1   /* Copyright (C) 2008 The Android Open Source Project
2    *
3    * Licensed under the Apache License, Version 2.0 (the "License");
4    * you may not use this file except in compliance with the License.
5    * You may obtain a copy of the License at
6    *
7    * http://www.apache.org/licenses/LICENSE-2.0
8    *
9    * Unless required by applicable law or agreed to in writing, software
10    * distributed under the License is distributed on an "AS IS" BASIS,
11    * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12    * See the License for the specific language governing permissions and
13    * limitations under the License.
14    */
15
16   /*
17    * File: OP_ARRAY_LENGTH.S
18    *
19    * Code: 32-bit array length operation.
20    *
21    * For: array-length
22    *
23    * Description: Store the length of the indicated array in the given
24    *              destination register. vB <- offArrayObject_length(vA)
25    *
26    * Format: B|A|op (12x)
27    *
28    * Syntax: op vA, vB
29    */
30
31    movl        rINST, %eax             # %eax<- BA
32    shr         $$4, %eax               # %eax<- B
33    andl        $$15, rINST             # rINST<- A
34    GET_VREG    %eax                    # %eax<- vB
35    cmp         $$0, %eax               # check for null array object
36    je          common_errNullObject    # handle null array object
37    FFETCH_ADV  1, %edx                 # %edx<- next instruction hi; fetch, advance
38    movl        offArrayObject_length(%eax), %eax # %eax<- array length
39    movl        %eax, (rFP, rINST, 4)   # vA<- %eax; array length
40    FGETOP_JMP  1, %edx                 # jump to next instruction; getop, jmp
41