#include "Cmm.h"
#include "RaiseAsync.h"
+import ghczmprim_GHCziBool_True_closure;
+
/* -----------------------------------------------------------------------------
Exception Primitives
unsafePerformIO thunk will be updated with a stack object
containing the unblockAsyncExceptions_ret frame. Later, when
someone else evaluates this thunk, the blocked exception state is
- not restored, and the result is that unblockAsyncExceptions_ret
- will attempt to unblock exceptions in the current thread, but it'll
- find that the CurrentTSO->blocked_exceptions is NULL. Hence, we
- work around this by checking for NULL in awakenBlockedQueue().
+ not restored.
-------------------------------------------------------------------------- */
-INFO_TABLE_RET( stg_unblockAsyncExceptionszh_ret,
- 0/*framesize*/, 0/*bitmap*/, RET_SMALL )
+INFO_TABLE_RET( stg_unblockAsyncExceptionszh_ret, RET_SMALL )
{
CInt r;
- // Not true: see comments above
- // ASSERT(StgTSO_blocked_exceptions(CurrentTSO) != NULL);
-
StgTSO_flags(CurrentTSO) = StgTSO_flags(CurrentTSO) &
~(TSO_BLOCKEX::I32|TSO_INTERRUPTIBLE::I32);
*/
Sp_adj(1);
#endif
+ STK_CHK_GEN( WDS(2), R1_PTR, stg_unblockAsyncExceptionszh_ret_info);
+ Sp_adj(-2);
+ Sp(1) = R1;
+#ifdef REG_R1
+ Sp(0) = stg_gc_unpt_r1_info;
+#else
+ Sp(0) = stg_ut_1_0_unreg_info;
+#endif
SAVE_THREAD_STATE();
- r = foreign "C" maybePerformBlockedException (MyCapability() "ptr",
+ (r) = foreign "C" maybePerformBlockedException (MyCapability() "ptr",
CurrentTSO "ptr") [R1];
if (r != 0::CInt) {
#endif
}
-INFO_TABLE_RET( stg_blockAsyncExceptionszh_ret,
- 0/*framesize*/, 0/*bitmap*/, RET_SMALL )
+INFO_TABLE_RET( stg_blockAsyncExceptionszh_ret, RET_SMALL )
{
- // Not true: see comments above
- // ASSERT(StgTSO_blocked_exceptions(CurrentTSO) == NULL);
-
StgTSO_flags(CurrentTSO) =
StgTSO_flags(CurrentTSO) | TSO_BLOCKEX::I32 | TSO_INTERRUPTIBLE::I32;
* thread, which might result in the thread being killed.
*/
SAVE_THREAD_STATE();
- r = foreign "C" maybePerformBlockedException (MyCapability() "ptr",
+ (r) = foreign "C" maybePerformBlockedException (MyCapability() "ptr",
CurrentTSO "ptr") [R1];
if (r != 0::CInt) {
* If the exception went to a catch frame, we'll just continue from
* the handler.
*/
+ loop:
+ if (StgTSO_what_next(target) == ThreadRelocated::I16) {
+ target = StgTSO_link(target);
+ goto loop;
+ }
if (target == CurrentTSO) {
SAVE_THREAD_STATE();
/* ToDo: what if the current thread is blocking exceptions? */
W_ retcode;
out = BaseReg + OFFSET_StgRegTable_rmp_tmp_w;
- retcode = foreign "C" throwTo(MyCapability() "ptr",
+ (retcode) = foreign "C" throwTo(MyCapability() "ptr",
CurrentTSO "ptr",
target "ptr",
exception "ptr",
#define SP_OFF 1
#endif
-#if defined(PROFILING)
-#define CATCH_FRAME_BITMAP 7
-#define CATCH_FRAME_WORDS 4
-#else
-#define CATCH_FRAME_BITMAP 1
-#define CATCH_FRAME_WORDS 2
-#endif
-
/* 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.
*/
-INFO_TABLE_RET(stg_catch_frame,
- CATCH_FRAME_WORDS, CATCH_FRAME_BITMAP,
- CATCH_FRAME)
+INFO_TABLE_RET(stg_catch_frame, CATCH_FRAME,
+#if defined(PROFILING)
+ W_ unused1, W_ unused2,
+#endif
+ W_ unused3, "ptr" W_ unused4)
#ifdef REG_R1
{
Sp = Sp + SIZEOF_StgCatchFrame;
no_break_on_exception: W_[1];
}
-INFO_TABLE_RET(stg_raise_ret, 1, 0, RET_SMALL)
+INFO_TABLE_RET(stg_raise_ret, RET_SMALL, "ptr" W_ arg1)
{
R1 = Sp(1);
Sp = Sp + WDS(2);
}
#endif
- if (W_[no_break_on_exception] != 0) {
- W_[no_break_on_exception] = 0;
- } else {
- if (TO_W_(CInt[rts_stop_on_exception]) != 0) {
- W_ ioAction;
- // we don't want any further exceptions to be caught,
- // until GHCi is ready to handle them. This prevents
- // deadlock if an exception is raised in InteractiveUI,
- // for exmplae. Perhaps the stop_on_exception flag should
- // be per-thread.
