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-rw-r--r--compiler/rustc_llvm/llvm-wrapper/CoverageMappingWrapper.cpp244
-rw-r--r--compiler/rustc_llvm/llvm-wrapper/LLVMWrapper.h103
-rw-r--r--compiler/rustc_llvm/llvm-wrapper/Linker.cpp8
-rw-r--r--compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp462
-rw-r--r--compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp1165
-rw-r--r--compiler/rustc_llvm/llvm-wrapper/SymbolWrapper.cpp4
6 files changed, 886 insertions, 1100 deletions
diff --git a/compiler/rustc_llvm/llvm-wrapper/CoverageMappingWrapper.cpp b/compiler/rustc_llvm/llvm-wrapper/CoverageMappingWrapper.cpp
index cda81d4a9b5..4695de8ea09 100644
--- a/compiler/rustc_llvm/llvm-wrapper/CoverageMappingWrapper.cpp
+++ b/compiler/rustc_llvm/llvm-wrapper/CoverageMappingWrapper.cpp
@@ -1,5 +1,9 @@
 #include "LLVMWrapper.h"
+
 #include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/IR/Module.h"
 #include "llvm/ProfileData/Coverage/CoverageMapping.h"
 #include "llvm/ProfileData/Coverage/CoverageMappingWriter.h"
 #include "llvm/ProfileData/InstrProf.h"
@@ -33,45 +37,6 @@ static coverage::Counter fromRust(LLVMRustCounter Counter) {
   report_fatal_error("Bad LLVMRustCounterKind!");
 }
 
-// FFI equivalent of enum `llvm::coverage::CounterMappingRegion::RegionKind`
-// https://github.com/rust-lang/llvm-project/blob/ea6fa9c2/llvm/include/llvm/ProfileData/Coverage/CoverageMapping.h#L213-L234
-enum class LLVMRustCounterMappingRegionKind {
-  CodeRegion = 0,
-  ExpansionRegion = 1,
-  SkippedRegion = 2,
-  GapRegion = 3,
-  BranchRegion = 4,
-  MCDCDecisionRegion = 5,
-  MCDCBranchRegion = 6
-};
-
-static coverage::CounterMappingRegion::RegionKind
-fromRust(LLVMRustCounterMappingRegionKind Kind) {
-  switch (Kind) {
-  case LLVMRustCounterMappingRegionKind::CodeRegion:
-    return coverage::CounterMappingRegion::CodeRegion;
-  case LLVMRustCounterMappingRegionKind::ExpansionRegion:
-    return coverage::CounterMappingRegion::ExpansionRegion;
-  case LLVMRustCounterMappingRegionKind::SkippedRegion:
-    return coverage::CounterMappingRegion::SkippedRegion;
-  case LLVMRustCounterMappingRegionKind::GapRegion:
-    return coverage::CounterMappingRegion::GapRegion;
-  case LLVMRustCounterMappingRegionKind::BranchRegion:
-    return coverage::CounterMappingRegion::BranchRegion;
-  case LLVMRustCounterMappingRegionKind::MCDCDecisionRegion:
-    return coverage::CounterMappingRegion::MCDCDecisionRegion;
-  case LLVMRustCounterMappingRegionKind::MCDCBranchRegion:
-    return coverage::CounterMappingRegion::MCDCBranchRegion;
-  }
-  report_fatal_error("Bad LLVMRustCounterMappingRegionKind!");
-}
-
-enum LLVMRustMCDCParametersTag {
-  None = 0,
-  Decision = 1,
-  Branch = 2,
-};
-
 struct LLVMRustMCDCDecisionParameters {
   uint32_t BitmapIdx;
   uint16_t NumConditions;
@@ -82,47 +47,63 @@ struct LLVMRustMCDCBranchParameters {
   int16_t ConditionIDs[2];
 };
 
-struct LLVMRustMCDCParameters {
-  LLVMRustMCDCParametersTag Tag;
-  LLVMRustMCDCDecisionParameters DecisionParameters;
-  LLVMRustMCDCBranchParameters BranchParameters;
-};
+static coverage::mcdc::BranchParameters
+fromRust(LLVMRustMCDCBranchParameters Params) {
+  return coverage::mcdc::BranchParameters(
+      Params.ConditionID, {Params.ConditionIDs[0], Params.ConditionIDs[1]});
+}
 
-#if LLVM_VERSION_GE(19, 0)
-static coverage::mcdc::Parameters fromRust(LLVMRustMCDCParameters Params) {
-  switch (Params.Tag) {
-  case LLVMRustMCDCParametersTag::None:
-    return std::monostate();
-  case LLVMRustMCDCParametersTag::Decision:
-    return coverage::mcdc::DecisionParameters(
-        Params.DecisionParameters.BitmapIdx,
-        Params.DecisionParameters.NumConditions);
-  case LLVMRustMCDCParametersTag::Branch:
-    return coverage::mcdc::BranchParameters(
-        static_cast<coverage::mcdc::ConditionID>(
-            Params.BranchParameters.ConditionID),
-        {static_cast<coverage::mcdc::ConditionID>(
-             Params.BranchParameters.ConditionIDs[0]),
-         static_cast<coverage::mcdc::ConditionID>(
-             Params.BranchParameters.ConditionIDs[1])});
-  }
-  report_fatal_error("Bad LLVMRustMCDCParametersTag!");
+static coverage::mcdc::DecisionParameters
+fromRust(LLVMRustMCDCDecisionParameters Params) {
+  return coverage::mcdc::DecisionParameters(Params.BitmapIdx,
+                                            Params.NumConditions);
 }
-#endif
 
-// FFI equivalent of struct `llvm::coverage::CounterMappingRegion`
-// https://github.com/rust-lang/llvm-project/blob/ea6fa9c2/llvm/include/llvm/ProfileData/Coverage/CoverageMapping.h#L211-L304
-struct LLVMRustCounterMappingRegion {
-  LLVMRustCounter Count;
-  LLVMRustCounter FalseCount;
-  LLVMRustMCDCParameters MCDCParameters;
+// Must match the layout of
+// `rustc_codegen_llvm::coverageinfo::ffi::CoverageSpan`.
+struct LLVMRustCoverageSpan {
   uint32_t FileID;
-  uint32_t ExpandedFileID;
   uint32_t LineStart;
   uint32_t ColumnStart;
   uint32_t LineEnd;
   uint32_t ColumnEnd;
-  LLVMRustCounterMappingRegionKind Kind;
+};
+
+// Must match the layout of `rustc_codegen_llvm::coverageinfo::ffi::CodeRegion`.
+struct LLVMRustCoverageCodeRegion {
+  LLVMRustCoverageSpan Span;
+  LLVMRustCounter Count;
+};
+
+// Must match the layout of
+// `rustc_codegen_llvm::coverageinfo::ffi::ExpansionRegion`.
+struct LLVMRustCoverageExpansionRegion {
+  LLVMRustCoverageSpan Span;
+  uint32_t ExpandedFileID;
+};
+
+// Must match the layout of
+// `rustc_codegen_llvm::coverageinfo::ffi::BranchRegion`.
+struct LLVMRustCoverageBranchRegion {
+  LLVMRustCoverageSpan Span;
+  LLVMRustCounter TrueCount;
+  LLVMRustCounter FalseCount;
+};
+
+// Must match the layout of
+// `rustc_codegen_llvm::coverageinfo::ffi::MCDCBranchRegion`.
+struct LLVMRustCoverageMCDCBranchRegion {
+  LLVMRustCoverageSpan Span;
+  LLVMRustCounter TrueCount;
+  LLVMRustCounter FalseCount;
+  LLVMRustMCDCBranchParameters MCDCBranchParams;
+};
+
+// Must match the layout of
+// `rustc_codegen_llvm::coverageinfo::ffi::MCDCDecisionRegion`.
+struct LLVMRustCoverageMCDCDecisionRegion {
+  LLVMRustCoverageSpan Span;
+  LLVMRustMCDCDecisionParameters MCDCDecisionParams;
 };
 
 // FFI equivalent of enum `llvm::coverage::CounterExpression::ExprKind`
@@ -151,13 +132,13 @@ fromRust(LLVMRustCounterExprKind Kind) {
   report_fatal_error("Bad LLVMRustCounterExprKind!");
 }
 
-extern "C" void LLVMRustCoverageWriteFilenamesSectionToBuffer(
+extern "C" void LLVMRustCoverageWriteFilenamesToBuffer(
     const char *const Filenames[], size_t FilenamesLen, // String start pointers
     const size_t *const Lengths, size_t LengthsLen,     // Corresponding lengths
     RustStringRef BufferOut) {
   if (FilenamesLen != LengthsLen) {
     report_fatal_error(
-        "Mismatched lengths in LLVMRustCoverageWriteFilenamesSectionToBuffer");
+        "Mismatched lengths in LLVMRustCoverageWriteFilenamesToBuffer");
   }
 
   SmallVector<std::string, 32> FilenameRefs;
@@ -171,31 +152,20 @@ extern "C" void LLVMRustCoverageWriteFilenamesSectionToBuffer(
   FilenamesWriter.write(OS);
 }
 
-extern "C" void LLVMRustCoverageWriteMappingToBuffer(
-    const unsigned *VirtualFileMappingIDs, unsigned NumVirtualFileMappingIDs,
-    const LLVMRustCounterExpression *RustExpressions, unsigned NumExpressions,
-    const LLVMRustCounterMappingRegion *RustMappingRegions,
-    unsigned NumMappingRegions, RustStringRef BufferOut) {
+extern "C" void LLVMRustCoverageWriteFunctionMappingsToBuffer(
+    const unsigned *VirtualFileMappingIDs, size_t NumVirtualFileMappingIDs,
+    const LLVMRustCounterExpression *RustExpressions, size_t NumExpressions,
+    const LLVMRustCoverageCodeRegion *CodeRegions, size_t NumCodeRegions,
+    const LLVMRustCoverageExpansionRegion *ExpansionRegions,
+    size_t NumExpansionRegions,
+    const LLVMRustCoverageBranchRegion *BranchRegions, size_t NumBranchRegions,
+    const LLVMRustCoverageMCDCBranchRegion *MCDCBranchRegions,
+    size_t NumMCDCBranchRegions,
+    const LLVMRustCoverageMCDCDecisionRegion *MCDCDecisionRegions,
+    size_t NumMCDCDecisionRegions, RustStringRef BufferOut) {
   // Convert from FFI representation to LLVM representation.
-  SmallVector<coverage::CounterMappingRegion, 0> MappingRegions;
-  MappingRegions.reserve(NumMappingRegions);
-  for (const auto &Region : ArrayRef<LLVMRustCounterMappingRegion>(
-           RustMappingRegions, NumMappingRegions)) {
-    MappingRegions.emplace_back(
-        fromRust(Region.Count), fromRust(Region.FalseCount),
-#if LLVM_VERSION_LT(19, 0)
-        coverage::CounterMappingRegion::MCDCParameters{},
-#endif
-        Region.FileID, Region.ExpandedFileID, // File IDs, then region info.
-        Region.LineStart, Region.ColumnStart, Region.LineEnd, Region.ColumnEnd,
-        fromRust(Region.Kind)
-#if LLVM_VERSION_GE(19, 0)
-            ,
-        fromRust(Region.MCDCParameters)
-#endif
-    );
-  }
 
+  // Expressions:
   std::vector<coverage::CounterExpression> Expressions;
   Expressions.reserve(NumExpressions);
   for (const auto &Expression :
@@ -205,6 +175,51 @@ extern "C" void LLVMRustCoverageWriteMappingToBuffer(
                              fromRust(Expression.RHS));
   }
 
