Hi every body,
As we know that when DalvikVM run a dex file,it read byte code from
dex file and convert to machine code to execute on current platform. I
do not understand the process about how to Dalvik converts byte code
to machine code.
For example, op code invoke static in file \dalvik\vm\mterp\out
\InterpAsm-armv5te.S
.L_OP_INVOKE_STATIC: /* 0x71 */
/* File: armv5te/OP_INVOKE_STATIC.S */
/*
* Handle a static method call.
*
* for: invoke-static, invoke-static/range
*/
/* op vB, {vD, vE, vF, vG, vA}, cl...@cccc */
/* op {vCCCC..v(CCCC+AA-1)}, m...@bbbb */
ldr r3, [rGLUE, #offGlue_methodClassDex] @ r3<- pDvmDex
FETCH(r1, 1) @ r1<- BBBB
ldr r3, [r3, #offDvmDex_pResMethods] @ r3<- pDvmDex-
>pResMethods
ldr r0, [r3, r1, lsl #2] @ r0<- resolved methodToCall
cmp r0, #0 @ already resolved?
EXPORT_PC() @ must export for invoke
bne common_invokeMethodNoRange @ yes, continue on
0: ldr r3, [rGLUE, #offGlue_method] @ r3<- glue->method
ldr r0, [r3, #offMethod_clazz] @ r0<- method->clazz
mov r2, #METHOD_STATIC @ resolver method type
bl dvmResolveMethod @ r0<- call(clazz, ref, flags)
cmp r0, #0 @ got null?
bne common_invokeMethodNoRange @ no, continue
b common_exceptionThrown @ yes, handle exception
I do not understand the above algorithm and the meaning of every lines
code that implement op code invoke static for ARM assembler
What is
/* op vB, {vD, vE, vF, vG, vA}, cl...@cccc */
/* op {vCCCC..v(CCCC+AA-1)}, m...@bbbb */
and what is the meaning of every line of above code, for example
ldr r3, [rGLUE, #offGlue_methodClassDex] @ r3<- pDvmDex
Could you help me how to understand the above code and the algorithm
to implement op code invoke static? Do we have any document about it?
Thanks a lot
Mercury
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