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-rw-r--r--rts/Exception.cmm242
1 files changed, 129 insertions, 113 deletions
diff --git a/rts/Exception.cmm b/rts/Exception.cmm
index 78907c4ba7..8a9f4e62c9 100644
--- a/rts/Exception.cmm
+++ b/rts/Exception.cmm
@@ -50,7 +50,8 @@ import ghczmprim_GHCziTypes_True_closure;
-------------------------------------------------------------------------- */
-INFO_TABLE_RET(stg_unmaskAsyncExceptionszh_ret, RET_SMALL)
+INFO_TABLE_RET(stg_unmaskAsyncExceptionszh_ret, RET_SMALL, W_ info_ptr)
+ /* explicit stack */
{
CInt r;
@@ -60,7 +61,7 @@ INFO_TABLE_RET(stg_unmaskAsyncExceptionszh_ret, RET_SMALL)
/* Eagerly raise a blocked exception, if there is one */
if (StgTSO_blocked_exceptions(CurrentTSO) != END_TSO_QUEUE) {
- STK_CHK_GEN( WDS(2), R1_PTR, stg_unmaskAsyncExceptionszh_ret_info);
+ STK_CHK_P (WDS(2), stg_unmaskAsyncExceptionszh_ret_info, R1);
/*
* We have to be very careful here, as in killThread#, since
* we are about to raise an async exception in the current
@@ -68,18 +69,18 @@ INFO_TABLE_RET(stg_unmaskAsyncExceptionszh_ret, RET_SMALL)
*/
Sp_adj(-2);
Sp(1) = R1;
- Sp(0) = stg_gc_unpt_r1_info;
+ Sp(0) = stg_ret_p_info;
SAVE_THREAD_STATE();
- (r) = foreign "C" maybePerformBlockedException (MyCapability() "ptr",
- CurrentTSO "ptr") [R1];
+ (r) = ccall maybePerformBlockedException (MyCapability() "ptr",
+ CurrentTSO "ptr");
if (r != 0::CInt) {
if (StgTSO_what_next(CurrentTSO) == ThreadKilled::I16) {
- jump stg_threadFinished;
+ jump stg_threadFinished [];
} else {
LOAD_THREAD_STATE();
ASSERT(StgTSO_what_next(CurrentTSO) == ThreadRunGHC::I16);
- jump %ENTRY_CODE(Sp(0));
+ jump %ENTRY_CODE(Sp(0)) [R1];
}
}
else {
@@ -93,10 +94,11 @@ INFO_TABLE_RET(stg_unmaskAsyncExceptionszh_ret, RET_SMALL)
}
Sp_adj(1);
- jump %ENTRY_CODE(Sp(0));
+ jump %ENTRY_CODE(Sp(0)) [R1];
}
-INFO_TABLE_RET(stg_maskAsyncExceptionszh_ret, RET_SMALL)
+INFO_TABLE_RET(stg_maskAsyncExceptionszh_ret, RET_SMALL, W_ info_ptr)
+ return (P_ ret)
{
StgTSO_flags(CurrentTSO) =
%lobits32(
@@ -104,11 +106,11 @@ INFO_TABLE_RET(stg_maskAsyncExceptionszh_ret, RET_SMALL)
| TSO_BLOCKEX | TSO_INTERRUPTIBLE
);
- Sp_adj(1);
- jump %ENTRY_CODE(Sp(0));
+ return (ret);
}
-INFO_TABLE_RET(stg_maskUninterruptiblezh_ret, RET_SMALL)
+INFO_TABLE_RET(stg_maskUninterruptiblezh_ret, RET_SMALL, W_ info_ptr)
+ return (P_ ret)
{
StgTSO_flags(CurrentTSO) =
%lobits32(
@@ -117,14 +119,13 @@ INFO_TABLE_RET(stg_maskUninterruptiblezh_ret, RET_SMALL)
& ~TSO_INTERRUPTIBLE
);
- Sp_adj(1);
- jump %ENTRY_CODE(Sp(0));
+ return (ret);
}
-stg_maskAsyncExceptionszh
+stg_maskAsyncExceptionszh /* explicit stack */
{
/* Args: R1 :: IO a */
- STK_CHK_GEN( WDS(1)/* worst case */, R1_PTR, stg_maskAsyncExceptionszh);
+ STK_CHK_P( WDS(1)/* worst case */, stg_maskAsyncExceptionszh, R1);
if ((TO_W_(StgTSO_flags(CurrentTSO)) & TSO_BLOCKEX) == 0) {
/* avoid growing the stack unnecessarily */
@@ -146,13 +147,13 @@ stg_maskAsyncExceptionszh
