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Add support for unions

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Unions allow multiple memory allocations (using ds, etc.) to share the
same space in memory.

This allows games to use the same memory for different purposes,
depending on their state.

This also adds documentation on how to use the new UNION, NEXTU, and
ENDU keywords.
This commit is contained in:
Ben10do
2017-07-20 19:17:03 +01:00
committed by Antonio Niño Díaz
parent 4d01b2d5ac
commit f8bbe9be48
6 changed files with 132 additions and 7 deletions
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10
include/asm/asm.h
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@@ -18,19 +18,23 @@
#include "asm/localasm.h"
#define MAXUNIONS 128
#define MAXMACROARGS 256
#define MAXINCPATHS 128
extern SLONG nLineNo;
extern ULONG nTotalLines;
extern ULONG nPC;
extern ULONG nPass;
extern ULONG nIFDepth;
extern bool skipElif;
extern ULONG nUnionDepth;
extern ULONG unionStart[MAXUNIONS];
extern ULONG unionSize[MAXUNIONS];
extern char tzCurrentFileName[_MAX_PATH + 1];
extern struct Section *pCurrentSection;
extern struct sSymbol *tHashedSymbols[HASHSIZE];
extern struct sSymbol *pPCSymbol;
extern bool oDontExpandStrings;
#define MAXMACROARGS 256
#define MAXINCPATHS 128
#endif /* // ASM_H */