/*
* ===========================================================================
* Common subroutines and data
* ===========================================================================
*/
/*
* We've detected a condition that will result in an exception, but the exception
* has not yet been thrown. Just bail out to the reference interpreter to deal with it.
* TUNING: for consistency, we may want to just go ahead and handle these here.
*/
common_errDivideByZero:
EXPORT_PC
#if MTERP_LOGGING
mov x0, xSELF
add x1, xFP, #OFF_FP_SHADOWFRAME
bl MterpLogDivideByZeroException
#endif
b MterpCommonFallback
common_errArrayIndex:
EXPORT_PC
#if MTERP_LOGGING
mov x0, xSELF
add x1, xFP, #OFF_FP_SHADOWFRAME
bl MterpLogArrayIndexException
#endif
b MterpCommonFallback
common_errNegativeArraySize:
EXPORT_PC
#if MTERP_LOGGING
mov x0, xSELF
add x1, xFP, #OFF_FP_SHADOWFRAME
bl MterpLogNegativeArraySizeException
#endif
b MterpCommonFallback
common_errNoSuchMethod:
EXPORT_PC
#if MTERP_LOGGING
mov x0, xSELF
add x1, xFP, #OFF_FP_SHADOWFRAME
bl MterpLogNoSuchMethodException
#endif
b MterpCommonFallback
common_errNullObject:
EXPORT_PC
#if MTERP_LOGGING
mov x0, xSELF
add x1, xFP, #OFF_FP_SHADOWFRAME
bl MterpLogNullObjectException
#endif
b MterpCommonFallback
common_exceptionThrown:
EXPORT_PC
#if MTERP_LOGGING
mov x0, xSELF
add x1, xFP, #OFF_FP_SHADOWFRAME
bl MterpLogExceptionThrownException
#endif
b MterpCommonFallback
MterpSuspendFallback:
EXPORT_PC
#if MTERP_LOGGING
mov x0, xSELF
add x1, xFP, #OFF_FP_SHADOWFRAME
ldr x2, [xSELF, #THREAD_FLAGS_OFFSET]
bl MterpLogSuspendFallback
#endif
b MterpCommonFallback
/*
* If we're here, something is out of the ordinary. If there is a pending
* exception, handle it. Otherwise, roll back and retry with the reference
* interpreter.
*/
MterpPossibleException:
ldr x0, [xSELF, #THREAD_EXCEPTION_OFFSET]
cbz x0, MterpFallback // If not, fall back to reference interpreter.
/* intentional fallthrough - handle pending exception. */
/*
* On return from a runtime helper routine, we've found a pending exception.
* Can we handle it here - or need to bail out to caller?
*
*/
MterpException:
mov x0, xSELF
add x1, xFP, #OFF_FP_SHADOWFRAME
bl MterpHandleException // (self, shadow_frame)
cbz w0, MterpExceptionReturn // no local catch, back to caller.
ldr x0, [xFP, #OFF_FP_CODE_ITEM]
ldr w1, [xFP, #OFF_FP_DEX_PC]
ldr xIBASE, [xSELF, #THREAD_CURRENT_IBASE_OFFSET]
add xPC, x0, #CODEITEM_INSNS_OFFSET
add xPC, xPC, x1, lsl #1 // generate new dex_pc_ptr
/* Do we need to switch interpreters? */
bl MterpShouldSwitchInterpreters
cbnz w0, MterpFallback
/* resume execution at catch block */
EXPORT_PC
FETCH_INST
GET_INST_OPCODE ip
GOTO_OPCODE ip
/* NOTE: no fallthrough */
/*
* Common handling for branches with support for Jit profiling.
* On entry:
* wINST <= signed offset
* wPROFILE <= signed hotness countdown (expanded to 32 bits)
* condition bits <= set to establish sign of offset (use "NoFlags" entry if not)
*
* We have quite a few different cases for branch profiling, OSR detection and
* suspend check support here.
*
* Taken backward branches:
* If profiling active, do hotness countdown and report if we hit zero.
