wasm: Implement `@wasmMemoryGrow` builtin

Similarly to the other wasm builtin, this implements the grow variation where the memory
index is a comptime known value. The operand as well as the result are runtime values.
This also verifies during semantic analysis the target we're building for is wasm, or else
emits a compilation error. This means that other backends do not have to handle this AIR instruction,
other than the wasm and LLVM backends.

1 files changed, 6 insertions, 1 deletions

diff --git a/src/codegen/llvm.zig b/src/codegen/llvm.zig
index a22d8e01b0..3e1be05d55 100644
--- a/src/codegen/llvm.zig
+++ b/src/codegen/llvm.zig
@@ -3478,7 +3478,12 @@ pub const FuncGen = struct {
 
     fn airWasmMemorySize(self: *FuncGen, inst: Air.Inst.Index) !?*const llvm.Value {
         _ = inst;
-        return self.todo("`@wasmMemorySize()`", .{});
+        return self.todo("implement builtin `@wasmMemorySize()`", .{});
+    }
+
+    fn airWasmMemoryGrow(self: *FuncGen, inst: Air.Inst.Index) !?*const llvm.Value {
+        _ = inst;
+        return self.todo("implement builtin `@wasmMemoryGrow()`", .{});
     }
 
     fn airMin(self: *FuncGen, inst: Air.Inst.Index) !?*const llvm.Value {