1 files changed, 365 insertions, 0 deletions
diff --git a/contrib/llvm/lib/IR/DebugInfo.cpp b/contrib/llvm/lib/IR/DebugInfo.cpp
new file mode 100644
index 0000000..a2443be
--- /dev/null
+++ b/contrib/llvm/lib/IR/DebugInfo.cpp
@@ -0,0 +1,365 @@
+//===--- DebugInfo.cpp - Debug Information Helper Classes -----------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the helper classes used to build and interpret debug
+// information in LLVM IR form.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/IR/DebugInfo.h"
+#include "LLVMContextImpl.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/Analysis/ValueTracking.h"
+#include "llvm/IR/Constants.h"
+#include "llvm/IR/DIBuilder.h"
+#include "llvm/IR/DerivedTypes.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/IR/IntrinsicInst.h"
+#include "llvm/IR/Intrinsics.h"
+#include "llvm/IR/GVMaterializer.h"
+#include "llvm/IR/Module.h"
+#include "llvm/IR/ValueHandle.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/Dwarf.h"
+#include "llvm/Support/raw_ostream.h"
+using namespace llvm;
+using namespace llvm::dwarf;
+
+DISubprogram *llvm::getDISubprogram(const MDNode *Scope) {
+  if (auto *LocalScope = dyn_cast_or_null<DILocalScope>(Scope))
+    return LocalScope->getSubprogram();
+  return nullptr;
+}
+
+DISubprogram *llvm::getDISubprogram(const Function *F) {
+  // We look for the first instr that has a debug annotation leading back to F.
+  for (auto &BB : *F) {
+    auto Inst = std::find_if(BB.begin(), BB.end(), [](const Instruction &Inst) {
+      return Inst.getDebugLoc();
+    });
+    if (Inst == BB.end())
+      continue;
+    DebugLoc DLoc = Inst->getDebugLoc();
+    const MDNode *Scope = DLoc.getInlinedAtScope();
+    auto *Subprogram = getDISubprogram(Scope);
+    return Subprogram->describes(F) ? Subprogram : nullptr;
+  }
+
+  return nullptr;
+}
+
+DITypeIdentifierMap
+llvm::generateDITypeIdentifierMap(const NamedMDNode *CU_Nodes) {
+  DITypeIdentifierMap Map;
+  for (unsigned CUi = 0, CUe = CU_Nodes->getNumOperands(); CUi != CUe; ++CUi) {
+    auto *CU = cast<DICompileUnit>(CU_Nodes->getOperand(CUi));
+    DINodeArray Retain = CU->getRetainedTypes();
+    for (unsigned Ti = 0, Te = Retain.size(); Ti != Te; ++Ti) {
+      if (!isa<DICompositeType>(Retain[Ti]))
+        continue;
+      auto *Ty = cast<DICompositeType>(Retain[Ti]);
+      if (MDString *TypeId = Ty->getRawIdentifier()) {
+        // Definition has priority over declaration.
+        // Try to insert (TypeId, Ty) to Map.
+        std::pair<DITypeIdentifierMap::iterator, bool> P =
+            Map.insert(std::make_pair(TypeId, Ty));
+        // If TypeId already exists in Map and this is a definition, replace
+        // whatever we had (declaration or definition) with the definition.
+        if (!P.second && !Ty->isForwardDecl())
+          P.first->second = Ty;
+      }
+    }
+  }
+  return Map;
+}
+
+//===----------------------------------------------------------------------===//
+// DebugInfoFinder implementations.
