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[examples] finish overrides touch ups; tweak overrides example

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This commit is contained in:
Allen Webster
2021-10-08 15:32:16 -07:00
parent 204af74b31
commit feee8cf745
2 changed files with 21 additions and 13 deletions
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examples/advanced_usages/overrides.c
+3
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@@ -68,6 +68,9 @@ void md_release_by_example_allocator(void *ptr, unsigned long long ignore);
#define MD_IMPL_Decommit(p,z) ((void)0)
#define MD_IMPL_Release md_release_by_example_allocator
#define MD_DEFAULT_ARENA_RES_SIZE (1 << 20)
#define MD_DEFAULT_ARENA_CMT_SIZE (1 << 20)
// override file loading
source/md.c
+18 -13
View File
@@ -27,15 +27,16 @@
** #define MD_IMPL_Decommit (void*, uint64) -> void
** #define MD_IMPL_Release (void*, uint64) -> void
**
**
** "arena" ** REQUIRED
** #define MD_IMPL_Arena <type> (must set before including md.h)
** #define MD_IMPL_ArenaMinPos uint64
** #define MD_IMPL_ArenaAlloc () -> MD_IMPL_Arena*
** #define MD_IMPL_ArenaRelease (MD_IMPL_Arena*) -> void
** #define MD_IMPL_ArenaGetPos (MD_IMPL_Arena*) -> uint64
** #define MD_IMPL_ArenaPush (MD_IMPL_Arena*, uint64) -> void*
** #define MD_IMPL_ArenaPopTo (MD_IMPL_Arena*, uint64) -> void
** #define MD_IMPL_ArenaSetAutoAlign (MD_IMPL_Arena*, uint64) -> void
** #define MD_IMPL_ArenaHeaderSize uint64
**
** "scratch" ** REQUIRED
** #define MD_IMPL_GetScratch (MD_IMPL_Arena**, uint64) -> MD_IMPL_Arena*
@@ -45,6 +46,10 @@
** "sprintf" ** REQUIRED
** #define MD_IMPL_Vsnprintf (char*, uint64, char const*, va_list) -> uint64
**
** Static Parameters to the Default Arena Implementation
** #define MD_DEFAULT_ARENA_RES_SIZE uint64 [default 64 megabytes]
** #define MD_DEFAULT_ARENA_CMT_SIZE uint64 [default 64 kilabytes]
**
** Default Implementation Controls
** These controls default to '1' i.e. 'enabled'
** #define MD_DEFAULT_BASIC_TYPES -> construct "basic types" from stdint.h header
@@ -413,7 +418,7 @@ MD_LINUX_Release(void *ptr, MD_u64 size)
# define MD_DEFAULT_ARENA_CMT_SIZE (64 << 10)
#endif
#define MD_DEFAULT_ARENA_VERY_BIG (MD_DEFAULT_ARENA_RES_SIZE - MD_IMPL_ArenaHeaderSize)/2
#define MD_DEFAULT_ARENA_VERY_BIG (MD_DEFAULT_ARENA_RES_SIZE - MD_IMPL_ArenaMinPos)/2
//- "low level memory" implementation check
#if !defined(MD_IMPL_Reserve)
@@ -429,8 +434,8 @@ MD_LINUX_Release(void *ptr, MD_u64 size)
# error Missing implementation for MD_IMPL_Release
#endif
#define MD_IMPL_ArenaHeaderSize 64
MD_StaticAssert(sizeof(MD_ArenaDefault) <= MD_IMPL_ArenaHeaderSize, arena_def_size_check);
#define MD_IMPL_ArenaMinPos 64
MD_StaticAssert(sizeof(MD_ArenaDefault) <= MD_IMPL_ArenaMinPos, arena_def_size_check);
#define MD_IMPL_ArenaAlloc MD_ArenaDefaultAlloc
