Ejemplo n.º 1
0
  private void createHeaderAction(
      String outputName,
      Builder result,
      AnalysisEnvironment env,
      CppCompileActionBuilder builder,
      boolean generateDotd) {
    String outputNameBase =
        CppHelper.getCompileArtifactName(
            ruleContext, ArtifactCategory.GENERATED_HEADER, outputName);

    builder
        .setOutputs(ArtifactCategory.PROCESSED_HEADER, outputNameBase, generateDotd)
        // If we generate pic actions, we prefer the header actions to use the pic artifacts.
        .setPicMode(this.getGeneratePicActions());
    setupCompileBuildVariables(
        builder,
        this.getGeneratePicActions(),
        /*ccRelativeName=*/ null,
        /*autoFdoImportPath=*/ null,
        /*gcnoFile=*/ null,
        /*dwoFile=*/ null,
        ImmutableMap.<String, String>of());
    semantics.finalizeCompileActionBuilder(ruleContext, builder);
    CppCompileAction compileAction = builder.build();
    env.registerAction(compileAction);
    Artifact tokenFile = compileAction.getOutputFile();
    result.addHeaderTokenFile(tokenFile);
  }
Ejemplo n.º 2
0
  private void createFakeSourceAction(
      String outputName,
      CcCompilationOutputs.Builder result,
      AnalysisEnvironment env,
      CppCompileActionBuilder builder,
      ArtifactCategory outputCategory,
      boolean addObject,
      PathFragment ccRelativeName,
      PathFragment execPath,
      boolean usePic,
      boolean generateDotd) {
    String outputNameBase = getOutputNameBaseWith(outputName, usePic);
    String tempOutputName =
        ruleContext
            .getConfiguration()
            .getBinFragment()
            .getRelative(CppHelper.getObjDirectory(ruleContext.getLabel()))
            .getRelative(
                CppHelper.getCompileArtifactName(
                    ruleContext,
                    outputCategory,
                    getOutputNameBaseWith(outputName + ".temp", usePic)))
            .getPathString();
    builder
        .setPicMode(usePic)
        .setOutputs(outputCategory, outputNameBase, generateDotd)
        .setTempOutputFile(new PathFragment(tempOutputName));

    setupCompileBuildVariables(
        builder,
        usePic,
        ccRelativeName,
        execPath,
        /*gcnoFile=*/ null,
        /*dwoFile=*/ null,
        ImmutableMap.<String, String>of());
    semantics.finalizeCompileActionBuilder(ruleContext, builder);
    CppCompileAction action = builder.build();
    env.registerAction(action);
    if (addObject) {
      if (usePic) {
        result.addPicObjectFile(action.getOutputFile());
      } else {
        result.addObjectFile(action.getOutputFile());
      }
    }
  }
Ejemplo n.º 3
0
  /**
   * Constructs the C++ linker actions. It generally generates two actions, one for a static library
   * and one for a dynamic library. If PIC is required for shared libraries, but not for binaries,
   * it additionally creates a third action to generate a PIC static library.
   *
   * <p>For dynamic libraries, this method can additionally create an interface shared library that
   * can be used for linking, but doesn't contain any executable code. This increases the number of
   * cache hits for link actions. Call {@link #setAllowInterfaceSharedObjects(boolean)} to enable
   * this behavior.
   *
   * @throws RuleErrorException
   */
  public CcLinkingOutputs createCcLinkActions(CcCompilationOutputs ccOutputs)
      throws RuleErrorException {
    // For now only handle static links. Note that the dynamic library link below ignores linkType.
    // TODO(bazel-team): Either support non-static links or move this check to setLinkType().
    Preconditions.checkState(linkType.isStaticLibraryLink(), "can only handle static links");

    CcLinkingOutputs.Builder result = new CcLinkingOutputs.Builder();
    if (cppConfiguration.isLipoContextCollector()) {
      // Don't try to create LIPO link actions in collector mode,
      // because it needs some data that's not available at this point.
      return result.build();
    }

    AnalysisEnvironment env = ruleContext.getAnalysisEnvironment();
    boolean usePicForBinaries = CppHelper.usePic(ruleContext, true);
    boolean usePicForSharedLibs = CppHelper.usePic(ruleContext, false);

    // Create static library (.a). The linkType only reflects whether the library is alwayslink or
    // not. The PIC-ness is determined by whether we need to use PIC or not. There are three cases
    // for (usePicForSharedLibs usePicForBinaries):
    //
    // (1) (false false) -> no pic code
    // (2) (true false)  -> shared libraries as pic, but not binaries
    // (3) (true true)   -> both shared libraries and binaries as pic
    //
    // In case (3), we always need PIC, so only create one static library containing the PIC object
    // files. The name therefore does not match the content.
    //
    // Presumably, it is done this way because the .a file is an implicit output of every cc_library
    // rule, so we can't use ".pic.a" that in the always-PIC case.

