1 files changed, 44 insertions, 0 deletions
diff --git a/src/exports.zig b/src/exports.zig
new file mode 100644
index 000000000..cf37e8a38
--- /dev/null
+++ b/src/exports.zig
@@ -0,0 +1,44 @@
+const std = @import("std");
+const alloc = @import("alloc.zig");
+usingnamespace @import("global.zig");
+
+const Root = @import("main_wasm.zig").Root;
+
+pub extern fn init() void {
+    alloc.dynamic = std.heap.c_allocator;
+    alloc.static = std.heap.c_allocator;
+}
+
+/// Convert a slice into known memory representation -- enables C ABI
+pub const U8Chunk = packed struct {
+    const Float = @Type(builtin.TypeInfo{ .Float = .{ .bits = 2 * @bitSizeOf(usize) } });
+    const Abi = if (builtin.arch.isWasm()) Float else U8Chunk;
+
+    ptr: [*]u8,
+    len: usize,
+
+    pub fn toSlice(raw: Abi) []u8 {
+        const self = @bitCast(U8Chunk, raw);
+        return self.ptr[0..self.len];
+    }
+
+    pub fn fromSlice(slice: []u8) Abi {
+        const self = U8Chunk{ .ptr = slice.ptr, .len = slice.len };
+        return @bitCast(Abi, self);
+    }
+
+    pub fn empty() Abi {
+        return U8Chunk.fromSlice(&[0]u8{});
+    }
+};
+
+export fn fd_create() ?*Root {
+    const fd = allocator.create(Root) catch return null;
+    fd.* = .{};
+    return fd;
+}
+
+export fn fd_destroy(fd: *Root) void {
+    fd.deinit(allocator);
+    allocator.destroy(fd);
+}