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Copy pathflow.go
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1412 lines (1397 loc) · 52.7 KB
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package contracttrace
import (
"context"
"fmt"
"go/constant"
"go/token"
"go/types"
"sort"
"strings"
"golang.org/x/tools/go/callgraph"
"golang.org/x/tools/go/packages"
"golang.org/x/tools/go/ssa"
"golang.org/x/tools/go/ssa/ssautil"
)
// A bounded, monotone, context-insensitive value-flow model. Results are
// candidates: unsupported memory/dispatch and external callers remain boundaries.
const maxFlowValues = 64
type flowValue struct {
strings map[string]bool
functions map[*ssa.Function]bool
boundReceivers map[*ssa.Function]boundReceiverCandidates
boundReceiverUnknown bool
addresses map[string]bool
effects map[string]bool
errors map[string]bool
scalars map[string]bool
scalarUnknown bool
sqlUnknown bool
functionUnknown bool
functionNil bool
zeroAggregates map[types.Type]bool
zeroAggregateUnknown bool
mapNil bool
interfaceUnknown bool
stringUnknown bool
addressAlternatives map[string]typedAddressAlternative
addressAltUnknown bool
}
type typedAddressAlternative struct {
typ types.Type
zero bool
unknown bool
}
type boundReceiverCandidates struct {
addresses map[string]bool
typ types.Type
unknown bool
}
func emptyFlow() flowValue {
return flowValue{strings: map[string]bool{}, functions: map[*ssa.Function]bool{}, addresses: map[string]bool{}, effects: map[string]bool{}}
}
func captureBoundMethodReceiver(result *flowValue, target *ssa.Function, receiver flowValue, receiverType types.Type, enabled bool) {
if !enabled || target == nil || result == nil {
return
}
method, ok := target.Object().(*types.Func)
if !ok {
return
}
signature, ok := method.Type().(*types.Signature)
if !ok || signature.Recv() == nil {
return
}
result.boundReceivers = map[*ssa.Function]boundReceiverCandidates{
target: {addresses: snapshotCandidates(receiver.addresses), typ: receiverType, unknown: receiver.sqlUnknown || receiver.boundReceiverUnknown || receiver.interfaceUnknown},
}
}
func isBoundMethodTarget(target *ssa.Function) bool {
if target == nil {
return false
}
method, ok := target.Object().(*types.Func)
if !ok {
return false
}
signature, ok := method.Type().(*types.Signature)
return ok && signature.Recv() != nil
}
type flowAnalysis struct {
values map[ssa.Value]flowValue
memory map[string]flowValue
addressTypes map[string]types.Type
allocations map[string]*ssa.Alloc
zeroFunctionFields map[string]bool
zeroFunctionFieldCache map[string]uint8
zeroFunctionElements map[string]bool
knownFunctionElements map[string]bool
zeroFunctionArrayElements map[string]bool
unknownFunctionElements map[string]bool
zeroFunctionArrayCache map[string]uint8
globalFunctionStates map[string]globalFunctionState
channelClosures *channelClosureIndex
aliasVersions map[string]uint64
recordCache map[ssa.Value]recordAddressCache
mapEntries map[string]map[string]bool
mapClosed map[string]bool
mapOpen map[string]bool
returns map[*ssa.Function][]flowValue
positions map[token.Pos]flowValue
callTargets map[token.Pos]flowValue
coverage FlowCoverage
special map[*ssa.Call][]flowValue
contexts map[ssa.CallInstruction]contextSite
contextKeys map[string]contextSite
doneChannels map[string]string
invokes map[*ssa.CallCommon]map[*ssa.Function]bool
sqlHandles map[string]sqlHandle
statementExecutions map[token.Pos]map[string]flowValue
sqlOperations map[token.Pos]map[string]bool
sqlReceivers map[token.Pos]flowValue
sqlCalls map[token.Pos]map[string]sqlSemanticCall
callbackEscapes map[ssa.CallInstruction]map[*ssa.Function]bool
callbackReturns map[*ssa.Return]map[*ssa.Function]bool
publicGlobals []*ssa.Global
localGlobals []*ssa.Global
globalAddressOwners map[string]map[string]bool
globalCallbacks map[*ssa.Global]map[*ssa.Function]bool
globalSQLFields map[*ssa.Global]bool
iterators map[string]iteratorSummary
inputRoots map[string]bool
interfaceAssertions map[ssa.Value]bool
memoryVersions map[string]uint64
callbackCache map[ssa.Value]*callbackStorageCache
