Merge branch 'master' of ssh://bitbucket.org/czan/honours

1 files changed, 170 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/TargetInfo.h b/clang/lib/CodeGen/TargetInfo.h
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+//===---- 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 "clang/Basic/LLVM.h"
+#include "clang/AST/Type.h"
+#include "llvm/ADT/StringRef.h"
+
+namespace llvm {
+  class GlobalValue;
+  class Type;
+  class Value;
+}
+
+namespace clang {
+  class ABIInfo;
+  class Decl;
+
+  namespace CodeGen {
+    class CallArgList;
+    class CodeGenModule;
+    class CodeGenFunction;
+    class CGFunctionInfo;
+  }
+
+  /// 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;
+    ///   };
+    virtual unsigned getSizeOfUnwindException() const;
+
+    /// 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 llvm::Type* adjustInlineAsmType(CodeGen::CodeGenFunction &CGF,
+                                            StringRef Constraint, 
+                                            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 StringRef getARCRetainAutoreleasedReturnValueMarker() const {
+      return "";
+    }
+
+    /// Determine whether a call to an unprototyped functions under
+    /// the given calling convention should use the variadic
+    /// convention or the non-variadic convention.
+    ///
+    /// There's a good reason to make a platform's variadic calling
+    /// convention be different from its non-variadic calling
+    /// convention: the non-variadic arguments can be passed in
+    /// registers (better for performance), and the variadic arguments
+    /// can be passed on the stack (also better for performance).  If
+    /// this is done, however, unprototyped functions *must* use the
+    /// non-variadic convention, because C99 states that a call
+    /// through an unprototyped function type must succeed if the
+    /// function was defined with a non-variadic prototype with
+    /// compatible parameters.  Therefore, splitting the conventions
+    /// makes it impossible to call a variadic function through an
+    /// unprototyped type.  Since function prototypes came out in the
+    /// late 1970s, this is probably an acceptable trade-off.
+    /// Nonetheless, not all platforms are willing to make it, and in
+    /// particularly x86-64 bends over backwards to make the
+    /// conventions compatible.
+    ///
+    /// The default is false.  This is correct whenever:
+    ///   - the conventions are exactly the same, because it does not
+    ///     matter and the resulting IR will be somewhat prettier in
+    ///     certain cases; or
+    ///   - the conventions are substantively different in how they pass
+    ///     arguments, because in this case using the variadic convention
+    ///     will lead to C99 violations.
+    /// It is not necessarily correct when arguments are passed in the
+    /// same way and some out-of-band information is passed for the
+    /// benefit of variadic callees, as is the case for x86-64.
+    /// In this case the ABI should be consulted.
+    virtual bool isNoProtoCallVariadic(const CodeGen::CallArgList &args,
+                                       const FunctionNoProtoType *fnType) const;
+  };
+}
+
+#endif // CLANG_CODEGEN_TARGETINFO_H