ARM: allow .thumb_func to be separated from symbol definition

[oota-llvm.git] / include / llvm / MC / MCAsmBackend.h

diff --git a/include/llvm/MC/MCAsmBackend.h b/include/llvm/MC/MCAsmBackend.h
index 4d0b9502af791a49c1c6acc025ad8f5e34dcef62..f946f41981c8ad5f7b0719da085d91f05f49a937 100644 (file)
--- a/include/llvm/MC/MCAsmBackend.h
+++ b/include/llvm/MC/MCAsmBackend.h
@@ -10,7 +10,9 @@
 #ifndef LLVM_MC_MCASMBACKEND_H
 #define LLVM_MC_MCASMBACKEND_H
 
+#include "llvm/ADT/ArrayRef.h"
 #include "llvm/MC/MCDirectives.h"
+#include "llvm/MC/MCDwarf.h"
 #include "llvm/MC/MCFixup.h"
 #include "llvm/Support/DataTypes.h"
 #include "llvm/Support/ErrorHandling.h"
@@ -22,7 +24,7 @@ class MCELFObjectTargetWriter;
 struct MCFixupKindInfo;
 class MCFragment;
 class MCInst;
-class MCInstFragment;
+class MCRelaxableFragment;
 class MCObjectWriter;
 class MCSection;
 class MCValue;
@@ -32,21 +34,26 @@ class raw_ostream;
 class MCAsmBackend {
   MCAsmBackend(const MCAsmBackend &) LLVM_DELETED_FUNCTION;
   void operator=(const MCAsmBackend &) LLVM_DELETED_FUNCTION;
+
 protected: // Can only create subclasses.
   MCAsmBackend();
 
   unsigned HasReliableSymbolDifference : 1;
+  unsigned HasDataInCodeSupport : 1;
 
 public:
   virtual ~MCAsmBackend();
 
+  /// lifetime management
+  virtual void reset() {}
+
   /// createObjectWriter - Create a new MCObjectWriter instance for use by the
   /// assembler backend to emit the final object file.
   virtual MCObjectWriter *createObjectWriter(raw_ostream &OS) const = 0;
 
   /// createELFObjectTargetWriter - Create a new ELFObjectTargetWriter to enable
   /// non-standard ELFObjectWriters.
-  virtual  MCELFObjectTargetWriter *createELFObjectTargetWriter() const {
+  virtual MCELFObjectTargetWriter *createELFObjectTargetWriter() const {
     llvm_unreachable("createELFObjectTargetWriter is not supported by asm "
                      "backend");
   }
@@ -65,6 +72,10 @@ public:
     return HasReliableSymbolDifference;
   }
 
+  /// hasDataInCodeSupport - Check whether this target implements data-in-code
+  /// markers. If not, data region directives will be ignored.
+  bool hasDataInCodeSupport() const { return HasDataInCodeSupport; }
+
   /// doesSectionRequireSymbols - Check whether the given section requires that
   /// all symbols (even temporaries) have symbol table entries.
   virtual bool doesSectionRequireSymbols(const MCSection &Section) const {
@@ -99,7 +110,7 @@ public:
 
   /// @}
 
-  /// applyFixup - Apply the \arg Value for given \arg Fixup into the provided
+  /// applyFixup - Apply the \p Value for given \p Fixup into the provided
   /// data fragment, at the offset specified by the fixup and following the
   /// fixup kind as appropriate.
   virtual void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
@@ -118,9 +129,8 @@ public:
 
   /// fixupNeedsRelaxation - Target specific predicate for whether a given
   /// fixup requires the associated instruction to be relaxed.
-  virtual bool fixupNeedsRelaxation(const MCFixup &Fixup,
-                                    uint64_t Value,
-                                    const MCInstFragment *DF,
+  virtual bool fixupNeedsRelaxation(const MCFixup &Fixup, uint64_t Value,
+                                    const MCRelaxableFragment *DF,
                                     const MCAsmLayout &Layout) const = 0;
 
   /// RelaxInstruction - Relax the instruction in the given fragment to the next
@@ -150,6 +160,12 @@ public:
   /// handleAssemblerFlag - Handle any target-specific assembler flags.
   /// By default, do nothing.
   virtual void handleAssemblerFlag(MCAssemblerFlag Flag) {}
+
+  /// \brief Generate the compact unwind encoding for the CFI instructions.
+  virtual uint32_t
+  generateCompactUnwindEncoding(ArrayRef<MCCFIInstruction>) const {
+    return 0;
+  }
 };
 
 } // End llvm namespace