mirror of
https://github.com/golang/go
synced 2024-11-19 07:04:43 -07:00
2299ac6bf3
This information can be used to specialize such calls, e.g. - report location of unsound calls (done for reflect.NewAt) - exploit argument information (done for constant 'dir' parameter to reflect.ChanOf) + tests. R=crawshaw CC=golang-dev https://golang.org/cl/14517046
911 lines
22 KiB
Go
911 lines
22 KiB
Go
package pointer
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// This file implements the generation and resolution rules for
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// constraints arising from the use of reflection in the target
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// program. See doc.go for explanation of the representation.
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//
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// For consistency, the names of all parameters match those of the
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// actual functions in the "reflect" package.
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//
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// TODO(adonovan): fix: most of the reflect API permits implicit
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// conversions due to assignability, e.g. m.MapIndex(k) is ok if T(k)
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// is assignable to T(M).key. It's not yet clear how best to model
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// that; perhaps a more lenient version of typeAssertConstraint is
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// needed.
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//
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// To avoid proliferation of equivalent labels, instrinsics should
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// memoize as much as possible, like TypeOf and Zero do for their
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// tagged objects.
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//
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// TODO(adonovan): all {} functions are TODO.
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import (
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"fmt"
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"go/ast"
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"reflect"
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"code.google.com/p/go.tools/go/exact"
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"code.google.com/p/go.tools/go/types"
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"code.google.com/p/go.tools/ssa"
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)
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// -------------------- (reflect.Value) --------------------
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func ext۰reflect۰Value۰Addr(a *analysis, cgn *cgnode) {}
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func ext۰reflect۰Value۰Bytes(a *analysis, cgn *cgnode) {}
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func ext۰reflect۰Value۰Call(a *analysis, cgn *cgnode) {}
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func ext۰reflect۰Value۰CallSlice(a *analysis, cgn *cgnode) {}
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func ext۰reflect۰Value۰Convert(a *analysis, cgn *cgnode) {}
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func ext۰reflect۰Value۰Elem(a *analysis, cgn *cgnode) {}
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func ext۰reflect۰Value۰Field(a *analysis, cgn *cgnode) {}
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func ext۰reflect۰Value۰FieldByIndex(a *analysis, cgn *cgnode) {}
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func ext۰reflect۰Value۰FieldByName(a *analysis, cgn *cgnode) {}
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func ext۰reflect۰Value۰FieldByNameFunc(a *analysis, cgn *cgnode) {}
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func ext۰reflect۰Value۰Index(a *analysis, cgn *cgnode) {}
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// ---------- func (Value).Interface() Value ----------
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// result = v.Interface()
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type rVInterfaceConstraint struct {
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v nodeid // (ptr)
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result nodeid
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}
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func (c *rVInterfaceConstraint) String() string {
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return fmt.Sprintf("n%d = reflect n%d.Interface()", c.result, c.v)
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}
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func (c *rVInterfaceConstraint) ptr() nodeid {
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return c.v
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}
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func (c *rVInterfaceConstraint) solve(a *analysis, _ *node, delta nodeset) {
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resultPts := &a.nodes[c.result].pts
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changed := false
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for vObj := range delta {
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tDyn, _, indirect := a.taggedValue(vObj)
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if tDyn == nil {
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panic("not a tagged object")
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}
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if indirect {
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// TODO(adonovan): we'll need to implement this
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// when we start creating indirect tagged objects.
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panic("indirect tagged object")
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}
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if resultPts.add(vObj) {
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changed = true
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}
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}
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if changed {
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a.addWork(c.result)
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}
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}
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func ext۰reflect۰Value۰Interface(a *analysis, cgn *cgnode) {
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a.addConstraint(&rVInterfaceConstraint{
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v: a.funcParams(cgn.obj),
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result: a.funcResults(cgn.obj),
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})
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}
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// ---------- func (Value).MapIndex(Value) Value ----------
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// result = v.MapIndex(_)
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type rVMapIndexConstraint struct {
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cgn *cgnode
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v nodeid // (ptr)
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result nodeid
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}
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func (c *rVMapIndexConstraint) String() string {
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return fmt.Sprintf("n%d = reflect n%d.MapIndex(_)", c.result, c.v)
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}
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func (c *rVMapIndexConstraint) ptr() nodeid {
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return c.v
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}
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func (c *rVMapIndexConstraint) solve(a *analysis, _ *node, delta nodeset) {
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changed := false
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for vObj := range delta {
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tDyn, m, indirect := a.taggedValue(vObj)
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tMap, _ := tDyn.Underlying().(*types.Map)
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if tMap == nil {
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continue // not a map
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}
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if indirect {
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// TODO(adonovan): we'll need to implement this
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// when we start creating indirect tagged objects.
