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Diffstat (limited to 'wasm2c/examples/callback/callback.wat')
| -rw-r--r-- | wasm2c/examples/callback/callback.wat | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/wasm2c/examples/callback/callback.wat b/wasm2c/examples/callback/callback.wat new file mode 100644 index 00000000..6a8ab233 --- /dev/null +++ b/wasm2c/examples/callback/callback.wat @@ -0,0 +1,19 @@ +;; Module demonstrating use of a host-installed callback function. + +;; The type of the callback function. The type ID can be looked up outside the module by calling +;; Z_[modname]_get_func_type(1, 0, WASM_RT_I32) (indicating 1 param, 0 results, param type is i32). +(type $print_type (func (param i32))) + +;; An indirect function table to hold the callback function +(table $table 1 funcref) + +;; A memory holding the string to be printed +(memory (export "memory") (data "Hello, world.\00")) + +;; Allow the host to set the callback function +(func (export "set_print_function") (param funcref) + (table.set $table (i32.const 0) (local.get 0))) + +;; Call the callback function with the location of "Hello, world." +(func (export "say_hello") + (call_indirect (type $print_type) (i32.const 0) (i32.const 0))) |