Method compileReturnIndirectCallOp

lib/llvm/compiler.cpp:4399–4472

  }

  void compileReturnIndirectCallOp(const uint32_t TableIndex,
                                   const uint32_t FuncTypeIndex) noexcept {
    auto NotNullBB = LLVM::BasicBlock::create(LLContext, F.Fn, "c_i.not_null");
    auto IsNullBB = LLVM::BasicBlock::create(LLContext, F.Fn, "c_i.is_null");

    LLVM::Value FuncIndex = stackPop();
    const auto &FuncType = Context.CompositeTypes[FuncTypeIndex]->getFuncType();
    auto FTy = toLLVMType(Context.LLContext, Context.ExecCtxPtrTy, FuncType);
    auto RTy = FTy.getReturnType();

    const size_t ArgSize = FuncType.getParamTypes().size();
    const size_t RetSize =
        RTy.isVoidTy() ? 0 : FuncType.getReturnTypes().size();
    std::vector<LLVM::Value> ArgsVec(ArgSize + 1, nullptr);
    ArgsVec[0] = F.Fn.getFirstParam();
    for (size_t I = 0; I < ArgSize; ++I) {
      const size_t J = ArgSize - I;
      ArgsVec[J] = stackPop();
    }

    {
      auto FPtr = Builder.createCall(
          Context.getIntrinsic(
              Builder, Executable::Intrinsics::kTableGetFuncSymbol,
              LLVM::Type::getFunctionType(
                  FTy.getPointerTo(),
                  {Context.Int32Ty, Context.Int32Ty, Context.Int32Ty}, false)),
          {LLContext.getInt32(TableIndex), LLContext.getInt32(FuncTypeIndex),
           FuncIndex});
      Builder.createCondBr(
          Builder.createLikely(Builder.createNot(Builder.createIsNull(FPtr))),
          NotNullBB, IsNullBB);
      Builder.positionAtEnd(NotNullBB);

      auto FPtrRet =
          Builder.createCall(LLVM::FunctionCallee(FTy, FPtr), ArgsVec);
      if (RetSize == 0) {
        Builder.createRetVoid();
      } else {
        Builder.createRet(FPtrRet);
      }
    }

    Builder.positionAtEnd(IsNullBB);

    {
      LLVM::Value Args = Builder.createArray(ArgSize, kValSize);
      LLVM::Value Rets = Builder.createArray(RetSize, kValSize);
      Builder.createArrayPtrStore(
          Span<LLVM::Value>(ArgsVec.begin() + 1, ArgSize), Args, Context.Int8Ty,
          kValSize);

      Builder.createCall(
          Context.getIntrinsic(
              Builder, Executable::Intrinsics::kCallIndirect,
              LLVM::Type::getFunctionType(Context.VoidTy,
                                          {Context.Int32Ty, Context.Int32Ty,
                                           Context.Int32Ty, Context.Int8PtrTy,