ARM BL/BLX instruction fixups should use relocations.

We on the linker to resolve calls to the appropriate BL/BLX instruction
to make interworking function correctly. It uses the symbol in the
relocation to do that, so we need to be careful about being too clever.

To enable this for ARM mode, split the BL/BLX fixup kind off from the
unconditional-branch fixups.

rdar://10927209

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151571 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 2 deletions

diff --git a/include/llvm/MC/MCAsmBackend.h b/include/llvm/MC/MCAsmBackend.h
index 11a081b207..641ded5ef0 100644
--- a/include/llvm/MC/MCAsmBackend.h
+++ b/include/llvm/MC/MCAsmBackend.h
@@ -92,11 +92,13 @@ public:
   virtual const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const;
 
   /// processFixupValue - Target hook to adjust the literal value of a fixup
-  /// if necessary. The default does nothing.
+  /// if necessary. IsResolved signals whether the caller believes a relocation
+  /// is needed; the target can modify the value. The default does nothing.
   virtual void processFixupValue(const MCAssembler &Asm,
                                  const MCAsmLayout &Layout,
                                  const MCFixup &Fixup, const MCFragment *DF,
-                                 MCValue &Target, uint64_t &Value) {}
+                                 MCValue &Target, uint64_t &Value,
+                                 bool &IsResolved) {}
 
   /// @}