change EH related stuff (other than EH_LABEL) to use MCSymbol

instead of label ID's.  This cleans up and regularizes a bunch 
of code and makes way for future progress.

Unfortunately, this pointed out to me that JITDwarfEmitter.cpp
is largely copy and paste from DwarfException/MachineModuleInfo
and other places.  This is very sad and disturbing. :(

One major change here is that TidyLandingPads moved from being
called in DwarfException::BeginFunction to being called in
DwarfException::EndFunction.  There should not be any 
functionality change from doing this, but I'm not an EH expert.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98459 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/JITCodeEmitter.h

@@ -35,7 +35,7 @@ class MachineRelocation;
 class Value;
 class GlobalValue;
 class Function;
-
+  
 /// JITCodeEmitter - This class defines two sorts of methods: those for
 /// emitting the actual bytes of machine code, and those for emitting auxillary
 /// structures, such as jump tables, relocations, etc.
@@ -242,7 +242,7 @@ public:
   
   
   /// emitLabel - Emits a label
-  virtual void emitLabel(uint64_t LabelID) = 0;
+  virtual void emitLabel(MCSymbol *Label) = 0;
 
   /// allocateSpace - Allocate a block of space in the current output buffer,
   /// returning null (and setting conditions to indicate buffer overflow) on
@@ -316,10 +316,10 @@ public:
   ///
   virtual uintptr_t getMachineBasicBlockAddress(MachineBasicBlock *MBB) const= 0;
 
-  /// getLabelAddress - Return the address of the specified LabelID, only usable
-  /// after the LabelID has been emitted.
+  /// getLabelAddress - Return the address of the specified Label, only usable
+  /// after the Label has been emitted.
   ///
-  virtual uintptr_t getLabelAddress(uint64_t LabelID) const = 0;
+  virtual uintptr_t getLabelAddress(MCSymbol *Label) const = 0;
   
   /// Specifies the MachineModuleInfo object. This is used for exception handling
   /// purposes.

include/llvm/CodeGen/MachineCodeEmitter.h

@@ -31,6 +31,7 @@ class MachineRelocation;
 class Value;
 class GlobalValue;
 class Function;
+class MCSymbol;
 
 /// MachineCodeEmitter - This class defines two sorts of methods: those for
 /// emitting the actual bytes of machine code, and those for emitting auxillary
@@ -247,7 +248,7 @@ public:
   virtual void processDebugLoc(DebugLoc DL, bool BeforePrintintInsn) {}
 
   /// emitLabel - Emits a label
-  virtual void emitLabel(uint64_t LabelID) = 0;
+  virtual void emitLabel(MCSymbol *Label) = 0;
 
   /// allocateSpace - Allocate a block of space in the current output buffer,
   /// returning null (and setting conditions to indicate buffer overflow) on
@@ -316,10 +317,10 @@ public:
   ///
   virtual uintptr_t getMachineBasicBlockAddress(MachineBasicBlock *MBB) const= 0;
 
-  /// getLabelAddress - Return the address of the specified LabelID, only usable
+  /// getLabelAddress - Return the address of the specified Label, only usable
   /// after the LabelID has been emitted.
   ///
-  virtual uintptr_t getLabelAddress(uint64_t LabelID) const = 0;
+  virtual uintptr_t getLabelAddress(MCSymbol *Label) const = 0;
   
   /// Specifies the MachineModuleInfo object. This is used for exception handling
   /// purposes.

include/llvm/CodeGen/MachineModuleInfo.h

@@ -77,18 +77,15 @@ protected:
 /// the current function.
 ///
 struct LandingPadInfo {
-  MachineBasicBlock *LandingPadBlock;   // Landing pad block.
-  SmallVector<unsigned, 1> BeginLabels; // Labels prior to invoke.
-  SmallVector<unsigned, 1> EndLabels;   // Labels after invoke.
-  unsigned LandingPadLabel;             // Label at beginning of landing pad.
-  Function *Personality;                // Personality function.
-  std::vector<int> TypeIds;             // List of type ids (filters negative)
+  MachineBasicBlock *LandingPadBlock;    // Landing pad block.
+  SmallVector<MCSymbol*, 1> BeginLabels; // Labels prior to invoke.
+  SmallVector<MCSymbol*, 1> EndLabels;   // Labels after invoke.
+  MCSymbol *LandingPadLabel;             // Label at beginning of landing pad.
+  Function *Personality;                 // Personality function.
+  std::vector<int> TypeIds;              // List of type ids (filters negative)
 
   explicit LandingPadInfo(MachineBasicBlock *MBB)
-  : LandingPadBlock(MBB)
-  , LandingPadLabel(0)
-  , Personality(NULL)  
-  {}
+    : LandingPadBlock(MBB), LandingPadLabel(0), Personality(0) {}
 };
 
 //===----------------------------------------------------------------------===//
@@ -121,7 +118,7 @@ class MachineModuleInfo : public ImmutablePass {
 
   // Map of invoke call site index values to associated begin EH_LABEL for
   // the current function.
-  DenseMap<unsigned, unsigned> CallSiteMap;
+  DenseMap<MCSymbol*, unsigned> CallSiteMap;
 
   // The current call site index being processed, if any. 0 if none.
   unsigned CurCallSite;
@@ -215,6 +212,9 @@ public:
     return ID;
   }
   
+  /// getLabelSym - Turn a label ID into a symbol.
+  MCSymbol *getLabelSym(unsigned ID);
+  
   /// InvalidateLabel - Inhibit use of the specified label # from
   /// MachineModuleInfo, for example because the code was deleted.
   void InvalidateLabel(unsigned LabelID) {
@@ -245,8 +245,8 @@ public:
 
   /// addInvoke - Provide the begin and end labels of an invoke style call and
   /// associate it with a try landing pad block.
-  void addInvoke(MachineBasicBlock *LandingPad, unsigned BeginLabel,
-                                                unsigned EndLabel);
+  void addInvoke(MachineBasicBlock *LandingPad,
+                 MCSymbol *BeginLabel, MCSymbol *EndLabel);
   
   /// addLandingPad - Add a new panding pad.  Returns the label ID for the 
   /// landing pad entry.
@@ -305,12 +305,12 @@ public:
   }
 
   /// setCallSiteBeginLabel - Map the begin label for a call site
-  void setCallSiteBeginLabel(unsigned BeginLabel, unsigned Site) {
+  void setCallSiteBeginLabel(MCSymbol *BeginLabel, unsigned Site) {
     CallSiteMap[BeginLabel] = Site;
   }
 
   /// getCallSiteBeginLabel - Get the call site number for a begin label
-  unsigned getCallSiteBeginLabel(unsigned BeginLabel) {
+  unsigned getCallSiteBeginLabel(MCSymbol *BeginLabel) {
     assert(CallSiteMap.count(BeginLabel) &&
            "Missing call site number for EH_LABEL!");
     return CallSiteMap[BeginLabel];

include/llvm/CodeGen/ObjectCodeEmitter.h

@@ -137,13 +137,6 @@ public:
   /// emitted.
   virtual uintptr_t getMachineBasicBlockAddress(MachineBasicBlock *MBB) const;
 
-  /// emitLabel - Emits a label
-  virtual void emitLabel(uint64_t LabelID) = 0;
-
-  /// getLabelAddress - Return the address of the specified LabelID, only usable
-  /// after the LabelID has been emitted.
-  virtual uintptr_t getLabelAddress(uint64_t LabelID) const = 0;
-
   /// emitJumpTables - Emit all the jump tables for a given jump table info
   /// record to the appropriate section.
   virtual void emitJumpTables(MachineJumpTableInfo *MJTI) = 0;