#define MD_IMPL_ArenaRelease MD_ArenaDefaultRelease
@@ -442,7 +447,7 @@ MD_StaticAssert(sizeof(MD_ArenaDefault) <= MD_IMPL_ArenaHeaderSize, arena_def_si
static MD_ArenaDefault*
MD_ArenaDefaultAlloc__Size(MD_u64 cmt, MD_u64 res)
{
MD_Assert(MD_IMPL_ArenaHeaderSize < cmt && cmt <= res);
MD_Assert(MD_IMPL_ArenaMinPos < cmt && cmt <= res);
MD_u64 cmt_clamped = MD_ClampTop(cmt, res);
MD_ArenaDefault *result = 0;
void *mem = MD_IMPL_Reserve(res);
@@ -452,7 +457,7 @@ MD_ArenaDefaultAlloc__Size(MD_u64 cmt, MD_u64 res)
result->prev = 0;
result->current = result;
result->base_pos = 0;
result->pos = MD_IMPL_ArenaHeaderSize;
result->pos = MD_IMPL_ArenaMinPos;
result->cmt = cmt_clamped;
result->cap = res;
result->align = 8;
@@ -512,7 +517,7 @@ MD_ArenaDefaultPush(MD_ArenaDefault *arena, MD_u64 size)
MD_ArenaDefault *new_arena = 0;
if (size > MD_DEFAULT_ARENA_VERY_BIG)
{
MD_u64 big_size_unrounded = size + MD_IMPL_ArenaHeaderSize;
MD_u64 big_size_unrounded = size + MD_IMPL_ArenaMinPos;
MD_u64 big_size = MD_AlignPow2(big_size_unrounded, (4 << 10));
new_arena = MD_ArenaDefaultAlloc__Size(big_size, big_size);
}
@@ -564,7 +569,7 @@ static void
MD_ArenaDefaultPopTo(MD_ArenaDefault *arena, MD_u64 pos)
{
// pop chunks in the chain
MD_u64 pos_clamped = MD_ClampBot(MD_IMPL_ArenaHeaderSize, pos);
MD_u64 pos_clamped = MD_ClampBot(MD_IMPL_ArenaMinPos, pos);
{
MD_ArenaDefault *node = arena->current;
for (MD_ArenaDefault *prev = 0;
@@ -581,7 +586,7 @@ MD_ArenaDefaultPopTo(MD_ArenaDefault *arena, MD_u64 pos)
{
MD_ArenaDefault *current = arena->current;
MD_u64 local_pos_unclamped = pos - current->base_pos;
MD_u64 local_pos = MD_ClampBot(local_pos_unclamped, MD_IMPL_ArenaHeaderSize);
MD_u64 local_pos = MD_ClampBot(local_pos_unclamped, MD_IMPL_ArenaMinPos);
current->pos = local_pos;
}
}
@@ -613,8 +618,8 @@ MD_ArenaDefaultSetAutoAlign(MD_ArenaDefault *arena, MD_u64 align)
#if !defined(MD_IMPL_ArenaSetAutoAlign)
# error Missing implementation for MD_IMPL_ArenaSetAutoAlign
#endif
#if !defined(MD_IMPL_ArenaHeaderSize)
# error Missing implementation for MD_IMPL_ArenaHeaderSize
#if !defined(MD_IMPL_ArenaMinPos)
# error Missing implementation for MD_IMPL_ArenaMinPos
#endif
//~/////////////////////////////////////////////////////////////////////////////
@@ -728,7 +733,7 @@ MD_ArenaPutBack(MD_Arena *arena, MD_u64 size)
{
MD_u64 pos = MD_IMPL_ArenaGetPos(arena);
MD_u64 new_pos = pos - size;
MD_u64 new_pos_clamped = MD_ClampBot(MD_IMPL_ArenaHeaderSize, new_pos);
MD_u64 new_pos_clamped = MD_ClampBot(MD_IMPL_ArenaMinPos, new_pos);
MD_IMPL_ArenaPopTo(arena, new_pos_clamped);
}
@@ -754,7 +759,7 @@ MD_ArenaPushAlign(MD_Arena *arena, MD_u64 boundary)
MD_FUNCTION void
MD_ArenaClear(MD_Arena *arena)
{
MD_IMPL_ArenaPopTo(arena, MD_IMPL_ArenaHeaderSize);
MD_IMPL_ArenaPopTo(arena, MD_IMPL_ArenaMinPos);
}
MD_FUNCTION MD_ArenaTemp