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@@ -21,194 +21,195 @@
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#include "llvm/ADT/StringRef.h"
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namespace llvm {
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- class Constant;
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- class GlobalValue;
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- class Type;
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- class Value;
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+class Constant;
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+class GlobalValue;
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+class Type;
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+class Value;
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}
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namespace clang {
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- class ABIInfo;
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- class Decl;
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-
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- namespace CodeGen {
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- class CallArgList;
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- class CodeGenModule;
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- class CodeGenFunction;
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- class CGFunctionInfo;
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+class ABIInfo;
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+class Decl;
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+
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+namespace CodeGen {
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+class CallArgList;
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+class CodeGenModule;
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+class CodeGenFunction;
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+class CGFunctionInfo;
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+}
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+
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+/// TargetCodeGenInfo - This class organizes various target-specific
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+/// codegeneration issues, like target-specific attributes, builtins and so
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+/// on.
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+class TargetCodeGenInfo {
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+ ABIInfo *Info;
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+
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+public:
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+ // WARNING: Acquires the ownership of ABIInfo.
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+ TargetCodeGenInfo(ABIInfo *info = 0) : Info(info) {}
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+ virtual ~TargetCodeGenInfo();
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+
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+ /// getABIInfo() - Returns ABI info helper for the target.
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+ const ABIInfo &getABIInfo() const { return *Info; }
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+
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+ /// SetTargetAttributes - Provides a convenient hook to handle extra
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+ /// target-specific attributes for the given global.
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+ virtual void SetTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
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+ CodeGen::CodeGenModule &M) const {}
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+
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+ /// EmitTargetMD - Provides a convenient hook to handle extra
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+ /// target-specific metadata for the given global.
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+ virtual void emitTargetMD(const Decl *D, llvm::GlobalValue *GV,
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+ CodeGen::CodeGenModule &M) const {}
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+
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+ /// Determines the size of struct _Unwind_Exception on this platform,
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+ /// in 8-bit units. The Itanium ABI defines this as:
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+ /// struct _Unwind_Exception {
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+ /// uint64 exception_class;
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+ /// _Unwind_Exception_Cleanup_Fn exception_cleanup;
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+ /// uint64 private_1;
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+ /// uint64 private_2;
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+ /// };
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+ virtual unsigned getSizeOfUnwindException() const;
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+
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+ /// Controls whether __builtin_extend_pointer should sign-extend
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+ /// pointers to uint64_t or zero-extend them (the default). Has
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+ /// no effect for targets:
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+ /// - that have 64-bit pointers, or
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+ /// - that cannot address through registers larger than pointers, or
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+ /// - that implicitly ignore/truncate the top bits when addressing
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+ /// through such registers.
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+ virtual bool extendPointerWithSExt() const { return false; }
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+
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+ /// Determines the DWARF register number for the stack pointer, for
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+ /// exception-handling purposes. Implements __builtin_dwarf_sp_column.
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+ ///
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+ /// Returns -1 if the operation is unsupported by this target.
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+ virtual int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const {
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+ return -1;
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+ }
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+
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+ /// Initializes the given DWARF EH register-size table, a char*.
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+ /// Implements __builtin_init_dwarf_reg_size_table.
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+ ///
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+ /// Returns true if the operation is unsupported by this target.
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+ virtual bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF,
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+ llvm::Value *Address) const {
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+ return true;
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+ }
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+
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+ /// Performs the code-generation required to convert a return
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+ /// address as stored by the system into the actual address of the
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+ /// next instruction that will be executed.
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+ ///
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+ /// Used by __builtin_extract_return_addr().
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+ virtual llvm::Value *decodeReturnAddress(CodeGen::CodeGenFunction &CGF,
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+ llvm::Value *Address) const {
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+ return Address;
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+ }
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+
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+ /// Performs the code-generation required to convert the address
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+ /// of an instruction into a return address suitable for storage
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+ /// by the system in a return slot.
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+ ///
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+ /// Used by __builtin_frob_return_addr().
