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#include "m4private.h" |
#include "m4private.h" |
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/* Initialise the symbol table, by allocating the necessary storage, and |
static size_t m4_symtab_hash (const void *key); |
36 |
zeroing all the entries. */ |
static int m4_symtab_cmp (const void *key, const void *try); |
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static void m4_token_data_delete (m4_token_data *data); |
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static void m4_symbol_popdef (m4_symbol *symbol); |
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static void m4_symbol_delete (m4_symbol *symbol); |
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/* Pointer to symbol table. */ |
/* Pointer to symbol table. */ |
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m4_symbol **m4_symtab; |
m4_hash *m4_symtab = 0; |
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void |
void |
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m4_symtab_init (void) |
m4_symtab_init (void) |
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{ |
{ |
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int i; |
m4_symtab = m4_hash_new (m4_symtab_hash, m4_symtab_cmp); |
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m4_symbol **symbol; |
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symbol = m4_symtab = XMALLOC (m4_symbol *, hash_table_size); |
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for (i = hash_table_size; --i >= 0;) |
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*symbol++ = NULL; |
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} |
} |
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/* Return a hashvalue for a string, from GNU-emacs. */ |
/* Return a hashvalue for a string, from GNU-emacs. */ |
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static int |
size_t |
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hash (const char *s) |
m4_symtab_hash (const void *key) |
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{ |
{ |
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register int val = 0; |
int val = 0; |
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const char *ptr = (const char *) key; |
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register const char *ptr = s; |
char ch; |
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register char ch; |
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while ((ch = *ptr++) != '\0') |
while ((ch = *ptr++) != '\0') |
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{ |
{ |
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val = ((val << 3) + (val >> 28) + ch); |
val = ((val << 3) + (val >> 28) + ch); |
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}; |
}; |
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val = (val < 0) ? -val : val; |
val = (val < 0) ? -val : val; |
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return val % hash_table_size; |
return val; |
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} |
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int |
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m4_symtab_cmp (const void *key, const void *try) |
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{ |
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return (strcmp ((const char *) key, (const char *) try)); |
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} |
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void |
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m4_token_data_delete (m4_token_data *data) |
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{ |
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assert (data); |
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assert (M4_TOKEN_DATA_NEXT (data) == 0); |
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if (M4_TOKEN_DATA_TYPE (data) == M4_TOKEN_TEXT) |
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XFREE (M4_TOKEN_DATA_TEXT (data)); |
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XFREE (data); |
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} |
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void |
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m4_symbol_popdef (m4_symbol *symbol) |
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{ |
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m4_token_data *stale; |
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assert (symbol); |
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assert (M4_SYMBOL_DATA_NEXT (symbol)); |
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stale = M4_SYMBOL_DATA (symbol); |
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M4_SYMBOL_DATA (symbol) = M4_TOKEN_DATA_NEXT (stale); |
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#ifndef NDEBUG |
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M4_TOKEN_DATA_NEXT (stale) = 0; |
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#endif |
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m4_token_data_delete (stale); |
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} |
} |
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/* Free all storage associated with a symbol. */ |
/* Free all storage associated with a symbol. */ |
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static void |
void |
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free_symbol (m4_symbol *symbol) |
m4_symbol_delete (m4_symbol *symbol) |
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{ |
{ |
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if (M4_SYMBOL_NAME (symbol)) |
assert (symbol); |
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xfree (M4_SYMBOL_NAME (symbol)); |
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while (M4_SYMBOL_DATA_NEXT (symbol)) |
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m4_symbol_popdef (symbol); |
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assert (M4_SYMBOL_DATA_NEXT (symbol) == 0); |
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if (M4_SYMBOL_TYPE (symbol) == M4_TOKEN_TEXT) |
if (M4_SYMBOL_TYPE (symbol) == M4_TOKEN_TEXT) |
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xfree (M4_SYMBOL_TEXT (symbol)); |
XFREE (M4_SYMBOL_TEXT (symbol)); |
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xfree ((void *) symbol); |
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XFREE (M4_SYMBOL_DATA (symbol)); |
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XFREE (symbol); |
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} |
} |
