mirror of
https://github.com/golang/go
synced 2024-11-19 02:54:42 -07:00
94c387c610
The implementation follows the basic pattern of an indirect
function call (genDynamicCall).
We use the same trick as SetFinalizer so that direct calls to
(r.V).Call, which are overwhelmingly the norm, are inlined.
Bug fix (and simplification): calling untag() to unbox a
reflect.Value is wrong for reflect.Values containing interfaces
(rare). Now, we call untag for concrete types and typeFilter
for interface types, and we can use this pattern in all cases.
It corresponds to the ssa.TypeAssert operator, so we call
it typeAssert. Added tests to cover this.
We also specialize reflect.{In,Out} when the operand is an int
literal.
+ Tests.
Also:
- make taggedValue() panic, not return nil, eliminating many checks.
We call isTaggedValue for the one place that cares.
- pointer_test: recover from panics in Analyze() and dump the log.
R=crawshaw
CC=golang-dev
https://golang.org/cl/14426050
1627 lines
39 KiB
Go
1627 lines
39 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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// 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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//
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// TODO(adonovan): this file is rather subtle. Explain how we derive
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// the implementation of each reflect operator from its spec,
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// including the subtleties of reflect.flag{Addr,RO,Indir}.
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// [Hint: our implementation is as if reflect.flagIndir was always
|
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// true, i.e. reflect.Values are pointers to tagged objects, there is
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// no inline allocation optimization; and indirect tagged objects (not
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// yet implemented) correspond to reflect.Values with
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// reflect.flagAddr.]
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// A picture would help too.
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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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|
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func ext۰reflect۰Value۰Addr(a *analysis, cgn *cgnode) {}
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|
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// ---------- func (Value).Bytes() Value ----------
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|
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// result = v.Bytes()
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type rVBytesConstraint struct {
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v nodeid // (ptr)
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result nodeid
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}
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func (c *rVBytesConstraint) String() string {
|
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return fmt.Sprintf("n%d = reflect n%d.Bytes()", c.result, c.v)
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}
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func (c *rVBytesConstraint) ptr() nodeid {
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return c.v
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}
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func (c *rVBytesConstraint) 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, slice, indirect := a.taggedValue(vObj)
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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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tSlice, ok := tDyn.Underlying().(*types.Slice)
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if ok && types.IsIdentical(tSlice.Elem(), types.Typ[types.Uint8]) {
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if a.onlineCopy(c.result, slice) {
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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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func ext۰reflect۰Value۰Bytes(a *analysis, cgn *cgnode) {
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a.addConstraint(&rVBytesConstraint{
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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).Call(in []Value) []Value ----------
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// result = v.Call(in)
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type rVCallConstraint struct {
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cgn *cgnode
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targets nodeid
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v nodeid // (ptr)
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arg nodeid // = in[*]
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result nodeid
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dotdotdot bool // interpret last arg as a "..." slice
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}
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func (c *rVCallConstraint) String() string {
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return fmt.Sprintf("n%d = reflect n%d.Call(n%d)", c.result, c.v, c.arg)
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}
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func (c *rVCallConstraint) ptr() nodeid {
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return c.v
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}
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func (c *rVCallConstraint) solve(a *analysis, _ *node, delta nodeset) {
|
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if c.targets == 0 {
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panic("no targets")
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}
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changed := false
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for vObj := range delta {
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tDyn, fn, indirect := a.taggedValue(vObj)
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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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tSig, ok := tDyn.Underlying().(*types.Signature)
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if !ok {
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continue // not a function
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}
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if tSig.Recv() != nil {
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panic(tSig) // TODO(adonovan): rethink when we implement Method()
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}
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// Add dynamic call target.
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if a.onlineCopy(c.targets, fn) {
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a.addWork(c.targets)
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// TODO(adonovan): is 'else continue' a sound optimisation here?
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}
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// Allocate a P/R block.
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tParams := tSig.Params()
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tResults := tSig.Results()
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params := a.addNodes(tParams, "rVCall.params")
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results := a.addNodes(tResults, "rVCall.results")
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// Make a dynamic call to 'fn'.
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a.store(fn, params, 1, a.sizeof(tParams))
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a.load(results, fn, 1+a.sizeof(tParams), a.sizeof(tResults))
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// Populate P by type-asserting each actual arg (all merged in c.arg).
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for i, n := 0, tParams.Len(); i < n; i++ {
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T := tParams.At(i).Type()
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a.typeAssert(T, params, c.arg, false)
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params += nodeid(a.sizeof(T))
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}
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|
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// Use R by tagging and copying each actual result to c.result.
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for i, n := 0, tResults.Len(); i < n; i++ {
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T := tResults.At(i).Type()
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// Convert from an arbitrary type to a reflect.Value
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// (like MakeInterface followed by reflect.ValueOf).
|
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if isInterface(T) {
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// (don't tag)
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if a.onlineCopy(c.result, results) {
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changed = true
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}
|
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} else {
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obj := a.makeTagged(T, c.cgn, nil)
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a.onlineCopyN(obj+1, results, a.sizeof(T))
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if a.addLabel(c.result, obj) { // (true)
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changed = true
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}
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}
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results += nodeid(a.sizeof(T))
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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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// Common code for direct (inlined) and indirect calls to (reflect.Value).Call.
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func reflectCallImpl(a *analysis, cgn *cgnode, site *callsite, recv, arg nodeid, dotdotdot bool) nodeid {
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// Allocate []reflect.Value array for the result.
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ret := a.nextNode()
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a.addNodes(types.NewArray(a.reflectValueObj.Type(), 1), "rVCall.ret")
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a.endObject(ret, cgn, nil)
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// pts(targets) will be the set of possible call targets.
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site.targets = a.addOneNode(tInvalid, "rvCall.targets", nil)
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// All arguments are merged since they arrive in a slice.
