[WinEH] Run cleanup handlers when an exception is thrown

Generate tables in the .xdata section representing what actions to take
when an exception is thrown.  This currently fills in state for
cleanups, catch handlers are still unfinished.

llvm-svn: 233636

llvm/lib/CodeGen/MachineModuleInfo.cpp

@@ -14,6 +14,7 @@
 #include "llvm/CodeGen/MachineFunction.h"
 #include "llvm/CodeGen/MachineFunctionPass.h"
 #include "llvm/CodeGen/Passes.h"
+#include "llvm/CodeGen/WinEHFuncInfo.h"
 #include "llvm/IR/Constants.h"
 #include "llvm/IR/DerivedTypes.h"
 #include "llvm/IR/GlobalVariable.h"
@@ -425,6 +426,12 @@ void MachineModuleInfo::addPersonality(MachineBasicBlock *LandingPad,
     Personalities.push_back(Personality);
 }
 
+void MachineModuleInfo::addWinEHState(MachineBasicBlock *LandingPad,
+                                      int State) {
+  LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
+  LP.WinEHState = State;
+}
+
 /// addCatchTypeInfo - Provide the catch typeinfo for a landing pad.
 ///
 void MachineModuleInfo::
@@ -588,3 +595,18 @@ unsigned MachineModuleInfo::getPersonalityIndex() const {
   // in the zero index.
   return 0;
 }
+
+const Function *MachineModuleInfo::getWinEHParent(const Function *F) const {
+  StringRef WinEHParentName =
+      F->getFnAttribute("wineh-parent").getValueAsString();
+  if (WinEHParentName.empty() || WinEHParentName == F->getName())
+    return F;
+  return F->getParent()->getFunction(WinEHParentName);
+}
+
+WinEHFuncInfo &MachineModuleInfo::getWinEHFuncInfo(const Function *F) {
+  auto &Ptr = FuncInfoMap[getWinEHParent(F)];
+  if (!Ptr)
+    Ptr.reset(new WinEHFuncInfo);
+  return *Ptr;
+}