C++ PassManagerBase::add方法代码示例

static void addCoroutineSCCPasses(const PassManagerBuilder &Builder,
                                  legacy::PassManagerBase &PM) {
  PM.add(createCoroSplitPass());
}

static void addAddressSanitizerPasses(const PassManagerBuilder &Builder,
                                      legacy::PassManagerBase &PM) {
  PM.add(createAddressSanitizerFunctionPass());
  PM.add(createAddressSanitizerModulePass());
}

void PassManagerBuilder::addLTOOptimizationPasses(legacy::PassManagerBase &PM) {
  // Load sample profile before running the LTO optimization pipeline.
  if (!PGOSampleUse.empty()) {
    PM.add(createPruneEHPass());
    PM.add(createSampleProfileLoaderPass(PGOSampleUse));
  }

  // Remove unused virtual tables to improve the quality of code generated by
  // whole-program devirtualization and bitset lowering.
  PM.add(createGlobalDCEPass());

  // Provide AliasAnalysis services for optimizations.
  addInitialAliasAnalysisPasses(PM);

  // Allow forcing function attributes as a debugging and tuning aid.
  PM.add(createForceFunctionAttrsLegacyPass());

  // Infer attributes about declarations if possible.
  PM.add(createInferFunctionAttrsLegacyPass());

  if (OptLevel > 1) {
    // Split call-site with more constrained arguments.
    PM.add(createCallSiteSplittingPass());

    // Indirect call promotion. This should promote all the targets that are
    // left by the earlier promotion pass that promotes intra-module targets.
    // This two-step promotion is to save the compile time. For LTO, it should
    // produce the same result as if we only do promotion here.
    PM.add(
        createPGOIndirectCallPromotionLegacyPass(true, !PGOSampleUse.empty()));

    // Propagate constants at call sites into the functions they call.  This
    // opens opportunities for globalopt (and inlining) by substituting function
    // pointers passed as arguments to direct uses of functions.
    PM.add(createIPSCCPPass());

    // Attach metadata to indirect call sites indicating the set of functions
    // they may target at run-time. This should follow IPSCCP.
    PM.add(createCalledValuePropagationPass());
  }

  // Infer attributes about definitions. The readnone attribute in particular is
  // required for virtual constant propagation.
  PM.add(createPostOrderFunctionAttrsLegacyPass());
  PM.add(createReversePostOrderFunctionAttrsPass());

  // Split globals using inrange annotations on GEP indices. This can help
  // improve the quality of generated code when virtual constant propagation or
  // control flow integrity are enabled.
  PM.add(createGlobalSplitPass());

  // Apply whole-program devirtualization and virtual constant propagation.
  PM.add(createWholeProgramDevirtPass(ExportSummary, nullptr));

  // That's all we need at opt level 1.
  if (OptLevel == 1)
    return;

  // Now that we internalized some globals, see if we can hack on them!
  PM.add(createGlobalOptimizerPass());
  // Promote any localized global vars.
  PM.add(createPromoteMemoryToRegisterPass());

  // Linking modules together can lead to duplicated global constants, only
  // keep one copy of each constant.
  PM.add(createConstantMergePass());

  // Remove unused arguments from functions.
  PM.add(createDeadArgEliminationPass());

  // Reduce the code after globalopt and ipsccp.  Both can open up significant
  // simplification opportunities, and both can propagate functions through
  // function pointers.  When this happens, we often have to resolve varargs
  // calls, etc, so let instcombine do this.
  if (OptLevel > 2)
    PM.add(createAggressiveInstCombinerPass());
  addInstructionCombiningPass(PM);
  addExtensionsToPM(EP_Peephole, PM);

  // Inline small functions
  bool RunInliner = Inliner;
  if (RunInliner) {
    PM.add(Inliner);
    Inliner = nullptr;
  }

  PM.add(createPruneEHPass());   // Remove dead EH info.

  // CSFDO instrumentation and use pass.
  addPGOInstrPasses(PM, /* IsCS */ true);

  // Optimize globals again if we ran the inliner.
  if (RunInliner)
    PM.add(createGlobalOptimizerPass());
  PM.add(createGlobalDCEPass()); // Remove dead functions.