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argelts := a.addOneNode(a.reflectValueObj.Type(), "rVCall.args", nil)
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a.load(argelts, arg, 1, 1) // slice elements
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a.addConstraint(&rVCallConstraint{
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cgn: cgn,
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targets: site.targets,
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v: recv,
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arg: argelts,
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result: ret + 1, // results go into elements of ret
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dotdotdot: dotdotdot,
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})
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return ret
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}
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func reflectCall(a *analysis, cgn *cgnode, dotdotdot bool) {
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// This is the shared contour implementation of (reflect.Value).Call
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// and CallSlice, as used by indirect calls (rare).
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// Direct calls are inlined in gen.go, eliding the
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// intermediate cgnode for Call.
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site := new(callsite)
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cgn.sites = append(cgn.sites, site)
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recv := a.funcParams(cgn.obj)
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arg := recv + 1
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ret := reflectCallImpl(a, cgn, site, recv, arg, dotdotdot)
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a.addressOf(a.funcResults(cgn.obj), ret)
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}
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func ext۰reflect۰Value۰Call(a *analysis, cgn *cgnode) {
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reflectCall(a, cgn, false)
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}
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func ext۰reflect۰Value۰CallSlice(a *analysis, cgn *cgnode) {
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// TODO(adonovan): implement. Also, inline direct calls in gen.go too.
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if false {
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reflectCall(a, cgn, true)
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}
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}
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func ext۰reflect۰Value۰Convert(a *analysis, cgn *cgnode) {}
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|
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// ---------- func (Value).Elem() Value ----------
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// result = v.Elem()
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type rVElemConstraint 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 *rVElemConstraint) String() string {
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return fmt.Sprintf("n%d = reflect n%d.Elem()", c.result, c.v)
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}
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func (c *rVElemConstraint) ptr() nodeid {
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return c.v
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}
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|
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func (c *rVElemConstraint) 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, payload, indirect := a.taggedValue(vObj)
|
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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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|
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switch t := tDyn.Underlying().(type) {
|
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case *types.Interface:
|
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if a.onlineCopy(c.result, payload) {
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changed = true
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}
|
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|
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case *types.Pointer:
|
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obj := a.makeTagged(t.Elem(), c.cgn, nil)
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a.load(obj+1, payload, 0, a.sizeof(t.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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}
|
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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 ext۰reflect۰Value۰Elem(a *analysis, cgn *cgnode) {
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a.addConstraint(&rVElemConstraint{
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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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|
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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 (Value).Index() Value ----------
|
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|
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// result = v.Index()
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type rVIndexConstraint struct {
|
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cgn *cgnode
|
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v nodeid // (ptr)
|
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result nodeid
|
||
}
|
||
|
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func (c *rVIndexConstraint) String() string {
|
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return fmt.Sprintf("n%d = reflect n%d.Index()", c.result, c.v)
|
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}
|
||
|
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func (c *rVIndexConstraint) ptr() nodeid {
|
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return c.v
|
||
}
|
||
|
||
func (c *rVIndexConstraint) solve(a *analysis, _ *node, delta nodeset) {
|
||
changed := false
|
||
for vObj := range delta {
|
||
tDyn, payload, indirect := a.taggedValue(vObj)
|
||
if indirect {
|
||
// TODO(adonovan): we'll need to implement this
|
||
// when we start creating indirect tagged objects.
|
||
panic("indirect tagged object")
|
||
}
|
||
|
||
var res nodeid
|
||
switch t := tDyn.Underlying().(type) {
|
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case *types.Array:
|
||
res = a.makeTagged(t.Elem(), c.cgn, nil)
|
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a.onlineCopyN(res+1, payload+1, a.sizeof(t.Elem()))
|
||
|
||
case *types.Slice:
|
||
res = a.makeTagged(t.Elem(), c.cgn, nil)
|
||
a.load(res+1, payload, 1, a.sizeof(t.Elem()))
|
||
|
||
case *types.Basic:
|
||
if t.Kind() == types.String {
|
||
res = a.makeTagged(types.Typ[types.Rune], c.cgn, nil)
|
||
}
|
||
}
|
||
if res != 0 && a.addLabel(c.result, res) {
|
||
changed = true
|
||
}
|
||
}
|
||
if changed {
|
||
a.addWork(c.result)
|
||
}
|
||
}
|
||
|
||
func ext۰reflect۰Value۰Index(a *analysis, cgn *cgnode) {
|
||
a.addConstraint(&rVIndexConstraint{
|
||
cgn: cgn,
|
||
v: a.funcParams(cgn.obj),
|
||
result: a.funcResults(cgn.obj),
|
||
})
|
||
}
|
||
|
||
// ---------- func (Value).Interface() Value ----------
|
||
|
||
// result = v.Interface()
|
||
type rVInterfaceConstraint struct {
|
||
v nodeid // (ptr)
|
||
result nodeid
|
||
}
|
||
|
||
func (c *rVInterfaceConstraint) String() string {
|
||
return fmt.Sprintf("n%d = reflect n%d.Interface()", c.result, c.v)
|
||
}
|
||
|
||
func (c *rVInterfaceConstraint) ptr() nodeid {
|
||
return c.v
|
||
}
|
||
|
||
func (c *rVInterfaceConstraint) solve(a *analysis, _ *node, delta nodeset) {
|
||
resultPts := &a.nodes[c.result].pts
|
||
changed := false
|
||
for vObj := range delta {
|
||
tDyn, payload, indirect := a.taggedValue(vObj)
|
||
if indirect {
|
||
// TODO(adonovan): we'll need to implement this
|
||
// when we start creating indirect tagged objects.
