538 lines
14 KiB
Go
538 lines
14 KiB
Go
// Copyright 2015 Google Inc. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package cc
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// This file generates the final rules for compiling all C/C++. All properties related to
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// compiling should have been translated into builderFlags or another argument to the Transform*
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// functions.
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import (
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"android/soong/android"
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"fmt"
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"runtime"
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"strconv"
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"path/filepath"
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"strings"
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"github.com/google/blueprint"
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)
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const (
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objectExtension = ".o"
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staticLibraryExtension = ".a"
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)
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var (
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pctx = android.NewPackageContext("android/soong/cc")
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cc = pctx.StaticRule("cc",
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blueprint.RuleParams{
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Depfile: "${out}.d",
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Deps: blueprint.DepsGCC,
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Command: "$relPwd $ccCmd -c $cFlags -MD -MF ${out}.d -o $out $in",
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CommandDeps: []string{"$ccCmd"},
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Description: "cc $out",
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},
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"ccCmd", "cFlags")
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ld = pctx.StaticRule("ld",
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blueprint.RuleParams{
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Command: "$ldCmd ${ldDirFlags} ${crtBegin} @${out}.rsp " +
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"${libFlags} ${crtEnd} -o ${out} ${ldFlags}",
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CommandDeps: []string{"$ldCmd"},
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Description: "ld $out",
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Rspfile: "${out}.rsp",
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RspfileContent: "${in}",
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},
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"ldCmd", "ldDirFlags", "crtBegin", "libFlags", "crtEnd", "ldFlags")
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partialLd = pctx.StaticRule("partialLd",
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blueprint.RuleParams{
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Command: "$ldCmd -nostdlib -Wl,-r ${in} -o ${out} ${ldFlags}",
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CommandDeps: []string{"$ldCmd"},
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Description: "partialLd $out",
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},
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"ldCmd", "ldFlags")
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ar = pctx.StaticRule("ar",
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blueprint.RuleParams{
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Command: "rm -f ${out} && $arCmd $arFlags $out @${out}.rsp",
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CommandDeps: []string{"$arCmd"},
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Description: "ar $out",
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Rspfile: "${out}.rsp",
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RspfileContent: "${in}",
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},
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"arCmd", "arFlags")
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darwinAr = pctx.StaticRule("darwinAr",
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blueprint.RuleParams{
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Command: "rm -f ${out} && ${macArPath} $arFlags $out $in",
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CommandDeps: []string{"${macArPath}"},
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Description: "ar $out",
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},
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"arFlags")
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darwinAppendAr = pctx.StaticRule("darwinAppendAr",
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blueprint.RuleParams{
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Command: "cp -f ${inAr} ${out}.tmp && ${macArPath} $arFlags ${out}.tmp $in && mv ${out}.tmp ${out}",
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CommandDeps: []string{"${macArPath}", "${inAr}"},
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Description: "ar $out",
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},
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"arFlags", "inAr")
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darwinStrip = pctx.StaticRule("darwinStrip",
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blueprint.RuleParams{
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Command: "${macStripPath} -u -r -o $out $in",
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CommandDeps: []string{"${macStripPath}"},
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Description: "strip $out",
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})
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prefixSymbols = pctx.StaticRule("prefixSymbols",
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blueprint.RuleParams{
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Command: "$objcopyCmd --prefix-symbols=${prefix} ${in} ${out}",
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CommandDeps: []string{"$objcopyCmd"},
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Description: "prefixSymbols $out",
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},
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"objcopyCmd", "prefix")
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stripPath = pctx.SourcePathVariable("stripPath", "build/soong/scripts/strip.sh")
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strip = pctx.StaticRule("strip",
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blueprint.RuleParams{
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Depfile: "${out}.d",
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Deps: blueprint.DepsGCC,
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Command: "CROSS_COMPILE=$crossCompile $stripPath ${args} -i ${in} -o ${out} -d ${out}.d",
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CommandDeps: []string{"$stripPath"},
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Description: "strip $out",
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},
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"args", "crossCompile")
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emptyFile = pctx.StaticRule("emptyFile",
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blueprint.RuleParams{
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Command: "rm -f $out && touch $out",
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Description: "empty file $out",
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})
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copyGccLibPath = pctx.SourcePathVariable("copyGccLibPath", "build/soong/scripts/copygcclib.sh")
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copyGccLib = pctx.StaticRule("copyGccLib",
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blueprint.RuleParams{
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Depfile: "${out}.d",
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Deps: blueprint.DepsGCC,
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Command: "$copyGccLibPath $out $ccCmd $cFlags -print-file-name=${libName}",
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CommandDeps: []string{"$copyGccLibPath", "$ccCmd"},
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Description: "copy gcc $out",
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},
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"ccCmd", "cFlags", "libName")
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)
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func init() {
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// We run gcc/clang with PWD=/proc/self/cwd to remove $TOP from the
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// debug output. That way two builds in two different directories will
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// create the same output.
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if runtime.GOOS != "darwin" {
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pctx.StaticVariable("relPwd", "PWD=/proc/self/cwd")
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} else {
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// Darwin doesn't have /proc
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pctx.StaticVariable("relPwd", "")
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}
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}
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type builderFlags struct {
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globalFlags string
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asFlags string
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cFlags string
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conlyFlags string
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cppFlags string
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ldFlags string
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libFlags string
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yaccFlags string
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nocrt bool
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toolchain Toolchain
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clang bool
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stripKeepSymbols bool
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stripKeepMiniDebugInfo bool
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stripAddGnuDebuglink bool
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}
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// Generate rules for compiling multiple .c, .cpp, or .S files to individual .o files
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func TransformSourceToObj(ctx android.ModuleContext, subdir string, srcFiles android.Paths,
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flags builderFlags, deps android.Paths) (objFiles android.Paths) {
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objFiles = make(android.Paths, len(srcFiles))
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cflags := flags.globalFlags + " " + flags.cFlags + " " + flags.conlyFlags
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cppflags := flags.globalFlags + " " + flags.cFlags + " " + flags.cppFlags
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asflags := flags.globalFlags + " " + flags.asFlags
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if flags.clang {
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cflags += " ${noOverrideClangGlobalCflags}"
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cppflags += " ${noOverrideClangGlobalCflags}"
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} else {
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cflags += " ${noOverrideGlobalCflags}"
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cppflags += " ${noOverrideGlobalCflags}"
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}
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for i, srcFile := range srcFiles {
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objFile := android.ObjPathWithExt(ctx, srcFile, subdir, "o")
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objFiles[i] = objFile
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var moduleCflags string
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var ccCmd string
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switch srcFile.Ext() {
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case ".S", ".s":
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ccCmd = "gcc"
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moduleCflags = asflags
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case ".c":
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ccCmd = "gcc"
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moduleCflags = cflags
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case ".cpp", ".cc":
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ccCmd = "g++"
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moduleCflags = cppflags
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default:
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ctx.ModuleErrorf("File %s has unknown extension", srcFile)
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continue
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}
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if flags.clang {
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switch ccCmd {
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case "gcc":
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ccCmd = "clang"
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case "g++":
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ccCmd = "clang++"
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default:
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panic("unrecoginzied ccCmd")
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}
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ccCmd = "${clangBin}/" + ccCmd
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} else {
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ccCmd = gccCmd(flags.toolchain, ccCmd)
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}
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ctx.ModuleBuild(pctx, android.ModuleBuildParams{
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Rule: cc,
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Output: objFile,
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Input: srcFile,
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OrderOnly: deps,
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Args: map[string]string{
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"cFlags": moduleCflags,
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"ccCmd": ccCmd,
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},
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})
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}
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return objFiles
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}
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// Generate a rule for compiling multiple .o files to a static library (.a)
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func TransformObjToStaticLib(ctx android.ModuleContext, objFiles android.Paths,
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flags builderFlags, outputFile android.ModuleOutPath) {
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arCmd := gccCmd(flags.toolchain, "ar")
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arFlags := "crsPD"
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ctx.ModuleBuild(pctx, android.ModuleBuildParams{
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Rule: ar,
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Output: outputFile,
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Inputs: objFiles,
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Args: map[string]string{
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"arFlags": arFlags,
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"arCmd": arCmd,
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},
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})
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}
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// Generate a rule for compiling multiple .o files to a static library (.a) on
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// darwin. The darwin ar tool doesn't support @file for list files, and has a
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// very small command line length limit, so we have to split the ar into multiple
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// steps, each appending to the previous one.
