Vendor import of llvm trunk r132879:

http://llvm.org/svn/llvm-project/llvm/trunk@132879

1 files changed, 116 insertions, 0 deletions

diff --git a/lib/CodeGen/AsmPrinter/Win64Exception.cpp b/lib/CodeGen/AsmPrinter/Win64Exception.cpp
new file mode 100644
index 0000000..c2ad5eb
--- /dev/null
+++ b/lib/CodeGen/AsmPrinter/Win64Exception.cpp
@@ -0,0 +1,116 @@
+//===-- CodeGen/AsmPrinter/Win64Exception.cpp - Dwarf Exception Impl ------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains support for writing Win64 exception info into asm files.
+//
+//===----------------------------------------------------------------------===//
+
+#include "DwarfException.h"
+#include "llvm/Module.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineLocation.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCSection.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/Target/Mangler.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetFrameLowering.h"
+#include "llvm/Target/TargetLoweringObjectFile.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetOptions.h"
+#include "llvm/Target/TargetRegisterInfo.h"
+#include "llvm/Support/Dwarf.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/FormattedStream.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/Twine.h"
+using namespace llvm;
+
+Win64Exception::Win64Exception(AsmPrinter *A)
+  : DwarfException(A),
+    shouldEmitPersonality(false), shouldEmitLSDA(false), shouldEmitMoves(false)
+    {}
+
+Win64Exception::~Win64Exception() {}
+
+/// EndModule - Emit all exception information that should come after the
+/// content.
+void Win64Exception::EndModule() {
+}
+
+/// BeginFunction - Gather pre-function exception information. Assumes it's
+/// being emitted immediately after the function entry point.
+void Win64Exception::BeginFunction(const MachineFunction *MF) {
+  shouldEmitMoves = shouldEmitPersonality = shouldEmitLSDA = false;
+
+  // If any landing pads survive, we need an EH table.
+  bool hasLandingPads = !MMI->getLandingPads().empty();
+
+  shouldEmitMoves = Asm->needsSEHMoves();
+
+  const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
+  unsigned PerEncoding = TLOF.getPersonalityEncoding();
+  const Function *Per = MMI->getPersonalities()[MMI->getPersonalityIndex()];
+
+  shouldEmitPersonality = hasLandingPads &&
+    PerEncoding != dwarf::DW_EH_PE_omit && Per;
+
+  unsigned LSDAEncoding = TLOF.getLSDAEncoding();
+  shouldEmitLSDA = shouldEmitPersonality &&
+    LSDAEncoding != dwarf::DW_EH_PE_omit;
+
+  if (!shouldEmitPersonality && !shouldEmitMoves)
+    return;
+
+  Asm->OutStreamer.EmitWin64EHStartProc(Asm->CurrentFnSym);
+
+  if (!shouldEmitPersonality)
+    return;
+
+  MCSymbol *GCCHandlerSym =
+    Asm->GetExternalSymbolSymbol("_GCC_specific_handler");
+  Asm->OutStreamer.EmitWin64EHHandler(GCCHandlerSym, true, true);
+
+  Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_begin",
+                                                Asm->getFunctionNumber()));
+}
+
+/// EndFunction - Gather and emit post-function exception information.
+///
+void Win64Exception::EndFunction() {
+  if (!shouldEmitPersonality && !shouldEmitMoves)
+    return;
+
+  Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_end",
+                                                Asm->getFunctionNumber()));
+
+  // Map all labels and get rid of any dead landing pads.
+  MMI->TidyLandingPads();
+
+  if (shouldEmitPersonality) {
+    const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
+    const Function *Per = MMI->getPersonalities()[MMI->getPersonalityIndex()];
+    const MCSymbol *Sym = TLOF.getCFIPersonalitySymbol(Per, Asm->Mang, MMI);
+
+    Asm->OutStreamer.PushSection();
+    Asm->OutStreamer.EmitWin64EHHandlerData();
+    Asm->OutStreamer.EmitValue(MCSymbolRefExpr::Create(Sym, Asm->OutContext),
+                               4);
+    EmitExceptionTable();
+    Asm->OutStreamer.PopSection();
+  }
+  Asm->OutStreamer.EmitWin64EHEndProc();
+}