scope.h

一个编译器修改的例子

#ifndef SCOPE_H
#define SCOPE_H

typedef struct scope Scope;

#include "declaration.h"

Scope		*new_scope(void);
			/* Start a new scope. The parent of that scope will
			 * be current_scope
			 */
void		leave_scope(void);
			/* Set current scope to current_scope->parent */
void		delete_scope(Scope *);

void		declare(const char *key, Declaration *decl);
			/* Link the string 'key' to the declaration 'decl',
			 * in current_scope! When 'key' already exists in
			 * current_scope, error() is called with an
			 * appropriate message.
			 */
Declaration	*lookup(const Scope *, const char *key);
			/* Lookup 'key' in the specified scope and in its
			 * parent scopes. When found, return the Declaration
			 * it is linked to. The first match (inner most scope)
			 * is returned.
			 */
Declaration	*lookup_in_this_scope(const Scope *, const char *key);
			/* As lookup(), but just search this one scope. */

extern Scope	*current_scope, *global_scope;
			/* global_scope is the outer most scope, containing
			 * the global Asterix declarations. current_scope is
			 * used during parsing and points to the current scope
			 * at the point in the Asterix source that the parser
			 * is currently processing.
			 */
#endif