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panic("indirect tagged object")
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}
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obj := a.makeTagged(tMap.Elem(), c.cgn, nil)
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a.load(obj+1, m, a.sizeof(tMap.Key()), a.sizeof(tMap.Elem()))
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if a.addLabel(c.result, obj) {
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changed = true
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}
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}
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if changed {
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a.addWork(c.result)
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}
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}
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func ext۰reflect۰Value۰MapIndex(a *analysis, cgn *cgnode) {
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a.addConstraint(&rVMapIndexConstraint{
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cgn: cgn,
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v: a.funcParams(cgn.obj),
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result: a.funcResults(cgn.obj),
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})
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}
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// ---------- func (Value).MapKeys() []Value ----------
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// result = v.MapKeys()
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type rVMapKeysConstraint struct {
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cgn *cgnode
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v nodeid // (ptr)
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result nodeid
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}
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func (c *rVMapKeysConstraint) String() string {
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return fmt.Sprintf("n%d = reflect n%d.MapKeys()", c.result, c.v)
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}
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func (c *rVMapKeysConstraint) ptr() nodeid {
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return c.v
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}
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func (c *rVMapKeysConstraint) solve(a *analysis, _ *node, delta nodeset) {
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changed := false
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for vObj := range delta {
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tDyn, m, indirect := a.taggedValue(vObj)
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tMap, _ := tDyn.Underlying().(*types.Map)
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if tMap == nil {
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continue // not a map
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}
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if indirect {
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// TODO(adonovan): we'll need to implement this
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// when we start creating indirect tagged objects.
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panic("indirect tagged object")
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}
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kObj := a.makeTagged(tMap.Key(), c.cgn, nil)
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a.load(kObj+1, m, 0, a.sizeof(tMap.Key()))
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if a.addLabel(c.result, kObj) {
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changed = true
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}
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}
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if changed {
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a.addWork(c.result)
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}
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}
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func ext۰reflect۰Value۰MapKeys(a *analysis, cgn *cgnode) {
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// Allocate an array for the result.
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obj := a.nextNode()
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a.addNodes(types.NewArray(a.reflectValueObj.Type(), 1), "reflect.MapKeys result")
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a.endObject(obj, cgn, nil)
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a.addressOf(a.funcResults(cgn.obj), obj)
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a.addConstraint(&rVMapKeysConstraint{
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cgn: cgn,
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v: a.funcParams(cgn.obj),
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result: obj + 1, // result is stored in array elems
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})
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}
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func ext۰reflect۰Value۰Method(a *analysis, cgn *cgnode) {}
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func ext۰reflect۰Value۰MethodByName(a *analysis, cgn *cgnode) {}
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// ---------- func (Value).Recv(Value) ----------
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// result, _ = v.Recv()
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type rVRecvConstraint struct {
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cgn *cgnode
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v nodeid // (ptr)
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result nodeid
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}
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func (c *rVRecvConstraint) String() string {
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return fmt.Sprintf("n%d = reflect n%d.Recv()", c.result, c.v)
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}
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func (c *rVRecvConstraint) ptr() nodeid {
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return c.v
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}
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func (c *rVRecvConstraint) solve(a *analysis, _ *node, delta nodeset) {
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changed := false
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for vObj := range delta {
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tDyn, ch, indirect := a.taggedValue(vObj)
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tChan, _ := tDyn.Underlying().(*types.Chan)
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if tChan == nil {
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continue // not a channel
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}
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if indirect {
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// TODO(adonovan): we'll need to implement this
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// when we start creating indirect tagged objects.
