Adds getPointerSize() to the AsmBackend which will be needed by the final patch

for the dwarf .loc support to emit dwarf line number tables.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@115153 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Target/TargetAsmBackend.h

@@ -101,6 +101,9 @@ public:
   /// has no actual object file contents.
   virtual bool isVirtualSection(const MCSection &Section) const = 0;
 
+  /// getPointerSize - Get the pointer size in bytes.
+  virtual unsigned getPointerSize() const = 0;
+
   /// ApplyFixup - Apply the \arg Value for given \arg Fixup into the provided
   /// data fragment, at the offset specified by the fixup and following the
   /// fixup kind as appropriate.

lib/Target/ARM/ARMAsmBackend.cpp

@@ -84,6 +84,10 @@ public:
                                /*IsLittleEndian=*/true,
                                /*HasRelocationAddend=*/false);
   }
+
+  unsigned getPointerSize() const {
+    return 4;
+  };
 };
 
 // Fixme: can we raise this to share code between Darwin and ELF?
@@ -116,6 +120,10 @@ public:
     return new MachObjectWriter(OS, /*Is64Bit=*/false);
   }
 
+  unsigned getPointerSize() const {
+    return 4;
+  };
+
   virtual bool doesSectionRequireSymbols(const MCSection &Section) const {
     return false;
   }

lib/Target/X86/X86AsmBackend.cpp

@@ -211,6 +211,10 @@ public:
   ELFX86_32AsmBackend(const Target &T, Triple::OSType OSType)
     : ELFX86AsmBackend(T, OSType) {}
 
+  unsigned getPointerSize() const {
+    return 4;
+  }
+
   MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
     return new ELFObjectWriter(OS, /*Is64Bit=*/false,
                                OSType,
@@ -224,6 +228,10 @@ public:
   ELFX86_64AsmBackend(const Target &T, Triple::OSType OSType)
     : ELFX86AsmBackend(T, OSType) {}
 
+  unsigned getPointerSize() const {
+    return 8;
+  }
+
   MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
     return new ELFObjectWriter(OS, /*Is64Bit=*/true,
                                OSType,
@@ -241,6 +249,13 @@ public:
     HasScatteredSymbols = true;
   }
 
+  unsigned getPointerSize() const {
+    if (Is64Bit)
+      return 8;
+    else
+      return 4;
+  }
+
   MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
     return createWinCOFFObjectWriter(OS, Is64Bit);
   }
@@ -272,6 +287,10 @@ public:
   DarwinX86_32AsmBackend(const Target &T)
     : DarwinX86AsmBackend(T) {}
 
+  unsigned getPointerSize() const {
+    return 4;
+  }
+
   MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
     return new MachObjectWriter(OS, /*Is64Bit=*/false);
   }
@@ -284,6 +303,10 @@ public:
     HasReliableSymbolDifference = true;
   }
 
+  unsigned getPointerSize() const {
+    return 8;
+  }
+
   MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
     return new MachObjectWriter(OS, /*Is64Bit=*/true);
   }