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PrimOps.cmm
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PrimOps.cmm
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/* -----------------------------------------------------------------------------
*
* (c) The GHC Team, 1998-2011
*
* Out-of-line primitive operations
*
* This file contains the implementations of all the primitive
* operations ("primops") which are not expanded inline. See
* ghc/compiler/prelude/primops.txt.pp for a list of all the primops;
* this file contains code for most of those with the attribute
* out_of_line=True.
*
* Entry convention: the entry convention for a primop is that all the
* args are in Stg registers (R1, R2, etc.). This is to make writing
* the primops easier. (see compiler/codeGen/CgCallConv.hs).
*
* Return convention: results from a primop are generally returned
* using the ordinary unboxed tuple return convention. The C-- parser
* implements the RET_xxxx() macros to perform unboxed-tuple returns
* based on the prevailing return convention.
*
* This file is written in a subset of C--, extended with various
* features specific to GHC. It is compiled by GHC directly. For the
* syntax of .cmm files, see the parser in ghc/compiler/cmm/CmmParse.y.
*
* ---------------------------------------------------------------------------*/
#include "Cmm.h"
#ifdef __PIC__
import pthread_mutex_lock;
import pthread_mutex_unlock;
#endif
import base_ControlziExceptionziBase_nestedAtomically_closure;
import EnterCriticalSection;
import LeaveCriticalSection;
import ghczmprim_GHCziTypes_False_closure;
#if !defined(mingw32_HOST_OS)
import sm_mutex;
#endif
/*-----------------------------------------------------------------------------
Array Primitives
Basically just new*Array - the others are all inline macros.
The size arg is always passed in R1, and the result returned in R1.
The slow entry point is for returning from a heap check, the saved
size argument must be re-loaded from the stack.
-------------------------------------------------------------------------- */
/* for objects that are *less* than the size of a word, make sure we
* round up to the nearest word for the size of the array.
*/
stg_newByteArrayzh
{
W_ words, payload_words, n, p;
MAYBE_GC(NO_PTRS,stg_newByteArrayzh);
n = R1;
payload_words = ROUNDUP_BYTES_TO_WDS(n);
words = BYTES_TO_WDS(SIZEOF_StgArrWords) + payload_words;
("ptr" p) = foreign "C" allocate(MyCapability() "ptr",words) [];
TICK_ALLOC_PRIM(SIZEOF_StgArrWords,WDS(payload_words),0);
SET_HDR(p, stg_ARR_WORDS_info, CCCS);
StgArrWords_bytes(p) = n;
RET_P(p);
}
#define BA_ALIGN 16
#define BA_MASK (BA_ALIGN-1)
stg_newPinnedByteArrayzh
{
W_ words, n, bytes, payload_words, p;
MAYBE_GC(NO_PTRS,stg_newPinnedByteArrayzh);
n = R1;
bytes = n;
/* payload_words is what we will tell the profiler we had to allocate */
payload_words = ROUNDUP_BYTES_TO_WDS(bytes);
/* When we actually allocate memory, we need to allow space for the
header: */
bytes = bytes + SIZEOF_StgArrWords;
/* And we want to align to BA_ALIGN bytes, so we need to allow space
to shift up to BA_ALIGN - 1 bytes: */
bytes = bytes + BA_ALIGN - 1;
/* Now we convert to a number of words: */
words = ROUNDUP_BYTES_TO_WDS(bytes);
("ptr" p) = foreign "C" allocatePinned(MyCapability() "ptr", words) [];
TICK_ALLOC_PRIM(SIZEOF_StgArrWords,WDS(payload_words),0);
/* Now we need to move p forward so that the payload is aligned
to BA_ALIGN bytes: */
p = p + ((-p - SIZEOF_StgArrWords) & BA_MASK);
SET_HDR(p, stg_ARR_WORDS_info, CCCS);
StgArrWords_bytes(p) = n;
RET_P(p);
}
stg_newAlignedPinnedByteArrayzh
{
W_ words, n, bytes, payload_words, p, alignment;