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panic("indirect tagged object")
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}
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tElem := tChan.Elem()
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elemObj := a.makeTagged(tElem, c.cgn, nil)
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a.load(elemObj+1, ch, 0, a.sizeof(tElem))
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if a.addLabel(c.result, elemObj) {
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changed = true
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}
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}
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if changed {
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a.addWork(c.result)
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}
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}
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func ext۰reflect۰Value۰Recv(a *analysis, cgn *cgnode) {
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a.addConstraint(&rVRecvConstraint{
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cgn: cgn,
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v: a.funcParams(cgn.obj),
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result: a.funcResults(cgn.obj),
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})
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}
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// ---------- func (Value).Send(Value) ----------
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// v.Send(x)
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type rVSendConstraint struct {
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cgn *cgnode
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v nodeid // (ptr)
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x nodeid
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}
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func (c *rVSendConstraint) String() string {
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return fmt.Sprintf("reflect n%d.Send(n%d)", c.v, c.x)
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}
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func (c *rVSendConstraint) ptr() nodeid {
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return c.v
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}
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func (c *rVSendConstraint) solve(a *analysis, _ *node, delta nodeset) {
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for vObj := range delta {
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tDyn, ch, indirect := a.taggedValue(vObj)
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tChan, _ := tDyn.Underlying().(*types.Chan)
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if tChan == nil {
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continue // not a channel
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}
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if indirect {
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// TODO(adonovan): we'll need to implement this
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// when we start creating indirect tagged objects.
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panic("indirect tagged object")
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}
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// Extract x's payload to xtmp, then store to channel.
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tElem := tChan.Elem()
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xtmp := a.addNodes(tElem, "Send.xtmp")
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a.typeAssert(tElem, xtmp, c.x)
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a.store(ch, xtmp, 0, a.sizeof(tElem))
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}
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}
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func ext۰reflect۰Value۰Send(a *analysis, cgn *cgnode) {
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params := a.funcParams(cgn.obj)
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a.addConstraint(&rVSendConstraint{
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cgn: cgn,
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v: params,
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x: params + 1,
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})
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}
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func ext۰reflect۰Value۰Set(a *analysis, cgn *cgnode) {}
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func ext۰reflect۰Value۰SetBytes(a *analysis, cgn *cgnode) {}
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// ---------- func (Value).SetMapIndex(k Value, v Value) ----------
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// v.SetMapIndex(key, val)
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type rVSetMapIndexConstraint struct {
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cgn *cgnode
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v nodeid // (ptr)
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key nodeid
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val nodeid
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}
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func (c *rVSetMapIndexConstraint) String() string {
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return fmt.Sprintf("reflect n%d.SetMapIndex(n%d, n%d)", c.v, c.key, c.val)
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}
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func (c *rVSetMapIndexConstraint) ptr() nodeid {
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return c.v
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}
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func (c *rVSetMapIndexConstraint) solve(a *analysis, _ *node, delta nodeset) {
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for vObj := range delta {
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tDyn, m, indirect := a.taggedValue(vObj)
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tMap, _ := tDyn.Underlying().(*types.Map)
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if tMap == nil {
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continue // not a map
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}
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if indirect {
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// TODO(adonovan): we'll need to implement this
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// when we start creating indirect tagged objects.
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panic("indirect tagged object")
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}
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keysize := a.sizeof(tMap.Key())
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// Extract key's payload to keytmp, then store to map key.
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keytmp := a.addNodes(tMap.Key(), "SetMapIndex.keytmp")
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a.typeAssert(tMap.Key(), keytmp, c.key)
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a.store(m, keytmp, 0, keysize)
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// Extract val's payload to vtmp, then store to map value.
