VARIABLE_T);
create_symbol("sys__glob1", MAX_LOCAL_VARIABLES+8,
GLOBAL_VARIABLE_T);
create_symbol("sys__glob2", MAX_LOCAL_VARIABLES+9,
GLOBAL_VARIABLE_T);
/* value of statusline_flag to be written later */
create_symbol("sys_statusline_flag", MAX_LOCAL_VARIABLES+10,
GLOBAL_VARIABLE_T);
/* These are created in order, but not necessarily at a fixed
value. */
create_symbol("create", INDIV_PROP_START+0,
INDIVIDUAL_PROPERTY_T);
create_symbol("recreate", INDIV_PROP_START+1,
INDIVIDUAL_PROPERTY_T);
create_symbol("destroy", INDIV_PROP_START+2,
INDIVIDUAL_PROPERTY_T);
create_symbol("remaining", INDIV_PROP_START+3,
INDIVIDUAL_PROPERTY_T);
create_symbol("copy", INDIV_PROP_START+4,
INDIVIDUAL_PROPERTY_T);
create_symbol("call", INDIV_PROP_START+5,
INDIVIDUAL_PROPERTY_T);
create_symbol("print", INDIV_PROP_START+6,
INDIVIDUAL_PROPERTY_T);
create_symbol("print_to_array",INDIV_PROP_START+7,
INDIVIDUAL_PROPERTY_T);
/* Floating-point constants. Note that FLOAT_NINFINITY is not
-FLOAT_INFINITY, because float negation doesn't work that
way. Also note that FLOAT_NAN is just one of many possible
"not-a-number" values. */
create_symbol("FLOAT_INFINITY", 0x7F800000, CONSTANT_T);
create_symbol("FLOAT_NINFINITY", 0xFF800000, CONSTANT_T);
create_symbol("FLOAT_NAN", 0x7FC00000, CONSTANT_T);
/* Same for double constants. Each of these has a high 32-bit
word and a low 32-bit word. */
create_symbol("DOUBLE_HI_INFINITY", 0x7FF00000, CONSTANT_T);
create_symbol("DOUBLE_LO_INFINITY", 0x00000000, CONSTANT_T);
create_symbol("DOUBLE_HI_NINFINITY", 0xFFF00000, CONSTANT_T);
create_symbol("DOUBLE_LO_NINFINITY", 0x00000000, CONSTANT_T);
create_symbol("DOUBLE_HI_NAN", 0x7FF80000, CONSTANT_T);
create_symbol("DOUBLE_LO_NAN", 0x00000001, CONSTANT_T);
}
if (symbol_definitions && symbol_definitions_count) {
int ix;
for (ix=0; ix<symbol_definitions_count; ix++) {
char *str = symbol_definitions[ix].symbol;
int32 val = symbol_definitions[ix].value;
create_symbol(str, val, CONSTANT_T);
}
}
}
/* ------------------------------------------------------------------------- */
/* The symbol replacement table. This is needed only for the */
/* "Replace X Y" directive. */
/* ------------------------------------------------------------------------- */
extern void add_symbol_replacement_mapping(int original, int renamed)