vendor/llvm/llvm-release_360-r226102

1 files changed, 52 insertions, 32 deletions

diff --git a/include/llvm/MC/MCAsmInfo.h b/include/llvm/MC/MCAsmInfo.h
index 06e473d6b625..a750a0fd5cef 100644
--- a/include/llvm/MC/MCAsmInfo.h
+++ b/include/llvm/MC/MCAsmInfo.h
@@ -31,22 +31,23 @@ class MCContext;
 
 namespace WinEH {
 enum class EncodingType {
-  ET_Invalid, /// Invalid
-  ET_Alpha,   /// Windows Alpha
-  ET_Alpha64, /// Windows AXP64
-  ET_ARM,     /// Windows NT (Windows on ARM)
-  ET_CE,      /// Windows CE ARM, PowerPC, SH3, SH4
-  ET_Itanium, /// Windows x64, Windows Itanium (IA-64)
-  ET_MIPS = ET_Alpha,
+  Invalid, /// Invalid
+  Alpha,   /// Windows Alpha
+  Alpha64, /// Windows AXP64
+  ARM,     /// Windows NT (Windows on ARM)
+  CE,      /// Windows CE ARM, PowerPC, SH3, SH4
+  Itanium, /// Windows x64, Windows Itanium (IA-64)
+  MIPS = Alpha,
 };
 }
 
 enum class ExceptionHandling {
-  None,     /// No exception support
-  DwarfCFI, /// DWARF-like instruction based exceptions
-  SjLj,     /// setjmp/longjmp based exceptions
-  ARM,      /// ARM EHABI
-  WinEH,    /// Windows Exception Handling
+  None,         /// No exception support
+  DwarfCFI,     /// DWARF-like instruction based exceptions
+  SjLj,         /// setjmp/longjmp based exceptions
+  ARM,          /// ARM EHABI
+  ItaniumWinEH, /// Itanium EH built on Windows unwind info (.pdata and .xdata)
+  MSVC,         /// MSVC compatible exception handling
 };
 
 namespace LCOMM {
@@ -87,16 +88,11 @@ protected:
   bool HasMachoTBSSDirective;
 
   /// True if the compiler should emit a ".reference .constructors_used" or
-  /// ".reference .destructors_used" directive after the a static ctor/dtor
+  /// ".reference .destructors_used" directive after the static ctor/dtor
   /// list.  This directive is only emitted in Static relocation model.  Default
   /// is false.
   bool HasStaticCtorDtorReferenceInStaticMode;
 
-  /// True if the linker has a bug and requires that the debug_line section be
-  /// of a minimum size. In practice such a linker requires a non-empty line
-  /// sequence if a file is present.  Default to false.
-  bool LinkerRequiresNonEmptyDwarfLines;
-
   /// This is the maximum possible length of an instruction, which is needed to
   /// compute the size of an inline asm.  Defaults to 4.
   unsigned MaxInstLength;
@@ -128,6 +124,10 @@ protected:
   /// file.  Defaults to "L"
   const char *PrivateGlobalPrefix;
 
+  /// This prefix is used for labels for basic blocks. Defaults to the same as
+  /// PrivateGlobalPrefix.
+  const char *PrivateLabelPrefix;
+
   /// This prefix is used for symbols that should be passed through the
   /// assembler but be removed by the linker.  This is 'l' on Darwin, currently
   /// used for some ObjC metadata.  The default of "" meast that for this system
@@ -220,11 +220,16 @@ protected:
 
   //===--- Global Variable Emission Directives --------------------------===//
 
-  /// This is the directive used to declare a global entity.  Defaults to NULL.
+  /// This is the directive used to declare a global entity. Defaults to
+  /// ".globl".
   const char *GlobalDirective;
 
-  /// True if the assembler supports the .set directive.  Defaults to true.
-  bool HasSetDirective;
+  /// True if the expression
+  ///   .long f - g
+  /// uses an relocation but it can be supressed by writting
+  ///   a = f - g
+  ///   .long a
+  bool SetDirectiveSuppressesReloc;
 
   /// False if the assembler requires that we use
   /// \code
@@ -265,6 +270,9 @@ protected:
   /// to false.
   bool HasNoDeadStrip;
 
+  /// Used to declare a global as being a weak symbol. Defaults to ".weak".
+  const char *WeakDirective;
+
   /// This directive, if non-null, is used to declare a global as being a weak
   /// undefined symbol.  Defaults to NULL.
   const char *WeakRefDirective;
@@ -295,9 +303,6 @@ protected:
 