afterFuncs map[string]afterFuncSite
afterFuncSchedulers map[string]*ssa.Function
afterFuncTypeCache map[types.Type]string
scalarControls map[*ssa.BasicBlock][]*ssa.If
scalarControlCache map[*ssa.BasicBlock]flowValue
lifecycleMatched map[string]bool
lifecycleTypes []types.Type
}
func (a *flowAnalysis) addGlobalFunctionState(result *flowValue, address string, ix *index) {
if result == nil || a == nil || !strings.HasPrefix(address, "global:") {
return
}
if a.globalFunctionStates == nil {
a.globalFunctionStates = map[string]globalFunctionState{}
}
state, cached := a.globalFunctionStates[address]
if !cached {
state = a.globalFunctionStateAtAddress(address, ix)
a.globalFunctionStates[address] = state
}
switch state {
case globalFunctionZero:
result.functionNil = true
case globalFunctionUnknown:
result.functionUnknown = true
}
}
func aggregateSequenceStorageType(sequenceType types.Type, address string, addressTypes map[string]types.Type) types.Type {
if sequenceType == nil {
return nil
}
sequenceType = types.Unalias(sequenceType)
if pointer, ok := sequenceType.Underlying().(*types.Pointer); ok {
sequenceType = types.Unalias(pointer.Elem())
}
if _, ok := sequenceType.Underlying().(*types.Array); ok {
return sequenceType
}
if _, ok := sequenceType.Underlying().(*types.Slice); !ok {
return nil
}
addressType := addressTypes[address]
if addressType == nil {
return nil
}
storage := types.Unalias(addressType)
pointer, ok := storage.Underlying().(*types.Pointer)
if !ok {
return nil
}
if _, ok := types.Unalias(pointer.Elem()).Underlying().(*types.Array); !ok {
return nil
}
return pointer.Elem()
}
func aggregateSelectedElement(a *flowAnalysis, value flowValue, sequenceType types.Type, address string) flowValue {
result := emptyFlow()
if a == nil {
return result
}
storageType := aggregateSequenceStorageType(sequenceType, address, a.addressTypes)
if storageType == nil {
return result
}
a.merge(&result, a.zeroAggregateIndex(value, storageType))
return result
}
func (a *flowAnalysis) merge(dst *flowValue, src flowValue) bool {
changed := false
if dst.strings == nil {
unknown := dst.sqlUnknown
unknownFunction := dst.functionUnknown
nilFunction := dst.functionNil
unknownInterface := dst.interfaceUnknown
nilMap := dst.mapNil
unknownString := dst.stringUnknown
errorOrigins := dst.errors
scalarOrigins, unknownScalar := dst.scalars, dst.scalarUnknown
boundReceivers, unknownBoundReceiver := dst.boundReceivers, dst.boundReceiverUnknown
zeroAggregates, unknownZeroAggregate := dst.zeroAggregates, dst.zeroAggregateUnknown
addressAlternatives, unknownAddressAlternative := dst.addressAlternatives, dst.addressAltUnknown
*dst = emptyFlow()
dst.sqlUnknown = unknown
dst.functionUnknown = unknownFunction
dst.functionNil = nilFunction
dst.interfaceUnknown = unknownInterface
dst.mapNil = nilMap
dst.stringUnknown = unknownString
dst.errors = errorOrigins
dst.scalars, dst.scalarUnknown = scalarOrigins, unknownScalar
dst.boundReceivers, dst.boundReceiverUnknown = boundReceivers, unknownBoundReceiver
dst.zeroAggregates, dst.zeroAggregateUnknown = zeroAggregates, unknownZeroAggregate
dst.addressAlternatives, dst.addressAltUnknown = addressAlternatives, unknownAddressAlternative
}
if src.scalarUnknown && !dst.scalarUnknown {
dst.scalarUnknown = true
changed = true
}
for _, origin := range mergeKeys(src.scalars, dst.scalars) {
if dst.scalars[origin] {
continue
}
if len(dst.scalars) >= maxFlowValues {
a.coverage.Widened = true
if !dst.scalarUnknown {
dst.scalarUnknown = true
changed = true
}
continue
}
if dst.scalars == nil {
dst.scalars = map[string]bool{}
}
dst.scalars[origin] = true
changed = true
}
if src.sqlUnknown && !dst.sqlUnknown {
dst.sqlUnknown = true
changed = true
}
if src.functionUnknown && !dst.functionUnknown {
dst.functionUnknown = true
changed = true
}
if src.functionNil && !dst.functionNil {
dst.functionNil = true
changed = true
}
if src.zeroAggregateUnknown && !dst.zeroAggregateUnknown {
dst.zeroAggregateUnknown = true
changed = true
}
if src.mapNil && !dst.mapNil {
dst.mapNil = true
changed = true
}
