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#include <stdlib.h>
#include "wasm/machine.h"
#include "wasm/asyncify.h"
#ifndef WASM_SCAN_STACK_BUFFER_SIZE
# define WASM_SCAN_STACK_BUFFER_SIZE 6144
#endif
struct asyncify_buf {
void *top;
void *end;
uint8_t buffer[WASM_SCAN_STACK_BUFFER_SIZE];
};
static void
init_asyncify_buf(struct asyncify_buf* buf)
{
buf->top = &buf->buffer[0];
buf->end = &buf->buffer[WASM_SCAN_STACK_BUFFER_SIZE];
}
static void *_rb_wasm_active_scan_buf = NULL;
void
rb_wasm_scan_locals(rb_wasm_scan_func scan)
{
static struct asyncify_buf buf;
static int spilling = 0;
if (!spilling) {
spilling = 1;
init_asyncify_buf(&buf);
_rb_wasm_active_scan_buf = &buf;
asyncify_start_unwind(&buf);
} else {
asyncify_stop_rewind();
spilling = 0;
_rb_wasm_active_scan_buf = NULL;
scan(buf.top, buf.end);
}
}
static void *rb_wasm_stack_base = NULL;
__attribute__((constructor))
int
rb_wasm_record_stack_base(void)
{
rb_wasm_stack_base = rb_wasm_get_stack_pointer();
return 0;
}
void *
rb_wasm_stack_get_base(void)
{
return rb_wasm_stack_base;
}
void *
rb_wasm_handle_scan_unwind(void)
{
return _rb_wasm_active_scan_buf;
}
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