| %def footer(): |
| /* |
| * =========================================================================== |
| * Common subroutines and data |
| * =========================================================================== |
| */ |
| |
| .text |
| .align 2 |
| |
| /* |
| * 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 |
| move a0, rSELF |
| addu a1, rFP, OFF_FP_SHADOWFRAME |
| JAL(MterpLogDivideByZeroException) |
| #endif |
| b MterpCommonFallback |
| |
| common_errArrayIndex: |
| EXPORT_PC() |
| #if MTERP_LOGGING |
| move a0, rSELF |
| addu a1, rFP, OFF_FP_SHADOWFRAME |
| JAL(MterpLogArrayIndexException) |
| #endif |
| b MterpCommonFallback |
| |
| common_errNegativeArraySize: |
| EXPORT_PC() |
| #if MTERP_LOGGING |
| move a0, rSELF |
| addu a1, rFP, OFF_FP_SHADOWFRAME |
| JAL(MterpLogNegativeArraySizeException) |
| #endif |
| b MterpCommonFallback |
| |
| common_errNoSuchMethod: |
| EXPORT_PC() |
| #if MTERP_LOGGING |
| move a0, rSELF |
| addu a1, rFP, OFF_FP_SHADOWFRAME |
| JAL(MterpLogNoSuchMethodException) |
| #endif |
| b MterpCommonFallback |
| |
| common_errNullObject: |
| EXPORT_PC() |
| #if MTERP_LOGGING |
| move a0, rSELF |
| addu a1, rFP, OFF_FP_SHADOWFRAME |
| JAL(MterpLogNullObjectException) |
| #endif |
| b MterpCommonFallback |
| |
| common_exceptionThrown: |
| EXPORT_PC() |
| #if MTERP_LOGGING |
| move a0, rSELF |
| addu a1, rFP, OFF_FP_SHADOWFRAME |
| JAL(MterpLogExceptionThrownException) |
| #endif |
| b MterpCommonFallback |
| |
| MterpSuspendFallback: |
| EXPORT_PC() |
| #if MTERP_LOGGING |
| move a0, rSELF |
| addu a1, rFP, OFF_FP_SHADOWFRAME |
| lw a2, THREAD_FLAGS_OFFSET(rSELF) |
| JAL(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: |
| lw a0, THREAD_EXCEPTION_OFFSET(rSELF) |
| beqz a0, MterpFallback # If exception, 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: |
| move a0, rSELF |
| addu a1, rFP, OFF_FP_SHADOWFRAME |
| JAL(MterpHandleException) # (self, shadow_frame) |
| beqz v0, MterpExceptionReturn # no local catch, back to caller. |
| lw a0, OFF_FP_DEX_INSTRUCTIONS(rFP) |
| lw a1, OFF_FP_DEX_PC(rFP) |
| lw rIBASE, THREAD_CURRENT_IBASE_OFFSET(rSELF) |
| EAS1(rPC, a0, a1) # generate new dex_pc_ptr |
| /* Do we need to switch interpreters? */ |
| JAL(MterpShouldSwitchInterpreters) |
| bnez v0, MterpFallback |
| /* resume execution at catch block */ |
| EXPORT_PC() |
| FETCH_INST() |
| GET_INST_OPCODE(t0) |
| GOTO_OPCODE(t0) |
| /* NOTE: no fallthrough */ |
| |
| /* |
| * Common handling for branches with support for Jit profiling. |
| * On entry: |
| * rINST <= signed offset |
| * rPROFILE <= signed hotness countdown (expanded to 32 bits) |
| * |
| * 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: |
| bgtz rINST, .L_forward_branch # don't add forward branches to hotness |
| /* |
| * We need to subtract 1 from positive values and we should not see 0 here, |
| * so we may use the result of the comparison with -1. |
| */ |
| #if JIT_CHECK_OSR != -1 |
| # error "JIT_CHECK_OSR must be -1." |
| #endif |
| li t0, JIT_CHECK_OSR |
| beq rPROFILE, t0, .L_osr_check |
| blt rPROFILE, t0, .L_resume_backward_branch |
| subu rPROFILE, 1 |
| beqz rPROFILE, .L_add_batch # counted down to zero - report |
| .L_resume_backward_branch: |
| lw ra, THREAD_FLAGS_OFFSET(rSELF) |
| REFRESH_IBASE() |
| addu a2, rINST, rINST # a2<- byte offset |
| FETCH_ADVANCE_INST_RB(a2) # update rPC, load rINST |
| and ra, THREAD_SUSPEND_OR_CHECKPOINT_REQUEST |
| bnez ra, .L_suspend_request_pending |
| GET_INST_OPCODE(t0) # extract opcode from rINST |
| GOTO_OPCODE(t0) # jump to next instruction |
| |
| .L_suspend_request_pending: |
| EXPORT_PC() |
| move a0, rSELF |
