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compiler: support initializing struct fields from a variable

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While initializing a struct, it is a top item on ALTSTACK.
This means that if we need to load a local variable,
DUPFROMALTSTACK won't longer push an array of locals on stack
but rather a currently initializing struct.

Closes #656.
This commit is contained in:
Evgenii Stratonikov 2020-02-11 11:10:51 +03:00
parent bcff9faac4
commit ae03560589
2 changed files with 76 additions and 5 deletions
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16
pkg/compiler/codegen.go
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@ -872,7 +872,6 @@ func (c *codegen) convertStruct(lit *ast.CompositeLit) {
emit.Opcode(c.prog.BinWriter, opcode.NOP)
emit.Int(c.prog.BinWriter, int64(strct.NumFields()))
emit.Opcode(c.prog.BinWriter, opcode.NEWSTRUCT)
emit.Opcode(c.prog.BinWriter, opcode.TOALTSTACK)
// We need to locally store all the fields, even if they are not initialized.
// We will initialize all fields to their "zero" value.
@ -886,9 +885,14 @@ func (c *codegen) convertStruct(lit *ast.CompositeLit) {
fieldName := f.Key.(*ast.Ident).Name
if sField.Name() == fieldName {
ast.Walk(c, f.Value)
emit.Opcode(c.prog.BinWriter, opcode.DUP)
pos := indexOfStruct(strct, fieldName)
c.emitStoreLocal(pos)
emit.Int(c.prog.BinWriter, int64(pos))
ast.Walk(c, f.Value)
emit.Opcode(c.prog.BinWriter, opcode.SETITEM)
fieldAdded = true
break
}
@ -902,10 +906,12 @@ func (c *codegen) convertStruct(lit *ast.CompositeLit) {
c.prog.Err = err
return
}
emit.Opcode(c.prog.BinWriter, opcode.DUP)
emit.Int(c.prog.BinWriter, int64(i))
c.emitLoadConst(typeAndVal)
c.emitStoreLocal(i)
emit.Opcode(c.prog.BinWriter, opcode.SETITEM)
}
emit.Opcode(c.prog.BinWriter, opcode.FROMALTSTACK)
}
func (c *codegen) convertToken(tok token.Token) {