.config/coc/extensions/coc-go-data/tools/pkg/mod/honnef.co/go/tools@v0.0.1-2020.1.5/ir/stdlib_test.go

   1 // Copyright 2013 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 //lint:file-ignore SA1019 go/ssa's test suite is built around the deprecated go/loader. We'll leave fixing that to upstream.
   6
   7 // Incomplete source tree on Android.
   8
   9 // +build !android
  10
  11 package ir_test
  12
  13 // This file runs the IR builder in sanity-checking mode on all
  14 // packages beneath $GOROOT and prints some summary information.
  15 //
  16 // Run with "go test -cpu=8 to" set GOMAXPROCS.
  17
  18 import (
  19         "go/ast"
  20         "go/token"
  21         "runtime"
  22         "testing"
  23         "time"
  24
  25         "golang.org/x/tools/go/packages"
  26         "honnef.co/go/tools/ir"
  27         "honnef.co/go/tools/ir/irutil"
  28 )
  29
  30 func bytesAllocated() uint64 {
  31         runtime.GC()
  32         var stats runtime.MemStats
  33         runtime.ReadMemStats(&stats)
  34         return stats.TotalAlloc
  35 }
  36
  37 func TestStdlib(t *testing.T) {
  38         if testing.Short() {
  39                 t.Skip("skipping in short mode; too slow (golang.org/issue/14113)")
  40         }
  41
  42         var (
  43                 numFuncs  int
  44                 numInstrs int
  45
  46                 dLoad   time.Duration
  47                 dCreate time.Duration
  48                 dBuild  time.Duration
  49
  50                 allocLoad  uint64
  51                 allocBuild uint64
  52         )
  53
  54         // Load, parse and type-check the program.
  55         t0 := time.Now()
  56         alloc0 := bytesAllocated()
  57
  58         cfg := &packages.Config{
  59                 Mode: packages.NeedName | packages.NeedFiles | packages.NeedCompiledGoFiles | packages.NeedImports | packages.NeedDeps | packages.NeedTypes | packages.NeedSyntax | packages.NeedTypesInfo | packages.NeedTypesSizes,
  60         }
  61         pkgs, err := packages.Load(cfg, "std")
  62         if err != nil {
  63                 t.Fatalf("Load failed: %v", err)
  64         }
  65         allocLoad = bytesAllocated() - alloc0
  66         dLoad = time.Since(t0)
  67
  68         alloc0 = bytesAllocated()
  69         for _, pkg := range pkgs {
  70                 if len(pkg.Errors) != 0 {
  71                         t.Fatalf("Load failed: %v", pkg.Errors)
  72                 }
  73
  74                 var mode ir.BuilderMode
  75                 // Comment out these lines during benchmarking.  Approx IR build costs are noted.
  76                 mode |= ir.SanityCheckFunctions // + 2% space, + 4% time
  77                 mode |= ir.GlobalDebug          // +30% space, +18% time
  78                 prog := ir.NewProgram(pkg.Fset, mode)
  79
  80                 t0 := time.Now()
  81                 var irpkg *ir.Package
  82                 for _, pkg2 := range pkgs {
  83                         r := prog.CreatePackage(pkg2.Types, pkg2.Syntax, pkg2.TypesInfo, true)
  84                         if pkg2 == pkg {
  85                                 irpkg = r
  86                         }
  87                 }
  88                 dCreate += time.Since(t0)
  89
  90                 t0 = time.Now()
  91                 irpkg.Build()
  92                 dBuild += time.Since(t0)
  93
  94                 allFuncs := irutil.AllFunctions(prog)
  95                 numFuncs += len(allFuncs)
  96
  97                 // Check that all non-synthetic functions have distinct names.
  98                 // Synthetic wrappers for exported methods should be distinct too,
  99                 // except for unexported ones (explained at (*Function).RelString).
 100                 byName := make(map[string]*ir.Function)
 101                 for fn := range allFuncs {
 102                         if fn.Synthetic == "" || ast.IsExported(fn.Name()) {
 103                                 str := fn.String()
 104                                 prev := byName[str]
 105                                 byName[str] = fn
 106                                 if prev != nil {
 107                                         t.Errorf("%s: duplicate function named %s",
 108                                                 prog.Fset.Position(fn.Pos()), str)
 109                                         t.Errorf("%s:   (previously defined here)",
 110                                                 prog.Fset.Position(prev.Pos()))
 111                                 }
 112                         }
 113                 }
 114
 115                 // Dump some statistics.
 116                 var numInstrs int
 117                 for fn := range allFuncs {
 118                         for _, b := range fn.Blocks {
 119                                 numInstrs += len(b.Instrs)
 120                         }
 121                 }
 122         }
 123         allocBuild = bytesAllocated() - alloc0
 124
 125         // determine line count
 126         var lineCount int
 127         pkgs[0].Fset.Iterate(func(f *token.File) bool {
 128                 lineCount += f.LineCount()
 129                 return true
 130         })
 131
 132         // NB: when benchmarking, don't forget to clear the debug +
 133         // sanity builder flags for better performance.
 134
 135         t.Log("GOMAXPROCS:           ", runtime.GOMAXPROCS(0))
 136         t.Log("#Source lines:        ", lineCount)
 137         t.Log("Load/parse/typecheck: ", dLoad)
 138         t.Log("IR create:           ", dCreate)
 139         t.Log("IR build:            ", dBuild)
 140
 141         // IR stats:
 142         t.Log("#Packages:            ", len(pkgs))
 143         t.Log("#Functions:           ", numFuncs)
 144         t.Log("#Instructions:        ", numInstrs)
 145         t.Log("#MB AST+types:        ", allocLoad/1e6)
 146         t.Log("#MB IR:              ", allocBuild/1e6)
 147 }