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/* Search in, and manipulation of the symbol table, are all done by |
/* Search in, and manipulation of the symbol table, are all done by |
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m4_symbol * |
m4_symbol * |
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m4_lookup_symbol (const char *name, m4_symbol_lookup mode) |
m4_lookup_symbol (const char *name, m4_symbol_lookup mode) |
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{ |
{ |
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if (mode != M4_SYMBOL_IGNORE) |
if (mode == M4_SYMBOL_IGNORE) |
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{ |
return 0; |
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int cmp = 1; |
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int h = hash (name); |
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m4_symbol *symbol = m4_symtab[h]; |
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m4_symbol **spp, *prev; |
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for (prev = NULL; symbol != NULL; prev = symbol, symbol = symbol->next) |
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{ |
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cmp = strcmp (M4_SYMBOL_NAME (symbol), name); |
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if (cmp >= 0) |
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break; |
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} |
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/* If just searching, return status of search. */ |
{ |
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m4_symbol **psymbol = (m4_symbol **) m4_hash_lookup (m4_symtab, name); |
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if (mode == M4_SYMBOL_LOOKUP) |
switch (mode) |
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return cmp == 0 ? symbol : NULL; |
{ |
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case M4_SYMBOL_LOOKUP: |
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/* Symbol not found. */ |
/* If just searching, return status of search. */ |
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return psymbol ? *psymbol : 0; |
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spp = (prev != NULL) ? &prev->next : &m4_symtab[h]; |
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case M4_SYMBOL_INSERT: |
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switch (mode) |
/* Return the symbol, if the name was found in the table. |
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Otherwise, just insert the name, and return the new symbol. */ |
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if (psymbol) |
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return *psymbol; |
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/* NOBREAK */ |
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case M4_SYMBOL_PUSHDEF: |
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/* Insert a name in the symbol table. If there is already a symbol |
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with the name, push the new value on top of the value stack for |
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this symbol. */ |
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{ |
{ |
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m4_symbol *symbol = 0; |
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m4_token_data *value = XCALLOC (m4_token_data, 1); |
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case M4_SYMBOL_INSERT: |
if (psymbol) |
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/* Return the symbol, if the name was found in the table. |
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Otherwise, just insert the name, and return the new symbol. */ |
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if (cmp == 0 && symbol != NULL) |
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return symbol; |
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/* Fall through. */ |
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case M4_SYMBOL_PUSHDEF: |
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/* Insert a name in the symbol table. If there is already a symbol |
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with the name, insert this in front of it, and mark the old |
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symbol as "shadowed". */ |
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symbol = XMALLOC (m4_symbol, 1); |
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M4_SYMBOL_TYPE (symbol) = M4_TOKEN_VOID; |
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M4_SYMBOL_TRACED (symbol) = M4_SYMBOL_SHADOWED (symbol) = FALSE; |
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M4_SYMBOL_NAME (symbol) = xstrdup (name); |
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M4_SYMBOL_NEXT (symbol) = *spp; |
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(*spp) = symbol; |
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if (mode == M4_SYMBOL_PUSHDEF && cmp == 0) |
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{ |
{ |
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M4_SYMBOL_SHADOWED (M4_SYMBOL_NEXT (symbol)) = TRUE; |
symbol = *psymbol; |
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M4_SYMBOL_TRACED (symbol) = M4_SYMBOL_TRACED (M4_SYMBOL_NEXT (symbol)); |
M4_TOKEN_DATA_NEXT (value)= M4_SYMBOL_DATA (symbol); |
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} |
} |
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return symbol; |
else |
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symbol = XCALLOC (m4_symbol, 1); |
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case M4_SYMBOL_DELETE: |
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/* Delete all occurences of symbols with NAME. */ |
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if (cmp != 0 || symbol == NULL) |
M4_SYMBOL_DATA (symbol) = value; |
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return NULL; |
M4_SYMBOL_TYPE (symbol) = M4_TOKEN_VOID; |
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do |
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{ |
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*spp = M4_SYMBOL_NEXT (symbol); |
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free_symbol (symbol); |
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symbol = *spp; |
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} |
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while (symbol != NULL && strcmp (name, M4_SYMBOL_NAME (symbol)) == 0); |
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return NULL; |