* If in osr check mode, see if our target is a compiled loop header entry and do OSR if so.
* Is there a pending suspend request? If so, suspend.
*
* Taken forward branches and not-taken backward branches:
* If in osr check mode, see if our target is a compiled loop header entry and do OSR if so.
*
* Our most common case is expected to be a taken backward branch with active jit profiling,
* but no full OSR check and no pending suspend request.
* Next most common case is not-taken branch with no full OSR check.
*
*/
MterpCommonTakenBranchNoFlags:
cmp wINST, #0
b.gt .L_forward_branch // don't add forward branches to hotness
tbnz wPROFILE, #31, .L_no_count_backwards // go if negative
subs wPROFILE, wPROFILE, #1 // countdown
b.eq .L_add_batch // counted down to zero - report
.L_resume_backward_branch:
ldr lr, [xSELF, #THREAD_FLAGS_OFFSET]
add w2, wINST, wINST // w2<- byte offset
FETCH_ADVANCE_INST_RB w2 // update rPC, load wINST
REFRESH_IBASE
ands lr, lr, #(THREAD_SUSPEND_REQUEST | THREAD_CHECKPOINT_REQUEST)
b.ne .L_suspend_request_pending
GET_INST_OPCODE ip // extract opcode from wINST
GOTO_OPCODE ip // jump to next instruction
.L_suspend_request_pending:
EXPORT_PC
mov x0, xSELF
bl MterpSuspendCheck // (self)
cbnz x0, MterpFallback
REFRESH_IBASE // might have changed during suspend
GET_INST_OPCODE ip // extract opcode from wINST
GOTO_OPCODE ip // jump to next instruction
.L_no_count_backwards:
cmp wPROFILE, #JIT_CHECK_OSR // possible OSR re-entry?
b.ne .L_resume_backward_branch
mov x0, xSELF
add x1, xFP, #OFF_FP_SHADOWFRAME
mov x2, xINST
EXPORT_PC
bl MterpMaybeDoOnStackReplacement // (self, shadow_frame, offset)
cbnz x0, MterpOnStackReplacement
b .L_resume_backward_branch
.L_forward_branch:
cmp wPROFILE, #JIT_CHECK_OSR // possible OSR re-entry?
b.eq .L_check_osr_forward
.L_resume_forward_branch:
add w2, wINST, wINST // w2<- byte offset
FETCH_ADVANCE_INST_RB w2 // update rPC, load wINST
GET_INST_OPCODE ip // extract opcode from wINST
GOTO_OPCODE ip // jump to next instruction
.L_check_osr_forward:
mov x0, xSELF
add x1, xFP, #OFF_FP_SHADOWFRAME
mov x2, xINST
EXPORT_PC
bl MterpMaybeDoOnStackReplacement // (self, shadow_frame, offset)
cbnz x0, MterpOnStackReplacement
b .L_resume_forward_branch
.L_add_batch:
add x1, xFP, #OFF_FP_SHADOWFRAME
strh wPROFILE, [x1, #SHADOWFRAME_HOTNESS_COUNTDOWN_OFFSET]
ldr x0, [xFP, #OFF_FP_METHOD]
mov x2, xSELF
bl MterpAddHotnessBatch // (method, shadow_frame, self)
mov wPROFILE, w0 // restore new hotness countdown to wPROFILE
b .L_no_count_backwards
/*
* Entered from the conditional branch handlers when OSR check request active on
* not-taken path. All Dalvik not-taken conditional branch offsets are 2.
*/
.L_check_not_taken_osr:
mov x0, xSELF
add x1, xFP, #OFF_FP_SHADOWFRAME
mov x2, #2
EXPORT_PC
bl MterpMaybeDoOnStackReplacement // (self, shadow_frame, offset)
cbnz x0, MterpOnStackReplacement
FETCH_ADVANCE_INST 2
GET_INST_OPCODE ip // extract opcode from wINST
GOTO_OPCODE ip // jump to next instruction
/*
* Check for suspend check request. Assumes wINST already loaded, xPC advanced and
* still needs to get the opcode and branch to it, and flags are in lr.