TICK_UNKNOWN_CALL();
TICK_SLOW_CALL_v();
- jump stg_ap_v_fast;
+ jump stg_ap_v_fast [R1];
}
-stg_maskUninterruptiblezh
+stg_maskUninterruptiblezh /* explicit stack */
{
/* Args: R1 :: IO a */
- STK_CHK_GEN( WDS(1)/* worst case */, R1_PTR, stg_maskAsyncExceptionszh);
+ STK_CHK_P( WDS(1)/* worst case */, stg_maskAsyncExceptionszh, R1);
if ((TO_W_(StgTSO_flags(CurrentTSO)) & TSO_BLOCKEX) == 0) {
/* avoid growing the stack unnecessarily */
@@ -174,16 +175,16 @@ stg_maskUninterruptiblezh
TICK_UNKNOWN_CALL();
TICK_SLOW_CALL_v();
- jump stg_ap_v_fast;
+ jump stg_ap_v_fast [R1];
}
-stg_unmaskAsyncExceptionszh
+stg_unmaskAsyncExceptionszh /* explicit stack */
{
CInt r;
W_ level;
/* Args: R1 :: IO a */
- STK_CHK_GEN( WDS(4), R1_PTR, stg_unmaskAsyncExceptionszh);
+ STK_CHK_P (WDS(4), stg_unmaskAsyncExceptionszh, R1);
/* 4 words: one for the unblock frame, 3 for setting up the
* stack to call maybePerformBlockedException() below.
*/
@@ -225,16 +226,16 @@ stg_unmaskAsyncExceptionszh
Sp(0) = stg_enter_info;
SAVE_THREAD_STATE();
- (r) = foreign "C" maybePerformBlockedException (MyCapability() "ptr",
- CurrentTSO "ptr") [R1];
+ (r) = ccall maybePerformBlockedException (MyCapability() "ptr",
+ CurrentTSO "ptr");
if (r != 0::CInt) {
if (StgTSO_what_next(CurrentTSO) == ThreadKilled::I16) {
- jump stg_threadFinished;
+ jump stg_threadFinished [];
} else {
LOAD_THREAD_STATE();
ASSERT(StgTSO_what_next(CurrentTSO) == ThreadRunGHC::I16);
- jump %ENTRY_CODE(Sp(0));
+ jump %ENTRY_CODE(Sp(0)) [R1];
}
} else {
/* we'll just call R1 directly, below */
@@ -245,11 +246,11 @@ stg_unmaskAsyncExceptionszh
}
TICK_UNKNOWN_CALL();
TICK_SLOW_CALL_v();
- jump stg_ap_v_fast;
+ jump stg_ap_v_fast [R1];
}
-stg_getMaskingStatezh
+stg_getMaskingStatezh ()
{
/* args: none */
/*
@@ -257,25 +258,18 @@ stg_getMaskingStatezh
1 == masked, non-interruptible,
2 == masked, interruptible
*/
- RET_N(((TO_W_(StgTSO_flags(CurrentTSO)) & TSO_BLOCKEX) != 0) +
- ((TO_W_(StgTSO_flags(CurrentTSO)) & TSO_INTERRUPTIBLE) != 0));
+ return (((TO_W_(StgTSO_flags(CurrentTSO)) & TSO_BLOCKEX) != 0) +
+ ((TO_W_(StgTSO_flags(CurrentTSO)) & TSO_INTERRUPTIBLE) != 0));
}
-stg_killThreadzh
+stg_killThreadzh (P_ target, P_ exception)
{
- /* args: R1 = TSO to kill, R2 = Exception */
-
W_ why_blocked;
- W_ target;
- W_ exception;
-
- target = R1;
- exception = R2;
-
+
/* Needs 3 words because throwToSingleThreaded uses some stack */
- STK_CHK_GEN( WDS(3), R1_PTR & R2_PTR, stg_killThreadzh);
+ STK_CHK_PP (WDS(3), stg_killThreadzh, target, exception);
/* We call allocate in throwTo(), so better check for GC */
- MAYBE_GC(R1_PTR & R2_PTR, stg_killThreadzh);
+ MAYBE_GC_PP (stg_killThreadzh, target, exception);
/*
* We might have killed ourselves. In which case, better be *very*
@@ -292,58 +286,75 @@ stg_killThreadzh
* happens: on resumption, we will just jump to the next frame on
* the stack, which is the return point for stg_killThreadzh.
