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use uint8_t bit fields, and improve portability of page_flags type

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daan 2019-10-17 12:07:26 -07:00
parent 72d1ab80c3
commit 26c27fbf58
2 changed files with 14 additions and 13 deletions
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23
include/mimalloc-types.h
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@ -132,15 +132,16 @@ typedef enum mi_delayed_e {
// The `in_full` and `has_aligned` page flags are put in a union to efficiently // The `in_full` and `has_aligned` page flags are put in a union to efficiently
// test if both are false (`value == 0`) in the `mi_free` routine. // test if both are false (`value == 0`) in the `mi_free` routine.
typedef union mi_page_flags_u { typedef struct mi_page_flags_s {
uint16_t value; #pragma warning(suppress:4201)
union {
uint8_t full_aligned; uint8_t full_aligned;
struct { // force alignment struct {
unsigned in_full:1; uint8_t in_full : 1;
unsigned has_aligned:1; uint8_t has_aligned : 1;
bool is_zero; // `true` if the blocks in the free list are zero initialized
#pragma warning(suppress:4201)
}; };
};
bool is_zero; // `true` if the blocks in the free list are zero initialized
} mi_page_flags_t; } mi_page_flags_t;
// Thread free list. // Thread free list.
@ -168,10 +169,10 @@ typedef uintptr_t mi_thread_free_t;
typedef struct mi_page_s { typedef struct mi_page_s {
// "owned" by the segment // "owned" by the segment
uint8_t segment_idx; // index in the segment `pages` array, `page == &segment->pages[page->segment_idx]` uint8_t segment_idx; // index in the segment `pages` array, `page == &segment->pages[page->segment_idx]`
unsigned segment_in_use:1; // `true` if the segment allocated this page uint8_t segment_in_use:1; // `true` if the segment allocated this page
unsigned is_reset:1; // `true` if the page memory was reset uint8_t is_reset:1; // `true` if the page memory was reset
unsigned is_committed:1; // `true` if the page virtual memory is committed uint8_t is_committed:1; // `true` if the page virtual memory is committed
unsigned is_zero_init:1; // `true` if the page was zero initialized uint8_t is_zero_init:1; // `true` if the page was zero initialized
// layout like this to optimize access in `mi_malloc` and `mi_free` // layout like this to optimize access in `mi_malloc` and `mi_free`
uint16_t capacity; // number of blocks committed, must be the first field, see `segment.c:page_clear` uint16_t capacity; // number of blocks committed, must be the first field, see `segment.c:page_clear`

2
src/init.c
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@ -13,7 +13,7 @@ terms of the MIT license. A copy of the license can be found in the file
// Empty page used to initialize the small free pages array // Empty page used to initialize the small free pages array
const mi_page_t _mi_page_empty = { const mi_page_t _mi_page_empty = {
0, false, false, false, false, 0, 0, 0, false, false, false, false, 0, 0,
{ 0 }, { { 0 }, false },
NULL, // free NULL, // free
#if MI_SECURE #if MI_SECURE
0, 0,