    // If the crosstool is configured to select an output artifact, we use that selection.
    // Otherwise, we use linux defaults.
    Artifact linkedArtifact = getLinkedArtifact(linkType);

    CppLinkAction maybePicAction =
        newLinkActionBuilder(linkedArtifact)
            .addNonLibraryInputs(ccOutputs.getObjectFiles(usePicForBinaries))
            .addNonLibraryInputs(ccOutputs.getHeaderTokenFiles())
            .addLTOBitcodeFiles(ccOutputs.getLtoBitcodeFiles())
            .setLinkType(linkType)
            .setLinkStaticness(LinkStaticness.FULLY_STATIC)
            .setFeatureConfiguration(featureConfiguration)
            .build();
    env.registerAction(maybePicAction);
    result.addStaticLibrary(maybePicAction.getOutputLibrary());

    // Create a second static library (.pic.a). Only in case (2) do we need both PIC and non-PIC
    // static libraries. In that case, the first static library contains the non-PIC code, and this
    // one contains the PIC code, so the names match the content.
    if (!usePicForBinaries && usePicForSharedLibs) {
      LinkTargetType picLinkType =
          (linkType == LinkTargetType.ALWAYS_LINK_STATIC_LIBRARY)
              ? LinkTargetType.ALWAYS_LINK_PIC_STATIC_LIBRARY
              : LinkTargetType.PIC_STATIC_LIBRARY;

      // If the crosstool is configured to select an output artifact, we use that selection.
      // Otherwise, we use linux defaults.
      Artifact picArtifact = getLinkedArtifact(picLinkType);

      CppLinkAction picAction =
          newLinkActionBuilder(picArtifact)
              .addNonLibraryInputs(ccOutputs.getObjectFiles(true))
              .addNonLibraryInputs(ccOutputs.getHeaderTokenFiles())
              .addLTOBitcodeFiles(ccOutputs.getLtoBitcodeFiles())
              .setLinkType(picLinkType)
              .setLinkStaticness(LinkStaticness.FULLY_STATIC)
              .setFeatureConfiguration(featureConfiguration)
              .build();
      env.registerAction(picAction);
      result.addPicStaticLibrary(picAction.getOutputLibrary());
    }

    if (!createDynamicLibrary) {
      return result.build();
    }

    // Create dynamic library.
    Artifact soImpl;
    if (soImplArtifact == null) {
      // If the crosstool is configured to select an output artifact, we use that selection.
      // Otherwise, we use linux defaults.
      soImpl = getLinkedArtifact(LinkTargetType.DYNAMIC_LIBRARY);
    } else {
      soImpl = soImplArtifact;
    }

    List<String> sonameLinkopts = ImmutableList.of();
    Artifact soInterface = null;
    if (cppConfiguration.useInterfaceSharedObjects() && allowInterfaceSharedObjects) {
      soInterface =
          CppHelper.getLinuxLinkedArtifact(ruleContext, LinkTargetType.INTERFACE_DYNAMIC_LIBRARY);
      sonameLinkopts =
          ImmutableList.of(
              "-Wl,-soname="
                  + SolibSymlinkAction.getDynamicLibrarySoname(
                      soImpl.getRootRelativePath(), false));
    }