if src.addressAltUnknown && !dst.addressAltUnknown {
dst.addressAltUnknown = true
changed = true
}
for _, address := range sortedKeys(src.addressAlternatives) {
incoming := src.addressAlternatives[address]
changed = a.addTypedAddressAlternative(dst, address, incoming.typ, incoming.zero, incoming.unknown) || changed
}
zeroTypes := make([]types.Type, 0, len(src.zeroAggregates))
for typ := range src.zeroAggregates {
zeroTypes = append(zeroTypes, typ)
}
sort.Slice(zeroTypes, func(i, j int) bool { return types.TypeString(zeroTypes[i], nil) < types.TypeString(zeroTypes[j], nil) })
for _, typ := range zeroTypes {
if dst.zeroAggregates[typ] {
continue
}
if len(dst.zeroAggregates) >= maxFlowValues {
a.coverage.Widened = true
if !dst.zeroAggregateUnknown {
dst.zeroAggregateUnknown = true
changed = true
}
continue
}
if dst.zeroAggregates == nil {
dst.zeroAggregates = map[types.Type]bool{}
}
dst.zeroAggregates[typ] = true
changed = true
}
if src.interfaceUnknown && !dst.interfaceUnknown {
dst.interfaceUnknown = true
changed = true
}
if src.stringUnknown && !dst.stringUnknown {
dst.stringUnknown = true
changed = true
}
for _, origin := range mergeKeys(src.errors, dst.errors) {
if !dst.errors[origin] {
if len(dst.errors) >= maxFlowValues {
a.coverage.Widened = true
continue
}
if dst.errors == nil {
dst.errors = map[string]bool{}
}
dst.errors[origin] = true
changed = true
}
}
for _, s := range mergeKeys(src.strings, dst.strings) {
if !dst.strings[s] {
if len(dst.strings) >= maxFlowValues {
a.coverage.Widened = true
if !dst.stringUnknown {
dst.stringUnknown = true
changed = true
}
continue
}
dst.strings[s] = true
changed = true
}
}
for _, f := range mergeFunctions(src.functions, dst.functions) {
if !dst.functions[f] {
if len(dst.functions) >= maxFlowValues {
a.coverage.Widened = true
continue
}
dst.functions[f] = true
changed = true
}
}
if len(src.boundReceivers) > 0 || src.boundReceiverUnknown {
boundFunctionSet := make(map[*ssa.Function]bool, len(src.boundReceivers))
for fn := range src.boundReceivers {
boundFunctionSet[fn] = true
}
boundFunctions := sortedFunctions(boundFunctionSet)
if src.boundReceiverUnknown && !dst.boundReceiverUnknown {
dst.boundReceiverUnknown = true
changed = true
}
for _, fn := range boundFunctions {
receivers := src.boundReceivers[fn]
current, exists := dst.boundReceivers[fn]
if !exists && len(dst.boundReceivers) >= maxFlowValues {
a.coverage.Widened = true
if !dst.boundReceiverUnknown {
dst.boundReceiverUnknown = true
changed = true
}
continue
}
localChanged := false
if current.typ == nil && receivers.typ != nil {
current.typ = receivers.typ
localChanged = true
} else if current.typ != nil && receivers.typ != nil && !types.Identical(current.typ, receivers.typ) && !current.unknown {
current.unknown = true
localChanged = true
}
if current.addresses == nil {
current.addresses = map[string]bool{}
}
for _, address := range sortedKeys(receivers.addresses) {
if current.addresses[address] {
continue
}
if len(current.addresses) >= maxFlowValues {
a.coverage.Widened = true
if !current.unknown {
current.unknown = true
localChanged = true
}
continue
}
current.addresses[address] = true
localChanged = true
}
if receivers.unknown && !current.unknown {
current.unknown = true
localChanged = true
}
if dst.boundReceivers == nil {
dst.boundReceivers = map[*ssa.Function]boundReceiverCandidates{}
}
if !exists || localChanged {
dst.boundReceivers[fn] = current
changed = changed || !exists || localChanged
}
}
}
for _, p := range mergeKeys(src.addresses, dst.addresses) {
if !dst.addresses[p] {
if len(dst.addresses) >= maxFlowValues {
a.coverage.Widened = true
continue
}
dst.addresses[p] = true
changed = true
}
}
for _, effect := range mergeKeys(src.effects, dst.effects) {
if !dst.effects[effect] {
if len(dst.effects) >= maxFlowValues {
a.coverage.Widened = true
continue
}
dst.effects[effect] = true
changed = true
}
}
return changed
}
func (a *flowAnalysis) get(v ssa.Value) flowValue {
if v != nil {
switch v.(type) {
case *ssa.Const, *ssa.Function, *ssa.Global:
// These values add intrinsic candidates before bounded merging.
