Giant blob of minor changes

[dotfiles/.git] / .config / coc / extensions / coc-go-data / tools / pkg / mod / golang.org / x / tools@v0.0.0-20201028153306-37f0764111ff / go / analysis / passes / unmarshal / unmarshal.go

diff --git a/.config/coc/extensions/coc-go-data/tools/pkg/mod/golang.org/x/tools@v0.0.0-20201028153306-37f0764111ff/go/analysis/passes/unmarshal/unmarshal.go b/.config/coc/extensions/coc-go-data/tools/pkg/mod/golang.org/x/tools@v0.0.0-20201028153306-37f0764111ff/go/analysis/passes/unmarshal/unmarshal.go
new file mode 100644 (file)
index 0000000..92b37ca
--- /dev/null
+++ b/.config/coc/extensions/coc-go-data/tools/pkg/mod/golang.org/x/tools@v0.0.0-20201028153306-37f0764111ff/go/analysis/passes/unmarshal/unmarshal.go
@@ -0,0 +1,100 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// The unmarshal package defines an Analyzer that checks for passing
+// non-pointer or non-interface types to unmarshal and decode functions.
+package unmarshal
+
+import (
+       "go/ast"
+       "go/types"
+
+       "golang.org/x/tools/go/analysis"
+       "golang.org/x/tools/go/analysis/passes/inspect"
+       "golang.org/x/tools/go/ast/inspector"
+       "golang.org/x/tools/go/types/typeutil"
+)
+
+const Doc = `report passing non-pointer or non-interface values to unmarshal
+
+The unmarshal analysis reports calls to functions such as json.Unmarshal
+in which the argument type is not a pointer or an interface.`
+
+var Analyzer = &analysis.Analyzer{
+       Name:     "unmarshal",
+       Doc:      Doc,
+       Requires: []*analysis.Analyzer{inspect.Analyzer},
+       Run:      run,
+}
+
+func run(pass *analysis.Pass) (interface{}, error) {
+       switch pass.Pkg.Path() {
+       case "encoding/gob", "encoding/json", "encoding/xml", "encoding/asn1":
+               // These packages know how to use their own APIs.
+               // Sometimes they are testing what happens to incorrect programs.
+               return nil, nil
+       }
+
+       inspect := pass.ResultOf[inspect.Analyzer].(*inspector.Inspector)
+
+       nodeFilter := []ast.Node{
+               (*ast.CallExpr)(nil),
+       }
+       inspect.Preorder(nodeFilter, func(n ast.Node) {
+               call := n.(*ast.CallExpr)
+               fn := typeutil.StaticCallee(pass.TypesInfo, call)
+               if fn == nil {
+                       return // not a static call
+               }
+
+               // Classify the callee (without allocating memory).
+               argidx := -1
+               recv := fn.Type().(*types.Signature).Recv()
+               if fn.Name() == "Unmarshal" && recv == nil {
+                       // "encoding/json".Unmarshal
+                       // "encoding/xml".Unmarshal
+                       // "encoding/asn1".Unmarshal
+                       switch fn.Pkg().Path() {
+                       case "encoding/json", "encoding/xml", "encoding/asn1":
+                               argidx = 1 // func([]byte, interface{})
+                       }
+               } else if fn.Name() == "Decode" && recv != nil {
+                       // (*"encoding/json".Decoder).Decode
+                       // (* "encoding/gob".Decoder).Decode
+                       // (* "encoding/xml".Decoder).Decode
+                       t := recv.Type()
+                       if ptr, ok := t.(*types.Pointer); ok {
+                               t = ptr.Elem()
+                       }
+                       tname := t.(*types.Named).Obj()
+                       if tname.Name() == "Decoder" {
+                               switch tname.Pkg().Path() {
+                               case "encoding/json", "encoding/xml", "encoding/gob":
+                                       argidx = 0 // func(interface{})
+                               }
+                       }
+               }
+               if argidx < 0 {
+                       return // not a function we are interested in
+               }
+
+               if len(call.Args) < argidx+1 {
+                       return // not enough arguments, e.g. called with return values of another function
+               }
+
+               t := pass.TypesInfo.Types[call.Args[argidx]].Type
+               switch t.Underlying().(type) {
+               case *types.Pointer, *types.Interface:
+                       return
+               }
+
+               switch argidx {
+               case 0:
+                       pass.Reportf(call.Lparen, "call of %s passes non-pointer", fn.Name())
+               case 1:
+                       pass.Reportf(call.Lparen, "call of %s passes non-pointer as second argument", fn.Name())
+               }
+       })
+       return nil, nil
+}