  // If we didn't decide to inline a function, check to see if we can
  // transform it to pass arguments by value instead of by reference.
  PM.add(createArgumentPromotionPass());

//.........这里部分代码省略.........

static void addBoundsCheckingPass(const PassManagerBuilder &Builder,
                                    legacy::PassManagerBase &PM) {
  PM.add(createBoundsCheckingPass());
}

void PassManagerBuilder::addLTOOptimizationPasses(legacy::PassManagerBase &PM) {
  // Provide AliasAnalysis services for optimizations.
  addInitialAliasAnalysisPasses(PM);

  // Propagate constants at call sites into the functions they call.  This
  // opens opportunities for globalopt (and inlining) by substituting function
  // pointers passed as arguments to direct uses of functions.
  PM.add(createIPSCCPPass());

  // Now that we internalized some globals, see if we can hack on them!
  PM.add(createGlobalOptimizerPass());

  // Linking modules together can lead to duplicated global constants, only
  // keep one copy of each constant.
  PM.add(createConstantMergePass());

  // Remove unused arguments from functions.
  PM.add(createDeadArgEliminationPass());

  // Reduce the code after globalopt and ipsccp.  Both can open up significant
  // simplification opportunities, and both can propagate functions through
  // function pointers.  When this happens, we often have to resolve varargs
  // calls, etc, so let instcombine do this.
  PM.add(createInstructionCombiningPass());
  addExtensionsToPM(EP_Peephole, PM);

  // Inline small functions
  bool RunInliner = Inliner;
  if (RunInliner) {
    PM.add(Inliner);
    Inliner = nullptr;
  }

  PM.add(createPruneEHPass());   // Remove dead EH info.

  // Optimize globals again if we ran the inliner.
  if (RunInliner)
    PM.add(createGlobalOptimizerPass());
  PM.add(createGlobalDCEPass()); // Remove dead functions.

  // If we didn't decide to inline a function, check to see if we can
  // transform it to pass arguments by value instead of by reference.
  PM.add(createArgumentPromotionPass());

  // The IPO passes may leave cruft around.  Clean up after them.
  PM.add(createInstructionCombiningPass());
  addExtensionsToPM(EP_Peephole, PM);
  PM.add(createJumpThreadingPass());

  // Break up allocas
  if (UseNewSROA)
    PM.add(createSROAPass());
  else
    PM.add(createScalarReplAggregatesPass());

  // Run a few AA driven optimizations here and now, to cleanup the code.
  PM.add(createFunctionAttrsPass()); // Add nocapture.
  PM.add(createGlobalsModRefPass()); // IP alias analysis.

  PM.add(createLICMPass());                 // Hoist loop invariants.
  if (EnableMLSM)
    PM.add(createMergedLoadStoreMotionPass()); // Merge ld/st in diamonds.
  PM.add(createGVNPass(DisableGVNLoadPRE)); // Remove redundancies.
  PM.add(createMemCpyOptPass());            // Remove dead memcpys.

  // Nuke dead stores.
  PM.add(createDeadStoreEliminationPass());

  // More loops are countable; try to optimize them.
  PM.add(createIndVarSimplifyPass());
  PM.add(createLoopDeletionPass());
  if (EnableLoopInterchange)
    PM.add(createLoopInterchangePass());

  PM.add(createLoopVectorizePass(true, LoopVectorize));

  // More scalar chains could be vectorized due to more alias information
  if (RunSLPAfterLoopVectorization)
    if (SLPVectorize)
      PM.add(createSLPVectorizerPass()); // Vectorize parallel scalar chains.

  // After vectorization, assume intrinsics may tell us more about pointer
  // alignments.
  PM.add(createAlignmentFromAssumptionsPass());

  if (LoadCombine)
    PM.add(createLoadCombinePass());

  // Cleanup and simplify the code after the scalar optimizations.
  PM.add(createInstructionCombiningPass());
  addExtensionsToPM(EP_Peephole, PM);

  PM.add(createJumpThreadingPass());
}

void PassManagerBuilder::addFunctionSimplificationPasses(
    legacy::PassManagerBase &MPM) {
  // Start of function pass.
  // Break up aggregate allocas, using SSAUpdater.
  MPM.add(createSROAPass());
  MPM.add(createEarlyCSEPass(true /* Enable mem-ssa. */)); // Catch trivial redundancies
  if (EnableGVNHoist)
    MPM.add(createGVNHoistPass());
  if (EnableGVNSink) {
    MPM.add(createGVNSinkPass());
    MPM.add(createCFGSimplificationPass());
  }

  // Speculative execution if the target has divergent branches; otherwise nop.
  MPM.add(createSpeculativeExecutionIfHasBranchDivergencePass());
  MPM.add(createJumpThreadingPass());         // Thread jumps.
  MPM.add(createCorrelatedValuePropagationPass()); // Propagate conditionals
  MPM.add(createCFGSimplificationPass());     // Merge & remove BBs
  // Combine silly seq's
  if (OptLevel > 2)
    MPM.add(createAggressiveInstCombinerPass());
  addInstructionCombiningPass(MPM);
  if (SizeLevel == 0 && !DisableLibCallsShrinkWrap)
    MPM.add(createLibCallsShrinkWrapPass());
  addExtensionsToPM(EP_Peephole, MPM);

