| //===---- 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; |
| } |
| |
| /// Retrieve the address of a function to call immediately before |
| /// calling objc_retainAutoreleasedReturnValue. The |
| /// implementation of objc_autoreleaseReturnValue sniffs the |
| /// instruction stream following its return address to decide |
| /// whether it's a call to objc_retainAutoreleasedReturnValue. |
| /// This can be prohibitively expensive, depending on the |
| /// relocation model, and so on some targets it instead sniffs for |
| /// a particular instruction sequence. This functions returns |
| /// that instruction sequence in inline assembly, which will be |
| /// empty if none is required. |
| virtual llvm::StringRef getARCRetainAutoreleasedReturnValueMarker() const { |
| return ""; |
| } |
| }; |
| } |
| |
| #endif // CLANG_CODEGEN_TARGETINFO_H |