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valtmp := a.addNodes(tMap.Elem(), "SetMapIndex.valtmp")
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a.typeAssert(tMap.Elem(), valtmp, c.val)
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a.store(m, valtmp, keysize, a.sizeof(tMap.Elem()))
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}
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}
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func ext۰reflect۰Value۰SetMapIndex(a *analysis, cgn *cgnode) {
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params := a.funcParams(cgn.obj)
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a.addConstraint(&rVSetMapIndexConstraint{
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cgn: cgn,
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v: params,
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key: params + 1,
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val: params + 2,
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})
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}
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func ext۰reflect۰Value۰SetPointer(a *analysis, cgn *cgnode) {}
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func ext۰reflect۰Value۰Slice(a *analysis, cgn *cgnode) {}
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// -------------------- Standalone reflect functions --------------------
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func ext۰reflect۰Append(a *analysis, cgn *cgnode) {}
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func ext۰reflect۰AppendSlice(a *analysis, cgn *cgnode) {}
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func ext۰reflect۰Copy(a *analysis, cgn *cgnode) {}
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// ---------- func ChanOf(ChanDir, Type) Type ----------
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// result = ChanOf(dir, t)
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type reflectChanOfConstraint struct {
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cgn *cgnode
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t nodeid // (ptr)
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result nodeid
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dirs []ast.ChanDir
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}
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func (c *reflectChanOfConstraint) String() string {
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return fmt.Sprintf("n%d = reflect.ChanOf(n%d)", c.result, c.t)
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}
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func (c *reflectChanOfConstraint) ptr() nodeid {
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return c.t
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}
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func (c *reflectChanOfConstraint) solve(a *analysis, _ *node, delta nodeset) {
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changed := false
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for tObj := range delta {
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T := a.rtypeTaggedValue(tObj)
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for _, dir := range c.dirs {
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if a.addLabel(c.result, a.makeRtype(types.NewChan(dir, T))) {
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changed = true
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}
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}
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}
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if changed {
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a.addWork(c.result)
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}
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}
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// dirMap maps reflect.ChanDir to the set of channel types generated by ChanOf.
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var dirMap = [...][]ast.ChanDir{
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0: {ast.RECV, ast.SEND, ast.RECV | ast.SEND}, // unknown
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reflect.RecvDir: {ast.RECV},
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reflect.SendDir: {ast.SEND},
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reflect.BothDir: {ast.RECV | ast.SEND},
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}
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func ext۰reflect۰ChanOf(a *analysis, cgn *cgnode) {
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// If we have access to the callsite,
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// and the channel argument is a constant (as is usual),
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// only generate the requested direction.
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var dir reflect.ChanDir // unknown
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if site := cgn.callersite; site != nil {
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if c, ok := site.instr.Common().Args[0].(*ssa.Const); ok {
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v, _ := exact.Int64Val(c.Value)
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if 0 <= v && v <= int64(reflect.BothDir) {
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dir = reflect.ChanDir(v)
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}
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}
