Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1972 insertions, 0 deletions

diff --git a/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp b/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp
new file mode 100644
index 000000000..5f5b5de79
--- /dev/null
+++ b/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp
@@ -0,0 +1,1972 @@
+#include "LLVMWrapper.h"
+#include "llvm/IR/DebugInfoMetadata.h"
+#include "llvm/IR/DiagnosticHandler.h"
+#include "llvm/IR/DiagnosticInfo.h"
+#include "llvm/IR/DiagnosticPrinter.h"
+#include "llvm/IR/GlobalVariable.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/IR/Intrinsics.h"
+#include "llvm/IR/IntrinsicsARM.h"
+#include "llvm/IR/Mangler.h"
+#include "llvm/Object/Archive.h"
+#include "llvm/Object/COFFImportFile.h"
+#include "llvm/Object/ObjectFile.h"
+#include "llvm/Pass.h"
+#include "llvm/Bitcode/BitcodeWriterPass.h"
+#include "llvm/Support/Signals.h"
+#include "llvm/ADT/Optional.h"
+
+#include <iostream>
+
+//===----------------------------------------------------------------------===
+//
+// This file defines alternate interfaces to core functions that are more
+// readily callable by Rust's FFI.
+//
+//===----------------------------------------------------------------------===
+
+using namespace llvm;
+using namespace llvm::sys;
+using namespace llvm::object;
+
+// LLVMAtomicOrdering is already an enum - don't create another
+// one.
+static AtomicOrdering fromRust(LLVMAtomicOrdering Ordering) {
+  switch (Ordering) {
+  case LLVMAtomicOrderingNotAtomic:
+    return AtomicOrdering::NotAtomic;
+  case LLVMAtomicOrderingUnordered:
+    return AtomicOrdering::Unordered;
+  case LLVMAtomicOrderingMonotonic:
+    return AtomicOrdering::Monotonic;
+  case LLVMAtomicOrderingAcquire:
+    return AtomicOrdering::Acquire;
+  case LLVMAtomicOrderingRelease:
+    return AtomicOrdering::Release;
+  case LLVMAtomicOrderingAcquireRelease:
+    return AtomicOrdering::AcquireRelease;
+  case LLVMAtomicOrderingSequentiallyConsistent:
+    return AtomicOrdering::SequentiallyConsistent;
+  }
+
+  report_fatal_error("Invalid LLVMAtomicOrdering value!");
+}
+
+static LLVM_THREAD_LOCAL char *LastError;
+
+// Custom error handler for fatal LLVM errors.
+//
+// Notably it exits the process with code 101, unlike LLVM's default of 1.
+static void FatalErrorHandler(void *UserData,
+#if LLVM_VERSION_LT(14, 0)
+                              const std::string& Reason,
+#else
+                              const char* Reason,
+#endif
+                              bool GenCrashDiag) {
+  // Do the same thing that the default error handler does.
+  std::cerr << "LLVM ERROR: " << Reason << std::endl;
+
+  // Since this error handler exits the process, we have to run any cleanup that
+  // LLVM would run after handling the error. This might change with an LLVM
+  // upgrade.
+  sys::RunInterruptHandlers();
+
+  exit(101);
+}
+
+extern "C" void LLVMRustInstallFatalErrorHandler() {
+  install_fatal_error_handler(FatalErrorHandler);
+}
+
+extern "C" void LLVMRustDisableSystemDialogsOnCrash() {
+  sys::DisableSystemDialogsOnCrash();
+}
+
+extern "C" char *LLVMRustGetLastError(void) {
+  char *Ret = LastError;
+  LastError = nullptr;
+  return Ret;
+}
+
+extern "C" void LLVMRustSetLastError(const char *Err) {
+  free((void *)LastError);
+  LastError = strdup(Err);
+}
+
+extern "C" LLVMContextRef LLVMRustContextCreate(bool shouldDiscardNames) {
+  auto ctx = new LLVMContext();
+  ctx->setDiscardValueNames(shouldDiscardNames);
+  return wrap(ctx);
+}
+
+extern "C" void LLVMRustSetNormalizedTarget(LLVMModuleRef M,
+                                            const char *Triple) {
+  unwrap(M)->setTargetTriple(Triple::normalize(Triple));
+}
+
+extern "C" void LLVMRustPrintPassTimings() {
+  raw_fd_ostream OS(2, false); // stderr.
+  TimerGroup::printAll(OS);
+}
+
+extern "C" LLVMValueRef LLVMRustGetNamedValue(LLVMModuleRef M, const char *Name,
+                                              size_t NameLen) {
+  return wrap(unwrap(M)->getNamedValue(StringRef(Name, NameLen)));
+}
+
+extern "C" LLVMValueRef LLVMRustGetOrInsertFunction(LLVMModuleRef M,
+                                                    const char *Name,
+                                                    size_t NameLen,
+                                                    LLVMTypeRef FunctionTy) {
+  return wrap(unwrap(M)
+                  ->getOrInsertFunction(StringRef(Name, NameLen),
+                                        unwrap<FunctionType>(FunctionTy))
+                  .getCallee()
+  );
+}
+
+extern "C" LLVMValueRef
+LLVMRustGetOrInsertGlobal(LLVMModuleRef M, const char *Name, size_t NameLen, LLVMTypeRef Ty) {
+  Module *Mod = unwrap(M);
+  StringRef NameRef(Name, NameLen);
+
+  // We don't use Module::getOrInsertGlobal because that returns a Constant*,
+  // which may either be the real GlobalVariable*, or a constant bitcast of it
+  // if our type doesn't match the original declaration. We always want the
+  // GlobalVariable* so we can access linkage, visibility, etc.
+  GlobalVariable *GV = Mod->getGlobalVariable(NameRef, true);
+  if (!GV)
+    GV = new GlobalVariable(*Mod, unwrap(Ty), false,
+                            GlobalValue::ExternalLinkage, nullptr, NameRef);
+  return wrap(GV);
+}
+
+extern "C" LLVMValueRef
+LLVMRustInsertPrivateGlobal(LLVMModuleRef M, LLVMTypeRef Ty) {
+  return wrap(new GlobalVariable(*unwrap(M),
+                                 unwrap(Ty),
+                                 false,
+                                 GlobalValue::PrivateLinkage,
+                                 nullptr));
+}
+
+extern "C" LLVMTypeRef LLVMRustMetadataTypeInContext(LLVMContextRef C) {
+  return wrap(Type::getMetadataTy(*unwrap(C)));
+}
+
+static Attribute::AttrKind fromRust(LLVMRustAttribute Kind) {
+  switch (Kind) {
+  case AlwaysInline:
+    return Attribute::AlwaysInline;
+  case ByVal:
+    return Attribute::ByVal;
+  case Cold:
+    return Attribute::Cold;
+  case InlineHint:
+    return Attribute::InlineHint;
+  case MinSize:
+    return Attribute::MinSize;
+  case Naked:
+    return Attribute::Naked;
+  case NoAlias:
+    return Attribute::NoAlias;
+  case NoCapture:
+    return Attribute::NoCapture;
+  case NoCfCheck:
+    return Attribute::NoCfCheck;
+  case NoInline:
+    return Attribute::NoInline;
+  case NonNull:
+    return Attribute::NonNull;
+  case NoRedZone:
+    return Attribute::NoRedZone;
+  case NoReturn:
+    return Attribute::NoReturn;
+  case NoUnwind:
+    return Attribute::NoUnwind;
+  case OptimizeForSize:
+    return Attribute::OptimizeForSize;
+  case ReadOnly:
+    return Attribute::ReadOnly;
+  case SExt:
+    return Attribute::SExt;
+  case StructRet:
+    return Attribute::StructRet;
+  case UWTable:
+    return Attribute::UWTable;
+  case ZExt:
+    return Attribute::ZExt;
+  case InReg:
+    return Attribute::InReg;
+  case SanitizeThread:
+    return Attribute::SanitizeThread;
+  case SanitizeAddress:
+    return Attribute::SanitizeAddress;
+  case SanitizeMemory:
+    return Attribute::SanitizeMemory;
+  case NonLazyBind:
+    return Attribute::NonLazyBind;
+  case OptimizeNone:
+    return Attribute::OptimizeNone;
+  case ReturnsTwice:
+    return Attribute::ReturnsTwice;
+  case ReadNone:
+    return Attribute::ReadNone;
+  case InaccessibleMemOnly:
+    return Attribute::InaccessibleMemOnly;
+  case SanitizeHWAddress:
+    return Attribute::SanitizeHWAddress;
+  case WillReturn:
+    return Attribute::WillReturn;
+  case StackProtectReq:
+    return Attribute::StackProtectReq;
+  case StackProtectStrong:
+    return Attribute::StackProtectStrong;
+  case StackProtect:
+    return Attribute::StackProtect;
+  case NoUndef:
+    return Attribute::NoUndef;
+  case SanitizeMemTag:
+    return Attribute::SanitizeMemTag;
+  case ShadowCallStack:
+    return Attribute::ShadowCallStack;
+  case AllocSize:
+    return Attribute::AllocSize;
+#if LLVM_VERSION_GE(15, 0)
+  case AllocatedPointer:
+    return Attribute::AllocatedPointer;
+  case AllocAlign:
+    return Attribute::AllocAlign;
+#endif
+  }
+  report_fatal_error("bad AttributeKind");
+}
+
+template<typename T> static inline void AddAttributes(T *t, unsigned Index,
+                                                      LLVMAttributeRef *Attrs, size_t AttrsLen) {
+  AttributeList PAL = t->getAttributes();
+  AttributeList PALNew;
+#if LLVM_VERSION_LT(14, 0)
+  AttrBuilder B;
+  for (LLVMAttributeRef Attr : makeArrayRef(Attrs, AttrsLen))
+    B.addAttribute(unwrap(Attr));
+  PALNew = PAL.addAttributes(t->getContext(), Index, B);
+#else
+  AttrBuilder B(t->getContext());
+  for (LLVMAttributeRef Attr : makeArrayRef(Attrs, AttrsLen))
+    B.addAttribute(unwrap(Attr));
+  PALNew = PAL.addAttributesAtIndex(t->getContext(), Index, B);
+#endif
+  t->setAttributes(PALNew);
+}
+
+extern "C" void LLVMRustAddFunctionAttributes(LLVMValueRef Fn, unsigned Index,
+                                              LLVMAttributeRef *Attrs, size_t AttrsLen) {
+  Function *F = unwrap<Function>(Fn);
+  AddAttributes(F, Index, Attrs, AttrsLen);
+}
+
+extern "C" void LLVMRustAddCallSiteAttributes(LLVMValueRef Instr, unsigned Index,
+                                              LLVMAttributeRef *Attrs, size_t AttrsLen) {
+  CallBase *Call = unwrap<CallBase>(Instr);
+  AddAttributes(Call, Index, Attrs, AttrsLen);
+}
+
+extern "C" LLVMAttributeRef LLVMRustCreateAttrNoValue(LLVMContextRef C,
+                                                      LLVMRustAttribute RustAttr) {
+  return wrap(Attribute::get(*unwrap(C), fromRust(RustAttr)));
+}
+
+extern "C" LLVMAttributeRef LLVMRustCreateAlignmentAttr(LLVMContextRef C,
+                                                        uint64_t Bytes) {
+  return wrap(Attribute::getWithAlignment(*unwrap(C), llvm::Align(Bytes)));
+}
+
+extern "C" LLVMAttributeRef LLVMRustCreateDereferenceableAttr(LLVMContextRef C,
+                                                              uint64_t Bytes) {
+  return wrap(Attribute::getWithDereferenceableBytes(*unwrap(C), Bytes));
+}
+
+extern "C" LLVMAttributeRef LLVMRustCreateDereferenceableOrNullAttr(LLVMContextRef C,
+                                                                    uint64_t Bytes) {
+  return wrap(Attribute::getWithDereferenceableOrNullBytes(*unwrap(C), Bytes));
+}
+
+extern "C" LLVMAttributeRef LLVMRustCreateByValAttr(LLVMContextRef C, LLVMTypeRef Ty) {
+  return wrap(Attribute::getWithByValType(*unwrap(C), unwrap(Ty)));
+}
+
+extern "C" LLVMAttributeRef LLVMRustCreateStructRetAttr(LLVMContextRef C, LLVMTypeRef Ty) {
+  return wrap(Attribute::getWithStructRetType(*unwrap(C), unwrap(Ty)));
+}
+
+extern "C" LLVMAttributeRef LLVMRustCreateElementTypeAttr(LLVMContextRef C, LLVMTypeRef Ty) {
+#if LLVM_VERSION_GE(15, 0)
+  return wrap(Attribute::get(*unwrap(C), Attribute::ElementType, unwrap(Ty)));
+#else
+  report_fatal_error("Should not be needed on LLVM < 15");
+#endif
+}
+
+extern "C" LLVMAttributeRef LLVMRustCreateUWTableAttr(LLVMContextRef C, bool Async) {
+#if LLVM_VERSION_LT(15, 0)
+  return wrap(Attribute::get(*unwrap(C), Attribute::UWTable));
+#else
+  return wrap(Attribute::getWithUWTableKind(
+      *unwrap(C), Async ? UWTableKind::Async : UWTableKind::Sync));
+#endif
+}
+
+extern "C" LLVMAttributeRef LLVMRustCreateAllocSizeAttr(LLVMContextRef C, uint32_t ElementSizeArg) {
+  return wrap(Attribute::getWithAllocSizeArgs(*unwrap(C), ElementSizeArg, None));
+}
+
+#if LLVM_VERSION_GE(15, 0)
+
+// These values **must** match ffi::AllocKindFlags.
+// It _happens_ to match the LLVM values of llvm::AllocFnKind,
+// but that's happenstance and we do explicit conversions before
+// passing them to LLVM.
+enum class LLVMRustAllocKindFlags : uint64_t {
+  Unknown = 0,
+  Alloc = 1,
+  Realloc = 1 << 1,
+  Free = 1 << 2,
+  Uninitialized = 1 << 3,
+  Zeroed = 1 << 4,
+  Aligned = 1 << 5,
+};
+
+static LLVMRustAllocKindFlags operator&(LLVMRustAllocKindFlags A, LLVMRustAllocKindFlags B) {
+  return static_cast<LLVMRustAllocKindFlags>(static_cast<uint64_t>(A) &
+                                      static_cast<uint64_t>(B));
+}
+
+static bool isSet(LLVMRustAllocKindFlags F) { return F != LLVMRustAllocKindFlags::Unknown; }
+
+static llvm::AllocFnKind allocKindFromRust(LLVMRustAllocKindFlags F) {
+  llvm::AllocFnKind AFK = llvm::AllocFnKind::Unknown;
+  if (isSet(F & LLVMRustAllocKindFlags::Alloc)) {
+    AFK |= llvm::AllocFnKind::Alloc;
+  }
+  if (isSet(F & LLVMRustAllocKindFlags::Realloc)) {
+    AFK |= llvm::AllocFnKind::Realloc;
+  }
+  if (isSet(F & LLVMRustAllocKindFlags::Free)) {
+    AFK |= llvm::AllocFnKind::Free;
+  }
+  if (isSet(F & LLVMRustAllocKindFlags::Uninitialized)) {
+    AFK |= llvm::AllocFnKind::Uninitialized;
+  }
+  if (isSet(F & LLVMRustAllocKindFlags::Zeroed)) {
+    AFK |= llvm::AllocFnKind::Zeroed;
+  }
+  if (isSet(F & LLVMRustAllocKindFlags::Aligned)) {
+    AFK |= llvm::AllocFnKind::Aligned;
+  }
+  return AFK;
+}
+#endif
+
+extern "C" LLVMAttributeRef LLVMRustCreateAllocKindAttr(LLVMContextRef C, uint64_t AllocKindArg) {
+#if LLVM_VERSION_GE(15, 0)
+  return wrap(Attribute::get(*unwrap(C), Attribute::AllocKind,
+      static_cast<uint64_t>(allocKindFromRust(static_cast<LLVMRustAllocKindFlags>(AllocKindArg)))));
+#else
+  report_fatal_error(
+      "allockind attributes are new in LLVM 15 and should not be used on older LLVMs");
+#endif
+}
+
+// Enable a fast-math flag
+//
+// https://llvm.org/docs/LangRef.html#fast-math-flags
+extern "C" void LLVMRustSetFastMath(LLVMValueRef V) {
+  if (auto I = dyn_cast<Instruction>(unwrap<Value>(V))) {
+    I->setFast(true);
+  }
+}
+
+extern "C" LLVMValueRef
+LLVMRustBuildAtomicLoad(LLVMBuilderRef B, LLVMTypeRef Ty, LLVMValueRef Source,
+                        const char *Name, LLVMAtomicOrdering Order) {
+  Value *Ptr = unwrap(Source);
+  LoadInst *LI = unwrap(B)->CreateLoad(unwrap(Ty), Ptr, Name);
+  LI->setAtomic(fromRust(Order));
+  return wrap(LI);
+}
+
+extern "C" LLVMValueRef LLVMRustBuildAtomicStore(LLVMBuilderRef B,
+                                                 LLVMValueRef V,
+                                                 LLVMValueRef Target,
+                                                 LLVMAtomicOrdering Order) {
+  StoreInst *SI = unwrap(B)->CreateStore(unwrap(V), unwrap(Target));
+  SI->setAtomic(fromRust(Order));
+  return wrap(SI);
+}
+
+// FIXME: Use the C-API LLVMBuildAtomicCmpXchg and LLVMSetWeak
+// once we raise our minimum support to LLVM 10.
+extern "C" LLVMValueRef
+LLVMRustBuildAtomicCmpXchg(LLVMBuilderRef B, LLVMValueRef Target,
+                           LLVMValueRef Old, LLVMValueRef Source,
+                           LLVMAtomicOrdering Order,
+                           LLVMAtomicOrdering FailureOrder, LLVMBool Weak) {
+#if LLVM_VERSION_GE(13,0)
+  // Rust probably knows the alignment of the target value and should be able to
+  // specify something more precise than MaybeAlign here. See also
+  // https://reviews.llvm.org/D97224 which may be a useful reference.
+  AtomicCmpXchgInst *ACXI = unwrap(B)->CreateAtomicCmpXchg(
+      unwrap(Target), unwrap(Old), unwrap(Source), llvm::MaybeAlign(), fromRust(Order),
+      fromRust(FailureOrder));
+#else
+  AtomicCmpXchgInst *ACXI = unwrap(B)->CreateAtomicCmpXchg(
+      unwrap(Target), unwrap(Old), unwrap(Source), fromRust(Order),
+      fromRust(FailureOrder));
+#endif
+  ACXI->setWeak(Weak);
+  return wrap(ACXI);
+}
+
+enum class LLVMRustSynchronizationScope {
+  SingleThread,
+  CrossThread,
+};
+
+static SyncScope::ID fromRust(LLVMRustSynchronizationScope Scope) {
+  switch (Scope) {
+  case LLVMRustSynchronizationScope::SingleThread:
+    return SyncScope::SingleThread;
+  case LLVMRustSynchronizationScope::CrossThread:
+    return SyncScope::System;
+  default:
+    report_fatal_error("bad SynchronizationScope.");
+  }
+}
+
+extern "C" LLVMValueRef
+LLVMRustBuildAtomicFence(LLVMBuilderRef B, LLVMAtomicOrdering Order,
+                         LLVMRustSynchronizationScope Scope) {
+  return wrap(unwrap(B)->CreateFence(fromRust(Order), fromRust(Scope)));
+}
+
+enum class LLVMRustAsmDialect {
+  Att,
+  Intel,
+};
+
+static InlineAsm::AsmDialect fromRust(LLVMRustAsmDialect Dialect) {
+  switch (Dialect) {
+  case LLVMRustAsmDialect::Att:
+    return InlineAsm::AD_ATT;
+  case LLVMRustAsmDialect::Intel:
+    return InlineAsm::AD_Intel;
+  default:
+    report_fatal_error("bad AsmDialect.");
+  }
+}
+
+extern "C" LLVMValueRef
+LLVMRustInlineAsm(LLVMTypeRef Ty, char *AsmString, size_t AsmStringLen,
+                  char *Constraints, size_t ConstraintsLen,
+                  LLVMBool HasSideEffects, LLVMBool IsAlignStack,
+                  LLVMRustAsmDialect Dialect, LLVMBool CanThrow) {
+#if LLVM_VERSION_GE(13, 0)
+  return wrap(InlineAsm::get(unwrap<FunctionType>(Ty),
+                             StringRef(AsmString, AsmStringLen),
+                             StringRef(Constraints, ConstraintsLen),
+                             HasSideEffects, IsAlignStack,
+                             fromRust(Dialect), CanThrow));
+#else
+  return wrap(InlineAsm::get(unwrap<FunctionType>(Ty),
+                             StringRef(AsmString, AsmStringLen),
+                             StringRef(Constraints, ConstraintsLen),
+                             HasSideEffects, IsAlignStack,
+                             fromRust(Dialect)));
+#endif
+}
+
+extern "C" bool LLVMRustInlineAsmVerify(LLVMTypeRef Ty, char *Constraints,
+                                        size_t ConstraintsLen) {
+#if LLVM_VERSION_LT(15, 0)
+  return InlineAsm::Verify(unwrap<FunctionType>(Ty),
+                           StringRef(Constraints, ConstraintsLen));
+#else
+  // llvm::Error converts to true if it is an error.
+  return !llvm::errorToBool(InlineAsm::verify(
+      unwrap<FunctionType>(Ty), StringRef(Constraints, ConstraintsLen)));
+#endif
+}
+
+extern "C" void LLVMRustAppendModuleInlineAsm(LLVMModuleRef M, const char *Asm,
+                                              size_t AsmLen) {
+  unwrap(M)->appendModuleInlineAsm(StringRef(Asm, AsmLen));
+}
+
+typedef DIBuilder *LLVMRustDIBuilderRef;
+
+template <typename DIT> DIT *unwrapDIPtr(LLVMMetadataRef Ref) {
+  return (DIT *)(Ref ? unwrap<MDNode>(Ref) : nullptr);
+}
+
+#define DIDescriptor DIScope
+#define DIArray DINodeArray
+#define unwrapDI unwrapDIPtr
+
+// These values **must** match debuginfo::DIFlags! They also *happen*
+// to match LLVM, but that isn't required as we do giant sets of
+// matching below. The value shouldn't be directly passed to LLVM.