|
||
panic("indirect tagged object")
|
||
}
|
||
|
||
if isInterface(tDyn) {
|
||
if a.onlineCopy(c.result, payload) {
|
||
a.addWork(c.result)
|
||
}
|
||
} else {
|
||
if resultPts.add(vObj) {
|
||
changed = true
|
||
}
|
||
}
|
||
}
|
||
if changed {
|
||
a.addWork(c.result)
|
||
}
|
||
}
|
||
|
||
func ext۰reflect۰Value۰Interface(a *analysis, cgn *cgnode) {
|
||
a.addConstraint(&rVInterfaceConstraint{
|
||
v: a.funcParams(cgn.obj),
|
||
result: a.funcResults(cgn.obj),
|
||
})
|
||
}
|
||
|
||
// ---------- func (Value).MapIndex(Value) Value ----------
|
||
|
||
// result = v.MapIndex(_)
|
||
type rVMapIndexConstraint struct {
|
||
cgn *cgnode
|
||
v nodeid // (ptr)
|
||
result nodeid
|
||
}
|
||
|
||
func (c *rVMapIndexConstraint) String() string {
|
||
return fmt.Sprintf("n%d = reflect n%d.MapIndex(_)", c.result, c.v)
|
||
}
|
||
|
||
func (c *rVMapIndexConstraint) ptr() nodeid {
|
||
return c.v
|
||
}
|
||
|
||
func (c *rVMapIndexConstraint) solve(a *analysis, _ *node, delta nodeset) {
|
||
changed := false
|
||
for vObj := range delta {
|
||
tDyn, m, indirect := a.taggedValue(vObj)
|
||
tMap, _ := tDyn.Underlying().(*types.Map)
|
||
if tMap == nil {
|
||
continue // not a map
|
||
}
|
||
if indirect {
|
||
// TODO(adonovan): we'll need to implement this
|
||
// when we start creating indirect tagged objects.
|
||
panic("indirect tagged object")
|
||
}
|
||
|
||
obj := a.makeTagged(tMap.Elem(), c.cgn, nil)
|
||
a.load(obj+1, m, a.sizeof(tMap.Key()), a.sizeof(tMap.Elem()))
|
||
if a.addLabel(c.result, obj) {
|
||
changed = true
|
||
}
|
||
}
|
||
if changed {
|
||
a.addWork(c.result)
|
||
}
|
||
}
|
||
|
||
func ext۰reflect۰Value۰MapIndex(a *analysis, cgn *cgnode) {
|
||
a.addConstraint(&rVMapIndexConstraint{
|
||
cgn: cgn,
|
||
v: a.funcParams(cgn.obj),
|
||
result: a.funcResults(cgn.obj),
|
||
})
|
||
}
|
||
|
||
// ---------- func (Value).MapKeys() []Value ----------
|
||
|
||
// result = v.MapKeys()
|
||
type rVMapKeysConstraint struct {
|
||
cgn *cgnode
|
||
v nodeid // (ptr)
|
||
result nodeid
|
||
}
|
||
|
||
func (c *rVMapKeysConstraint) String() string {
|
||
return fmt.Sprintf("n%d = reflect n%d.MapKeys()", c.result, c.v)
|
||
}
|
||
|
||
func (c *rVMapKeysConstraint) ptr() nodeid {
|
||
return c.v
|
||
}
|
||
|
||
func (c *rVMapKeysConstraint) solve(a *analysis, _ *node, delta nodeset) {
|
||
changed := false
|
||
for vObj := range delta {
|
||
tDyn, m, indirect := a.taggedValue(vObj)
|
||
tMap, _ := tDyn.Underlying().(*types.Map)
|
||
if tMap == nil {
|
||
continue // not a map
|
||
}
|
||
if indirect {
|
||
// TODO(adonovan): we'll need to implement this
|
||
// when we start creating indirect tagged objects.
|
||
panic("indirect tagged object")
|
||
}
|
||
|
||
kObj := a.makeTagged(tMap.Key(), c.cgn, nil)
|
||
a.load(kObj+1, m, 0, a.sizeof(tMap.Key()))
|
||
if a.addLabel(c.result, kObj) {
|
||
changed = true
|
||
}
|
||
}
|
||
if changed {
|
||
a.addWork(c.result)
|
||
}
|
||
}
|
||
|
||
func ext۰reflect۰Value۰MapKeys(a *analysis, cgn *cgnode) {
|
||
// Allocate an array for the result.
|
||
obj := a.nextNode()
|
||
a.addNodes(types.NewArray(a.reflectValueObj.Type(), 1), "reflect.MapKeys result")
|
||
a.endObject(obj, cgn, nil)
|
||
a.addressOf(a.funcResults(cgn.obj), obj)
|
||
|
||
a.addConstraint(&rVMapKeysConstraint{
|
||
cgn: cgn,
|
||
v: a.funcParams(cgn.obj),
|
||
result: obj + 1, // result is stored in array elems
|
||
})
|
||
}
|
||
|
||
func ext۰reflect۰Value۰Method(a *analysis, cgn *cgnode) {}
|
||
func ext۰reflect۰Value۰MethodByName(a *analysis, cgn *cgnode) {}
|
||
|
||
// ---------- func (Value).Recv(Value) ----------
|
||
|
||
// result, _ = v.Recv()
|
||
type rVRecvConstraint struct {
|
||
cgn *cgnode
|
||
v nodeid // (ptr)
|
||
result nodeid
|
||
}
|
||
|
||
func (c *rVRecvConstraint) String() string {
|
||
return fmt.Sprintf("n%d = reflect n%d.Recv()", c.result, c.v)
|
||
}
|
||
|
||
func (c *rVRecvConstraint) ptr() nodeid {
|
||
return c.v
|
||
}
|
||
|
||
func (c *rVRecvConstraint) solve(a *analysis, _ *node, delta nodeset) {
|
||
changed := false
|
||
for vObj := range delta {
|
||
tDyn, ch, indirect := a.taggedValue(vObj)
|
||
tChan, _ := tDyn.Underlying().(*types.Chan)
|
||
if tChan == nil {
|
||
continue // not a channel
|
||
}
|
||
if indirect {
|
||
// TODO(adonovan): we'll need to implement this
|
||
// when we start creating indirect tagged objects.