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}
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params := a.funcParams(cgn.obj)
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a.addConstraint(&reflectChanOfConstraint{
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cgn: cgn,
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t: params + 1,
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result: a.funcResults(cgn.obj),
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dirs: dirMap[dir],
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})
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}
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// ---------- func Indirect(v Value) Value ----------
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// result = Indirect(v)
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type reflectIndirectConstraint struct {
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cgn *cgnode
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v nodeid // (ptr)
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result nodeid
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}
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func (c *reflectIndirectConstraint) String() string {
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return fmt.Sprintf("n%d = reflect.Indirect(n%d)", c.result, c.v)
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}
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func (c *reflectIndirectConstraint) ptr() nodeid {
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return c.v
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}
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func (c *reflectIndirectConstraint) solve(a *analysis, _ *node, delta nodeset) {
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changed := false
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for vObj := range delta {
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tDyn, _, _ := a.taggedValue(vObj)
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if tDyn == nil {
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panic("not a tagged value")
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}
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var res nodeid
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if tPtr, ok := tDyn.Underlying().(*types.Pointer); ok {
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// load the payload of the pointer's tagged object
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// into a new tagged object
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res = a.makeTagged(tPtr.Elem(), c.cgn, nil)
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a.load(res+1, vObj+1, 0, a.sizeof(tPtr.Elem()))
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} else {
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res = vObj
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}
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if a.addLabel(c.result, res) {
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changed = true
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}
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}
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if changed {
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a.addWork(c.result)
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}
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}
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func ext۰reflect۰Indirect(a *analysis, cgn *cgnode) {
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a.addConstraint(&reflectIndirectConstraint{
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cgn: cgn,
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v: a.funcParams(cgn.obj),
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result: a.funcResults(cgn.obj),
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})
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}
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// ---------- func MakeChan(Type) Value ----------
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// result = MakeChan(typ)
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type reflectMakeChanConstraint struct {
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cgn *cgnode
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typ nodeid // (ptr)
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result nodeid
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}
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func (c *reflectMakeChanConstraint) String() string {
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return fmt.Sprintf("n%d = reflect.MakeChan(n%d)", c.result, c.typ)
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}
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func (c *reflectMakeChanConstraint) ptr() nodeid {
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return c.typ
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}
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func (c *reflectMakeChanConstraint) solve(a *analysis, _ *node, delta nodeset) {
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changed := false
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for typObj := range delta {
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T := a.rtypeTaggedValue(typObj)
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tChan, ok := T.Underlying().(*types.Chan)