+enum class LLVMRustDIFlags : uint32_t {
+  FlagZero = 0,
+  FlagPrivate = 1,
+  FlagProtected = 2,
+  FlagPublic = 3,
+  FlagFwdDecl = (1 << 2),
+  FlagAppleBlock = (1 << 3),
+  FlagBlockByrefStruct = (1 << 4),
+  FlagVirtual = (1 << 5),
+  FlagArtificial = (1 << 6),
+  FlagExplicit = (1 << 7),
+  FlagPrototyped = (1 << 8),
+  FlagObjcClassComplete = (1 << 9),
+  FlagObjectPointer = (1 << 10),
+  FlagVector = (1 << 11),
+  FlagStaticMember = (1 << 12),
+  FlagLValueReference = (1 << 13),
+  FlagRValueReference = (1 << 14),
+  FlagExternalTypeRef = (1 << 15),
+  FlagIntroducedVirtual = (1 << 18),
+  FlagBitField = (1 << 19),
+  FlagNoReturn = (1 << 20),
+  // Do not add values that are not supported by the minimum LLVM
+  // version we support! see llvm/include/llvm/IR/DebugInfoFlags.def
+};
+
+inline LLVMRustDIFlags operator&(LLVMRustDIFlags A, LLVMRustDIFlags B) {
+  return static_cast<LLVMRustDIFlags>(static_cast<uint32_t>(A) &
+                                      static_cast<uint32_t>(B));
+}
+
+inline LLVMRustDIFlags operator|(LLVMRustDIFlags A, LLVMRustDIFlags B) {
+  return static_cast<LLVMRustDIFlags>(static_cast<uint32_t>(A) |
+                                      static_cast<uint32_t>(B));
+}
+
+inline LLVMRustDIFlags &operator|=(LLVMRustDIFlags &A, LLVMRustDIFlags B) {
+  return A = A | B;
+}
+
+inline bool isSet(LLVMRustDIFlags F) { return F != LLVMRustDIFlags::FlagZero; }
+
+inline LLVMRustDIFlags visibility(LLVMRustDIFlags F) {
+  return static_cast<LLVMRustDIFlags>(static_cast<uint32_t>(F) & 0x3);
+}
+
+static DINode::DIFlags fromRust(LLVMRustDIFlags Flags) {
+  DINode::DIFlags Result = DINode::DIFlags::FlagZero;
+
+  switch (visibility(Flags)) {
+  case LLVMRustDIFlags::FlagPrivate:
+    Result |= DINode::DIFlags::FlagPrivate;
+    break;
+  case LLVMRustDIFlags::FlagProtected:
+    Result |= DINode::DIFlags::FlagProtected;
+    break;
+  case LLVMRustDIFlags::FlagPublic:
+    Result |= DINode::DIFlags::FlagPublic;
+    break;
+  default:
+    // The rest are handled below
+    break;
+  }
+
+  if (isSet(Flags & LLVMRustDIFlags::FlagFwdDecl)) {
+    Result |= DINode::DIFlags::FlagFwdDecl;
+  }
+  if (isSet(Flags & LLVMRustDIFlags::FlagAppleBlock)) {
+    Result |= DINode::DIFlags::FlagAppleBlock;
+  }
+  if (isSet(Flags & LLVMRustDIFlags::FlagVirtual)) {
+    Result |= DINode::DIFlags::FlagVirtual;
+  }
+  if (isSet(Flags & LLVMRustDIFlags::FlagArtificial)) {
+    Result |= DINode::DIFlags::FlagArtificial;
+  }
+  if (isSet(Flags & LLVMRustDIFlags::FlagExplicit)) {
+    Result |= DINode::DIFlags::FlagExplicit;
+  }
+  if (isSet(Flags & LLVMRustDIFlags::FlagPrototyped)) {
+    Result |= DINode::DIFlags::FlagPrototyped;
+  }
+  if (isSet(Flags & LLVMRustDIFlags::FlagObjcClassComplete)) {
+    Result |= DINode::DIFlags::FlagObjcClassComplete;
+  }
+  if (isSet(Flags & LLVMRustDIFlags::FlagObjectPointer)) {
+    Result |= DINode::DIFlags::FlagObjectPointer;
+  }
+  if (isSet(Flags & LLVMRustDIFlags::FlagVector)) {
+    Result |= DINode::DIFlags::FlagVector;
+  }
+  if (isSet(Flags & LLVMRustDIFlags::FlagStaticMember)) {
+    Result |= DINode::DIFlags::FlagStaticMember;
+  }
+  if (isSet(Flags & LLVMRustDIFlags::FlagLValueReference)) {
+    Result |= DINode::DIFlags::FlagLValueReference;
+  }
+  if (isSet(Flags & LLVMRustDIFlags::FlagRValueReference)) {
+    Result |= DINode::DIFlags::FlagRValueReference;
+  }
+  if (isSet(Flags & LLVMRustDIFlags::FlagIntroducedVirtual)) {
+    Result |= DINode::DIFlags::FlagIntroducedVirtual;
+  }
+  if (isSet(Flags & LLVMRustDIFlags::FlagBitField)) {
+    Result |= DINode::DIFlags::FlagBitField;
+  }
+  if (isSet(Flags & LLVMRustDIFlags::FlagNoReturn)) {
+    Result |= DINode::DIFlags::FlagNoReturn;
+  }
+
+  return Result;
+}
+
+// These values **must** match debuginfo::DISPFlags! They also *happen*
+// to match LLVM, but that isn't required as we do giant sets of
+// matching below. The value shouldn't be directly passed to LLVM.
+enum class LLVMRustDISPFlags : uint32_t {
+  SPFlagZero = 0,
+  SPFlagVirtual = 1,
+  SPFlagPureVirtual = 2,
+  SPFlagLocalToUnit = (1 << 2),
+  SPFlagDefinition = (1 << 3),
+  SPFlagOptimized = (1 << 4),
+  SPFlagMainSubprogram = (1 << 5),
+  // Do not add values that are not supported by the minimum LLVM
+  // version we support! see llvm/include/llvm/IR/DebugInfoFlags.def
+  // (In LLVM < 8, createFunction supported these as separate bool arguments.)
+};
+
+inline LLVMRustDISPFlags operator&(LLVMRustDISPFlags A, LLVMRustDISPFlags B) {
+  return static_cast<LLVMRustDISPFlags>(static_cast<uint32_t>(A) &
+                                      static_cast<uint32_t>(B));
+}
+
+inline LLVMRustDISPFlags operator|(LLVMRustDISPFlags A, LLVMRustDISPFlags B) {
+  return static_cast<LLVMRustDISPFlags>(static_cast<uint32_t>(A) |
+                                      static_cast<uint32_t>(B));
+}
+
+inline LLVMRustDISPFlags &operator|=(LLVMRustDISPFlags &A, LLVMRustDISPFlags B) {
+  return A = A | B;
+}
+
+inline bool isSet(LLVMRustDISPFlags F) { return F != LLVMRustDISPFlags::SPFlagZero; }
+
+inline LLVMRustDISPFlags virtuality(LLVMRustDISPFlags F) {
+  return static_cast<LLVMRustDISPFlags>(static_cast<uint32_t>(F) & 0x3);
+}
+
+static DISubprogram::DISPFlags fromRust(LLVMRustDISPFlags SPFlags) {
+  DISubprogram::DISPFlags Result = DISubprogram::DISPFlags::SPFlagZero;
+
+  switch (virtuality(SPFlags)) {
+  case LLVMRustDISPFlags::SPFlagVirtual:
+    Result |= DISubprogram::DISPFlags::SPFlagVirtual;
+    break;
+  case LLVMRustDISPFlags::SPFlagPureVirtual:
+    Result |= DISubprogram::DISPFlags::SPFlagPureVirtual;
+    break;
+  default:
+    // The rest are handled below
+    break;
+  }
+
+  if (isSet(SPFlags & LLVMRustDISPFlags::SPFlagLocalToUnit)) {
+    Result |= DISubprogram::DISPFlags::SPFlagLocalToUnit;
+  }
+  if (isSet(SPFlags & LLVMRustDISPFlags::SPFlagDefinition)) {
+    Result |= DISubprogram::DISPFlags::SPFlagDefinition;
+  }
+  if (isSet(SPFlags & LLVMRustDISPFlags::SPFlagOptimized)) {
+    Result |= DISubprogram::DISPFlags::SPFlagOptimized;
+  }
+  if (isSet(SPFlags & LLVMRustDISPFlags::SPFlagMainSubprogram)) {
+    Result |= DISubprogram::DISPFlags::SPFlagMainSubprogram;
+  }
+
+  return Result;
+}
+
+enum class LLVMRustDebugEmissionKind {
+  NoDebug,
+  FullDebug,
+  LineTablesOnly,
+};
+
+static DICompileUnit::DebugEmissionKind fromRust(LLVMRustDebugEmissionKind Kind) {
+  switch (Kind) {
+  case LLVMRustDebugEmissionKind::NoDebug:
+    return DICompileUnit::DebugEmissionKind::NoDebug;
+  case LLVMRustDebugEmissionKind::FullDebug:
+    return DICompileUnit::DebugEmissionKind::FullDebug;
+  case LLVMRustDebugEmissionKind::LineTablesOnly:
+    return DICompileUnit::DebugEmissionKind::LineTablesOnly;
+  default:
+    report_fatal_error("bad DebugEmissionKind.");
+  }
+}
+
+enum class LLVMRustChecksumKind {
+  None,
+  MD5,
+  SHA1,
+  SHA256,
+};
+
+static Optional<DIFile::ChecksumKind> fromRust(LLVMRustChecksumKind Kind) {
+  switch (Kind) {
+  case LLVMRustChecksumKind::None:
+    return None;
+  case LLVMRustChecksumKind::MD5:
+    return DIFile::ChecksumKind::CSK_MD5;
+  case LLVMRustChecksumKind::SHA1:
+    return DIFile::ChecksumKind::CSK_SHA1;
+  case LLVMRustChecksumKind::SHA256:
+    return DIFile::ChecksumKind::CSK_SHA256;
+  default:
+    report_fatal_error("bad ChecksumKind.");
+  }
+}
+
+extern "C" uint32_t LLVMRustDebugMetadataVersion() {
+  return DEBUG_METADATA_VERSION;
+}
+
+extern "C" uint32_t LLVMRustVersionPatch() { return LLVM_VERSION_PATCH; }
+
+extern "C" uint32_t LLVMRustVersionMinor() { return LLVM_VERSION_MINOR; }
+
+extern "C" uint32_t LLVMRustVersionMajor() { return LLVM_VERSION_MAJOR; }
+
+extern "C" void LLVMRustAddModuleFlag(
+    LLVMModuleRef M,
+    Module::ModFlagBehavior MergeBehavior,
+    const char *Name,
+    uint32_t Value) {
+  unwrap(M)->addModuleFlag(MergeBehavior, Name, Value);
+}
+
+extern "C" bool LLVMRustHasModuleFlag(LLVMModuleRef M, const char *Name,
+                                      size_t Len) {
+  return unwrap(M)->getModuleFlag(StringRef(Name, Len)) != nullptr;
+}
+
+extern "C" LLVMValueRef LLVMRustMetadataAsValue(LLVMContextRef C, LLVMMetadataRef MD) {
+  return wrap(MetadataAsValue::get(*unwrap(C), unwrap(MD)));
+}
+
+extern "C" void LLVMRustGlobalAddMetadata(
+    LLVMValueRef Global, unsigned Kind, LLVMMetadataRef MD) {
+  unwrap<GlobalObject>(Global)->addMetadata(Kind, *unwrap<MDNode>(MD));
+}
+
+extern "C" LLVMRustDIBuilderRef LLVMRustDIBuilderCreate(LLVMModuleRef M) {
+  return new DIBuilder(*unwrap(M));
+}
+
+extern "C" void LLVMRustDIBuilderDispose(LLVMRustDIBuilderRef Builder) {
+  delete Builder;
+}
+
+extern "C" void LLVMRustDIBuilderFinalize(LLVMRustDIBuilderRef Builder) {
+  Builder->finalize();
+}
+
+extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateCompileUnit(
+    LLVMRustDIBuilderRef Builder, unsigned Lang, LLVMMetadataRef FileRef,
+    const char *Producer, size_t ProducerLen, bool isOptimized,
+    const char *Flags, unsigned RuntimeVer,
+    const char *SplitName, size_t SplitNameLen,
+    LLVMRustDebugEmissionKind Kind,
+    uint64_t DWOId, bool SplitDebugInlining) {
+  auto *File = unwrapDI<DIFile>(FileRef);
+
+  return wrap(Builder->createCompileUnit(Lang, File, StringRef(Producer, ProducerLen),
+                                         isOptimized, Flags, RuntimeVer,
+                                         StringRef(SplitName, SplitNameLen),
+                                         fromRust(Kind), DWOId, SplitDebugInlining));
+}
+
+extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateFile(
+    LLVMRustDIBuilderRef Builder,
+    const char *Filename, size_t FilenameLen,
+    const char *Directory, size_t DirectoryLen, LLVMRustChecksumKind CSKind,
+    const char *Checksum, size_t ChecksumLen) {
+  Optional<DIFile::ChecksumKind> llvmCSKind = fromRust(CSKind);
+  Optional<DIFile::ChecksumInfo<StringRef>> CSInfo{};
+  if (llvmCSKind)
+    CSInfo.emplace(*llvmCSKind, StringRef{Checksum, ChecksumLen});
+  return wrap(Builder->createFile(StringRef(Filename, FilenameLen),
+                                  StringRef(Directory, DirectoryLen),
+                                  CSInfo));
+}
+
+extern "C" LLVMMetadataRef
+LLVMRustDIBuilderCreateSubroutineType(LLVMRustDIBuilderRef Builder,
+                                      LLVMMetadataRef ParameterTypes) {
+  return wrap(Builder->createSubroutineType(
+      DITypeRefArray(unwrap<MDTuple>(ParameterTypes))));
+}
+
+extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateFunction(
+    LLVMRustDIBuilderRef Builder, LLVMMetadataRef Scope,
+    const char *Name, size_t NameLen,
+    const char *LinkageName, size_t LinkageNameLen,
+    LLVMMetadataRef File, unsigned LineNo,
+    LLVMMetadataRef Ty, unsigned ScopeLine, LLVMRustDIFlags Flags,
+    LLVMRustDISPFlags SPFlags, LLVMValueRef MaybeFn, LLVMMetadataRef TParam,
+    LLVMMetadataRef Decl) {
+  DITemplateParameterArray TParams =
+      DITemplateParameterArray(unwrap<MDTuple>(TParam));
+  DISubprogram::DISPFlags llvmSPFlags = fromRust(SPFlags);
+  DINode::DIFlags llvmFlags = fromRust(Flags);
+  DISubprogram *Sub = Builder->createFunction(
+      unwrapDI<DIScope>(Scope),
+      StringRef(Name, NameLen),
+      StringRef(LinkageName, LinkageNameLen),
+      unwrapDI<DIFile>(File), LineNo,
+      unwrapDI<DISubroutineType>(Ty), ScopeLine, llvmFlags,
+      llvmSPFlags, TParams, unwrapDIPtr<DISubprogram>(Decl));
+  if (MaybeFn)
+    unwrap<Function>(MaybeFn)->setSubprogram(Sub);
+  return wrap(Sub);
+}
+
+extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateBasicType(
+    LLVMRustDIBuilderRef Builder, const char *Name, size_t NameLen,
+    uint64_t SizeInBits, unsigned Encoding) {
+  return wrap(Builder->createBasicType(StringRef(Name, NameLen), SizeInBits, Encoding));
+}
+
+extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateTypedef(
+    LLVMRustDIBuilderRef Builder, LLVMMetadataRef Type, const char *Name, size_t NameLen,
+    LLVMMetadataRef File, unsigned LineNo, LLVMMetadataRef Scope) {
+  return wrap(Builder->createTypedef(
+    unwrap<DIType>(Type), StringRef(Name, NameLen), unwrap<DIFile>(File),
+    LineNo, unwrapDIPtr<DIScope>(Scope)));
+}
+
+extern "C" LLVMMetadataRef LLVMRustDIBuilderCreatePointerType(
+    LLVMRustDIBuilderRef Builder, LLVMMetadataRef PointeeTy,
+    uint64_t SizeInBits, uint32_t AlignInBits, unsigned AddressSpace,
+    const char *Name, size_t NameLen) {
+  return wrap(Builder->createPointerType(unwrapDI<DIType>(PointeeTy),
+                                         SizeInBits, AlignInBits,
+                                         AddressSpace,
+                                         StringRef(Name, NameLen)));
+}
+
+extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateStructType(
+    LLVMRustDIBuilderRef Builder, LLVMMetadataRef Scope,
+    const char *Name, size_t NameLen,
+    LLVMMetadataRef File, unsigned LineNumber, uint64_t SizeInBits,
+    uint32_t AlignInBits, LLVMRustDIFlags Flags,
+    LLVMMetadataRef DerivedFrom, LLVMMetadataRef Elements,
+    unsigned RunTimeLang, LLVMMetadataRef VTableHolder,
+    const char *UniqueId, size_t UniqueIdLen) {
+  return wrap(Builder->createStructType(
+      unwrapDI<DIDescriptor>(Scope), StringRef(Name, NameLen),
+      unwrapDI<DIFile>(File), LineNumber,
+      SizeInBits, AlignInBits, fromRust(Flags), unwrapDI<DIType>(DerivedFrom),
+      DINodeArray(unwrapDI<MDTuple>(Elements)), RunTimeLang,
+      unwrapDI<DIType>(VTableHolder), StringRef(UniqueId, UniqueIdLen)));
+}
+
+extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateVariantPart(
+    LLVMRustDIBuilderRef Builder, LLVMMetadataRef Scope,
+    const char *Name, size_t NameLen,
+    LLVMMetadataRef File, unsigned LineNumber, uint64_t SizeInBits,
+    uint32_t AlignInBits, LLVMRustDIFlags Flags, LLVMMetadataRef Discriminator,
+    LLVMMetadataRef Elements, const char *UniqueId, size_t UniqueIdLen) {
+  return wrap(Builder->createVariantPart(
+      unwrapDI<DIDescriptor>(Scope), StringRef(Name, NameLen),
+      unwrapDI<DIFile>(File), LineNumber,
+      SizeInBits, AlignInBits, fromRust(Flags), unwrapDI<DIDerivedType>(Discriminator),
+      DINodeArray(unwrapDI<MDTuple>(Elements)), StringRef(UniqueId, UniqueIdLen)));
+}
+
+extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateMemberType(
+    LLVMRustDIBuilderRef Builder, LLVMMetadataRef Scope,
+    const char *Name, size_t NameLen,
+    LLVMMetadataRef File, unsigned LineNo, uint64_t SizeInBits,
+    uint32_t AlignInBits, uint64_t OffsetInBits, LLVMRustDIFlags Flags,
+    LLVMMetadataRef Ty) {
+  return wrap(Builder->createMemberType(unwrapDI<DIDescriptor>(Scope),
+                                        StringRef(Name, NameLen),
+                                        unwrapDI<DIFile>(File), LineNo,
+                                        SizeInBits, AlignInBits, OffsetInBits,
+                                        fromRust(Flags), unwrapDI<DIType>(Ty)));
+}
+
+extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateVariantMemberType(
+    LLVMRustDIBuilderRef Builder, LLVMMetadataRef Scope,
+    const char *Name, size_t NameLen, LLVMMetadataRef File, unsigned LineNo,
+    uint64_t SizeInBits, uint32_t AlignInBits, uint64_t OffsetInBits, LLVMValueRef Discriminant,
+    LLVMRustDIFlags Flags, LLVMMetadataRef Ty) {
+  llvm::ConstantInt* D = nullptr;
+  if (Discriminant) {
+    D = unwrap<llvm::ConstantInt>(Discriminant);
+  }
+  return wrap(Builder->createVariantMemberType(unwrapDI<DIDescriptor>(Scope),
+                                               StringRef(Name, NameLen),
+                                               unwrapDI<DIFile>(File), LineNo,
+                                               SizeInBits, AlignInBits, OffsetInBits, D,
+                                               fromRust(Flags), unwrapDI<DIType>(Ty)));
+}
+
+extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateLexicalBlock(
+    LLVMRustDIBuilderRef Builder, LLVMMetadataRef Scope,
+    LLVMMetadataRef File, unsigned Line, unsigned Col) {
+  return wrap(Builder->createLexicalBlock(unwrapDI<DIDescriptor>(Scope),
+                                          unwrapDI<DIFile>(File), Line, Col));
+}
+
+extern "C" LLVMMetadataRef
+LLVMRustDIBuilderCreateLexicalBlockFile(LLVMRustDIBuilderRef Builder,
+                                        LLVMMetadataRef Scope,
+                                        LLVMMetadataRef File) {
+  return wrap(Builder->createLexicalBlockFile(unwrapDI<DIDescriptor>(Scope),
+                                              unwrapDI<DIFile>(File)));
+}
+
+extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateStaticVariable(
+    LLVMRustDIBuilderRef Builder, LLVMMetadataRef Context,
+    const char *Name, size_t NameLen,
+    const char *LinkageName, size_t LinkageNameLen,
+    LLVMMetadataRef File, unsigned LineNo,
+    LLVMMetadataRef Ty, bool IsLocalToUnit, LLVMValueRef V,
+    LLVMMetadataRef Decl = nullptr, uint32_t AlignInBits = 0) {
+  llvm::GlobalVariable *InitVal = cast<llvm::GlobalVariable>(unwrap(V));
+
+  llvm::DIExpression *InitExpr = nullptr;
+  if (llvm::ConstantInt *IntVal = llvm::dyn_cast<llvm::ConstantInt>(InitVal)) {
+    InitExpr = Builder->createConstantValueExpression(
+        IntVal->getValue().getSExtValue());
+  } else if (llvm::ConstantFP *FPVal =
+                 llvm::dyn_cast<llvm::ConstantFP>(InitVal)) {