   //===--- Dwarf Emission Directives -----------------------------------===//
 
-  /// True if target asm supports leb128 directives.  Defaults to false.
-  bool HasLEB128;
-
   /// True if target supports emission of debugging information.  Defaults to
   /// false.
   bool SupportsDebugInformation;
@@ -377,6 +382,12 @@ public:
     return nullptr;
   }
 
+  /// \brief True if the section is atomized using the symbols in it.
+  /// This is false if the section is not atomized at all (most ELF sections) or
+  /// if it is atomized based on its contents (MachO' __TEXT,__cstring for
+  /// example).
+  virtual bool isSectionAtomizableBySymbols(const MCSection &Section) const;
+
   virtual const MCExpr *getExprForPersonalitySymbol(const MCSymbol *Sym,
                                                     unsigned Encoding,
                                                     MCStreamer &Streamer) const;
@@ -404,9 +415,6 @@ public:
   bool hasStaticCtorDtorReferenceInStaticMode() const {
     return HasStaticCtorDtorReferenceInStaticMode;
   }
-  bool getLinkerRequiresNonEmptyDwarfLines() const {
-    return LinkerRequiresNonEmptyDwarfLines;
-  }
   unsigned getMaxInstLength() const { return MaxInstLength; }
   unsigned getMinInstAlignment() const { return MinInstAlignment; }
   bool getDollarIsPC() const { return DollarIsPC; }
@@ -421,6 +429,7 @@ public:
 
   bool useAssignmentForEHBegin() const { return UseAssignmentForEHBegin; }
   const char *getPrivateGlobalPrefix() const { return PrivateGlobalPrefix; }
+  const char *getPrivateLabelPrefix() const { return PrivateLabelPrefix; }
   bool hasLinkerPrivateGlobalPrefix() const {
     return LinkerPrivateGlobalPrefix[0] != '\0';
   }
@@ -445,7 +454,9 @@ public:
   bool getAlignmentIsInBytes() const { return AlignmentIsInBytes; }
   unsigned getTextAlignFillValue() const { return TextAlignFillValue; }
   const char *getGlobalDirective() const { return GlobalDirective; }
-  bool hasSetDirective() const { return HasSetDirective; }
+  bool doesSetDirectiveSuppressesReloc() const {
+    return SetDirectiveSuppressesReloc;
+  }
   bool hasAggressiveSymbolFolding() const { return HasAggressiveSymbolFolding; }
   bool getCOMMDirectiveAlignmentIsInBytes() const {
     return COMMDirectiveAlignmentIsInBytes;
@@ -457,6 +468,7 @@ public:
   bool hasSingleParameterDotFile() const { return HasSingleParameterDotFile; }
   bool hasIdentDirective() const { return HasIdentDirective; }
   bool hasNoDeadStrip() const { return HasNoDeadStrip; }
+  const char *getWeakDirective() const { return WeakDirective; }
   const char *getWeakRefDirective() const { return WeakRefDirective; }
   bool hasWeakDefDirective() const { return HasWeakDefDirective; }
   bool hasWeakDefCanBeHiddenDirective() const {
@@ -471,19 +483,27 @@ public:
   MCSymbolAttr getProtectedVisibilityAttr() const {
     return ProtectedVisibilityAttr;
   }
-  bool hasLEB128() const { return HasLEB128; }
   bool doesSupportDebugInformation() const { return SupportsDebugInformation; }
   bool doesSupportExceptionHandling() const {
     return ExceptionsType != ExceptionHandling::None;
   }
   ExceptionHandling getExceptionHandlingType() const { return ExceptionsType; }
   WinEH::EncodingType getWinEHEncodingType() const { return WinEHEncodingType; }
-  bool isExceptionHandlingDwarf() const {
+
+  /// Return true if the exception handling type uses the language-specific data
+  /// area (LSDA) format specified by the Itanium C++ ABI.
+  bool usesItaniumLSDAForExceptions() const {
     return (ExceptionsType == ExceptionHandling::DwarfCFI ||
             ExceptionsType == ExceptionHandling::ARM ||
-            // Windows handler data still uses DWARF LSDA encoding.
-            ExceptionsType == ExceptionHandling::WinEH);
+            // This Windows EH type uses the Itanium LSDA encoding.
+            ExceptionsType == ExceptionHandling::ItaniumWinEH);
   }
+
+  bool usesWindowsCFI() const {
+    return ExceptionsType == ExceptionHandling::ItaniumWinEH ||
+           ExceptionsType == ExceptionHandling::MSVC;
+  }
+
   bool doesDwarfUseRelocationsAcrossSections() const {
     return DwarfUsesRelocationsAcrossSections;
   }