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if !ok || tChan.Dir() != ast.SEND|ast.RECV {
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continue // not a bidirectional channel type
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}
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obj := a.nextNode()
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a.addNodes(tChan.Elem(), "reflect.MakeChan.value")
|
||
a.endObject(obj, c.cgn, nil)
|
||
|
||
// put its address in a new T-tagged object
|
||
id := a.makeTagged(T, c.cgn, nil)
|
||
a.addLabel(id+1, obj)
|
||
|
||
// flow the T-tagged object to the result
|
||
if a.addLabel(c.result, id) {
|
||
changed = true
|
||
}
|
||
}
|
||
if changed {
|
||
a.addWork(c.result)
|
||
}
|
||
}
|
||
|
||
func ext۰reflect۰MakeChan(a *analysis, cgn *cgnode) {
|
||
a.addConstraint(&reflectMakeChanConstraint{
|
||
cgn: cgn,
|
||
typ: a.funcParams(cgn.obj),
|
||
result: a.funcResults(cgn.obj),
|
||
})
|
||
}
|
||
|
||
func ext۰reflect۰MakeFunc(a *analysis, cgn *cgnode) {}
|
||
|
||
// ---------- func MakeMap(Type) Value ----------
|
||
|
||
// result = MakeMap(typ)
|
||
type reflectMakeMapConstraint struct {
|
||
cgn *cgnode
|
||
typ nodeid // (ptr)
|
||
result nodeid
|
||
}
|
||
|
||
func (c *reflectMakeMapConstraint) String() string {
|
||
return fmt.Sprintf("n%d = reflect.MakeMap(n%d)", c.result, c.typ)
|
||
}
|
||
|
||
func (c *reflectMakeMapConstraint) ptr() nodeid {
|
||
return c.typ
|
||
}
|
||
|
||
func (c *reflectMakeMapConstraint) solve(a *analysis, _ *node, delta nodeset) {
|
||
changed := false
|
||
for typObj := range delta {
|
||
T := a.rtypeTaggedValue(typObj)
|
||
tMap, ok := T.Underlying().(*types.Map)
|
||
if !ok {
|
||
continue // not a map type
|
||
}
|
||
|
||
mapObj := a.nextNode()
|
||
a.addNodes(tMap.Key(), "reflect.MakeMap.key")
|
||
a.addNodes(tMap.Elem(), "reflect.MakeMap.value")
|
||
a.endObject(mapObj, c.cgn, nil)
|
||
|
||
// put its address in a new T-tagged object
|
||
id := a.makeTagged(T, c.cgn, nil)
|
||
a.addLabel(id+1, mapObj)
|
||
|
||
// flow the T-tagged object to the result
|
||
if a.addLabel(c.result, id) {
|
||
changed = true
|
||
}
|
||
}
|
||
if changed {
|
||
a.addWork(c.result)
|
||
}
|
||
}
|
||
|
||
func ext۰reflect۰MakeMap(a *analysis, cgn *cgnode) {
|
||
a.addConstraint(&reflectMakeMapConstraint{
|
||
cgn: cgn,
|
||
typ: a.funcParams(cgn.obj),
|
||
result: a.funcResults(cgn.obj),
|
||
})
|
||
}
|
||
|
||
func ext۰reflect۰MakeSlice(a *analysis, cgn *cgnode) {}
|
||
func ext۰reflect۰MapOf(a *analysis, cgn *cgnode) {}
|
||
|
||
// ---------- func New(Type) Value ----------
|
||
|
||
// result = New(typ)
|
||
type reflectNewConstraint struct {
|
||
cgn *cgnode
|
||
typ nodeid // (ptr)
|
||
result nodeid
|
||
}
|
||
|
||
func (c *reflectNewConstraint) String() string {
|
||
return fmt.Sprintf("n%d = reflect.New(n%d)", c.result, c.typ)
|
||
}
|
||
|
||
func (c *reflectNewConstraint) ptr() nodeid {
|
||
return c.typ
|
||
}
|
||
|
||
func (c *reflectNewConstraint) solve(a *analysis, _ *node, delta nodeset) {
|
||
changed := false
|
||
for typObj := range delta {
|
||
T := a.rtypeTaggedValue(typObj)
|
||
|
||
// allocate new T object
|
||
newObj := a.nextNode()
|
||
a.addNodes(T, "reflect.New")
|
||
a.endObject(newObj, c.cgn, nil)
|
||
|
||
// put its address in a new *T-tagged object
|
||
id := a.makeTagged(types.NewPointer(T), c.cgn, nil)
|
||
a.addLabel(id+1, newObj)
|
||
|
||
// flow the pointer to the result
|
||
if a.addLabel(c.result, id) {
|
||
changed = true
|
||
}
|
||
}
|
||
if changed {
|
||
a.addWork(c.result)
|
||
}
|
||
}
|
||
|
||
func ext۰reflect۰New(a *analysis, cgn *cgnode) {
|
||
a.addConstraint(&reflectNewConstraint{
|
||
cgn: cgn,
|
||
typ: a.funcParams(cgn.obj),
|
||
result: a.funcResults(cgn.obj),
|
||
})
|
||
}
|
||
|
||
func ext۰reflect۰NewAt(a *analysis, cgn *cgnode) {
|
||
ext۰reflect۰New(a, cgn)
|
||
|
||
// TODO(adonovan): also report dynamic calls to unsound intrinsics.
|
||
if site := cgn.callersite; site != nil {
|
||
a.warnf(site.pos(), "unsound: %s contains a reflect.NewAt() call", site.instr.Parent())
|
||
}
|
||
}
|
||
|
||
func ext۰reflect۰PtrTo(a *analysis, cgn *cgnode) {}
|
||
func ext۰reflect۰Select(a *analysis, cgn *cgnode) {}
|
||
func ext۰reflect۰SliceOf(a *analysis, cgn *cgnode) {}
|
||
|
||
// ---------- func TypeOf(v Value) Type ----------
|
||
|
||
// result = TypeOf(i)
|
||
type reflectTypeOfConstraint struct {
|
||
cgn *cgnode
|
||
i nodeid // (ptr)
|
||
result nodeid
|
||
}
|
||
|
||
func (c *reflectTypeOfConstraint) String() string {
|
||
return fmt.Sprintf("n%d = reflect.TypeOf(n%d)", c.result, c.i)
|
||
}
|
||
|
||
func (c *reflectTypeOfConstraint) ptr() nodeid {
|
||
return c.i
|
||
}
|
||
|
||
func (c *reflectTypeOfConstraint) solve(a *analysis, _ *node, delta nodeset) {
|
||
changed := false
|
||
for iObj := range delta {
|
||
tDyn, _, _ := a.taggedValue(iObj)
|
||
if tDyn == nil {
|
||
panic("not a tagged value")
|
||
}
|
||
|
||
if a.addLabel(c.result, a.makeRtype(tDyn)) {
|
||
changed = true
|
||
}
|
||
}
|
||
if changed {
|
||
a.addWork(c.result)
|
||
}
|
||
}
|
||
|
||
func ext۰reflect۰TypeOf(a *analysis, cgn *cgnode) {
|
||
a.addConstraint(&reflectTypeOfConstraint{
|
||
cgn: cgn,
|
||
i: a.funcParams(cgn.obj),
|
||
result: a.funcResults(cgn.obj),
|
||
})
|
||
}
|
||
|
||
// ---------- func ValueOf(interface{}) Value ----------
|
||
|
||
func ext۰reflect۰ValueOf(a *analysis, cgn *cgnode) {
|
||
// TODO(adonovan): when we start creating indirect tagged
|
||
// objects, we'll need to handle them specially here since
|
||
// they must never appear in the PTS of an interface{}.