*/
MterpCheckSuspendAndContinue:
ldr xIBASE, [xSELF, #THREAD_CURRENT_IBASE_OFFSET] // refresh xIBASE
ands w7, w7, #(THREAD_SUSPEND_REQUEST | THREAD_CHECKPOINT_REQUEST)
b.ne check1
GET_INST_OPCODE ip // extract opcode from wINST
GOTO_OPCODE ip // jump to next instruction
check1:
EXPORT_PC
mov x0, xSELF
bl MterpSuspendCheck // (self)
cbnz x0, MterpFallback // Something in the environment changed, switch interpreters
GET_INST_OPCODE ip // extract opcode from wINST
GOTO_OPCODE ip // jump to next instruction
/*
* On-stack replacement has happened, and now we've returned from the compiled method.
*/
MterpOnStackReplacement:
#if MTERP_LOGGING
mov x0, xSELF
add x1, xFP, #OFF_FP_SHADOWFRAME
sbfm x2, xINST, 0, 31
bl MterpLogOSR
#endif
mov x0, #1 // Signal normal return
b MterpDone
/*
* Bail out to reference interpreter.
*/
MterpFallback:
EXPORT_PC
#if MTERP_LOGGING
mov x0, xSELF
add x1, xFP, #OFF_FP_SHADOWFRAME
bl MterpLogFallback
#endif
MterpCommonFallback:
mov x0, #0 // signal retry with reference interpreter.
b MterpDone
/*
* We pushed some registers on the stack in ExecuteMterpImpl, then saved
* SP and LR. Here we restore SP, restore the registers, and then restore
* LR to PC.
*
* On entry:
* uint32_t* xFP (should still be live, pointer to base of vregs)
*/
MterpExceptionReturn:
mov x0, #1 // signal return to caller.
b MterpDone
MterpReturn:
ldr x2, [xFP, #OFF_FP_RESULT_REGISTER]
ldr lr, [xSELF, #THREAD_FLAGS_OFFSET]
str x0, [x2]
mov x0, xSELF
ands lr, lr, #(THREAD_SUSPEND_REQUEST | THREAD_CHECKPOINT_REQUEST)
b.eq check2
bl MterpSuspendCheck // (self)
check2:
mov x0, #1 // signal return to caller.
MterpDone:
/*
* At this point, we expect wPROFILE to be non-zero. If negative, hotness is disabled or we're
* checking for OSR. If greater than zero, we might have unreported hotness to register
* (the difference between the ending wPROFILE and the cached hotness counter). wPROFILE
* should only reach zero immediately after a hotness decrement, and is then reset to either
* a negative special state or the new non-zero countdown value.
*/
cmp wPROFILE, #0
bgt MterpProfileActive // if > 0, we may have some counts to report.
ldp fp, lr, [sp, #64]
ldp xPC, xFP, [sp, #48]
ldp xSELF, xINST, [sp, #32]
ldp xIBASE, xREFS, [sp, #16]
ldp xPROFILE, x27, [sp], #80
ret
MterpProfileActive:
mov xINST, x0 // stash return value
/* Report cached hotness counts */
ldr x0, [xFP, #OFF_FP_METHOD]
add x1, xFP, #OFF_FP_SHADOWFRAME
mov x2, xSELF
strh wPROFILE, [x1, #SHADOWFRAME_HOTNESS_COUNTDOWN_OFFSET]
bl MterpAddHotnessBatch // (method, shadow_frame, self)
mov x0, xINST // restore return value
ldp fp, lr, [sp, #64]
ldp xPC, xFP, [sp, #48]
ldp xSELF, xINST, [sp, #32]
ldp xIBASE, xREFS, [sp, #16]
ldp xPROFILE, x27, [sp], #80
ret
.cfi_endproc
.size ExecuteMterpImpl, .-ExecuteMterpImpl