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Update mimalloc to v2.1.2 (#4740)
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The mimalloc project [has released a couple
versions](https://github.com/microsoft/mimalloc?tab=readme-ov-file#releases)
since we last integrated it into Git for Windows. Let's take the most
recent one.

This PR is structured in the following way:

1. Revert all mimalloc commits, in reverse chronological order (newest
first), marking them as `fixup!`s of the reverted commits.
2. Import (a subset of) mimalloc v2.1.2, marking it as an `amend!` of
the commit that originally imported mimalloc.
3. Replay the remaining mimalloc commits, in chronological order,
marking them as `fixup!`s of the original commits.
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@dscho
dscho authored Dec 21, 2023
2 parents a0e4621 + 1475d9f commit 9cdc478
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Showing 25 changed files with 3,055 additions and 3,757 deletions.
2 changes: 2 additions & 0 deletions Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -2088,8 +2088,10 @@ ifdef USE_MIMALLOC
compat/mimalloc/os.o \
compat/mimalloc/page.o \
compat/mimalloc/random.o \
compat/mimalloc/prim/windows/prim.o \
compat/mimalloc/segment.o \
compat/mimalloc/segment-cache.o \
compat/mimalloc/segment-map.o \
compat/mimalloc/stats.o

COMPAT_CFLAGS += -Icompat/mimalloc -DMI_DEBUG=0 -DUSE_MIMALLOC --std=gnu11
Expand Down
86 changes: 39 additions & 47 deletions compat/mimalloc/alloc-aligned.c
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Original file line number Diff line number Diff line change
Expand Up @@ -6,9 +6,10 @@ terms of the MIT license. A copy of the license can be found in the file
-----------------------------------------------------------------------------*/

#include "mimalloc.h"
#include "mimalloc-internal.h"
#include "mimalloc/internal.h"
#include "mimalloc/prim.h" // mi_prim_get_default_heap

#include <string.h> // memset
#include <string.h> // memset

// ------------------------------------------------------
// Aligned Allocation
Expand Down Expand Up @@ -61,52 +62,44 @@ static mi_decl_noinline void* mi_heap_malloc_zero_aligned_at_fallback(mi_heap_t*
mi_assert_internal(adjust < alignment);
void* aligned_p = (void*)((uintptr_t)p + adjust);
if (aligned_p != p) {
mi_page_set_has_aligned(_mi_ptr_page(p), true);
mi_page_t* page = _mi_ptr_page(p);
mi_page_set_has_aligned(page, true);
_mi_padding_shrink(page, (mi_block_t*)p, adjust + size);
}
// todo: expand padding if overallocated ?

mi_assert_internal(mi_page_usable_block_size(_mi_ptr_page(p)) >= adjust + size);
mi_assert_internal(p == _mi_page_ptr_unalign(_mi_ptr_segment(aligned_p), _mi_ptr_page(aligned_p), aligned_p));
mi_assert_internal(((uintptr_t)aligned_p + offset) % alignment == 0);
mi_assert_internal(mi_page_usable_block_size(_mi_ptr_page(p)) >= adjust + size);
mi_assert_internal(mi_usable_size(aligned_p)>=size);
mi_assert_internal(mi_usable_size(p) == mi_usable_size(aligned_p)+adjust);

// now zero the block if needed
if (zero && alignment > MI_ALIGNMENT_MAX) {
const ptrdiff_t diff = (uint8_t*)aligned_p - (uint8_t*)p;
const ptrdiff_t zsize = mi_page_usable_block_size(_mi_ptr_page(p)) - diff - MI_PADDING_SIZE;
if (zsize > 0) { _mi_memzero(aligned_p, zsize); }
if (alignment > MI_ALIGNMENT_MAX) {
// for the tracker, on huge aligned allocations only from the start of the large block is defined
mi_track_mem_undefined(aligned_p, size);
if (zero) {
_mi_memzero_aligned(aligned_p, mi_usable_size(aligned_p));
}
}

#if MI_TRACK_ENABLED
if (p != aligned_p) {
mi_track_free_size(p, oversize);
mi_track_malloc(aligned_p, size, zero);
}
else {
mi_track_resize(aligned_p, oversize, size);
mi_track_align(p,aligned_p,adjust,mi_usable_size(aligned_p));
}
#endif
return aligned_p;
}

