proc/tests: testing apparatus for complex location expressions

pkg/dwarf/dwarfbuilder/loc.go

@@ -0,0 +1,34 @@
+package dwarfbuilder
+
+import (
+	"bytes"
+
+	"github.com/derekparker/delve/pkg/dwarf/op"
+	"github.com/derekparker/delve/pkg/dwarf/util"
+)
+
+// LocEntry represents one entry of debug_loc.
+type LocEntry struct {
+	Lowpc  uint64
+	Highpc uint64
+	Loc    []byte
+}
+
+// LocationBlock returns a DWARF expression corresponding to the list of
+// arguments.
+func LocationBlock(args ...interface{}) []byte {
+	var buf bytes.Buffer
+	for _, arg := range args {
+		switch x := arg.(type) {
+		case op.Opcode:
+			buf.WriteByte(byte(x))
+		case int:
+			util.EncodeSLEB128(&buf, int64(x))
+		case uint:
+			util.EncodeULEB128(&buf, uint64(x))
+		default:
+			panic("unsupported value type")
+		}
+	}
+	return buf.Bytes()
+}