forked from OSchip/llvm-project
118 lines
4.2 KiB
C++
118 lines
4.2 KiB
C++
//===---- TargetInfo.h - Encapsulate target details -------------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// These classes wrap the information about a call or function
|
|
// definition used to handle ABI compliancy.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef CLANG_CODEGEN_TARGETINFO_H
|
|
#define CLANG_CODEGEN_TARGETINFO_H
|
|
|
|
#include "llvm/ADT/StringRef.h"
|
|
|
|
namespace llvm {
|
|
class GlobalValue;
|
|
class Type;
|
|
class Value;
|
|
}
|
|
|
|
namespace clang {
|
|
class ABIInfo;
|
|
class Decl;
|
|
|
|
namespace CodeGen {
|
|
class CodeGenModule;
|
|
class CodeGenFunction;
|
|
}
|
|
|
|
/// TargetCodeGenInfo - This class organizes various target-specific
|
|
/// codegeneration issues, like target-specific attributes, builtins and so
|
|
/// on.
|
|
class TargetCodeGenInfo {
|
|
ABIInfo *Info;
|
|
public:
|
|
// WARNING: Acquires the ownership of ABIInfo.
|
|
TargetCodeGenInfo(ABIInfo *info = 0):Info(info) { }
|
|
virtual ~TargetCodeGenInfo();
|
|
|
|
/// getABIInfo() - Returns ABI info helper for the target.
|
|
const ABIInfo& getABIInfo() const { return *Info; }
|
|
|
|
/// SetTargetAttributes - Provides a convenient hook to handle extra
|
|
/// target-specific attributes for the given global.
|
|
virtual void SetTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
|
|
CodeGen::CodeGenModule &M) const { }
|
|
|
|
/// Determines the size of struct _Unwind_Exception on this platform,
|
|
/// in 8-bit units. The Itanium ABI defines this as:
|
|
/// struct _Unwind_Exception {
|
|
/// uint64 exception_class;
|
|
/// _Unwind_Exception_Cleanup_Fn exception_cleanup;
|
|
/// uint64 private_1;
|
|
/// uint64 private_2;
|
|
/// };
|
|
unsigned getSizeOfUnwindException() const { return 32; }
|
|
|
|
/// Controls whether __builtin_extend_pointer should sign-extend
|
|
/// pointers to uint64_t or zero-extend them (the default). Has
|
|
/// no effect for targets:
|
|
/// - that have 64-bit pointers, or
|
|
/// - that cannot address through registers larger than pointers, or
|
|
/// - that implicitly ignore/truncate the top bits when addressing
|
|
/// through such registers.
|
|
virtual bool extendPointerWithSExt() const { return false; }
|
|
|
|
/// Determines the DWARF register number for the stack pointer, for
|
|
/// exception-handling purposes. Implements __builtin_dwarf_sp_column.
|
|
///
|
|
/// Returns -1 if the operation is unsupported by this target.
|
|
virtual int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const {
|
|
return -1;
|
|
}
|
|
|
|
/// Initializes the given DWARF EH register-size table, a char*.
|
|
/// Implements __builtin_init_dwarf_reg_size_table.
|
|
///
|
|
/// Returns true if the operation is unsupported by this target.
|
|
virtual bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF,
|
|
llvm::Value *Address) const {
|
|
return true;
|
|
}
|
|
|
|
/// Performs the code-generation required to convert a return
|
|
/// address as stored by the system into the actual address of the
|
|
/// next instruction that will be executed.
|
|
///
|
|
/// Used by __builtin_extract_return_addr().
|
|
virtual llvm::Value *decodeReturnAddress(CodeGen::CodeGenFunction &CGF,
|
|
llvm::Value *Address) const {
|
|
return Address;
|
|
}
|
|
|
|
/// Performs the code-generation required to convert the address
|
|
/// of an instruction into a return address suitable for storage
|
|
/// by the system in a return slot.
|
|
///
|
|
/// Used by __builtin_frob_return_addr().
|
|
virtual llvm::Value *encodeReturnAddress(CodeGen::CodeGenFunction &CGF,
|
|
llvm::Value *Address) const {
|
|
return Address;
|
|
}
|
|
|
|
virtual const llvm::Type* adjustInlineAsmType(CodeGen::CodeGenFunction &CGF,
|
|
llvm::StringRef Constraint,
|
|
const llvm::Type* Ty) const {
|
|
return Ty;
|
|
}
|
|
};
|
|
}
|
|
|
|
#endif // CLANG_CODEGEN_TARGETINFO_H
|