MAYBE_GC(NO_PTRS,stg_newAlignedPinnedByteArrayzh);
n = R1;
alignment = R2;
/* we always supply at least word-aligned memory, so there's no
need to allow extra space for alignment if the requirement is less
than a word. This also prevents mischief with alignment == 0. */
if (alignment <= SIZEOF_W) { alignment = 1; }
bytes = n;
/* payload_words is what we will tell the profiler we had to allocate */
payload_words = ROUNDUP_BYTES_TO_WDS(bytes);
/* When we actually allocate memory, we need to allow space for the
header: */
bytes = bytes + SIZEOF_StgArrWords;
/* And we want to align to <alignment> bytes, so we need to allow space
to shift up to <alignment - 1> bytes: */
bytes = bytes + alignment - 1;
/* Now we convert to a number of words: */
words = ROUNDUP_BYTES_TO_WDS(bytes);
("ptr" p) = foreign "C" allocatePinned(MyCapability() "ptr", words) [];
TICK_ALLOC_PRIM(SIZEOF_StgArrWords,WDS(payload_words),0);
/* Now we need to move p forward so that the payload is aligned
to <alignment> bytes. Note that we are assuming that
<alignment> is a power of 2, which is technically not guaranteed */
p = p + ((-p - SIZEOF_StgArrWords) & (alignment - 1));
SET_HDR(p, stg_ARR_WORDS_info, CCCS);
StgArrWords_bytes(p) = n;
RET_P(p);
}
stg_newArrayzh
{
W_ words, n, init, arr, p, size;
/* Args: R1 = words, R2 = initialisation value */
n = R1;
MAYBE_GC(R2_PTR,stg_newArrayzh);
// the mark area contains one byte for each 2^MUT_ARR_PTRS_CARD_BITS words
// in the array, making sure we round up, and then rounding up to a whole
// number of words.
size = n + mutArrPtrsCardWords(n);
words = BYTES_TO_WDS(SIZEOF_StgMutArrPtrs) + size;
("ptr" arr) = foreign "C" allocate(MyCapability() "ptr",words) [R2];
TICK_ALLOC_PRIM(SIZEOF_StgMutArrPtrs, WDS(n), 0);
SET_HDR(arr, stg_MUT_ARR_PTRS_DIRTY_info, CCCS);
StgMutArrPtrs_ptrs(arr) = n;
StgMutArrPtrs_size(arr) = size;
// Initialise all elements of the the array with the value in R2
init = R2;
p = arr + SIZEOF_StgMutArrPtrs;
for:
if (p < arr + WDS(words)) {
W_[p] = init;
p = p + WDS(1);
goto for;
}
// Initialise the mark bits with 0
for2:
if (p < arr + WDS(size)) {
W_[p] = 0;
p = p + WDS(1);
goto for2;
}
RET_P(arr);
}
stg_unsafeThawArrayzh
{
// SUBTLETY TO DO WITH THE OLD GEN MUTABLE LIST
//
// A MUT_ARR_PTRS lives on the mutable list, but a MUT_ARR_PTRS_FROZEN
// normally doesn't. However, when we freeze a MUT_ARR_PTRS, we leave
// it on the mutable list for the GC to remove (removing something from
// the mutable list is not easy).
//
// So that we can tell whether a MUT_ARR_PTRS_FROZEN is on the mutable list,
// when we freeze it we set the info ptr to be MUT_ARR_PTRS_FROZEN0
// to indicate that it is still on the mutable list.
//
// So, when we thaw a MUT_ARR_PTRS_FROZEN, we must cope with two cases:
// either it is on a mut_list, or it isn't. We adopt the convention that
// the closure type is MUT_ARR_PTRS_FROZEN0 if it is on the mutable list,
// and MUT_ARR_PTRS_FROZEN otherwise. In fact it wouldn't matter if
// we put it on the mutable list more than once, but it would get scavenged
// multiple times during GC, which would be unnecessarily slow.
//
if (StgHeader_info(R1) != stg_MUT_ARR_PTRS_FROZEN0_info) {
SET_INFO(R1,stg_MUT_ARR_PTRS_DIRTY_info);
recordMutable(R1, R1);
// must be done after SET_INFO, because it ASSERTs closure_MUTABLE()
RET_P(R1);
} else {
SET_INFO(R1,stg_MUT_ARR_PTRS_DIRTY_info);
RET_P(R1);
}
}
stg_newArrayArrayzh
{
W_ words, n, arr, p, size;
/* Args: R1 = words */
n = R1;
MAYBE_GC(NO_PTRS,stg_newArrayArrayzh);
// the mark area contains one byte for each 2^MUT_ARR_PTRS_CARD_BITS words
// in the array, making sure we round up, and then rounding up to a whole
// number of words.
