MiMoEngine ASM: x86-64 MASM汇编+C混合架构游戏引擎
核心热路径(数学/内存/字符串/性能分析)用MASM汇编(SSE/AVX2) 外围系统(窗口/渲染/ECS/音频/UI/脚本)用C语言 含自研编辑器、VisualScript积木编程、中文渲染(glyph_atlas)
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; ============================================================================
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; memory.asm - 对齐内存分配器 (x86-64 MASM)
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; 支持 16/32/64 字节对齐 (SIMD 需要)
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; ============================================================================
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include asm_macros.inc
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.DATA
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ALIGN 16
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_alloc_header_size EQU 32 ; 分配头大小 (包含对齐偏移和原始指针)
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.CODE
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; ============================================================================
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; 对齐内存分配
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; ============================================================================
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; void* mem_aligned_alloc(uint64_t size, uint64_t alignment)
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; RCX = size, RDX = alignment
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; 返回: RAX = 对齐指针
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mem_aligned_alloc PROC
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push rbx
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push rdi
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push rsi
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sub rsp, 40 ; 保留栈空间
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mov rbx, rcx ; rbx = size
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mov rdi, rdx ; rdi = alignment
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; 验证 alignment 是 2 的幂
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mov rax, rdi
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dec rax
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test rdi, rax
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jnz alloc_invalid_alignment
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; 确保 alignment >= 16
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cmp rdi, 16
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jae alloc_alignment_ok
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mov rdi, 16
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alloc_alignment_ok:
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; 需要的总大小 = size + alignment + header
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mov rax, rbx
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add rax, rdi ; + alignment
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add rax, _alloc_header_size ; + header
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mov rsi, rax ; rsi = total size
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; 调用 malloc
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mov rcx, rsi
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call malloc
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test rax, rax
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jz alloc_failed
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; rax = 原始指针
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; 计算对齐后的地址
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mov rcx, rax
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add rcx, _alloc_header_size ; 跳过 header
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; 对齐
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mov rdx, rdi
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dec rdx
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not rdx
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add rcx, rdx ; 加上 alignment-1
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and rcx, rdx ; 对齐到 alignment
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; rcx = 对齐后的指针
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; 在对齐指针前存储原始指针
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mov [rcx - 8], rax ; 存储原始 malloc 指针
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mov [rcx - 16], rbx ; 存储请求的 size
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mov [rcx - 24], rdi ; 存储 alignment
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mov [rcx - 32], rsi ; 存储 total size
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mov rax, rcx ; 返回对齐指针
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jmp alloc_done
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alloc_invalid_alignment:
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xor rax, rax ; 返回 NULL
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jmp alloc_done
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alloc_failed:
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xor rax, rax
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alloc_done:
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add rsp, 40
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pop rsi
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pop rdi
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pop rbx
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ret
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mem_aligned_alloc ENDP
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; void mem_aligned_free(void* ptr)
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; RCX = ptr (对齐指针)
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mem_aligned_free PROC
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test rcx, rcx
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jz free_done
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; 获取原始 malloc 指针
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mov rax, [rcx - 8]
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test rax, rax
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jz free_done
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; 调用 free
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mov rcx, rax
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call free
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free_done:
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ret
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mem_aligned_free ENDP
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; void* mem_aligned_realloc(void* ptr, uint64_t size, uint64_t alignment)
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; RCX = ptr, RDX = size, R8 = alignment
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; 返回: RAX = 新对齐指针
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mem_aligned_realloc PROC
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push rbx
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push rdi
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push rsi
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push r12
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sub rsp, 40
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mov rbx, rdx ; rbx = new size
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mov rdi, r8 ; rdi = alignment
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; 如果 ptr 为 NULL, 直接分配
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test rcx, rcx
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jz realloc_alloc
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; 保存旧信息
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mov rsi, [rcx - 8] ; 原始指针
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mov r12, [rcx - 16] ; 旧 size
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; 分配新内存
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mov rcx, rbx
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mov rdx, rdi
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call mem_aligned_alloc
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test rax, rax
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jz realloc_failed
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; 复制旧数据 (取较小值)
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mov rdx, r12
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cmp rdx, rbx
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jbe realloc_copy_ok
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mov rdx, rbx
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realloc_copy_ok:
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mov rdi, rax ; 保存新指针
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mov rcx, rax ; dst
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; rsi = 旧数据起始
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mov rsi, [rcx - 8] ; 旧原始指针
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; 需要获取旧的对齐偏移
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; 简化: 直接复制
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call fast_memcpy
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; 释放旧内存
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mov rcx, rsi
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call mem_aligned_free
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mov rax, rdi ; 返回新指针
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jmp realloc_done
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realloc_alloc:
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mov rcx, rbx
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mov rdx, rdi
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call mem_aligned_alloc
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jmp realloc_done
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realloc_failed:
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xor rax, rax
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realloc_done:
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add rsp, 40
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pop r12
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pop rsi
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pop rdi
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pop rbx
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ret
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mem_aligned_realloc ENDP
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END
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