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Merge branch 'Xphalnos-VirtualAlloc' into arm64

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Signed-off-by: Ronald Caesar <github43132@proton.me>
This commit is contained in:
Ronald Caesar 2025-10-07 16:20:05 -04:00
commit 0d4e5fd765
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GPG key ID: 04307C401999C596
2 changed files with 18 additions and 7 deletions
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21
src/host/memory/arena.cpp
View file

@ -1,7 +1,10 @@
#include "arena.h"
#include "common/passert.h"
#include <cstring>
#ifndef WIN32
#ifdef WIN32
#include <Windows.h>
#else
#include <sys/mman.h>
#endif
@ -10,12 +13,15 @@ namespace pound::host::memory
arena_t arena_init(size_t capacity)
{
// TODO(GloriousTaco:memory): Replace malloc with a windows memory mapping API.
#ifdef WIN32
auto data = static_cast<uint8_t*>(malloc(sizeof(size_t) * capacity));
void* const data = ::VirtualAlloc(nullptr, capacity, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
if (NULL == data)
{
return {0, 0, nullptr}; // Return invalid arena on failure
}
#else
void* data = ::mmap(nullptr, capacity, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (data == MAP_FAILED)
void* const data = ::mmap(nullptr, capacity, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (MAP_FAILED == data)
{
return {0, 0, nullptr}; // Return invalid arena on failure
}
@ -51,7 +57,12 @@ void arena_free(memory::arena_t* arena)
PVM_ASSERT(arena != nullptr);
arena->capacity = 0;
arena->size = 0;
// TODO(GloriousTaco:memory): Replace free with a memory safe alternative.
#ifdef WIN32
VirtualFree(arena->data, 0, MEM_RELEASE);
#else
free(arena->data);
#endif
}
} // namespace pound::host::memory

4
src/host/memory/arena_stl.h
View file

@ -59,13 +59,13 @@ struct arena_allocator
};
template <typename T, typename U>
inline bool operator==(const arena_allocator<T>& a, const arena_allocator<U>& b)
inline constexpr bool operator==(const arena_allocator<T>& a, const arena_allocator<U>& b)
{
return a.arena == b.arena;
}
template <typename T, typename U>
inline bool operator!=(const arena_allocator<T>& a, const arena_allocator<U>& b)
inline constexpr bool operator!=(const arena_allocator<T>& a, const arena_allocator<U>& b)
{
return a.arena != b.arena;
}