circuitpython/stmhal/gccollect.c

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#include <stdio.h>
#include <stm32f4xx_hal.h>
#include "misc.h"
#include "mpconfig.h"
#include "qstr.h"
#include "obj.h"
#include "gc.h"
#include "gccollect.h"
machine_uint_t gc_helper_get_regs_and_sp(machine_uint_t *regs);
// obsolete
// void gc_helper_get_regs_and_clean_stack(machine_uint_t *regs, machine_uint_t heap_end);
void gc_collect(void) {
// get current time, in case we want to time the GC
uint32_t start = HAL_GetTick();
// start the GC
gc_collect_start();
// We need to scan everything in RAM that can hold a pointer.
// The data segment is used, but should not contain pointers, so we just scan the bss.
gc_collect_root((void**)&_sbss, ((uint32_t)&_ebss - (uint32_t)&_sbss) / sizeof(uint32_t));
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// get the registers and the sp
machine_uint_t regs[10];
machine_uint_t sp = gc_helper_get_regs_and_sp(regs);
// trace the stack, including the registers (since they live on the stack in this function)
gc_collect_root((void**)sp, ((uint32_t)&_ram_end - sp) / sizeof(uint32_t));
// end the GC
gc_collect_end();
if (0) {
// print GC info
uint32_t ticks = HAL_GetTick() - start; // TODO implement a function that does this properly
gc_info_t info;
gc_info(&info);
printf("GC@%lu %lums\n", start, ticks);
printf(" " UINT_FMT " total\n", info.total);
printf(" " UINT_FMT " : " UINT_FMT "\n", info.used, info.free);
printf(" 1=" UINT_FMT " 2=" UINT_FMT " m=" UINT_FMT "\n", info.num_1block, info.num_2block, info.max_block);
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}
}
static mp_obj_t pyb_gc(void) {
gc_collect();
return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_0(pyb_gc_obj, pyb_gc);