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+ virtual llvm::Value *encodeReturnAddress(CodeGen::CodeGenFunction &CGF,
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+ llvm::Value *Address) const {
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+ return Address;
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+ }
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+
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+ /// Corrects the low-level LLVM type for a given constraint and "usual"
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+ /// type.
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+ ///
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+ /// \returns A pointer to a new LLVM type, possibly the same as the original
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+ /// on success; 0 on failure.
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+ virtual llvm::Type *adjustInlineAsmType(CodeGen::CodeGenFunction &CGF,
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+ StringRef Constraint,
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+ llvm::Type *Ty) const {
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+ return Ty;
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+ }
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+
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+ /// doesReturnSlotInterfereWithArgs - Return true if the target uses an
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+ /// argument slot for an 'sret' type.
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+ virtual bool doesReturnSlotInterfereWithArgs() const { return true; }
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+
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+ /// Retrieve the address of a function to call immediately before
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+ /// calling objc_retainAutoreleasedReturnValue. The
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+ /// implementation of objc_autoreleaseReturnValue sniffs the
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+ /// instruction stream following its return address to decide
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+ /// whether it's a call to objc_retainAutoreleasedReturnValue.
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+ /// This can be prohibitively expensive, depending on the
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+ /// relocation model, and so on some targets it instead sniffs for
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+ /// a particular instruction sequence. This functions returns
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+ /// that instruction sequence in inline assembly, which will be
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+ /// empty if none is required.
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+ virtual StringRef getARCRetainAutoreleasedReturnValueMarker() const {
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+ return "";
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+ }
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+
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+ /// Return a constant used by UBSan as a signature to identify functions
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+ /// possessing type information, or 0 if the platform is unsupported.
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+ virtual llvm::Constant *
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+ getUBSanFunctionSignature(CodeGen::CodeGenModule &CGM) const {
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+ return 0;
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}
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- /// TargetCodeGenInfo - This class organizes various target-specific
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- /// codegeneration issues, like target-specific attributes, builtins and so
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- /// on.
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- class TargetCodeGenInfo {
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- ABIInfo *Info;
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- public:
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- // WARNING: Acquires the ownership of ABIInfo.
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- TargetCodeGenInfo(ABIInfo *info = 0):Info(info) { }
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- virtual ~TargetCodeGenInfo();
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-
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- /// getABIInfo() - Returns ABI info helper for the target.
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- const ABIInfo& getABIInfo() const { return *Info; }
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-
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- /// SetTargetAttributes - Provides a convenient hook to handle extra
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- /// target-specific attributes for the given global.
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- virtual void SetTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
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- CodeGen::CodeGenModule &M) const { }
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-
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- /// EmitTargetMD - Provides a convenient hook to handle extra
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- /// target-specific metadata for the given global.
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- virtual void emitTargetMD(const Decl *D, llvm::GlobalValue *GV,
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- CodeGen::CodeGenModule &M) const { }
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-
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- /// Determines the size of struct _Unwind_Exception on this platform,
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- /// in 8-bit units. The Itanium ABI defines this as:
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- /// struct _Unwind_Exception {
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- /// uint64 exception_class;
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- /// _Unwind_Exception_Cleanup_Fn exception_cleanup;
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- /// uint64 private_1;
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- /// uint64 private_2;
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- /// };
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- virtual unsigned getSizeOfUnwindException() const;
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-
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- /// Controls whether __builtin_extend_pointer should sign-extend
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- /// pointers to uint64_t or zero-extend them (the default). Has
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- /// no effect for targets:
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- /// - that have 64-bit pointers, or
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- /// - that cannot address through registers larger than pointers, or
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- /// - that implicitly ignore/truncate the top bits when addressing
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- /// through such registers.
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- virtual bool extendPointerWithSExt() const { return false; }
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-
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- /// Determines the DWARF register number for the stack pointer, for
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- /// exception-handling purposes. Implements __builtin_dwarf_sp_column.
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- ///
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- /// Returns -1 if the operation is unsupported by this target.
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- virtual int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const {
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- return -1;
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- }
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-
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- /// Initializes the given DWARF EH register-size table, a char*.
