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Fixed bug in else stmts (CityOfZion/neo-storm#42)

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* Fixed bug in else stmts

* Fixed if else bug

* Back to %v for formatting instructions

Imported from CityOfZion/neo-storm (ea8440e1454207753c8d209ce7c2cf724fd4ea16).
This commit is contained in:
Anthony De Meulemeester 2018-10-20 07:11:00 +02:00 committed by Roman Khimov
parent b97e5aafec
commit 0880e88fa5
2 changed files with 11 additions and 10 deletions
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3
cli/smartcontract/smart_contract.go
View file

@ -173,8 +173,7 @@ func testInvoke(ctx *cli.Context) error {
// On the long term the internal VM will run the script.
// TODO: remove RPC dependency, hardcoded node.
endpoint := "http://seed5.bridgeprotocol.io:10332"
opts := rpc.ClientOptions{}
client, err := rpc.NewClient(context.TODO(), endpoint, opts)
client, err := rpc.NewClient(context.TODO(), endpoint, rpc.ClientOptions{})
if err != nil {
return cli.NewExitError(err, 1)
}

18
pkg/vm/compiler/codegen.go
View file

@ -257,11 +257,7 @@ func (c *codegen) Visit(node ast.Node) ast.Visitor {
log.Fatal("multiple returns not supported.")
}
// @OPTIMIZE: We could skip these 3 instructions for each return statement.
// To be backwards compatible we will put them them in.
// See issue #65 (https://github.com/CityOfZion/neo-go/issues/65)
l := c.newLabel()
// emitJmp(c.prog, vm.JMP, int16(l))
c.setLabel(l)
if len(n.Results) > 0 {
@ -276,6 +272,8 @@ func (c *codegen) Visit(node ast.Node) ast.Visitor {
case *ast.IfStmt:
lIf := c.newLabel()
lElse := c.newLabel()
lElseEnd := c.newLabel()
if n.Cond != nil {
ast.Walk(c, n.Cond)
emitJmp(c.prog, vm.JMPIFNOT, int16(lElse))
@ -283,15 +281,15 @@ func (c *codegen) Visit(node ast.Node) ast.Visitor {
c.setLabel(lIf)
ast.Walk(c, n.Body)
if n.Else != nil {
// TODO: handle else statements.
// emitJmp(c.prog, vm.JMP, int16(lEnd))
emitJmp(c.prog, vm.JMP, int16(lElseEnd))
}
c.setLabel(lElse)
if n.Else != nil {
ast.Walk(c, n.Else)
}
c.setLabel(lElseEnd)
return nil
case *ast.BasicLit:
@ -659,7 +657,11 @@ func (c *codegen) convertToken(tok token.Token) {
case token.GEQ:
emitOpcode(c.prog, vm.GTE)
case token.EQL:
emitOpcode(c.prog, vm.NUMEQUAL)
// It seems that (looking to the python compiler) that comparing for
// equal (==) needs to return the instruction EQUAL. Where comparing
// (anything) to not equal (!=) needs to use the opcode NUMNOTEQUAL
// even for comparing strings.
emitOpcode(c.prog, vm.EQUAL)
case token.NEQ:
emitOpcode(c.prog, vm.NUMNOTEQUAL)
case token.DEC: