From aa5f4d2e23d34ac08cb7eb0f8810cc9db4760f3a Mon Sep 17 00:00:00 2001
From: Chandler Carruth <chandlerc@gmail.com>
Date: Fri, 22 Jun 2018 05:33:57 +0000
Subject: Revert r335306 (and r335314) - the Call Graph Profile pass.

This is the first pass in the main pipeline to use the legacy PM's
ability to run function analyses "on demand". Unfortunately, it turns
out there are bugs in that somewhat-hacky approach. At the very least,
it leaks memory and doesn't support -debug-pass=Structure. Unclear if
there are larger issues or not, but this should get the sanitizer bots
back to green by fixing the memory leaks.

llvm-svn: 335320
---
 llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp | 54 +++--------------------
 1 file changed, 7 insertions(+), 47 deletions(-)

(limited to 'llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp')

diff --git a/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp b/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
index 24ff42a34ffa..df8aecd7cf42 100644
--- a/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
+++ b/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
@@ -91,12 +91,6 @@ static void GetObjCImageInfo(Module &M, unsigned &Version, unsigned &Flags,
 //                                  ELF
 //===----------------------------------------------------------------------===//
 
-void TargetLoweringObjectFileELF::Initialize(MCContext &Ctx,
-                                             const TargetMachine &TgtM) {
-  TargetLoweringObjectFile::Initialize(Ctx, TgtM);
-  TM = &TgtM;
-}
-
 void TargetLoweringObjectFileELF::emitModuleMetadata(MCStreamer &Streamer,
                                                      Module &M) const {
   auto &C = getContext();
@@ -122,49 +116,15 @@ void TargetLoweringObjectFileELF::emitModuleMetadata(MCStreamer &Streamer,
   StringRef Section;
 
   GetObjCImageInfo(M, Version, Flags, Section);
-  if (!Section.empty()) {
-    auto *S = C.getELFSection(Section, ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
-    Streamer.SwitchSection(S);
-    Streamer.EmitLabel(C.getOrCreateSymbol(StringRef("OBJC_IMAGE_INFO")));
-    Streamer.EmitIntValue(Version, 4);
-    Streamer.EmitIntValue(Flags, 4);
-    Streamer.AddBlankLine();
-  }
-
-  SmallVector<Module::ModuleFlagEntry, 8> ModuleFlags;
-  M.getModuleFlagsMetadata(ModuleFlags);
-
-  MDNode *CFGProfile = nullptr;
-
-  for (const auto &MFE : ModuleFlags) {
-    StringRef Key = MFE.Key->getString();
-    if (Key == "CG Profile") {
-      CFGProfile = cast<MDNode>(MFE.Val);
-      break;
-    }
-  }
-
-  if (!CFGProfile)
+  if (Section.empty())
     return;
 
-  auto GetSym = [this](const MDOperand &MDO) {
-    auto V = cast<ValueAsMetadata>(MDO);
-    const Function *F = cast<Function>(V->getValue());
-    return TM->getSymbol(F);
-  };
-
-  for (const auto &Edge : CFGProfile->operands()) {
-    MDNode *E = cast<MDNode>(Edge);
-    const MCSymbol *From = GetSym(E->getOperand(0));
-    const MCSymbol *To = GetSym(E->getOperand(1));
-    uint64_t Count = cast<ConstantAsMetadata>(E->getOperand(2))
-                         ->getValue()
-                         ->getUniqueInteger()
-                         .getZExtValue();
-    Streamer.emitCGProfileEntry(
-        MCSymbolRefExpr::create(From, MCSymbolRefExpr::VK_None, C),
-        MCSymbolRefExpr::create(To, MCSymbolRefExpr::VK_None, C), Count);
-  }
+  auto *S = C.getELFSection(Section, ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
+  Streamer.SwitchSection(S);
+  Streamer.EmitLabel(C.getOrCreateSymbol(StringRef("OBJC_IMAGE_INFO")));
+  Streamer.EmitIntValue(Version, 4);
+  Streamer.EmitIntValue(Flags, 4);
+  Streamer.AddBlankLine();
 }
 
 MCSymbol *TargetLoweringObjectFileELF::getCFIPersonalitySymbol(
-- 
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