default:
stored := a.values[v]
if len(stored.strings) <= maxFlowValues && len(stored.functions) <= maxFlowValues && len(stored.addresses) <= maxFlowValues && len(stored.boundReceivers) <= maxFlowValues && len(stored.effects) <= maxFlowValues && len(stored.errors) <= maxFlowValues && len(stored.scalars) <= maxFlowValues && len(stored.zeroAggregates) <= maxFlowValues && len(stored.addressAlternatives) <= maxFlowValues {
return snapshotFlow(stored)
}
}
}
result := emptyFlow()
if v == nil {
return result
}
switch x := v.(type) {
case *ssa.Const:
if x.IsNil() && x.Type() != nil {
if _, ok := types.Unalias(x.Type()).Underlying().(*types.Map); ok {
result.mapNil = true
}
}
if x.IsNil() && isSQLHandleType(x.Type()) {
result.sqlUnknown = true
}
if x.IsNil() && isFunctionType(x.Type()) {
result.functionNil = true
}
if x.Value != nil && x.Value.Kind() == constant.String {
result.strings[constant.StringVal(x.Value)] = true
}
case *ssa.Function:
result.functions[x] = true
case *ssa.Global:
result.addresses["global:"+x.String()] = true
}
a.merge(&result, a.values[v])
return result
}
func (a *flowAnalysis) put(v ssa.Value, f flowValue) bool {
old := a.values[v]
changed := a.merge(&old, f)
a.values[v] = old
return changed
}
func (ix *index) registerInitializers(prog *ssa.Program, pkgs []*packages.Package) {
ix.ssaOwners = map[*ssa.Function]string{}
for _, p := range pkgs {
sp := prog.Package(p.Types)
if sp == nil || len(p.Syntax) == 0 {
continue
}
fn, ok := sp.Members["init"].(*ssa.Function)
if !ok {
continue
}
evidence := ix.evidence(p.Syntax[0].Pos())
id := p.PkgPath + "::(package init)"
ix.ssaOwners[fn] = id
ix.funcs[id] = &function{node: Node{ID: id, Name: "(package init)", Kind: "initializer", Evidence: evidence}, pkg: p}
}
}
func (ix *index) analyzeFlow(ctx context.Context, prog *ssa.Program, graph *callgraph.Graph, config Config) (*flowAnalysis, error) {
a := &flowAnalysis{values: map[ssa.Value]flowValue{}, memory: map[string]flowValue{}, addressTypes: map[string]types.Type{}, returns: map[*ssa.Function][]flowValue{}, positions: map[token.Pos]flowValue{}, mapOpen: map[string]bool{}, coverage: FlowCoverage{MaxValues: maxFlowValues}}
if len(config.CallRules) > 0 {
a.callTargets = map[token.Pos]flowValue{}
}
a.invokes = map[*ssa.CallCommon]map[*ssa.Function]bool{}
for fn, node := range graph.Nodes {
if ix.owner(fn) == "" {
continue
}
for _, edge := range node.Out {
if edge.Site == nil || !edge.Site.Common().IsInvoke() {
continue
}
common := edge.Site.Common()
if a.invokes[common] == nil {
a.invokes[common] = map[*ssa.Function]bool{}
}
a.invokes[common][edge.Callee.Func] = true
}
}
for _, p := range prog.AllPackages() {
for _, member := range p.Members {
if global, ok := member.(*ssa.Global); ok {
a.addressTypes["global:"+global.String()] = global.Type()
if variable, ok := global.Object().(*types.Var); ok {
if _, inside := relative(ix.root, ix.fset.Position(global.Pos()).Filename); inside {
a.localGlobals = append(a.localGlobals, global)
}
if _, inside := relative(ix.root, ix.fset.Position(global.Pos()).Filename); inside && variable.Exported() {
a.publicGlobals = append(a.publicGlobals, global)
if sqlHandleGlobal(global) {
unknown := emptyFlow()
unknown.sqlUnknown = true
a.store("global:"+global.String(), unknown)
}
}
if text, present := ix.embedded[variable]; present {
value := emptyFlow()
value.strings[text] = true
a.memory["global:"+global.String()] = value
}
}
}
}
}
sort.Slice(a.publicGlobals, func(i, j int) bool { return a.publicGlobals[i].String() < a.publicGlobals[j].String() })
funcs := []*ssa.Function{}
for fn := range ssautil.AllFunctions(prog) {
a.collectLifecycleTypes(fn, config)
if ix.owner(fn) != "" && len(fn.Blocks) > 0 {
funcs = append(funcs, fn)
}
}
sort.Slice(funcs, func(i, j int) bool { return funcs[i].String() < funcs[j].String() })
a.channelClosures = newChannelClosureIndex(funcs)
a.seedErrorResults(funcs, ix)
a.seedScalarParameters(funcs, ix)
a.seedScalarBuiltinResults(funcs, ix)
a.seedScalarControl(funcs, ix)
a.afterFuncSchedulers = map[string]*ssa.Function{}
for _, fn := range funcs {
if cancellationSchedulerSignature(fn) {
id := ix.owner(fn)
if previous := a.afterFuncSchedulers[id]; previous == nil || previous.Synthetic != "" && fn.Synthetic == "" {
a.afterFuncSchedulers[id] = fn
}
}
}
a.seedSQLInputs(funcs, ix, false)
a.seedFunctionInputs(funcs, ix, false)
a.seedErrorInputs(funcs, ix, false)
for _, function := range funcs {
if function.Object() != nil && function.Object().Exported() {
for _, parameter := range function.Params {
a.seedAggregateInput(parameter, ix)
}
}
}
uncalledInputsSeeded := false
for round := 0; round < 100; round++ {
// Control predicates can acquire origins during this round. Recompute
// summaries next round, while sharing them across instructions here.
