Add a TargetMachine hook that verifies DataLayout compatibility

[oota-llvm.git] / lib / CodeGen / AsmPrinter / DwarfCFIException.cpp

diff --git a/lib/CodeGen/AsmPrinter/DwarfCFIException.cpp b/lib/CodeGen/AsmPrinter/DwarfCFIException.cpp
index a3bb5768860ddec4402f0bf3d7dd9b9548946f08..282e2ec31a9a2bc4ea3b19294fb8c6fd0d8c2405 100644 (file)
--- a/lib/CodeGen/AsmPrinter/DwarfCFIException.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfCFIException.cpp
@@ -20,6 +20,7 @@
 #include "llvm/CodeGen/MachineFunction.h"
 #include "llvm/CodeGen/MachineModuleInfo.h"
 #include "llvm/IR/DataLayout.h"
+#include "llvm/IR/Mangler.h"
 #include "llvm/IR/Module.h"
 #include "llvm/MC/MCAsmInfo.h"
 #include "llvm/MC/MCContext.h"
@@ -31,7 +32,6 @@
 #include "llvm/Support/Dwarf.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/FormattedStream.h"
-#include "llvm/Target/Mangler.h"
 #include "llvm/Target/TargetFrameLowering.h"
 #include "llvm/Target/TargetLoweringObjectFile.h"
 #include "llvm/Target/TargetMachine.h"
@@ -39,10 +39,24 @@
 #include "llvm/Target/TargetRegisterInfo.h"
 using namespace llvm;
 
+DwarfCFIExceptionBase::DwarfCFIExceptionBase(AsmPrinter *A)
+    : EHStreamer(A), shouldEmitCFI(false) {}
+
+void DwarfCFIExceptionBase::markFunctionEnd() {
+  if (shouldEmitCFI)
+    Asm->OutStreamer->EmitCFIEndProc();
+
+  if (MMI->getLandingPads().empty())
+    return;
+
+  // Map all labels and get rid of any dead landing pads.
+  MMI->TidyLandingPads();
+}
+
 DwarfCFIException::DwarfCFIException(AsmPrinter *A)
-  : DwarfException(A),
-    shouldEmitPersonality(false), shouldEmitLSDA(false), shouldEmitMoves(false),
-    moveTypeModule(AsmPrinter::CFI_M_None) {}
+    : DwarfCFIExceptionBase(A), shouldEmitPersonality(false),
+      shouldEmitLSDA(false), shouldEmitMoves(false),
+      moveTypeModule(AsmPrinter::CFI_M_None) {}
 
 DwarfCFIException::~DwarfCFIException() {}
 
@@ -50,42 +64,32 @@ DwarfCFIException::~DwarfCFIException() {}
 /// content.
 void DwarfCFIException::endModule() {
   if (moveTypeModule == AsmPrinter::CFI_M_Debug)
-    Asm->OutStreamer.EmitCFISections(false, true);
+    Asm->OutStreamer->EmitCFISections(false, true);
 
-  if (!Asm->MAI->isExceptionHandlingDwarf())
+  // SjLj uses this pass and it doesn't need this info.
+  if (!Asm->MAI->usesCFIForEH())
     return;
 
   const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
 
   unsigned PerEncoding = TLOF.getPersonalityEncoding();
 
-  if ((PerEncoding & 0x70) != dwarf::DW_EH_PE_pcrel)
+  if ((PerEncoding & 0x80) != dwarf::DW_EH_PE_indirect)
     return;
 
   // Emit references to all used personality functions
-  bool AtLeastOne = false;
   const std::vector<const Function*> &Personalities = MMI->getPersonalities();
   for (size_t i = 0, e = Personalities.size(); i != e; ++i) {
     if (!Personalities[i])
       continue;
     MCSymbol *Sym = Asm->getSymbol(Personalities[i]);
-    TLOF.emitPersonalityValue(Asm->OutStreamer, Asm->TM, Sym);
-    AtLeastOne = true;
-  }
-
-  if (AtLeastOne && !TLOF.isFunctionEHFrameSymbolPrivate()) {
-    // This is a temporary hack to keep sections in the same order they
-    // were before. This lets us produce bit identical outputs while
-    // transitioning to CFI.
-    Asm->OutStreamer.SwitchSection(
-               const_cast<TargetLoweringObjectFile&>(TLOF).getEHFrameSection());
+    TLOF.emitPersonalityValue(*Asm->OutStreamer, Asm->getDataLayout(), Sym);
   }
 }
 