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case M4_SYMBOL_POPDEF: |
if (!psymbol) |
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m4_hash_insert (m4_symtab, xstrdup (name), symbol); |
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/* Delete the first occurence of a symbol with NAME. */ |
return symbol; |
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} |
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if (cmp != 0 || symbol == NULL) |
case M4_SYMBOL_POPDEF: |
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return NULL; |
/* Delete the first occurence of a symbol with NAME. */ |
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if (M4_SYMBOL_NEXT (symbol) != NULL && cmp == 0) |
if (psymbol) |
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M4_SYMBOL_SHADOWED (M4_SYMBOL_NEXT (symbol)) = FALSE; |
{ |
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*spp = M4_SYMBOL_NEXT (symbol); |
if (M4_SYMBOL_DATA_NEXT (*psymbol)) |
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free_symbol (symbol); |
m4_symbol_popdef (*psymbol); |
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return NULL; |
else |
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{ |
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xfree (m4_hash_remove (m4_symtab, name)); |
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m4_symbol_delete (*psymbol); |
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} |
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} |
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return 0; |
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default: |
case M4_SYMBOL_DELETE: |
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/* Delete all occurences of symbols with NAME. */ |
199 |
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if (psymbol) |
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{ |
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xfree (m4_hash_remove (m4_symtab, name)); |
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m4_symbol_delete (*psymbol); |
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} |
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else |
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M4ERROR ((warning_status, 0, |
M4ERROR ((warning_status, 0, |
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_("INTERNAL ERROR: Illegal mode to m4_symbol_lookup ()"))); |
_("INTERNAL ERROR: Attempt to delete non-existant symbol"))); |
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abort (); |
return 0; |
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} |
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} |
default: |
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M4ERROR ((warning_status, 0, |
211 |
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_("INTERNAL ERROR: Illegal mode to m4_symbol_lookup ()"))); |
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abort (); |
213 |
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} |
214 |
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} |
215 |
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return NULL; |
/*NOTREACHED*/ |
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return 0; |
218 |
} |
} |
219 |
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/* The following function removes from the symbol table, every symbol |
/* The following function removes from the symbol table, every symbol |
221 |
that references a function in the given builtin table. */ |
that references the given module handle. */ |
222 |
void |
void |
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m4_remove_table_reference_symbols (m4_builtin *builtins, m4_macro *macros) |
m4_remove_table_reference_symbols (lt_dlhandle handle) |
224 |
{ |
{ |
225 |
/* FIXME: This can be reimplemented to work much faster now that each |
m4_hash_iterator *place = 0; |
226 |
symtab entry carries a reference to its defining module. */ |
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227 |
m4_symbol *symbol; |
assert (handle); |
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int h; |
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229 |
/* Look in each bucket of the hashtable... */ |
while ((place = m4_hash_iterator_next (m4_symtab, place))) |
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for (h = 0; h < hash_table_size; h++) |
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230 |
{ |
{ |
231 |
m4_symbol *prev = NULL; |
m4_symbol *symbol = (m4_symbol *) m4_hash_iterator_value (place); |
232 |
m4_symbol *next = NULL; |
m4_token_data *data = M4_SYMBOL_DATA (symbol); |
233 |
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234 |
/* And each symbol in each hash bucket... */ |
/* Purge any shadowed references. */ |
235 |
for (symbol = m4_symtab[h]; symbol != NULL; prev = symbol, symbol = next) |
while (M4_TOKEN_DATA_NEXT (data)) |
236 |
{ |
{ |
237 |
next = M4_SYMBOL_NEXT (symbol); |
m4_token_data *next = M4_TOKEN_DATA_NEXT (data); |
238 |
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239 |
switch (M4_SYMBOL_TYPE (symbol)) |
if (M4_TOKEN_DATA_HANDLE (next) == handle) |
240 |
{ |
{ |
241 |
case M4_TOKEN_FUNC: |
M4_TOKEN_DATA_NEXT (data) = M4_TOKEN_DATA_NEXT (next); |
242 |
/* For symbol functions referencing a function in |
m4_token_data_delete (next); |
243 |
BUILTIN_TABLE. */ |
} |
244 |
{ |
else |
245 |
const m4_builtin *bp; |
data = next; |
246 |
for (bp = builtins; symbol && bp && bp->name != NULL; ++bp) |
} |
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if (M4_SYMBOL_FUNC (symbol) == bp->func) |
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{ |
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if (prev) |
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M4_SYMBOL_NEXT (prev) = M4_SYMBOL_NEXT (symbol); |
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else |
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m4_symtab[h] = M4_SYMBOL_NEXT (symbol); |
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/* Unshadow any symbol that this one had shadowed. */ |
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if (M4_SYMBOL_NEXT (symbol) != NULL) |
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M4_SYMBOL_SHADOWED (M4_SYMBOL_NEXT (symbol)) = FALSE; |
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free_symbol (symbol); |
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/* Maintain the loop invariant. */ |
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symbol = prev; |
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} |
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} |
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break; |