a.scalarControlCache = map[*ssa.BasicBlock]flowValue{}
if err := ctx.Err(); err != nil {
return nil, err
}
changed := false
for _, fn := range funcs {
for _, block := range fn.Blocks {
for _, instruction := range block.Instrs {
result := emptyFlow()
switch v := instruction.(type) {
case *ssa.MakeMap:
address := ix.allocationID("map", fn, v)
result.addresses[address] = true
a.addressTypes[address] = v.Type()
if a.mapClosed == nil {
a.mapClosed = map[string]bool{}
}
a.mapClosed[address] = true
case *ssa.MakeSlice:
address := ix.allocationID("slice", fn, v)
result.addresses[address] = true
a.addressTypes[address] = v.Type()
if slice, ok := types.Unalias(v.Type()).Underlying().(*types.Slice); ok && isFunctionType(slice.Elem()) {
elementAddress := address + ".element"
state := makeSliceFunctionElements(fn, v, ix)
cacheSequenceElement(a, elementAddress, state)
if state == functionElementUnsupported {
if a.unknownFunctionElements == nil {
a.unknownFunctionElements = map[string]bool{}
}
a.unknownFunctionElements[elementAddress] = true
}
} else if slice, ok := types.Unalias(v.Type()).Underlying().(*types.Slice); ok && inlineAggregate(slice.Elem()) {
state := makeSliceFunctionElements(fn, v, ix)
switch state {
case functionElementMayBeZero:
a.addZeroAggregate(&result, slice.Elem())
case functionElementUnsupported:
a.markZeroAggregateUnknown(&result)
}
}
case *ssa.MakeChan:
result.addresses[ix.channelID(v.Pos())] = true
case *ssa.MapUpdate:
stored := a.get(v.Value)
if isScalarType(v.Value.Type()) {
a.mergeScalar(&stored, a.scalarControlValue(block))
}
for _, p := range sortedKeys(a.get(v.Map).addresses) {
if a.mapUpdateOpens(fn, v, ix) && a.openMap(p) {
changed = true
}
if a.store(p+".keys", a.get(v.Key)) {
changed = true
}
for _, key := range a.mapKeys(v.Key) {
if a.storeMap(p, key, stored) {
changed = true
}
}
}
case *ssa.Lookup:
result = a.mapLookup(v.X, v.Index)
case *ssa.Range:
if _, ok := v.X.Type().Underlying().(*types.Map); ok {
a.merge(&result, a.get(v.X))
}
case *ssa.Send:
if a.send(v.Chan, v.X, block) {
changed = true
}
case *ssa.Select:
for _, state := range v.States {
if state.Dir == types.SendOnly && a.send(state.Chan, state.Send, block) {
changed = true
}
}
case *ssa.Alloc:
address := ix.allocationID("alloc", fn, v)
result.addresses[address] = true
a.addressTypes[address] = v.Type()
if a.allocations == nil {
a.allocations = map[string]*ssa.Alloc{}
}
a.allocations[address] = v
if pointer, ok := v.Type().Underlying().(*types.Pointer); ok && inlineAggregate(pointer.Elem()) {
if owner := ix.funcs[ix.owner(fn)]; owner != nil && owner.pkg != nil {
initializer, found := allocationInitializer(fn, v, pointer.Elem(), owner.pkg, ix)
if found && initializer.zero {
a.addZeroAggregate(&result, pointer.Elem())
} else if found && initializer.literal != nil {
if array, ok := types.Unalias(pointer.Elem()).Underlying().(*types.Array); ok && inlineAggregate(array.Elem()) && arrayLiteralHasOmittedElements(initializer.literal, array, owner.pkg) {
a.addZeroAggregate(&result, pointer.Elem())
}
} else if state, recognized := sliceBackingAllocationState(fn, v, owner.pkg); recognized && state == functionElementMayBeZero {
a.addZeroAggregate(&result, pointer.Elem())
}
}
}
if pointer, ok := v.Type().Underlying().(*types.Pointer); ok {
if array, ok := pointer.Elem().Underlying().(*types.Array); ok && isFunctionType(array.Elem()) {
elementAddress := address + ".element"
state := a.zeroFunctionArrayAtAddress(address, ix)
if state == functionElementUnsupported {
if a.unknownFunctionElements == nil {
a.unknownFunctionElements = map[string]bool{}
}
a.unknownFunctionElements[elementAddress] = true
} else {
cacheSequenceElement(a, elementAddress, state)
if state == functionElementMayBeZero {