+  std::vector<coverage::CounterMappingRegion> MappingRegions;
+  MappingRegions.reserve(NumCodeRegions + NumBranchRegions +
+                         NumMCDCBranchRegions + NumMCDCDecisionRegions);
+
+  // Code regions:
+  for (const auto &Region : ArrayRef(CodeRegions, NumCodeRegions)) {
+    MappingRegions.push_back(coverage::CounterMappingRegion::makeRegion(
+        fromRust(Region.Count), Region.Span.FileID, Region.Span.LineStart,
+        Region.Span.ColumnStart, Region.Span.LineEnd, Region.Span.ColumnEnd));
+  }
+
+  // Expansion regions:
+  for (const auto &Region : ArrayRef(ExpansionRegions, NumExpansionRegions)) {
+    MappingRegions.push_back(coverage::CounterMappingRegion::makeExpansion(
+        Region.Span.FileID, Region.ExpandedFileID, Region.Span.LineStart,
+        Region.Span.ColumnStart, Region.Span.LineEnd, Region.Span.ColumnEnd));
+  }
+
+  // Branch regions:
+  for (const auto &Region : ArrayRef(BranchRegions, NumBranchRegions)) {
+    MappingRegions.push_back(coverage::CounterMappingRegion::makeBranchRegion(
+        fromRust(Region.TrueCount), fromRust(Region.FalseCount),
+        Region.Span.FileID, Region.Span.LineStart, Region.Span.ColumnStart,
+        Region.Span.LineEnd, Region.Span.ColumnEnd));
+  }
+
+  // MC/DC branch regions:
+  for (const auto &Region : ArrayRef(MCDCBranchRegions, NumMCDCBranchRegions)) {
+    MappingRegions.push_back(coverage::CounterMappingRegion::makeBranchRegion(
+        fromRust(Region.TrueCount), fromRust(Region.FalseCount),
+        Region.Span.FileID, Region.Span.LineStart, Region.Span.ColumnStart,
+        Region.Span.LineEnd, Region.Span.ColumnEnd,
+        fromRust(Region.MCDCBranchParams)));
+  }
+
+  // MC/DC decision regions:
+  for (const auto &Region :
+       ArrayRef(MCDCDecisionRegions, NumMCDCDecisionRegions)) {
+    MappingRegions.push_back(coverage::CounterMappingRegion::makeDecisionRegion(
+        fromRust(Region.MCDCDecisionParams), Region.Span.FileID,
+        Region.Span.LineStart, Region.Span.ColumnStart, Region.Span.LineEnd,
+        Region.Span.ColumnEnd));
+  }
+
+  // Write the converted expressions and mappings to a byte buffer.
   auto CoverageMappingWriter = coverage::CoverageMappingWriter(
       ArrayRef<unsigned>(VirtualFileMappingIDs, NumVirtualFileMappingIDs),
       Expressions, MappingRegions);
@@ -219,34 +234,37 @@ LLVMRustCoverageCreatePGOFuncNameVar(LLVMValueRef F, const char *FuncName,
   return wrap(createPGOFuncNameVar(*cast<Function>(unwrap(F)), FuncNameRef));
 }
 
-extern "C" uint64_t LLVMRustCoverageHashByteArray(const char *Bytes,
-                                                  size_t NumBytes) {
-  auto StrRef = StringRef(Bytes, NumBytes);
-  return IndexedInstrProf::ComputeHash(StrRef);
+extern "C" uint64_t LLVMRustCoverageHashBytes(const char *Bytes,
+                                              size_t NumBytes) {
+  return IndexedInstrProf::ComputeHash(StringRef(Bytes, NumBytes));
 }
 
-static void WriteSectionNameToString(LLVMModuleRef M, InstrProfSectKind SK,
-                                     RustStringRef Str) {
+// Private helper function for getting the covmap and covfun section names.
+static void writeInstrProfSectionNameToString(LLVMModuleRef M,
+                                              InstrProfSectKind SectKind,
+                                              RustStringRef OutStr) {
   auto TargetTriple = Triple(unwrap(M)->getTargetTriple());
-  auto name = getInstrProfSectionName(SK, TargetTriple.getObjectFormat());
-  auto OS = RawRustStringOstream(Str);
+  auto name = getInstrProfSectionName(SectKind, TargetTriple.getObjectFormat());
+  auto OS = RawRustStringOstream(OutStr);
   OS << name;
 }
 
-extern "C" void LLVMRustCoverageWriteMapSectionNameToString(LLVMModuleRef M,
-                                                            RustStringRef Str) {
-  WriteSectionNameToString(M, IPSK_covmap, Str);
+extern "C" void
+LLVMRustCoverageWriteCovmapSectionNameToString(LLVMModuleRef M,
+                                               RustStringRef OutStr) {
+  writeInstrProfSectionNameToString(M, IPSK_covmap, OutStr);
 }
 
 extern "C" void
-LLVMRustCoverageWriteFuncSectionNameToString(LLVMModuleRef M,
-                                             RustStringRef Str) {
-  WriteSectionNameToString(M, IPSK_covfun, Str);
+LLVMRustCoverageWriteCovfunSectionNameToString(LLVMModuleRef M,
+                                               RustStringRef OutStr) {
+  writeInstrProfSectionNameToString(M, IPSK_covfun, OutStr);
 }
 
-extern "C" void LLVMRustCoverageWriteMappingVarNameToString(RustStringRef Str) {
+extern "C" void
+LLVMRustCoverageWriteCovmapVarNameToString(RustStringRef OutStr) {
   auto name = getCoverageMappingVarName();
-  auto OS = RawRustStringOstream(Str);
+  auto OS = RawRustStringOstream(OutStr);
   OS << name;
 }
 
diff --git a/compiler/rustc_llvm/llvm-wrapper/LLVMWrapper.h b/compiler/rustc_llvm/llvm-wrapper/LLVMWrapper.h
index 73bbc9de855..f6598f9faf5 100644
--- a/compiler/rustc_llvm/llvm-wrapper/LLVMWrapper.h
+++ b/compiler/rustc_llvm/llvm-wrapper/LLVMWrapper.h
@@ -1,31 +1,12 @@
+#ifndef INCLUDED_RUSTC_LLVM_LLVMWRAPPER_H
+#define INCLUDED_RUSTC_LLVM_LLVMWRAPPER_H
+
 #include "SuppressLLVMWarnings.h"
 
-#include "llvm-c/BitReader.h"
-#include "llvm-c/Core.h"
-#include "llvm-c/Object.h"
-#include "llvm/ADT/ArrayRef.h"
-#include "llvm/ADT/DenseSet.h"
-#include "llvm/ADT/SmallVector.h"
-#include "llvm/Analysis/Lint.h"
-#include "llvm/Analysis/Passes.h"
-#include "llvm/IR/IRBuilder.h"
-#include "llvm/IR/InlineAsm.h"
-#include "llvm/IR/LLVMContext.h"
-#include "llvm/IR/Module.h"
-#include "llvm/Support/CommandLine.h"
-#include "llvm/Support/Debug.h"
-#include "llvm/Support/DynamicLibrary.h"
-#include "llvm/Support/FormattedStream.h"
-#include "llvm/Support/JSON.h"
-#include "llvm/Support/Memory.h"
-#include "llvm/Support/SourceMgr.h"
-#include "llvm/Support/TargetSelect.h"
-#include "llvm/Support/Timer.h"
-#include "llvm/Support/raw_ostream.h"
-#include "llvm/Target/TargetMachine.h"
-#include "llvm/Target/TargetOptions.h"
-#include "llvm/Transforms/IPO.h"
-#include "llvm/Transforms/Scalar.h"
+#include "llvm/Config/llvm-config.h"  // LLVM_VERSION_MAJOR, LLVM_VERSION_MINOR
+#include "llvm/Support/raw_ostream.h" // llvm::raw_ostream
+#include <cstddef>                    // size_t etc
+#include <cstdint>                    // uint64_t etc
 
 #define LLVM_VERSION_GE(major, minor)                                          \
   (LLVM_VERSION_MAJOR > (major) ||                                             \
@@ -33,79 +14,17 @@
 
 #define LLVM_VERSION_LT(major, minor) (!LLVM_VERSION_GE((major), (minor)))
 
-#if LLVM_VERSION_GE(20, 0)
-#include "llvm/Transforms/Utils/Instrumentation.h"
-#else
-#include "llvm/Transforms/Instrumentation.h"
-#endif
-
-#include "llvm/IR/LegacyPassManager.h"
-
-#include "llvm/Bitcode/BitcodeReader.h"
-#include "llvm/Bitcode/BitcodeWriter.h"
-
-#include "llvm/IR/DIBuilder.h"
-#include "llvm/IR/DebugInfo.h"
-#include "llvm/IR/IRPrintingPasses.h"
-#include "llvm/Linker/Linker.h"
-
-#include "llvm/TargetParser/Triple.h"
-
 extern "C" void LLVMRustSetLastError(const char *);
 
 enum class LLVMRustResult { Success, Failure };
 
-enum LLVMRustAttribute {
-  AlwaysInline = 0,
-  ByVal = 1,
-  Cold = 2,
-  InlineHint = 3,
-  MinSize = 4,
-  Naked = 5,
-  NoAlias = 6,
-  NoCapture = 7,
-  NoInline = 8,
-  NonNull = 9,
-  NoRedZone = 10,
-  NoReturn = 11,
-  NoUnwind = 12,
-  OptimizeForSize = 13,
-  ReadOnly = 14,
-  SExt = 15,
-  StructRet = 16,
-  UWTable = 17,
-  ZExt = 18,
-  InReg = 19,
-  SanitizeThread = 20,
-  SanitizeAddress = 21,
-  SanitizeMemory = 22,
-  NonLazyBind = 23,
-  OptimizeNone = 24,
-  ReadNone = 26,
-  SanitizeHWAddress = 28,
-  WillReturn = 29,
-  StackProtectReq = 30,
-  StackProtectStrong = 31,
-  StackProtect = 32,
-  NoUndef = 33,
-  SanitizeMemTag = 34,
-  NoCfCheck = 35,
-  ShadowCallStack = 36,
-  AllocSize = 37,
-  AllocatedPointer = 38,
-  AllocAlign = 39,
-  SanitizeSafeStack = 40,
-  FnRetThunkExtern = 41,
-  Writable = 42,
-  DeadOnUnwind = 43,
-};
-
 typedef struct OpaqueRustString *RustStringRef;
 typedef struct LLVMOpaqueTwine *LLVMTwineRef;
 typedef struct LLVMOpaqueSMDiagnostic *LLVMSMDiagnosticRef;
 
-extern "C" void LLVMRustStringWriteImpl(RustStringRef Str, const char *Ptr,
-                                        size_t Size);
+extern "C" void LLVMRustStringWriteImpl(RustStringRef buf,
+                                        const char *slice_ptr,
+                                        size_t slice_len);
 
 class RawRustStringOstream : public llvm::raw_ostream {
   RustStringRef Str;
@@ -126,3 +45,5 @@ public:
     flush();
   }
 };
+
+#endif // INCLUDED_RUSTC_LLVM_LLVMWRAPPER_H
diff --git a/compiler/rustc_llvm/llvm-wrapper/Linker.cpp b/compiler/rustc_llvm/llvm-wrapper/Linker.cpp
index f43128ed550..fdf54e2d9b4 100644
--- a/compiler/rustc_llvm/llvm-wrapper/Linker.cpp
+++ b/compiler/rustc_llvm/llvm-wrapper/Linker.cpp
@@ -1,8 +1,10 @@
-#include "llvm/Linker/Linker.h"
-#include "SuppressLLVMWarnings.h"
-
 #include "LLVMWrapper.h"
 