+    InitExpr = Builder->createConstantValueExpression(
+        FPVal->getValueAPF().bitcastToAPInt().getZExtValue());
+  }
+
+  llvm::DIGlobalVariableExpression *VarExpr = Builder->createGlobalVariableExpression(
+      unwrapDI<DIDescriptor>(Context), StringRef(Name, NameLen),
+      StringRef(LinkageName, LinkageNameLen),
+      unwrapDI<DIFile>(File), LineNo, unwrapDI<DIType>(Ty), IsLocalToUnit,
+      /* isDefined */ true,
+      InitExpr, unwrapDIPtr<MDNode>(Decl),
+      /* templateParams */ nullptr,
+      AlignInBits);
+
+  InitVal->setMetadata("dbg", VarExpr);
+
+  return wrap(VarExpr);
+}
+
+extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateVariable(
+    LLVMRustDIBuilderRef Builder, unsigned Tag, LLVMMetadataRef Scope,
+    const char *Name, size_t NameLen,
+    LLVMMetadataRef File, unsigned LineNo,
+    LLVMMetadataRef Ty, bool AlwaysPreserve, LLVMRustDIFlags Flags,
+    unsigned ArgNo, uint32_t AlignInBits) {
+  if (Tag == 0x100) { // DW_TAG_auto_variable
+    return wrap(Builder->createAutoVariable(
+        unwrapDI<DIDescriptor>(Scope), StringRef(Name, NameLen),
+        unwrapDI<DIFile>(File), LineNo,
+        unwrapDI<DIType>(Ty), AlwaysPreserve, fromRust(Flags), AlignInBits));
+  } else {
+    return wrap(Builder->createParameterVariable(
+        unwrapDI<DIDescriptor>(Scope), StringRef(Name, NameLen), ArgNo,
+        unwrapDI<DIFile>(File), LineNo,
+        unwrapDI<DIType>(Ty), AlwaysPreserve, fromRust(Flags)));
+  }
+}
+
+extern "C" LLVMMetadataRef
+LLVMRustDIBuilderCreateArrayType(LLVMRustDIBuilderRef Builder, uint64_t Size,
+                                 uint32_t AlignInBits, LLVMMetadataRef Ty,
+                                 LLVMMetadataRef Subscripts) {
+  return wrap(
+      Builder->createArrayType(Size, AlignInBits, unwrapDI<DIType>(Ty),
+                               DINodeArray(unwrapDI<MDTuple>(Subscripts))));
+}
+
+extern "C" LLVMMetadataRef
+LLVMRustDIBuilderGetOrCreateSubrange(LLVMRustDIBuilderRef Builder, int64_t Lo,
+                                     int64_t Count) {
+  return wrap(Builder->getOrCreateSubrange(Lo, Count));
+}
+
+extern "C" LLVMMetadataRef
+LLVMRustDIBuilderGetOrCreateArray(LLVMRustDIBuilderRef Builder,
+                                  LLVMMetadataRef *Ptr, unsigned Count) {
+  Metadata **DataValue = unwrap(Ptr);
+  return wrap(
+      Builder->getOrCreateArray(ArrayRef<Metadata *>(DataValue, Count)).get());
+}
+
+extern "C" LLVMValueRef LLVMRustDIBuilderInsertDeclareAtEnd(
+    LLVMRustDIBuilderRef Builder, LLVMValueRef V, LLVMMetadataRef VarInfo,
+    uint64_t *AddrOps, unsigned AddrOpsCount, LLVMMetadataRef DL,
+    LLVMBasicBlockRef InsertAtEnd) {
+  return wrap(Builder->insertDeclare(
+      unwrap(V), unwrap<DILocalVariable>(VarInfo),
+      Builder->createExpression(llvm::ArrayRef<uint64_t>(AddrOps, AddrOpsCount)),
+      DebugLoc(cast<MDNode>(unwrap(DL))),
+      unwrap(InsertAtEnd)));
+}
+
+extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateEnumerator(
+    LLVMRustDIBuilderRef Builder, const char *Name, size_t NameLen,
+    int64_t Value, bool IsUnsigned) {
+  return wrap(Builder->createEnumerator(StringRef(Name, NameLen), Value, IsUnsigned));
+}
+
+extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateEnumerationType(
+    LLVMRustDIBuilderRef Builder, LLVMMetadataRef Scope,
+    const char *Name, size_t NameLen,
+    LLVMMetadataRef File, unsigned LineNumber, uint64_t SizeInBits,
+    uint32_t AlignInBits, LLVMMetadataRef Elements,
+    LLVMMetadataRef ClassTy, bool IsScoped) {
+  return wrap(Builder->createEnumerationType(
+      unwrapDI<DIDescriptor>(Scope), StringRef(Name, NameLen),
+      unwrapDI<DIFile>(File), LineNumber,
+      SizeInBits, AlignInBits, DINodeArray(unwrapDI<MDTuple>(Elements)),
+      unwrapDI<DIType>(ClassTy), "", IsScoped));
+}
+
+extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateUnionType(
+    LLVMRustDIBuilderRef Builder, LLVMMetadataRef Scope,
+    const char *Name, size_t NameLen,
+    LLVMMetadataRef File, unsigned LineNumber, uint64_t SizeInBits,
+    uint32_t AlignInBits, LLVMRustDIFlags Flags, LLVMMetadataRef Elements,
+    unsigned RunTimeLang, const char *UniqueId, size_t UniqueIdLen) {
+  return wrap(Builder->createUnionType(
+      unwrapDI<DIDescriptor>(Scope), StringRef(Name, NameLen), unwrapDI<DIFile>(File),
+      LineNumber, SizeInBits, AlignInBits, fromRust(Flags),
+      DINodeArray(unwrapDI<MDTuple>(Elements)), RunTimeLang,
+      StringRef(UniqueId, UniqueIdLen)));
+}
+
+extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateTemplateTypeParameter(
+    LLVMRustDIBuilderRef Builder, LLVMMetadataRef Scope,
+    const char *Name, size_t NameLen, LLVMMetadataRef Ty) {
+  bool IsDefault = false; // FIXME: should we ever set this true?
+  return wrap(Builder->createTemplateTypeParameter(
+      unwrapDI<DIDescriptor>(Scope), StringRef(Name, NameLen), unwrapDI<DIType>(Ty), IsDefault));
+}
+
+extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateNameSpace(
+    LLVMRustDIBuilderRef Builder, LLVMMetadataRef Scope,
+    const char *Name, size_t NameLen, bool ExportSymbols) {
+  return wrap(Builder->createNameSpace(
+      unwrapDI<DIDescriptor>(Scope), StringRef(Name, NameLen), ExportSymbols
+  ));
+}
+
+extern "C" void
+LLVMRustDICompositeTypeReplaceArrays(LLVMRustDIBuilderRef Builder,
+                                     LLVMMetadataRef CompositeTy,
+                                     LLVMMetadataRef Elements,
+                                     LLVMMetadataRef Params) {
+  DICompositeType *Tmp = unwrapDI<DICompositeType>(CompositeTy);
+  Builder->replaceArrays(Tmp, DINodeArray(unwrap<MDTuple>(Elements)),
+                         DINodeArray(unwrap<MDTuple>(Params)));
+}
+
+extern "C" LLVMMetadataRef
+LLVMRustDIBuilderCreateDebugLocation(unsigned Line, unsigned Column,
+                                     LLVMMetadataRef ScopeRef,
+                                     LLVMMetadataRef InlinedAt) {
+  MDNode *Scope = unwrapDIPtr<MDNode>(ScopeRef);
+  DILocation *Loc = DILocation::get(
+      Scope->getContext(), Line, Column, Scope,
+      unwrapDIPtr<MDNode>(InlinedAt));
+  return wrap(Loc);
+}
+
+extern "C" uint64_t LLVMRustDIBuilderCreateOpDeref() {
+  return dwarf::DW_OP_deref;
+}
+
+extern "C" uint64_t LLVMRustDIBuilderCreateOpPlusUconst() {
+  return dwarf::DW_OP_plus_uconst;
+}
+
+extern "C" void LLVMRustWriteTypeToString(LLVMTypeRef Ty, RustStringRef Str) {
+  RawRustStringOstream OS(Str);
+  unwrap<llvm::Type>(Ty)->print(OS);
+}
+
+extern "C" void LLVMRustWriteValueToString(LLVMValueRef V,
+                                           RustStringRef Str) {
+  RawRustStringOstream OS(Str);
+  if (!V) {
+    OS << "(null)";
+  } else {
+    OS << "(";
+    unwrap<llvm::Value>(V)->getType()->print(OS);
+    OS << ":";
+    unwrap<llvm::Value>(V)->print(OS);
+    OS << ")";
+  }
+}
+
+// LLVMArrayType function does not support 64-bit ElementCount
+extern "C" LLVMTypeRef LLVMRustArrayType(LLVMTypeRef ElementTy,
+                                         uint64_t ElementCount) {
+  return wrap(ArrayType::get(unwrap(ElementTy), ElementCount));
+}
+
+DEFINE_SIMPLE_CONVERSION_FUNCTIONS(Twine, LLVMTwineRef)
+
+extern "C" void LLVMRustWriteTwineToString(LLVMTwineRef T, RustStringRef Str) {
+  RawRustStringOstream OS(Str);
+  unwrap(T)->print(OS);
+}
+
+extern "C" void LLVMRustUnpackOptimizationDiagnostic(
+    LLVMDiagnosticInfoRef DI, RustStringRef PassNameOut,
+    LLVMValueRef *FunctionOut, unsigned* Line, unsigned* Column,
+    RustStringRef FilenameOut, RustStringRef MessageOut) {
+  // Undefined to call this not on an optimization diagnostic!
+  llvm::DiagnosticInfoOptimizationBase *Opt =
+      static_cast<llvm::DiagnosticInfoOptimizationBase *>(unwrap(DI));
+
+  RawRustStringOstream PassNameOS(PassNameOut);
+  PassNameOS << Opt->getPassName();
+  *FunctionOut = wrap(&Opt->getFunction());
+
+  RawRustStringOstream FilenameOS(FilenameOut);
+  DiagnosticLocation loc = Opt->getLocation();
+  if (loc.isValid()) {
+    *Line = loc.getLine();
+    *Column = loc.getColumn();
+    FilenameOS << loc.getAbsolutePath();
+  }
+
+  RawRustStringOstream MessageOS(MessageOut);
+  MessageOS << Opt->getMsg();
+}
+
+enum class LLVMRustDiagnosticLevel {
+    Error,
+    Warning,
+    Note,
+    Remark,
+};
+
+extern "C" void
+LLVMRustUnpackInlineAsmDiagnostic(LLVMDiagnosticInfoRef DI,
+                                  LLVMRustDiagnosticLevel *LevelOut,
+                                  unsigned *CookieOut,
+                                  LLVMTwineRef *MessageOut) {
+  // Undefined to call this not on an inline assembly diagnostic!
