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b41e8b9d4f
arena_init() has been given the parameter `size_t capacity`, however, docs amd some definitions wasn't changed to reflect this. The definition MEMORY_CAPACITY was replaced by `size_t capacity` but it wasn't removed. Signed-off-by: Ronald Caesar <github43132@proton.me>
53 lines
1.5 KiB
C++
53 lines
1.5 KiB
C++
#include "arena.h"
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#include "Base/Assert.h"
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#ifndef WIN32
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#include <sys/mman.h>
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#endif
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memory::arena_t memory::arena_init(size_t capacity)
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{
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// TODO(GloriousTaco:memory): Replace malloc with a windows memory mapping API.
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#ifdef WIN32
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auto data = static_cast<uint8_t*>(malloc(sizeof(size_t) * capacity));
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#else
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void* data = ::mmap(nullptr, capacity, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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if (data == MAP_FAILED)
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{
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return {0, 0, nullptr}; // Return invalid arena on failure
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}
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#endif
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(void)std::memset(data, POISON_PATTERN, capacity);
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memory::arena_t arena = {
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.capacity = capacity,
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.size = 0,
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.data = data,
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};
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return arena;
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}
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// new more memsafe code (ownedbywuigi) (i give up on windows compatibility for now, will stick to the old unsafe code)
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const void* memory::arena_allocate(memory::arena_t* arena, const std::size_t size)
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{
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ASSERT(arena != nullptr);
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ASSERT(arena->size + size < arena->capacity);
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const void* const data = &arena->data + arena->size;
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arena->size += size;
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return data;
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}
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void memory::arena_reset(memory::arena_t* arena)
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{
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ASSERT(nullptr != arena);
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ASSERT(nullptr != arena->data);
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arena->size = 0;
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(void)std::memset(arena->data, POISON_PATTERN, arena->capacity);
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}
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void memory::arena_free(memory::arena_t* arena)
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{
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ASSERT(arena != nullptr);
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arena->capacity = 0;
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arena->size = 0;
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// TODO(GloriousTaco:memory): Replace free with a memory safe alternative.
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free(arena->data);
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}
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