size = n + mutArrPtrsCardWords(n);
words = BYTES_TO_WDS(SIZEOF_StgMutArrPtrs) + size;
("ptr" arr) = foreign "C" allocate(MyCapability() "ptr",words) [];
TICK_ALLOC_PRIM(SIZEOF_StgMutArrPtrs, WDS(n), 0);
SET_HDR(arr, stg_MUT_ARR_PTRS_DIRTY_info, W_[CCCS]);
StgMutArrPtrs_ptrs(arr) = n;
StgMutArrPtrs_size(arr) = size;
// Initialise all elements of the array with a pointer to the new array
p = arr + SIZEOF_StgMutArrPtrs;
for:
if (p < arr + WDS(words)) {
W_[p] = arr;
p = p + WDS(1);
goto for;
}
// Initialise the mark bits with 0
for2:
if (p < arr + WDS(size)) {
W_[p] = 0;
p = p + WDS(1);
goto for2;
}
RET_P(arr);
}
/* -----------------------------------------------------------------------------
MutVar primitives
-------------------------------------------------------------------------- */
stg_newMutVarzh
{
W_ mv;
/* Args: R1 = initialisation value */
ALLOC_PRIM( SIZEOF_StgMutVar, R1_PTR, stg_newMutVarzh);
mv = Hp - SIZEOF_StgMutVar + WDS(1);
SET_HDR(mv,stg_MUT_VAR_DIRTY_info,CCCS);
StgMutVar_var(mv) = R1;
RET_P(mv);
}
stg_casMutVarzh
/* MutVar# s a -> a -> a -> State# s -> (# State#, Int#, a #) */
{
W_ mv, old, new, h;
mv = R1;
old = R2;
new = R3;
(h) = foreign "C" cas(mv + SIZEOF_StgHeader + OFFSET_StgMutVar_var,
old, new) [];
if (h != old) {
RET_NP(1,h);
} else {
if (GET_INFO(mv) == stg_MUT_VAR_CLEAN_info) {
foreign "C" dirty_MUT_VAR(BaseReg "ptr", mv "ptr") [];
}
RET_NP(0,h);
}
}
stg_atomicModifyMutVarzh
{
W_ mv, f, z, x, y, r, h;
/* Args: R1 :: MutVar#, R2 :: a -> (a,b) */
/* If x is the current contents of the MutVar#, then
We want to make the new contents point to
(sel_0 (f x))
and the return value is
(sel_1 (f x))
obviously we can share (f x).
z = [stg_ap_2 f x] (max (HS + 2) MIN_UPD_SIZE)
y = [stg_sel_0 z] (max (HS + 1) MIN_UPD_SIZE)
r = [stg_sel_1 z] (max (HS + 1) MIN_UPD_SIZE)
*/
#if MIN_UPD_SIZE > 1
#define THUNK_1_SIZE (SIZEOF_StgThunkHeader + WDS(MIN_UPD_SIZE))
#define TICK_ALLOC_THUNK_1() TICK_ALLOC_UP_THK(WDS(1),WDS(MIN_UPD_SIZE-1))
#else
#define THUNK_1_SIZE (SIZEOF_StgThunkHeader + WDS(1))
#define TICK_ALLOC_THUNK_1() TICK_ALLOC_UP_THK(WDS(1),0)
#endif
#if MIN_UPD_SIZE > 2
#define THUNK_2_SIZE (SIZEOF_StgThunkHeader + WDS(MIN_UPD_SIZE))
#define TICK_ALLOC_THUNK_2() TICK_ALLOC_UP_THK(WDS(2),WDS(MIN_UPD_SIZE-2))
#else
#define THUNK_2_SIZE (SIZEOF_StgThunkHeader + WDS(2))
#define TICK_ALLOC_THUNK_2() TICK_ALLOC_UP_THK(WDS(2),0)
#endif
#define SIZE (THUNK_2_SIZE + THUNK_1_SIZE + THUNK_1_SIZE)
HP_CHK_GEN_TICKY(SIZE, R1_PTR & R2_PTR, stg_atomicModifyMutVarzh);
mv = R1;
f = R2;
TICK_ALLOC_THUNK_2();
CCCS_ALLOC(THUNK_2_SIZE);
z = Hp - THUNK_2_SIZE + WDS(1);
SET_HDR(z, stg_ap_2_upd_info, CCCS);
LDV_RECORD_CREATE(z);
StgThunk_payload(z,0) = f;
TICK_ALLOC_THUNK_1();
CCCS_ALLOC(THUNK_1_SIZE);
y = z - THUNK_1_SIZE;
SET_HDR(y, stg_sel_0_upd_info, CCCS);
LDV_RECORD_CREATE(y);
StgThunk_payload(y,0) = z;
TICK_ALLOC_THUNK_1();
CCCS_ALLOC(THUNK_1_SIZE);
r = y - THUNK_1_SIZE;
SET_HDR(r, stg_sel_1_upd_info, CCCS);
LDV_RECORD_CREATE(r);
StgThunk_payload(r,0) = z;
retry:
x = StgMutVar_var(mv);