if a.zeroFunctionArrayElements == nil {
a.zeroFunctionArrayElements = map[string]bool{}
}
a.zeroFunctionArrayElements[elementAddress] = true
}
}
}
}
case *ssa.Phi:
for _, edge := range v.Edges {
a.merge(&result, a.get(edge))
}
case *ssa.ChangeType:
a.merge(&result, a.get(v.X))
a.merge(&result, a.retypeZeroAggregate(a.get(v.X), v.X.Type(), v.Type()))
retypeAddressAlternatives(&result, v.X.Type(), v.Type())
case *ssa.Convert:
a.merge(&result, a.get(v.X))
a.merge(&result, a.retypeZeroAggregate(a.get(v.X), v.X.Type(), v.Type()))
retypeAddressAlternatives(&result, v.X.Type(), v.Type())
case *ssa.ChangeInterface:
a.merge(&result, a.get(v.X))
case *ssa.MakeInterface:
a.merge(&result, a.get(v.X))
a.modelWaitGroupInterface(v.X, &result)
a.modelAfterFuncInterface(v.X, &result)
case *ssa.TypeAssert:
a.merge(&result, a.get(v.X))
if !v.CommaOk && a.get(v.X).interfaceUnknown && a.seedInterfaceAssertion(v, v, ix) {
changed = true
}
case *ssa.FieldAddr:
parentType := types.Unalias(v.X.Type())
if pointer, ok := parentType.Underlying().(*types.Pointer); ok {
parentType = types.Unalias(pointer.Elem())
}
var childType types.Type
if structure, ok := types.Unalias(parentType).Underlying().(*types.Struct); ok && v.Field >= 0 && v.Field < structure.NumFields() {
childType = structure.Field(v.Field).Type()
}
legacyChildProjection := isFunctionType(childType) || inlineAggregate(childType)
addressPayload := carriesTypedAddressAlternative(childType)
parentValue := a.get(v.X)
if inlineAggregate(parentType) && legacyChildProjection {
a.merge(&result, a.zeroAggregateField(parentValue, parentType, v.Field))
}
for _, p := range a.recordAddresses(v.X) {
address := fmt.Sprintf("%s.field:%d", p, v.Field)
if inlineAggregate(parentType) {
for _, source := range []flowValue{parentValue, a.memory[p]} {
if legacyChildProjection {
a.merge(&result, a.zeroAggregateField(source, parentType, v.Field))
}
if addressPayload {
if pointer, ok := types.Unalias(v.Type()).Underlying().(*types.Pointer); ok {
a.addTypedAddressAlternative(&result, address, pointer.Elem(), exactZeroAggregateMatches(source, parentType), source.zeroAggregateUnknown)
}
}
}
}
result.addresses[address] = true
if pointer, ok := v.Type().Underlying().(*types.Pointer); ok && isFunctionType(pointer.Elem()) && a.zeroFunctionFieldAtAddress(address, ix) {
if a.zeroFunctionFields == nil {
a.zeroFunctionFields = map[string]bool{}
}
a.zeroFunctionFields[address] = true
}
if pointer, ok := v.Type().Underlying().(*types.Pointer); ok && isFunctionType(pointer.Elem()) {
a.addGlobalFunctionState(&result, address, ix)
}
}
case *ssa.IndexAddr:
_, parentArray := types.Unalias(v.X.Type()).Underlying().(*types.Array)
pointerArray := aggregateSequenceStorageType(v.X.Type(), "", nil) != nil && !parentArray
var childType types.Type
if pointer, ok := types.Unalias(v.Type()).Underlying().(*types.Pointer); ok {
childType = pointer.Elem()
}
legacyChildProjection := isFunctionType(childType) || inlineAggregate(childType)
addressPayload := carriesTypedAddressAlternative(childType)
sequenceValue := a.get(v.X)
for _, p := range a.recordAddresses(v.X) {
address := p + ".element"
result.addresses[address] = true
if pointerArray {
for _, source := range []flowValue{sequenceValue, a.memory[p]} {
projected := aggregateSelectedElement(a, source, v.X.Type(), p)
if legacyChildProjection {
a.merge(&result, projected)
}
storageType := aggregateSequenceStorageType(v.X.Type(), p, a.addressTypes)
if addressPayload && storageType != nil {
if pointer, ok := types.Unalias(v.Type()).Underlying().(*types.Pointer); ok {
a.addTypedAddressAlternative(&result, address, pointer.Elem(), exactZeroAggregateMatches(source, storageType), source.zeroAggregateUnknown)
}
}
}
}
if parentArray {
