Implemented length storage of allocated memory

src/core/CompileLen.go

@@ -0,0 +1,26 @@
+package core
+
+import (
+	"math"
+
+	"git.akyoto.dev/cli/q/src/asm"
+	"git.akyoto.dev/cli/q/src/expression"
+)
+
+// CompileLen returns the length of a slice.
+func (f *Function) CompileLen(root *expression.Expression) error {
+	_, register, isTemporary, err := f.Evaluate(root.Children[1])
+
+	if err != nil {
+		return err
+	}
+
+	f.SaveRegister(f.CPU.Output[0])
+	f.MemoryRegister(asm.LOAD, asm.Memory{Base: register, Offset: -8, OffsetRegister: math.MaxUint8, Length: 8}, f.CPU.Output[0])
+
+	if isTemporary {
+		f.FreeRegister(register)
+	}
+
+	return nil
+}