+#include "llvm/Bitcode/BitcodeReader.h"
+#include "llvm/IR/Module.h"
+#include "llvm/Linker/Linker.h"
+#include "llvm/Support/MemoryBuffer.h"
+
 using namespace llvm;
 
 struct RustLinker {
diff --git a/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp b/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
index 4b303511dbc..d4a05fbbbc5 100644
--- a/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
+++ b/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
@@ -1,55 +1,54 @@
-#include <stdio.h>
-
-#include <cstddef>
-#include <iomanip>
-#include <set>
-#include <vector>
-
 #include "LLVMWrapper.h"
 
-#include "llvm/Analysis/AliasAnalysis.h"
+#include "llvm-c/Core.h"
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/DenseSet.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/Analysis/Lint.h"
 #include "llvm/Analysis/TargetLibraryInfo.h"
-#include "llvm/Analysis/TargetTransformInfo.h"
 #include "llvm/Bitcode/BitcodeWriter.h"
+#include "llvm/Bitcode/BitcodeWriterPass.h"
 #include "llvm/CodeGen/CommandFlags.h"
-#include "llvm/CodeGen/TargetSubtargetInfo.h"
 #include "llvm/IR/AssemblyAnnotationWriter.h"
 #include "llvm/IR/AutoUpgrade.h"
-#include "llvm/IR/IntrinsicInst.h"
+#include "llvm/IR/LegacyPassManager.h"
+#include "llvm/IR/PassManager.h"
 #include "llvm/IR/Verifier.h"
+#include "llvm/IRPrinter/IRPrintingPasses.h"
 #include "llvm/LTO/LTO.h"
+#include "llvm/MC/MCSubtargetInfo.h"
 #include "llvm/MC/TargetRegistry.h"
-#include "llvm/Object/IRObjectFile.h"
 #include "llvm/Object/ObjectFile.h"
 #include "llvm/Passes/PassBuilder.h"
 #include "llvm/Passes/PassPlugin.h"
 #include "llvm/Passes/StandardInstrumentations.h"
 #include "llvm/Support/CBindingWrapping.h"
 #include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Program.h"
 #include "llvm/Support/TimeProfiler.h"
 #include "llvm/Support/VirtualFileSystem.h"
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/TargetParser/Host.h"
-#include "llvm/Transforms/IPO/AlwaysInliner.h"
 #include "llvm/Transforms/IPO/FunctionImport.h"
 #include "llvm/Transforms/IPO/Internalize.h"
 #include "llvm/Transforms/IPO/LowerTypeTests.h"
 #include "llvm/Transforms/IPO/ThinLTOBitcodeWriter.h"
 #include "llvm/Transforms/Instrumentation/AddressSanitizer.h"
 #include "llvm/Transforms/Instrumentation/DataFlowSanitizer.h"
-#include "llvm/Transforms/Utils/AddDiscriminators.h"
-#include "llvm/Transforms/Utils/FunctionImportUtils.h"
-#if LLVM_VERSION_GE(19, 0)
-#include "llvm/Support/PGOOptions.h"
-#endif
-#include "llvm/Transforms/Instrumentation/GCOVProfiler.h"
 #include "llvm/Transforms/Instrumentation/HWAddressSanitizer.h"
 #include "llvm/Transforms/Instrumentation/InstrProfiling.h"
 #include "llvm/Transforms/Instrumentation/MemorySanitizer.h"
 #include "llvm/Transforms/Instrumentation/ThreadSanitizer.h"
-#include "llvm/Transforms/Utils.h"
+#include "llvm/Transforms/Scalar/AnnotationRemarks.h"
 #include "llvm/Transforms/Utils/CanonicalizeAliases.h"
+#include "llvm/Transforms/Utils/FunctionImportUtils.h"
 #include "llvm/Transforms/Utils/NameAnonGlobals.h"
+#include <set>
+#include <string>
+#include <vector>
+
+// Conditional includes prevent clang-format from fully sorting the list,
+// so if any are needed, keep them separate down here.
 
 using namespace llvm;
 
@@ -196,6 +195,19 @@ extern "C" void LLVMRustTimeTraceProfilerFinish(const char *FileName) {
 GEN_SUBTARGETS
 #undef SUBTARGET
 
+// This struct and various functions are sort of a hack right now, but the
+// problem is that we've got in-memory LLVM modules after we generate and
+// optimize all codegen-units for one compilation in rustc. To be compatible
+// with the LTO support above we need to serialize the modules plus their
+// ThinLTO summary into memory.
+//
+// This structure is basically an owned version of a serialize module, with
+// a ThinLTO summary attached.
+struct LLVMRustThinLTOBuffer {
+  std::string data;
+  std::string thin_link_data;
+};
+
 extern "C" bool LLVMRustHasFeature(LLVMTargetMachineRef TM,
                                    const char *Feature) {
   TargetMachine *Target = unwrap(TM);
@@ -310,6 +322,24 @@ static Reloc::Model fromRust(LLVMRustRelocModel RustReloc) {
   report_fatal_error("Bad RelocModel.");
 }
 
+enum class LLVMRustFloatABI {
+  Default,
+  Soft,
+  Hard,
+};
+
+static FloatABI::ABIType fromRust(LLVMRustFloatABI RustFloatAbi) {
+  switch (RustFloatAbi) {
+  case LLVMRustFloatABI::Default:
+    return FloatABI::Default;
+  case LLVMRustFloatABI::Soft:
+    return FloatABI::Soft;
+  case LLVMRustFloatABI::Hard:
+    return FloatABI::Hard;
+  }
+  report_fatal_error("Bad FloatABI.");
+}
+
 /// getLongestEntryLength - Return the length of the longest entry in the table.
 template <typename KV> static size_t getLongestEntryLength(ArrayRef<KV> Table) {
   size_t MaxLen = 0;
@@ -318,49 +348,17 @@ template <typename KV> static size_t getLongestEntryLength(ArrayRef<KV> Table) {
   return MaxLen;
 }
 
-using PrintBackendInfo = void(void *, const char *Data, size_t Len);
-
 extern "C" void LLVMRustPrintTargetCPUs(LLVMTargetMachineRef TM,
-                                        const char *TargetCPU,
-                                        PrintBackendInfo Print, void *Out) {
-  const TargetMachine *Target = unwrap(TM);
-  const Triple::ArchType HostArch =
-      Triple(sys::getDefaultTargetTriple()).getArch();
-  const Triple::ArchType TargetArch = Target->getTargetTriple().getArch();
+                                        RustStringRef OutStr) {
+  ArrayRef<SubtargetSubTypeKV> CPUTable =
+      unwrap(TM)->getMCSubtargetInfo()->getAllProcessorDescriptions();
+  auto OS = RawRustStringOstream(OutStr);
 
-  std::ostringstream Buf;
-
-  const MCSubtargetInfo *MCInfo = Target->getMCSubtargetInfo();
-  const ArrayRef<SubtargetSubTypeKV> CPUTable =
-      MCInfo->getAllProcessorDescriptions();
-  unsigned MaxCPULen = getLongestEntryLength(CPUTable);
-
-  Buf << "Available CPUs for this target:\n";
-  // Don't print the "native" entry when the user specifies --target with a
-  // different arch since that could be wrong or misleading.
-  if (HostArch == TargetArch) {
-    MaxCPULen = std::max(MaxCPULen, (unsigned)std::strlen("native"));
-    const StringRef HostCPU = sys::getHostCPUName();
-    Buf << "    " << std::left << std::setw(MaxCPULen) << "native"
-        << " - Select the CPU of the current host "
-           "(currently "
-        << HostCPU.str() << ").\n";
-  }
+  // Just print a bare list of target CPU names, and let Rust-side code handle
+  // the full formatting of `--print=target-cpus`.
   for (auto &CPU : CPUTable) {
-    // Compare cpu against current target to label the default
-    if (strcmp(CPU.Key, TargetCPU) == 0) {
-      Buf << "    " << std::left << std::setw(MaxCPULen) << CPU.Key
-          << " - This is the default target CPU for the current build target "
-             "(currently "
-          << Target->getTargetTriple().str() << ").";
-    } else {
-      Buf << "    " << CPU.Key;
-    }
-    Buf << "\n";
+    OS << CPU.Key << "\n";
   }
-
-  const auto &BufString = Buf.str();
-  Print(Out, BufString.data(), BufString.size());
 }
 
 extern "C" size_t LLVMRustGetTargetFeaturesCount(LLVMTargetMachineRef TM) {
@@ -383,16 +381,16 @@ extern "C" void LLVMRustGetTargetFeature(LLVMTargetMachineRef TM, size_t Index,
   *Desc = Feat.Desc;
 }
 
-extern "C" const char *LLVMRustGetHostCPUName(size_t *len) {
+extern "C" const char *LLVMRustGetHostCPUName(size_t *OutLen) {
   StringRef Name = sys::getHostCPUName();
-  *len = Name.size();
+  *OutLen = Name.size();
   return Name.data();
 }
 
 extern "C" LLVMTargetMachineRef LLVMRustCreateTargetMachine(
     const char *TripleStr, const char *CPU, const char *Feature,
     const char *ABIStr, LLVMRustCodeModel RustCM, LLVMRustRelocModel RustReloc,
-    LLVMRustCodeGenOptLevel RustOptLevel, bool UseSoftFloat,
+    LLVMRustCodeGenOptLevel RustOptLevel, LLVMRustFloatABI RustFloatABIType,
     bool FunctionSections, bool DataSections, bool UniqueSectionNames,
     bool TrapUnreachable, bool Singlethread, bool VerboseAsm,
     bool EmitStackSizeSection, bool RelaxELFRelocations, bool UseInitArray,
@@ -403,6 +401,7 @@ extern "C" LLVMTargetMachineRef LLVMRustCreateTargetMachine(
   auto OptLevel = fromRust(RustOptLevel);
   auto RM = fromRust(RustReloc);
   auto CM = fromRust(RustCM);
+  auto FloatABIType = fromRust(RustFloatABIType);
 
   std::string Error;
   auto Trip = Triple(Triple::normalize(TripleStr));
@@ -415,10 +414,7 @@ extern "C" LLVMTargetMachineRef LLVMRustCreateTargetMachine(
 
   TargetOptions Options = codegen::InitTargetOptionsFromCodeGenFlags(Trip);
 
-  Options.FloatABIType = FloatABI::Default;
-  if (UseSoftFloat) {
-    Options.FloatABIType = FloatABI::Soft;
-  }
+  Options.FloatABIType = FloatABIType;
   Options.DataSections = DataSections;
   Options.FunctionSections = FunctionSections;
   Options.UniqueSectionNames = UniqueSectionNames;
@@ -434,31 +430,15 @@ extern "C" LLVMTargetMachineRef LLVMRustCreateTargetMachine(
   }
   if (!strcmp("zlib", DebugInfoCompression) &&
       llvm::compression::zlib::isAvailable()) {
-#if LLVM_VERSION_GE(19, 0)
     Options.MCOptions.CompressDebugSections = DebugCompressionType::Zlib;
-#else
-    Options.CompressDebugSections = DebugCompressionType::Zlib;
-#endif
   } else if (!strcmp("zstd", DebugInfoCompression) &&
              llvm::compression::zstd::isAvailable()) {
-#if LLVM_VERSION_GE(19, 0)
     Options.MCOptions.CompressDebugSections = DebugCompressionType::Zstd;
-#else
-    Options.CompressDebugSections = DebugCompressionType::Zstd;
-#endif
   } else if (!strcmp("none", DebugInfoCompression)) {
-#if LLVM_VERSION_GE(19, 0)
     Options.MCOptions.CompressDebugSections = DebugCompressionType::None;
-#else
-    Options.CompressDebugSections = DebugCompressionType::None;
-#endif
   }
 