  // Optimize memory intrinsic calls based on the profiled size information.
  if (SizeLevel == 0)
    MPM.add(createPGOMemOPSizeOptLegacyPass());

  MPM.add(createTailCallEliminationPass()); // Eliminate tail calls
  MPM.add(createCFGSimplificationPass());     // Merge & remove BBs
  MPM.add(createReassociatePass());           // Reassociate expressions

  // Begin the loop pass pipeline.
  if (EnableSimpleLoopUnswitch) {
    // The simple loop unswitch pass relies on separate cleanup passes. Schedule
    // them first so when we re-process a loop they run before other loop
    // passes.
    MPM.add(createLoopInstSimplifyPass());
    MPM.add(createLoopSimplifyCFGPass());
  }
  // Rotate Loop - disable header duplication at -Oz
  MPM.add(createLoopRotatePass(SizeLevel == 2 ? 0 : -1));
  MPM.add(createLICMPass(LicmMssaOptCap, LicmMssaNoAccForPromotionCap));
  if (EnableSimpleLoopUnswitch)
    MPM.add(createSimpleLoopUnswitchLegacyPass());
  else
    MPM.add(createLoopUnswitchPass(SizeLevel || OptLevel < 3, DivergentTarget));
  // FIXME: We break the loop pass pipeline here in order to do full
  // simplify-cfg. Eventually loop-simplifycfg should be enhanced to replace the
  // need for this.
  MPM.add(createCFGSimplificationPass());
  addInstructionCombiningPass(MPM);
  // We resume loop passes creating a second loop pipeline here.
  MPM.add(createIndVarSimplifyPass());        // Canonicalize indvars
  MPM.add(createLoopIdiomPass());             // Recognize idioms like memset.
  addExtensionsToPM(EP_LateLoopOptimizations, MPM);
  MPM.add(createLoopDeletionPass());          // Delete dead loops

  if (EnableLoopInterchange)
    MPM.add(createLoopInterchangePass()); // Interchange loops

  // Unroll small loops
  MPM.add(createSimpleLoopUnrollPass(OptLevel, DisableUnrollLoops,
                                     ForgetAllSCEVInLoopUnroll));
  addExtensionsToPM(EP_LoopOptimizerEnd, MPM);
  // This ends the loop pass pipelines.

  if (OptLevel > 1) {
    MPM.add(createMergedLoadStoreMotionPass()); // Merge ld/st in diamonds
    MPM.add(NewGVN ? createNewGVNPass()
                   : createGVNPass(DisableGVNLoadPRE)); // Remove redundancies
  }
  MPM.add(createMemCpyOptPass());             // Remove memcpy / form memset
  MPM.add(createSCCPPass());                  // Constant prop with SCCP

  // Delete dead bit computations (instcombine runs after to fold away the dead
  // computations, and then ADCE will run later to exploit any new DCE
  // opportunities that creates).
  MPM.add(createBitTrackingDCEPass());        // Delete dead bit computations

  // Run instcombine after redundancy elimination to exploit opportunities
  // opened up by them.
  addInstructionCombiningPass(MPM);
  addExtensionsToPM(EP_Peephole, MPM);
  MPM.add(createJumpThreadingPass());         // Thread jumps
  MPM.add(createCorrelatedValuePropagationPass());
  MPM.add(createDeadStoreEliminationPass());  // Delete dead stores
  MPM.add(createLICMPass(LicmMssaOptCap, LicmMssaNoAccForPromotionCap));

  addExtensionsToPM(EP_ScalarOptimizerLate, MPM);

  if (RerollLoops)
    MPM.add(createLoopRerollPass());

  MPM.add(createAggressiveDCEPass());         // Delete dead instructions
  MPM.add(createCFGSimplificationPass()); // Merge & remove BBs
  // Clean up after everything.
  addInstructionCombiningPass(MPM);
//.........这里部分代码省略.........

static void addInstructionCombiningPass(const PassManagerBuilder &Builder,
                                        legacy::PassManagerBase &PM) {
  PM.add(createInstructionCombiningPass());
}

void PassManagerBuilder::populateModulePassManager(
    legacy::PassManagerBase &MPM) {
  // Allow forcing function attributes as a debugging and tuning aid.
  MPM.add(createForceFunctionAttrsLegacyPass());

