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vm,compiler: replace APPCALL with System.Contract.Call

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Contract calls are performed via syscall System.Contract.Call
in NEO3. This implements this in compiler and removes APPCALL from the
VM.
This commit is contained in:
Evgenii Stratonikov 2020-05-07 14:38:19 +03:00
parent ec900c7ff7
commit 73c82584a3
13 changed files with 108 additions and 241 deletions
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16
pkg/compiler/codegen.go
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@ -1080,16 +1080,12 @@ func (c *codegen) convertBuiltin(expr *ast.CallExpr) {
case "SHA256":
emit.Syscall(c.prog.BinWriter, "Neo.Crypto.SHA256")
case "AppCall":
numArgs := len(expr.Args) - 1
c.emitReverse(numArgs)
emit.Opcode(c.prog.BinWriter, opcode.APPCALL)
c.emitReverse(len(expr.Args))
buf := c.getByteArray(expr.Args[0])
if len(buf) != 20 {
c.prog.Err = errors.New("invalid script hash")
}
c.prog.WriteBytes(buf)
emit.Syscall(c.prog.BinWriter, "System.Contract.Call")
case "Equals":
emit.Opcode(c.prog.BinWriter, opcode.EQUAL)
case "FromAddress":
@ -1111,16 +1107,14 @@ func (c *codegen) convertBuiltin(expr *ast.CallExpr) {
// transformArgs returns a list of function arguments
// which should be put on stack.
// There are special cases for builtins:
// 1. When using AppCall, script hash is a part of the instruction so
// it should be emitted after APPCALL.
// 2. With FromAddress, parameter conversion is happening at compile-time
// 1. With FromAddress, parameter conversion is happening at compile-time
// so there is no need to push parameters on stack and perform an actual call
// 3. With panic, generated code depends on if argument was nil or a string so
// 2. With panic, generated code depends on if argument was nil or a string so
// it should be handled accordingly.
func transformArgs(fun ast.Expr, args []ast.Expr) []ast.Expr {
switch f := fun.(type) {
case *ast.SelectorExpr:
if f.Sel.Name == "AppCall" || f.Sel.Name == "FromAddress" {
if f.Sel.Name == "FromAddress" {
return args[1:]
}
case *ast.Ident: