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Copy pathstdlib_test.go
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148 lines (122 loc) · 3.8 KB
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// Copyright 2013 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.
//lint:file-ignore SA1019 go/ssa's test suite is built around the deprecated go/loader. We'll leave fixing that to upstream.
// Incomplete source tree on Android.
// +build !android
package ir_test
// This file runs the IR builder in sanity-checking mode on all
// packages beneath $GOROOT and prints some summary information.
//
// Run with "go test -cpu=8 to" set GOMAXPROCS.
import (
"go/ast"
"go/token"
"runtime"
"testing"
"time"
"honnef.co/go/tools/go/ir"
"honnef.co/go/tools/go/ir/irutil"
"golang.org/x/tools/go/packages"
)
func bytesAllocated() uint64 {
runtime.GC()
var stats runtime.MemStats
runtime.ReadMemStats(&stats)
return stats.TotalAlloc
}
func TestStdlib(t *testing.T) {
if testing.Short() {
t.Skip("skipping in short mode; too slow (golang.org/issue/14113)")
}
var (
numFuncs int
numInstrs int
dLoad time.Duration
dCreate time.Duration
dBuild time.Duration
allocLoad uint64
allocBuild uint64
)
// Load, parse and type-check the program.
t0 := time.Now()
alloc0 := bytesAllocated()
cfg := &packages.Config{
Mode: packages.NeedName | packages.NeedFiles | packages.NeedCompiledGoFiles | packages.NeedImports | packages.NeedDeps | packages.NeedTypes | packages.NeedSyntax | packages.NeedTypesInfo | packages.NeedTypesSizes,
}
pkgs, err := packages.Load(cfg, "std")
if err != nil {
t.Fatalf("Load failed: %v", err)
}
allocLoad = bytesAllocated() - alloc0
dLoad = time.Since(t0)
alloc0 = bytesAllocated()
for _, pkg := range pkgs {
if len(pkg.Errors) != 0 {
t.Fatalf("Load failed: %v", pkg.Errors)
}
var mode ir.BuilderMode
// Comment out these lines during benchmarking. Approx IR build costs are noted.
mode |= ir.SanityCheckFunctions // + 2% space, + 4% time
mode |= ir.GlobalDebug // +30% space, +18% time
prog := ir.NewProgram(pkg.Fset, mode)
t0 := time.Now()
var irpkg *ir.Package
for _, pkg2 := range pkgs {
r := prog.CreatePackage(pkg2.Types, pkg2.Syntax, pkg2.TypesInfo, true)
if pkg2 == pkg {
irpkg = r
}
}
dCreate += time.Since(t0)
t0 = time.Now()
irpkg.Build()
dBuild += time.Since(t0)
allFuncs := irutil.AllFunctions(prog)
numFuncs += len(allFuncs)
// Check that all non-synthetic functions have distinct names.
// Synthetic wrappers for exported methods should be distinct too,
// except for unexported ones (explained at (*Function).RelString).
byName := make(map[string]*ir.Function)
for fn := range allFuncs {
if fn.Synthetic == 0 || ast.IsExported(fn.Name()) {
str := fn.String()
prev := byName[str]
byName[str] = fn
if prev != nil {
t.Errorf("%s: duplicate function named %s",
prog.Fset.Position(fn.Pos()), str)
t.Errorf("%s: (previously defined here)",
prog.Fset.Position(prev.Pos()))
}
}
}
// Dump some statistics.
var numInstrs int
for fn := range allFuncs {
for _, b := range fn.Blocks {
numInstrs += len(b.Instrs)
}
}
}
allocBuild = bytesAllocated() - alloc0
// determine line count
var lineCount int
pkgs[0].Fset.Iterate(func(f *token.File) bool {
lineCount += f.LineCount()
return true
})
// NB: when benchmarking, don't forget to clear the debug +
// sanity builder flags for better performance.
t.Log("GOMAXPROCS: ", runtime.GOMAXPROCS(0))
t.Log("#Source lines: ", lineCount)
t.Log("Load/parse/typecheck: ", dLoad)
t.Log("IR create: ", dCreate)
t.Log("IR build: ", dBuild)
// IR stats:
t.Log("#Packages: ", len(pkgs))
t.Log("#Functions: ", numFuncs)
t.Log("#Instructions: ", numInstrs)
t.Log("#MB AST+types: ", allocLoad/1e6)
t.Log("#MB IR: ", allocBuild/1e6)
}