if pointer, ok := types.Unalias(v.Type()).Underlying().(*types.Pointer); ok {
storageType := types.Unalias(v.X.Type())
for _, source := range []flowValue{sequenceValue, a.memory[p]} {
projected := aggregateSelectedElement(a, source, v.X.Type(), p)
if legacyChildProjection {
a.merge(&result, projected)
}
if addressPayload {
a.addTypedAddressAlternative(&result, address, pointer.Elem(), exactZeroAggregateMatches(source, storageType), source.zeroAggregateUnknown)
}
}
}
}
if pointer, ok := v.Type().Underlying().(*types.Pointer); ok && inlineAggregate(pointer.Elem()) && !parentArray {
a.merge(&result, aggregateSelectedElement(a, sequenceValue, v.X.Type(), p))
}
if pointer, ok := v.Type().Underlying().(*types.Pointer); ok && isFunctionType(pointer.Elem()) {
a.merge(&result, a.functionElementValue(v.X, p, address, ix))
}
}
if parentArray && legacyChildProjection {
projected := aggregateSelectedElement(a, sequenceValue, v.X.Type(), "")
a.merge(&result, projected)
}
if pointer, ok := v.Type().Underlying().(*types.Pointer); ok && inlineAggregate(pointer.Elem()) {
sequence, isSlice := types.Unalias(v.X.Type()).Underlying().(*types.Slice)
if isSlice {
marker := a.get(v.X)
if exactZeroAggregateMatches(marker, sequence.Elem()) {
a.addZeroAggregate(&result, sequence.Elem())
}
if marker.zeroAggregateUnknown {
a.markZeroAggregateUnknown(&result)
}
}
}
case *ssa.Index:
_, parentArray := types.Unalias(v.X.Type()).Underlying().(*types.Array)
pointerArray := aggregateSequenceStorageType(v.X.Type(), "", nil) != nil && !parentArray
for _, p := range a.recordAddresses(v.X) {
address := p + ".element"
a.merge(&result, a.memory[address])
if pointerArray {
a.merge(&result, aggregateSelectedElement(a, a.get(v.X), v.X.Type(), p))
a.merge(&result, aggregateSelectedElement(a, a.memory[p], v.X.Type(), p))
}
if isFunctionType(v.Type()) {
a.merge(&result, a.functionElementValue(v.X, p, address, ix))
}
if inlineAggregate(v.Type()) {
result.addresses[address] = true
if !parentArray {
a.merge(&result, aggregateSelectedElement(a, a.get(v.X), v.X.Type(), p))
}
}
}
if parentArray {
a.merge(&result, aggregateSelectedElement(a, a.get(v.X), v.X.Type(), ""))
}
if inlineAggregate(v.Type()) {
if sequence, ok := types.Unalias(v.X.Type()).Underlying().(*types.Slice); ok {
marker := a.get(v.X)
if exactZeroAggregateMatches(marker, sequence.Elem()) {
a.addZeroAggregate(&result, sequence.Elem())
}
if marker.zeroAggregateUnknown {
a.markZeroAggregateUnknown(&result)
}
}
}
case *ssa.Slice:
a.merge(&result, a.get(v.X))
case *ssa.Field:
parentType := types.Unalias(v.X.Type())
if pointer, ok := parentType.Underlying().(*types.Pointer); ok {
parentType = types.Unalias(pointer.Elem())
}
if inlineAggregate(parentType) {
a.merge(&result, a.zeroAggregateField(a.get(v.X), parentType, v.Field))
}
for _, p := range a.recordAddresses(v.X) {
address := fmt.Sprintf("%s.field:%d", p, v.Field)
if inlineAggregate(parentType) {
a.merge(&result, a.zeroAggregateField(a.get(v.X), parentType, v.Field))
a.merge(&result, a.zeroAggregateField(a.memory[p], parentType, v.Field))
}
a.merge(&result, a.memory[address])
if isFunctionType(v.Type()) && a.zeroFunctionFieldAtAddress(address, ix) {
result.functionNil = true
}
if isFunctionType(v.Type()) {
a.addGlobalFunctionState(&result, address, ix)
}
if inlineAggregate(v.Type()) {
result.addresses[address] = true
}
}
case *ssa.Store:
stored := a.get(v.Val)
if isScalarType(v.Val.Type()) {
a.mergeScalar(&stored, a.scalarControlValue(block))
}
for _, p := range sortedKeys(a.get(v.Addr).addresses) {
if a.store(p, stored) {
changed = true
}
}
case *ssa.UnOp:
if v.Op == token.SUB || v.Op == token.NOT || v.Op == token.XOR {
a.mergeScalar(&result, a.get(v.X))
}
if v.Op == token.ARROW {
result, _, _ = a.receiveWithClosedChannelValue(v.X, a.channelClosures)