StgThunk_payload(z,1) = x;
#ifdef THREADED_RTS
(h) = foreign "C" cas(mv + SIZEOF_StgHeader + OFFSET_StgMutVar_var, x, y) [];
if (h != x) { goto retry; }
#else
StgMutVar_var(mv) = y;
#endif
if (GET_INFO(mv) == stg_MUT_VAR_CLEAN_info) {
foreign "C" dirty_MUT_VAR(BaseReg "ptr", mv "ptr") [];
}
RET_P(r);
}
/* -----------------------------------------------------------------------------
Weak Pointer Primitives
-------------------------------------------------------------------------- */
STRING(stg_weak_msg,"New weak pointer at %p\n")
stg_mkWeakzh
{
/* R1 = key
R2 = value
R3 = finalizer (or NULL)
*/
W_ w;
if (R3 == NULL) {
R3 = stg_NO_FINALIZER_closure;
}
ALLOC_PRIM( SIZEOF_StgWeak, R1_PTR & R2_PTR & R3_PTR, stg_mkWeakzh );
w = Hp - SIZEOF_StgWeak + WDS(1);
SET_HDR(w, stg_WEAK_info, CCCS);
// We don't care about cfinalizer here.
// Should StgWeak_cfinalizer(w) be stg_NO_FINALIZER_closure or
// something else?
StgWeak_key(w) = R1;
StgWeak_value(w) = R2;
StgWeak_finalizer(w) = R3;
StgWeak_cfinalizer(w) = stg_NO_FINALIZER_closure;
ACQUIRE_LOCK(sm_mutex);
StgWeak_link(w) = W_[weak_ptr_list];
W_[weak_ptr_list] = w;
RELEASE_LOCK(sm_mutex);
IF_DEBUG(weak, foreign "C" debugBelch(stg_weak_msg,w) []);
RET_P(w);
}
stg_mkWeakForeignEnvzh
{
/* R1 = key
R2 = value
R3 = finalizer
R4 = pointer
R5 = has environment (0 or 1)
R6 = environment
*/
W_ w, payload_words, words, p;
W_ key, val, fptr, ptr, flag, eptr;
key = R1;
val = R2;
fptr = R3;
ptr = R4;
flag = R5;
eptr = R6;
ALLOC_PRIM( SIZEOF_StgWeak, R1_PTR & R2_PTR, stg_mkWeakForeignEnvzh );
w = Hp - SIZEOF_StgWeak + WDS(1);
SET_HDR(w, stg_WEAK_info, CCCS);
payload_words = 4;
words = BYTES_TO_WDS(SIZEOF_StgArrWords) + payload_words;
("ptr" p) = foreign "C" allocate(MyCapability() "ptr", words) [];
TICK_ALLOC_PRIM(SIZEOF_StgArrWords,WDS(payload_words),0);
SET_HDR(p, stg_ARR_WORDS_info, CCCS);
StgArrWords_bytes(p) = WDS(payload_words);
StgArrWords_payload(p,0) = fptr;
StgArrWords_payload(p,1) = ptr;
StgArrWords_payload(p,2) = eptr;
StgArrWords_payload(p,3) = flag;
// We don't care about the value here.
// Should StgWeak_value(w) be stg_NO_FINALIZER_closure or something else?
StgWeak_key(w) = key;
StgWeak_value(w) = val;
StgWeak_finalizer(w) = stg_NO_FINALIZER_closure;
StgWeak_cfinalizer(w) = p;
ACQUIRE_LOCK(sm_mutex);
StgWeak_link(w) = W_[weak_ptr_list];
W_[weak_ptr_list] = w;
RELEASE_LOCK(sm_mutex);
IF_DEBUG(weak, foreign "C" debugBelch(stg_weak_msg,w) []);
RET_P(w);
}
stg_finalizzeWeakzh
{
/* R1 = weak ptr
*/
W_ w, f, arr;
w = R1;
// already dead?
if (GET_INFO(w) == stg_DEAD_WEAK_info) {
RET_NP(0,stg_NO_FINALIZER_closure);
}
// kill it
#ifdef PROFILING
// @LDV profiling
// A weak pointer is inherently used, so we do not need to call
// LDV_recordDead_FILL_SLOP_DYNAMIC():
// LDV_recordDead_FILL_SLOP_DYNAMIC((StgClosure *)w);
// or, LDV_recordDead():
// LDV_recordDead((StgClosure *)w, sizeofW(StgWeak) - sizeofW(StgProfHeader));
// Furthermore, when PROFILING is turned on, dead weak pointers are exactly as
// large as weak pointers, so there is no need to fill the slop, either.
