feat: add __internal/memory

README.md

@@ -90,6 +90,8 @@ Project or files:
 ├── __image
 │   ├── plotters
 │   └── svg
+├── __internal
+│   └── memory
 ├── __lang
 │   ├── boa
 │   ├── java
@@ -261,6 +263,6 @@ Project or files:
     ├── vec.rs
     └── while.rs
 
-230 directories, 39 files
+232 directories, 39 files
 ```
 

__internal/memory/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "memory"
+version = "0.1.0"

__internal/memory/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "memory"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

__internal/memory/README.md

@@ -0,0 +1,3 @@
+
+Reference:
+* https://radu-matei.com/blog/practical-guide-to-wasm-memory/

__internal/memory/src/main.rs

@@ -0,0 +1,39 @@
+#[no_mangle]
+pub fn malloc_1(len: usize) -> *mut u8 {
+    let mut buf = Vec::with_capacity(len);
+    let ptr = buf.as_mut_ptr();
+    std::mem::forget(buf);
+    return ptr;
+}
+
+#[no_mangle]
+pub fn free_1(ptr: *mut u8, len: usize) {
+    let data = unsafe { Vec::from_raw_parts(ptr, len, len) };
+    std::mem::drop(data);
+}
+
+#[no_mangle]
+pub fn malloc_2(len: usize) -> *mut u8 {
+    let align = std::mem::align_of::<usize>();
+    let layout = unsafe { std::alloc::Layout::from_size_align_unchecked(len, align) };
+    unsafe { std::alloc::alloc(layout) }
+}
+
+#[no_mangle]
+pub fn free_2(ptr: *mut u8, len: usize) {
+    let align = std::mem::align_of::<usize>();
+    let layout = unsafe { std::alloc::Layout::from_size_align_unchecked(len, align) };
+    unsafe { std::alloc::dealloc(ptr, layout) }
+}
+
+fn main() {
+    println!("Malloc-1");
+    let p = malloc_1(1024);
+    println!("Free-1");
+    free_1(p, 1024);
+
+    println!("Malloc-2");
+    let p = malloc_2(1024);
+    println!("Free-2");
+    free_2(p, 1024);
+}