|
||
panic("indirect tagged object")
|
||
}
|
||
|
||
tElem := tChan.Elem()
|
||
elemObj := a.makeTagged(tElem, c.cgn, nil)
|
||
a.load(elemObj+1, ch, 0, a.sizeof(tElem))
|
||
if a.addLabel(c.result, elemObj) {
|
||
changed = true
|
||
}
|
||
}
|
||
if changed {
|
||
a.addWork(c.result)
|
||
}
|
||
}
|
||
|
||
func ext۰reflect۰Value۰Recv(a *analysis, cgn *cgnode) {
|
||
a.addConstraint(&rVRecvConstraint{
|
||
cgn: cgn,
|
||
v: a.funcParams(cgn.obj),
|
||
result: a.funcResults(cgn.obj),
|
||
})
|
||
}
|
||
|
||
// ---------- func (Value).Send(Value) ----------
|
||
|
||
// v.Send(x)
|
||
type rVSendConstraint struct {
|
||
cgn *cgnode
|
||
v nodeid // (ptr)
|
||
x nodeid
|
||
}
|
||
|
||
func (c *rVSendConstraint) String() string {
|
||
return fmt.Sprintf("reflect n%d.Send(n%d)", c.v, c.x)
|
||
}
|
||
|
||
func (c *rVSendConstraint) ptr() nodeid {
|
||
return c.v
|
||
}
|
||
|
||
func (c *rVSendConstraint) solve(a *analysis, _ *node, delta nodeset) {
|
||
for vObj := range delta {
|
||
tDyn, ch, indirect := a.taggedValue(vObj)
|
||
tChan, _ := tDyn.Underlying().(*types.Chan)
|
||
if tChan == nil {
|
||
continue // not a channel
|
||
}
|
||
if indirect {
|
||
// TODO(adonovan): we'll need to implement this
|
||
// when we start creating indirect tagged objects.
|
||
panic("indirect tagged object")
|
||
}
|
||
|
||
// Extract x's payload to xtmp, then store to channel.
|
||
tElem := tChan.Elem()
|
||
xtmp := a.addNodes(tElem, "Send.xtmp")
|
||
a.typeAssert(tElem, xtmp, c.x, false)
|
||
a.store(ch, xtmp, 0, a.sizeof(tElem))
|
||
}
|
||
}
|
||
|
||
func ext۰reflect۰Value۰Send(a *analysis, cgn *cgnode) {
|
||
params := a.funcParams(cgn.obj)
|
||
a.addConstraint(&rVSendConstraint{
|
||
cgn: cgn,
|
||
v: params,
|
||
x: params + 1,
|
||
})
|
||
}
|
||
|
||
func ext۰reflect۰Value۰Set(a *analysis, cgn *cgnode) {}
|
||
|
||
// ---------- func (Value).SetBytes(x []byte) ----------
|
||
|
||
// v.SetBytes(x)
|
||
type rVSetBytesConstraint struct {
|
||
cgn *cgnode
|
||
v nodeid // (ptr)
|
||
x nodeid
|
||
}
|
||
|
||
func (c *rVSetBytesConstraint) String() string {
|
||
return fmt.Sprintf("reflect n%d.SetBytes(n%d)", c.v, c.x)
|
||
}
|
||
|
||
func (c *rVSetBytesConstraint) ptr() nodeid {
|
||
return c.v
|
||
}
|
||
|
||
func (c *rVSetBytesConstraint) solve(a *analysis, _ *node, delta nodeset) {
|
||
for vObj := range delta {
|
||
tDyn, slice, indirect := a.taggedValue(vObj)
|
||
if indirect {
|
||
// TODO(adonovan): we'll need to implement this
|
||
// when we start creating indirect tagged objects.
|
||
panic("indirect tagged object")
|
||
}
|
||
|
||
tSlice, ok := tDyn.Underlying().(*types.Slice)
|
||
if ok && types.IsIdentical(tSlice.Elem(), types.Typ[types.Uint8]) {
|
||
if a.onlineCopy(slice, c.x) {
|
||
a.addWork(slice)
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
func ext۰reflect۰Value۰SetBytes(a *analysis, cgn *cgnode) {
|
||
params := a.funcParams(cgn.obj)
|
||
a.addConstraint(&rVSetBytesConstraint{
|
||
cgn: cgn,
|
||
v: params,
|
||
x: params + 1,
|
||
})
|
||
}
|
||
|
||
// ---------- func (Value).SetMapIndex(k Value, v Value) ----------
|
||
|
||
// v.SetMapIndex(key, val)
|
||
type rVSetMapIndexConstraint struct {
|
||
cgn *cgnode
|
||
v nodeid // (ptr)
|
||
key nodeid
|
||
val nodeid
|
||
}
|
||
|
||
func (c *rVSetMapIndexConstraint) String() string {
|
||
return fmt.Sprintf("reflect n%d.SetMapIndex(n%d, n%d)", c.v, c.key, c.val)
|
||
}
|
||
|
||
func (c *rVSetMapIndexConstraint) ptr() nodeid {
|
||
return c.v
|
||
}
|
||
|
||
func (c *rVSetMapIndexConstraint) solve(a *analysis, _ *node, delta nodeset) {
|
||
for vObj := range delta {
|
||
tDyn, m, indirect := a.taggedValue(vObj)
|
||
tMap, _ := tDyn.Underlying().(*types.Map)
|
||
if tMap == nil {
|
||
continue // not a map
|
||
}
|
||
if indirect {
|
||
// TODO(adonovan): we'll need to implement this
|
||
// when we start creating indirect tagged objects.
