void
__rethrow(void *index)
{
struct eh_context *eh = (*get_eh_context) ();
void *pc, *handler;
long offset;
frame_state my_ustruct, *my_udata = &my_ustruct;
if (! eh->info) {
__terminate ();
}
eh->table_index = index;
label:
my_udata = __frame_state_for (&&label, my_udata);
if (! my_udata) {
__terminate ();
}
my_udata->cfa = __builtin_dwarf_cfa ();
__builtin_unwind_init ();
pc = __builtin_extract_return_addr (__builtin_return_address (0)) - 1;
handler = throw_helper (eh, pc, my_udata, &offset);
__builtin_eh_return ((void *)eh, offset, handler);
}
static void
runtime_mcall(void (*pfn)(G*))
{
#ifndef USING_SPLIT_STACK
int i;
#endif
// Ensure that all registers are on the stack for the garbage
// collector.
__builtin_unwind_init();
if(g == m->g0)
runtime_throw("runtime: mcall called on m->g0 stack");
if(g != nil) {
#ifdef USING_SPLIT_STACK
__splitstack_getcontext(&g->stack_context[0]);
#else
g->gcnext_sp = &i;
#endif
g->fromgogo = false;
getcontext(&g->context);
}
if (g == nil || !g->fromgogo) {
#ifdef USING_SPLIT_STACK
__splitstack_setcontext(&m->g0->stack_context[0]);
#endif
m->g0->entry = (byte*)pfn;
m->g0->param = g;
g = m->g0;
setcontext(&m->g0->context);
runtime_throw("runtime: mcall function returned");
}
}
/* ctxt is either a pointer to a ucontext_t we generated, or NULL. */
void GC_with_callee_saves_pushed(void (*fn)(ptr_t, void *),
ptr_t arg)
{
word dummy;
void * context = 0;
# if defined(HAVE_PUSH_REGS)
GC_push_regs();
# elif defined(UNIX_LIKE) && !defined(DARWIN) && !defined(ARM32)
/* Older versions of Darwin seem to lack getcontext(). */
/* ARM Linux often doesn't support a real getcontext(). */
ucontext_t ctxt;
if (getcontext(&ctxt) < 0)
ABORT ("Getcontext failed: Use another register retrieval method?");
context = &ctxt;
# if defined(SPARC) || defined(IA64)
/* On a register window machine, we need to save register */
/* contents on the stack for this to work. This may already be */
/* subsumed by the getcontext() call. */
{
GC_save_regs_ret_val = GC_save_regs_in_stack();
}
# endif /* register windows. */
# elif defined(HAVE_BUILTIN_UNWIND_INIT)
/* This was suggested by Richard Henderson as the way to */
/* force callee-save registers and register windows onto */
/* the stack. */
__builtin_unwind_init();
# else /* !HAVE_BUILTIN_UNWIND_INIT && !UNIX_LIKE */
/* && !HAVE_PUSH_REGS */
/* Generic code */
/* The idea is due to Parag Patel at HP. */
/* We're not sure whether he would like */
/* to be he acknowledged for it or not. */
jmp_buf regs;
register word * i = (word *) regs;
register ptr_t lim = (ptr_t)(regs) + (sizeof regs);
/* Setjmp doesn't always clear all of the buffer. */
/* That tends to preserve garbage. Clear it. */
for (; (char *)i < lim; i++) {
*i = 0;
}
# if defined(MSWIN32) || defined(MSWINCE) \
|| defined(UTS4) || defined(LINUX) || defined(EWS4800)
(void) setjmp(regs);
# else
(void) _setjmp(regs);
/* We don't want to mess with signals. According to */
/* SUSV3, setjmp() may or may not save signal mask. */
/* _setjmp won't, but is less portable. */
# endif
# endif /* !HAVE_PUSH_REGS ... */
fn(arg, context);
/* Strongly discourage the compiler from treating the above */
/* as a tail-call, since that would pop the register */
/* contents before we get a chance to look at them. */
GC_noop1((word)(&dummy));
}
static void
runtime_mcall(void (*pfn)(G*))
{
M *mp;
G *gp;
#ifndef USING_SPLIT_STACK
int i;
#endif
// Ensure that all registers are on the stack for the garbage
// collector.
__builtin_unwind_init();
mp = m;
gp = g;
if(gp == mp->g0)
runtime_throw("runtime: mcall called on m->g0 stack");
if(gp != nil) {
#ifdef USING_SPLIT_STACK
__splitstack_getcontext(&g->stack_context[0]);
#else
gp->gcnext_sp = &i;
#endif
gp->fromgogo = false;
getcontext(&gp->context);
// When we return from getcontext, we may be running
// in a new thread. That means that m and g may have
// changed. They are global variables so we will
// reload them, but the addresses of m and g may be
// cached in our local stack frame, and those
// addresses may be wrong. Call functions to reload
// the values for this thread.
mp = runtime_m();
gp = runtime_g();
if(gp->traceback != nil)
gtraceback(gp);
}
if (gp == nil || !gp->fromgogo) {
#ifdef USING_SPLIT_STACK
__splitstack_setcontext(&mp->g0->stack_context[0]);
#endif
mp->g0->entry = (byte*)pfn;
mp->g0->param = gp;
// It's OK to set g directly here because this case
// can not occur if we got here via a setcontext to
// the getcontext call just above.
g = mp->g0;
fixcontext(&mp->g0->context);
setcontext(&mp->g0->context);
runtime_throw("runtime: mcall function returned");
}
}
void VMPI_callWithRegistersSaved(void (*fn)(void* stackPointer, void* arg), void* arg)
{
#if defined MMGC_IA32
void* buf = NULL;
__builtin_unwind_init(); // Save registers - GCC intrinsic. Not reliable on 10.4 PPC or 64-bit
#else
jmp_buf buf;
VMPI_setjmpNoUnwind(buf); // Save registers - not always reliable
#endif
CallWithRegistersSaved2(fn, arg, &buf); // Computes the stack pointer, calls fn
CallWithRegistersSaved3(fn, &arg, &buf); // Probably prevents the previous call from being a tail call
}
NOCOMPRESSION void
foo (int x)
{
__builtin_unwind_init ();
__builtin_eh_return (x, bar);
}
void VMPI_callWithRegistersSaved(void (*fn)(void* stackPointer, void* arg), void* arg)
{
__builtin_unwind_init(); // Save registers - GCC intrinsic
CallWithRegistersSaved2(fn, arg, NULL); // Computes the stack pointer, calls fn
CallWithRegistersSaved3(fn, &arg, NULL); // Probably prevents the previous call from being a tail call
}
void foo(void)
{
__builtin_unwind_init ();
setup_offset();
__builtin_eh_return (offset, handler);
}