|
||
a.copy(a.funcResults(cgn.obj), a.funcParams(cgn.obj), 1)
|
||
}
|
||
|
||
// ---------- func Zero(Type) Value ----------
|
||
|
||
// result = Zero(typ)
|
||
type reflectZeroConstraint struct {
|
||
cgn *cgnode
|
||
typ nodeid // (ptr)
|
||
result nodeid
|
||
}
|
||
|
||
func (c *reflectZeroConstraint) String() string {
|
||
return fmt.Sprintf("n%d = reflect.Zero(n%d)", c.result, c.typ)
|
||
}
|
||
|
||
func (c *reflectZeroConstraint) ptr() nodeid {
|
||
return c.typ
|
||
}
|
||
|
||
func (c *reflectZeroConstraint) solve(a *analysis, _ *node, delta nodeset) {
|
||
changed := false
|
||
for typObj := range delta {
|
||
T := a.rtypeTaggedValue(typObj)
|
||
|
||
// memoize using a.reflectZeros[T]
|
||
var id nodeid
|
||
if z := a.reflectZeros.At(T); false && z != nil {
|
||
id = z.(nodeid)
|
||
} else {
|
||
id = a.makeTagged(T, c.cgn, nil)
|
||
a.reflectZeros.Set(T, id)
|
||
}
|
||
if a.addLabel(c.result, id) {
|
||
changed = true
|
||
}
|
||
}
|
||
if changed {
|
||
a.addWork(c.result)
|
||
}
|
||
}
|
||
|
||
func ext۰reflect۰Zero(a *analysis, cgn *cgnode) {
|
||
a.addConstraint(&reflectZeroConstraint{
|
||
cgn: cgn,
|
||
typ: a.funcParams(cgn.obj),
|
||
result: a.funcResults(cgn.obj),
|
||
})
|
||
}
|
||
|
||
// -------------------- (*reflect.rtype) methods --------------------
|
||
|
||
// ---------- func (*rtype) Elem() Type ----------
|
||
|
||
// result = Elem(t)
|
||
type rtypeElemConstraint struct {
|
||
cgn *cgnode
|
||
t nodeid // (ptr)
|
||
result nodeid
|
||
}
|
||
|
||
func (c *rtypeElemConstraint) String() string {
|
||
return fmt.Sprintf("n%d = (*reflect.rtype).Elem(n%d)", c.result, c.t)
|
||
}
|
||
|
||
func (c *rtypeElemConstraint) ptr() nodeid {
|
||
return c.t
|
||
}
|
||
|
||
func (c *rtypeElemConstraint) solve(a *analysis, _ *node, delta nodeset) {
|
||
// Implemented by *types.{Map,Chan,Array,Slice,Pointer}.
|
||
type hasElem interface {
|
||
Elem() types.Type
|
||
}
|
||
changed := false
|
||
for tObj := range delta {
|
||
T := a.nodes[tObj].obj.data.(types.Type)
|
||
if tHasElem, ok := T.Underlying().(hasElem); ok {
|
||
if a.addLabel(c.result, a.makeRtype(tHasElem.Elem())) {
|
||
changed = true
|
||
}
|
||
}
|
||
}
|
||
if changed {
|
||
a.addWork(c.result)
|
||
}
|
||
}
|
||
|
||
func ext۰reflect۰rtype۰Elem(a *analysis, cgn *cgnode) {
|
||
a.addConstraint(&rtypeElemConstraint{
|
||
cgn: cgn,
|
||
t: a.funcParams(cgn.obj),
|
||
result: a.funcResults(cgn.obj),
|
||
})
|
||
}
|
||
|
||
func ext۰reflect۰rtype۰Field(a *analysis, cgn *cgnode) {}
|
||
func ext۰reflect۰rtype۰FieldByIndex(a *analysis, cgn *cgnode) {}
|
||
func ext۰reflect۰rtype۰FieldByName(a *analysis, cgn *cgnode) {}
|
||
func ext۰reflect۰rtype۰FieldByNameFunc(a *analysis, cgn *cgnode) {}
|
||
|
||
// ---------- func (*rtype) In/Out() Type ----------
|
||
|
||
// result = In/Out(t)
|
||
