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Experimental support for heap traversal #82

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Experimental support for heap traversal #82

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4 changes: 4 additions & 0 deletions internal/mmtk.h
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Original file line number Diff line number Diff line change
Expand Up @@ -253,4 +253,8 @@ bool mmtk_is_object_wb_unprotected(MMTk_ObjectReference object);

void mmtk_object_reference_write_post(MMTk_Mutator *mutator, MMTk_ObjectReference object);

void mmtk_print_all_objects(void);

void mmtk_enumerate_objects(void (*callback)(MMTk_ObjectReference, void*), void *data);

#endif /* MMTK_H */
1 change: 1 addition & 0 deletions internal/mmtk_support.h
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Expand Up @@ -114,6 +114,7 @@ VALUE rb_mmtk_plan_name(VALUE _);
VALUE rb_mmtk_enabled(VALUE _);
VALUE rb_mmtk_harness_begin(VALUE _);
VALUE rb_mmtk_harness_end(VALUE _);
VALUE rb_mmtk_print_all_objects(VALUE _);

// Debugging
bool rb_mmtk_is_mmtk_worker(void);
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25 changes: 25 additions & 0 deletions iseq.c
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Expand Up @@ -45,6 +45,9 @@
#include "insns.inc"
#include "insns_info.inc"

// MMTk conditional compilation macros
#include "internal/mmtk_macros.h"

VALUE rb_cISeq;
static VALUE iseqw_new(const rb_iseq_t *iseq);
static const rb_iseq_t *iseqw_check(VALUE iseqw);
Expand Down Expand Up @@ -3989,6 +3992,23 @@ rb_clear_bf_ccs(void)
rb_objspace_each_objects(clear_bf_ccs_i, NULL);
}

#if USE_MMTK
static void
rb_mmtk_trace_set_i(MMTk_ObjectReference objref, void *data)
{
rb_event_flag_t turnon_events = *(rb_event_flag_t *)data;
VALUE v = (VALUE) objref;

if (rb_obj_is_iseq(v)) {
rb_iseq_trace_set(rb_iseq_check((rb_iseq_t *)v), turnon_events);
}
else if (clear_attr_cc(v)) {
}
else if (clear_bf_cc(v)) {
}
}
#endif

static int
trace_set_i(void *vstart, void *vend, size_t stride, void *data)
{
Expand All @@ -4015,6 +4035,11 @@ trace_set_i(void *vstart, void *vend, size_t stride, void *data)
void
rb_iseq_trace_set_all(rb_event_flag_t turnon_events)
{
WHEN_USING_MMTK({
mmtk_enumerate_objects(rb_mmtk_trace_set_i, &turnon_events);
return;
});

rb_objspace_each_objects(trace_set_i, &turnon_events);
}

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14 changes: 14 additions & 0 deletions mmtk_support.c
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Expand Up @@ -1188,6 +1188,7 @@ rb_mmtk_define_gc_mmtk_module(void)
rb_define_singleton_method(rb_mMMTk, "enabled?", rb_mmtk_enabled, 0);
rb_define_singleton_method(rb_mMMTk, "harness_begin", rb_mmtk_harness_begin, 0);
rb_define_singleton_method(rb_mMMTk, "harness_end", rb_mmtk_harness_end, 0);
rb_define_singleton_method(rb_mMMTk, "print_all_objects", rb_mmtk_print_all_objects, 0);
}

/*
Expand Down Expand Up @@ -1303,6 +1304,19 @@ rb_mmtk_harness_end(VALUE _)
return Qnil;
}

/*
* call-seq:
* GC::MMTk.print_all_objects
*
* Traverse the heap and print the addresses of all objects.
*/
VALUE
rb_mmtk_print_all_objects(VALUE _)
{
mmtk_print_all_objects();
return Qnil;
}

////////////////////////////////////////////////////////////////////////////////
// Debugging
////////////////////////////////////////////////////////////////////////////////
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