| JAL(MterpSuspendCheck) # (self) |
| bnez v0, MterpFallback |
| REFRESH_IBASE() # might have changed during suspend |
| GET_INST_OPCODE(t0) # extract opcode from rINST |
| GOTO_OPCODE(t0) # jump to next instruction |
| |
| .L_no_count_backwards: |
| li t0, JIT_CHECK_OSR # check for possible OSR re-entry |
| bne rPROFILE, t0, .L_resume_backward_branch |
| .L_osr_check: |
| move a0, rSELF |
| addu a1, rFP, OFF_FP_SHADOWFRAME |
| move a2, rINST |
| EXPORT_PC() |
| JAL(MterpMaybeDoOnStackReplacement) # (self, shadow_frame, offset) |
| bnez v0, MterpOnStackReplacement |
| b .L_resume_backward_branch |
| |
| .L_forward_branch: |
| li t0, JIT_CHECK_OSR # check for possible OSR re-entry |
| beq rPROFILE, t0, .L_check_osr_forward |
| .L_resume_forward_branch: |
| add a2, rINST, rINST # a2<- byte offset |
| FETCH_ADVANCE_INST_RB(a2) # update rPC, load rINST |
| GET_INST_OPCODE(t0) # extract opcode from rINST |
| GOTO_OPCODE(t0) # jump to next instruction |
| |
| .L_check_osr_forward: |
| move a0, rSELF |
| addu a1, rFP, OFF_FP_SHADOWFRAME |
| move a2, rINST |
| EXPORT_PC() |
| JAL(MterpMaybeDoOnStackReplacement) # (self, shadow_frame, offset) |
| bnez v0, MterpOnStackReplacement |
| b .L_resume_forward_branch |
| |
| .L_add_batch: |
| addu a1, rFP, OFF_FP_SHADOWFRAME |
| sh rPROFILE, SHADOWFRAME_HOTNESS_COUNTDOWN_OFFSET(a1) |
| lw a0, OFF_FP_METHOD(rFP) |
| move a2, rSELF |
| JAL(MterpAddHotnessBatch) # (method, shadow_frame, self) |
| move rPROFILE, v0 # restore new hotness countdown to rPROFILE |
| 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: |
| move a0, rSELF |
| addu a1, rFP, OFF_FP_SHADOWFRAME |
| li a2, 2 |
| EXPORT_PC() |
| JAL(MterpMaybeDoOnStackReplacement) # (self, shadow_frame, offset) |
| bnez v0, MterpOnStackReplacement |
| FETCH_ADVANCE_INST(2) |
| GET_INST_OPCODE(t0) # extract opcode from rINST |
| GOTO_OPCODE(t0) # jump to next instruction |
| |
| /* |
| * On-stack replacement has happened, and now we've returned from the compiled method. |
| */ |
| MterpOnStackReplacement: |
| #if MTERP_LOGGING |
| move a0, rSELF |
| addu a1, rFP, OFF_FP_SHADOWFRAME |
| move a2, rINST |
| JAL(MterpLogOSR) |
| #endif |
| li v0, 1 # Signal normal return |
| b MterpDone |
| |
| /* |
| * Bail out to reference interpreter. |
| */ |
| MterpFallback: |
| EXPORT_PC() |
| #if MTERP_LOGGING |
| move a0, rSELF |
| addu a1, rFP, OFF_FP_SHADOWFRAME |
| JAL(MterpLogFallback) |
| #endif |
| MterpCommonFallback: |
| move v0, zero # 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* rFP (should still be live, pointer to base of vregs) |
| */ |
| MterpExceptionReturn: |
| li v0, 1 # signal return to caller. |
| b MterpDone |
| MterpReturn: |
| lw a2, OFF_FP_RESULT_REGISTER(rFP) |
| sw v0, 0(a2) |
| sw v1, 4(a2) |
| li v0, 1 # signal return to caller. |
| MterpDone: |
| /* |
| * At this point, we expect rPROFILE 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 rPROFILE and the cached hotness counter). rPROFILE |
| * 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. |
| */ |
| blez rPROFILE, .L_pop_and_return # if > 0, we may have some counts to report. |
| |
| MterpProfileActive: |
| move rINST, v0 # stash return value |
| /* Report cached hotness counts */ |
| lw a0, OFF_FP_METHOD(rFP) |
| addu a1, rFP, OFF_FP_SHADOWFRAME |
| move a2, rSELF |
| sh rPROFILE, SHADOWFRAME_HOTNESS_COUNTDOWN_OFFSET(a1) |
| JAL(MterpAddHotnessBatch) # (method, shadow_frame, self) |
| move v0, rINST # restore return value |
| |
| .L_pop_and_return: |
| /* Restore from the stack and return. Frame size = STACK_SIZE */ |
| STACK_LOAD_FULL() |
| jalr zero, ra |
| |
| .cfi_endproc |
| .end ExecuteMterpImpl |