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func TransformDarwinObjToStaticLib(ctx android.ModuleContext, objFiles android.Paths,
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flags builderFlags, outputPath android.ModuleOutPath) {
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arFlags := "cqs"
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if len(objFiles) == 0 {
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dummy := android.PathForModuleOut(ctx, "dummy"+objectExtension)
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dummyAr := android.PathForModuleOut(ctx, "dummy"+staticLibraryExtension)
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ctx.ModuleBuild(pctx, android.ModuleBuildParams{
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Rule: emptyFile,
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Output: dummy,
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})
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ctx.ModuleBuild(pctx, android.ModuleBuildParams{
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Rule: darwinAr,
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Output: dummyAr,
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Input: dummy,
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Args: map[string]string{
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"arFlags": arFlags,
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},
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})
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ctx.ModuleBuild(pctx, android.ModuleBuildParams{
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Rule: darwinAppendAr,
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Output: outputPath,
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Input: dummy,
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Args: map[string]string{
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"arFlags": "d",
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"inAr": dummyAr.String(),
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},
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})
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return
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}
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// ARG_MAX on darwin is 262144, use half that to be safe
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objFilesLists, err := splitListForSize(objFiles.Strings(), 131072)
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if err != nil {
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ctx.ModuleErrorf("%s", err.Error())
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}
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outputFile := outputPath.String()
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var in, out string
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for i, l := range objFilesLists {
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in = out
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out = outputFile
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if i != len(objFilesLists)-1 {
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out += "." + strconv.Itoa(i)
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}
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if in == "" {
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ctx.Build(pctx, blueprint.BuildParams{
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Rule: darwinAr,
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Outputs: []string{out},
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Inputs: l,
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Args: map[string]string{
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"arFlags": arFlags,
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},
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})
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} else {
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ctx.Build(pctx, blueprint.BuildParams{
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Rule: darwinAppendAr,
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Outputs: []string{out},
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Inputs: l,
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Args: map[string]string{
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"arFlags": arFlags,
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"inAr": in,
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},
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})
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}
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}
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}
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// Generate a rule for compiling multiple .o files, plus static libraries, whole static libraries,
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// and shared libraires, to a shared library (.so) or dynamic executable
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func TransformObjToDynamicBinary(ctx android.ModuleContext,
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objFiles, sharedLibs, staticLibs, lateStaticLibs, wholeStaticLibs, deps android.Paths,
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crtBegin, crtEnd android.OptionalPath, groupLate bool, flags builderFlags, outputFile android.WritablePath) {
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var ldCmd string
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if flags.clang {
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ldCmd = "${clangBin}/clang++"
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} else {
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ldCmd = gccCmd(flags.toolchain, "g++")
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}
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var ldDirs []string
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var libFlagsList []string
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if len(flags.libFlags) > 0 {
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libFlagsList = append(libFlagsList, flags.libFlags)
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}
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if len(wholeStaticLibs) > 0 {
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if ctx.Host() && ctx.Darwin() {
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libFlagsList = append(libFlagsList, android.JoinWithPrefix(wholeStaticLibs.Strings(), "-force_load "))
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} else {
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libFlagsList = append(libFlagsList, "-Wl,--whole-archive ")
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libFlagsList = append(libFlagsList, wholeStaticLibs.Strings()...)
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libFlagsList = append(libFlagsList, "-Wl,--no-whole-archive ")
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}
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}
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libFlagsList = append(libFlagsList, staticLibs.Strings()...)
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if groupLate && !ctx.Darwin() && len(lateStaticLibs) > 0 {
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libFlagsList = append(libFlagsList, "-Wl,--start-group")
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}
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libFlagsList = append(libFlagsList, lateStaticLibs.Strings()...)
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if groupLate && !ctx.Darwin() && len(lateStaticLibs) > 0 {
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libFlagsList = append(libFlagsList, "-Wl,--end-group")
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}
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for _, lib := range sharedLibs {
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dir, file := filepath.Split(lib.String())
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if !strings.HasPrefix(file, "lib") {
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panic("shared library " + lib.String() + " does not start with lib")
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}
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if !strings.HasSuffix(file, flags.toolchain.ShlibSuffix()) {
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panic("shared library " + lib.String() + " does not end with " + flags.toolchain.ShlibSuffix())
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}
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libFlagsList = append(libFlagsList,
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"-l"+strings.TrimSuffix(strings.TrimPrefix(file, "lib"), flags.toolchain.ShlibSuffix()))
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ldDirs = append(ldDirs, dir)
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}
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deps = append(deps, sharedLibs...)
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deps = append(deps, staticLibs...)
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deps = append(deps, lateStaticLibs...)
