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depgraph.go
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depgraph.go
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// Copyright 2015 Google Inc. All rights reserved
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package kati
import (
"crypto/sha1"
"fmt"
"io/ioutil"
"strings"
"time"
"github.com/golang/glog"
)
// DepGraph represents rules defined in makefiles.
type DepGraph struct {
nodes []*DepNode
vars Vars
accessedMks []*accessedMakefile
exports map[string]bool
vpaths searchPaths
}
// Nodes returns all rules.
func (g *DepGraph) Nodes() []*DepNode { return g.nodes }
// Vars returns all variables.
func (g *DepGraph) Vars() Vars { return g.vars }
func (g *DepGraph) resolveVPATH() {
seen := make(map[*DepNode]bool)
var fix func(n *DepNode)
fix = func(n *DepNode) {
if seen[n] {
return
}
seen[n] = true
glog.V(3).Infof("vpath check %s [%#v]", n.Output, g.vpaths)
if output, ok := g.vpaths.exists(n.Output); ok {
glog.V(2).Infof("vpath fix %s=>%s", n.Output, output)
n.Output = output
}
for _, d := range n.Deps {
fix(d)
}
for _, d := range n.OrderOnlys {
fix(d)
}
for _, d := range n.Parents {
fix(d)
}
// fix ActualInputs?
}
for _, n := range g.nodes {
fix(n)
}
}
// LoadReq is a request to load makefile.
type LoadReq struct {
Makefile string
Targets []string
CommandLineVars []string
EnvironmentVars []string
UseCache bool
EagerEvalCommand bool
}
// FromCommandLine creates LoadReq from given command line.
func FromCommandLine(cmdline []string) LoadReq {
var vars []string
var targets []string
for _, arg := range cmdline {
if strings.IndexByte(arg, '=') >= 0 {
vars = append(vars, arg)
continue
}
targets = append(targets, arg)
}
mk, err := defaultMakefile()
if err != nil {
glog.Warningf("default makefile: %v", err)
}
return LoadReq{
Makefile: mk,
Targets: targets,
CommandLineVars: vars,
}
}
func initVars(vars Vars, kvlist []string, origin string) error {
for _, v := range kvlist {
kv := strings.SplitN(v, "=", 2)
glog.V(1).Infof("%s var %q", origin, v)
if len(kv) < 2 {
return fmt.Errorf("A weird %s variable %q", origin, kv)
}
vars.Assign(kv[0], &recursiveVar{
expr: literal(kv[1]),
origin: origin,
})
}
return nil
}
// Load loads makefile.
func Load(req LoadReq) (*DepGraph, error) {
startTime := time.Now()
var err error
if req.Makefile == "" {
req.Makefile, err = defaultMakefile()
if err != nil {
return nil, err
}
}
if req.UseCache {
g, err := loadCache(req.Makefile, req.Targets)
if err == nil {
return g, nil
}
}
bmk, err := bootstrapMakefile(req.Targets)
if err != nil {
return nil, err
}
content, err := ioutil.ReadFile(req.Makefile)
if err != nil {
return nil, err
}
mk, err := parseMakefile(content, req.Makefile)
if err != nil {
return nil, err
}
for _, stmt := range mk.stmts {
stmt.show()
}
mk.stmts = append(bmk.stmts, mk.stmts...)
vars := make(Vars)
err = initVars(vars, req.EnvironmentVars, "environment")
if err != nil {
return nil, err
}
err = initVars(vars, req.CommandLineVars, "command line")
if err != nil {
return nil, err
}
er, err := eval(mk, vars, req.UseCache)
if err != nil {
return nil, err
}
vars.Merge(er.vars)
logStats("eval time: %q", time.Since(startTime))
logStats("shell func time: %q %d", shellStats.Duration(), shellStats.Count())
startTime = time.Now()
db, err := newDepBuilder(er, vars)
if err != nil {
return nil, err
}
logStats("dep build prepare time: %q", time.Since(startTime))
startTime = time.Now()
nodes, err := db.Eval(req.Targets)
if err != nil {
return nil, err
}
logStats("dep build time: %q", time.Since(startTime))
var accessedMks []*accessedMakefile
// Always put the root Makefile as the first element.
accessedMks = append(accessedMks, &accessedMakefile{
Filename: req.Makefile,
Hash: sha1.Sum(content),
State: fileExists,
})
accessedMks = append(accessedMks, er.accessedMks...)
gd := &DepGraph{
nodes: nodes,
vars: vars,
accessedMks: accessedMks,
exports: er.exports,
vpaths: er.vpaths,
}
if req.EagerEvalCommand {
startTime := time.Now()
err = evalCommands(nodes, vars)
if err != nil {
return nil, err
}
logStats("eager eval command time: %q", time.Since(startTime))
}
if req.UseCache {
startTime := time.Now()
saveCache(gd, req.Targets)
logStats("serialize time: %q", time.Since(startTime))
}
return gd, nil
}
// Loader is the interface that loads DepGraph.
type Loader interface {
Load(string) (*DepGraph, error)
}
// Saver is the interface that saves DepGraph.
type Saver interface {
Save(*DepGraph, string, []string) error
}
// LoadSaver is the interface that groups Load and Save methods.
type LoadSaver interface {
Loader
Saver
}