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/*
casm - Simple, portable assembler
Copyright (C) 2003-2015 Ian Cowburn (ianc@noddybox.co.uk)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
-------------------------------------------------------------------------
Collection for labels.
*/
#ifndef CASM_LABEL_H
#define CASM_LABEL_H
#include <stdio.h>
/* ---------------------------------------- INTERFACES
*/
/* Maximum size of a label. All characters past this point will be ignored.
*/
#define MAX_LABEL_SIZE 32
/* Label types
*/
typedef enum
{
GLOBAL_LABEL = 1,
LOCAL_LABEL = 2,
ANY_LABEL = 3
} LabelType;
/* A label
*/
typedef struct
{
char name[MAX_LABEL_SIZE+1];
int value;
LabelType type;
} Label;
/* Clear labels
*/
void LabelClear(void);
/* Expand a label or constant value. Returns TRUE if parsed OK.
*/
int LabelExpand(const char *expr, int *result);
/* Utility to sanatise a label name, returning whether it's a global or local
label. Returns FALSE if the label is invalid, otherwise returns TRUE.
*/
int LabelSanatise(char *label, LabelType *type);
/* Get a label. Returns NULL for an undefined label.
*/
const Label *LabelFind(const char *label, LabelType type);
/* Set a label. If the label already exists, overwrites the value.
If the label being set is a GLOBAL_LABEL also sets the scope for local
variables and the stacked global scope is cleared.
*/
void LabelSet(const char *label, int value, LabelType type);
/* Set a global label, pushing the current global namespace onto a stack.
*/
void LabelScopePush(const char *label, int value);
/* Pops the last namespace that was saved with LabelScopePush().
*/
void LabelScopePop(void);
/* Sets the current global scope for local variables to the named global
label.
*/
void LabelSetScope(const char *label);
/* Create a label name to be used as a namespace. The return is static and
must be saved to be used. Namespaces are simple identifer created in a set
order, so LabelResetNamespace() can be used to replay them.
*/
const char *LabelCreateNamespace(void);
/* Reset namespace generation back to its initial point.
*/
void LabelResetNamespace(void);
/* Dump a formatted report of labels to the passed file pointer
*/
void LabelDump(FILE *fp, int dump_private);
/* Dump a binary blob of information containing all the labels
*/
void LabelWriteBlob(FILE *fp);
/* Read a binary blob of information containing all the labels, adjusting values
by the passed offset.
*/
void LabelReadBlob(FILE *fp, int offset);
#endif
/*
vim: ai sw=4 ts=8 expandtab
*/
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