-/// beginFunction - Gather pre-function exception information. Assumes it's
-/// being emitted immediately after the function entry point.
 void DwarfCFIException::beginFunction(const MachineFunction *MF) {
   shouldEmitMoves = shouldEmitPersonality = shouldEmitLSDA = false;
+  const Function *F = MF->getFunction();
 
   // If any landing pads survive, we need an EH table.
   bool hasLandingPads = !MMI->getLandingPads().empty();
@@ -101,56 +105,60 @@ void DwarfCFIException::beginFunction(const MachineFunction *MF) {
 
   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;
+  const Function *Per = nullptr;
+  if (F->hasPersonalityFn())
+    Per = dyn_cast<Function>(F->getPersonalityFn()->stripPointerCasts());
+  assert(!MMI->getPersonality() || Per == MMI->getPersonality());
+
+  // Emit a personality function even when there are no landing pads
+  bool forceEmitPersonality =
+      // ...if a personality function is explicitly specified
+      F->hasPersonalityFn() &&
+      // ... and it's not known to be a noop in the absence of invokes
+      !isNoOpWithoutInvoke(classifyEHPersonality(Per)) &&
+      // ... and we're not explicitly asked not to emit it
+      F->needsUnwindTableEntry();
+
+  shouldEmitPersonality =
+      (forceEmitPersonality ||
+       (hasLandingPads && PerEncoding != dwarf::DW_EH_PE_omit)) &&
+      Per;
 
   unsigned LSDAEncoding = TLOF.getLSDAEncoding();
   shouldEmitLSDA = shouldEmitPersonality &&
     LSDAEncoding != dwarf::DW_EH_PE_omit;
 
-  if (!shouldEmitPersonality && !shouldEmitMoves)
+  shouldEmitCFI = shouldEmitPersonality || shouldEmitMoves;
+  if (!shouldEmitCFI)
     return;
 
-  Asm->OutStreamer.EmitCFIStartProc();
+  Asm->OutStreamer->EmitCFIStartProc(/*IsSimple=*/false);
 
   // Indicate personality routine, if any.
   if (!shouldEmitPersonality)
     return;
 
-  const MCSymbol *Sym = TLOF.getCFIPersonalitySymbol(Per, Asm->Mang, MMI);
-  Asm->OutStreamer.EmitCFIPersonality(Sym, PerEncoding);
+  // If we are forced to emit this personality, make sure to record
+  // it because it might not appear in any landingpad
+  if (forceEmitPersonality)
+    MMI->addPersonality(Per);
 
-  Asm->OutStreamer.EmitDebugLabel
-    (Asm->GetTempSymbol("eh_func_begin",
-                        Asm->getFunctionNumber()));
+  const MCSymbol *Sym =
+      TLOF.getCFIPersonalitySymbol(Per, *Asm->Mang, Asm->TM, MMI);
+  Asm->OutStreamer->EmitCFIPersonality(Sym, PerEncoding);
 
   // Provide LSDA information.
   if (!shouldEmitLSDA)
     return;
 
-  Asm->OutStreamer.EmitCFILsda(Asm->GetTempSymbol("exception",
-                                                  Asm->getFunctionNumber()),
-                               LSDAEncoding);
+  Asm->OutStreamer->EmitCFILsda(Asm->getCurExceptionSym(), LSDAEncoding);
 }
 
 /// endFunction - Gather and emit post-function exception information.
 ///
-void DwarfCFIException::endFunction() {
-  if (!shouldEmitPersonality && !shouldEmitMoves)
-    return;
-
-  Asm->OutStreamer.EmitCFIEndProc();
-
+void DwarfCFIException::endFunction(const MachineFunction *) {
   if (!shouldEmitPersonality)
     return;
 
-  Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_end",
-                                                Asm->getFunctionNumber()));
-
-  // Map all labels and get rid of any dead landing pads.
-  MMI->TidyLandingPads();
-
-  EmitExceptionTable();
+  emitExceptionTable();
 }