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Merge pull request #5245 from jepler/pool-fix-circuitpython 

gc.c: Ensure a gap of one byte before the finaliser table.
This commit is contained in:
Scott Shawcroft 2021-08-27 09:33:05 -07:00 committed by GitHub
parent 3e9daeca8f 955c0276c2
commit 31b9dd408d
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 16 additions and 2 deletions
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13
py/gc.c
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@ -32,6 +32,10 @@
#include "py/gc.h"
#include "py/runtime.h"
#if MICROPY_DEBUG_VALGRIND
#include <valgrind/memcheck.h>
#endif
#include "supervisor/shared/safe_mode.h"
#if CIRCUITPY_MEMORYMONITOR
@ -126,7 +130,7 @@ void gc_init(void *start, void *end) {
// => T = A * (1 + BLOCKS_PER_ATB / BLOCKS_PER_FTB + BLOCKS_PER_ATB * BYTES_PER_BLOCK)
size_t total_byte_len = (byte *)end - (byte *)start;
#if MICROPY_ENABLE_FINALISER
MP_STATE_MEM(gc_alloc_table_byte_len) = total_byte_len * MP_BITS_PER_BYTE / (MP_BITS_PER_BYTE + MP_BITS_PER_BYTE * BLOCKS_PER_ATB / BLOCKS_PER_FTB + MP_BITS_PER_BYTE * BLOCKS_PER_ATB * BYTES_PER_BLOCK);
MP_STATE_MEM(gc_alloc_table_byte_len) = (total_byte_len - 1) * MP_BITS_PER_BYTE / (MP_BITS_PER_BYTE + MP_BITS_PER_BYTE * BLOCKS_PER_ATB / BLOCKS_PER_FTB + MP_BITS_PER_BYTE * BLOCKS_PER_ATB * BYTES_PER_BLOCK);
#else
MP_STATE_MEM(gc_alloc_table_byte_len) = total_byte_len / (1 + MP_BITS_PER_BYTE / 2 * BYTES_PER_BLOCK);
#endif
@ -135,7 +139,7 @@ void gc_init(void *start, void *end) {
#if MICROPY_ENABLE_FINALISER
size_t gc_finaliser_table_byte_len = (MP_STATE_MEM(gc_alloc_table_byte_len) * BLOCKS_PER_ATB + BLOCKS_PER_FTB - 1) / BLOCKS_PER_FTB;
MP_STATE_MEM(gc_finaliser_table_start) = MP_STATE_MEM(gc_alloc_table_start) + MP_STATE_MEM(gc_alloc_table_byte_len);
MP_STATE_MEM(gc_finaliser_table_start) = MP_STATE_MEM(gc_alloc_table_start) + MP_STATE_MEM(gc_alloc_table_byte_len) + 1;
#endif
size_t gc_pool_block_len = MP_STATE_MEM(gc_alloc_table_byte_len) * BLOCKS_PER_ATB;
@ -391,6 +395,11 @@ void gc_collect_ptr(void *ptr) {
__attribute__((no_sanitize_address))
#endif
static void *gc_get_ptr(void **ptrs, int i) {
#if MICROPY_DEBUG_VALGRIND
if (!VALGRIND_CHECK_MEM_IS_ADDRESSABLE(&ptrs[i], sizeof(*ptrs))) {
return NULL;
}
#endif
return ptrs[i];
}

5
py/mpconfig.h
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@ -486,6 +486,11 @@
#define MICROPY_DEBUG_VM_STACK_OVERFLOW (0)
#endif
// Whether to enable extra instrumentation for valgrind
#ifndef MICROPY_DEBUG_VALGRIND
#define MICROPY_DEBUG_VALGRIND (0)
#endif
/*****************************************************************************/
/* Optimisations */