7c549890f1
git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk/SWIG@208 626c5289-ae23-0410-ae9c-e8d60b6d4f22
146 lines
3.9 KiB
C++
146 lines
3.9 KiB
C++
/* -----------------------------------------------------------------------------
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* symbol.cxx
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*
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* Symbol table management.
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*
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* Author(s) : David Beazley (beazley@cs.uchicago.edu)
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*
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* Copyright (C) 1998-2000. The University of Chicago
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* Copyright (C) 1995-1998. The University of Utah and The Regents of the
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* University of California.
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*
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* See the file LICENSE for information on usage and redistribution.
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* ----------------------------------------------------------------------------- */
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#include "internal.h"
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static char cvstag[] = "$Header$";
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// -----------------------------------------------------------------------------
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// Symbol object
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// -----------------------------------------------------------------------------
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struct Symbol {
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~Symbol() {
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if (name) delete name;
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if (type) delete type;
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if (value) delete value;
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}
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char *name;
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DataType *type; // Optional datatype
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char *value; // Optional value (for constant expressions)
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};
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static Hash SymHash; // SWIG Symbol table
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// -----------------------------------------------------------------------------
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// int add_symbol(char *name, DataType *type, char *value)
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//
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// Adds a symbol to the symbol table. Returns -1 if symbol is already in the table.
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// -----------------------------------------------------------------------------
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int add_symbol(char *name, DataType *type, char *value) {
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Symbol *s;
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int ret;
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s = new Symbol;
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s->name = copy_string(name);
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if (type)
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s->type = new DataType(type);
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else s->type = (DataType *) 0;
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if (value)
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s->value = copy_string(value);
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else s->value = (char *) 0;
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// Add this to the symbol table
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ret = SymHash.add(s->name, s);
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if (ret == -1) {
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delete s;
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}
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return ret;
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}
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// -----------------------------------------------------------------------------
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// int lookup_symbol(char *name)
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//
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// Checks to see if a symbol is in the symbol table.
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// -----------------------------------------------------------------------------
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int lookup_symbol(char *name) {
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Symbol *s;
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s = (Symbol *) SymHash.lookup(name);
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if (s) return 1;
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else return 0;
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}
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// -----------------------------------------------------------------------------
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// DataType *lookup_symtype(char *name)
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//
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// Returns the datatype of a symbol or NULL if not found.
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// -----------------------------------------------------------------------------
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DataType *lookup_symtype(char *name) {
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Symbol *s;
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s = (Symbol *) SymHash.lookup(name);
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if (s) return s->type;
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else return (DataType *) 0;
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}
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// -----------------------------------------------------------------------------
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// char *lookup_symvalue(char *name)
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//
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// Returns the value associate with a symbol.
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// -----------------------------------------------------------------------------
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char *lookup_symvalue(char *name) {
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Symbol *s;
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s = (Symbol *) SymHash.lookup(name);
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if (s) return s->value;
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else return (char *) 0;
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}
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// -----------------------------------------------------------------------------
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// int update_symbol(char *name, DataType *type, char *value)
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//
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// Updates a symbol (or create it) in the hash table.
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// -----------------------------------------------------------------------------
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int update_symbol(char *name, DataType *type, char *value) {
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Symbol *s;
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s = (Symbol *) SymHash.lookup(name);
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if (s) {
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if (s->type) delete s->type;
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if (s->value) delete s->value;
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if (type)
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s->type = new DataType(type);
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else
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s->type = (DataType *) 0;
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if (value)
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s->value = copy_string(value);
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else
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s->value = (char *) 0;
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return 0;
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} else {
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return add_symbol(name, type, value);
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}
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}
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// -----------------------------------------------------------------------------
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// void remove_symbol(char *name)
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//
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// Removes a symbol from the symbol table.
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// -----------------------------------------------------------------------------
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void remove_symbol(char *name) {
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SymHash.remove(name);
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}
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