| %verify "executed" |
| %verify "null object" |
| %verify "class cast exception thrown, with correct class name" |
| %verify "class cast exception not thrown on same class" |
| %verify "class cast exception not thrown on subclass" |
| %verify "class not resolved" |
| %verify "class already resolved" |
| /* |
| * Check to see if a cast from one class to another is allowed. |
| */ |
| /* check-cast vAA, class@BBBB */ |
| GET_GLUE(%ecx) |
| movzbl rINST_HI,rINST_FULL # rINST_FULL<- AA |
| GET_VREG(rINST_FULL,rINST_FULL) # rINST_FULL<- vAA (object) |
| movzwl 2(rPC),%eax # eax<- BBBB |
| movl offGlue_methodClassDex(%ecx),%ecx # ecx<- pDvmDex |
| testl rINST_FULL,rINST_FULL # is oject null? |
| movl offDvmDex_pResClasses(%ecx),%ecx # ecx<- pDvmDex->pResClasses |
| je .L${opcode}_okay # null obj, cast always succeeds |
| movl (%ecx,%eax,4),%eax # eax<- resolved class |
| movl offObject_clazz(rINST_FULL),%ecx # ecx<- obj->clazz |
| testl %eax,%eax # have we resolved this before? |
| je .L${opcode}_resolve # no, go do it now |
| .L${opcode}_resolved: |
| cmpl %eax,%ecx # same class (trivial success)? |
| jne .L${opcode}_fullcheck # no, do full check |
| .L${opcode}_okay: |
| FETCH_INST_WORD(2) |
| ADVANCE_PC(2) |
| GOTO_NEXT |
| %break |
| |
| /* |
| * Trivial test failed, need to perform full check. This is common. |
| * ecx holds obj->clazz |
| * eax holds class resolved from BBBB |
| * rINST_FULL holds object |
| */ |
| .L${opcode}_fullcheck: |
| movl %eax,OUT_ARG1(%esp) |
| movl %ecx,OUT_ARG0(%esp) |
| SPILL(rPC) |
| call dvmInstanceofNonTrivial # eax<- boolean result |
| UNSPILL(rPC) |
| testl %eax,%eax # failed? |
| jne .L${opcode}_okay # no, success |
| |
| # A cast has failed. We need to throw a ClassCastException with the |
| # class of the object that failed to be cast. |
| EXPORT_PC() |
| movl offObject_clazz(rINST_FULL),%ecx # ecx<- obj->clazz |
| movl $$.LstrClassCastException,%eax |
| movl offClassObject_descriptor(%ecx),%ecx |
| movl %eax,OUT_ARG0(%esp) # arg0<- message |
| movl %ecx,OUT_ARG1(%esp) # arg1<- obj->clazz->descriptor |
| SPILL(rPC) |
| call dvmThrowExceptionWithClassMessage |
| UNSPILL(rPC) |
| jmp common_exceptionThrown |
| |
| /* |
| * Resolution required. This is the least-likely path, and we're |
| * going to have to recreate some data. |
| * |
| * rINST_FULL holds object |
| */ |
| .L${opcode}_resolve: |
| GET_GLUE(%ecx) |
| EXPORT_PC() |
| movzwl 2(rPC),%eax # eax<- BBBB |
| movl offGlue_method(%ecx),%ecx # ecx<- glue->method |
| movl %eax,OUT_ARG1(%esp) # arg1<- BBBB |
| movl offMethod_clazz(%ecx),%ecx # ecx<- metho->clazz |
| movl $$0,OUT_ARG2(%esp) # arg2<- false |
| movl %ecx,OUT_ARG0(%esp) # arg0<- method->clazz |
| SPILL(rPC) |
| call dvmResolveClass # eax<- resolved ClassObject ptr |
| UNSPILL(rPC) |
| testl %eax,%eax # got null? |
| je common_exceptionThrown # yes, handle exception |
| movl offObject_clazz(rINST_FULL),%ecx # ecx<- obj->clazz |
| jmp .L${opcode}_resolved # pick up where we left off |
