feat: Add simple Dump creation and recovery.

Memory Dump functionality that can restore the previous VM state.

It dumps *global* variables, the only ones defining the program state.

The dump depends on the program itself, and on the index system, which right now is defined by the variable order.

Signed-off-by: Antonio Navarro Perez <antnavper@gmail.com>

1 files changed, 48 insertions, 0 deletions

diff --git a/parser/dump_test.go b/parser/dump_test.go
new file mode 100644
index 0000000..db86c48
--- /dev/null
+++ b/parser/dump_test.go
@@ -0,0 +1,48 @@
+package parser_test
+
+import (
+	"testing"
+
+	"github.com/mvertes/parscan/parser"
+)
+
+func TestDump(t *testing.T) {
+	initProgram := "var a int = 2+1; a"
+	interp := parser.NewInterpreter(GoScanner)
+	r, e := interp.Eval(initProgram)
+	t.Log(r, e)
+	if e != nil {
+		t.Fatal(e)
+	}
+
+	r, e = interp.Eval("a = 100")
+	t.Log(r, e)
+	if e != nil {
+		t.Fatal(e)
+	}
+
+	d := interp.Dump()
+	t.Log(d)
+
+	interp = parser.NewInterpreter(GoScanner)
+	r, e = interp.Eval(initProgram)
+	t.Log(r, e)
+	if e != nil {
+		t.Fatal(e)
+	}
+
+	e = interp.ApplyDump(d)
+	if e != nil {
+		t.Fatal(e)
+	}
+
+	r, e = interp.Eval("a = a + 1;a")
+	t.Log(r, e)
+	if e != nil {
+		t.Fatal(e)
+	}
+
+	if r.Interface() != int(101) {
+		t.Fatalf("unexpected result: %v", r)
+	}
+}