fix(generate): handle invalid signal name for metadata

Author: christka1

internal/generate/compile.go

@@ -189,6 +189,7 @@ func (c *compiler) addMetadata() {
 				sig, ok := c.db.Signal(def.MessageID.ToCAN(), string(def.SignalName))
 				if !ok {
 					c.addWarning(&compileError{def: def, reason: "no declared signal"})
+					continue
 				}
 				if def.AttributeName == "GenSigStartValue" {
 					sig.DefaultValue = int(def.IntValue)

internal/generate/compile_test.go

@@ -403,3 +403,17 @@ func Test_CopyFrom_PreservesOutOfRangeValues(t *testing.T) {
 		t.Errorf("Expected frames of messages to be identical (%v != %v)", m2.Frame(), original.Frame())
 	}
 }
+
+func TestCompile_MetadataInvalidSignalReference(t *testing.T) {
+	finish := runTestInDir(t, "../..")
+	defer finish()
+	const exampleDBCFile = "testdata/dbc-invalid/example/example_metadata_invalid_signal_reference.dbc"
+	input, err := os.ReadFile(exampleDBCFile)
+	assert.NilError(t, err)
+	result, err := Compile(exampleDBCFile, input)
+	if err != nil {
+		t.Fatal(err)
+	}
+	// We expect one warning for incorrect signal length in declaration of float32 signal
+	assert.Equal(t, len(result.Warnings), 1)
+}

testdata/dbc-invalid/example/example_metadata_invalid_signal_reference.dbc

@@ -0,0 +1,14 @@
+VERSION ""
+
+NS_ :
+
+BS_:
+
+BU_: DBG IO
+
+BO_ 42 AMessage: 8 Vector__XXX
+ SG_ ASignal : 7|16@0- (1,0) [-32768|32767] "%" Vector__XXX
+
+BA_DEF_ SG_  "GenSigStartValue" FLOAT -3.4E+038 3.4E+038;
+BA_DEF_DEF_  "GenSigStartValue" 0;
+BA_ "GenSigStartValue" SG_ 42 AnotherSignalName 0;