compiler(amd64),interpreter: signed-extend to 32-bit in V128ExtractLane. (#695)

Signed-off-by: Takeshi Yoneda <takeshi@tetrate.io>

internal/integration_test/fuzzcases/README.md

@@ -0,0 +1,2 @@
+Here we collect the test cases found by [wazero-fuzz](https://github.com/tetratelabs/wazero-fuzz).
+The test data in `./testdata` directory is named as `12345.wat` where the numebr corresponds to the PR or issue in this repostiroy.

internal/integration_test/fuzzcases/fuzzcases_test.go

@@ -0,0 +1,54 @@
+package fuzzcases
+
+import (
+	"context"
+	_ "embed"
+	"testing"
+
+	"github.com/tetratelabs/wazero"
+	"github.com/tetratelabs/wazero/internal/platform"
+	"github.com/tetratelabs/wazero/internal/testing/require"
+)
+
+var ctx = context.Background()
+
+var (
+	//go:embed testdata/695.wasm
+	case695 []byte
+)
+
+func newRuntimeCompiler() wazero.Runtime {
+	return wazero.NewRuntimeWithConfig(wazero.NewRuntimeConfigCompiler().WithWasmCore2())
+}
+
+func newRuntimeInterpreter() wazero.Runtime {
+	return wazero.NewRuntimeWithConfig(wazero.NewRuntimeConfigInterpreter().WithWasmCore2())
+}
+
+// Test695 requires two functions to exit with "out of bounds memory access" consistently across the implementations.
+func Test695(t *testing.T) {
+	if !platform.CompilerSupported() {
+		return
+	}
+
+	for _, tc := range []struct {
+		name string
+		r    wazero.Runtime
+	}{
+		{name: "compiler", r: newRuntimeCompiler()},
+		{name: "interpreter", r: newRuntimeInterpreter()},
+	} {
+		tc := tc
+		t.Run(tc.name, func(t *testing.T) {
+			defer tc.r.Close(ctx)
+			module, err := tc.r.InstantiateModuleFromBinary(ctx, case695)
+			require.NoError(t, err)
+
+			_, err = module.ExportedFunction("i8x16s").Call(ctx)
+			require.Contains(t, err.Error(), "out of bounds memory access")
+
+			_, err = module.ExportedFunction("i16x8s").Call(ctx)
+			require.Contains(t, err.Error(), "out of bounds memory access")
+		})
+	}
+}

internal/integration_test/fuzzcases/testdata/695.wat

@@ -0,0 +1,16 @@
+(module
+  (type (func))
+  (func (export "i8x16s") (type 0)
+    v128.const i8x16 0x0 0xff 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0
+    i8x16.extract_lane_s 1 ;; uint32(int8(0xff)) = 0xffff_ffff
+     ;; if the signed extend is 64-bit, then the offset 0xffff_ffff_ffff_ffff + 1= 0 and not result in out of bounds.
+    v128.load32_zero offset=1 align=1
+    unreachable)
+  (func (export "i16x8s") (type 0)
+    v128.const i16x8 0x0 0xffff 0x0 0x0 0x0 0x0 0x0 0x0
+    i16x8.extract_lane_s 1 ;; uint32(int16(0xffff)) = 0xffff_ffff
+     ;; if the signed extend is 64-bit, then the offset 0xffff_ffff_ffff_ffff + 1= 0 and not result in out of bounds.
+    v128.load32_zero offset=1 align=1
+    unreachable)
+  (memory 1 1)
+)