//===--- CodeGenTypeCache.h - Commonly used LLVM types and info -*- C++ -*-===//

//

// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

// See https://llvm.org/LICENSE.txt for license information.

// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

//

//===----------------------------------------------------------------------===//

//

// This structure provides a set of common types useful during IR emission.

//

//===----------------------------------------------------------------------===//

#ifndef LLVM_CLANG_LIB_CODEGEN_CODEGENTYPECACHE_H

#define LLVM_CLANG_LIB_CODEGEN_CODEGENTYPECACHE_H

#include "clang/AST/CharUnits.h"

#include "clang/Basic/AddressSpaces.h"

#include "llvm/IR/CallingConv.h"

namespace llvm {

  class Type;

  class IntegerType;

  class PointerType;

}

namespace clang {

namespace CodeGen {

/// This structure provides a set of types that are commonly used

/// during IR emission.  It's initialized once in CodeGenModule's

/// constructor and then copied around into new CodeGenFunctions.

struct CodeGenTypeCache {

  /// void

  llvm::Type *VoidTy;

  /// i8, i16, i32, and i64

  llvm::IntegerType *Int8Ty, *Int16Ty, *Int32Ty, *Int64Ty;

  /// float, double

  llvm::Type *HalfTy, *FloatTy, *DoubleTy;

  /// int

  llvm::IntegerType *IntTy;

  /// intptr_t, size_t, and ptrdiff_t, which we assume are the same size.

  union {

    llvm::IntegerType *IntPtrTy;

    llvm::IntegerType *SizeTy;

    llvm::IntegerType *PtrDiffTy;

  };

  /// void* in address space 0

  union {

    llvm::PointerType *VoidPtrTy;

    llvm::PointerType *Int8PtrTy;

  };

  /// void** in address space 0

  union {

    llvm::PointerType *VoidPtrPtrTy;

    llvm::PointerType *Int8PtrPtrTy;

  };

  /// void* in alloca address space

  union {

    llvm::PointerType *AllocaVoidPtrTy;

    llvm::PointerType *AllocaInt8PtrTy;

  };

  /// The size and alignment of the builtin C type 'int'.  This comes

  /// up enough in various ABI lowering tasks to be worth pre-computing.

  union {

    unsigned char IntSizeInBytes;

    unsigned char IntAlignInBytes;

  };

  CharUnits getIntSize() const {

    return CharUnits::fromQuantity(IntSizeInBytes);

  }

  CharUnits getIntAlign() const {

    return CharUnits::fromQuantity(IntAlignInBytes);

  }

  /// The width of a pointer into the generic address space.

  unsigned char PointerWidthInBits;

  /// The size and alignment of a pointer into the generic address space.

  union {

    unsigned char PointerAlignInBytes;

    unsigned char PointerSizeInBytes;

  };

  /// The size and alignment of size_t.

  union {

    unsigned char SizeSizeInBytes; // sizeof(size_t)

    unsigned char SizeAlignInBytes;

  };

  LangAS ASTAllocaAddressSpace;

  CharUnits getSizeSize() const {

    return CharUnits::fromQuantity(SizeSizeInBytes);

  }

  CharUnits getSizeAlign() const {

    return CharUnits::fromQuantity(SizeAlignInBytes);

  }

  CharUnits getPointerSize() const {

    return CharUnits::fromQuantity(PointerSizeInBytes);

  }

  CharUnits getPointerAlign() const {

    return CharUnits::fromQuantity(PointerAlignInBytes);

  }

  llvm::CallingConv::ID RuntimeCC;

  llvm::CallingConv::ID getRuntimeCC() const { return RuntimeCC; }

  LangAS getASTAllocaAddressSpace() const { return ASTAllocaAddressSpace; }

};

}  // end namespace CodeGen

}  // end namespace clang

#endif