    // Should we also link in any libraries that this library depends on?
    // That is required on some systems...
    CppLinkActionBuilder linkActionBuilder =
        newLinkActionBuilder(soImpl)
            .setInterfaceOutput(soInterface)
            .addNonLibraryInputs(ccOutputs.getObjectFiles(usePicForSharedLibs))
            .addNonLibraryInputs(ccOutputs.getHeaderTokenFiles())
            .addLTOBitcodeFiles(ccOutputs.getLtoBitcodeFiles())
            .setLinkType(LinkTargetType.DYNAMIC_LIBRARY)
            .setLinkStaticness(LinkStaticness.DYNAMIC)
            .addLinkopts(linkopts)
            .addLinkopts(sonameLinkopts)
            .setRuntimeInputs(
                CppHelper.getToolchain(ruleContext).getDynamicRuntimeLinkMiddleman(),
                CppHelper.getToolchain(ruleContext).getDynamicRuntimeLinkInputs())
            .setFeatureConfiguration(featureConfiguration);

    if (!ccOutputs.getLtoBitcodeFiles().isEmpty()
        && featureConfiguration.isEnabled(CppRuleClasses.THIN_LTO)) {
      linkActionBuilder.setLTOIndexing(true);
      CppLinkAction indexAction = linkActionBuilder.build();
      env.registerAction(indexAction);

      for (LTOBackendArtifacts ltoArtifacts : indexAction.getAllLTOBackendArtifacts()) {
        ltoArtifacts.scheduleLTOBackendAction(ruleContext, usePicForSharedLibs);
      }

      linkActionBuilder.setLTOIndexing(false);
    }

    CppLinkAction action = linkActionBuilder.build();
    env.registerAction(action);

    LibraryToLink dynamicLibrary = action.getOutputLibrary();
    LibraryToLink interfaceLibrary = action.getInterfaceOutputLibrary();
    if (interfaceLibrary == null) {
      interfaceLibrary = dynamicLibrary;
    }

    // If shared library has neverlink=1, then leave it untouched. Otherwise,
    // create a mangled symlink for it and from now on reference it through
    // mangled name only.
    if (neverLink) {
      result.addDynamicLibrary(interfaceLibrary);
      result.addExecutionDynamicLibrary(dynamicLibrary);
    } else {
      LibraryToLink libraryLink =
          SolibSymlinkAction.getDynamicLibrarySymlink(
              ruleContext,
              interfaceLibrary.getArtifact(),
              false,
              false,
              ruleContext.getConfiguration());
      result.addDynamicLibrary(libraryLink);
      LibraryToLink implLibraryLink =
          SolibSymlinkAction.getDynamicLibrarySymlink(
              ruleContext,
              dynamicLibrary.getArtifact(),
              false,
              false,
              ruleContext.getConfiguration());
      result.addExecutionDynamicLibrary(implLibraryLink);
    }
    return result.build();
  }
Ejemplo n.º 4
0
  private void createSourceAction(
      String outputName,
      CcCompilationOutputs.Builder result,
      AnalysisEnvironment env,
      Artifact sourceArtifact,
      CppCompileActionBuilder builder,
      ArtifactCategory outputCategory,
      boolean addObject,
      boolean enableCoverage,
      boolean generateDwo,
      boolean generateDotd,
      Map<String, String> sourceSpecificBuildVariables) {
    PathFragment ccRelativeName = semantics.getEffectiveSourcePath(sourceArtifact);
    if (cppConfiguration.isLipoOptimization()) {
      // TODO(bazel-team): we shouldn't be needing this, merging context with the binary
      // is a superset of necessary information.
      LipoContextProvider lipoProvider =
          Preconditions.checkNotNull(CppHelper.getLipoContextProvider(ruleContext), outputName);
      builder.setContext(
          CppCompilationContext.mergeForLipo(lipoProvider.getLipoContext(), context));
    }

    boolean generatePicAction = getGeneratePicActions();
    // If we always need pic for everything, then don't bother to create a no-pic action.
    boolean generateNoPicAction = getGenerateNoPicActions();
    Preconditions.checkState(generatePicAction || generateNoPicAction);
    if (fake) {
      boolean usePic = !generateNoPicAction;
      createFakeSourceAction(
          outputName,
          result,
          env,
          builder,
          outputCategory,
          addObject,
          ccRelativeName,
          sourceArtifact.getExecPath(),
          usePic,
          generateDotd);
    } else {
      // Create PIC compile actions (same as non-PIC, but use -fPIC and
      // generate .pic.o, .pic.d, .pic.gcno instead of .o, .d, .gcno.)
      if (generatePicAction) {
        String picOutputBase =
            CppHelper.getCompileArtifactName(ruleContext, ArtifactCategory.PIC_FILE, outputName);
        CppCompileActionBuilder picBuilder =
            copyAsPicBuilder(builder, picOutputBase, outputCategory, generateDotd);
        String gcnoFileName =
            CppHelper.getCompileArtifactName(
                ruleContext, ArtifactCategory.COVERAGE_DATA_FILE, picOutputBase);
        Artifact gcnoFile =
            enableCoverage ? CppHelper.getCompileOutputArtifact(ruleContext, gcnoFileName) : null;
        Artifact dwoFile = generateDwo ? getDwoFile(picBuilder.getOutputFile()) : null;