-#if LLVM_VERSION_GE(19, 0)
   Options.MCOptions.X86RelaxRelocations = RelaxELFRelocations;
-#else
-  Options.RelaxELFRelocations = RelaxELFRelocations;
-#endif
   Options.UseInitArray = UseInitArray;
   Options.EmulatedTLS = UseEmulatedTls;
 
@@ -486,22 +466,25 @@ extern "C" LLVMTargetMachineRef LLVMRustCreateTargetMachine(
 
   if (ArgsCstrBuff != nullptr) {
 #if LLVM_VERSION_GE(20, 0)
-    int buffer_offset = 0;
+    size_t buffer_offset = 0;
     assert(ArgsCstrBuff[ArgsCstrBuffLen - 1] == '\0');
     auto Arg0 = std::string(ArgsCstrBuff);
     buffer_offset = Arg0.size() + 1;
-    auto ArgsCppStr = std::string(ArgsCstrBuff + buffer_offset,
-                                  ArgsCstrBuffLen - buffer_offset);
-    auto i = 0;
-    while (i != std::string::npos) {
-      i = ArgsCppStr.find('\0', i + 1);
-      if (i != std::string::npos)
-        ArgsCppStr.replace(i, 1, " ");
+
+    std::string CommandlineArgs;
+    raw_string_ostream OS(CommandlineArgs);
+    ListSeparator LS(" ");
+    for (StringRef Arg : split(StringRef(ArgsCstrBuff + buffer_offset,
+                                         ArgsCstrBuffLen - buffer_offset),
+                               '\0')) {
+      OS << LS;
+      sys::printArg(OS, Arg, /*Quote=*/true);
     }
+    OS.flush();
     Options.MCOptions.Argv0 = Arg0;
-    Options.MCOptions.CommandlineArgs = ArgsCppStr;
+    Options.MCOptions.CommandlineArgs = CommandlineArgs;
 #else
-    int buffer_offset = 0;
+    size_t buffer_offset = 0;
     assert(ArgsCstrBuff[ArgsCstrBuffLen - 1] == '\0');
 
     const size_t arg0_len = std::strlen(ArgsCstrBuff);
@@ -510,13 +493,13 @@ extern "C" LLVMTargetMachineRef LLVMRustCreateTargetMachine(
     arg0[arg0_len] = '\0';
     buffer_offset += arg0_len + 1;
 
-    const int num_cmd_arg_strings = std::count(
+    const size_t num_cmd_arg_strings = std::count(
         &ArgsCstrBuff[buffer_offset], &ArgsCstrBuff[ArgsCstrBuffLen], '\0');
 
     std::string *cmd_arg_strings = new std::string[num_cmd_arg_strings];
-    for (int i = 0; i < num_cmd_arg_strings; ++i) {
+    for (size_t i = 0; i < num_cmd_arg_strings; ++i) {
       assert(buffer_offset < ArgsCstrBuffLen);
-      const int len = std::strlen(ArgsCstrBuff + buffer_offset);
+      const size_t len = std::strlen(ArgsCstrBuff + buffer_offset);
       cmd_arg_strings[i] = std::string(&ArgsCstrBuff[buffer_offset], len);
       buffer_offset += len + 1;
     }
@@ -529,8 +512,13 @@ extern "C" LLVMTargetMachineRef LLVMRustCreateTargetMachine(
 #endif
   }
 
+#if LLVM_VERSION_GE(21, 0)
+  TargetMachine *TM = TheTarget->createTargetMachine(Trip, CPU, Feature,
+                                                     Options, RM, CM, OptLevel);
+#else
   TargetMachine *TM = TheTarget->createTargetMachine(
       Trip.getTriple(), CPU, Feature, Options, RM, CM, OptLevel);
+#endif
   return wrap(TM);
 }
 
@@ -586,7 +574,7 @@ static CodeGenFileType fromRust(LLVMRustFileType Type) {
 extern "C" LLVMRustResult
 LLVMRustWriteOutputFile(LLVMTargetMachineRef Target, LLVMPassManagerRef PMR,
                         LLVMModuleRef M, const char *Path, const char *DwoPath,
-                        LLVMRustFileType RustFileType) {
+                        LLVMRustFileType RustFileType, bool VerifyIR) {
   llvm::legacy::PassManager *PM = unwrap<llvm::legacy::PassManager>(PMR);
   auto FileType = fromRust(RustFileType);
 
@@ -611,10 +599,10 @@ LLVMRustWriteOutputFile(LLVMTargetMachineRef Target, LLVMPassManagerRef PMR,
       return LLVMRustResult::Failure;
     }
     auto DBOS = buffer_ostream(DOS);
-    unwrap(Target)->addPassesToEmitFile(*PM, BOS, &DBOS, FileType, false);
+    unwrap(Target)->addPassesToEmitFile(*PM, BOS, &DBOS, FileType, !VerifyIR);
     PM->run(*unwrap(M));
   } else {
-    unwrap(Target)->addPassesToEmitFile(*PM, BOS, nullptr, FileType, false);
+    unwrap(Target)->addPassesToEmitFile(*PM, BOS, nullptr, FileType, !VerifyIR);
     PM->run(*unwrap(M));
   }
 
@@ -706,17 +694,27 @@ struct LLVMRustSanitizerOptions {
   bool SanitizeKernelAddressRecover;
 };
 
+// This symbol won't be available or used when Enzyme is not enabled.
+// Always set AugmentPassBuilder to true, since it registers optimizations which
+// will improve the performance for Enzyme.
+#ifdef ENZYME
+extern "C" void registerEnzymeAndPassPipeline(llvm::PassBuilder &PB,
+                                              /* augmentPassBuilder */ bool);
+#endif
+
 extern "C" LLVMRustResult LLVMRustOptimize(
     LLVMModuleRef ModuleRef, LLVMTargetMachineRef TMRef,
     LLVMRustPassBuilderOptLevel OptLevelRust, LLVMRustOptStage OptStage,
     bool IsLinkerPluginLTO, bool NoPrepopulatePasses, bool VerifyIR,
-    bool LintIR, bool UseThinLTOBuffers, bool MergeFunctions, bool UnrollLoops,
+    bool LintIR, LLVMRustThinLTOBuffer **ThinLTOBufferRef, bool EmitThinLTO,
+    bool EmitThinLTOSummary, bool MergeFunctions, bool UnrollLoops,
     bool SLPVectorize, bool LoopVectorize, bool DisableSimplifyLibCalls,
-    bool EmitLifetimeMarkers, LLVMRustSanitizerOptions *SanitizerOptions,
-    const char *PGOGenPath, const char *PGOUsePath, bool InstrumentCoverage,
-    const char *InstrProfileOutput, bool InstrumentGCOV,
-    const char *PGOSampleUsePath, bool DebugInfoForProfiling,
-    void *LlvmSelfProfiler,
+    bool EmitLifetimeMarkers, bool RunEnzyme, bool PrintBeforeEnzyme,
+    bool PrintAfterEnzyme, bool PrintPasses,
+    LLVMRustSanitizerOptions *SanitizerOptions, const char *PGOGenPath,
+    const char *PGOUsePath, bool InstrumentCoverage,
+    const char *InstrProfileOutput, const char *PGOSampleUsePath,
+    bool DebugInfoForProfiling, void *LlvmSelfProfiler,
     LLVMRustSelfProfileBeforePassCallback BeforePassCallback,
     LLVMRustSelfProfileAfterPassCallback AfterPassCallback,
     const char *ExtraPasses, size_t ExtraPassesLen, const char *LLVMPlugins,
@@ -743,34 +741,23 @@ extern "C" LLVMRustResult LLVMRustOptimize(
   auto FS = vfs::getRealFileSystem();
   if (PGOGenPath) {
     assert(!PGOUsePath && !PGOSampleUsePath);
-    PGOOpt = PGOOptions(PGOGenPath, "", "", "", FS, PGOOptions::IRInstr,
-                        PGOOptions::NoCSAction,
-#if LLVM_VERSION_GE(19, 0)
-                        PGOOptions::ColdFuncOpt::Default,
-#endif
-                        DebugInfoForProfiling);
+    PGOOpt = PGOOptions(
+        PGOGenPath, "", "", "", FS, PGOOptions::IRInstr, PGOOptions::NoCSAction,
+        PGOOptions::ColdFuncOpt::Default, DebugInfoForProfiling);
   } else if (PGOUsePath) {
     assert(!PGOSampleUsePath);
-    PGOOpt = PGOOptions(PGOUsePath, "", "", "", FS, PGOOptions::IRUse,
-                        PGOOptions::NoCSAction,
-#if LLVM_VERSION_GE(19, 0)
-                        PGOOptions::ColdFuncOpt::Default,
-#endif
-                        DebugInfoForProfiling);
+    PGOOpt = PGOOptions(
+        PGOUsePath, "", "", "", FS, PGOOptions::IRUse, PGOOptions::NoCSAction,
+        PGOOptions::ColdFuncOpt::Default, DebugInfoForProfiling);
   } else if (PGOSampleUsePath) {
-    PGOOpt = PGOOptions(PGOSampleUsePath, "", "", "", FS, PGOOptions::SampleUse,
-                        PGOOptions::NoCSAction,
-#if LLVM_VERSION_GE(19, 0)
-                        PGOOptions::ColdFuncOpt::Default,
-#endif
-                        DebugInfoForProfiling);
+    PGOOpt =
+        PGOOptions(PGOSampleUsePath, "", "", "", FS, PGOOptions::SampleUse,
+                   PGOOptions::NoCSAction, PGOOptions::ColdFuncOpt::Default,
+                   DebugInfoForProfiling);
   } else if (DebugInfoForProfiling) {
-    PGOOpt = PGOOptions("", "", "", "", FS, PGOOptions::NoAction,
-                        PGOOptions::NoCSAction,
-#if LLVM_VERSION_GE(19, 0)
-                        PGOOptions::ColdFuncOpt::Default,
-#endif
-                        DebugInfoForProfiling);
+    PGOOpt = PGOOptions(
+        "", "", "", "", FS, PGOOptions::NoAction, PGOOptions::NoCSAction,
+        PGOOptions::ColdFuncOpt::Default, DebugInfoForProfiling);
   }
 
   auto PB = PassBuilder(TM, PTO, PGOOpt, &PIC);
@@ -779,10 +766,8 @@ extern "C" LLVMRustResult LLVMRustOptimize(
   CGSCCAnalysisManager CGAM;
   ModuleAnalysisManager MAM;
 
-  // FIXME: We may want to expose this as an option.
-  bool DebugPassManager = false;
-
-  StandardInstrumentations SI(TheModule->getContext(), DebugPassManager);
+  StandardInstrumentations SI(TheModule->getContext(),
+                              /*DebugLogging=*/false);
   SI.registerCallbacks(PIC, &MAM);
 
   if (LLVMPluginsLen) {
@@ -820,16 +805,22 @@ extern "C" LLVMRustResult LLVMRustOptimize(
   // the PassBuilder does not create a pipeline.
   std::vector<std::function<void(ModulePassManager &, OptimizationLevel)>>
       PipelineStartEPCallbacks;
+#if LLVM_VERSION_GE(20, 0)
+  std::vector<std::function<void(ModulePassManager &, OptimizationLevel,
+                                 ThinOrFullLTOPhase)>>
+      OptimizerLastEPCallbacks;
+#else
   std::vector<std::function<void(ModulePassManager &, OptimizationLevel)>>
       OptimizerLastEPCallbacks;
+#endif
 
   if (!IsLinkerPluginLTO && SanitizerOptions && SanitizerOptions->SanitizeCFI &&
       !NoPrepopulatePasses) {
     PipelineStartEPCallbacks.push_back(
         [](ModulePassManager &MPM, OptimizationLevel Level) {
-          MPM.addPass(LowerTypeTestsPass(/*ExportSummary=*/nullptr,
-                                         /*ImportSummary=*/nullptr,
-                                         /*DropTypeTests=*/false));
+          MPM.addPass(LowerTypeTestsPass(
+              /*ExportSummary=*/nullptr,
+              /*ImportSummary=*/nullptr));
         });
   }
 
