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[qfcc] Emit statements for expressions only once

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The switch to using expression dags instead of trees meant that the
statement generator could traverse sub-expressions multiple times. This
is inefficient but usually ok if there are no side effects. However,
side effects and branches (usually from ?:, due to labels) break: side
effects happen more than once, and labels get emitted multiple times
resulting in orphaned statement blocks (and, in the end, uninitialized
temporaries).
This commit is contained in:
Bill Currie 2024-02-08 13:41:32 +09:00
parent 701b0f3992
commit cf756eb1a0
2 changed files with 8 additions and 1 deletions
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8
tools/qfcc/source/statements.c
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@ -2046,7 +2046,13 @@ statement_subexpr (sblock_t *sblock, const expr_t *e, operand_t **op)
internal_error (e, "unexpected sub-expression type: %s",
expr_names[e->type]);
sblock = sfuncs[e->type] (sblock, e, op);
if (e->op) {
*op = e->op;
} else {
sblock = sfuncs[e->type] (sblock, e, op);
//FIXME const cast (store elsewhere)
((expr_t *) e)->op = *op;
}
return sblock;
}