[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

1 files changed, 20 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/PrologEpilogInserter.cpp b/llvm/lib/CodeGen/PrologEpilogInserter.cpp
index e073e6a8437..5334a633ead 100644
--- a/llvm/lib/CodeGen/PrologEpilogInserter.cpp
+++ b/llvm/lib/CodeGen/PrologEpilogInserter.cpp
@@ -30,6 +30,7 @@
 #include "llvm/CodeGen/Passes.h"
 #include "llvm/CodeGen/RegisterScavenging.h"
 #include "llvm/CodeGen/StackProtector.h"
+#include "llvm/CodeGen/WinEHFuncInfo.h"
 #include "llvm/IR/DiagnosticInfo.h"
 #include "llvm/IR/InlineAsm.h"
 #include "llvm/IR/LLVMContext.h"
@@ -752,6 +753,25 @@ void PEI::replaceFrameIndices(MachineFunction &Fn) {
   const TargetFrameLowering &TFI = *Fn.getSubtarget().getFrameLowering();
   if (!TFI.needsFrameIndexResolution(Fn)) return;
 
+  MachineModuleInfo &MMI = Fn.getMMI();
+  const Function *F = Fn.getFunction();
+  const Function *ParentF = MMI.getWinEHParent(F);
+  unsigned FrameReg;
+  if (F == ParentF) {
+    WinEHFuncInfo &FuncInfo = MMI.getWinEHFuncInfo(Fn.getFunction());
+    // FIXME: This should be unconditional but we have bugs in the preparation
+    // pass.
+    if (FuncInfo.UnwindHelpFrameIdx != INT_MAX)
+      FuncInfo.UnwindHelpFrameOffset = TFI.getFrameIndexReferenceFromSP(
+          Fn, FuncInfo.UnwindHelpFrameIdx, FrameReg);
+  } else if (MMI.hasWinEHFuncInfo(F)) {
+    WinEHFuncInfo &FuncInfo = MMI.getWinEHFuncInfo(Fn.getFunction());
+    auto I = FuncInfo.CatchHandlerParentFrameObjIdx.find(F);
+    if (I != FuncInfo.CatchHandlerParentFrameObjIdx.end())
+      FuncInfo.CatchHandlerParentFrameObjOffset[F] =
+          TFI.getFrameIndexReferenceFromSP(Fn, I->second, FrameReg);
+  }
+
   // Store SPAdj at exit of a basic block.
   SmallVector<int, 8> SPState;
   SPState.resize(Fn.getNumBlockIDs());