From 3b94e33277beebd8ec3e654702d4fa912803115d Mon Sep 17 00:00:00 2001
From: Eric Christopher <echristo@gmail.com>
Date: Fri, 27 Feb 2015 19:03:38 +0000
Subject: Remove the Forward Control Flow Integrity pass and its dependencies.

This work is currently being rethought along different lines and
if this work is needed it can be resurrected out of svn. Remove it
for now as no current work in ongoing on it and it's unused. Verified
with the authors before removal.

llvm-svn: 230780
---
 llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp | 53 ------------------------------
 1 file changed, 53 deletions(-)

(limited to 'llvm/lib/CodeGen/AsmPrinter')

diff --git a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
index b94278fae07..1cb14f0833d 100644
--- a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -1018,59 +1018,6 @@ bool AsmPrinter::doFinalization(Module &M) {
     EmitVisibility(Name, V, false);
   }
 
-  // Get information about jump-instruction tables to print.
-  JumpInstrTableInfo *JITI = getAnalysisIfAvailable<JumpInstrTableInfo>();
-
-  if (JITI && !JITI->getTables().empty()) {
-    // Since we're at the module level we can't use a function specific
-    // MCSubtargetInfo - instead create one with the module defaults.
-    std::unique_ptr<MCSubtargetInfo> STI(TM.getTarget().createMCSubtargetInfo(
-        TM.getTargetTriple(), TM.getTargetCPU(), TM.getTargetFeatureString()));
-    unsigned Arch = Triple(getTargetTriple()).getArch();
-    bool IsThumb = (Arch == Triple::thumb || Arch == Triple::thumbeb);
-    const TargetInstrInfo *TII = TM.getSubtargetImpl()->getInstrInfo();
-    MCInst TrapInst;
-    TII->getTrap(TrapInst);
-    unsigned LogAlignment = llvm::Log2_64(JITI->entryByteAlignment());
-
-    // Emit the right section for these functions.
-    OutStreamer.SwitchSection(OutContext.getObjectFileInfo()->getTextSection());
-    for (const auto &KV : JITI->getTables()) {
-      uint64_t Count = 0;
-      for (const auto &FunPair : KV.second) {
-        // Emit the function labels to make this be a function entry point.
-        MCSymbol *FunSym =
-          OutContext.GetOrCreateSymbol(FunPair.second->getName());
-        EmitAlignment(LogAlignment);
-        if (IsThumb)
-          OutStreamer.EmitThumbFunc(FunSym);
-        if (MAI->hasDotTypeDotSizeDirective())
-          OutStreamer.EmitSymbolAttribute(FunSym, MCSA_ELF_TypeFunction);
-        OutStreamer.EmitLabel(FunSym);
-
-        // Emit the jump instruction to transfer control to the original
-        // function.
-        MCInst JumpToFun;
-        MCSymbol *TargetSymbol =
-          OutContext.GetOrCreateSymbol(FunPair.first->getName());
-        const MCSymbolRefExpr *TargetSymRef =
-          MCSymbolRefExpr::Create(TargetSymbol, MCSymbolRefExpr::VK_PLT,
-                                  OutContext);
-        TII->getUnconditionalBranch(JumpToFun, TargetSymRef);
-        OutStreamer.EmitInstruction(JumpToFun, *STI);
-        ++Count;
-      }
-
-      // Emit enough padding instructions to fill up to the next power of two.
-      uint64_t Remaining = NextPowerOf2(Count) - Count;
-      for (uint64_t C = 0; C < Remaining; ++C) {
-        EmitAlignment(LogAlignment);
-        OutStreamer.EmitInstruction(TrapInst, *STI);
-      }
-
-    }
-  }
-
   // Emit module flags.
   SmallVector<Module::ModuleFlagEntry, 8> ModuleFlags;
   M.getModuleFlagsMetadata(ModuleFlags);
-- 
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