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case M4_TOKEN_TEXT: |
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/* For symbol macros referencing a value in |
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PREDEFINED_TABLE. */ |
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{ |
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const m4_macro *mp; |
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for (mp = macros; symbol && mp && mp->name; mp++) |
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if ((strcmp(M4_SYMBOL_NAME (symbol), mp->name) == 0) |
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&& (strcmp (M4_SYMBOL_TEXT (symbol), mp->value) == 0)) |
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{ |
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if (prev) |
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M4_SYMBOL_NEXT (prev) = M4_SYMBOL_NEXT (symbol); |
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else |
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m4_symtab[h] = M4_SYMBOL_NEXT (symbol); |
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/* Unshadow any symbol that this one had shadowed. */ |
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if (M4_SYMBOL_NEXT (symbol) != NULL) |
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M4_SYMBOL_SHADOWED (M4_SYMBOL_NEXT (symbol)) = FALSE; |
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free_symbol (symbol); |
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/* Maintain the loop invariant. */ |
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symbol = prev; |
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} |
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} |
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break; |
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247 |
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248 |
default: |
/* Purge live reference. */ |
249 |
/*NOWORK*/ |
if (M4_SYMBOL_HANDLE (symbol) == handle) |
250 |
break; |
{ |
251 |
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if (M4_SYMBOL_DATA_NEXT (symbol)) |
252 |
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m4_symbol_popdef (symbol); |
253 |
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else |
254 |
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{ |
255 |
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xfree (m4_hash_remove (m4_symtab, m4_hash_iterator_key (place))); |
256 |
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m4_symbol_delete (symbol); |
257 |
} |
} |
258 |
} |
} |
259 |
} |
} |
264 |
hack_all_symbols () traverses the symbol table, and calls a specified |
hack_all_symbols () traverses the symbol table, and calls a specified |
265 |
function FUNC for each symbol in the table. FUNC is called with a |
function FUNC for each symbol in the table. FUNC is called with a |
266 |
pointer to the symbol, and the DATA argument. */ |
pointer to the symbol, and the DATA argument. */ |
267 |
void |
int |
268 |
m4_hack_all_symbols (m4_hack_symbol *func, const char *data) |
m4_symtab_apply (m4_symtab_apply_func *func, void *data) |
269 |
{ |
{ |
270 |
int h; |
int result = 0; |
271 |
m4_symbol *symbol; |
m4_hash_iterator *place = 0; |
272 |
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273 |
for (h = 0; h < hash_table_size; h++) |
assert (func); |
274 |
for (symbol = m4_symtab[h]; symbol != NULL; symbol = M4_SYMBOL_NEXT (symbol)) |
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275 |
(*func) (symbol, data); |
while ((place = m4_hash_iterator_next (m4_symtab, place))) |
276 |
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{ |
277 |
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const char *name = (const char *) m4_hash_iterator_key (place); |
278 |
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m4_symbol *symbol = (m4_symbol *) m4_hash_iterator_value (place); |
279 |
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result = (*func) (name, symbol, data); |
280 |
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281 |
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if (result != 0) |
282 |
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break; |
283 |
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} |
284 |
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285 |
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return result; |
286 |
} |
} |
287 |
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288 |
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289 |
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290 |
#ifdef DEBUG_SYM |
#ifdef DEBUG_SYM |
291 |
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292 |
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static int symtab_print_list (const char *name, m4_symbol *symbol, void *ignored); |
293 |
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294 |
static void |
static void |
295 |
symtab_debug (void) |
symtab_debug (void) |
296 |
{ |
{ |
300 |
m4_symbol *s; |
m4_symbol *s; |
301 |
int delete; |
int delete; |
302 |
|
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303 |
while ((t = next_token (&td)) != NULL) |
while ((t = m4_next_token (&td)) != NULL) |
304 |
{ |
{ |
305 |
if (t != M4_TOKEN_WORD) |
if (t != M4_TOKEN_WORD) |
306 |
continue; |
continue; |
323 |
else |
else |
324 |
(void) m4_lookup_symbol (text, M4_SYMBOL_INSERT); |
(void) m4_lookup_symbol (text, M4_SYMBOL_INSERT); |
325 |
} |
} |
326 |
m4_hack_all_symbols (symtab_print_list, "foo"); |
m4_symtab_apply (symtab_print_list, 0); |
327 |
} |
} |
328 |
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329 |
static void |
static int |
330 |
symtab_print_list (int i) |
symtab_print_list (const char *name, m4_symbol *symbol, void *ignored) |
331 |
{ |
{ |
332 |
m4_symbol *symbol; |
printf ("\tname %s, addr %#x, flags: %s\n", |
333 |
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name, (unsigned) symbol, |
334 |
printf ("Symbol dump #%d:\n", i); |
M4_SYMBOL_TRACED (symbol) ? " traced" : "<none>"); |
335 |
for (symbol = m4_symtab[i]; symbol != NULL; symbol = symbol->next) |
return 0; |
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printf ("\tname %s, addr 0x%x, next 0x%x, flags%s%s\n", |
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M4_SYMBOL_NAME (symbol), symbol, symbol->next, |
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M4_SYMBOL_TRACED (symbol) ? " traced" : "", |
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M4_SYMBOL_SHADOWED (symbol) ? " shadowed" : ""); |
|
336 |
} |
} |
337 |
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338 |
#endif /* DEBUG_SYM */ |
#endif /* DEBUG_SYM */ |