// See stg_DEAD_WEAK_info in StgMiscClosures.hc.
#endif
//
// Todo: maybe use SET_HDR() and remove LDV_recordCreate()?
//
SET_INFO(w,stg_DEAD_WEAK_info);
LDV_RECORD_CREATE(w);
f = StgWeak_finalizer(w);
arr = StgWeak_cfinalizer(w);
StgDeadWeak_link(w) = StgWeak_link(w);
if (arr != stg_NO_FINALIZER_closure) {
foreign "C" runCFinalizer(StgArrWords_payload(arr,0),
StgArrWords_payload(arr,1),
StgArrWords_payload(arr,2),
StgArrWords_payload(arr,3)) [];
}
/* return the finalizer */
if (f == stg_NO_FINALIZER_closure) {
RET_NP(0,stg_NO_FINALIZER_closure);
} else {
RET_NP(1,f);
}
}
stg_deRefWeakzh
{
/* R1 = weak ptr */
W_ w, code, val;
w = R1;
if (GET_INFO(w) == stg_WEAK_info) {
code = 1;
val = StgWeak_value(w);
} else {
code = 0;
val = w;
}
RET_NP(code,val);
}
/* -----------------------------------------------------------------------------
Floating point operations.
-------------------------------------------------------------------------- */
stg_decodeFloatzuIntzh
{
W_ p;
F_ arg;
W_ mp_tmp1;
W_ mp_tmp_w;
STK_CHK_GEN( WDS(2), NO_PTRS, stg_decodeFloatzuIntzh );
mp_tmp1 = Sp - WDS(1);
mp_tmp_w = Sp - WDS(2);
/* arguments: F1 = Float# */
arg = F1;
/* Perform the operation */
foreign "C" __decodeFloat_Int(mp_tmp1 "ptr", mp_tmp_w "ptr", arg) [];
/* returns: (Int# (mantissa), Int# (exponent)) */
RET_NN(W_[mp_tmp1], W_[mp_tmp_w]);
}
stg_decodeDoublezu2Intzh
{
D_ arg;
W_ p;
W_ mp_tmp1;
W_ mp_tmp2;
W_ mp_result1;
W_ mp_result2;
STK_CHK_GEN( WDS(4), NO_PTRS, stg_decodeDoublezu2Intzh );
mp_tmp1 = Sp - WDS(1);
mp_tmp2 = Sp - WDS(2);
mp_result1 = Sp - WDS(3);
mp_result2 = Sp - WDS(4);
/* arguments: D1 = Double# */
arg = D1;
/* Perform the operation */
foreign "C" __decodeDouble_2Int(mp_tmp1 "ptr", mp_tmp2 "ptr",
mp_result1 "ptr", mp_result2 "ptr",
arg) [];
/* returns:
(Int# (mant sign), Word# (mant high), Word# (mant low), Int# (expn)) */
RET_NNNN(W_[mp_tmp1], W_[mp_tmp2], W_[mp_result1], W_[mp_result2]);
}
/* -----------------------------------------------------------------------------
* Concurrency primitives
* -------------------------------------------------------------------------- */
stg_forkzh
{
/* args: R1 = closure to spark */
MAYBE_GC(R1_PTR, stg_forkzh);
W_ closure;
W_ threadid;
closure = R1;
("ptr" threadid) = foreign "C" createIOThread( MyCapability() "ptr",
RtsFlags_GcFlags_initialStkSize(RtsFlags),
closure "ptr") [];
/* start blocked if the current thread is blocked */
StgTSO_flags(threadid) = %lobits16(
TO_W_(StgTSO_flags(threadid)) |
TO_W_(StgTSO_flags(CurrentTSO)) & (TSO_BLOCKEX | TSO_INTERRUPTIBLE));
foreign "C" scheduleThread(MyCapability() "ptr", threadid "ptr") [];
// context switch soon, but not immediately: we don't want every
// forkIO to force a context-switch.
