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compiler: support copy()

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This commit is contained in:
Evgenii Stratonikov 2020-08-24 12:54:01 +03:00
parent ab4cd8a990
commit 69989e1227
4 changed files with 115 additions and 4 deletions
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52
pkg/compiler/codegen.go
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@ -1295,6 +1295,44 @@ func (c *codegen) convertSyscall(expr *ast.CallExpr, api, name string) {
emit.Opcode(c.prog.BinWriter, opcode.NOP)
}
// emitSliceHelper emits 3 items on stack: slice, its first index, and its size.
func (c *codegen) emitSliceHelper(e ast.Expr) {
if !isByteSlice(c.typeOf(e)) {
c.prog.Err = fmt.Errorf("copy is supported only for byte-slices")
return
}
var hasLowIndex bool
switch src := e.(type) {
case *ast.SliceExpr:
ast.Walk(c, src.X)
if src.High != nil {
ast.Walk(c, src.High)
} else {
emit.Opcode(c.prog.BinWriter, opcode.DUP)
emit.Opcode(c.prog.BinWriter, opcode.SIZE)
}
if src.Low != nil {
ast.Walk(c, src.Low)
hasLowIndex = true
} else {
emit.Int(c.prog.BinWriter, 0)
}
default:
ast.Walk(c, src)
emit.Opcode(c.prog.BinWriter, opcode.DUP)
emit.Opcode(c.prog.BinWriter, opcode.SIZE)
emit.Int(c.prog.BinWriter, 0)
}
if !hasLowIndex {
emit.Opcode(c.prog.BinWriter, opcode.SWAP)
} else {
emit.Opcode(c.prog.BinWriter, opcode.DUP)
emit.Opcode(c.prog.BinWriter, opcode.ROT)
emit.Opcode(c.prog.BinWriter, opcode.SWAP)
emit.Opcode(c.prog.BinWriter, opcode.SUB)
}
}
func (c *codegen) convertBuiltin(expr *ast.CallExpr) {
var name string
switch t := expr.Fun.(type) {
@ -1305,6 +1343,14 @@ func (c *codegen) convertBuiltin(expr *ast.CallExpr) {
}
switch name {
case "copy":
// stack for MEMCPY is: dst, dst_index, src, src_index, count
c.emitSliceHelper(expr.Args[0])
c.emitSliceHelper(expr.Args[1])
emit.Int(c.prog.BinWriter, 3)
emit.Opcode(c.prog.BinWriter, opcode.ROLL)
emit.Opcode(c.prog.BinWriter, opcode.MIN)
emit.Opcode(c.prog.BinWriter, opcode.MEMCPY)
case "make":
typ := c.typeOf(expr.Args[0])
switch {
@ -1412,10 +1458,10 @@ func transformArgs(fun ast.Expr, args []ast.Expr) []ast.Expr {
return args[1:]
}
case *ast.Ident:
if f.Name == "panic" {
switch f.Name {
case "panic":
return args[1:]
}
if f.Name == "make" {
case "make", "copy":
return nil
}
}