Robert Hensing
57409244ec
Fixes the problem where a stack pointer outside the original thread causes the collector to crash. It could be made more accurate by recording the stack pointer every time we switch to a coroutine. We can use this information to update our own coroutine stacks like normal data. When the stack pointer is on a thread, we can add a field to GC_thread "fallback_sp" to be used when the thread sp is outside the original thread range.
45 lines
1.9 KiB
Diff
45 lines
1.9 KiB
Diff
diff --git a/pthread_stop_world.c b/pthread_stop_world.c
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index 1cee6a0b..8977b0dd 100644
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--- a/pthread_stop_world.c
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+++ b/pthread_stop_world.c
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@@ -674,6 +674,8 @@ GC_INNER void GC_push_all_stacks(void)
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struct GC_traced_stack_sect_s *traced_stack_sect;
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pthread_t self = pthread_self();
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word total_size = 0;
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+ size_t stack_limit;
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+ pthread_attr_t pattr;
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if (!EXPECT(GC_thr_initialized, TRUE))
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GC_thr_init();
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@@ -723,6 +725,30 @@ GC_INNER void GC_push_all_stacks(void)
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hi = p->altstack + p->altstack_size;
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/* FIXME: Need to scan the normal stack too, but how ? */
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/* FIXME: Assume stack grows down */
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+ } else {
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+ if (pthread_getattr_np(p->id, &pattr)) {
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+ ABORT("GC_push_all_stacks: pthread_getattr_np failed!");
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+ }
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+ if (pthread_attr_getstacksize(&pattr, &stack_limit)) {
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+ ABORT("GC_push_all_stacks: pthread_attr_getstacksize failed!");
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+ }
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+ // When a thread goes into a coroutine, we lose its original sp until
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+ // control flow returns to the thread.
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+ // While in the coroutine, the sp points outside the thread stack,
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+ // so we can detect this and push the entire thread stack instead,
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+ // as an approximation.
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+ // We assume that the coroutine has similarly added its entire stack.
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+ // This could be made accurate by cooperating with the application
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+ // via new functions and/or callbacks.
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+ #ifndef STACK_GROWS_UP
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+ if (lo >= hi || lo < hi - stack_limit) { // sp outside stack
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+ lo = hi - stack_limit;
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+ }
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+ #else
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+ if (lo < hi || lo >= hi + stack_limit) { // sp outside stack
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+ lo = hi + stack_limit;
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+ }
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+ #endif
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}
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GC_push_all_stack_sections(lo, hi, traced_stack_sect);
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# ifdef STACK_GROWS_UP
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