+//===----------------------------------------------------------------------===//
+
+void DebugInfoFinder::reset() {
+  CUs.clear();
+  SPs.clear();
+  GVs.clear();
+  TYs.clear();
+  Scopes.clear();
+  NodesSeen.clear();
+  TypeIdentifierMap.clear();
+  TypeMapInitialized = false;
+}
+
+void DebugInfoFinder::InitializeTypeMap(const Module &M) {
+  if (!TypeMapInitialized)
+    if (NamedMDNode *CU_Nodes = M.getNamedMetadata("llvm.dbg.cu")) {
+      TypeIdentifierMap = generateDITypeIdentifierMap(CU_Nodes);
+      TypeMapInitialized = true;
+    }
+}
+
+void DebugInfoFinder::processModule(const Module &M) {
+  InitializeTypeMap(M);
+  if (NamedMDNode *CU_Nodes = M.getNamedMetadata("llvm.dbg.cu")) {
+    for (unsigned i = 0, e = CU_Nodes->getNumOperands(); i != e; ++i) {
+      auto *CU = cast<DICompileUnit>(CU_Nodes->getOperand(i));
+      addCompileUnit(CU);
+      for (auto *DIG : CU->getGlobalVariables()) {
+        if (addGlobalVariable(DIG)) {
+          processScope(DIG->getScope());
+          processType(DIG->getType().resolve(TypeIdentifierMap));
+        }
+      }
+      for (auto *SP : CU->getSubprograms())
+        processSubprogram(SP);
+      for (auto *ET : CU->getEnumTypes())
+        processType(ET);
+      for (auto *RT : CU->getRetainedTypes())
+        processType(RT);
+      for (auto *Import : CU->getImportedEntities()) {
+        auto *Entity = Import->getEntity().resolve(TypeIdentifierMap);
+        if (auto *T = dyn_cast<DIType>(Entity))
+          processType(T);
+        else if (auto *SP = dyn_cast<DISubprogram>(Entity))
+          processSubprogram(SP);
+        else if (auto *NS = dyn_cast<DINamespace>(Entity))
+          processScope(NS->getScope());
+        else if (auto *M = dyn_cast<DIModule>(Entity))
+          processScope(M->getScope());
+      }
+    }
+  }
+}
+
+void DebugInfoFinder::processLocation(const Module &M, const DILocation *Loc) {
+  if (!Loc)
+    return;
+  InitializeTypeMap(M);
+  processScope(Loc->getScope());
+  processLocation(M, Loc->getInlinedAt());
+}
+
+void DebugInfoFinder::processType(DIType *DT) {
+  if (!addType(DT))
+    return;
+  processScope(DT->getScope().resolve(TypeIdentifierMap));
+  if (auto *ST = dyn_cast<DISubroutineType>(DT)) {
+    for (DITypeRef Ref : ST->getTypeArray())
+      processType(Ref.resolve(TypeIdentifierMap));
+    return;
+  }
+  if (auto *DCT = dyn_cast<DICompositeType>(DT)) {
+    processType(DCT->getBaseType().resolve(TypeIdentifierMap));
+    for (Metadata *D : DCT->getElements()) {
+      if (auto *T = dyn_cast<DIType>(D))
+        processType(T);
+      else if (auto *SP = dyn_cast<DISubprogram>(D))
+        processSubprogram(SP);
+    }
+    return;
+  }
+  if (auto *DDT = dyn_cast<DIDerivedType>(DT)) {
+    processType(DDT->getBaseType().resolve(TypeIdentifierMap));
+  }
+}
+
+void DebugInfoFinder::processScope(DIScope *Scope) {
+  if (!Scope)
+    return;
+  if (auto *Ty = dyn_cast<DIType>(Scope)) {
+    processType(Ty);
+    return;
+  }
+  if (auto *CU = dyn_cast<DICompileUnit>(Scope)) {
+    addCompileUnit(CU);
+    return;
+  }
+  if (auto *SP = dyn_cast<DISubprogram>(Scope)) {
+    processSubprogram(SP);
+    return;
+  }
+  if (!addScope(Scope))
+    return;
+  if (auto *LB = dyn_cast<DILexicalBlockBase>(Scope)) {
+    processScope(LB->getScope());
+  } else if (auto *NS = dyn_cast<DINamespace>(Scope)) {
+    processScope(NS->getScope());
+  } else if (auto *M = dyn_cast<DIModule>(Scope)) {
+    processScope(M->getScope());
+  }
+}
+
+void DebugInfoFinder::processSubprogram(DISubprogram *SP) {
+  if (!addSubprogram(SP))
+    return;
+  processScope(SP->getScope().resolve(TypeIdentifierMap));
+  processType(SP->getType());
+  for (auto *Element : SP->getTemplateParams()) {
+    if (auto *TType = dyn_cast<DITemplateTypeParameter>(Element)) {
+      processType(TType->getType().resolve(TypeIdentifierMap));
+    } else if (auto *TVal = dyn_cast<DITemplateValueParameter>(Element)) {
+      processType(TVal->getType().resolve(TypeIdentifierMap));
+    }
+  }
+}
+
+void DebugInfoFinder::processDeclare(const Module &M,
+                                     const DbgDeclareInst *DDI) {
+  auto *N = dyn_cast<MDNode>(DDI->getVariable());
+  if (!N)
+    return;
+  InitializeTypeMap(M);
+
+  auto *DV = dyn_cast<DILocalVariable>(N);
+  if (!DV)
+    return;
+
+  if (!NodesSeen.insert(DV).second)
+    return;
+  processScope(DV->getScope());
+  processType(DV->getType().resolve(TypeIdentifierMap));
+}
+
+void DebugInfoFinder::processValue(const Module &M, const DbgValueInst *DVI) {
+  auto *N = dyn_cast<MDNode>(DVI->getVariable());
+  if (!N)
+    return;
+  InitializeTypeMap(M);
+
+  auto *DV = dyn_cast<DILocalVariable>(N);
+  if (!DV)
+    return;
+
+  if (!NodesSeen.insert(DV).second)
+    return;
+  processScope(DV->getScope());
+  processType(DV->getType().resolve(TypeIdentifierMap));
+}
+
+bool DebugInfoFinder::addType(DIType *DT) {
+  if (!DT)
+    return false;
+
+  if (!NodesSeen.insert(DT).second)
+    return false;
+
+  TYs.push_back(const_cast<DIType *>(DT));
+  return true;
+}
+
+bool DebugInfoFinder::addCompileUnit(DICompileUnit *CU) {
+  if (!CU)
+    return false;
+  if (!NodesSeen.insert(CU).second)
+    return false;
+
+  CUs.push_back(CU);
+  return true;
+}
+
+bool DebugInfoFinder::addGlobalVariable(DIGlobalVariable *DIG) {
+  if (!DIG)
+    return false;
+
+  if (!NodesSeen.insert(DIG).second)
+    return false;
+
+  GVs.push_back(DIG);
+  return true;
+}
+
+bool DebugInfoFinder::addSubprogram(DISubprogram *SP) {
+  if (!SP)
+    return false;
+
+  if (!NodesSeen.insert(SP).second)
+    return false;
+
+  SPs.push_back(SP);
+  return true;
+}
+
+bool DebugInfoFinder::addScope(DIScope *Scope) {
+  if (!Scope)
+    return false;
+  // FIXME: Ocaml binding generates a scope with no content, we treat it
+  // as null for now.
+  if (Scope->getNumOperands() == 0)
+    return false;
+  if (!NodesSeen.insert(Scope).second)
+    return false;
+  Scopes.push_back(Scope);
+  return true;
+}
+
+bool llvm::stripDebugInfo(Function &F) {
+  bool Changed = false;
+  if (F.getSubprogram()) {
+    Changed = true;
+    F.setSubprogram(nullptr);
+  }
+  for (BasicBlock &BB : F) {
+    for (Instruction &I : BB) {
+      if (I.getDebugLoc()) {
+        Changed = true;
+        I.setDebugLoc(DebugLoc());
+      }
+    }
+  }
+  return Changed;
+}
+
+bool llvm::StripDebugInfo(Module &M) {
+  bool Changed = false;
+
+  // Remove all of the calls to the debugger intrinsics, and remove them from
+  // the module.
+  if (Function *Declare = M.getFunction("llvm.dbg.declare")) {
+    while (!Declare->use_empty()) {
+      CallInst *CI = cast<CallInst>(Declare->user_back());
+      CI->eraseFromParent();
+    }
+    Declare->eraseFromParent();
+    Changed = true;
+  }
+
+  if (Function *DbgVal = M.getFunction("llvm.dbg.value")) {
+    while (!DbgVal->use_empty()) {
+      CallInst *CI = cast<CallInst>(DbgVal->user_back());
+      CI->eraseFromParent();
+    }
+    DbgVal->eraseFromParent();
+    Changed = true;
+  }
+
+  for (Module::named_metadata_iterator NMI = M.named_metadata_begin(),
+         NME = M.named_metadata_end(); NMI != NME;) {
+    NamedMDNode *NMD = &*NMI;
+    ++NMI;
+    if (NMD->getName().startswith("llvm.dbg.")) {
+      NMD->eraseFromParent();
+      Changed = true;
+    }
+  }
+
+  for (Function &F : M)
+    Changed |= stripDebugInfo(F);
+
+  if (GVMaterializer *Materializer = M.getMaterializer())
+    Materializer->setStripDebugInfo();
+
+  return Changed;
+}
+
+unsigned llvm::getDebugMetadataVersionFromModule(const Module &M) {
+  if (auto *Val = mdconst::dyn_extract_or_null<ConstantInt>(
+          M.getModuleFlag("Debug Info Version")))
+    return Val->getZExtValue();
+  return 0;
+}