interop: add Abort() function to ABORT things

Related to #2227.

pkg/compiler/analysis.go

@@ -17,7 +17,7 @@ var (
 	goBuiltins = []string{"len", "append", "panic", "make", "copy", "recover", "delete"}
 	// Custom builtin utility functions.
 	customBuiltins = []string{
-		"FromAddress", "Equals", "Remove",
+		"Abort", "FromAddress", "Equals", "Remove",
 		"ToBool", "ToBytes", "ToString", "ToInteger",
 	}
 )

pkg/compiler/codegen.go

@@ -1724,6 +1724,8 @@ func (c *codegen) convertBuiltin(expr *ast.CallExpr) {
 		c.emitStoreByIndex(varGlobal, c.exceptionIndex)
 	case "delete":
 		emit.Opcodes(c.prog.BinWriter, opcode.REMOVE)
+	case "Abort":
+		emit.Opcodes(c.prog.BinWriter, opcode.ABORT)
 	case "Remove":
 		if !isCompoundSlice(c.typeOf(expr.Args[0])) {
 			c.prog.Err = errors.New("`Remove` supports only non-byte slices")

pkg/compiler/interop_test.go

@@ -116,6 +116,18 @@ func TestFromAddress(t *testing.T) {
 	})
 }
 
+func TestAbort(t *testing.T) {
+	src := `package foo
+	import "github.com/nspcc-dev/neo-go/pkg/interop/util"
+	func Main() int {
+		util.Abort()
+		return 1
+	}`
+	v := vmAndCompile(t, src)
+	require.Error(t, v.Run())
+	require.True(t, v.HasFailed())
+}
+
 func spawnVM(t *testing.T, ic *interop.Context, src string) *vm.VM {
 	b, di, err := compiler.CompileWithDebugInfo("foo.go", strings.NewReader(src))
 	require.NoError(t, err)

pkg/interop/neogointernal/opcode.go

@@ -1,5 +1,10 @@
 package neogointernal
 
+// Opcode0 emits opcode without arguments.
+func Opcode0(op string) interface{} {
+	return nil
+}
+
 // Opcode1 emits opcode with 1 argument.
 func Opcode1(op string, arg interface{}) interface{} {
 	return nil

pkg/interop/util/util.go

@@ -3,7 +3,16 @@ Package util contains some special useful functions that are provided by compile
 */
 package util
 
-import "github.com/nspcc-dev/neo-go/pkg/interop"
+import (
+	"github.com/nspcc-dev/neo-go/pkg/interop"
+	"github.com/nspcc-dev/neo-go/pkg/interop/neogointernal"
+)
+
+// Abort terminates current execution, unlike exception throwing with panic() it
+// can't be recovered from.
+func Abort() {
+	_ = neogointernal.Opcode0("ABORT")
+}
 
 // FromAddress is an utility function that converts a Neo address to its hash
 // (160 bit BE value in a 20 byte slice). It can only be used for strings known