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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "prlog.h"
#include "prthread.h"
#include "private/pprthred.h"
#include "primpl.h"
PR_IMPLEMENT(PRWord *)
PR_GetGCRegisters(PRThread *t, int isCurrent, int *np)
{
return _MD_HomeGCRegisters(t, isCurrent, np);
}
PR_IMPLEMENT(PRStatus)
PR_ThreadScanStackPointers(PRThread* t,
PRScanStackFun scanFun, void* scanClosure)
{
PRThread* current = PR_GetCurrentThread();
PRWord *sp, *esp, *p0;
int n;
void **ptd;
PRStatus status;
PRUint32 index;
int stack_end;
/*
** Store the thread's registers in the thread structure so the GC
** can scan them. Then scan them.
*/
p0 = _MD_HomeGCRegisters(t, t == current, &n);
status = scanFun(t, (void**)p0, n, scanClosure);
if (status != PR_SUCCESS) {
return status;
}
/* Scan the C stack for pointers into the GC heap */
#if defined(XP_PC) && defined(WIN16)
/*
** Under WIN16, the stack of the current thread is always mapped into
** the "task stack" (at SS:xxxx). So, if t is the current thread, scan
** the "task stack". Otherwise, scan the "cached stack" of the inactive
** thread...
*/
if (t == current) {
sp = (PRWord*) &stack_end;
esp = (PRWord*) _pr_top_of_task_stack;
PR_ASSERT(sp <= esp);
} else {
sp = (PRWord*) PR_GetSP(t);
esp = (PRWord*) t->stack->stackTop;
PR_ASSERT((t->stack->stackSize == 0) ||
((sp > (PRWord*)t->stack->stackBottom) &&
(sp <= (PRWord*)t->stack->stackTop)));
}
#else /* ! WIN16 */
#ifdef HAVE_STACK_GROWING_UP
if (t == current) {
esp = (PRWord*) &stack_end;
} else {
esp = (PRWord*) PR_GetSP(t);
}
sp = (PRWord*) t->stack->stackTop;
if (t->stack->stackSize) {
PR_ASSERT((esp > (PRWord*)t->stack->stackTop) &&
(esp < (PRWord*)t->stack->stackBottom));
}
#else /* ! HAVE_STACK_GROWING_UP */
if (t == current) {
sp = (PRWord*) &stack_end;
} else {
sp = (PRWord*) PR_GetSP(t);
}
esp = (PRWord*) t->stack->stackTop;
if (t->stack->stackSize) {
PR_ASSERT((sp > (PRWord*)t->stack->stackBottom) &&
(sp < (PRWord*)t->stack->stackTop));
}
#endif /* ! HAVE_STACK_GROWING_UP */
#endif /* ! WIN16 */
#if defined(WIN16)
{
prword_t scan;
prword_t limit;
scan = (prword_t) sp;
limit = (prword_t) esp;
while (scan < limit) {
prword_t *test;
test = *((prword_t **)scan);
status = scanFun(t, (void**)&test, 1, scanClosure);
if (status != PR_SUCCESS) {
return status;
}
scan += sizeof(char);
}
}
#else
if (sp < esp) {
status = scanFun(t, (void**)sp, esp - sp, scanClosure);
if (status != PR_SUCCESS) {
return status;
}
}
#endif
/*
** Mark all of the per-thread-data items attached to this thread
**
** The execution environment better be accounted for otherwise it
** will be collected
*/
status = scanFun(t, (void**)&t->environment, 1, scanClosure);
if (status != PR_SUCCESS) {
return status;
}
/* if thread is not allocated on stack, this is redundant. */
ptd = t->privateData;
for (index = 0; index < t->tpdLength; index++, ptd++) {
status = scanFun(t, (void**)ptd, 1, scanClosure);
if (status != PR_SUCCESS) {
return status;
}
}
return PR_SUCCESS;
}
/* transducer for PR_EnumerateThreads */
typedef struct PRScanStackData {
PRScanStackFun scanFun;
void* scanClosure;
} PRScanStackData;
static PRStatus PR_CALLBACK
pr_ScanStack(PRThread* t, int i, void* arg)
{
PRScanStackData* data = (PRScanStackData*)arg;
return PR_ThreadScanStackPointers(t, data->scanFun, data->scanClosure);
}
PR_IMPLEMENT(PRStatus)
PR_ScanStackPointers(PRScanStackFun scanFun, void* scanClosure)
{
PRScanStackData data;
data.scanFun = scanFun;
data.scanClosure = scanClosure;
return PR_EnumerateThreads(pr_ScanStack, &data);
}
PR_IMPLEMENT(PRUword)
PR_GetStackSpaceLeft(PRThread* t)
{
PRThread *current = PR_GetCurrentThread();
PRWord *sp, *esp;
int stack_end;
#if defined(WIN16)
/*
** Under WIN16, the stack of the current thread is always mapped into
** the "task stack" (at SS:xxxx). So, if t is the current thread, scan
** the "task stack". Otherwise, scan the "cached stack" of the inactive
** thread...
*/
if (t == current) {
sp = (PRWord*) &stack_end;
esp = (PRWord*) _pr_top_of_task_stack;
PR_ASSERT(sp <= esp);
} else {
sp = (PRWord*) PR_GetSP(t);
esp = (PRWord*) t->stack->stackTop;
PR_ASSERT((t->stack->stackSize == 0) ||
((sp > (PRWord*)t->stack->stackBottom) &&
(sp <= (PRWord*)t->stack->stackTop)));
}
#else /* ! WIN16 */
#ifdef HAVE_STACK_GROWING_UP
if (t == current) {
esp = (PRWord*) &stack_end;
} else {
esp = (PRWord*) PR_GetSP(t);
}
sp = (PRWord*) t->stack->stackTop;
if (t->stack->stackSize) {
PR_ASSERT((esp > (PRWord*)t->stack->stackTop) &&
(esp < (PRWord*)t->stack->stackBottom));
}
#else /* ! HAVE_STACK_GROWING_UP */
if (t == current) {
sp = (PRWord*) &stack_end;
} else {
sp = (PRWord*) PR_GetSP(t);
}
esp = (PRWord*) t->stack->stackTop;
if (t->stack->stackSize) {
PR_ASSERT((sp > (PRWord*)t->stack->stackBottom) &&
(sp < (PRWord*)t->stack->stackTop));
}
#endif /* ! HAVE_STACK_GROWING_UP */
#endif /* ! WIN16 */
return (PRUword)t->stack->stackSize - ((PRWord)esp - (PRWord)sp);
}
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