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- /// Implements __builtin_init_dwarf_reg_size_table.
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- ///
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- /// Returns true if the operation is unsupported by this target.
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- virtual bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF,
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- llvm::Value *Address) const {
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- return true;
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- }
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-
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- /// Performs the code-generation required to convert a return
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- /// address as stored by the system into the actual address of the
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- /// next instruction that will be executed.
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- ///
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- /// Used by __builtin_extract_return_addr().
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- virtual llvm::Value *decodeReturnAddress(CodeGen::CodeGenFunction &CGF,
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- llvm::Value *Address) const {
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- return Address;
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- }
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-
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- /// Performs the code-generation required to convert the address
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- /// of an instruction into a return address suitable for storage
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- /// by the system in a return slot.
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- ///
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- /// Used by __builtin_frob_return_addr().
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- virtual llvm::Value *encodeReturnAddress(CodeGen::CodeGenFunction &CGF,
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- llvm::Value *Address) const {
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- return Address;
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- }
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-
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- /// Corrects the low-level LLVM type for a given constraint and "usual"
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- /// type.
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- ///
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- /// \returns A pointer to a new LLVM type, possibly the same as the original
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- /// on success; 0 on failure.
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- virtual llvm::Type* adjustInlineAsmType(CodeGen::CodeGenFunction &CGF,
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- StringRef Constraint,
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- llvm::Type* Ty) const {
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- return Ty;
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- }
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-
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- /// doesReturnSlotInterfereWithArgs - Return true if the target uses an
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- /// argument slot for an 'sret' type.
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- virtual bool doesReturnSlotInterfereWithArgs() const { return true; }
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-
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- /// Retrieve the address of a function to call immediately before
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- /// calling objc_retainAutoreleasedReturnValue. The
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- /// implementation of objc_autoreleaseReturnValue sniffs the
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- /// instruction stream following its return address to decide
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- /// whether it's a call to objc_retainAutoreleasedReturnValue.
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- /// This can be prohibitively expensive, depending on the
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- /// relocation model, and so on some targets it instead sniffs for
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- /// a particular instruction sequence. This functions returns
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- /// that instruction sequence in inline assembly, which will be
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- /// empty if none is required.
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- virtual StringRef getARCRetainAutoreleasedReturnValueMarker() const {
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- return "";
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- }
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-
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- /// Return a constant used by UBSan as a signature to identify functions
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- /// possessing type information, or 0 if the platform is unsupported.
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- virtual llvm::Constant *getUBSanFunctionSignature(
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- CodeGen::CodeGenModule &CGM) const {
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- return 0;
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- }
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-
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- /// Determine whether a call to an unprototyped functions under
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- /// the given calling convention should use the variadic
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- /// convention or the non-variadic convention.
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- ///
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- /// There's a good reason to make a platform's variadic calling
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- /// convention be different from its non-variadic calling
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- /// convention: the non-variadic arguments can be passed in
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- /// registers (better for performance), and the variadic arguments
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- /// can be passed on the stack (also better for performance). If
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- /// this is done, however, unprototyped functions *must* use the
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- /// non-variadic convention, because C99 states that a call
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- /// through an unprototyped function type must succeed if the
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- /// function was defined with a non-variadic prototype with
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- /// compatible parameters. Therefore, splitting the conventions
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- /// makes it impossible to call a variadic function through an
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- /// unprototyped type. Since function prototypes came out in the
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- /// late 1970s, this is probably an acceptable trade-off.
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- /// Nonetheless, not all platforms are willing to make it, and in
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- /// particularly x86-64 bends over backwards to make the
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- /// conventions compatible.
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- ///
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- /// The default is false. This is correct whenever:
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- /// - the conventions are exactly the same, because it does not
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- /// matter and the resulting IR will be somewhat prettier in
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- /// certain cases; or
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- /// - the conventions are substantively different in how they pass
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- /// arguments, because in this case using the variadic convention
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- /// will lead to C99 violations.