@@ -841,17 +832,15 @@ extern "C" LLVMRustResult LLVMRustOptimize(
   }
 
   if (LintIR) {
-    PipelineStartEPCallbacks.push_back(
-        [](ModulePassManager &MPM, OptimizationLevel Level) {
-          MPM.addPass(createModuleToFunctionPassAdaptor(LintPass()));
-        });
-  }
-
-  if (InstrumentGCOV) {
-    PipelineStartEPCallbacks.push_back(
-        [](ModulePassManager &MPM, OptimizationLevel Level) {
-          MPM.addPass(GCOVProfilerPass(GCOVOptions::getDefault()));
-        });
+    PipelineStartEPCallbacks.push_back([](ModulePassManager &MPM,
+                                          OptimizationLevel Level) {
+#if LLVM_VERSION_GE(21, 0)
+      MPM.addPass(
+          createModuleToFunctionPassAdaptor(LintPass(/*AbortOnError=*/true)));
+#else
+      MPM.addPass(createModuleToFunctionPassAdaptor(LintPass()));
+#endif
+    });
   }
 
   if (InstrumentCoverage) {
@@ -875,7 +864,12 @@ extern "C" LLVMRustResult LLVMRustOptimize(
           SanitizerOptions->SanitizeDataFlowABIList +
               SanitizerOptions->SanitizeDataFlowABIListLen);
       OptimizerLastEPCallbacks.push_back(
+#if LLVM_VERSION_GE(20, 0)
+          [ABIListFiles](ModulePassManager &MPM, OptimizationLevel Level,
+                         ThinOrFullLTOPhase phase) {
+#else
           [ABIListFiles](ModulePassManager &MPM, OptimizationLevel Level) {
+#endif
             MPM.addPass(DataFlowSanitizerPass(ABIListFiles));
           });
     }
@@ -887,23 +881,41 @@ extern "C" LLVMRustResult LLVMRustOptimize(
           /*CompileKernel=*/false,
           /*EagerChecks=*/true);
       OptimizerLastEPCallbacks.push_back(
+#if LLVM_VERSION_GE(20, 0)
+          [Options](ModulePassManager &MPM, OptimizationLevel Level,
+                    ThinOrFullLTOPhase phase) {
+#else
           [Options](ModulePassManager &MPM, OptimizationLevel Level) {
+#endif
             MPM.addPass(MemorySanitizerPass(Options));
           });
     }
 
     if (SanitizerOptions->SanitizeThread) {
-      OptimizerLastEPCallbacks.push_back([](ModulePassManager &MPM,
-                                            OptimizationLevel Level) {
-        MPM.addPass(ModuleThreadSanitizerPass());
-        MPM.addPass(createModuleToFunctionPassAdaptor(ThreadSanitizerPass()));
-      });
+      OptimizerLastEPCallbacks.push_back(
+#if LLVM_VERSION_GE(20, 0)
+          [](ModulePassManager &MPM, OptimizationLevel Level,
+             ThinOrFullLTOPhase phase) {
+#else
+          [](ModulePassManager &MPM, OptimizationLevel Level) {
+#endif
+            MPM.addPass(ModuleThreadSanitizerPass());
+            MPM.addPass(
+                createModuleToFunctionPassAdaptor(ThreadSanitizerPass()));
+          });
     }
 
     if (SanitizerOptions->SanitizeAddress ||
         SanitizerOptions->SanitizeKernelAddress) {
       OptimizerLastEPCallbacks.push_back(
-          [SanitizerOptions](ModulePassManager &MPM, OptimizationLevel Level) {
+#if LLVM_VERSION_GE(20, 0)
+          [SanitizerOptions, TM](ModulePassManager &MPM,
+                                 OptimizationLevel Level,
+                                 ThinOrFullLTOPhase phase) {
+#else
+          [SanitizerOptions, TM](ModulePassManager &MPM,
+                                 OptimizationLevel Level) {
+#endif
             auto CompileKernel = SanitizerOptions->SanitizeKernelAddress;
             AddressSanitizerOptions opts = AddressSanitizerOptions{
                 CompileKernel,
@@ -912,12 +924,22 @@ extern "C" LLVMRustResult LLVMRustOptimize(
                 /*UseAfterScope=*/true,
                 AsanDetectStackUseAfterReturnMode::Runtime,
             };
-            MPM.addPass(AddressSanitizerPass(opts));
+            MPM.addPass(AddressSanitizerPass(
+                opts,
+                /*UseGlobalGC*/ true,
+                // UseOdrIndicator should be false on windows machines
+                // https://reviews.llvm.org/D137227
+                !TM->getTargetTriple().isOSWindows()));
           });
     }
     if (SanitizerOptions->SanitizeHWAddress) {
       OptimizerLastEPCallbacks.push_back(
+#if LLVM_VERSION_GE(20, 0)
+          [SanitizerOptions](ModulePassManager &MPM, OptimizationLevel Level,
+                             ThinOrFullLTOPhase phase) {
+#else
           [SanitizerOptions](ModulePassManager &MPM, OptimizationLevel Level) {
+#endif
             HWAddressSanitizerOptions opts(
                 /*CompileKernel=*/false,
                 SanitizerOptions->SanitizeHWAddressRecover,
@@ -928,7 +950,10 @@ extern "C" LLVMRustResult LLVMRustOptimize(
   }
 
   ModulePassManager MPM;
-  bool NeedThinLTOBufferPasses = UseThinLTOBuffers;
+  bool NeedThinLTOBufferPasses = EmitThinLTO;
+  auto ThinLTOBuffer = std::make_unique<LLVMRustThinLTOBuffer>();
+  raw_string_ostream ThinLTODataOS(ThinLTOBuffer->data);
+  raw_string_ostream ThinLinkDataOS(ThinLTOBuffer->thin_link_data);
   if (!NoPrepopulatePasses) {
     // The pre-link pipelines don't support O0 and require using
     // buildO0DefaultPipeline() instead. At the same time, the LTO pipelines do
@@ -941,8 +966,9 @@ extern "C" LLVMRustResult LLVMRustOptimize(
       for (const auto &C : OptimizerLastEPCallbacks)
         PB.registerOptimizerLastEPCallback(C);
 
-      // Pass false as we manually schedule ThinLTOBufferPasses below.
-      MPM = PB.buildO0DefaultPipeline(OptLevel, /* PreLinkLTO */ false);
+      // We manually schedule ThinLTOBufferPasses below, so don't pass the value
+      // to enable it here.
+      MPM = PB.buildO0DefaultPipeline(OptLevel);
     } else {
       for (const auto &C : PipelineStartEPCallbacks)
         PB.registerPipelineStartEPCallback(C);
@@ -951,7 +977,25 @@ extern "C" LLVMRustResult LLVMRustOptimize(
 
       switch (OptStage) {
       case LLVMRustOptStage::PreLinkNoLTO:
-        MPM = PB.buildPerModuleDefaultPipeline(OptLevel, DebugPassManager);
+        if (ThinLTOBufferRef) {
+          // This is similar to LLVM's `buildFatLTODefaultPipeline`, where the
+          // bitcode for embedding is obtained after performing
+          // `ThinLTOPreLinkDefaultPipeline`.
+          MPM.addPass(PB.buildThinLTOPreLinkDefaultPipeline(OptLevel));
+          if (EmitThinLTO) {
+            MPM.addPass(ThinLTOBitcodeWriterPass(
+                ThinLTODataOS, EmitThinLTOSummary ? &ThinLinkDataOS : nullptr));
+          } else {
+            MPM.addPass(BitcodeWriterPass(ThinLTODataOS));
+          }
+          *ThinLTOBufferRef = ThinLTOBuffer.release();
+          MPM.addPass(PB.buildModuleOptimizationPipeline(
+              OptLevel, ThinOrFullLTOPhase::None));
+          MPM.addPass(
+              createModuleToFunctionPassAdaptor(AnnotationRemarksPass()));
+        } else {
+          MPM = PB.buildPerModuleDefaultPipeline(OptLevel);
+        }
         break;
       case LLVMRustOptStage::PreLinkThinLTO:
         MPM = PB.buildThinLTOPreLinkDefaultPipeline(OptLevel);
@@ -977,7 +1021,11 @@ extern "C" LLVMRustResult LLVMRustOptimize(
     for (const auto &C : PipelineStartEPCallbacks)
       C(MPM, OptLevel);
     for (const auto &C : OptimizerLastEPCallbacks)
+#if LLVM_VERSION_GE(20, 0)
+      C(MPM, OptLevel, ThinOrFullLTOPhase::None);
+#else
       C(MPM, OptLevel);
+#endif
   }
 
   if (ExtraPassesLen) {
@@ -993,6 +1041,52 @@ extern "C" LLVMRustResult LLVMRustOptimize(
     MPM.addPass(CanonicalizeAliasesPass());
     MPM.addPass(NameAnonGlobalPass());
   }
+  // For `-Copt-level=0`, ThinLTO, or LTO.
+  if (ThinLTOBufferRef && *ThinLTOBufferRef == nullptr) {
+    if (EmitThinLTO) {
+      MPM.addPass(ThinLTOBitcodeWriterPass(
+          ThinLTODataOS, EmitThinLTOSummary ? &ThinLinkDataOS : nullptr));
+    } else {
+      MPM.addPass(BitcodeWriterPass(ThinLTODataOS));
+    }
+    *ThinLTOBufferRef = ThinLTOBuffer.release();
+  }
+
+  // now load "-enzyme" pass:
+#ifdef ENZYME
+  if (RunEnzyme) {
+
+    if (PrintBeforeEnzyme) {
+      // Handle the Rust flag `-Zautodiff=PrintModBefore`.
+      std::string Banner = "Module before EnzymeNewPM";
+      MPM.addPass(PrintModulePass(outs(), Banner, true, false));
+    }
+
+    registerEnzymeAndPassPipeline(PB, false);
+    if (auto Err = PB.parsePassPipeline(MPM, "enzyme")) {
+      std::string ErrMsg = toString(std::move(Err));
+      LLVMRustSetLastError(ErrMsg.c_str());
+      return LLVMRustResult::Failure;
+    }
+
+    if (PrintAfterEnzyme) {
+      // Handle the Rust flag `-Zautodiff=PrintModAfter`.
+      std::string Banner = "Module after EnzymeNewPM";
+      MPM.addPass(PrintModulePass(outs(), Banner, true, false));
+    }
+  }
+#endif
+  if (PrintPasses) {
+    // Print all passes from the PM:
+    std::string Pipeline;
+    raw_string_ostream SOS(Pipeline);
+    MPM.printPipeline(SOS, [&PIC](StringRef ClassName) {
+      auto PassName = PIC.getPassNameForClassName(ClassName);
+      return PassName.empty() ? ClassName : PassName;
+    });
+    outs() << Pipeline;
+    outs() << "\n";
+  }
 
