wasi preview 2 support (#4027)

* all: wasip2 support

Co-authored-by: Randy Reddig <randy.reddig@fastly.com>

src/internal/wasi/filesystem/v0.2.0/preopens/empty.s

@@ -0,0 +1,3 @@
+// This file exists for testing this package without WebAssembly,
+// allowing empty function bodies with a //go:wasmimport directive.
+// See https://pkg.go.dev/cmd/compile for more information.

src/internal/wasi/filesystem/v0.2.0/preopens/preopens.wit.go

@@ -0,0 +1,27 @@
+// Code generated by wit-bindgen-go. DO NOT EDIT.
+
+//go:build !wasip1
+
+// Package preopens represents the imported interface "wasi:filesystem/preopens@0.2.0".
+package preopens
+
+import (
+	"github.com/ydnar/wasm-tools-go/cm"
+	"internal/wasi/filesystem/v0.2.0/types"
+)
+
+// GetDirectories represents the imported function "get-directories".
+//
+// Return the set of preopened directories, and their path.
+//
+//	get-directories: func() -> list<tuple<descriptor, string>>
+//
+//go:nosplit
+func GetDirectories() (result cm.List[cm.Tuple[types.Descriptor, string]]) {
+	wasmimport_GetDirectories(&result)
+	return
+}
+
+//go:wasmimport wasi:filesystem/preopens@0.2.0 get-directories
+//go:noescape
+func wasmimport_GetDirectories(result *cm.List[cm.Tuple[types.Descriptor, string]])

src/internal/wasi/filesystem/v0.2.0/types/abi.go

@@ -0,0 +1,27 @@
+// Code generated by wit-bindgen-go. DO NOT EDIT.
+
+//go:build !wasip1
+
+package types
+
+import (
+	"github.com/ydnar/wasm-tools-go/cm"
+	wallclock "internal/wasi/clocks/v0.2.0/wall-clock"
+)
+
+func lower_DateTime(v wallclock.DateTime) (f0 uint64, f1 uint32) {
+	f0 = (uint64)(v.Seconds)
+	f1 = (uint32)(v.Nanoseconds)
+	return
+}
+
+func lower_NewTimestamp(v NewTimestamp) (f0 uint32, f1 uint64, f2 uint32) {
+	f0 = (uint32)(cm.Tag(&v))
+	switch f0 {
+	case 2: // timestamp
+		v1, v2 := lower_DateTime(*v.Timestamp())
+		f1 = (uint64)(v1)
+		f2 = (uint32)(v2)
+	}
+	return
+}

src/internal/wasi/filesystem/v0.2.0/types/empty.s

@@ -0,0 +1,3 @@
+// This file exists for testing this package without WebAssembly,
+// allowing empty function bodies with a //go:wasmimport directive.
+// See https://pkg.go.dev/cmd/compile for more information.