45ff2fe12f
This prepares for exposing operations like Memory.Grow while keeping the ability to trace what did that, by adding a `context.Context` initial parameter. This adds this to all API methods that mutate or return mutated data. Before, we made a change to trace functions and general lifecycle commands, but we missed this part. Ex. We track functions, but can't track what closed the module, changed memory or a mutable constant. Changing to do this now is not only more consistent, but helps us optimize at least the interpreter to help users identify otherwise opaque code that can cause harm. This is critical before we add more functions that can cause harm, such as Memory.Grow. Signed-off-by: Adrian Cole <adrian@tetrate.io>
74 lines
1.7 KiB
Go
74 lines
1.7 KiB
Go
package add
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import (
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"context"
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_ "embed"
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"fmt"
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"log"
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"os"
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"strconv"
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"github.com/tetratelabs/wazero"
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"github.com/tetratelabs/wazero/api"
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)
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// main implements a basic function in both Go and WebAssembly.
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func main() {
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// Choose the context to use for function calls.
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ctx := context.Background()
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// Create a new WebAssembly Runtime.
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r := wazero.NewRuntime()
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// Add a module to the runtime named "wasm/math" which exports one function "add", implemented in WebAssembly.
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wasm, err := r.InstantiateModuleFromCode(ctx, []byte(`(module $wasm/math
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(func $add (param i32 i32) (result i32)
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local.get 0
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local.get 1
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i32.add
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)
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(export "add" (func $add))
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)`))
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if err != nil {
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log.Fatal(err)
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}
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defer wasm.Close(ctx)
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// Add a module to the runtime named "host/math" which exports one function "add", implemented in Go.
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host, err := r.NewModuleBuilder("host/math").
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ExportFunction("add", func(v1, v2 uint32) uint32 {
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return v1 + v2
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}).Instantiate(ctx)
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if err != nil {
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log.Fatal(err)
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}
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defer host.Close(ctx)
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// Read two args to add.
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x, y := readTwoArgs()
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// Call the same function in both modules and print the results to the console.
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for _, mod := range []api.Module{wasm, host} {
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add := mod.ExportedFunction("add")
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results, err := add.Call(ctx, x, y)
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if err != nil {
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log.Fatal(err)
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}
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fmt.Printf("%s: %d + %d = %d\n", mod.Name(), x, y, results[0])
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}
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}
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func readTwoArgs() (uint64, uint64) {
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x, err := strconv.ParseUint(os.Args[1], 10, 64)
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if err != nil {
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log.Fatalf("invalid arg %v: %v", os.Args[1], err)
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}
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y, err := strconv.ParseUint(os.Args[2], 10, 64)
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if err != nil {
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log.Fatalf("invalid arg %v: %v", os.Args[2], err)
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}
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return x, y
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}
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