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      1 /*
      2  * Copyright (C) 2011 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef ART_COMPILER_JNI_QUICK_X86_CALLING_CONVENTION_X86_H_
     18 #define ART_COMPILER_JNI_QUICK_X86_CALLING_CONVENTION_X86_H_
     19 
     20 #include "base/enums.h"
     21 #include "jni/quick/calling_convention.h"
     22 
     23 namespace art {
     24 namespace x86 {
     25 
     26 constexpr size_t kFramePointerSize = static_cast<size_t>(PointerSize::k32);
     27 
     28 class X86ManagedRuntimeCallingConvention final : public ManagedRuntimeCallingConvention {
     29  public:
     30   X86ManagedRuntimeCallingConvention(bool is_static, bool is_synchronized, const char* shorty)
     31       : ManagedRuntimeCallingConvention(is_static,
     32                                         is_synchronized,
     33                                         shorty,
     34                                         PointerSize::k32),
     35         gpr_arg_count_(0) {}
     36   ~X86ManagedRuntimeCallingConvention() override {}
     37   // Calling convention
     38   ManagedRegister ReturnRegister() override;
     39   ManagedRegister InterproceduralScratchRegister() override;
     40   // Managed runtime calling convention
     41   ManagedRegister MethodRegister() override;
     42   bool IsCurrentParamInRegister() override;
     43   bool IsCurrentParamOnStack() override;
     44   ManagedRegister CurrentParamRegister() override;
     45   FrameOffset CurrentParamStackOffset() override;
     46   const ManagedRegisterEntrySpills& EntrySpills() override;
     47 
     48  private:
     49   int gpr_arg_count_;
     50   ManagedRegister CurrentParamHighLongRegister();
     51   ManagedRegisterEntrySpills entry_spills_;
     52   DISALLOW_COPY_AND_ASSIGN(X86ManagedRuntimeCallingConvention);
     53 };
     54 
     55 // Implements the x86 cdecl calling convention.
     56 class X86JniCallingConvention final : public JniCallingConvention {
     57  public:
     58   X86JniCallingConvention(bool is_static,
     59                           bool is_synchronized,
     60                           bool is_critical_native,
     61                           const char* shorty);
     62   ~X86JniCallingConvention() override {}
     63   // Calling convention
     64   ManagedRegister ReturnRegister() override;
     65   ManagedRegister IntReturnRegister() override;
     66   ManagedRegister InterproceduralScratchRegister() override;
     67   // JNI calling convention
     68   size_t FrameSize() override;
     69   size_t OutArgSize() override;
     70   ArrayRef<const ManagedRegister> CalleeSaveRegisters() const override;
     71   ManagedRegister ReturnScratchRegister() const override;
     72   uint32_t CoreSpillMask() const override;
     73   uint32_t FpSpillMask() const override;
     74   bool IsCurrentParamInRegister() override;
     75   bool IsCurrentParamOnStack() override;
     76   ManagedRegister CurrentParamRegister() override;
     77   FrameOffset CurrentParamStackOffset() override;
     78 
     79   // x86 needs to extend small return types.
     80   bool RequiresSmallResultTypeExtension() const override {
     81     return true;
     82   }
     83 
     84  protected:
     85   size_t NumberOfOutgoingStackArgs() override;
     86 
     87  private:
     88   DISALLOW_COPY_AND_ASSIGN(X86JniCallingConvention);
     89 };
     90 
     91 }  // namespace x86
     92 }  // namespace art
     93 
     94 #endif  // ART_COMPILER_JNI_QUICK_X86_CALLING_CONVENTION_X86_H_
     95