| /* | |
| * For polymorphic callsite, check whether the cached class pointer matches | |
| * the current one. If so setup the Dalvik frame and return to the | |
| * Thumb code through the link register to transfer control to the callee | |
| * method through a dedicated chaining cell. | |
| * | |
| * The predicted chaining cell is declared in ArmLIR.h with the | |
| * following layout: | |
| * | |
| * typedef struct PredictedChainingCell { | |
| * u4 branch; | |
| * const ClassObject *clazz; | |
| * const Method *method; | |
| * u4 counter; | |
| * } PredictedChainingCell; | |
| * | |
| * Upon returning to the callsite: | |
| * - lr : to branch to the chaining cell | |
| * - lr+2: to punt to the interpreter | |
| * - lr+4: to fully resolve the callee and may rechain. | |
| * r3 <- class | |
| * r9 <- counter | |
| */ | |
| @ r0 = this, r1 = returnCell, r2 = predictedChainCell, rPC = dalvikCallsite | |
| ldr r3, [r0, #offObject_clazz] @ r3 <- this->class | |
| ldr r8, [r2, #4] @ r8 <- predictedChainCell->clazz | |
| ldr r0, [r2, #8] @ r0 <- predictedChainCell->method | |
| ldr r9, [r2, #12] @ r9 <- predictedChainCell->counter | |
| cmp r3, r8 @ predicted class == actual class? | |
| beq .LinvokeChain @ predicted chain is valid | |
| ldr r7, [r3, #offClassObject_vtable] @ r7 <- this->class->vtable | |
| sub r1, r9, #1 @ count-- | |
| str r1, [r2, #12] @ write back to PredictedChainingCell->counter | |
| add lr, lr, #4 @ return to fully-resolve landing pad | |
| /* | |
| * r1 <- count | |
| * r2 <- &predictedChainCell | |
| * r3 <- this->class | |
| * r4 <- dPC | |
| * r7 <- this->class->vtable | |
| */ | |
| bx lr |