  // If all optimizations are disabled, just run the always-inline pass and,
  // if enabled, the function merging pass.
  if (OptLevel == 0) {
    addPGOInstrPasses(MPM);
    if (Inliner) {
      MPM.add(Inliner);
      Inliner = nullptr;
    }

    // FIXME: The BarrierNoopPass is a HACK! The inliner pass above implicitly
    // creates a CGSCC pass manager, but we don't want to add extensions into
    // that pass manager. To prevent this we insert a no-op module pass to reset
    // the pass manager to get the same behavior as EP_OptimizerLast in non-O0
    // builds. The function merging pass is
    if (MergeFunctions)
      MPM.add(createMergeFunctionsPass());
    else if (!GlobalExtensions->empty() || !Extensions.empty())
      MPM.add(createBarrierNoopPass());

    addExtensionsToPM(EP_EnabledOnOptLevel0, MPM);
    return;
  }

  // Add LibraryInfo if we have some.
  if (LibraryInfo)
    MPM.add(new TargetLibraryInfoWrapperPass(*LibraryInfo));

  addInitialAliasAnalysisPasses(MPM);

  if (!DisableUnitAtATime) {
    // Infer attributes about declarations if possible.
    MPM.add(createInferFunctionAttrsLegacyPass());

    addExtensionsToPM(EP_ModuleOptimizerEarly, MPM);

    MPM.add(createIPSCCPPass());          // IP SCCP
    MPM.add(createGlobalOptimizerPass()); // Optimize out global vars
    // Promote any localized global vars.
    MPM.add(createPromoteMemoryToRegisterPass());

    MPM.add(createDeadArgEliminationPass()); // Dead argument elimination

    MPM.add(createInstructionCombiningPass()); // Clean up after IPCP & DAE
    addExtensionsToPM(EP_Peephole, MPM);
    MPM.add(createCFGSimplificationPass()); // Clean up after IPCP & DAE
  }

  if (!PerformThinLTO)
    /// PGO instrumentation is added during the compile phase for ThinLTO, do
    /// not run it a second time
    addPGOInstrPasses(MPM);

  if (EnableNonLTOGlobalsModRef)
    // We add a module alias analysis pass here. In part due to bugs in the
    // analysis infrastructure this "works" in that the analysis stays alive
    // for the entire SCC pass run below.
    MPM.add(createGlobalsAAWrapperPass());

  // Start of CallGraph SCC passes.
  if (!DisableUnitAtATime)
    MPM.add(createPruneEHPass()); // Remove dead EH info
  if (Inliner) {
    MPM.add(Inliner);
    Inliner = nullptr;
  }
  if (!DisableUnitAtATime)
    MPM.add(createPostOrderFunctionAttrsLegacyPass());
  if (OptLevel > 2)
    MPM.add(createArgumentPromotionPass()); // Scalarize uninlined fn args

  addFunctionSimplificationPasses(MPM);

  // If we are planning to perform ThinLTO later, let's not bloat the code with
  // unrolling/vectorization/... now. We'll first run the inliner + CGSCC passes
  // during ThinLTO and perform the rest of the optimizations afterward.
  if (PrepareForThinLTO)
    return;

  // FIXME: This is a HACK! The inliner pass above implicitly creates a CGSCC
  // pass manager that we are specifically trying to avoid. To prevent this
  // we must insert a no-op module pass to reset the pass manager.
  MPM.add(createBarrierNoopPass());

  // Scheduling LoopVersioningLICM when inlining is over, because after that
  // we may see more accurate aliasing. Reason to run this late is that too
  // early versioning may prevent further inlining due to increase of code
  // size. By placing it just after inlining other optimizations which runs 
  // later might get benefit of no-alias assumption in clone loop. 
  if (UseLoopVersioningLICM) {
    MPM.add(createLoopVersioningLICMPass());    // Do LoopVersioningLICM
    MPM.add(createLICMPass());                  // Hoist loop invariants
  }

  if (!DisableUnitAtATime)
    MPM.add(createReversePostOrderFunctionAttrsPass());
//.........这里部分代码省略.........

static void loadPass(const PassManagerBuilder &Builder, legacy::PassManagerBase &PM) {
  PM.add(new Hello());
}

static void
registerClangPass(const PassManagerBuilder &, legacy::PassManagerBase &PM) {
    PM.add(new Scatter());
}

void PassManagerBuilder::addLTOOptimizationPasses(legacy::PassManagerBase &PM) {
  // Provide AliasAnalysis services for optimizations.
  addInitialAliasAnalysisPasses(PM);

  if (ModuleSummary)
    PM.add(createFunctionImportPass(ModuleSummary));

