C++ ModuleDecl::isStdlibModule方法代码示例

// Returns the callee of an apply_inst if it is basically inlinable.
SILFunction *swift::getEligibleFunction(FullApplySite AI,
                                        InlineSelection WhatToInline) {
  SILFunction *Callee = AI.getReferencedFunction();

  if (!Callee) {
    return nullptr;
  }

  // Not all apply sites can be inlined, even if they're direct.
  if (!SILInliner::canInline(AI))
    return nullptr;

  ModuleDecl *SwiftModule = Callee->getModule().getSwiftModule();
  bool IsInStdlib = (SwiftModule->isStdlibModule() ||
                     SwiftModule->isOnoneSupportModule());

  // Don't inline functions that are marked with the @_semantics or @_effects
  // attribute if the inliner is asked not to inline them.
  if (Callee->hasSemanticsAttrs() || Callee->hasEffectsKind()) {
    if (WhatToInline == InlineSelection::NoSemanticsAndGlobalInit) {
      if (shouldSkipApplyDuringEarlyInlining(AI))
        return nullptr;
      if (Callee->hasSemanticsAttr("inline_late"))
        return nullptr;
    }
    // The "availability" semantics attribute is treated like global-init.
    if (Callee->hasSemanticsAttrs() &&
        WhatToInline != InlineSelection::Everything &&
        (Callee->hasSemanticsAttrThatStartsWith("availability") ||
         (Callee->hasSemanticsAttrThatStartsWith("inline_late")))) {
      return nullptr;
    }
    if (Callee->hasSemanticsAttrs() &&
        WhatToInline == InlineSelection::Everything) {
      if (Callee->hasSemanticsAttrThatStartsWith("inline_late") && IsInStdlib) {
        return nullptr;
      }
    }

  } else if (Callee->isGlobalInit()) {
    if (WhatToInline != InlineSelection::Everything) {
      return nullptr;
    }
  }

  // We can't inline external declarations.
  if (Callee->empty() || Callee->isExternalDeclaration()) {
    return nullptr;
  }

  // Explicitly disabled inlining.
  if (Callee->getInlineStrategy() == NoInline) {
    return nullptr;
  }

  if (!Callee->shouldOptimize()) {
    return nullptr;
  }

  SILFunction *Caller = AI.getFunction();

  // We don't support inlining a function that binds dynamic self because we
  // have no mechanism to preserve the original function's local self metadata.
  if (mayBindDynamicSelf(Callee)) {
    // Check if passed Self is the same as the Self of the caller.
    // In this case, it is safe to inline because both functions
    // use the same Self.
    if (AI.hasSelfArgument() && Caller->hasSelfParam()) {
      auto CalleeSelf = stripCasts(AI.getSelfArgument());
      auto CallerSelf = Caller->getSelfArgument();
      if (CalleeSelf != SILValue(CallerSelf))
        return nullptr;
    } else
      return nullptr;
  }

  // Detect self-recursive calls.
  if (Caller == Callee) {
    return nullptr;
  }

  // A non-fragile function may not be inlined into a fragile function.
  if (Caller->isSerialized() &&
      !Callee->hasValidLinkageForFragileInline()) {
    if (!Callee->hasValidLinkageForFragileRef()) {
      llvm::errs() << "caller: " << Caller->getName() << "\n";
      llvm::errs() << "callee: " << Callee->getName() << "\n";
      llvm_unreachable("Should never be inlining a resilient function into "
                       "a fragile function");
    }
    return nullptr;
  }

  // Inlining self-recursive functions into other functions can result
  // in excessive code duplication since we run the inliner multiple
  // times in our pipeline
  if (calleeIsSelfRecursive(Callee)) {
    return nullptr;
  }
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