Capability_context_switch(MyCapability()) = 1 :: CInt;
RET_P(threadid);
}
stg_forkOnzh
{
/* args: R1 = cpu, R2 = closure to spark */
MAYBE_GC(R2_PTR, stg_forkOnzh);
W_ cpu;
W_ closure;
W_ threadid;
cpu = R1;
closure = R2;
("ptr" threadid) = foreign "C" createIOThread( MyCapability() "ptr",
RtsFlags_GcFlags_initialStkSize(RtsFlags),
closure "ptr") [];
/* start blocked if the current thread is blocked */
StgTSO_flags(threadid) = %lobits16(
TO_W_(StgTSO_flags(threadid)) |
TO_W_(StgTSO_flags(CurrentTSO)) & (TSO_BLOCKEX | TSO_INTERRUPTIBLE));
foreign "C" scheduleThreadOn(MyCapability() "ptr", cpu, threadid "ptr") [];
// context switch soon, but not immediately: we don't want every
// forkIO to force a context-switch.
Capability_context_switch(MyCapability()) = 1 :: CInt;
RET_P(threadid);
}
stg_yieldzh
{
jump stg_yield_noregs;
}
stg_myThreadIdzh
{
/* no args. */
RET_P(CurrentTSO);
}
stg_labelThreadzh
{
/* args:
R1 = ThreadId#
R2 = Addr# */
#if defined(DEBUG) || defined(TRACING) || defined(DTRACE)
foreign "C" labelThread(MyCapability() "ptr", R1 "ptr", R2 "ptr") [];
#endif
jump %ENTRY_CODE(Sp(0));
}
stg_isCurrentThreadBoundzh
{
/* no args */
W_ r;
(r) = foreign "C" isThreadBound(CurrentTSO) [];
RET_N(r);
}
stg_threadStatuszh
{
/* args: R1 :: ThreadId# */
W_ tso;
W_ why_blocked;
W_ what_next;
W_ ret, cap, locked;
tso = R1;
what_next = TO_W_(StgTSO_what_next(tso));
why_blocked = TO_W_(StgTSO_why_blocked(tso));
// Note: these two reads are not atomic, so they might end up
// being inconsistent. It doesn't matter, since we
// only return one or the other. If we wanted to return the
// contents of block_info too, then we'd have to do some synchronisation.
if (what_next == ThreadComplete) {
ret = 16; // NB. magic, matches up with GHC.Conc.threadStatus
} else {
if (what_next == ThreadKilled) {
ret = 17;
} else {
ret = why_blocked;
}
}
cap = TO_W_(Capability_no(StgTSO_cap(tso)));
if ((TO_W_(StgTSO_flags(tso)) & TSO_LOCKED) != 0) {
locked = 1;
} else {
locked = 0;
}
RET_NNN(ret,cap,locked);
}
/* -----------------------------------------------------------------------------
* TVar primitives
* -------------------------------------------------------------------------- */
#define SP_OFF 0
// Catch retry frame ------------------------------------------------------------
INFO_TABLE_RET(stg_catch_retry_frame, CATCH_RETRY_FRAME,
#if defined(PROFILING)
W_ unused1, W_ unused2,
#endif
W_ unused3, P_ unused4, P_ unused5)
{
W_ r, frame, trec, outer;
frame = Sp;
trec = StgTSO_trec(CurrentTSO);
outer = StgTRecHeader_enclosing_trec(trec);
(r) = foreign "C" stmCommitNestedTransaction(MyCapability() "ptr", trec "ptr") [];
if (r != 0) {
/* Succeeded (either first branch or second branch) */
StgTSO_trec(CurrentTSO) = outer;
Sp = Sp + SIZEOF_StgCatchRetryFrame;
jump %ENTRY_CODE(Sp(SP_OFF));
} else {
/* Did not commit: re-execute */
W_ new_trec;
("ptr" new_trec) = foreign "C" stmStartTransaction(MyCapability() "ptr", outer "ptr") [];
StgTSO_trec(CurrentTSO) = new_trec;
if (StgCatchRetryFrame_running_alt_code(frame) != 0::I32) {
R1 = StgCatchRetryFrame_alt_code(frame);
} else {
R1 = StgCatchRetryFrame_first_code(frame);
}
jump stg_ap_v_fast;
}
}