*/
- SAVE_THREAD_STATE();
- /* ToDo: what if the current thread is blocking exceptions? */
- foreign "C" throwToSingleThreaded(MyCapability() "ptr",
- target "ptr", exception "ptr")[R1,R2];
- if (StgTSO_what_next(CurrentTSO) == ThreadKilled::I16) {
- jump stg_threadFinished;
- } else {
- LOAD_THREAD_STATE();
- ASSERT(StgTSO_what_next(CurrentTSO) == ThreadRunGHC::I16);
- jump %ENTRY_CODE(Sp(0));
- }
+ R1 = target;
+ R2 = exception;
+ jump stg_killMyself [R1,R2];
} else {
- W_ out;
- W_ msg;
- out = Sp - WDS(1); /* ok to re-use stack space here */
+ W_ msg;
- (msg) = foreign "C" throwTo(MyCapability() "ptr",
+ (msg) = ccall throwTo(MyCapability() "ptr",
CurrentTSO "ptr",
target "ptr",
- exception "ptr") [R1,R2];
+ exception "ptr");
if (msg == NULL) {
- jump %ENTRY_CODE(Sp(0));
- } else {
+ return ();
+ } else {
StgTSO_why_blocked(CurrentTSO) = BlockedOnMsgThrowTo;
StgTSO_block_info(CurrentTSO) = msg;
// we must block, and unlock the message before returning
- jump stg_block_throwto;
+ jump stg_block_throwto (target, exception);
}
}
}
+/*
+ * We must switch into low-level Cmm in order to raise an exception in
+ * the current thread, hence this is in a separate proc with arguments
+ * passed explicitly in R1 and R2.
+ */
+stg_killMyself
+{
+ P_ target, exception;
+ target = R1;
+ exception = R2;
+
+ SAVE_THREAD_STATE();
+ /* ToDo: what if the current thread is blocking exceptions? */
+ ccall throwToSingleThreaded(MyCapability() "ptr",
+ target "ptr", exception "ptr");
+ if (StgTSO_what_next(CurrentTSO) == ThreadKilled::I16) {
+ jump stg_threadFinished [];
+ } else {
+ LOAD_THREAD_STATE();
+ ASSERT(StgTSO_what_next(CurrentTSO) == ThreadRunGHC::I16);
+ jump %ENTRY_CODE(Sp(0)) [];
+ }
+}
+
/* -----------------------------------------------------------------------------
Catch frames
-------------------------------------------------------------------------- */
-#define SP_OFF 0
-
/* Catch frames are very similar to update frames, but when entering
* one we just pop the frame off the stack and perform the correct
* kind of return to the activation record underneath us on the stack.
