| buzbee | 1452bee | 2015-03-06 14:43:04 -0800 | [diff] [blame^] | 1 | %default { "load":"ldr", "shift":"2", "is_object":"0", "data_offset":"MIRROR_INT_ARRAY_DATA_OFFSET" } |
| 2 | /* |
| 3 | * Array get, 32 bits or less. vAA <- vBB[vCC]. |
| 4 | * |
| 5 | * Note: using the usual FETCH/and/shift stuff, this fits in exactly 17 |
| 6 | * instructions. We use a pair of FETCH_Bs instead. |
| 7 | * |
| 8 | * for: aget, aget-object, aget-boolean, aget-byte, aget-char, aget-short |
| 9 | * |
| 10 | * NOTE: assumes data offset for arrays is the same for all non-wide types. |
| 11 | * If this changes, specialize. |
| 12 | */ |
| 13 | /* op vAA, vBB, vCC */ |
| 14 | FETCH_B r2, 1, 0 @ r2<- BB |
| 15 | mov r9, rINST, lsr #8 @ r9<- AA |
| 16 | FETCH_B r3, 1, 1 @ r3<- CC |
| 17 | GET_VREG r0, r2 @ r0<- vBB (array object) |
| 18 | GET_VREG r1, r3 @ r1<- vCC (requested index) |
| 19 | cmp r0, #0 @ null array object? |
| 20 | beq common_errNullObject @ yes, bail |
| 21 | ldr r3, [r0, #MIRROR_ARRAY_LENGTH_OFFSET] @ r3<- arrayObj->length |
| 22 | add r0, r0, r1, lsl #$shift @ r0<- arrayObj + index*width |
| 23 | cmp r1, r3 @ compare unsigned index, length |
| 24 | bcs common_errArrayIndex @ index >= length, bail |
| 25 | FETCH_ADVANCE_INST 2 @ advance rPC, load rINST |
| 26 | $load r2, [r0, #$data_offset] @ r2<- vBB[vCC] |
| 27 | GET_INST_OPCODE ip @ extract opcode from rINST |
| 28 | .if $is_object |
| 29 | SET_VREG_OBJECT r2, r9 @ vAA<- r2 |
| 30 | .else |
| 31 | SET_VREG r2, r9 @ vAA<- r2 |
| 32 | .endif |
| 33 | GOTO_OPCODE ip @ jump to next instruction |