        setupCompileBuildVariables(
            picBuilder,
            /*usePic=*/ true,
            ccRelativeName,
            sourceArtifact.getExecPath(),
            gcnoFile,
            dwoFile,
            sourceSpecificBuildVariables);

        if (maySaveTemps) {
          result.addTemps(
              createTempsActions(
                  sourceArtifact,
                  outputName,
                  picBuilder,
                  /*usePic=*/ true,
                  /*generateDotd=*/ generateDotd,
                  ccRelativeName));
        }

        picBuilder.setGcnoFile(gcnoFile);
        picBuilder.setDwoFile(dwoFile);

        semantics.finalizeCompileActionBuilder(ruleContext, picBuilder);
        CppCompileAction picAction = picBuilder.build();
        env.registerAction(picAction);
        if (addObject) {
          result.addPicObjectFile(picAction.getOutputFile());

          if (featureConfiguration.isEnabled(CppRuleClasses.THIN_LTO)
              && CppFileTypes.LTO_SOURCE.matches(sourceArtifact.getFilename())) {
            result.addLTOBitcodeFile(picAction.getOutputFile());
          }
        }
        if (dwoFile != null) {
          // Host targets don't produce .dwo files.
          result.addPicDwoFile(dwoFile);
        }
        if (cppConfiguration.isLipoContextCollector() && !generateNoPicAction) {
          result.addLipoScannable(picAction);
        }
      }

      if (generateNoPicAction) {
        Artifact noPicOutputFile =
            CppHelper.getCompileOutputArtifact(
                ruleContext,
                CppHelper.getCompileArtifactName(ruleContext, outputCategory, outputName));
        builder.setOutputs(outputCategory, outputName, generateDotd);
        String gcnoFileName =
            CppHelper.getCompileArtifactName(
                ruleContext, ArtifactCategory.COVERAGE_DATA_FILE, outputName);

        // Create non-PIC compile actions
        Artifact gcnoFile =
            !cppConfiguration.isLipoOptimization() && enableCoverage
                ? CppHelper.getCompileOutputArtifact(ruleContext, gcnoFileName)
                : null;

        Artifact noPicDwoFile = generateDwo ? getDwoFile(noPicOutputFile) : null;

        setupCompileBuildVariables(
            builder,
            /*usePic=*/ false,
            ccRelativeName,
            sourceArtifact.getExecPath(),
            gcnoFile,
            noPicDwoFile,
            sourceSpecificBuildVariables);

        if (maySaveTemps) {
          result.addTemps(
              createTempsActions(
                  sourceArtifact,
                  outputName,
                  builder,
                  /*usePic=*/ false,
                  /*generateDotd*/ generateDotd,
                  ccRelativeName));
        }

        builder.setGcnoFile(gcnoFile);
        builder.setDwoFile(noPicDwoFile);

        semantics.finalizeCompileActionBuilder(ruleContext, builder);
        CppCompileAction compileAction = builder.build();
        env.registerAction(compileAction);
        Artifact objectFile = compileAction.getOutputFile();
        if (addObject) {
          result.addObjectFile(objectFile);
          if (featureConfiguration.isEnabled(CppRuleClasses.THIN_LTO)
              && CppFileTypes.LTO_SOURCE.matches(sourceArtifact.getFilename())) {
            result.addLTOBitcodeFile(objectFile);
          }
        }
        if (noPicDwoFile != null) {
          // Host targets don't produce .dwo files.
          result.addDwoFile(noPicDwoFile);
        }
        if (cppConfiguration.isLipoContextCollector()) {
          result.addLipoScannable(compileAction);
        }
      }
    }
  }