  // Allow forcing function attributes as a debugging and tuning aid.
  PM.add(createForceFunctionAttrsLegacyPass());

  // Infer attributes about declarations if possible.
  PM.add(createInferFunctionAttrsLegacyPass());

  // Indirect call promotion. This should promote all the targets that are left
  // by the earlier promotion pass that promotes intra-module targets.
  // This two-step promotion is to save the compile time. For LTO, it should
  // produce the same result as if we only do promotion here.
  PM.add(createPGOIndirectCallPromotionPass(true));

  // Propagate constants at call sites into the functions they call.  This
  // opens opportunities for globalopt (and inlining) by substituting function
  // pointers passed as arguments to direct uses of functions.
  PM.add(createIPSCCPPass());

  // Now that we internalized some globals, see if we can hack on them!
  PM.add(createPostOrderFunctionAttrsLegacyPass());
  PM.add(createReversePostOrderFunctionAttrsPass());
  PM.add(createGlobalOptimizerPass());
  // Promote any localized global vars.
  PM.add(createPromoteMemoryToRegisterPass());

  // Linking modules together can lead to duplicated global constants, only
  // keep one copy of each constant.
  PM.add(createConstantMergePass());

  // Remove unused arguments from functions.
  PM.add(createDeadArgEliminationPass());

  // Reduce the code after globalopt and ipsccp.  Both can open up significant
  // simplification opportunities, and both can propagate functions through
  // function pointers.  When this happens, we often have to resolve varargs
  // calls, etc, so let instcombine do this.
  addInstructionCombiningPass(PM);
  addExtensionsToPM(EP_Peephole, PM);

  // Inline small functions
  bool RunInliner = Inliner;
  if (RunInliner) {
    PM.add(Inliner);
    Inliner = nullptr;
  }

  PM.add(createPruneEHPass());   // Remove dead EH info.

  // Optimize globals again if we ran the inliner.
  if (RunInliner)
    PM.add(createGlobalOptimizerPass());
  PM.add(createGlobalDCEPass()); // Remove dead functions.

  // If we didn't decide to inline a function, check to see if we can
  // transform it to pass arguments by value instead of by reference.
  PM.add(createArgumentPromotionPass());

  // The IPO passes may leave cruft around.  Clean up after them.
  addInstructionCombiningPass(PM);
  addExtensionsToPM(EP_Peephole, PM);
  PM.add(createJumpThreadingPass());

  // Break up allocas
  if (UseNewSROA)
    PM.add(createSROAPass());
  else
    PM.add(createScalarReplAggregatesPass());

  // Run a few AA driven optimizations here and now, to cleanup the code.
  PM.add(createPostOrderFunctionAttrsLegacyPass()); // Add nocapture.
  PM.add(createGlobalsAAWrapperPass()); // IP alias analysis.

  PM.add(createLICMPass());                 // Hoist loop invariants.
  if (EnableMLSM)
    PM.add(createMergedLoadStoreMotionPass()); // Merge ld/st in diamonds.
  PM.add(createGVNPass(DisableGVNLoadPRE)); // Remove redundancies.
  PM.add(createMemCpyOptPass());            // Remove dead memcpys.

  // Nuke dead stores.
  PM.add(createDeadStoreEliminationPass());

  // More loops are countable; try to optimize them.
  PM.add(createIndVarSimplifyPass());
  PM.add(createLoopDeletionPass());
  if (EnableLoopInterchange)
    PM.add(createLoopInterchangePass());

  if (!DisableUnrollLoops)
    PM.add(createSimpleLoopUnrollPass());   // Unroll small loops
  PM.add(createLoopVectorizePass(true, LoopVectorize));
  // The vectorizer may have significantly shortened a loop body; unroll again.
  if (!DisableUnrollLoops)
    PM.add(createLoopUnrollPass());

//.........这里部分代码省略.........

static void registerAppendBogusCode(const PassManagerBuilder &, legacy::PassManagerBase &PM) {
    PM.add(new AppendBogusCode());
}

static void addCoroutineOptimizerLastPasses(const PassManagerBuilder &Builder,
                                            legacy::PassManagerBase &PM) {
  PM.add(createCoroCleanupPass());
}

static void registerCatPass (const PassManagerBuilder &, legacy::PassManagerBase &PM) {
  PM.add(new CatPass());
}

// Automatically enable the pass.
// http://adriansampson.net/blog/clangpass.html
static void registerTraversalPass(const PassManagerBuilder &,
                                  legacy::PassManagerBase &PM)
{
    PM.add(new TraversalPass());
}