// Primitive aligned allocation
static void* mi_heap_malloc_zero_aligned_at(mi_heap_t* const heap, const size_t size, const size_t alignment, const size_t offset, const bool zero) mi_attr_noexcept
{
// note: we don't require `size > offset`, we just guarantee that the address at offset is aligned regardless of the allocated size.
mi_assert(alignment > 0);
if mi_unlikely(alignment == 0 || !_mi_is_power_of_two(alignment)) { // require power-of-two (see <https://en.cppreference.com/w/c/memory/aligned_alloc>)
#if MI_DEBUG > 0
_mi_error_message(EOVERFLOW, "aligned allocation requires the alignment to be a power-of-two (size %zu, alignment %zu)\n", size, alignment);
#endif
return NULL;
}
/*
if mi_unlikely(alignment > MI_ALIGNMENT_MAX) { // we cannot align at a boundary larger than this (or otherwise we cannot find segment headers)
#if MI_DEBUG > 0
_mi_error_message(EOVERFLOW, "aligned allocation has a maximum alignment of %zu (size %zu, alignment %zu)\n", MI_ALIGNMENT_MAX, size, alignment);
#endif
return NULL;
}
*/

if mi_unlikely(size > PTRDIFF_MAX) { // we don't allocate more than PTRDIFF_MAX (see <https://sourceware.org/ml/libc-announce/2019/msg00001.html>)
#if MI_DEBUG > 0
_mi_error_message(EOVERFLOW, "aligned allocation request is too large (size %zu, alignment %zu)\n", size, alignment);
Expand Down Expand Up @@ -146,9 +139,9 @@ mi_decl_nodiscard mi_decl_restrict void* mi_heap_malloc_aligned_at(mi_heap_t* he
}

mi_decl_nodiscard mi_decl_restrict void* mi_heap_malloc_aligned(mi_heap_t* heap, size_t size, size_t alignment) mi_attr_noexcept {
if mi_unlikely(alignment == 0 || !_mi_is_power_of_two(alignment)) return NULL;
#if !MI_PADDING
// without padding, any small sized allocation is naturally aligned (see also `_mi_segment_page_start`)
if (!_mi_is_power_of_two(alignment)) return NULL;
if mi_likely(_mi_is_power_of_two(size) && size >= alignment && size <= MI_SMALL_SIZE_MAX)
#else
// with padding, we can only guarantee this for fixed alignments
Expand All @@ -164,6 +157,11 @@ mi_decl_nodiscard mi_decl_restrict void* mi_heap_malloc_aligned(mi_heap_t* heap,
}
}

// ensure a definition is emitted
#if defined(__cplusplus)
static void* _mi_heap_malloc_aligned = (void*)&mi_heap_malloc_aligned;
#endif

// ------------------------------------------------------
// Aligned Allocation
// ------------------------------------------------------
Expand All @@ -187,27 +185,27 @@ mi_decl_nodiscard mi_decl_restrict void* mi_heap_calloc_aligned(mi_heap_t* heap,
}

mi_decl_nodiscard mi_decl_restrict void* mi_malloc_aligned_at(size_t size, size_t alignment, size_t offset) mi_attr_noexcept {
return mi_heap_malloc_aligned_at(mi_get_default_heap(), size, alignment, offset);
return mi_heap_malloc_aligned_at(mi_prim_get_default_heap(), size, alignment, offset);
}

mi_decl_nodiscard mi_decl_restrict void* mi_malloc_aligned(size_t size, size_t alignment) mi_attr_noexcept {
return mi_heap_malloc_aligned(mi_get_default_heap(), size, alignment);
return mi_heap_malloc_aligned(mi_prim_get_default_heap(), size, alignment);
}

mi_decl_nodiscard mi_decl_restrict void* mi_zalloc_aligned_at(size_t size, size_t alignment, size_t offset) mi_attr_noexcept {
return mi_heap_zalloc_aligned_at(mi_get_default_heap(), size, alignment, offset);
return mi_heap_zalloc_aligned_at(mi_prim_get_default_heap(), size, alignment, offset);
}

mi_decl_nodiscard mi_decl_restrict void* mi_zalloc_aligned(size_t size, size_t alignment) mi_attr_noexcept {
return mi_heap_zalloc_aligned(mi_get_default_heap(), size, alignment);
return mi_heap_zalloc_aligned(mi_prim_get_default_heap(), size, alignment);
}

mi_decl_nodiscard mi_decl_restrict void* mi_calloc_aligned_at(size_t count, size_t size, size_t alignment, size_t offset) mi_attr_noexcept {
return mi_heap_calloc_aligned_at(mi_get_default_heap(), count, size, alignment, offset);
return mi_heap_calloc_aligned_at(mi_prim_get_default_heap(), count, size, alignment, offset);
}

mi_decl_nodiscard mi_decl_restrict void* mi_calloc_aligned(size_t count, size_t size, size_t alignment) mi_attr_noexcept {
return mi_heap_calloc_aligned(mi_get_default_heap(), count, size, alignment);
return mi_heap_calloc_aligned(mi_prim_get_default_heap(), count, size, alignment);
}


Expand All @@ -225,19 +223,13 @@ static void* mi_heap_realloc_zero_aligned_at(mi_heap_t* heap, void* p, size_t ne
return p; // reallocation still fits, is aligned and not more than 50% waste
}
else {
// note: we don't zero allocate upfront so we only zero initialize the expanded part
void* newp = mi_heap_malloc_aligned_at(heap,newsize,alignment,offset);
if (newp != NULL) {
if (zero && newsize > size) {
const mi_page_t* page = _mi_ptr_page(newp);
if (page->is_zero) {
// already zero initialized
mi_assert_expensive(mi_mem_is_zero(newp,newsize));
}
else {
// also set last word in the previous allocation to zero to ensure any padding is zero-initialized
size_t start = (size >= sizeof(intptr_t) ? size - sizeof(intptr_t) : 0);
memset((uint8_t*)newp + start, 0, newsize - start);
}
// also set last word in the previous allocation to zero to ensure any padding is zero-initialized
size_t start = (size >= sizeof(intptr_t) ? size - sizeof(intptr_t) : 0);
_mi_memzero((uint8_t*)newp + start, newsize - start);
}
_mi_memcpy_aligned(newp, p, (newsize > size ? size : newsize));
mi_free(p); // only free if successful
Expand Down Expand Up @@ -282,25 +274,25 @@ mi_decl_nodiscard void* mi_heap_recalloc_aligned(mi_heap_t* heap, void* p, size_
}

mi_decl_nodiscard void* mi_realloc_aligned_at(void* p, size_t newsize, size_t alignment, size_t offset) mi_attr_noexcept {
return mi_heap_realloc_aligned_at(mi_get_default_heap(), p, newsize, alignment, offset);
return mi_heap_realloc_aligned_at(mi_prim_get_default_heap(), p, newsize, alignment, offset);
}

mi_decl_nodiscard void* mi_realloc_aligned(void* p, size_t newsize, size_t alignment) mi_attr_noexcept {
return mi_heap_realloc_aligned(mi_get_default_heap(), p, newsize, alignment);
return mi_heap_realloc_aligned(mi_prim_get_default_heap(), p, newsize, alignment);
}

mi_decl_nodiscard void* mi_rezalloc_aligned_at(void* p, size_t newsize, size_t alignment, size_t offset) mi_attr_noexcept {
return mi_heap_rezalloc_aligned_at(mi_get_default_heap(), p, newsize, alignment, offset);
return mi_heap_rezalloc_aligned_at(mi_prim_get_default_heap(), p, newsize, alignment, offset);
}

mi_decl_nodiscard void* mi_rezalloc_aligned(void* p, size_t newsize, size_t alignment) mi_attr_noexcept {
return mi_heap_rezalloc_aligned(mi_get_default_heap(), p, newsize, alignment);
return mi_heap_rezalloc_aligned(mi_prim_get_default_heap(), p, newsize, alignment);
}

mi_decl_nodiscard void* mi_recalloc_aligned_at(void* p, size_t newcount, size_t size, size_t alignment, size_t offset) mi_attr_noexcept {
return mi_heap_recalloc_aligned_at(mi_get_default_heap(), p, newcount, size, alignment, offset);
return mi_heap_recalloc_aligned_at(mi_prim_get_default_heap(), p, newcount, size, alignment, offset);
}

mi_decl_nodiscard void* mi_recalloc_aligned(void* p, size_t newcount, size_t size, size_t alignment) mi_attr_noexcept {
return mi_heap_recalloc_aligned(mi_get_default_heap(), p, newcount, size, alignment);
return mi_heap_recalloc_aligned(mi_prim_get_default_heap(), p, newcount, size, alignment);
}
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