|
||
panic("indirect tagged object")
|
||
}
|
||
|
||
keysize := a.sizeof(tMap.Key())
|
||
|
||
// Extract key's payload to keytmp, then store to map key.
|
||
keytmp := a.addNodes(tMap.Key(), "SetMapIndex.keytmp")
|
||
a.typeAssert(tMap.Key(), keytmp, c.key, false)
|
||
a.store(m, keytmp, 0, keysize)
|
||
|
||
// Extract val's payload to vtmp, then store to map value.
|
||
valtmp := a.addNodes(tMap.Elem(), "SetMapIndex.valtmp")
|
||
a.typeAssert(tMap.Elem(), valtmp, c.val, false)
|
||
a.store(m, valtmp, keysize, a.sizeof(tMap.Elem()))
|
||
}
|
||
}
|
||
|
||
func ext۰reflect۰Value۰SetMapIndex(a *analysis, cgn *cgnode) {
|
||
params := a.funcParams(cgn.obj)
|
||
a.addConstraint(&rVSetMapIndexConstraint{
|
||
cgn: cgn,
|
||
v: params,
|
||
key: params + 1,
|
||
val: params + 2,
|
||
})
|
||
}
|
||
|
||
func ext۰reflect۰Value۰SetPointer(a *analysis, cgn *cgnode) {}
|
||
|
||
// ---------- func (Value).Slice(v Value, i, j int) ----------
|
||
|
||
// result = v.Slice(_, _)
|
||
type rVSliceConstraint struct {
|
||
cgn *cgnode
|
||
v nodeid // (ptr)
|
||
result nodeid
|
||
}
|
||
|
||
func (c *rVSliceConstraint) String() string {
|
||
return fmt.Sprintf("n%d = reflect n%d.Slice(_, _)", c.result, c.v)
|
||
}
|
||
|
||
func (c *rVSliceConstraint) ptr() nodeid {
|
||
return c.v
|
||
}
|
||
|
||
func (c *rVSliceConstraint) solve(a *analysis, _ *node, delta nodeset) {
|
||
changed := false
|
||
for vObj := range delta {
|
||
tDyn, payload, indirect := a.taggedValue(vObj)
|
||
if indirect {
|
||
// TODO(adonovan): we'll need to implement this
|
||
// when we start creating indirect tagged objects.
|
||
panic("indirect tagged object")
|
||
}
|
||
|
||
var res nodeid
|
||
switch t := tDyn.Underlying().(type) {
|
||
case *types.Pointer:
|
||
if tArr, ok := t.Elem().Underlying().(*types.Array); ok {
|
||
// pointer to array
|
||
res = a.makeTagged(types.NewSlice(tArr.Elem()), c.cgn, nil)
|
||
if a.onlineCopy(res+1, payload) {
|
||
a.addWork(res + 1)
|
||
}
|
||
}
|
||
|
||
case *types.Array:
|
||
// TODO(adonovan): implement addressable
|
||
// arrays when we do indirect tagged objects.
|
||
|
||
case *types.Slice:
|
||
res = vObj
|
||
|
||
case *types.Basic:
|
||
if t == types.Typ[types.String] {
|
||
res = vObj
|
||
}
|
||
}
|
||
|
||
if res != 0 && a.addLabel(c.result, res) {
|
||
changed = true
|
||
}
|
||
}
|
||
if changed {
|
||
a.addWork(c.result)
|
||
}
|
||
}
|
||
|
||
func ext۰reflect۰Value۰Slice(a *analysis, cgn *cgnode) {
|
||
a.addConstraint(&rVSliceConstraint{
|
||
cgn: cgn,
|
||
v: a.funcParams(cgn.obj),
|
||
result: a.funcResults(cgn.obj),
|
||
})
|
||
}
|
||
|
||
// -------------------- Standalone reflect functions --------------------
|
||
|
||
func ext۰reflect۰Append(a *analysis, cgn *cgnode) {}
|
||
func ext۰reflect۰AppendSlice(a *analysis, cgn *cgnode) {}
|
||
func ext۰reflect۰Copy(a *analysis, cgn *cgnode) {}
|
||
|
||
// ---------- func ChanOf(ChanDir, Type) Type ----------
|
||
|
||
// result = ChanOf(dir, t)
|
||
type reflectChanOfConstraint struct {
|
||
cgn *cgnode
|
||
t nodeid // (ptr)
|
||
result nodeid
|
||
dirs []ast.ChanDir
|
||
}
|
||
|
||
func (c *reflectChanOfConstraint) String() string {
|
||
return fmt.Sprintf("n%d = reflect.ChanOf(n%d)", c.result, c.t)
|
||
}
|
||
|
||
func (c *reflectChanOfConstraint) ptr() nodeid {
|
||
return c.t
|
||
}
|
||
|
||
func (c *reflectChanOfConstraint) solve(a *analysis, _ *node, delta nodeset) {
|
||
changed := false
|
||
for tObj := range delta {
|
||
T := a.rtypeTaggedValue(tObj)
|
||
|
||
for _, dir := range c.dirs {
|
||
if a.addLabel(c.result, a.makeRtype(types.NewChan(dir, T))) {
|
||
changed = true
|
||
}
|
||
}
|
||
}
|
||
if changed {
|
||
a.addWork(c.result)
|
||
}
|
||
}
|
||
|
||
// dirMap maps reflect.ChanDir to the set of channel types generated by ChanOf.
|
||
var dirMap = [...][]ast.ChanDir{
|
||
0: {ast.RECV, ast.SEND, ast.RECV | ast.SEND}, // unknown
|
||
reflect.RecvDir: {ast.RECV},
|
||
reflect.SendDir: {ast.SEND},
|
||
reflect.BothDir: {ast.RECV | ast.SEND},
|
||
}
|
||
|
||
func ext۰reflect۰ChanOf(a *analysis, cgn *cgnode) {
|
||
// If we have access to the callsite,
|
||
// and the channel argument is a constant (as is usual),
|
||
// only generate the requested direction.