   // Upgrade all calls to old intrinsics first.
   for (Module::iterator I = TheModule->begin(), E = TheModule->end(); I != E;)
@@ -1251,12 +1345,12 @@ getFirstDefinitionForLinker(const GlobalValueSummaryList &GVSummaryList) {
 // here is basically the same as before threads are spawned in the `run`
 // function of `lib/LTO/ThinLTOCodeGenerator.cpp`.
 extern "C" LLVMRustThinLTOData *
-LLVMRustCreateThinLTOData(LLVMRustThinLTOModule *modules, int num_modules,
-                          const char **preserved_symbols, int num_symbols) {
+LLVMRustCreateThinLTOData(LLVMRustThinLTOModule *modules, size_t num_modules,
+                          const char **preserved_symbols, size_t num_symbols) {
   auto Ret = std::make_unique<LLVMRustThinLTOData>();
 
   // Load each module's summary and merge it into one combined index
-  for (int i = 0; i < num_modules; i++) {
+  for (size_t i = 0; i < num_modules; i++) {
     auto module = &modules[i];
     auto buffer = StringRef(module->data, module->len);
     auto mem_buffer = MemoryBufferRef(buffer, module->identifier);
@@ -1275,8 +1369,13 @@ LLVMRustCreateThinLTOData(LLVMRustThinLTOModule *modules, int num_modules,
 
   // Convert the preserved symbols set from string to GUID, this is then needed
   // for internalization.
-  for (int i = 0; i < num_symbols; i++) {
+  for (size_t i = 0; i < num_symbols; i++) {
+#if LLVM_VERSION_GE(21, 0)
+    auto GUID =
+        GlobalValue::getGUIDAssumingExternalLinkage(preserved_symbols[i]);
+#else
     auto GUID = GlobalValue::getGUID(preserved_symbols[i]);
+#endif
     Ret->GUIDPreservedSymbols.insert(GUID);
   }
 
@@ -1373,20 +1472,14 @@ static bool clearDSOLocalOnDeclarations(Module &Mod, TargetMachine &TM) {
   return ClearDSOLocalOnDeclarations;
 }
 
-extern "C" bool LLVMRustPrepareThinLTORename(const LLVMRustThinLTOData *Data,
+extern "C" void LLVMRustPrepareThinLTORename(const LLVMRustThinLTOData *Data,
                                              LLVMModuleRef M,
                                              LLVMTargetMachineRef TM) {
   Module &Mod = *unwrap(M);
   TargetMachine &Target = *unwrap(TM);
 
   bool ClearDSOLocal = clearDSOLocalOnDeclarations(Mod, Target);
-  bool error = renameModuleForThinLTO(Mod, Data->Index, ClearDSOLocal);
-
-  if (error) {
-    LLVMRustSetLastError("renameModuleForThinLTO failed");
-    return false;
-  }
-  return true;
+  renameModuleForThinLTO(Mod, Data->Index, ClearDSOLocal);
 }
 
 extern "C" bool
@@ -1465,19 +1558,6 @@ extern "C" bool LLVMRustPrepareThinLTOImport(const LLVMRustThinLTOData *Data,
   return true;
 }
 
-// This struct and various functions are sort of a hack right now, but the
-// problem is that we've got in-memory LLVM modules after we generate and
-// optimize all codegen-units for one compilation in rustc. To be compatible
-// with the LTO support above we need to serialize the modules plus their
-// ThinLTO summary into memory.
-//
-// This structure is basically an owned version of a serialize module, with
-// a ThinLTO summary attached.
-struct LLVMRustThinLTOBuffer {
-  std::string data;
-  std::string thin_link_data;
-};
-
 extern "C" LLVMRustThinLTOBuffer *
 LLVMRustThinLTOBufferCreate(LLVMModuleRef M, bool is_thin, bool emit_summary) {
   auto Ret = std::make_unique<LLVMRustThinLTOBuffer>();
@@ -1559,8 +1639,10 @@ extern "C" LLVMModuleRef LLVMRustParseBitcodeForLTO(LLVMContextRef Context,
 extern "C" const char *LLVMRustGetSliceFromObjectDataByName(const char *data,
                                                             size_t len,
                                                             const char *name,
+                                                            size_t name_len,
                                                             size_t *out_len) {
   *out_len = 0;
+  auto Name = StringRef(name, name_len);
   auto Data = StringRef(data, len);
   auto Buffer = MemoryBufferRef(Data, ""); // The id is unused.
   file_magic Type = identify_magic(Buffer.getBuffer());
@@ -1571,8 +1653,8 @@ extern "C" const char *LLVMRustGetSliceFromObjectDataByName(const char *data,
     return nullptr;
   }
   for (const object::SectionRef &Sec : (*ObjFileOrError)->sections()) {
-    Expected<StringRef> Name = Sec.getName();
-    if (Name && *Name == name) {
+    Expected<StringRef> SecName = Sec.getName();
+    if (SecName && *SecName == Name) {
       Expected<StringRef> SectionOrError = Sec.getContents();
       if (!SectionOrError) {
         LLVMRustSetLastError(toString(SectionOrError.takeError()).c_str());
@@ -1611,12 +1693,21 @@ extern "C" void LLVMRustComputeLTOCacheKey(RustStringRef KeyOut,
 #endif
 
   // Based on the 'InProcessThinBackend' constructor in LLVM
+#if LLVM_VERSION_GE(21, 0)
+  for (auto &Name : Data->Index.cfiFunctionDefs().symbols())
+    CfiFunctionDefs.insert(GlobalValue::getGUIDAssumingExternalLinkage(
+        GlobalValue::dropLLVMManglingEscape(Name)));
+  for (auto &Name : Data->Index.cfiFunctionDecls().symbols())
+    CfiFunctionDecls.insert(GlobalValue::getGUIDAssumingExternalLinkage(
+        GlobalValue::dropLLVMManglingEscape(Name)));
+#else
   for (auto &Name : Data->Index.cfiFunctionDefs())
     CfiFunctionDefs.insert(
         GlobalValue::getGUID(GlobalValue::dropLLVMManglingEscape(Name)));
   for (auto &Name : Data->Index.cfiFunctionDecls())
     CfiFunctionDecls.insert(
         GlobalValue::getGUID(GlobalValue::dropLLVMManglingEscape(Name)));
+#endif
 
 #if LLVM_VERSION_GE(20, 0)
   Key = llvm::computeLTOCacheKey(conf, Data->Index, ModId, ImportList,
@@ -1628,5 +1719,6 @@ extern "C" void LLVMRustComputeLTOCacheKey(RustStringRef KeyOut,
                            CfiFunctionDefs, CfiFunctionDecls);
 #endif
 
-  LLVMRustStringWriteImpl(KeyOut, Key.c_str(), Key.size());
+  auto OS = RawRustStringOstream(KeyOut);
+  OS << Key.str();
 }
diff --git a/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp b/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp
index 72b03fa0560..90aa9188c83 100644
--- a/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp
+++ b/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp
@@ -1,28 +1,40 @@
 #include "LLVMWrapper.h"
+
+#include "llvm-c/Analysis.h"
+#include "llvm-c/Core.h"
+#include "llvm-c/DebugInfo.h"
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/Statistic.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/BinaryFormat/Magic.h"
 #include "llvm/Bitcode/BitcodeWriter.h"
+#include "llvm/IR/DIBuilder.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/IRBuilder.h"
+#include "llvm/IR/InlineAsm.h"
 #include "llvm/IR/Instructions.h"
-#include "llvm/IR/Intrinsics.h"
 #include "llvm/IR/IntrinsicsARM.h"
+#include "llvm/IR/LLVMContext.h"
 #include "llvm/IR/LLVMRemarkStreamer.h"
 #include "llvm/IR/Mangler.h"
+#include "llvm/IR/Module.h"
 #include "llvm/IR/Value.h"
-#include "llvm/Object/Archive.h"
 #include "llvm/Object/COFFImportFile.h"
-#include "llvm/Object/ObjectFile.h"
-#include "llvm/Pass.h"
 #include "llvm/Remarks/RemarkFormat.h"
 #include "llvm/Remarks/RemarkSerializer.h"
 #include "llvm/Remarks/RemarkStreamer.h"
+#include "llvm/Support/Compression.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/JSON.h"
 #include "llvm/Support/ModRef.h"
 #include "llvm/Support/Signals.h"
+#include "llvm/Support/Timer.h"
 #include "llvm/Support/ToolOutputFile.h"
-
 #include <iostream>
 
 // for raw `write` in the bad-alloc handler
@@ -43,6 +55,10 @@ using namespace llvm;
 using namespace llvm::sys;
 using namespace llvm::object;
 
+// This opcode is an LLVM detail that could hypothetically change (?), so
+// verify that the hard-coded value in `dwarf_const.rs` still agrees with LLVM.
+static_assert(dwarf::DW_OP_LLVM_fragment == 0x1000);
+
 // LLVMAtomicOrdering is already an enum - don't create another
 // one.
 static AtomicOrdering fromRust(LLVMAtomicOrdering Ordering) {
@@ -136,30 +152,22 @@ extern "C" LLVMContextRef LLVMRustContextCreate(bool shouldDiscardNames) {
 }
 
 extern "C" void LLVMRustSetNormalizedTarget(LLVMModuleRef M,
-                                            const char *Triple) {
-  unwrap(M)->setTargetTriple(Triple::normalize(Triple));
+                                            const char *Target) {
+#if LLVM_VERSION_GE(21, 0)
+  unwrap(M)->setTargetTriple(Triple(Triple::normalize(Target)));
+#else
+  unwrap(M)->setTargetTriple(Triple::normalize(Target));
+#endif
 }
 
-extern "C" const char *LLVMRustPrintPassTimings(size_t *Len) {
-  std::string buf;
-  auto SS = raw_string_ostream(buf);
-  TimerGroup::printAll(SS);
-  SS.flush();
-  *Len = buf.length();
-  char *CStr = (char *)malloc(*Len);
-  memcpy(CStr, buf.c_str(), *Len);
-  return CStr;
+extern "C" void LLVMRustPrintPassTimings(RustStringRef OutBuf) {
+  auto OS = RawRustStringOstream(OutBuf);
+  TimerGroup::printAll(OS);
 }
 
-extern "C" const char *LLVMRustPrintStatistics(size_t *Len) {
-  std::string buf;
-  auto SS = raw_string_ostream(buf);
-  llvm::PrintStatistics(SS);
-  SS.flush();
-  *Len = buf.length();
-  char *CStr = (char *)malloc(*Len);
-  memcpy(CStr, buf.c_str(), *Len);
-  return CStr;
+extern "C" void LLVMRustPrintStatistics(RustStringRef OutBuf) {
+  auto OS = RawRustStringOstream(OutBuf);
+  llvm::PrintStatistics(OS);
 }
 
 extern "C" LLVMValueRef LLVMRustGetNamedValue(LLVMModuleRef M, const char *Name,
@@ -167,31 +175,28 @@ extern "C" LLVMValueRef LLVMRustGetNamedValue(LLVMModuleRef M, const char *Name,
   return wrap(unwrap(M)->getNamedValue(StringRef(Name, NameLen)));
 }
 
-enum class LLVMRustTailCallKind {
-  None,
-  Tail,
-  MustTail,
-  NoTail,
+enum class LLVMRustVerifierFailureAction {
+  AbortProcessAction = 0,
+  PrintMessageAction = 1,
+  ReturnStatusAction = 2,
 };
 