*/
+#define CATCH_FRAME_FIELDS(w_,p_,info_ptr,exceptions_blocked,handler) \
+ w_ info_ptr, \
+ PROF_HDR_FIELDS(w_) \
+ w_ exceptions_blocked, \
+ p_ handler
+
+
INFO_TABLE_RET(stg_catch_frame, CATCH_FRAME,
-#if defined(PROFILING)
- W_ unused1, W_ unused2,
-#endif
- W_ unused3, P_ unused4)
- {
- Sp = Sp + SIZEOF_StgCatchFrame;
- jump %ENTRY_CODE(Sp(SP_OFF));
- }
+ CATCH_FRAME_FIELDS(W_,P_,info_ptr,
+ exceptions_blocked,handler))
+ return (P_ ret)
+{
+ return (ret);
+}
/* -----------------------------------------------------------------------------
* The catch infotable
@@ -356,30 +367,30 @@ INFO_TABLE_RET(stg_catch_frame, CATCH_FRAME,
* -------------------------------------------------------------------------- */
INFO_TABLE(stg_catch,2,0,FUN,"catch","catch")
+ (P_ node)
{
- R2 = StgClosure_payload(R1,1); /* h */
- R1 = StgClosure_payload(R1,0); /* x */
- jump stg_catchzh;
+ jump stg_catchzh(StgClosure_payload(node,0),StgClosure_payload(node,1));
}
-stg_catchzh
+stg_catchzh ( P_ io, /* :: IO a */
+ P_ handler /* :: Exception -> IO a */ )
{
- /* args: R1 = m :: IO a, R2 = handler :: Exception -> IO a */
- STK_CHK_GEN(SIZEOF_StgCatchFrame + WDS(1), R1_PTR & R2_PTR, stg_catchzh);
+ W_ exceptions_blocked;
+
+ STK_CHK_GEN();
- /* Set up the catch frame */
- Sp = Sp - SIZEOF_StgCatchFrame;
- SET_HDR(Sp,stg_catch_frame_info,CCCS);
-
- StgCatchFrame_handler(Sp) = R2;
- StgCatchFrame_exceptions_blocked(Sp) =
+ exceptions_blocked =
TO_W_(StgTSO_flags(CurrentTSO)) & (TSO_BLOCKEX | TSO_INTERRUPTIBLE);
TICK_CATCHF_PUSHED();
/* Apply R1 to the realworld token */
TICK_UNKNOWN_CALL();
TICK_SLOW_CALL_v();
- jump stg_ap_v_fast;
+
+ jump stg_ap_v_fast
+ (CATCH_FRAME_FIELDS(,,stg_catch_frame_info,
+ exceptions_blocked, handler))
+ (io);
}
/* -----------------------------------------------------------------------------
@@ -394,28 +405,33 @@ stg_catchzh
INFO_TABLE(stg_raise,1,0,THUNK_1_0,"raise","raise")
{
- R1 = StgThunk_payload(R1,0);
- jump stg_raisezh;
+ jump stg_raisezh(StgThunk_payload(R1,0));
}
section "data" {
no_break_on_exception: W_[1];
}
-INFO_TABLE_RET(stg_raise_ret, RET_SMALL, P_ arg1)
+INFO_TABLE_RET(stg_raise_ret, RET_SMALL, W_ info_ptr, P_ exception)
+ return (P_ ret)
{
- R1 = Sp(1);
- Sp = Sp + WDS(2);
- W_[no_break_on_exception] = 1;
- jump stg_raisezh;
+ W_[no_break_on_exception] = 1;
+ jump stg_raisezh (exception);
}
-stg_raisezh
+stg_raisezh /* explicit stack */
+/*
+ * args : R1 :: Exception
+ *
+ * Here we assume that the NativeNodeCall convention always puts the
+ * first argument in R1 (which it does). We cannot use high-level cmm
+ * due to all the LOAD_THREAD_STATE()/SAVE_THREAD_STATE() and stack
+ * walking that happens in here.
+ */
{
W_ handler;
W_ frame_type;
W_ exception;
- /* args : R1 :: Exception */
exception = R1;
@@ -427,16 +443,16 @@ stg_raisezh
*/
if (RtsFlags_ProfFlags_showCCSOnException(RtsFlags) != 0::I32) {
SAVE_THREAD_STATE();
- foreign "C" fprintCCS_stderr(CCCS "ptr",
+ ccall fprintCCS_stderr(CCCS "ptr",
exception "ptr",
- CurrentTSO "ptr") [];
+ CurrentTSO "ptr");
LOAD_THREAD_STATE();
}
#endif
retry_pop_stack:
SAVE_THREAD_STATE();
- (frame_type) = foreign "C" raiseExceptionHelper(BaseReg "ptr", CurrentTSO "ptr", exception "ptr") [];
+ (frame_type) = ccall raiseExceptionHelper(BaseReg "ptr", CurrentTSO "ptr", exception "ptr");
LOAD_THREAD_STATE();
if (frame_type == ATOMICALLY_FRAME) {
