CompiledModule: export Custom Sections (#1048)

Signed-off-by: Edoardo Vacchi <evacchi@users.noreply.github.com>
Co-authored-by: Takeshi Yoneda <t.y.mathetake@gmail.com>

config_example_test.go

@@ -0,0 +1,43 @@
+package wazero_test
+
+import (
+	"context"
+	_ "embed"
+	"log"
+
+	"github.com/tetratelabs/wazero"
+	"github.com/tetratelabs/wazero/api"
+)
+
+// This is a basic example of retrieving custom sections using RuntimeConfig.WithCustomSections.
+func Example_runtimeConfig_WithCustomSections() {
+	ctx := context.Background()
+	config := wazero.NewRuntimeConfig().WithCustomSections(true)
+
+	r := wazero.NewRuntimeWithConfig(ctx, config)
+	defer r.Close(ctx)
+
+	m, err := r.CompileModule(ctx, addWasm)
+	if err != nil {
+		log.Panicln(err)
+	}
+
+	if m.CustomSections() == nil {
+		log.Panicln("Custom sections should not be nil")
+	}
+
+	mustContain(m.CustomSections(), "producers")
+	mustContain(m.CustomSections(), "target_features")
+
+	// Output:
+	//
+}
+
+func mustContain(ss []api.CustomSection, name string) {
+	for _, s := range ss {
+		if s.Name() == name {
+			return
+		}
+	}
+	log.Panicf("Could not find section named %s\n", name)
+}