Refactor a lot of patchpoint/stackmap related code to simplify and make it

target independent.

Most of the x86 specific stackmap/patchpoint handling was necessitated by the
use of the native address-mode format for frame index operands. PEI has now
been modified to treat stackmap/patchpoint similarly to DEBUG_INFO, allowing
us to use a simple, platform independent register/offset pair for frame
indexes on stackmap/patchpoints.

Notes:
  - Folding is now platform independent and automatically supported.
  - Emiting patchpoints with direct memory references now just involves calling
    the TargetLoweringBase::emitPatchPoint utility method from the target's
    XXXTargetLowering::EmitInstrWithCustomInserter method. (See
    X86TargetLowering for an example).
  - No more ugly platform-specific operand parsers.

This patch shouldn't change the generated output for X86. 



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@195944 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/StackMaps.h

@@ -92,19 +92,12 @@ public:
       : LocType(LocType), Size(Size), Reg(Reg), Offset(Offset) {}
   };
 
-  // Typedef a function pointer for functions that parse sequences of operands
-  // and return a Location, plus a new "next" operand iterator.
-  typedef std::pair<Location, MachineInstr::const_mop_iterator>
-    (*OperandParser)(MachineInstr::const_mop_iterator,
-                     MachineInstr::const_mop_iterator, const TargetMachine&);
-
   // OpTypes are used to encode information about the following logical
   // operand (which may consist of several MachineOperands) for the
   // OpParser.
   typedef enum { DirectMemRefOp, IndirectMemRefOp, ConstantOp } OpType;
 
-  StackMaps(AsmPrinter &AP, OperandParser OpParser)
-    : AP(AP), OpParser(OpParser) {}
+  StackMaps(AsmPrinter &AP) : AP(AP) {}
 
   /// \brief Generate a stackmap record for a stackmap instruction.
   ///
@@ -155,10 +148,15 @@ private:
   };
 
   AsmPrinter &AP;
-  OperandParser OpParser;
   CallsiteInfoList CSInfos;
   ConstantPool ConstPool;
 
+  /// Parse 
+  std::pair<Location, MachineInstr::const_mop_iterator>
+  parseOperand(MachineInstr::const_mop_iterator MOI,
+               MachineInstr::const_mop_iterator MOE);
+               
+
   /// This should be called by the MC lowering code _immediately_ before
   /// lowering the MI to an MCInst. It records where the operands for the
   /// instruction are stored, and outputs a label to record the offset of