func visitField(instr *ssa.Field, infer *TypeInfer, ctx *Context) {
field, struc, index := instr, instr.X, instr.Field
if sType, ok := struc.Type().Underlying().(*types.Struct); ok {
sInst, ok := ctx.F.locals[struc]
if !ok {
infer.Logger.Fatalf("field: %s :%+v", ErrUnknownValue, struc)
return
}
fields, ok := ctx.F.structs[sInst]
if !ok {
fields, ok = ctx.F.Prog.structs[sInst]
if !ok {
infer.Logger.Fatalf("field: %s: struct uninitialised %+v", ErrUnknownValue, sInst)
return
}
}
infer.Logger.Print(ctx.F.Sprintf(ValSymbol+"%s = %s"+FieldSymbol+"{%d} of type %s", instr.Name(), sInst, index, sType.String()))
if fields[index] != nil {
infer.Logger.Print(ctx.F.Sprintf(SubSymbol+"accessed as %s", fields[index]))
} else {
fields[index] = &Value{field, ctx.F.InstanceID(), ctx.L.Index}
infer.Logger.Print(ctx.F.Sprintf(SubSymbol+"field uninitialised, set to %s", field.Name()))
}
initNestedRefVar(infer, ctx, ctx.F.locals[field], false)
ctx.F.locals[field] = fields[index]
return
}
infer.Logger.Fatalf("field: %s: field is not struct: %+v", ErrInvalidVarRead, struc)
}
func visitField(inst *ssa.Field, fr *frame) {
field := inst
struc := inst.X
index := inst.Field
if stype, ok := struc.Type().Underlying().(*types.Struct); ok {
switch vd, kind := fr.get(struc); kind {
case Struct:
fmt.Fprintf(os.Stderr, " %s = %s(=%s).[%d] of type %s\n", cyan(reg(field)), struc.Name(), vd.String(), index, field.Type().String())
if fr.env.structs[vd][index] == nil { // First use
vdField := utils.NewDef(field)
fr.env.structs[vd][index] = vdField
fmt.Fprintf(os.Stderr, " ^ accessed for the first time: use %s as field definition\n", field.Name())
// If field is struct
if fieldType, ok := field.Type().Underlying().(*types.Struct); ok {
fr.env.structs[vdField] = make(Fields, fieldType.NumFields())
fmt.Fprintf(os.Stderr, " ^ field %s is a struct (allocating)\n", field.Name())
}
} else if fr.env.structs[vd][index].Var != field { // Previously defined
fmt.Fprintf(os.Stderr, " ^ field %s previously defined as %s\n", field.Name(), reg(fr.env.structs[vd][index].Var))
} // else Accessed before (and unchanged)
fr.locals[field] = fr.env.structs[vd][index]
case LocalStruct:
fmt.Fprintf(os.Stderr, " %s = %s(=%s).[%d] (local) of type %s\n", cyan(reg(field)), struc.Name(), vd.String(), index, field.Type().String())
if fr.structs[vd][index] == nil { // First use
vdField := utils.NewDef(field)
fr.structs[vd][index] = vdField
fmt.Fprintf(os.Stderr, " ^ accessed for the first time: use %s as field definition\n", field.Name())
// If field is struct
if fieldType, ok := field.Type().Underlying().(*types.Struct); ok {
fr.structs[vdField] = make(Fields, fieldType.NumFields())
fmt.Fprintf(os.Stderr, " ^ field %s is a struct (allocating locally)\n", field.Name())
}
} else if fr.structs[vd][index].Var != field { // Previously defined
fmt.Fprintf(os.Stderr, " ^ field %s previously defined as %s\n", field.Name(), reg(fr.structs[vd][index].Var))
} // else Accessed before (and unchanged)
fr.locals[field] = fr.structs[vd][index]
case Nothing, Untracked:
// Nothing: Very likely external struct.
// Untracked: likely branches of return values (e.g. returning nil)
fmt.Fprintf(os.Stderr, " %s = %s(=%s).[%d] (external) of type %s\n", cyan(reg(field)), inst.X.Name(), vd.String(), index, field.Type().String())
vd := utils.NewDef(struc) // New external struct
fr.locals[struc] = vd
fr.env.structs[vd] = make(Fields, stype.NumFields())
vdField := utils.NewDef(field) // New external field
fr.env.structs[vd][index] = vdField
fr.locals[field] = vdField
fmt.Fprintf(os.Stderr, " ^ accessed for the first time: use %s as field definition of type %s\n", field.Name(), inst.Type().Underlying().String())
// If field is struct
if fieldType, ok := field.Type().Underlying().(*types.Struct); ok {
fr.env.structs[vdField] = make(Fields, fieldType.NumFields())
fmt.Fprintf(os.Stderr, " ^ field %s previously defined as %s\n", field.Name(), reg(fr.env.structs[vd][index].Var))
}
default:
panic(fmt.Sprintf("Field: Cannot access non-struct %s %T %d", reg(struc), struc.Type(), kind))
}
} else {
panic(fmt.Sprintf("Field: Cannot access field - %s not a struct\n", reg(struc)))
}
}