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compiler: emit default values in a generic way

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This commit is contained in:
Evgenii Stratonikov 2020-05-19 16:57:42 +03:00
parent 2cc58c3c9e
commit 582469028b
1 changed files with 13 additions and 16 deletions
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27
pkg/compiler/codegen.go
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@ -216,13 +216,9 @@ func (c *codegen) emitStoreVar(name string) {
}
}
func (c *codegen) emitDefault(n ast.Expr) {
tv, ok := c.typeInfo.Types[n]
if !ok {
c.prog.Err = errors.New("invalid type")
return
}
if t, ok := tv.Type.(*types.Basic); ok {
func (c *codegen) emitDefault(t types.Type) {
switch t := t.Underlying().(type) {
case *types.Basic:
info := t.Info()
switch {
case info&types.IsInteger != 0:
@ -234,9 +230,16 @@ func (c *codegen) emitDefault(n ast.Expr) {
default:
emit.Opcode(c.prog.BinWriter, opcode.PUSHNULL)
}
return
case *types.Slice:
if isCompoundSlice(t) {
emit.Opcode(c.prog.BinWriter, opcode.NEWARRAY0)
}
case *types.Struct:
emit.Int(c.prog.BinWriter, int64(t.NumFields()))
emit.Opcode(c.prog.BinWriter, opcode.NEWSTRUCT)
default:
emit.Opcode(c.prog.BinWriter, opcode.PUSHNULL)
}
}
// convertGlobals traverses the AST and only converts global declarations.
@ -363,14 +366,8 @@ func (c *codegen) Visit(node ast.Node) ast.Visitor {
for i := range t.Names {
if len(t.Values) != 0 {
ast.Walk(c, t.Values[i])
} else if typ := c.typeOf(t.Type); isCompoundSlice(typ) {
emit.Opcode(c.prog.BinWriter, opcode.PUSH0)
emit.Opcode(c.prog.BinWriter, opcode.NEWARRAY)
} else if s, ok := typ.Underlying().(*types.Struct); ok {
emit.Int(c.prog.BinWriter, int64(s.NumFields()))
emit.Opcode(c.prog.BinWriter, opcode.NEWSTRUCT)
} else {
c.emitDefault(t.Type)
c.emitDefault(c.typeOf(t.Type))
}
c.emitStoreVar(t.Names[i].Name)
}