// Atomically frame ------------------------------------------------------------
INFO_TABLE_RET(stg_atomically_frame, ATOMICALLY_FRAME,
#if defined(PROFILING)
W_ unused1, W_ unused2,
#endif
P_ code, P_ next_invariant_to_check, P_ result)
{
W_ frame, trec, valid, next_invariant, q, outer;
frame = Sp;
trec = StgTSO_trec(CurrentTSO);
result = R1;
outer = StgTRecHeader_enclosing_trec(trec);
if (outer == NO_TREC) {
/* First time back at the atomically frame -- pick up invariants */
("ptr" q) = foreign "C" stmGetInvariantsToCheck(MyCapability() "ptr", trec "ptr") [];
StgAtomicallyFrame_next_invariant_to_check(frame) = q;
StgAtomicallyFrame_result(frame) = result;
} else {
/* Second/subsequent time back at the atomically frame -- abort the
* tx that's checking the invariant and move on to the next one */
StgTSO_trec(CurrentTSO) = outer;
q = StgAtomicallyFrame_next_invariant_to_check(frame);
StgInvariantCheckQueue_my_execution(q) = trec;
foreign "C" stmAbortTransaction(MyCapability() "ptr", trec "ptr") [];
/* Don't free trec -- it's linked from q and will be stashed in the
* invariant if we eventually commit. */
q = StgInvariantCheckQueue_next_queue_entry(q);
StgAtomicallyFrame_next_invariant_to_check(frame) = q;
trec = outer;
}
q = StgAtomicallyFrame_next_invariant_to_check(frame);
if (q != END_INVARIANT_CHECK_QUEUE) {
/* We can't commit yet: another invariant to check */
("ptr" trec) = foreign "C" stmStartTransaction(MyCapability() "ptr", trec "ptr") [];
StgTSO_trec(CurrentTSO) = trec;
next_invariant = StgInvariantCheckQueue_invariant(q);
R1 = StgAtomicInvariant_code(next_invariant);
jump stg_ap_v_fast;
} else {
/* We've got no more invariants to check, try to commit */
(valid) = foreign "C" stmCommitTransaction(MyCapability() "ptr", trec "ptr") [];
if (valid != 0) {
/* Transaction was valid: commit succeeded */
StgTSO_trec(CurrentTSO) = NO_TREC;
R1 = StgAtomicallyFrame_result(frame);
Sp = Sp + SIZEOF_StgAtomicallyFrame;
jump %ENTRY_CODE(Sp(SP_OFF));
} else {
/* Transaction was not valid: try again */
("ptr" trec) = foreign "C" stmStartTransaction(MyCapability() "ptr", NO_TREC "ptr") [];
StgTSO_trec(CurrentTSO) = trec;
StgAtomicallyFrame_next_invariant_to_check(frame) = END_INVARIANT_CHECK_QUEUE;
R1 = StgAtomicallyFrame_code(frame);
jump stg_ap_v_fast;
}
}
}
INFO_TABLE_RET(stg_atomically_waiting_frame, ATOMICALLY_FRAME,
#if defined(PROFILING)
W_ unused1, W_ unused2,
#endif
P_ code, P_ next_invariant_to_check, P_ result)
{
W_ frame, trec, valid;
frame = Sp;
/* The TSO is currently waiting: should we stop waiting? */
(valid) = foreign "C" stmReWait(MyCapability() "ptr", CurrentTSO "ptr") [];
if (valid != 0) {
/* Previous attempt is still valid: no point trying again yet */
jump stg_block_noregs;
} else {
/* Previous attempt is no longer valid: try again */
("ptr" trec) = foreign "C" stmStartTransaction(MyCapability() "ptr", NO_TREC "ptr") [];
StgTSO_trec(CurrentTSO) = trec;
StgHeader_info(frame) = stg_atomically_frame_info;
R1 = StgAtomicallyFrame_code(frame);
jump stg_ap_v_fast;
}
}
// STM catch frame --------------------------------------------------------------
#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.