-static CallInst::TailCallKind fromRust(LLVMRustTailCallKind Kind) {
-  switch (Kind) {
-  case LLVMRustTailCallKind::None:
-    return CallInst::TailCallKind::TCK_None;
-  case LLVMRustTailCallKind::Tail:
-    return CallInst::TailCallKind::TCK_Tail;
-  case LLVMRustTailCallKind::MustTail:
-    return CallInst::TailCallKind::TCK_MustTail;
-  case LLVMRustTailCallKind::NoTail:
-    return CallInst::TailCallKind::TCK_NoTail;
-  default:
-    report_fatal_error("bad CallInst::TailCallKind.");
+static LLVMVerifierFailureAction
+fromRust(LLVMRustVerifierFailureAction Action) {
+  switch (Action) {
+  case LLVMRustVerifierFailureAction::AbortProcessAction:
+    return LLVMAbortProcessAction;
+  case LLVMRustVerifierFailureAction::PrintMessageAction:
+    return LLVMPrintMessageAction;
+  case LLVMRustVerifierFailureAction::ReturnStatusAction:
+    return LLVMReturnStatusAction;
   }
+  report_fatal_error("Invalid LLVMVerifierFailureAction value!");
 }
 
-extern "C" void LLVMRustSetTailCallKind(LLVMValueRef Call,
-                                        LLVMRustTailCallKind TCK) {
-  unwrap<CallInst>(Call)->setTailCallKind(fromRust(TCK));
+extern "C" LLVMBool
+LLVMRustVerifyFunction(LLVMValueRef Fn, LLVMRustVerifierFailureAction Action) {
+  return LLVMVerifyFunction(Fn, fromRust(Action));
 }
 
 extern "C" LLVMValueRef LLVMRustGetOrInsertFunction(LLVMModuleRef M,
@@ -228,94 +233,144 @@ extern "C" LLVMValueRef LLVMRustInsertPrivateGlobal(LLVMModuleRef M,
                                  GlobalValue::PrivateLinkage, nullptr));
 }
 
-static Attribute::AttrKind fromRust(LLVMRustAttribute Kind) {
+// Must match the layout of `rustc_codegen_llvm::llvm::ffi::AttributeKind`.
+enum class LLVMRustAttributeKind {
+  AlwaysInline = 0,
+  ByVal = 1,
+  Cold = 2,
+  InlineHint = 3,
+  MinSize = 4,
+  Naked = 5,
+  NoAlias = 6,
+  NoCapture = 7,
+  NoInline = 8,
+  NonNull = 9,
+  NoRedZone = 10,
+  NoReturn = 11,
+  NoUnwind = 12,
+  OptimizeForSize = 13,
+  ReadOnly = 14,
+  SExt = 15,
+  StructRet = 16,
+  UWTable = 17,
+  ZExt = 18,
+  InReg = 19,
+  SanitizeThread = 20,
+  SanitizeAddress = 21,
+  SanitizeMemory = 22,
+  NonLazyBind = 23,
+  OptimizeNone = 24,
+  ReadNone = 26,
+  SanitizeHWAddress = 28,
+  WillReturn = 29,
+  StackProtectReq = 30,
+  StackProtectStrong = 31,
+  StackProtect = 32,
+  NoUndef = 33,
+  SanitizeMemTag = 34,
+  NoCfCheck = 35,
+  ShadowCallStack = 36,
+  AllocSize = 37,
+  AllocatedPointer = 38,
+  AllocAlign = 39,
+  SanitizeSafeStack = 40,
+  FnRetThunkExtern = 41,
+  Writable = 42,
+  DeadOnUnwind = 43,
+};
+
+static Attribute::AttrKind fromRust(LLVMRustAttributeKind Kind) {
   switch (Kind) {
-  case AlwaysInline:
+  case LLVMRustAttributeKind::AlwaysInline:
     return Attribute::AlwaysInline;
-  case ByVal:
+  case LLVMRustAttributeKind::ByVal:
     return Attribute::ByVal;
-  case Cold:
+  case LLVMRustAttributeKind::Cold:
     return Attribute::Cold;
-  case InlineHint:
+  case LLVMRustAttributeKind::InlineHint:
     return Attribute::InlineHint;
-  case MinSize:
+  case LLVMRustAttributeKind::MinSize:
     return Attribute::MinSize;
-  case Naked:
+  case LLVMRustAttributeKind::Naked:
     return Attribute::Naked;
-  case NoAlias:
+  case LLVMRustAttributeKind::NoAlias:
     return Attribute::NoAlias;
-  case NoCapture:
+  case LLVMRustAttributeKind::NoCapture:
+#if LLVM_VERSION_GE(21, 0)
+    report_fatal_error("NoCapture doesn't exist in LLVM 21");
+#else
     return Attribute::NoCapture;
-  case NoCfCheck:
+#endif
+  case LLVMRustAttributeKind::NoCfCheck:
     return Attribute::NoCfCheck;
-  case NoInline:
+  case LLVMRustAttributeKind::NoInline:
     return Attribute::NoInline;
-  case NonNull:
+  case LLVMRustAttributeKind::NonNull:
     return Attribute::NonNull;
-  case NoRedZone:
+  case LLVMRustAttributeKind::NoRedZone:
     return Attribute::NoRedZone;
-  case NoReturn:
+  case LLVMRustAttributeKind::NoReturn:
     return Attribute::NoReturn;
-  case NoUnwind:
+  case LLVMRustAttributeKind::NoUnwind:
     return Attribute::NoUnwind;
-  case OptimizeForSize:
+  case LLVMRustAttributeKind::OptimizeForSize:
     return Attribute::OptimizeForSize;
-  case ReadOnly:
+  case LLVMRustAttributeKind::ReadOnly:
     return Attribute::ReadOnly;
-  case SExt:
+  case LLVMRustAttributeKind::SExt:
     return Attribute::SExt;
-  case StructRet:
+  case LLVMRustAttributeKind::StructRet:
     return Attribute::StructRet;
-  case UWTable:
+  case LLVMRustAttributeKind::UWTable:
     return Attribute::UWTable;
-  case ZExt:
+  case LLVMRustAttributeKind::ZExt:
     return Attribute::ZExt;
-  case InReg:
+  case LLVMRustAttributeKind::InReg:
     return Attribute::InReg;
-  case SanitizeThread:
+  case LLVMRustAttributeKind::SanitizeThread:
     return Attribute::SanitizeThread;
-  case SanitizeAddress:
+  case LLVMRustAttributeKind::SanitizeAddress:
     return Attribute::SanitizeAddress;
-  case SanitizeMemory:
+  case LLVMRustAttributeKind::SanitizeMemory:
     return Attribute::SanitizeMemory;
-  case NonLazyBind:
+  case LLVMRustAttributeKind::NonLazyBind:
     return Attribute::NonLazyBind;
-  case OptimizeNone:
+  case LLVMRustAttributeKind::OptimizeNone:
     return Attribute::OptimizeNone;
-  case ReadNone:
+  case LLVMRustAttributeKind::ReadNone:
     return Attribute::ReadNone;
-  case SanitizeHWAddress:
+  case LLVMRustAttributeKind::SanitizeHWAddress:
     return Attribute::SanitizeHWAddress;
-  case WillReturn:
+  case LLVMRustAttributeKind::WillReturn:
     return Attribute::WillReturn;
-  case StackProtectReq:
+  case LLVMRustAttributeKind::StackProtectReq:
     return Attribute::StackProtectReq;
-  case StackProtectStrong:
+  case LLVMRustAttributeKind::StackProtectStrong:
     return Attribute::StackProtectStrong;
-  case StackProtect:
+  case LLVMRustAttributeKind::StackProtect:
     return Attribute::StackProtect;
-  case NoUndef:
+  case LLVMRustAttributeKind::NoUndef:
     return Attribute::NoUndef;
-  case SanitizeMemTag:
+  case LLVMRustAttributeKind::SanitizeMemTag:
     return Attribute::SanitizeMemTag;
-  case ShadowCallStack:
+  case LLVMRustAttributeKind::ShadowCallStack:
     return Attribute::ShadowCallStack;
-  case AllocSize:
+  case LLVMRustAttributeKind::AllocSize:
     return Attribute::AllocSize;
-  case AllocatedPointer:
+  case LLVMRustAttributeKind::AllocatedPointer:
     return Attribute::AllocatedPointer;
-  case AllocAlign:
+  case LLVMRustAttributeKind::AllocAlign:
     return Attribute::AllocAlign;
-  case SanitizeSafeStack:
+  case LLVMRustAttributeKind::SanitizeSafeStack:
     return Attribute::SafeStack;
-  case FnRetThunkExtern:
+  case LLVMRustAttributeKind::FnRetThunkExtern:
     return Attribute::FnRetThunkExtern;
-  case Writable:
+  case LLVMRustAttributeKind::Writable:
     return Attribute::Writable;
-  case DeadOnUnwind:
+  case LLVMRustAttributeKind::DeadOnUnwind:
     return Attribute::DeadOnUnwind;
   }
-  report_fatal_error("bad AttributeKind");
+  report_fatal_error("bad LLVMRustAttributeKind");
 }
 
 template <typename T>
@@ -329,6 +384,12 @@ static inline void AddAttributes(T *t, unsigned Index, LLVMAttributeRef *Attrs,
   t->setAttributes(PALNew);
 }
 
+extern "C" bool LLVMRustHasAttributeAtIndex(LLVMValueRef Fn, unsigned Index,
+                                            LLVMRustAttributeKind RustAttr) {
+  Function *F = unwrap<Function>(Fn);
+  return F->hasParamAttribute(Index, fromRust(RustAttr));
+}
+
 extern "C" void LLVMRustAddFunctionAttributes(LLVMValueRef Fn, unsigned Index,
                                               LLVMAttributeRef *Attrs,
                                               size_t AttrsLen) {
@@ -344,8 +405,25 @@ extern "C" void LLVMRustAddCallSiteAttributes(LLVMValueRef Instr,
   AddAttributes(Call, Index, Attrs, AttrsLen);
 }
 
+extern "C" LLVMValueRef LLVMRustGetTerminator(LLVMBasicBlockRef BB) {
+  Instruction *ret = unwrap(BB)->getTerminator();
+  return wrap(ret);
+}
+
+extern "C" void LLVMRustEraseInstFromParent(LLVMValueRef Instr) {
+  if (auto I = dyn_cast<Instruction>(unwrap<Value>(Instr))) {
+    I->eraseFromParent();
+  }
+}
+
 extern "C" LLVMAttributeRef
-LLVMRustCreateAttrNoValue(LLVMContextRef C, LLVMRustAttribute RustAttr) {
+LLVMRustCreateAttrNoValue(LLVMContextRef C, LLVMRustAttributeKind RustAttr) {
+#if LLVM_VERSION_GE(21, 0)
+  // LLVM 21 replaced the NoCapture attribute with Captures(none).
+  if (RustAttr == LLVMRustAttributeKind::NoCapture) {
+    return wrap(Attribute::getWithCaptureInfo(*unwrap(C), CaptureInfo::none()));
+  }
+#endif
   return wrap(Attribute::get(*unwrap(C), fromRust(RustAttr)));
 }
 
@@ -395,12 +473,8 @@ extern "C" LLVMAttributeRef
 LLVMRustCreateRangeAttribute(LLVMContextRef C, unsigned NumBits,
                              const uint64_t LowerWords[],
                              const uint64_t UpperWords[]) {
-#if LLVM_VERSION_GE(19, 0)
   return LLVMCreateConstantRangeAttribute(C, Attribute::Range, NumBits,
                                           LowerWords, UpperWords);
-#else
-  report_fatal_error("LLVM 19.0 is required for Range Attribute");
-#endif
 }
 