- W_[rts_stop_on_exception] = 0;
- "ptr" ioAction = foreign "C" deRefStablePtr (W_[rts_breakpoint_io_action] "ptr") [];
- Sp = Sp - WDS(6);
- Sp(5) = exception;
- Sp(4) = stg_raise_ret_info;
- Sp(3) = exception; // the AP_STACK
- Sp(2) = base_GHCziBase_True_closure; // dummy breakpoint info
- Sp(1) = base_GHCziBase_True_closure; // True <=> a breakpoint
- R1 = ioAction;
- jump stg_ap_pppv_info;
- }
- }
-
- /* Inform the Hpc that an exception has been thrown */
- foreign "C" hs_hpc_raise_event(CurrentTSO "ptr") [];
-
retry_pop_stack:
StgTSO_sp(CurrentTSO) = Sp;
- frame_type = foreign "C" raiseExceptionHelper(BaseReg "ptr", CurrentTSO "ptr", exception "ptr") [];
+ (frame_type) = foreign "C" raiseExceptionHelper(BaseReg "ptr", CurrentTSO "ptr", exception "ptr") [];
Sp = StgTSO_sp(CurrentTSO);
if (frame_type == ATOMICALLY_FRAME) {
/* The exception has reached the edge of a memory transaction. Check that
W_ trec, outer;
W_ r;
trec = StgTSO_trec(CurrentTSO);
- r = foreign "C" stmValidateNestOfTransactions(trec "ptr") [];
- "ptr" outer = foreign "C" stmGetEnclosingTRec(trec "ptr") [];
+ (r) = foreign "C" stmValidateNestOfTransactions(trec "ptr") [];
+ ("ptr" outer) = foreign "C" stmGetEnclosingTRec(trec "ptr") [];
foreign "C" stmAbortTransaction(MyCapability() "ptr", trec "ptr") [];
foreign "C" stmFreeAbortedTRec(MyCapability() "ptr", trec "ptr") [];
} 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) = foreign "C" stmStartTransaction(MyCapability() "ptr", NO_TREC "ptr") [];
StgTSO_trec(CurrentTSO) = trec;
R1 = StgAtomicallyFrame_code(Sp);
jump stg_ap_v_fast;
}
}
+ // After stripping the stack, see whether we should break here for
+ // GHCi (c.f. the -fbreak-on-exception flag). We do this after
+ // stripping the stack for a reason: we'll be inspecting values in
+ // GHCi, and it helps if all the thunks under evaluation have
+ // already been updated with the exception, rather than being left
+ // as blackholes.
+ if (W_[no_break_on_exception] != 0) {
+ W_[no_break_on_exception] = 0;
+ } else {
+ if (TO_W_(CInt[rts_stop_on_exception]) != 0) {
+ W_ ioAction;
+ // we don't want any further exceptions to be caught,
+ // until GHCi is ready to handle them. This prevents
+ // deadlock if an exception is raised in InteractiveUI,
+ // for exmplae. Perhaps the stop_on_exception flag should
+ // be per-thread.
+ W_[rts_stop_on_exception] = 0;
+ ("ptr" ioAction) = foreign "C" deRefStablePtr (W_[rts_breakpoint_io_action] "ptr") [];
+ Sp = Sp - WDS(7);
+ Sp(6) = exception;
+ Sp(5) = stg_raise_ret_info;
+ Sp(4) = stg_noforceIO_info; // required for unregisterised
+ Sp(3) = exception; // the AP_STACK
+ Sp(2) = ghczmprim_GHCziBool_True_closure; // dummy breakpoint info
+ Sp(1) = ghczmprim_GHCziBool_True_closure; // True <=> a breakpoint
+ R1 = ioAction;
+ jump RET_LBL(stg_ap_pppv);
+ }
+ }
+
if (frame_type == STOP_FRAME) {
/*
* We've stripped the entire stack, the thread is now dead.
} else {
W_ trec, outer;
trec = StgTSO_trec(CurrentTSO);
- "ptr" outer = foreign "C" stmGetEnclosingTRec(trec "ptr") [];
+ ("ptr" outer) = foreign "C" stmGetEnclosingTRec(trec "ptr") [];
foreign "C" stmAbortTransaction(MyCapability() "ptr", trec "ptr") [];
foreign "C" stmFreeAbortedTRec(MyCapability() "ptr", trec "ptr") [];
StgTSO_trec(CurrentTSO) = outer;
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