.config/coc/extensions/coc-go-data/tools/pkg/mod/honnef.co/go/tools@v0.1.1/go/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         "honnef.co/go/tools/go/ir"
  26         "honnef.co/go/tools/go/ir/irutil"
  27
  28         "golang.org/x/tools/go/packages"
  29 )
  30
  31 func bytesAllocated() uint64 {
  32         runtime.GC()
  33         var stats runtime.MemStats
  34         runtime.ReadMemStats(&stats)
  35         return stats.TotalAlloc
  36 }
  37
  38 func TestStdlib(t *testing.T) {
  39         if testing.Short() {
  40                 t.Skip("skipping in short mode; too slow (golang.org/issue/14113)")
  41         }
  42
  43         var (
  44                 numFuncs  int
  45                 numInstrs int
  46
  47                 dLoad   time.Duration
  48                 dCreate time.Duration
  49                 dBuild  time.Duration
  50
  51                 allocLoad  uint64
  52                 allocBuild uint64
  53         )
  54
  55         // Load, parse and type-check the program.
  56         t0 := time.Now()
  57         alloc0 := bytesAllocated()
  58
  59         cfg := &packages.Config{
  60                 Mode: packages.NeedName | packages.NeedFiles | packages.NeedCompiledGoFiles | packages.NeedImports | packages.NeedDeps | packages.NeedTypes | packages.NeedSyntax | packages.NeedTypesInfo | packages.NeedTypesSizes,
  61         }
  62         pkgs, err := packages.Load(cfg, "std")
  63         if err != nil {
  64                 t.Fatalf("Load failed: %v", err)
  65         }
  66         allocLoad = bytesAllocated() - alloc0
  67         dLoad = time.Since(t0)
  68
  69         alloc0 = bytesAllocated()
  70         for _, pkg := range pkgs {
  71                 if len(pkg.Errors) != 0 {
  72                         t.Fatalf("Load failed: %v", pkg.Errors)
  73                 }
  74
  75                 var mode ir.BuilderMode
  76                 // Comment out these lines during benchmarking.  Approx IR build costs are noted.
  77                 mode |= ir.SanityCheckFunctions // + 2% space, + 4% time
  78                 mode |= ir.GlobalDebug          // +30% space, +18% time
  79                 prog := ir.NewProgram(pkg.Fset, mode)
  80
  81                 t0 := time.Now()
  82                 var irpkg *ir.Package
  83                 for _, pkg2 := range pkgs {
  84                         r := prog.CreatePackage(pkg2.Types, pkg2.Syntax, pkg2.TypesInfo, true)
  85                         if pkg2 == pkg {
  86                                 irpkg = r
  87                         }
  88                 }
  89                 dCreate += time.Since(t0)
  90
  91                 t0 = time.Now()
  92                 irpkg.Build()
  93                 dBuild += time.Since(t0)
  94
  95                 allFuncs := irutil.AllFunctions(prog)
  96                 numFuncs += len(allFuncs)
  97
  98                 // Check that all non-synthetic functions have distinct names.
  99                 // Synthetic wrappers for exported methods should be distinct too,
 100                 // except for unexported ones (explained at (*Function).RelString).
 101                 byName := make(map[string]*ir.Function)
 102                 for fn := range allFuncs {
 103                         if fn.Synthetic == 0 || ast.IsExported(fn.Name()) {
 104                                 str := fn.String()
 105                                 prev := byName[str]
 106                                 byName[str] = fn
 107                                 if prev != nil {
 108                                         t.Errorf("%s: duplicate function named %s",
 109                                                 prog.Fset.Position(fn.Pos()), str)
 110                                         t.Errorf("%s:   (previously defined here)",
 111                                                 prog.Fset.Position(prev.Pos()))
 112                                 }
 113                         }
 114                 }
 115
 116                 // Dump some statistics.
 117                 var numInstrs int
 118                 for fn := range allFuncs {
 119                         for _, b := range fn.Blocks {
 120                                 numInstrs += len(b.Instrs)
 121                         }
 122                 }
 123         }
 124         allocBuild = bytesAllocated() - alloc0
 125
 126         // determine line count
 127         var lineCount int
 128         pkgs[0].Fset.Iterate(func(f *token.File) bool {
 129                 lineCount += f.LineCount()
 130                 return true
 131         })
 132
 133         // NB: when benchmarking, don't forget to clear the debug +
 134         // sanity builder flags for better performance.
 135
 136         t.Log("GOMAXPROCS:           ", runtime.GOMAXPROCS(0))
 137         t.Log("#Source lines:        ", lineCount)
 138         t.Log("Load/parse/typecheck: ", dLoad)
 139         t.Log("IR create:           ", dCreate)
 140         t.Log("IR build:            ", dBuild)
 141
 142         // IR stats:
 143         t.Log("#Packages:            ", len(pkgs))
 144         t.Log("#Functions:           ", numFuncs)
 145         t.Log("#Instructions:        ", numInstrs)
 146         t.Log("#MB AST+types:        ", allocLoad/1e6)
 147         t.Log("#MB IR:              ", allocBuild/1e6)
 148 }