/* The exception has reached the edge of a memory transaction. Check that
@@ -450,14 +466,14 @@ retry_pop_stack:
W_ trec, outer;
W_ r;
trec = StgTSO_trec(CurrentTSO);
- (r) = foreign "C" stmValidateNestOfTransactions(trec "ptr") [];
+ (r) = ccall stmValidateNestOfTransactions(trec "ptr");
outer = StgTRecHeader_enclosing_trec(trec);
- foreign "C" stmAbortTransaction(MyCapability() "ptr", trec "ptr") [];
- foreign "C" stmFreeAbortedTRec(MyCapability() "ptr", trec "ptr") [];
+ ccall stmAbortTransaction(MyCapability() "ptr", trec "ptr");
+ ccall stmFreeAbortedTRec(MyCapability() "ptr", trec "ptr");
if (outer != NO_TREC) {
- foreign "C" stmAbortTransaction(MyCapability() "ptr", outer "ptr") [];
- foreign "C" stmFreeAbortedTRec(MyCapability() "ptr", outer "ptr") [];
+ ccall stmAbortTransaction(MyCapability() "ptr", outer "ptr");
+ ccall stmFreeAbortedTRec(MyCapability() "ptr", outer "ptr");
}
StgTSO_trec(CurrentTSO) = NO_TREC;
@@ -468,10 +484,10 @@ retry_pop_stack:
} else {
// Transaction was not valid: we retry the exception (otherwise continue
// with a further call to raiseExceptionHelper)
- ("ptr" trec) = foreign "C" stmStartTransaction(MyCapability() "ptr", NO_TREC "ptr") [];
+ ("ptr" trec) = ccall stmStartTransaction(MyCapability() "ptr", NO_TREC "ptr");
StgTSO_trec(CurrentTSO) = trec;
R1 = StgAtomicallyFrame_code(Sp);
- jump stg_ap_v_fast;
+ jump stg_ap_v_fast [R1];
}
}
@@ -492,7 +508,7 @@ retry_pop_stack:
// for exmplae. Perhaps the stop_on_exception flag should
// be per-thread.
CInt[rts_stop_on_exception] = 0;
- ("ptr" ioAction) = foreign "C" deRefStablePtr (W_[rts_breakpoint_io_action] "ptr") [];
+ ("ptr" ioAction) = ccall deRefStablePtr (W_[rts_breakpoint_io_action] "ptr");
Sp = Sp - WDS(6);
Sp(5) = exception;
Sp(4) = stg_raise_ret_info;
@@ -500,7 +516,7 @@ retry_pop_stack:
Sp(2) = ghczmprim_GHCziTypes_True_closure; // dummy breakpoint info
Sp(1) = ghczmprim_GHCziTypes_True_closure; // True <=> a breakpoint
R1 = ioAction;
- jump RET_LBL(stg_ap_pppv);
+ jump RET_LBL(stg_ap_pppv) [R1];
}
}
@@ -519,11 +535,12 @@ retry_pop_stack:
StgTSO_what_next(CurrentTSO) = ThreadKilled::I16;
SAVE_THREAD_STATE(); /* inline! */
- jump stg_threadFinished;
+ jump stg_threadFinished [];
}
- /* Ok, Sp points to the enclosing CATCH_FRAME or CATCH_STM_FRAME. Pop everything
- * down to and including this frame, update Su, push R1, and enter the handler.
+ /* Ok, Sp points to the enclosing CATCH_FRAME or CATCH_STM_FRAME.
+ * Pop everything down to and including this frame, update Su,
+ * push R1, and enter the handler.
*/
if (frame_type == CATCH_FRAME) {
handler = StgCatchFrame_handler(Sp);
@@ -572,8 +589,8 @@ retry_pop_stack:
W_ trec, outer;
trec = StgTSO_trec(CurrentTSO);
outer = StgTRecHeader_enclosing_trec(trec);
- foreign "C" stmAbortTransaction(MyCapability() "ptr", trec "ptr") [];
- foreign "C" stmFreeAbortedTRec(MyCapability() "ptr", trec "ptr") [];
+ ccall stmAbortTransaction(MyCapability() "ptr", trec "ptr");
+ ccall stmFreeAbortedTRec(MyCapability() "ptr", trec "ptr");
StgTSO_trec(CurrentTSO) = outer;
Sp = Sp + SIZEOF_StgCatchSTMFrame;
}
@@ -587,11 +604,10 @@ retry_pop_stack:
Sp_adj(-1);
TICK_UNKNOWN_CALL();
TICK_SLOW_CALL_pv();
- jump RET_LBL(stg_ap_pv);
+ jump RET_LBL(stg_ap_pv) [R1];
}
-stg_raiseIOzh
+stg_raiseIOzh (P_ exception)
{
- /* Args :: R1 :: Exception */
- jump stg_raisezh;
+ jump stg_raisezh (exception);
}
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