mirror of
https://github.com/golang/go
synced 2024-11-19 09:24:39 -07:00
8bb20b8231
Support for:
(*reflect.rtype).Field
(*reflect.rtype).FieldByName
reflect.MakeSlice
runtime.SetFinalizer
Details:
- analysis locates ssa.Functions for (reflect.Value).Call
and runtime.SetFinalizer during startup to that it can
special-case them during genCall. ('Call' is forthcoming.)
- The callsite.targets mechanism is only used for dynamic
calls now. For static calls we call callEdge during constraint
generation; this is a minor optimisation.
- Static calls to SetFinalizer are inlined so that the call
appears to go direct to the finalizer. (We'll use the same
trick for (reflect.Value).Call.)
- runtime.FuncForPC: treat as a no-op.
- Fixed pointer_test to properly deal with expectations
that are multi-sets.
- Inlined rtypeMethodByNameConstraint.addMethod.
- More tests.
R=crawshaw
CC=golang-dev
https://golang.org/cl/14682045
50 lines
1.2 KiB
Go
50 lines
1.2 KiB
Go
// +build ignore
|
|
|
|
package main
|
|
|
|
import "reflect"
|
|
|
|
type A struct {
|
|
f *int
|
|
g interface{}
|
|
h bool
|
|
}
|
|
|
|
var dyn string
|
|
|
|
func reflectTypeFieldByName() {
|
|
f, _ := reflect.TypeOf(A{}).FieldByName("f")
|
|
print(f.Type) // @pointsto *int
|
|
|
|
g, _ := reflect.TypeOf(A{}).FieldByName("g")
|
|
print(g.Type) // @pointsto interface{}
|
|
print(reflect.Zero(g.Type)) // @pointsto <alloc in reflect.Zero>
|
|
print(reflect.Zero(g.Type)) // @types interface{}
|
|
|
|
// TODO(adonovan): fix: the following should return a zero
|
|
// value of the empty interface (i.e. pts is empty), but that
|
|
// requires fixing the TODO comment in
|
|
// reflectZeroConstraint.solve, which in turn requires that we
|
|
// add a "settable" flag to tagged objects.
|
|
print(reflect.Zero(g.Type).Interface()) // @types interface{}
|
|
|
|
h, _ := reflect.TypeOf(A{}).FieldByName("h")
|
|
print(h.Type) // @pointsto bool
|
|
|
|
missing, _ := reflect.TypeOf(A{}).FieldByName("missing")
|
|
print(missing.Type) // @pointsto
|
|
|
|
dyn, _ := reflect.TypeOf(A{}).FieldByName(dyn)
|
|
print(dyn.Type) // @pointsto *int | bool | interface{}
|
|
}
|
|
|
|
func reflectTypeField() {
|
|
fld := reflect.TypeOf(A{}).Field(0)
|
|
print(fld.Type) // @pointsto *int | bool | interface{}
|
|
}
|
|
|
|
func main() {
|
|
reflectTypeFieldByName()
|
|
reflectTypeField()
|
|
}
|