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changeset 355:3afb809c7add
Make 8 bit immediate operands flag a byte overflow if not in 8 bit range.
8 bit immediate operands should flag a byte overflow if they are out of
range. The acceptable range is -128 <= x <= 255 to cover both signed and
unsigned values.
| author | William Astle <lost@l-w.ca> |
|---|---|
| date | Tue, 19 May 2015 12:26:35 -0600 |
| parents | 433851a26794 |
| children | c6bd6e9bc6df |
| files | lwasm/insn_gen.c |
| diffstat | 1 files changed, 19 insertions(+), 0 deletions(-) [+] |
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--- a/lwasm/insn_gen.c Fri May 15 15:47:26 2015 -0600 +++ b/lwasm/insn_gen.c Tue May 19 12:26:35 2015 -0600 @@ -369,6 +369,16 @@ { lw_expr_t e; e = lwasm_fetch_expr(l, 0); + if (lw_expr_istype(e, lw_expr_type_int)) + { + int i; + i = lw_expr_intval(e); + if (i < -128 || i > 255) + { + lwasm_register_error(as, l, "Byte overflow"); + } + } + lwasm_emitop(l, instab[l -> insn].ops[3]); lwasm_emitexpr(l, e, 1); return; @@ -528,5 +538,14 @@ lwasm_emitop(l, instab[l -> insn].ops[0]); e = lwasm_fetch_expr(l, 0); + if (lw_expr_istype(e, lw_expr_type_int)) + { + int i; + i = lw_expr_intval(e); + if (i < -128 || i > 255) + { + lwasm_register_error(as, l, "Byte overflow"); + } + } lwasm_emitexpr(l, e, 1); }