void VisitArguments()

in runtime/entrypoints/quick/quick_trampoline_entrypoints.cc [438:561]
113 lines of code
42 McCabe index (conditional complexity)

  void VisitArguments() SHARED_REQUIRES(Locks::mutator_lock_) {
    // (a) 'stack_args_' should point to the first method's argument
    // (b) whatever the argument type it is, the 'stack_index_' should
    //     be moved forward along with every visiting.
    gpr_index_ = 0;
    fpr_index_ = 0;
    if (kQuickDoubleRegAlignedFloatBackFilled) {
      fpr_double_index_ = 0;
    }
    stack_index_ = 0;
    if (!is_static_) {  // Handle this.
      cur_type_ = Primitive::kPrimNot;
      is_split_long_or_double_ = false;
      Visit();
      stack_index_++;
      if (kNumQuickGprArgs > 0) {
        IncGprIndex();
      }
    }
    for (uint32_t shorty_index = 1; shorty_index < shorty_len_; ++shorty_index) {
      cur_type_ = Primitive::GetType(shorty_[shorty_index]);
      switch (cur_type_) {
        case Primitive::kPrimNot:
        case Primitive::kPrimBoolean:
        case Primitive::kPrimByte:
        case Primitive::kPrimChar:
        case Primitive::kPrimShort:
        case Primitive::kPrimInt:
          is_split_long_or_double_ = false;
          Visit();
          stack_index_++;
          if (gpr_index_ < kNumQuickGprArgs) {
            IncGprIndex();
          }
          break;
        case Primitive::kPrimFloat:
          is_split_long_or_double_ = false;
          Visit();
          stack_index_++;
          if (kQuickSoftFloatAbi) {
            if (gpr_index_ < kNumQuickGprArgs) {
              IncGprIndex();
            }
          } else {
            if (fpr_index_ + 1 < kNumQuickFprArgs + 1) {
              IncFprIndex();
              if (kQuickDoubleRegAlignedFloatBackFilled) {
                // Double should not overlap with float.
                // For example, if fpr_index_ = 3, fpr_double_index_ should be at least 4.
                fpr_double_index_ = std::max(fpr_double_index_, RoundUp(fpr_index_, 2));
                // Float should not overlap with double.
                if (fpr_index_ % 2 == 0) {
                  fpr_index_ = std::max(fpr_double_index_, fpr_index_);
                }
              } else if (kQuickSkipOddFpRegisters) {
                IncFprIndex();
              }
            }
          }
          break;
        case Primitive::kPrimDouble:
        case Primitive::kPrimLong:
          if (kQuickSoftFloatAbi || (cur_type_ == Primitive::kPrimLong)) {
            if (cur_type_ == Primitive::kPrimLong && kAlignPairRegister && gpr_index_ == 0) {
              // Currently, this is only for ARM and MIPS, where the first available parameter
              // register is R1 (on ARM) or A1 (on MIPS). So we skip it, and use R2 (on ARM) or
              // A2 (on MIPS) instead.
              IncGprIndex();
            }
            is_split_long_or_double_ = (GetBytesPerGprSpillLocation(kRuntimeISA) == 4) &&
                ((gpr_index_ + 1) == kNumQuickGprArgs);
            if (!kSplitPairAcrossRegisterAndStack && is_split_long_or_double_) {
              // We don't want to split this. Pass over this register.
              gpr_index_++;
              is_split_long_or_double_ = false;
            }
            Visit();
            if (kBytesStackArgLocation == 4) {
              stack_index_+= 2;
            } else {
              CHECK_EQ(kBytesStackArgLocation, 8U);
              stack_index_++;
            }
            if (gpr_index_ < kNumQuickGprArgs) {
              IncGprIndex();
              if (GetBytesPerGprSpillLocation(kRuntimeISA) == 4) {
                if (gpr_index_ < kNumQuickGprArgs) {
                  IncGprIndex();
                }
              }
            }
          } else {
            is_split_long_or_double_ = (GetBytesPerFprSpillLocation(kRuntimeISA) == 4) &&
                ((fpr_index_ + 1) == kNumQuickFprArgs) && !kQuickDoubleRegAlignedFloatBackFilled;
            Visit();
            if (kBytesStackArgLocation == 4) {
              stack_index_+= 2;
            } else {
              CHECK_EQ(kBytesStackArgLocation, 8U);
              stack_index_++;
            }
            if (kQuickDoubleRegAlignedFloatBackFilled) {
              if (fpr_double_index_ + 2 < kNumQuickFprArgs + 1) {
                fpr_double_index_ += 2;
                // Float should not overlap with double.
                if (fpr_index_ % 2 == 0) {
                  fpr_index_ = std::max(fpr_double_index_, fpr_index_);
                }
              }
            } else if (fpr_index_ + 1 < kNumQuickFprArgs + 1) {
              IncFprIndex();
              if (GetBytesPerFprSpillLocation(kRuntimeISA) == 4) {
                if (fpr_index_ + 1 < kNumQuickFprArgs + 1) {
                  IncFprIndex();
                }
              }
            }
          }
          break;
        default:
          LOG(FATAL) << "Unexpected type: " << cur_type_ << " in " << shorty_;
      }
    }
  }