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- ///
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- /// However, some platforms make the conventions identical except
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- /// for passing additional out-of-band information to a variadic
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- /// function: for example, x86-64 passes the number of SSE
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- /// arguments in %al. On these platforms, it is desirable to
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- /// call unprototyped functions using the variadic convention so
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- /// that unprototyped calls to varargs functions still succeed.
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- ///
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- /// Relatedly, platforms which pass the fixed arguments to this:
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- /// A foo(B, C, D);
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- /// differently than they would pass them to this:
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- /// A foo(B, C, D, ...);
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- /// may need to adjust the debugger-support code in Sema to do the
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- /// right thing when calling a function with no know signature.
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- virtual bool isNoProtoCallVariadic(const CodeGen::CallArgList &args,
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- const FunctionNoProtoType *fnType) const;
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-
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- /// Gets the linker options necessary to link a dependent library on this
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- /// platform.
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- virtual void getDependentLibraryOption(llvm::StringRef Lib,
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- llvm::SmallString<24> &Opt) const;
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-
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- /// Gets the linker options necessary to detect object file mismatches on
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- /// this platform.
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- virtual void getDetectMismatchOption(llvm::StringRef Name,
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- llvm::StringRef Value,
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- llvm::SmallString<32> &Opt) const {}
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- };
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+ /// Determine whether a call to an unprototyped functions under
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+ /// the given calling convention should use the variadic
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+ /// convention or the non-variadic convention.
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+ ///
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+ /// There's a good reason to make a platform's variadic calling
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+ /// convention be different from its non-variadic calling
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+ /// convention: the non-variadic arguments can be passed in
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+ /// registers (better for performance), and the variadic arguments
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+ /// can be passed on the stack (also better for performance). If
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+ /// this is done, however, unprototyped functions *must* use the
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+ /// non-variadic convention, because C99 states that a call
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+ /// through an unprototyped function type must succeed if the
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+ /// function was defined with a non-variadic prototype with
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+ /// compatible parameters. Therefore, splitting the conventions
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+ /// makes it impossible to call a variadic function through an
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+ /// unprototyped type. Since function prototypes came out in the
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+ /// late 1970s, this is probably an acceptable trade-off.
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+ /// Nonetheless, not all platforms are willing to make it, and in
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+ /// particularly x86-64 bends over backwards to make the
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+ /// conventions compatible.
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+ ///
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+ /// The default is false. This is correct whenever:
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+ /// - the conventions are exactly the same, because it does not
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+ /// matter and the resulting IR will be somewhat prettier in
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+ /// certain cases; or
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+ /// - the conventions are substantively different in how they pass
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+ /// arguments, because in this case using the variadic convention
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+ /// will lead to C99 violations.
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+ ///
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+ /// However, some platforms make the conventions identical except
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+ /// for passing additional out-of-band information to a variadic
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+ /// function: for example, x86-64 passes the number of SSE
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+ /// arguments in %al. On these platforms, it is desirable to
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+ /// call unprototyped functions using the variadic convention so
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+ /// that unprototyped calls to varargs functions still succeed.
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+ ///
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+ /// Relatedly, platforms which pass the fixed arguments to this:
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+ /// A foo(B, C, D);
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+ /// differently than they would pass them to this:
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+ /// A foo(B, C, D, ...);
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+ /// may need to adjust the debugger-support code in Sema to do the
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+ /// right thing when calling a function with no know signature.
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+ virtual bool isNoProtoCallVariadic(const CodeGen::CallArgList &args,
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+ const FunctionNoProtoType *fnType) const;
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+
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+ /// Gets the linker options necessary to link a dependent library on this
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+ /// platform.
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+ virtual void getDependentLibraryOption(llvm::StringRef Lib,
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+ llvm::SmallString<24> &Opt) const;
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+
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+ /// Gets the linker options necessary to detect object file mismatches on
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+ /// this platform.
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+ virtual void getDetectMismatchOption(llvm::StringRef Name,
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+ llvm::StringRef Value,
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+ llvm::SmallString<32> &Opt) const {}
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+};
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}
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#endif // CLANG_CODEGEN_TARGETINFO_H
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Rafael Espindola