|
||
var dir reflect.ChanDir // unknown
|
||
if site := cgn.callersite; site != nil {
|
||
if c, ok := site.instr.Common().Args[0].(*ssa.Const); ok {
|
||
v, _ := exact.Int64Val(c.Value)
|
||
if 0 <= v && v <= int64(reflect.BothDir) {
|
||
dir = reflect.ChanDir(v)
|
||
}
|
||
}
|
||
}
|
||
|
||
params := a.funcParams(cgn.obj)
|
||
a.addConstraint(&reflectChanOfConstraint{
|
||
cgn: cgn,
|
||
t: params + 1,
|
||
result: a.funcResults(cgn.obj),
|
||
dirs: dirMap[dir],
|
||
})
|
||
}
|
||
|
||
// ---------- func Indirect(v Value) Value ----------
|
||
|
||
// result = Indirect(v)
|
||
type reflectIndirectConstraint struct {
|
||
cgn *cgnode
|
||
v nodeid // (ptr)
|
||
result nodeid
|
||
}
|
||
|
||
func (c *reflectIndirectConstraint) String() string {
|
||
return fmt.Sprintf("n%d = reflect.Indirect(n%d)", c.result, c.v)
|
||
}
|
||
|
||
func (c *reflectIndirectConstraint) ptr() nodeid {
|
||
return c.v
|
||
}
|
||
|
||
func (c *reflectIndirectConstraint) solve(a *analysis, _ *node, delta nodeset) {
|
||
changed := false
|
||
for vObj := range delta {
|
||
tDyn, _, _ := a.taggedValue(vObj)
|
||
var res nodeid
|
||
if tPtr, ok := tDyn.Underlying().(*types.Pointer); ok {
|
||
// load the payload of the pointer's tagged object
|
||
// into a new tagged object
|
||
res = a.makeTagged(tPtr.Elem(), c.cgn, nil)
|
||
a.load(res+1, vObj+1, 0, a.sizeof(tPtr.Elem()))
|
||
} else {
|
||
res = vObj
|
||
}
|
||
|
||
if a.addLabel(c.result, res) {
|
||
changed = true
|
||
}
|
||
}
|
||
if changed {
|
||
a.addWork(c.result)
|
||
}
|
||
}
|
||
|
||
func ext۰reflect۰Indirect(a *analysis, cgn *cgnode) {
|
||
a.addConstraint(&reflectIndirectConstraint{
|
||
cgn: cgn,
|
||
v: a.funcParams(cgn.obj),
|
||
result: a.funcResults(cgn.obj),
|
||
})
|
||
}
|
||
|
||
// ---------- func MakeChan(Type) Value ----------
|
||
|
||
// result = MakeChan(typ)
|
||
type reflectMakeChanConstraint struct {
|
||
cgn *cgnode
|
||
typ nodeid // (ptr)
|
||
result nodeid
|
||
}
|
||
|
||
func (c *reflectMakeChanConstraint) String() string {
|
||
return fmt.Sprintf("n%d = reflect.MakeChan(n%d)", c.result, c.typ)
|
||
}
|
||
|
||
func (c *reflectMakeChanConstraint) ptr() nodeid {
|
||
return c.typ
|
||
}
|
||
|
||
func (c *reflectMakeChanConstraint) solve(a *analysis, _ *node, delta nodeset) {
|
||
changed := false
|
||
for typObj := range delta {
|
||
T := a.rtypeTaggedValue(typObj)
|
||
tChan, ok := T.Underlying().(*types.Chan)
|
||
if !ok || tChan.Dir() != ast.SEND|ast.RECV {
|
||
continue // not a bidirectional channel type
|
||
}
|
||
|
||
obj := a.nextNode()
|
||
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 MakeSlice(Type) Value ----------
|
||
|
||
// result = MakeSlice(typ)
|
||
type reflectMakeSliceConstraint struct {
|
||
cgn *cgnode
|
||
typ nodeid // (ptr)
|
||
result nodeid
|
||
}
|
||
|
||
func (c *reflectMakeSliceConstraint) String() string {
|
||
return fmt.Sprintf("n%d = reflect.MakeSlice(n%d)", c.result, c.typ)
|
||
}
|
||
|
||
func (c *reflectMakeSliceConstraint) ptr() nodeid {
|
||
return c.typ
|
||
}
|
||
|
||
func (c *reflectMakeSliceConstraint) solve(a *analysis, _ *node, delta nodeset) {
|
||
changed := false
|
||
for typObj := range delta {
|
||
T := a.rtypeTaggedValue(typObj)
|
||
if _, ok := T.Underlying().(*types.Slice); !ok {
|
||
continue // not a slice type
|
||
}
|
||
|
||
obj := a.nextNode()
|
||
a.addNodes(sliceToArray(T), "reflect.MakeSlice")
|
||
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 ext۰reflect۰MakeSlice(a *analysis, cgn *cgnode) {
|
||
a.addConstraint(&reflectMakeSliceConstraint{
|
||
cgn: cgn,
|
||
typ: a.funcParams(cgn.obj),
|
||
result: a.funcResults(cgn.obj),
|
||
})
|
||
}
|
||
|
||
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 PtrTo(Type) Type ----------
|
||
|
||
// result = PtrTo(t)
|
||
type reflectPtrToConstraint struct {
|
||
cgn *cgnode
|
||
t nodeid // (ptr)
|
||
result nodeid
|
||
}
|
||
|
||
func (c *reflectPtrToConstraint) String() string {
|
||
return fmt.Sprintf("n%d = reflect.PtrTo(n%d)", c.result, c.t)
|
||
}
|
||
|
||
func (c *reflectPtrToConstraint) ptr() nodeid {
|
||
return c.t
|
||
}
|
||
|
||
func (c *reflectPtrToConstraint) solve(a *analysis, _ *node, delta nodeset) {
|
||
changed := false