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deps = append(deps, wholeStaticLibs...)
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if crtBegin.Valid() {
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deps = append(deps, crtBegin.Path(), crtEnd.Path())
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}
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ctx.ModuleBuild(pctx, android.ModuleBuildParams{
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Rule: ld,
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Output: outputFile,
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Inputs: objFiles,
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Implicits: deps,
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Args: map[string]string{
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"ldCmd": ldCmd,
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"ldDirFlags": ldDirsToFlags(ldDirs),
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"crtBegin": crtBegin.String(),
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"libFlags": strings.Join(libFlagsList, " "),
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"ldFlags": flags.ldFlags,
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"crtEnd": crtEnd.String(),
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},
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})
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}
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// Generate a rule for compiling multiple .o files to a .o using ld partial linking
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func TransformObjsToObj(ctx android.ModuleContext, objFiles android.Paths,
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flags builderFlags, outputFile android.WritablePath) {
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var ldCmd string
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if flags.clang {
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ldCmd = "${clangBin}clang++"
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} else {
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ldCmd = gccCmd(flags.toolchain, "g++")
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}
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ctx.ModuleBuild(pctx, android.ModuleBuildParams{
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Rule: partialLd,
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Output: outputFile,
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Inputs: objFiles,
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Args: map[string]string{
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"ldCmd": ldCmd,
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"ldFlags": flags.ldFlags,
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},
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})
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}
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// Generate a rule for runing objcopy --prefix-symbols on a binary
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func TransformBinaryPrefixSymbols(ctx android.ModuleContext, prefix string, inputFile android.Path,
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flags builderFlags, outputFile android.WritablePath) {
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objcopyCmd := gccCmd(flags.toolchain, "objcopy")
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ctx.ModuleBuild(pctx, android.ModuleBuildParams{
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Rule: prefixSymbols,
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Output: outputFile,
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Input: inputFile,
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Args: map[string]string{
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"objcopyCmd": objcopyCmd,
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"prefix": prefix,
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},
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})
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}
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func TransformStrip(ctx android.ModuleContext, inputFile android.Path,
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outputFile android.WritablePath, flags builderFlags) {
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crossCompile := gccCmd(flags.toolchain, "")
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args := ""
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if flags.stripAddGnuDebuglink {
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args += " --add-gnu-debuglink"
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}
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if flags.stripKeepMiniDebugInfo {
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args += " --keep-mini-debug-info"
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}
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if flags.stripKeepSymbols {
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args += " --keep-symbols"
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}
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ctx.ModuleBuild(pctx, android.ModuleBuildParams{
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Rule: strip,
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Output: outputFile,
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Input: inputFile,
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Args: map[string]string{
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"crossCompile": crossCompile,
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"args": args,
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},
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})
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}
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func TransformDarwinStrip(ctx android.ModuleContext, inputFile android.Path,
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outputFile android.WritablePath) {
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ctx.ModuleBuild(pctx, android.ModuleBuildParams{
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Rule: darwinStrip,
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Output: outputFile,
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Input: inputFile,
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})
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}
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func CopyGccLib(ctx android.ModuleContext, libName string,
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flags builderFlags, outputFile android.WritablePath) {
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ctx.ModuleBuild(pctx, android.ModuleBuildParams{
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Rule: copyGccLib,
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Output: outputFile,
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Args: map[string]string{
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"ccCmd": gccCmd(flags.toolchain, "gcc"),
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"cFlags": flags.globalFlags,
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"libName": libName,
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},
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})
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}
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func gccCmd(toolchain Toolchain, cmd string) string {
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return filepath.Join(toolchain.GccRoot(), "bin", toolchain.GccTriple()+"-"+cmd)
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}
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func splitListForSize(list []string, limit int) (lists [][]string, err error) {
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var i int
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start := 0
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bytes := 0
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for i = range list {
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l := len(list[i])
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if l > limit {
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return nil, fmt.Errorf("list element greater than size limit (%d)", limit)
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}
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if bytes+l > limit {
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lists = append(lists, list[start:i])
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start = i
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bytes = 0
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}
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bytes += l + 1 // count a space between each list element
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}
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lists = append(lists, list[start:])
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totalLen := 0
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for _, l := range lists {
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totalLen += len(l)
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}
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if totalLen != len(list) {
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panic(fmt.Errorf("Failed breaking up list, %d != %d", len(list), totalLen))
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|
}
|
|
return lists, nil
|
|
}
|