Fix jump offsets

antonmedv · antonmedv · commit c78443ac97a0 · 2022-10-25T23:15:05.000+02:00
diff --git a/compiler/compiler.go b/compiler/compiler.go
@@ -121,12 +121,12 @@ func (c *compiler) addConstant(constant interface{}) int {
 }
 
 func (c *compiler) patchJump(placeholder int) {
-	offset := len(c.bytecode) - 1 - placeholder
+	offset := len(c.bytecode) - placeholder
 	c.arguments[placeholder-1] = offset
 }
 
 func (c *compiler) calcBackwardJump(to int) int {
-	return len(c.bytecode) - 1 - to
+	return len(c.bytecode) + 1 - to
 }
 
 func (c *compiler) compile(node ast.Node) {

Original file line number	Diff line number	Diff line change
`@@ -121,12 +121,12 @@ func (c *compiler) addConstant(constant interface{}) int {`
`121`	`121`	`}`
`122`	`122`
`123`	`123`	`func (c *compiler) patchJump(placeholder int) {`
`124`		`- offset := len(c.bytecode) - 1 - placeholder`
	`124`	`+ offset := len(c.bytecode) - placeholder`
`125`	`125`	`c.arguments[placeholder-1] = offset`
`126`	`126`	`}`
`127`	`127`
`128`	`128`	`func (c *compiler) calcBackwardJump(to int) int {`
`129`		`- return len(c.bytecode) - 1 - to`
	`129`	`+ return len(c.bytecode) + 1 - to`
`130`	`130`	`}`
`131`	`131`
`132`	`132`	`func (c *compiler) compile(node ast.Node) {`