|
||
for tObj := range delta {
|
||
T := a.rtypeTaggedValue(tObj)
|
||
|
||
if a.addLabel(c.result, a.makeRtype(types.NewPointer(T))) {
|
||
changed = true
|
||
}
|
||
}
|
||
if changed {
|
||
a.addWork(c.result)
|
||
}
|
||
}
|
||
|
||
func ext۰reflect۰PtrTo(a *analysis, cgn *cgnode) {
|
||
a.addConstraint(&reflectPtrToConstraint{
|
||
cgn: cgn,
|
||
t: a.funcParams(cgn.obj),
|
||
result: a.funcResults(cgn.obj),
|
||
})
|
||
}
|
||
|
||
func ext۰reflect۰Select(a *analysis, cgn *cgnode) {}
|
||
|
||
// ---------- func SliceOf(Type) Type ----------
|
||
|
||
// result = SliceOf(t)
|
||
type reflectSliceOfConstraint struct {
|
||
cgn *cgnode
|
||
t nodeid // (ptr)
|
||
result nodeid
|
||
}
|
||
|
||
func (c *reflectSliceOfConstraint) String() string {
|
||
return fmt.Sprintf("n%d = reflect.SliceOf(n%d)", c.result, c.t)
|
||
}
|
||
|
||
func (c *reflectSliceOfConstraint) ptr() nodeid {
|
||
return c.t
|
||
}
|
||
|
||
func (c *reflectSliceOfConstraint) solve(a *analysis, _ *node, delta nodeset) {
|
||
changed := false
|
||
for tObj := range delta {
|
||
T := a.rtypeTaggedValue(tObj)
|
||
|
||
if a.addLabel(c.result, a.makeRtype(types.NewSlice(T))) {
|
||
changed = true
|
||
}
|
||
}
|
||
if changed {
|
||
a.addWork(c.result)
|
||
}
|
||
}
|
||
|
||
func ext۰reflect۰SliceOf(a *analysis, cgn *cgnode) {
|
||
a.addConstraint(&reflectSliceOfConstraint{
|
||
cgn: cgn,
|
||
t: a.funcParams(cgn.obj),
|
||
result: a.funcResults(cgn.obj),
|
||
})
|
||
}
|
||
|
||
// ---------- 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 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)
|
||
|
||
// TODO(adonovan): if T is an interface type, we need
|
||
// to create an indirect tagged object containing
|
||
// new(T). To avoid updates of such shared values,
|
||
// we'll need another flag on indirect tagged objects
|
||
// that marks whether they are addressable or
|
||
// readonly, just like the reflect package does.
|
||
|
||
// 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 (*rtype) Field(int) StructField ----------
|
||
// ---------- func (*rtype) FieldByName(string) (StructField, bool) ----------
|
||
|
||
// result = FieldByName(t, name)
|
||
// result = Field(t, _)
|
||
type rtypeFieldByNameConstraint struct {
|
||
cgn *cgnode
|
||
name string // name of field; "" for unknown
|
||
t nodeid // (ptr)
|
||
result nodeid
|
||
}
|
||
|
||
func (c *rtypeFieldByNameConstraint) String() string {
|
||
return fmt.Sprintf("n%d = (*reflect.rtype).FieldByName(n%d, %q)", c.result, c.t, c.name)
|
||
}
|
||
|
||
func (c *rtypeFieldByNameConstraint) ptr() nodeid {
|
||
return c.t
|
||
}
|
||
|
||
func (c *rtypeFieldByNameConstraint) solve(a *analysis, _ *node, delta nodeset) {
|
||
// type StructField struct {
|
||
// 0 __identity__
|
||
// 1 Name string
|
||
// 2 PkgPath string
|
||
// 3 Type Type
|
||
// 4 Tag StructTag
|
||
// 5 Offset uintptr
|
||
// 6 Index []int
|
||
// 7 Anonymous bool
|
||
// }
|
||
|
||
for tObj := range delta {
|
||
T := a.nodes[tObj].obj.data.(types.Type)
|
||
tStruct, ok := T.Underlying().(*types.Struct)
|
||
if !ok {
|
||
continue // not a struct type
|
||
}
|
||
|
||
n := tStruct.NumFields()
|
||
for i := 0; i < n; i++ {
|
||
f := tStruct.Field(i)
|
||
if c.name == "" || c.name == f.Name() {
|
||
|
||
// a.offsetOf(Type) is 3.
|
||
if id := c.result + 3; a.addLabel(id, a.makeRtype(f.Type())) {
|
||
a.addWork(id)
|
||
}
|
||
// TODO(adonovan): StructField.Index should be non-nil.
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
func ext۰reflect۰rtype۰FieldByName(a *analysis, cgn *cgnode) {
|
||
// If we have access to the callsite,
|
||
// and the argument is a string constant,
|
||
// return only that field.
|
||
var name string
|
||
if site := cgn.callersite; site != nil {
|
||
if c, ok := site.instr.Common().Args[0].(*ssa.Const); ok {
|
||
name = exact.StringVal(c.Value)
|
||
}
|
||
}
|
||
|
||
a.addConstraint(&rtypeFieldByNameConstraint{
|
||
cgn: cgn,
|
||
name: name,
|
||
t: a.funcParams(cgn.obj),
|
||
result: a.funcResults(cgn.obj),
|
||
})
|
||
}
|
||
|
||
func ext۰reflect۰rtype۰Field(a *analysis, cgn *cgnode) {
|
||
// No-one ever calls Field with a constant argument,
|
||
// so we don't specialize that case.