+  llvm::DiagnosticInfoInlineAsm *IA =
+      static_cast<llvm::DiagnosticInfoInlineAsm *>(unwrap(DI));
+
+  *CookieOut = IA->getLocCookie();
+  *MessageOut = wrap(&IA->getMsgStr());
+
+  switch (IA->getSeverity()) {
+    case DS_Error:
+      *LevelOut = LLVMRustDiagnosticLevel::Error;
+      break;
+    case DS_Warning:
+      *LevelOut = LLVMRustDiagnosticLevel::Warning;
+      break;
+    case DS_Note:
+      *LevelOut = LLVMRustDiagnosticLevel::Note;
+      break;
+    case DS_Remark:
+      *LevelOut = LLVMRustDiagnosticLevel::Remark;
+      break;
+    default:
+      report_fatal_error("Invalid LLVMRustDiagnosticLevel value!");
+  }
+}
+
+extern "C" void LLVMRustWriteDiagnosticInfoToString(LLVMDiagnosticInfoRef DI,
+                                                    RustStringRef Str) {
+  RawRustStringOstream OS(Str);
+  DiagnosticPrinterRawOStream DP(OS);
+  unwrap(DI)->print(DP);
+}
+
+enum class LLVMRustDiagnosticKind {
+  Other,
+  InlineAsm,
+  StackSize,
+  DebugMetadataVersion,
+  SampleProfile,
+  OptimizationRemark,
+  OptimizationRemarkMissed,
+  OptimizationRemarkAnalysis,
+  OptimizationRemarkAnalysisFPCommute,
+  OptimizationRemarkAnalysisAliasing,
+  OptimizationRemarkOther,
+  OptimizationFailure,
+  PGOProfile,
+  Linker,
+  Unsupported,
+  SrcMgr,
+};
+
+static LLVMRustDiagnosticKind toRust(DiagnosticKind Kind) {
+  switch (Kind) {
+  case DK_InlineAsm:
+    return LLVMRustDiagnosticKind::InlineAsm;
+  case DK_StackSize:
+    return LLVMRustDiagnosticKind::StackSize;
+  case DK_DebugMetadataVersion:
+    return LLVMRustDiagnosticKind::DebugMetadataVersion;
+  case DK_SampleProfile:
+    return LLVMRustDiagnosticKind::SampleProfile;
+  case DK_OptimizationRemark:
+  case DK_MachineOptimizationRemark:
+    return LLVMRustDiagnosticKind::OptimizationRemark;
+  case DK_OptimizationRemarkMissed:
+  case DK_MachineOptimizationRemarkMissed:
+    return LLVMRustDiagnosticKind::OptimizationRemarkMissed;
+  case DK_OptimizationRemarkAnalysis:
+  case DK_MachineOptimizationRemarkAnalysis:
+    return LLVMRustDiagnosticKind::OptimizationRemarkAnalysis;
+  case DK_OptimizationRemarkAnalysisFPCommute:
+    return LLVMRustDiagnosticKind::OptimizationRemarkAnalysisFPCommute;
+  case DK_OptimizationRemarkAnalysisAliasing:
+    return LLVMRustDiagnosticKind::OptimizationRemarkAnalysisAliasing;
+  case DK_PGOProfile:
+    return LLVMRustDiagnosticKind::PGOProfile;
+  case DK_Linker:
+    return LLVMRustDiagnosticKind::Linker;
+  case DK_Unsupported:
+    return LLVMRustDiagnosticKind::Unsupported;
+#if LLVM_VERSION_GE(13, 0)
+  case DK_SrcMgr:
+    return LLVMRustDiagnosticKind::SrcMgr;
+#endif
+  default:
+    return (Kind >= DK_FirstRemark && Kind <= DK_LastRemark)
+               ? LLVMRustDiagnosticKind::OptimizationRemarkOther
+               : LLVMRustDiagnosticKind::Other;
+  }
+}
+
+extern "C" LLVMRustDiagnosticKind
+LLVMRustGetDiagInfoKind(LLVMDiagnosticInfoRef DI) {
+  return toRust((DiagnosticKind)unwrap(DI)->getKind());
+}
+
+// This is kept distinct from LLVMGetTypeKind, because when
+// a new type kind is added, the Rust-side enum must be
+// updated or UB will result.
+extern "C" LLVMTypeKind LLVMRustGetTypeKind(LLVMTypeRef Ty) {
+  switch (unwrap(Ty)->getTypeID()) {
+  case Type::VoidTyID:
+    return LLVMVoidTypeKind;
+  case Type::HalfTyID:
+    return LLVMHalfTypeKind;
+  case Type::FloatTyID:
+    return LLVMFloatTypeKind;
+  case Type::DoubleTyID:
+    return LLVMDoubleTypeKind;
+  case Type::X86_FP80TyID:
+    return LLVMX86_FP80TypeKind;
+  case Type::FP128TyID:
+    return LLVMFP128TypeKind;
+  case Type::PPC_FP128TyID:
+    return LLVMPPC_FP128TypeKind;
+  case Type::LabelTyID:
+    return LLVMLabelTypeKind;
+  case Type::MetadataTyID:
+    return LLVMMetadataTypeKind;
+  case Type::IntegerTyID:
+    return LLVMIntegerTypeKind;
+  case Type::FunctionTyID:
+    return LLVMFunctionTypeKind;
+  case Type::StructTyID:
+    return LLVMStructTypeKind;
+  case Type::ArrayTyID:
+    return LLVMArrayTypeKind;
+  case Type::PointerTyID:
+    return LLVMPointerTypeKind;
+  case Type::FixedVectorTyID:
+    return LLVMVectorTypeKind;
+  case Type::X86_MMXTyID:
+    return LLVMX86_MMXTypeKind;
+  case Type::TokenTyID:
+    return LLVMTokenTypeKind;
+  case Type::ScalableVectorTyID:
+    return LLVMScalableVectorTypeKind;
+  case Type::BFloatTyID:
+    return LLVMBFloatTypeKind;
+  case Type::X86_AMXTyID:
+    return LLVMX86_AMXTypeKind;
+#if LLVM_VERSION_GE(15, 0) && LLVM_VERSION_LT(16, 0)
+  case Type::DXILPointerTyID:
+    report_fatal_error("Rust does not support DirectX typed pointers.");
+    break;
+#endif
+#if LLVM_VERSION_GE(16, 0)
+  case Type::TypedPointerTyID:
+    report_fatal_error("Rust does not support typed pointers.");
+    break;
+#endif
+  }
+  report_fatal_error("Unhandled TypeID.");
+}
+
+DEFINE_SIMPLE_CONVERSION_FUNCTIONS(SMDiagnostic, LLVMSMDiagnosticRef)
+
+#if LLVM_VERSION_LT(13, 0)
+using LLVMInlineAsmDiagHandlerTy = LLVMContext::InlineAsmDiagHandlerTy;
+#else
+using LLVMInlineAsmDiagHandlerTy = void*;
+#endif
+
+extern "C" void LLVMRustSetInlineAsmDiagnosticHandler(
+    LLVMContextRef C, LLVMInlineAsmDiagHandlerTy H, void *CX) {
+  // Diagnostic handlers were unified in LLVM change 5de2d189e6ad, so starting
+  // with LLVM 13 this function is gone.
+#if LLVM_VERSION_LT(13, 0)
+  unwrap(C)->setInlineAsmDiagnosticHandler(H, CX);
+#endif
+}
+
+extern "C" LLVMSMDiagnosticRef LLVMRustGetSMDiagnostic(
+    LLVMDiagnosticInfoRef DI, unsigned *Cookie) {
+#if LLVM_VERSION_GE(13, 0)
+  llvm::DiagnosticInfoSrcMgr *SM = static_cast<llvm::DiagnosticInfoSrcMgr *>(unwrap(DI));
+  *Cookie = SM->getLocCookie();
+  return wrap(&SM->getSMDiag());
+#else
+  report_fatal_error("Shouldn't get called on older versions");
+#endif
+}
+
+extern "C" bool LLVMRustUnpackSMDiagnostic(LLVMSMDiagnosticRef DRef,
+                                           RustStringRef MessageOut,
+                                           RustStringRef BufferOut,
+                                           LLVMRustDiagnosticLevel* LevelOut,
+                                           unsigned* LocOut,
+                                           unsigned* RangesOut,
+                                           size_t* NumRanges) {
+  SMDiagnostic& D = *unwrap(DRef);
+  RawRustStringOstream MessageOS(MessageOut);
+  MessageOS << D.getMessage();
+
+  switch (D.getKind()) {
+    case SourceMgr::DK_Error:
+      *LevelOut = LLVMRustDiagnosticLevel::Error;
+      break;
+    case SourceMgr::DK_Warning:
+      *LevelOut = LLVMRustDiagnosticLevel::Warning;
+      break;
+    case SourceMgr::DK_Note:
+      *LevelOut = LLVMRustDiagnosticLevel::Note;
+      break;
+    case SourceMgr::DK_Remark:
+      *LevelOut = LLVMRustDiagnosticLevel::Remark;
+      break;
+    default:
+      report_fatal_error("Invalid LLVMRustDiagnosticLevel value!");
+  }
+
+  if (D.getLoc() == SMLoc())
+    return false;
+
+  const SourceMgr &LSM = *D.getSourceMgr();
+  const MemoryBuffer *LBuf = LSM.getMemoryBuffer(LSM.FindBufferContainingLoc(D.getLoc()));
+  LLVMRustStringWriteImpl(BufferOut, LBuf->getBufferStart(), LBuf->getBufferSize());
+
+  *LocOut = D.getLoc().getPointer() - LBuf->getBufferStart();
+
+  *NumRanges = std::min(*NumRanges, D.getRanges().size());
+  size_t LineStart = *LocOut - (size_t)D.getColumnNo();
+  for (size_t i = 0; i < *NumRanges; i++) {
+    RangesOut[i * 2] = LineStart + D.getRanges()[i].first;
+    RangesOut[i * 2 + 1] = LineStart + D.getRanges()[i].second;
+  }
+
+  return true;
+}
+
+extern "C" LLVMValueRef LLVMRustBuildCleanupPad(LLVMBuilderRef B,
+                                                LLVMValueRef ParentPad,
+                                                unsigned ArgCount,
+                                                LLVMValueRef *LLArgs,
+                                                const char *Name) {
+  Value **Args = unwrap(LLArgs);
+  if (ParentPad == nullptr) {
+    Type *Ty = Type::getTokenTy(unwrap(B)->getContext());
+    ParentPad = wrap(Constant::getNullValue(Ty));
+  }
+  return wrap(unwrap(B)->CreateCleanupPad(
+      unwrap(ParentPad), ArrayRef<Value *>(Args, ArgCount), Name));
+}
+
+extern "C" LLVMValueRef LLVMRustBuildCleanupRet(LLVMBuilderRef B,
+                                                LLVMValueRef CleanupPad,
+                                                LLVMBasicBlockRef UnwindBB) {
+  CleanupPadInst *Inst = cast<CleanupPadInst>(unwrap(CleanupPad));
+  return wrap(unwrap(B)->CreateCleanupRet(Inst, unwrap(UnwindBB)));
+}
+
+extern "C" LLVMValueRef
+LLVMRustBuildCatchPad(LLVMBuilderRef B, LLVMValueRef ParentPad,
+                      unsigned ArgCount, LLVMValueRef *LLArgs, const char *Name) {
+  Value **Args = unwrap(LLArgs);
+  return wrap(unwrap(B)->CreateCatchPad(
+      unwrap(ParentPad), ArrayRef<Value *>(Args, ArgCount), Name));
+}
+
+extern "C" LLVMValueRef LLVMRustBuildCatchRet(LLVMBuilderRef B,
+                                              LLVMValueRef Pad,
+                                              LLVMBasicBlockRef BB) {
+  return wrap(unwrap(B)->CreateCatchRet(cast<CatchPadInst>(unwrap(Pad)),
+                                              unwrap(BB)));
+}
+
+extern "C" LLVMValueRef LLVMRustBuildCatchSwitch(LLVMBuilderRef B,
+                                                 LLVMValueRef ParentPad,
+                                                 LLVMBasicBlockRef BB,
+                                                 unsigned NumHandlers,
