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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 main
import (
"bytes"
"crypto/sha1"
"fmt"
"io/ioutil"
"path/filepath"
"strings"
)
type FileState int
const (
FileExists FileState = iota
FileNotExists
FileInconsistent // Modified during kati is running.
)
type ReadMakefile struct {
Filename string
Hash [sha1.Size]byte
State FileState
}
type EvalResult struct {
vars Vars
rules []*Rule
ruleVars map[string]Vars
readMks []*ReadMakefile
exports map[string]bool
}
type Evaluator struct {
paramVars []tmpval // $1 => paramVars[1]
outVars Vars
outRules []*Rule
outRuleVars map[string]Vars
vars Vars
lastRule *Rule
currentScope Vars
avoidIO bool
hasIO bool
readMks map[string]*ReadMakefile
exports map[string]bool
filename string
lineno int
}
func newEvaluator(vars map[string]Var) *Evaluator {
return &Evaluator{
outVars: make(Vars),
vars: vars,
outRuleVars: make(map[string]Vars),
readMks: make(map[string]*ReadMakefile),
exports: make(map[string]bool),
}
}
func (ev *Evaluator) args(buf *buffer, args ...Value) [][]byte {
var pos []int
for _, arg := range args {
arg.Eval(buf, ev)
pos = append(pos, buf.Len())
}
v := buf.Bytes()
buf.args = buf.args[:0]
s := 0
for _, p := range pos {
buf.args = append(buf.args, v[s:p])
s = p
}
return buf.args
}
func (ev *Evaluator) evalAssign(ast *AssignAST) {
ev.lastRule = nil
lhs, rhs := ev.evalAssignAST(ast)
Logf("ASSIGN: %s=%q (flavor:%q)", lhs, rhs, rhs.Flavor())
if len(lhs) == 0 {
Error(ast.filename, ast.lineno, "*** empty variable name.")
}
ev.outVars.Assign(lhs, rhs)
}
func (ev *Evaluator) evalAssignAST(ast *AssignAST) (string, Var) {
ev.filename = ast.filename
ev.lineno = ast.lineno
var lhs string
switch v := ast.lhs.(type) {
case literal:
lhs = string(v)
case tmpval:
lhs = string(v)
default:
buf := newBuf()
v.Eval(buf, ev)
lhs = string(trimSpaceBytes(buf.Bytes()))
freeBuf(buf)
}
rhs := ast.evalRHS(ev, lhs)
return lhs, rhs
}
func (ev *Evaluator) setTargetSpecificVar(assign *AssignAST, output string) {
vars, present := ev.outRuleVars[output]
if !present {
vars = make(Vars)
ev.outRuleVars[output] = vars
}
ev.currentScope = vars
lhs, rhs := ev.evalAssignAST(assign)
Logf("rule outputs:%q assign:%q=%q (flavor:%q)", output, lhs, rhs, rhs.Flavor())
vars.Assign(lhs, TargetSpecificVar{v: rhs, op: assign.op})
ev.currentScope = nil
}
func (ev *Evaluator) evalMaybeRule(ast *MaybeRuleAST) {
ev.lastRule = nil
ev.filename = ast.filename
ev.lineno = ast.lineno
lexpr := ast.expr
buf := newBuf()
lexpr.Eval(buf, ev)
line := buf.Bytes()
if ast.term == '=' {
line = append(line, ast.afterTerm...)
}
Logf("rule? %q=>%q", ast.expr, line)
// See semicolon.mk.
if len(bytes.TrimRight(line, " \t\n;")) == 0 {
freeBuf(buf)
return
}
rule := &Rule{
filename: ast.filename,
lineno: ast.lineno,
}
assign, err := rule.parse(line)
if err != nil {
Error(ast.filename, ast.lineno, "%v", err.Error())
}
freeBuf(buf)
Logf("rule %q => outputs:%q, inputs:%q", line, rule.outputs, rule.inputs)
// TODO: Pretty print.
