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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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9
src/asm/main.c
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@@ -22,8 +22,9 @@ char **cldefines;
clock_t nStartClock, nEndClock;
SLONG nLineNo;
ULONG nTotalLines, nPass, nPC, nIFDepth, nErrors;
ULONG nTotalLines, nPass, nPC, nIFDepth, nUnionDepth, nErrors;
bool skipElif;
ULONG unionStart[128], unionSize[128];
extern int yydebug;
@@ -416,6 +417,7 @@ main(int argc, char *argv[])
nTotalLines = 0;
nIFDepth = 0;
skipElif = true;
nUnionDepth = 0;
nPC = 0;
nPass = 1;
nErrors = 0;
@@ -438,11 +440,16 @@ main(int argc, char *argv[])
if (nIFDepth != 0) {
errx(1, "Unterminated IF construct (%ld levels)!", nIFDepth);
}
if (nUnionDepth != 0) {
errx(1, "Unterminated UNION construct (%ld levels)!", nUnionDepth);
}
nTotalLines = 0;
nLineNo = 1;
nIFDepth = 0;
skipElif = true;
nUnionDepth = 0;
nPC = 0;
nPass = 2;
nErrors = 0;