circuitpython/unix/gccollect.c

69 lines
1.7 KiB
C

#include <stdint.h>
#include <stdio.h>
#include "misc.h"
#include "mpconfig.h"
#include "gc.h"
#if MICROPY_ENABLE_GC
extern void *stack_top;
// We capture here callee-save registers, i.e. ones which may contain
// interesting values held there by our callers. It doesn't make sense
// to capture caller-saved registers, because they, well, put on the
// stack already by the caller.
#ifdef __x86_64__
typedef machine_uint_t regs_t[6];
void gc_helper_get_regs(regs_t arr) {
register long rbx asm ("rbx");
register long rbp asm ("rbp");
register long r12 asm ("r12");
register long r13 asm ("r13");
register long r14 asm ("r14");
register long r15 asm ("r15");
arr[0] = rbx;
arr[1] = rbp;
arr[2] = r12;
arr[3] = r13;
arr[4] = r14;
arr[5] = r15;
}
#endif
#ifdef __i386__
typedef machine_uint_t regs_t[4];
void gc_helper_get_regs(regs_t arr) {
register long ebx asm ("ebx");
register long esi asm ("esi");
register long edi asm ("edi");
register long ebp asm ("ebp");
arr[0] = ebx;
arr[1] = esi;
arr[2] = edi;
arr[3] = ebp;
}
#endif
void gc_collect(void) {
//gc_dump_info();
gc_collect_start();
// this traces .data and .bss sections
extern char __bss_start, _end;
//printf(".bss: %p-%p\n", &__bss_start, &_end);
gc_collect_root((void**)&__bss_start, ((uint32_t)&_end - (uint32_t)&__bss_start) / sizeof(uint32_t));
regs_t regs;
gc_helper_get_regs(regs);
// GC stack (and regs because we captured them)
gc_collect_root((void**)&regs, ((uint32_t)stack_top - (uint32_t)&regs) / sizeof(uint32_t));
gc_collect_end();
//printf("-----\n");
//gc_dump_info();
}
#endif //MICROPY_ENABLE_GC