type rtypeInOutConstraint struct {
|
||
cgn *cgnode
|
||
t nodeid // (ptr)
|
||
result nodeid
|
||
out bool
|
||
}
|
||
|
||
func (c *rtypeInOutConstraint) String() string {
|
||
return fmt.Sprintf("n%d = (*reflect.rtype).InOut(n%d)", c.result, c.t)
|
||
}
|
||
|
||
func (c *rtypeInOutConstraint) ptr() nodeid {
|
||
return c.t
|
||
}
|
||
|
||
func (c *rtypeInOutConstraint) solve(a *analysis, _ *node, delta nodeset) {
|
||
changed := false
|
||
for tObj := range delta {
|
||
T := a.nodes[tObj].obj.data.(types.Type)
|
||
sig, ok := T.Underlying().(*types.Signature)
|
||
if !ok {
|
||
continue // not a func type
|
||
}
|
||
|
||
tuple := sig.Params()
|
||
if c.out {
|
||
tuple = sig.Results()
|
||
}
|
||
// TODO(adonovan): when a function is analyzed
|
||
// context-sensitively, we should be able to see its
|
||
// caller's actual parameter's ssa.Values. Refactor
|
||
// the intrinsic mechanism to allow this. Then if the
|
||
// value is an int const K, skip the loop and use
|
||
// tuple.At(K).
|
||
for i, n := 0, tuple.Len(); i < n; i++ {
|
||
if a.addLabel(c.result, a.makeRtype(tuple.At(i).Type())) {
|
||
changed = true
|
||
}
|
||
}
|
||
}
|
||
if changed {
|
||
a.addWork(c.result)
|
||
}
|
||
}
|
||
|
||
func ext۰reflect۰rtype۰InOut(a *analysis, cgn *cgnode, out bool) {
|
||
a.addConstraint(&rtypeInOutConstraint{
|
||
cgn: cgn,
|
||
t: a.funcParams(cgn.obj),
|
||
result: a.funcResults(cgn.obj),
|
||
out: out,
|
||
})
|
||
}
|
||
|
||
func ext۰reflect۰rtype۰In(a *analysis, cgn *cgnode) {
|
||
ext۰reflect۰rtype۰InOut(a, cgn, false)
|
||
}
|
||
|
||
func ext۰reflect۰rtype۰Out(a *analysis, cgn *cgnode) {
|
||
ext۰reflect۰rtype۰InOut(a, cgn, true)
|
||
}
|
||
|
||
// ---------- func (*rtype) Key() Type ----------
|
||
|
||
// result = Key(t)
|
||
type rtypeKeyConstraint struct {
|
||
cgn *cgnode
|
||
t nodeid // (ptr)
|
||
result nodeid
|
||
}
|
||
|
||
func (c *rtypeKeyConstraint) String() string {
|
||
return fmt.Sprintf("n%d = (*reflect.rtype).Key(n%d)", c.result, c.t)
|
||
}
|
||
|
||
func (c *rtypeKeyConstraint) ptr() nodeid {
|
||
return c.t
|
||
}
|
||
|
||
func (c *rtypeKeyConstraint) solve(a *analysis, _ *node, delta nodeset) {
|
||
changed := false
|
||
for tObj := range delta {
|
||
T := a.nodes[tObj].obj.data.(types.Type)
|
||
if tMap, ok := T.Underlying().(*types.Map); ok {
|
||
if a.addLabel(c.result, a.makeRtype(tMap.Key())) {
|
||
changed = true
|
||
}
|
||
}
|
||
}
|
||
if changed {
|
||
a.addWork(c.result)
|
||
}
|
||
}
|
||
|
||
func ext۰reflect۰rtype۰Key(a *analysis, cgn *cgnode) {
|
||
a.addConstraint(&rtypeKeyConstraint{
|
||
cgn: cgn,
|
||
t: a.funcParams(cgn.obj),
|
||
result: a.funcResults(cgn.obj),
|
||
})
|
||
}
|
||
|
||
func ext۰reflect۰rtype۰Method(a *analysis, cgn *cgnode) {}
|
||
func ext۰reflect۰rtype۰MethodByName(a *analysis, cgn *cgnode) {}
|