*/
INFO_TABLE_RET(stg_catch_stm_frame, CATCH_STM_FRAME,
#if defined(PROFILING)
W_ unused1, W_ unused2,
#endif
P_ unused3, P_ unused4)
{
W_ r, frame, trec, outer;
frame = Sp;
trec = StgTSO_trec(CurrentTSO);
outer = StgTRecHeader_enclosing_trec(trec);
(r) = foreign "C" stmCommitNestedTransaction(MyCapability() "ptr", trec "ptr") [];
if (r != 0) {
/* Commit succeeded */
StgTSO_trec(CurrentTSO) = outer;
Sp = Sp + SIZEOF_StgCatchSTMFrame;
jump %ENTRY_CODE(Sp(SP_OFF));
} else {
/* Commit failed */
W_ new_trec;
("ptr" new_trec) = foreign "C" stmStartTransaction(MyCapability() "ptr", outer "ptr") [];
StgTSO_trec(CurrentTSO) = new_trec;
R1 = StgCatchSTMFrame_code(frame);
jump stg_ap_v_fast;
}
}
// Primop definition ------------------------------------------------------------
stg_atomicallyzh
{
W_ frame;
W_ old_trec;
W_ new_trec;
// stmStartTransaction may allocate
MAYBE_GC (R1_PTR, stg_atomicallyzh);
/* Args: R1 = m :: STM a */
STK_CHK_GEN(SIZEOF_StgAtomicallyFrame + WDS(1), R1_PTR, stg_atomicallyzh);
old_trec = StgTSO_trec(CurrentTSO);
/* Nested transactions are not allowed; raise an exception */
if (old_trec != NO_TREC) {
R1 = base_ControlziExceptionziBase_nestedAtomically_closure;
jump stg_raisezh;
}
/* Set up the atomically frame */
Sp = Sp - SIZEOF_StgAtomicallyFrame;
frame = Sp;
SET_HDR(frame,stg_atomically_frame_info, CCCS);
StgAtomicallyFrame_code(frame) = R1;
StgAtomicallyFrame_result(frame) = NO_TREC;
StgAtomicallyFrame_next_invariant_to_check(frame) = END_INVARIANT_CHECK_QUEUE;
/* Start the memory transcation */
("ptr" new_trec) = foreign "C" stmStartTransaction(MyCapability() "ptr", old_trec "ptr") [R1];
StgTSO_trec(CurrentTSO) = new_trec;
/* Apply R1 to the realworld token */
jump stg_ap_v_fast;
}
// A closure representing "atomically x". This is used when a thread
// inside a transaction receives an asynchronous exception; see #5866.
// It is somewhat similar to the stg_raise closure.
//
INFO_TABLE(stg_atomically,1,0,THUNK_1_0,"atomically","atomically")
{
R1 = StgThunk_payload(R1,0);
jump stg_atomicallyzh;
}
stg_catchSTMzh
{
W_ frame;
/* Args: R1 :: STM a */
/* Args: R2 :: Exception -> STM a */
STK_CHK_GEN(SIZEOF_StgCatchSTMFrame + WDS(1), R1_PTR & R2_PTR, stg_catchSTMzh);
/* Set up the catch frame */
Sp = Sp - SIZEOF_StgCatchSTMFrame;
frame = Sp;
SET_HDR(frame, stg_catch_stm_frame_info, CCCS);
StgCatchSTMFrame_handler(frame) = R2;
StgCatchSTMFrame_code(frame) = R1;
/* Start a nested transaction to run the body of the try block in */
W_ cur_trec;
W_ new_trec;
cur_trec = StgTSO_trec(CurrentTSO);
("ptr" new_trec) = foreign "C" stmStartTransaction(MyCapability() "ptr", cur_trec "ptr");
StgTSO_trec(CurrentTSO) = new_trec;
/* Apply R1 to the realworld token */
jump stg_ap_v_fast;
}
stg_catchRetryzh
{
W_ frame;
W_ new_trec;
W_ trec;
// stmStartTransaction may allocate
MAYBE_GC (R1_PTR & R2_PTR, stg_catchRetryzh);
/* Args: R1 :: STM a */
/* Args: R2 :: STM a */
STK_CHK_GEN(SIZEOF_StgCatchRetryFrame + WDS(1), R1_PTR & R2_PTR, stg_catchRetryzh);
/* Start a nested transaction within which to run the first code */
trec = StgTSO_trec(CurrentTSO);
("ptr" new_trec) = foreign "C" stmStartTransaction(MyCapability() "ptr", trec "ptr") [R1,R2];
StgTSO_trec(CurrentTSO) = new_trec;
/* Set up the catch-retry frame */
Sp = Sp - SIZEOF_StgCatchRetryFrame;
frame = Sp;
SET_HDR(frame, stg_catch_retry_frame_info, CCCS);
StgCatchRetryFrame_running_alt_code(frame) = 0 :: CInt; // false;
StgCatchRetryFrame_first_code(frame) = R1;
StgCatchRetryFrame_alt_code(frame) = R2;