//Logf("RULE: %s=%s (%d commands)", lhs, rhs, len(cmds))
if assign != nil {
if ast.term == ';' {
nexpr, _, err := parseExpr(ast.afterTerm, nil)
if err != nil {
panic(fmt.Errorf("parse %s:%d %v", ev.filename, ev.lineno, err))
}
lexpr = Expr{lexpr, nexpr}
buf = newBuf()
lexpr.Eval(buf, ev)
assign, err = rule.parse(buf.Bytes())
if err != nil {
Error(ast.filename, ast.lineno, "%v", err.Error())
}
freeBuf(buf)
}
for _, output := range rule.outputs {
ev.setTargetSpecificVar(assign, output)
}
for _, output := range rule.outputPatterns {
ev.setTargetSpecificVar(assign, output.String())
}
return
}
if ast.term == ';' {
rule.cmds = append(rule.cmds, string(ast.afterTerm[1:]))
}
Logf("rule outputs:%q cmds:%q", rule.outputs, rule.cmds)
ev.lastRule = rule
ev.outRules = append(ev.outRules, rule)
}
func (ev *Evaluator) evalCommand(ast *CommandAST) {
ev.filename = ast.filename
ev.lineno = ast.lineno
if ev.lastRule == nil {
// This could still be an assignment statement. See
// assign_after_tab.mk.
if strings.IndexByte(ast.cmd, '=') >= 0 {
line := trimLeftSpace(ast.cmd)
mk, err := ParseMakefileString(line, ast.filename, ast.lineno)
if err != nil {
panic(err)
}
if len(mk.stmts) == 1 && mk.stmts[0].(*AssignAST) != nil {
ev.eval(mk.stmts[0])
}
return
}
// Or, a comment is OK.
if strings.TrimSpace(ast.cmd)[0] == '#' {
return
}
Error(ast.filename, ast.lineno, "*** commands commence before first target.")
}
ev.lastRule.cmds = append(ev.lastRule.cmds, ast.cmd)
if ev.lastRule.cmdLineno == 0 {
ev.lastRule.cmdLineno = ast.lineno
}
}
func (ev *Evaluator) LookupVar(name string) Var {
if ev.currentScope != nil {
v := ev.currentScope.Lookup(name)
if v.IsDefined() {
return v
}
}
v := ev.outVars.Lookup(name)
if v.IsDefined() {
return v
}
return ev.vars.Lookup(name)
}
func (ev *Evaluator) LookupVarInCurrentScope(name string) Var {
if ev.currentScope != nil {
v := ev.currentScope.Lookup(name)
return v
}
v := ev.outVars.Lookup(name)
if v.IsDefined() {
return v
}
return ev.vars.Lookup(name)
}
// EvaluateVar evaluates variable named name.
// Only for a few special uses such as getting SHELL and handling
// export/unexport.
func (ev *Evaluator) EvaluateVar(name string) string {
var buf bytes.Buffer
ev.LookupVar(name).Eval(&buf, ev)
return buf.String()
}
func (ev *Evaluator) evalIncludeFile(fname string, c []byte) error {
te := traceEvent.begin("include", literal(fname), traceEventMain)
defer func() {
traceEvent.end(te)
}()
mk, ok, err := LookupMakefileCache(fname)
if !ok {
Logf("Reading makefile %q", fname)
mk, err = ParseMakefile(c, fname)
}
if err != nil {
return err
}
makefileList := ev.outVars.Lookup("MAKEFILE_LIST")
makefileList = makefileList.Append(ev, mk.filename)
ev.outVars.Assign("MAKEFILE_LIST", makefileList)
for _, stmt := range mk.stmts {
ev.eval(stmt)
}
return nil
}
func (ev *Evaluator) updateReadMakefile(fn string, c []byte, st FileState) {
if !useCache {
return
}
h := sha1.Sum(c)
rm, present := ev.readMks[fn]
if present {
switch rm.State {
case FileExists:
if st != FileExists {
Warn(ev.filename, ev.lineno, "%s was removed after the previous read", fn)
} else if !bytes.Equal(h[:], rm.Hash[:]) {
Warn(ev.filename, ev.lineno, "%s was modified after the previous read", fn)
ev.readMks[fn].State = FileInconsistent
}
return
case FileNotExists:
if st != FileNotExists {
Warn(ev.filename, ev.lineno, "%s was created after the previous read", fn)
ev.readMks[fn].State = FileInconsistent
}
case FileInconsistent:
return
}
} else {
ev.readMks[fn] = &ReadMakefile{
Filename: fn,
Hash: h,
State: st,
}
}
}
func (ev *Evaluator) evalInclude(ast *IncludeAST) {
ev.lastRule = nil
ev.filename = ast.filename
ev.lineno = ast.lineno
Logf("%s:%d include %q", ev.filename, ev.lineno, ast.expr)
v, _, err := parseExpr([]byte(ast.expr), nil)
if err != nil {
panic(err)
}
var buf bytes.Buffer
v.Eval(&buf, ev)
pats := splitSpaces(buf.String())
buf.Reset()
var files []string
for _, pat := range pats {
if strings.Contains(pat, "*") || strings.Contains(pat, "?") {
matched, err := filepath.Glob(pat)
if err != nil {
panic(err)
}
files = append(files, matched...)