}
if v.Op == token.MUL {
pointerValue := a.get(v.X)
for _, p := range sortedKeys(a.get(v.X).addresses) {
a.merge(&result, a.memory[p])
a.projectTypedAddressAlternative(&result, pointerValue, p, v.Type())
if isFunctionType(v.Type()) {
a.addGlobalFunctionState(&result, p, ix)
if a.zeroFunctionFields[p] || a.zeroFunctionArrayElements[p] || a.get(v.X).functionNil {
result.functionNil = true
}
if a.unknownFunctionElements[p] || a.get(v.X).functionUnknown {
result.functionUnknown = true
}
}
if inlineAggregate(v.Type()) {
result.addresses[p] = true
value := a.get(v.X)
if exactZeroAggregateMatches(value, v.Type()) {
a.addZeroAggregate(&result, v.Type())
}
if value.zeroAggregateUnknown {
a.markZeroAggregateUnknown(&result)
}
}
}
propagateIndirectAlternative(&result, pointerValue, v.Type())
}
case *ssa.BinOp:
a.mergeScalar(&result, a.get(v.X))
a.mergeScalar(&result, a.get(v.Y))
if v.Op == token.ADD {
left, right := a.get(v.X), a.get(v.Y)
result.stringUnknown = left.stringUnknown || right.stringUnknown
for _, x := range sortedKeys(left.strings) {
for _, y := range sortedKeys(right.strings) {
one := emptyFlow()
if len(x+y) <= 8192 {
one.strings[x+y] = true
} else {
a.coverage.Widened = true
}
a.merge(&result, one)
}
}
}
case *ssa.MakeClosure:
target := v.Fn.(*ssa.Function)
result.functions[target] = true
if len(v.Bindings) > 0 {
if method, ok := isSQLHandleMethodTarget(target); ok {
receiver := a.get(v.Bindings[0])
projected, selected, status := a.projectMethodExpressionReceiver(receiver, v.Bindings[0].Type(), method)
if status == methodReceiverProjectionUnsupported {
projected = unresolvedProjectedReceiver()
}
receiverType := v.Bindings[0].Type()
if selected != nil && selected.Recv() != nil {
receiverType = selected.Recv().Type()
}
captureBoundMethodReceiver(&result, target, projected, receiverType, true)
} else if method, ok := target.Object().(*types.Func); ok && (contextAdapterName(method) == "Done" || contextAdapterName(method) == "Err") && contextSelectedMethod(v.Bindings[0].Type(), contextAdapterName(method)) != nil {
method = contextSelectedMethod(v.Bindings[0].Type(), contextAdapterName(method))
receiver := a.get(v.Bindings[0])
projected, selected, status := a.projectMethodExpressionReceiver(receiver, v.Bindings[0].Type(), method)
if status == methodReceiverProjectionUnsupported {
projected = unresolvedProjectedReceiver()
}
receiverType := v.Bindings[0].Type()
if selected != nil && selected.Recv() != nil {
receiverType = selected.Recv().Type()
}
captureBoundMethodReceiver(&result, target, projected, receiverType, true)
} else if len(config.CallRules) > 0 {
captureBoundMethodReceiver(&result, target, a.get(v.Bindings[0]), v.Bindings[0].Type(), true)
} else if isBoundMethodTarget(target) && callbackTargetOutside(target, ix) && callbackStorageType(v.Bindings[0].Type(), map[types.Type]bool{}) {
captureBoundMethodReceiver(&result, target, a.get(v.Bindings[0]), v.Bindings[0].Type(), true)
}
}
a.modelWaitGroupBinding(v, &result)
a.modelLifecycleBinding(v, &result, config)
for i, binding := range v.Bindings {
if i < len(target.FreeVars) && a.put(target.FreeVars[i], a.get(binding)) {
changed = true
}
}
case *ssa.Extract:
if assertion, ok := v.Tuple.(*ssa.TypeAssert); ok && v.Index == 0 && a.get(assertion.X).interfaceUnknown && a.seedInterfaceAssertion(v, assertion, ix) {
changed = true
}
if call, ok := v.Tuple.(*ssa.Call); ok && a.seedAggregateResult(v, call, ix, false) {
changed = true
}
if call, ok := v.Tuple.(*ssa.Call); ok && isFunctionType(v.Type()) && a.outsideFunctionResult(call, ix) {
result.functionUnknown = true
}
if call, ok := v.Tuple.(*ssa.Call); ok && isSQLHandleType(v.Type()) && a.special[call] == nil && a.sqlExternalResult(call.Common(), ix) {
result.sqlUnknown = true
}