+                                                 const char *Name) {
+  if (ParentPad == nullptr) {
+    Type *Ty = Type::getTokenTy(unwrap(B)->getContext());
+    ParentPad = wrap(Constant::getNullValue(Ty));
+  }
+  return wrap(unwrap(B)->CreateCatchSwitch(unwrap(ParentPad), unwrap(BB),
+                                                 NumHandlers, Name));
+}
+
+extern "C" void LLVMRustAddHandler(LLVMValueRef CatchSwitchRef,
+                                   LLVMBasicBlockRef Handler) {
+  Value *CatchSwitch = unwrap(CatchSwitchRef);
+  cast<CatchSwitchInst>(CatchSwitch)->addHandler(unwrap(Handler));
+}
+
+extern "C" OperandBundleDef *LLVMRustBuildOperandBundleDef(const char *Name,
+                                                           LLVMValueRef *Inputs,
+                                                           unsigned NumInputs) {
+  return new OperandBundleDef(Name, makeArrayRef(unwrap(Inputs), NumInputs));
+}
+
+extern "C" void LLVMRustFreeOperandBundleDef(OperandBundleDef *Bundle) {
+  delete Bundle;
+}
+
+extern "C" LLVMValueRef LLVMRustBuildCall(LLVMBuilderRef B, LLVMTypeRef Ty, LLVMValueRef Fn,
+                                          LLVMValueRef *Args, unsigned NumArgs,
+                                          OperandBundleDef *Bundle) {
+  Value *Callee = unwrap(Fn);
+  FunctionType *FTy = unwrap<FunctionType>(Ty);
+  unsigned Len = Bundle ? 1 : 0;
+  ArrayRef<OperandBundleDef> Bundles = makeArrayRef(Bundle, Len);
+  return wrap(unwrap(B)->CreateCall(
+      FTy, Callee, makeArrayRef(unwrap(Args), NumArgs), Bundles));
+}
+
+extern "C" LLVMValueRef LLVMRustGetInstrProfIncrementIntrinsic(LLVMModuleRef M) {
+  return wrap(llvm::Intrinsic::getDeclaration(unwrap(M),
+              (llvm::Intrinsic::ID)llvm::Intrinsic::instrprof_increment));
+}
+
+extern "C" LLVMValueRef LLVMRustBuildMemCpy(LLVMBuilderRef B,
+                                            LLVMValueRef Dst, unsigned DstAlign,
+                                            LLVMValueRef Src, unsigned SrcAlign,
+                                            LLVMValueRef Size, bool IsVolatile) {
+  return wrap(unwrap(B)->CreateMemCpy(
+      unwrap(Dst), MaybeAlign(DstAlign),
+      unwrap(Src), MaybeAlign(SrcAlign),
+      unwrap(Size), IsVolatile));
+}
+
+extern "C" LLVMValueRef LLVMRustBuildMemMove(LLVMBuilderRef B,
+                                             LLVMValueRef Dst, unsigned DstAlign,
+                                             LLVMValueRef Src, unsigned SrcAlign,
+                                             LLVMValueRef Size, bool IsVolatile) {
+  return wrap(unwrap(B)->CreateMemMove(
+      unwrap(Dst), MaybeAlign(DstAlign),
+      unwrap(Src), MaybeAlign(SrcAlign),
+      unwrap(Size), IsVolatile));
+}
+
+extern "C" LLVMValueRef LLVMRustBuildMemSet(LLVMBuilderRef B,
+                                            LLVMValueRef Dst, unsigned DstAlign,
+                                            LLVMValueRef Val,
+                                            LLVMValueRef Size, bool IsVolatile) {
+  return wrap(unwrap(B)->CreateMemSet(
+      unwrap(Dst), unwrap(Val), unwrap(Size), MaybeAlign(DstAlign), IsVolatile));
+}
+
+extern "C" LLVMValueRef
+LLVMRustBuildInvoke(LLVMBuilderRef B, LLVMTypeRef Ty, LLVMValueRef Fn,
+                    LLVMValueRef *Args, unsigned NumArgs,
+                    LLVMBasicBlockRef Then, LLVMBasicBlockRef Catch,
+                    OperandBundleDef *Bundle, const char *Name) {
+  Value *Callee = unwrap(Fn);
+  FunctionType *FTy = unwrap<FunctionType>(Ty);
+  unsigned Len = Bundle ? 1 : 0;
+  ArrayRef<OperandBundleDef> Bundles = makeArrayRef(Bundle, Len);
+  return wrap(unwrap(B)->CreateInvoke(FTy, Callee, unwrap(Then), unwrap(Catch),
+                                      makeArrayRef(unwrap(Args), NumArgs),
+                                      Bundles, Name));
+}
+
+extern "C" void LLVMRustPositionBuilderAtStart(LLVMBuilderRef B,
+                                               LLVMBasicBlockRef BB) {
+  auto Point = unwrap(BB)->getFirstInsertionPt();
+  unwrap(B)->SetInsertPoint(unwrap(BB), Point);
+}
+
+extern "C" void LLVMRustSetComdat(LLVMModuleRef M, LLVMValueRef V,
+                                  const char *Name, size_t NameLen) {
+  Triple TargetTriple(unwrap(M)->getTargetTriple());
+  GlobalObject *GV = unwrap<GlobalObject>(V);
+  if (TargetTriple.supportsCOMDAT()) {
+    StringRef NameRef(Name, NameLen);
+    GV->setComdat(unwrap(M)->getOrInsertComdat(NameRef));
+  }
+}
+
+enum class LLVMRustLinkage {
+  ExternalLinkage = 0,
+  AvailableExternallyLinkage = 1,
+  LinkOnceAnyLinkage = 2,
+  LinkOnceODRLinkage = 3,
+  WeakAnyLinkage = 4,
+  WeakODRLinkage = 5,
+  AppendingLinkage = 6,
+  InternalLinkage = 7,
+  PrivateLinkage = 8,
+  ExternalWeakLinkage = 9,
+  CommonLinkage = 10,
+};
+
+static LLVMRustLinkage toRust(LLVMLinkage Linkage) {
+  switch (Linkage) {
+  case LLVMExternalLinkage:
+    return LLVMRustLinkage::ExternalLinkage;
+  case LLVMAvailableExternallyLinkage:
+    return LLVMRustLinkage::AvailableExternallyLinkage;
+  case LLVMLinkOnceAnyLinkage:
+    return LLVMRustLinkage::LinkOnceAnyLinkage;
+  case LLVMLinkOnceODRLinkage:
+    return LLVMRustLinkage::LinkOnceODRLinkage;
+  case LLVMWeakAnyLinkage:
+    return LLVMRustLinkage::WeakAnyLinkage;
+  case LLVMWeakODRLinkage:
+    return LLVMRustLinkage::WeakODRLinkage;
+  case LLVMAppendingLinkage:
+    return LLVMRustLinkage::AppendingLinkage;
+  case LLVMInternalLinkage:
+    return LLVMRustLinkage::InternalLinkage;
+  case LLVMPrivateLinkage:
+    return LLVMRustLinkage::PrivateLinkage;
+  case LLVMExternalWeakLinkage:
+    return LLVMRustLinkage::ExternalWeakLinkage;
+  case LLVMCommonLinkage:
+    return LLVMRustLinkage::CommonLinkage;
+  default:
+    report_fatal_error("Invalid LLVMRustLinkage value!");
+  }
+}
+
+static LLVMLinkage fromRust(LLVMRustLinkage Linkage) {
+  switch (Linkage) {
+  case LLVMRustLinkage::ExternalLinkage:
+    return LLVMExternalLinkage;
+  case LLVMRustLinkage::AvailableExternallyLinkage:
+    return LLVMAvailableExternallyLinkage;
+  case LLVMRustLinkage::LinkOnceAnyLinkage:
+    return LLVMLinkOnceAnyLinkage;
+  case LLVMRustLinkage::LinkOnceODRLinkage:
+    return LLVMLinkOnceODRLinkage;
+  case LLVMRustLinkage::WeakAnyLinkage:
+    return LLVMWeakAnyLinkage;
+  case LLVMRustLinkage::WeakODRLinkage:
+    return LLVMWeakODRLinkage;
+  case LLVMRustLinkage::AppendingLinkage:
+    return LLVMAppendingLinkage;
+  case LLVMRustLinkage::InternalLinkage:
+    return LLVMInternalLinkage;
+  case LLVMRustLinkage::PrivateLinkage:
+    return LLVMPrivateLinkage;
+  case LLVMRustLinkage::ExternalWeakLinkage:
+    return LLVMExternalWeakLinkage;
+  case LLVMRustLinkage::CommonLinkage:
+    return LLVMCommonLinkage;
+  }
+  report_fatal_error("Invalid LLVMRustLinkage value!");
+}
+
+extern "C" LLVMRustLinkage LLVMRustGetLinkage(LLVMValueRef V) {
+  return toRust(LLVMGetLinkage(V));
+}
+
+extern "C" void LLVMRustSetLinkage(LLVMValueRef V,
+                                   LLVMRustLinkage RustLinkage) {
+  LLVMSetLinkage(V, fromRust(RustLinkage));
+}
+
+extern "C" LLVMValueRef LLVMRustConstInBoundsGEP2(LLVMTypeRef Ty,
+                                                  LLVMValueRef ConstantVal,
+                                                  LLVMValueRef *ConstantIndices,
+                                                  unsigned NumIndices) {
+  ArrayRef<Constant *> IdxList(unwrap<Constant>(ConstantIndices, NumIndices),
+                               NumIndices);
+  Constant *Val = unwrap<Constant>(ConstantVal);
+  return wrap(ConstantExpr::getInBoundsGetElementPtr(unwrap(Ty), Val, IdxList));
+}
+
+// Returns true if both high and low were successfully set. Fails in case constant wasn’t any of
+// the common sizes (1, 8, 16, 32, 64, 128 bits)
+extern "C" bool LLVMRustConstInt128Get(LLVMValueRef CV, bool sext, uint64_t *high, uint64_t *low)
+{
+    auto C = unwrap<llvm::ConstantInt>(CV);
+    if (C->getBitWidth() > 128) { return false; }
+    APInt AP;
+#if LLVM_VERSION_GE(15, 0)
+    if (sext) {
+        AP = C->getValue().sext(128);
+    } else {
+        AP = C->getValue().zext(128);
+    }
+#else
+    if (sext) {
+        AP = C->getValue().sextOrSelf(128);
+    } else {
+        AP = C->getValue().zextOrSelf(128);
+    }
+#endif
+    *low = AP.getLoBits(64).getZExtValue();
+    *high = AP.getHiBits(64).getZExtValue();
+    return true;
+}
+
+enum class LLVMRustVisibility {
+  Default = 0,
+  Hidden = 1,
+  Protected = 2,
+};
+
+static LLVMRustVisibility toRust(LLVMVisibility Vis) {
+  switch (Vis) {
+  case LLVMDefaultVisibility:
+    return LLVMRustVisibility::Default;
+  case LLVMHiddenVisibility:
+    return LLVMRustVisibility::Hidden;
+  case LLVMProtectedVisibility:
+    return LLVMRustVisibility::Protected;
+  }
+  report_fatal_error("Invalid LLVMRustVisibility value!");
+}
+
+static LLVMVisibility fromRust(LLVMRustVisibility Vis) {
+  switch (Vis) {
+  case LLVMRustVisibility::Default:
+    return LLVMDefaultVisibility;
+  case LLVMRustVisibility::Hidden:
+    return LLVMHiddenVisibility;
+  case LLVMRustVisibility::Protected:
+    return LLVMProtectedVisibility;
+  }
+  report_fatal_error("Invalid LLVMRustVisibility value!");
+}
+
+extern "C" LLVMRustVisibility LLVMRustGetVisibility(LLVMValueRef V) {
+  return toRust(LLVMGetVisibility(V));
+}
+
+// Oh hey, a binding that makes sense for once? (because LLVM’s own do not)
+extern "C" LLVMValueRef LLVMRustBuildIntCast(LLVMBuilderRef B, LLVMValueRef Val,