} else {
files = append(files, pat)
}
}
for _, fn := range files {
if ignoreOptionalInclude != "" && ast.op == "-include" && matchPattern(fn, ignoreOptionalInclude) {
continue
}
c, err := ioutil.ReadFile(fn)
if err != nil {
if ast.op == "include" {
Error(ev.filename, ev.lineno, fmt.Sprintf("%v\nNOTE: kati does not support generating missing makefiles", err))
} else {
ev.updateReadMakefile(fn, nil, FileNotExists)
continue
}
}
ev.updateReadMakefile(fn, c, FileExists)
err = ev.evalIncludeFile(fn, c)
if err != nil {
panic(err)
}
}
}
func (ev *Evaluator) evalIf(ast *IfAST) {
var isTrue bool
switch ast.op {
case "ifdef", "ifndef":
expr := ast.lhs
buf := newBuf()
expr.Eval(buf, ev)
v := ev.LookupVar(buf.String())
buf.Reset()
v.Eval(buf, ev)
value := buf.String()
val := buf.Len()
freeBuf(buf)
isTrue = (val > 0) == (ast.op == "ifdef")
Logf("%s lhs=%q value=%q => %t", ast.op, ast.lhs, value, isTrue)
case "ifeq", "ifneq":
lexpr := ast.lhs
rexpr := ast.rhs
buf := newBuf()
params := ev.args(buf, lexpr, rexpr)
lhs := string(params[0])
rhs := string(params[1])
freeBuf(buf)
isTrue = (lhs == rhs) == (ast.op == "ifeq")
Logf("%s lhs=%q %q rhs=%q %q => %t", ast.op, ast.lhs, lhs, ast.rhs, rhs, isTrue)
default:
panic(fmt.Sprintf("unknown if statement: %q", ast.op))
}
var stmts []AST
if isTrue {
stmts = ast.trueStmts
} else {
stmts = ast.falseStmts
}
for _, stmt := range stmts {
ev.eval(stmt)
}
}
func (ev *Evaluator) evalExport(ast *ExportAST) {
ev.lastRule = nil
ev.filename = ast.filename
ev.lineno = ast.lineno
v, _, err := parseExpr(ast.expr, nil)
if err != nil {
panic(err)
}
var buf bytes.Buffer
v.Eval(&buf, ev)
for _, n := range splitSpacesBytes(buf.Bytes()) {
ev.exports[string(n)] = ast.export
}
}
func (ev *Evaluator) eval(ast AST) {
ast.eval(ev)
}
func createReadMakefileArray(mp map[string]*ReadMakefile) []*ReadMakefile {
var r []*ReadMakefile
for _, v := range mp {
r = append(r, v)
}
return r
}
func Eval(mk Makefile, vars Vars) (er *EvalResult, err error) {
ev := newEvaluator(vars)
defer func() {
if r := recover(); r != nil {
err = fmt.Errorf("panic in eval %s: %v", mk.filename, r)
}
}()
makefileList := vars.Lookup("MAKEFILE_LIST")
makefileList = makefileList.Append(ev, mk.filename)
ev.outVars.Assign("MAKEFILE_LIST", makefileList)
for _, stmt := range mk.stmts {
ev.eval(stmt)
}
return &EvalResult{
vars: ev.outVars,
rules: ev.outRules,
ruleVars: ev.outRuleVars,
readMks: createReadMakefileArray(ev.readMks),
exports: ev.exports,
}, nil
}
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