|
||
a.addConstraint(&rtypeFieldByNameConstraint{
|
||
cgn: cgn,
|
||
t: a.funcParams(cgn.obj),
|
||
result: a.funcResults(cgn.obj),
|
||
})
|
||
}
|
||
|
||
func ext۰reflect۰rtype۰FieldByIndex(a *analysis, cgn *cgnode) {}
|
||
func ext۰reflect۰rtype۰FieldByNameFunc(a *analysis, cgn *cgnode) {}
|
||
|
||
// ---------- func (*rtype) In/Out(i int) Type ----------
|
||
|
||
// result = In/Out(t, i)
|
||
type rtypeInOutConstraint struct {
|
||
cgn *cgnode
|
||
t nodeid // (ptr)
|
||
result nodeid
|
||
out bool
|
||
i int // -ve if not a constant
|
||
}
|
||
|
||
func (c *rtypeInOutConstraint) String() string {
|
||
return fmt.Sprintf("n%d = (*reflect.rtype).InOut(n%d, %d)", c.result, c.t, c.i)
|
||
}
|
||
|
||
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()
|
||
}
|
||
for i, n := 0, tuple.Len(); i < n; i++ {
|
||
if c.i < 0 || c.i == 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) {
|
||
// If we have access to the callsite,
|
||
// and the argument is an int constant,
|
||
// return only that parameter.
|
||
index := -1
|
||
if site := cgn.callersite; site != nil {
|
||
if c, ok := site.instr.Common().Args[0].(*ssa.Const); ok {
|
||
v, _ := exact.Int64Val(c.Value)
|
||
index = int(v)
|
||
}
|
||
}
|
||
a.addConstraint(&rtypeInOutConstraint{
|
||
cgn: cgn,
|
||
t: a.funcParams(cgn.obj),
|
||
result: a.funcResults(cgn.obj),
|
||
out: out,
|
||
i: index,
|
||
})
|
||
}
|
||
|
||
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 (*rtype) Method(int) (Method, bool) ----------
|
||
// ---------- func (*rtype) MethodByName(string) (Method, bool) ----------
|
||
|
||
// result = MethodByName(t, name)
|
||
// result = Method(t, _)
|
||
type rtypeMethodByNameConstraint struct {
|
||
cgn *cgnode
|
||
name string // name of method; "" for unknown
|
||
t nodeid // (ptr)
|
||
result nodeid
|
||
}
|
||
|
||
func (c *rtypeMethodByNameConstraint) String() string {
|
||
return fmt.Sprintf("n%d = (*reflect.rtype).MethodByName(n%d, %q)", c.result, c.t, c.name)
|
||
}
|
||
|
||
func (c *rtypeMethodByNameConstraint) ptr() nodeid {
|
||
return c.t
|
||
}
|
||
|
||
// changeRecv returns sig with Recv prepended to Params().
|
||
func changeRecv(sig *types.Signature) *types.Signature {
|
||
params := sig.Params()
|
||
n := params.Len()
|
||
p2 := make([]*types.Var, n+1)
|
||
p2[0] = sig.Recv()
|
||
for i := 0; i < n; i++ {
|
||
p2[i+1] = params.At(i)
|
||
}
|
||
return types.NewSignature(nil, nil, types.NewTuple(p2...), sig.Results(), sig.IsVariadic())
|
||
}
|
||
|
||
func (c *rtypeMethodByNameConstraint) solve(a *analysis, _ *node, delta nodeset) {
|
||
for tObj := range delta {
|
||
T := a.nodes[tObj].obj.data.(types.Type)
|
||
|
||
// We don't use Lookup(c.name) when c.name != "" to avoid
|
||
// ambiguity: >1 unexported methods could match.
|
||
mset := T.MethodSet()
|
||
for i, n := 0, mset.Len(); i < n; i++ {
|
||
sel := mset.At(i)
|
||
if c.name == "" || c.name == sel.Obj().Name() {
|
||
// type Method struct {
|
||
// 0 __identity__
|
||
// 1 Name string
|
||
// 2 PkgPath string
|
||
// 3 Type Type
|
||
// 4 Func Value
|
||
// 5 Index int
|
||
// }
|
||
fn := a.prog.Method(sel)
|
||
|
||
// a.offsetOf(Type) is 3.
|
||
if id := c.result + 3; a.addLabel(id, a.makeRtype(changeRecv(fn.Signature))) {
|
||
a.addWork(id)
|
||
}
|
||
// a.offsetOf(Func) is 4.
|
||
if id := c.result + 4; a.addLabel(id, a.objectNode(nil, fn)) {
|
||
a.addWork(id)
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
func ext۰reflect۰rtype۰MethodByName(a *analysis, cgn *cgnode) {
|
||
// If we have access to the callsite,
|
||
// and the argument is a string constant,
|
||
// return only that method.
|
||
var name string
|
||
if site := cgn.callersite; site != nil {
|
||
if c, ok := site.instr.Common().Args[0].(*ssa.Const); ok {
|
||
name = exact.StringVal(c.Value)
|
||
}
|
||
}
|
||
|
||
a.addConstraint(&rtypeMethodByNameConstraint{
|
||
cgn: cgn,
|
||
name: name,
|
||
t: a.funcParams(cgn.obj),
|
||
result: a.funcResults(cgn.obj),
|
||
})
|
||
}
|
||
|
||
func ext۰reflect۰rtype۰Method(a *analysis, cgn *cgnode) {
|
||
// No-one ever calls Method with a constant argument,
|
||
// so we don't specialize that case.
|
||
a.addConstraint(&rtypeMethodByNameConstraint{
|
||
cgn: cgn,
|
||
t: a.funcParams(cgn.obj),
|
||
result: a.funcResults(cgn.obj),
|
||
})
|
||
}
|