Mercurial > hg > index.cgi
comparison lwasm/insn_gen.c @ 283:210d261a614d
Make byte overflow detection for indexing work better
There are *two* places where indexed addressing is calculated - lea style
instructions and general addressing instructions. Actually check for byte
overflows in both places. Also, extend byte overflow checking to all 8 bit
offsets from index registers, not just PCR.
| author | William Astle <lost@l-w.ca> |
|---|---|
| date | Mon, 02 Sep 2013 10:49:57 -0600 |
| parents | 67acad9db5b3 |
| children | 3afb809c7add |
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| 282:3c421f24c9b8 | 283:210d261a614d |
|---|---|
| 268 | 268 |
| 269 if (l -> lint2 == 1) | 269 if (l -> lint2 == 1) |
| 270 { | 270 { |
| 271 lwasm_emit(l, l -> pb); | 271 lwasm_emit(l, l -> pb); |
| 272 if (l -> lint > 0) | 272 if (l -> lint > 0) |
| 273 { | |
| 274 int i; | |
| 275 i = lw_expr_intval(e); | |
| 276 if (l -> lint == 1) | |
| 277 { | |
| 278 if (i < -128 || i > 127) | |
| 279 lwasm_register_error(as, l, "Byte overflow"); | |
| 280 } | |
| 273 lwasm_emitexpr(l, e, l -> lint); | 281 lwasm_emitexpr(l, e, l -> lint); |
| 282 } | |
| 274 return; | 283 return; |
| 275 } | 284 } |
| 276 | 285 |
| 277 if (l -> lint2 == 2) | 286 if (l -> lint2 == 2) |
| 278 lwasm_emitexpr(l, e, 2); | 287 lwasm_emitexpr(l, e, 2); |