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gc.c: Use dedicated APIs for conservative GC in Emscripten

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Emscripten provides "emscripten_scan_stack" to get the beginning and end
pointers of the stack for conservative GC.
Also, "emscripten_scan_registers" allows the GC to mark local variables
in WASM.
This commit is contained in:
Yusuke Endoh 2021-03-19 12:35:48 +09:00
parent e79b42c9b2
commit c576e63ee7
1 changed files with 26 additions and 0 deletions
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26
gc.c
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@ -71,6 +71,10 @@
#include <sys/types.h>
#ifdef __EMSCRIPTEN__
#include <emscripten.h>
#endif
#include "constant.h"
#include "debug_counter.h"
#include "eval_intern.h"
@ -5895,6 +5899,7 @@ mark_const_tbl(rb_objspace_t *objspace, struct rb_id_table *tbl)
static void mark_stack_locations(rb_objspace_t *objspace, const rb_execution_context_t *ec,
const VALUE *stack_start, const VALUE *stack_end);
#ifndef __EMSCRIPTEN__
static void
mark_current_machine_context(rb_objspace_t *objspace, rb_execution_context_t *ec)
{
@ -5919,6 +5924,27 @@ mark_current_machine_context(rb_objspace_t *objspace, rb_execution_context_t *ec
mark_stack_locations(objspace, ec, stack_start, stack_end);
}
#else
static VALUE *rb_emscripten_stack_range_tmp[2];
static void
rb_emscripten_mark_locations(void *begin, void *end)
{
rb_emscripten_stack_range_tmp[0] = begin;
rb_emscripten_stack_range_tmp[1] = end;
}
static void
mark_current_machine_context(rb_objspace_t *objspace, rb_execution_context_t *ec)
{
emscripten_scan_stack(rb_emscripten_mark_locations);
mark_stack_locations(objspace, ec, rb_emscripten_stack_range_tmp[0], rb_emscripten_stack_range_tmp[1]);
emscripten_scan_registers(rb_emscripten_mark_locations);
mark_stack_locations(objspace, ec, rb_emscripten_stack_range_tmp[0], rb_emscripten_stack_range_tmp[1]);
}
#endif
void
rb_gc_mark_machine_stack(const rb_execution_context_t *ec)