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%def bincmp(condition=""):
/*
* Generic two-operand compare-and-branch operation. Provide a "condition"
* fragment that specifies the comparison to perform.
*
* For: if-eq, if-ne, if-lt, if-ge, if-gt, if-le
*/
/* if-cmp vA, vB, +CCCC */
lsr w1, wINST, #12 // w1<- B
ubfx w0, wINST, #8, #4 // w0<- A
GET_VREG w3, w1 // w3<- vB
GET_VREG w2, w0 // w2<- vA
FETCH_S wINST, 1 // wINST<- branch offset, in code units
cmp w2, w3 // compare (vA, vB)
b.${condition} MterpCommonTakenBranchNoFlags
cmp wPROFILE, #JIT_CHECK_OSR // possible OSR re-entry?
b.eq .L_check_not_taken_osr
FETCH_ADVANCE_INST 2
GET_INST_OPCODE ip // extract opcode from wINST
GOTO_OPCODE ip // jump to next instruction
%def zcmp(compare="1", branch=""):
/*
* Generic one-operand compare-and-branch operation. Provide a "condition"
* fragment that specifies the comparison to perform.
*
* for: if-eqz, if-nez, if-ltz, if-gez, if-gtz, if-lez
*/
/* if-cmp vAA, +BBBB */
lsr w0, wINST, #8 // w0<- AA
GET_VREG w2, w0 // w2<- vAA
FETCH_S wINST, 1 // w1<- branch offset, in code units
.if ${compare}
cmp w2, #0 // compare (vA, 0)
.endif
${branch} MterpCommonTakenBranchNoFlags
cmp wPROFILE, #JIT_CHECK_OSR // possible OSR re-entry?
b.eq .L_check_not_taken_osr
FETCH_ADVANCE_INST 2
GET_INST_OPCODE ip // extract opcode from wINST
GOTO_OPCODE ip // jump to next instruction
%def op_goto():
/*
* Unconditional branch, 8-bit offset.
*
* The branch distance is a signed code-unit offset, which we need to
* double to get a byte offset.
*/
/* goto +AA */
sbfx wINST, wINST, #8, #8 // wINST<- ssssssAA (sign-extended)
b MterpCommonTakenBranchNoFlags
%def op_goto_16():
/*
* Unconditional branch, 16-bit offset.
*
* The branch distance is a signed code-unit offset, which we need to
* double to get a byte offset.
*/
/* goto/16 +AAAA */
FETCH_S wINST, 1 // wINST<- ssssAAAA (sign-extended)
b MterpCommonTakenBranchNoFlags
%def op_goto_32():
/*
* Unconditional branch, 32-bit offset.
*
* The branch distance is a signed code-unit offset, which we need to
* double to get a byte offset.
*
* Unlike most opcodes, this one is allowed to branch to itself, so
* our "backward branch" test must be "<=0" instead of "<0". Because
* we need the V bit set, we'll use an adds to convert from Dalvik
* offset to byte offset.
*/
/* goto/32 +AAAAAAAA */
FETCH w0, 1 // w0<- aaaa (lo)
FETCH w1, 2 // w1<- AAAA (hi)
orr wINST, w0, w1, lsl #16 // wINST<- AAAAaaaa
b MterpCommonTakenBranchNoFlags
%def op_if_eq():
% bincmp(condition="eq")
%def op_if_eqz():
% zcmp(compare="0", branch="cbz w2,")
%def op_if_ge():
% bincmp(condition="ge")
%def op_if_gez():
% zcmp(compare="0", branch="tbz w2, #31,")
%def op_if_gt():
% bincmp(condition="gt")
%def op_if_gtz():
% zcmp(branch="b.gt")
%def op_if_le():
% bincmp(condition="le")
%def op_if_lez():
% zcmp(branch="b.le")
%def op_if_lt():
% bincmp(condition="lt")
%def op_if_ltz():
% zcmp(compare="0", branch="tbnz w2, #31,")
%def op_if_ne():
% bincmp(condition="ne")
%def op_if_nez():
% zcmp(compare="0", branch="cbnz w2,")
%def op_packed_switch(func="MterpDoPackedSwitch"):
/*
* Handle a packed-switch or sparse-switch instruction. In both cases
* we decode it and hand it off to a helper function.
*
* We don't really expect backward branches in a switch statement, but
* they're perfectly legal, so we check for them here.
*
* for: packed-switch, sparse-switch
*/
/* op vAA, +BBBB */
FETCH w0, 1 // x0<- 000000000000bbbb (lo)
FETCH_S x1, 2 // x1<- ssssssssssssBBBB (hi)
lsr w3, wINST, #8 // w3<- AA
orr x0, x0, x1, lsl #16 // x0<- ssssssssBBBBbbbb
GET_VREG w1, w3 // w1<- vAA
add x0, xPC, x0, lsl #1 // x0<- PC + ssssssssBBBBbbbb*2
bl $func // w0<- code-unit branch offset
sxtw xINST, w0
b MterpCommonTakenBranchNoFlags
%def op_return():
/*
* Return a 32-bit value.
*
* for: return, return-object
*/
/* op vAA */
.extern MterpThreadFenceForConstructor
bl MterpThreadFenceForConstructor
ldr w7, [xSELF, #THREAD_FLAGS_OFFSET]
mov x0, xSELF
ands w7, w7, #THREAD_SUSPEND_OR_CHECKPOINT_REQUEST
b.ne .L${opcode}_check
.L${opcode}_return:
lsr w2, wINST, #8 // r2<- AA
GET_VREG w0, w2 // r0<- vAA
b MterpReturn
.L${opcode}_check:
bl MterpSuspendCheck // (self)
b .L${opcode}_return
%def op_return_object():
% op_return()
%def op_return_void():
.extern MterpThreadFenceForConstructor
bl MterpThreadFenceForConstructor
ldr w7, [xSELF, #THREAD_FLAGS_OFFSET]
mov x0, xSELF
ands w7, w7, #THREAD_SUSPEND_OR_CHECKPOINT_REQUEST
b.ne .L${opcode}_check
.L${opcode}_return:
mov x0, #0
b MterpReturn
.L${opcode}_check:
bl MterpSuspendCheck // (self)
b .L${opcode}_return
%def op_return_wide():
/*
* Return a 64-bit value.
*/
/* return-wide vAA */
/* op vAA */
.extern MterpThreadFenceForConstructor
bl MterpThreadFenceForConstructor
ldr w7, [xSELF, #THREAD_FLAGS_OFFSET]
mov x0, xSELF
ands w7, w7, #THREAD_SUSPEND_OR_CHECKPOINT_REQUEST
b.ne .L${opcode}_check
.L${opcode}_return:
lsr w2, wINST, #8 // w2<- AA
GET_VREG_WIDE x0, w2 // x0<- vAA
b MterpReturn
.L${opcode}_check:
bl MterpSuspendCheck // (self)
b .L${opcode}_return
%def op_sparse_switch():
% op_packed_switch(func="MterpDoSparseSwitch")
%def op_throw():
/*
* Throw an exception object in the current thread.
*/
/* throw vAA */
EXPORT_PC
lsr w2, wINST, #8 // r2<- AA
GET_VREG w1, w2 // r1<- vAA (exception object)
cbz w1, common_errNullObject
str x1, [xSELF, #THREAD_EXCEPTION_OFFSET] // thread->exception<- obj
b MterpException
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