+                                             LLVMTypeRef DestTy, bool isSigned) {
+  return wrap(unwrap(B)->CreateIntCast(unwrap(Val), unwrap(DestTy), isSigned, ""));
+}
+
+extern "C" void LLVMRustSetVisibility(LLVMValueRef V,
+                                      LLVMRustVisibility RustVisibility) {
+  LLVMSetVisibility(V, fromRust(RustVisibility));
+}
+
+extern "C" void LLVMRustSetDSOLocal(LLVMValueRef Global, bool is_dso_local) {
+  unwrap<GlobalValue>(Global)->setDSOLocal(is_dso_local);
+}
+
+struct LLVMRustModuleBuffer {
+  std::string data;
+};
+
+extern "C" LLVMRustModuleBuffer*
+LLVMRustModuleBufferCreate(LLVMModuleRef M) {
+  auto Ret = std::make_unique<LLVMRustModuleBuffer>();
+  {
+    raw_string_ostream OS(Ret->data);
+    {
+      legacy::PassManager PM;
+      PM.add(createBitcodeWriterPass(OS));
+      PM.run(*unwrap(M));
+    }
+  }
+  return Ret.release();
+}
+
+extern "C" void
+LLVMRustModuleBufferFree(LLVMRustModuleBuffer *Buffer) {
+  delete Buffer;
+}
+
+extern "C" const void*
+LLVMRustModuleBufferPtr(const LLVMRustModuleBuffer *Buffer) {
+  return Buffer->data.data();
+}
+
+extern "C" size_t
+LLVMRustModuleBufferLen(const LLVMRustModuleBuffer *Buffer) {
+  return Buffer->data.length();
+}
+
+extern "C" uint64_t
+LLVMRustModuleCost(LLVMModuleRef M) {
+  auto f = unwrap(M)->functions();
+  return std::distance(std::begin(f), std::end(f));
+}
+
+// Vector reductions:
+extern "C" LLVMValueRef
+LLVMRustBuildVectorReduceFAdd(LLVMBuilderRef B, LLVMValueRef Acc, LLVMValueRef Src) {
+    return wrap(unwrap(B)->CreateFAddReduce(unwrap(Acc),unwrap(Src)));
+}
+extern "C" LLVMValueRef
+LLVMRustBuildVectorReduceFMul(LLVMBuilderRef B, LLVMValueRef Acc, LLVMValueRef Src) {
+    return wrap(unwrap(B)->CreateFMulReduce(unwrap(Acc),unwrap(Src)));
+}
+extern "C" LLVMValueRef
+LLVMRustBuildVectorReduceAdd(LLVMBuilderRef B, LLVMValueRef Src) {
+    return wrap(unwrap(B)->CreateAddReduce(unwrap(Src)));
+}
+extern "C" LLVMValueRef
+LLVMRustBuildVectorReduceMul(LLVMBuilderRef B, LLVMValueRef Src) {
+    return wrap(unwrap(B)->CreateMulReduce(unwrap(Src)));
+}
+extern "C" LLVMValueRef
+LLVMRustBuildVectorReduceAnd(LLVMBuilderRef B, LLVMValueRef Src) {
+    return wrap(unwrap(B)->CreateAndReduce(unwrap(Src)));
+}
+extern "C" LLVMValueRef
+LLVMRustBuildVectorReduceOr(LLVMBuilderRef B, LLVMValueRef Src) {
+    return wrap(unwrap(B)->CreateOrReduce(unwrap(Src)));
+}
+extern "C" LLVMValueRef
+LLVMRustBuildVectorReduceXor(LLVMBuilderRef B, LLVMValueRef Src) {
+    return wrap(unwrap(B)->CreateXorReduce(unwrap(Src)));
+}
+extern "C" LLVMValueRef
+LLVMRustBuildVectorReduceMin(LLVMBuilderRef B, LLVMValueRef Src, bool IsSigned) {
+    return wrap(unwrap(B)->CreateIntMinReduce(unwrap(Src), IsSigned));
+}
+extern "C" LLVMValueRef
+LLVMRustBuildVectorReduceMax(LLVMBuilderRef B, LLVMValueRef Src, bool IsSigned) {
+    return wrap(unwrap(B)->CreateIntMaxReduce(unwrap(Src), IsSigned));
+}
+extern "C" LLVMValueRef
+LLVMRustBuildVectorReduceFMin(LLVMBuilderRef B, LLVMValueRef Src, bool NoNaN) {
+  Instruction *I = unwrap(B)->CreateFPMinReduce(unwrap(Src));
+  I->setHasNoNaNs(NoNaN);
+  return wrap(I);
+}
+extern "C" LLVMValueRef
+LLVMRustBuildVectorReduceFMax(LLVMBuilderRef B, LLVMValueRef Src, bool NoNaN) {
+  Instruction *I = unwrap(B)->CreateFPMaxReduce(unwrap(Src));
+  I->setHasNoNaNs(NoNaN);
+  return wrap(I);
+}
+
+extern "C" LLVMValueRef
+LLVMRustBuildMinNum(LLVMBuilderRef B, LLVMValueRef LHS, LLVMValueRef RHS) {
+    return wrap(unwrap(B)->CreateMinNum(unwrap(LHS),unwrap(RHS)));
+}
+extern "C" LLVMValueRef
+LLVMRustBuildMaxNum(LLVMBuilderRef B, LLVMValueRef LHS, LLVMValueRef RHS) {
+    return wrap(unwrap(B)->CreateMaxNum(unwrap(LHS),unwrap(RHS)));
+}
+
+// This struct contains all necessary info about a symbol exported from a DLL.
+struct LLVMRustCOFFShortExport {
+  const char* name;
+  bool ordinal_present;
+  // The value of `ordinal` is only meaningful if `ordinal_present` is true.
+  uint16_t ordinal;
+};
+
+// Machine must be a COFF machine type, as defined in PE specs.
+extern "C" LLVMRustResult LLVMRustWriteImportLibrary(
+  const char* ImportName,
+  const char* Path,
+  const LLVMRustCOFFShortExport* Exports,
+  size_t NumExports,
+  uint16_t Machine,
+  bool MinGW)
+{
+  std::vector<llvm::object::COFFShortExport> ConvertedExports;
+  ConvertedExports.reserve(NumExports);
+
+  for (size_t i = 0; i < NumExports; ++i) {
+    bool ordinal_present = Exports[i].ordinal_present;
+    uint16_t ordinal = ordinal_present ? Exports[i].ordinal : 0;
+    ConvertedExports.push_back(llvm::object::COFFShortExport{
+      Exports[i].name,  // Name
+      std::string{},    // ExtName
+      std::string{},    // SymbolName
+      std::string{},    // AliasTarget
+      ordinal,          // Ordinal
+      ordinal_present,  // Noname
+      false,            // Data
+      false,            // Private
+      false             // Constant
+    });
+  }
+
+  auto Error = llvm::object::writeImportLibrary(
+    ImportName,
+    Path,
+    ConvertedExports,
+    static_cast<llvm::COFF::MachineTypes>(Machine),
+    MinGW);
+  if (Error) {
+    std::string errorString;
+    llvm::raw_string_ostream stream(errorString);
+    stream << Error;
+    stream.flush();
+    LLVMRustSetLastError(errorString.c_str());
+    return LLVMRustResult::Failure;
+  } else {
+    return LLVMRustResult::Success;
+  }
+}
+
+// Transfers ownership of DiagnosticHandler unique_ptr to the caller.
+extern "C" DiagnosticHandler *
+LLVMRustContextGetDiagnosticHandler(LLVMContextRef C) {
+  std::unique_ptr<DiagnosticHandler> DH = unwrap(C)->getDiagnosticHandler();
+  return DH.release();
+}
+
+// Sets unique_ptr to object of DiagnosticHandler to provide custom diagnostic
+// handling. Ownership of the handler is moved to the LLVMContext.
+extern "C" void LLVMRustContextSetDiagnosticHandler(LLVMContextRef C,
+                                                    DiagnosticHandler *DH) {
+  unwrap(C)->setDiagnosticHandler(std::unique_ptr<DiagnosticHandler>(DH));
+}
+
+using LLVMDiagnosticHandlerTy = DiagnosticHandler::DiagnosticHandlerTy;
+
+// Configures a diagnostic handler that invokes provided callback when a
+// backend needs to emit a diagnostic.
+//
+// When RemarkAllPasses is true, remarks are enabled for all passes. Otherwise
+// the RemarkPasses array specifies individual passes for which remarks will be
+// enabled.
+extern "C" void LLVMRustContextConfigureDiagnosticHandler(
+    LLVMContextRef C, LLVMDiagnosticHandlerTy DiagnosticHandlerCallback,
+    void *DiagnosticHandlerContext, bool RemarkAllPasses,
+    const char * const * RemarkPasses, size_t RemarkPassesLen) {
+
+  class RustDiagnosticHandler final : public DiagnosticHandler {
+  public:
+    RustDiagnosticHandler(LLVMDiagnosticHandlerTy DiagnosticHandlerCallback,
+                          void *DiagnosticHandlerContext,
+                          bool RemarkAllPasses,
+                          std::vector<std::string> RemarkPasses)
+        : DiagnosticHandlerCallback(DiagnosticHandlerCallback),
+          DiagnosticHandlerContext(DiagnosticHandlerContext),
+          RemarkAllPasses(RemarkAllPasses),
+          RemarkPasses(RemarkPasses) {}
+
+    virtual bool handleDiagnostics(const DiagnosticInfo &DI) override {
+      if (DiagnosticHandlerCallback) {
+        DiagnosticHandlerCallback(DI, DiagnosticHandlerContext);
+        return true;
+      }
+      return false;
+    }
+
+    bool isAnalysisRemarkEnabled(StringRef PassName) const override {
+      return isRemarkEnabled(PassName);
+    }
+
+    bool isMissedOptRemarkEnabled(StringRef PassName) const override {
+      return isRemarkEnabled(PassName);
+    }
+
+    bool isPassedOptRemarkEnabled(StringRef PassName) const override {
+      return isRemarkEnabled(PassName);
+    }
+
+    bool isAnyRemarkEnabled() const override {
+      return RemarkAllPasses || !RemarkPasses.empty();
+    }
+
+  private:
+    bool isRemarkEnabled(StringRef PassName) const {
+      if (RemarkAllPasses)
+        return true;
+
+      for (auto &Pass : RemarkPasses)
+        if (Pass == PassName)
+          return true;
+
+      return false;
+    }
+
+    LLVMDiagnosticHandlerTy DiagnosticHandlerCallback = nullptr;
+    void *DiagnosticHandlerContext = nullptr;
+
+    bool RemarkAllPasses = false;
+    std::vector<std::string> RemarkPasses;
+  };
+
+  std::vector<std::string> Passes;
+  for (size_t I = 0; I != RemarkPassesLen; ++I)
+    Passes.push_back(RemarkPasses[I]);
+
+  unwrap(C)->setDiagnosticHandler(std::make_unique<RustDiagnosticHandler>(
+      DiagnosticHandlerCallback, DiagnosticHandlerContext, RemarkAllPasses, Passes));
+}
+
+extern "C" void LLVMRustGetMangledName(LLVMValueRef V, RustStringRef Str) {
+  RawRustStringOstream OS(Str);
+  GlobalValue *GV = unwrap<GlobalValue>(V);
+  Mangler().getNameWithPrefix(OS, GV, true);
+}
+
+// LLVMGetAggregateElement was added in LLVM 15. For earlier LLVM versions just
+// use its implementation.
+#if LLVM_VERSION_LT(15, 0)
+extern "C" LLVMValueRef LLVMGetAggregateElement(LLVMValueRef C, unsigned Idx) {
+    return wrap(unwrap<Constant>(C)->getAggregateElement(Idx));
+}
+#endif
+
+extern "C" int32_t LLVMRustGetElementTypeArgIndex(LLVMValueRef CallSite) {
+#if LLVM_VERSION_GE(15, 0)
+    auto *CB = unwrap<CallBase>(CallSite);
+    switch (CB->getIntrinsicID()) {
+        case Intrinsic::arm_ldrex:
+            return 0;
+        case Intrinsic::arm_strex:
+            return 1;
+    }
+#endif
+    return -1;
+}