 // These values **must** match ffi::AllocKindFlags.
@@ -548,31 +622,8 @@ extern "C" LLVMValueRef LLVMRustBuildAtomicStore(LLVMBuilderRef B,
   return wrap(SI);
 }
 
-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) {
-  return wrap(InlineAsm::get(
-      unwrap<FunctionType>(Ty), StringRef(AsmString, AsmStringLen),
-      StringRef(Constraints, ConstraintsLen), HasSideEffects, IsAlignStack,
-      fromRust(Dialect), CanThrow));
+extern "C" uint64_t LLVMRustGetArrayNumElements(LLVMTypeRef Ty) {
+  return unwrap(Ty)->getArrayNumElements();
 }
 
 extern "C" bool LLVMRustInlineAsmVerify(LLVMTypeRef Ty, char *Constraints,
@@ -582,8 +633,6 @@ extern "C" bool LLVMRustInlineAsmVerify(LLVMTypeRef Ty, char *Constraints,
       unwrap<FunctionType>(Ty), StringRef(Constraints, ConstraintsLen)));
 }
 
-typedef DIBuilder *LLVMRustDIBuilderRef;
-
 template <typename DIT> DIT *unwrapDIPtr(LLVMMetadataRef Ref) {
   return (DIT *)(Ref ? unwrap<MDNode>(Ref) : nullptr);
 }
@@ -592,120 +641,67 @@ template <typename DIT> DIT *unwrapDIPtr(LLVMMetadataRef Ref) {
 #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;
+// Statically assert that `LLVMDIFlags` (C) and `DIFlags` (C++) have the same
+// layout, at least for the flags we know about. This isn't guaranteed, but is
+// likely to remain true, and as long as it is true it makes conversions easy.
+#define ASSERT_DIFLAG_VALUE(FLAG, VALUE)                                       \
+  static_assert((LLVMDI##FLAG == (VALUE)) && (DINode::DIFlags::FLAG == (VALUE)))
+ASSERT_DIFLAG_VALUE(FlagZero, 0);
+ASSERT_DIFLAG_VALUE(FlagPrivate, 1);
+ASSERT_DIFLAG_VALUE(FlagProtected, 2);
+ASSERT_DIFLAG_VALUE(FlagPublic, 3);
+// Bit (1 << 1) is part of the private/protected/public values above.
+ASSERT_DIFLAG_VALUE(FlagFwdDecl, 1 << 2);
+ASSERT_DIFLAG_VALUE(FlagAppleBlock, 1 << 3);
+ASSERT_DIFLAG_VALUE(FlagReservedBit4, 1 << 4);
+ASSERT_DIFLAG_VALUE(FlagVirtual, 1 << 5);
+ASSERT_DIFLAG_VALUE(FlagArtificial, 1 << 6);
+ASSERT_DIFLAG_VALUE(FlagExplicit, 1 << 7);
+ASSERT_DIFLAG_VALUE(FlagPrototyped, 1 << 8);
+ASSERT_DIFLAG_VALUE(FlagObjcClassComplete, 1 << 9);
+ASSERT_DIFLAG_VALUE(FlagObjectPointer, 1 << 10);
+ASSERT_DIFLAG_VALUE(FlagVector, 1 << 11);
+ASSERT_DIFLAG_VALUE(FlagStaticMember, 1 << 12);
+ASSERT_DIFLAG_VALUE(FlagLValueReference, 1 << 13);
+ASSERT_DIFLAG_VALUE(FlagRValueReference, 1 << 14);
+// Bit (1 << 15) has been recycled, but the C API value hasn't been renamed.
+static_assert((LLVMDIFlagReserved == (1 << 15)) &&
+              (DINode::DIFlags::FlagExportSymbols == (1 << 15)));
+ASSERT_DIFLAG_VALUE(FlagSingleInheritance, 1 << 16);
+ASSERT_DIFLAG_VALUE(FlagMultipleInheritance, 2 << 16);
+ASSERT_DIFLAG_VALUE(FlagVirtualInheritance, 3 << 16);
+// Bit (1 << 17) is part of the inheritance values above.
+ASSERT_DIFLAG_VALUE(FlagIntroducedVirtual, 1 << 18);
+ASSERT_DIFLAG_VALUE(FlagBitField, 1 << 19);
+ASSERT_DIFLAG_VALUE(FlagNoReturn, 1 << 20);
+// Bit (1 << 21) is unused, but was `LLVMDIFlagMainSubprogram`.
+ASSERT_DIFLAG_VALUE(FlagTypePassByValue, 1 << 22);
+ASSERT_DIFLAG_VALUE(FlagTypePassByReference, 1 << 23);
+ASSERT_DIFLAG_VALUE(FlagEnumClass, 1 << 24);
+ASSERT_DIFLAG_VALUE(FlagThunk, 1 << 25);
+ASSERT_DIFLAG_VALUE(FlagNonTrivial, 1 << 26);
+ASSERT_DIFLAG_VALUE(FlagBigEndian, 1 << 27);
+ASSERT_DIFLAG_VALUE(FlagLittleEndian, 1 << 28);
+ASSERT_DIFLAG_VALUE(FlagIndirectVirtualBase, (1 << 2) | (1 << 5));
+#undef ASSERT_DIFLAG_VALUE
+
+// There are two potential ways to convert `LLVMDIFlags` to `DIFlags`:
+// - Check and copy every individual bit/subvalue from input to output.
+// - Statically assert that both have the same layout, and cast.
+// As long as the static assertions succeed, a cast is easier and faster.
+// In the (hopefully) unlikely event that the assertions do fail someday, and
+// LLVM doesn't expose its own conversion function, we'll have to switch over
+// to copying each bit/subvalue.
+static DINode::DIFlags fromRust(LLVMDIFlags Flags) {
+  // Check that all set bits are covered by the static assertions above.
+  const unsigned UNKNOWN_BITS = (1 << 31) | (1 << 30) | (1 << 29) | (1 << 21);
+  if (Flags & UNKNOWN_BITS) {
+    report_fatal_error("bad LLVMDIFlags");
+  }
+
+  // As long as the static assertions are satisfied and no unknown bits are
+  // present, we can convert from `LLVMDIFlags` to `DIFlags` with a cast.
+  return static_cast<DINode::DIFlags>(Flags);
 }
 
 // These values **must** match debuginfo::DISPFlags! They also *happen*
@@ -853,23 +849,122 @@ extern "C" uint32_t LLVMRustVersionMinor() { return LLVM_VERSION_MINOR; }
 
 extern "C" uint32_t LLVMRustVersionMajor() { return LLVM_VERSION_MAJOR; }
 
-extern "C" void LLVMRustAddModuleFlagU32(LLVMModuleRef M,
-                                         Module::ModFlagBehavior MergeBehavior,
-                                         const char *Name, uint32_t Value) {
-  unwrap(M)->addModuleFlag(MergeBehavior, Name, Value);
+// FFI equivalent of LLVM's `llvm::Module::ModFlagBehavior`.
+// Must match the layout of
+// `rustc_codegen_llvm::llvm::ffi::ModuleFlagMergeBehavior`.
+//
+// There is a stable LLVM-C version of this enum (`LLVMModuleFlagBehavior`),
+// but as of LLVM 19 it does not support all of the enum values in the unstable
+// C++ API.
+enum class LLVMRustModuleFlagMergeBehavior {
+  Error = 1,
+  Warning = 2,
+  Require = 3,
+  Override = 4,
+  Append = 5,
+  AppendUnique = 6,
+  Max = 7,
+  Min = 8,
+};
+
+static Module::ModFlagBehavior
+fromRust(LLVMRustModuleFlagMergeBehavior Behavior) {
+  switch (Behavior) {
+  case LLVMRustModuleFlagMergeBehavior::Error:
+    return Module::ModFlagBehavior::Error;
+  case LLVMRustModuleFlagMergeBehavior::Warning:
+    return Module::ModFlagBehavior::Warning;
+  case LLVMRustModuleFlagMergeBehavior::Require:
+    return Module::ModFlagBehavior::Require;
+  case LLVMRustModuleFlagMergeBehavior::Override:
+    return Module::ModFlagBehavior::Override;
+  case LLVMRustModuleFlagMergeBehavior::Append:
+    return Module::ModFlagBehavior::Append;
+  case LLVMRustModuleFlagMergeBehavior::AppendUnique:
+    return Module::ModFlagBehavior::AppendUnique;
+  case LLVMRustModuleFlagMergeBehavior::Max:
+    return Module::ModFlagBehavior::Max;
+  case LLVMRustModuleFlagMergeBehavior::Min:
+    return Module::ModFlagBehavior::Min;
+  }
+  report_fatal_error("bad LLVMRustModuleFlagMergeBehavior");
+}
+
+extern "C" void
+LLVMRustAddModuleFlagU32(LLVMModuleRef M,
+                         LLVMRustModuleFlagMergeBehavior MergeBehavior,
+                         const char *Name, size_t NameLen, uint32_t Value) {
+  unwrap(M)->addModuleFlag(fromRust(MergeBehavior), StringRef(Name, NameLen),
+                           Value);
 }
 
 extern "C" void LLVMRustAddModuleFlagString(
-    LLVMModuleRef M, Module::ModFlagBehavior MergeBehavior, const char *Name,
-    const char *Value, size_t ValueLen) {
+    LLVMModuleRef M, LLVMRustModuleFlagMergeBehavior MergeBehavior,
+    const char *Name, size_t NameLen, const char *Value, size_t ValueLen) {
   unwrap(M)->addModuleFlag(
-      MergeBehavior, Name,
+      fromRust(MergeBehavior), StringRef(Name, NameLen),
       MDString::get(unwrap(M)->getContext(), StringRef(Value, ValueLen)));
 }
 
-extern "C" bool LLVMRustHasModuleFlag(LLVMModuleRef M, const char *Name,
-                                      size_t Len) {
-  return unwrap(M)->getModuleFlag(StringRef(Name, Len)) != nullptr;
+extern "C" LLVMValueRef LLVMRustGetLastInstruction(LLVMBasicBlockRef BB) {
+  auto Point = unwrap(BB)->rbegin();
+  if (Point != unwrap(BB)->rend())
+    return wrap(&*Point);
+  return nullptr;
+}
+
+extern "C" void LLVMRustEraseInstUntilInclusive(LLVMBasicBlockRef bb,
+                                                LLVMValueRef I) {
+  auto &BB = *unwrap(bb);
+  auto &Inst = *unwrap<Instruction>(I);
+  auto It = BB.begin();
+  while (&*It != &Inst)
+    ++It;
+  // Make sure we found the Instruction.
+  assert(It != BB.end());
+  // Delete in rev order to ensure no dangling references.
+  while (It != BB.begin()) {
+    auto Prev = std::prev(It);
+    It->eraseFromParent();
+    It = Prev;
+  }
+  It->eraseFromParent();
+}
+
+extern "C" bool LLVMRustHasMetadata(LLVMValueRef inst, unsigned kindID) {
+  if (auto *I = dyn_cast<Instruction>(unwrap<Value>(inst))) {
+    return I->hasMetadata(kindID);
+  }
+  return false;
+}
+
+extern "C" LLVMMetadataRef LLVMRustDIGetInstMetadata(LLVMValueRef x) {
+  if (auto *I = dyn_cast<Instruction>(unwrap<Value>(x))) {
+    auto *MD = I->getDebugLoc().getAsMDNode();
+    return wrap(MD);
+  }
+  return nullptr;
+}
+
+extern "C" void
+LLVMRustRemoveEnumAttributeAtIndex(LLVMValueRef F, size_t index,
+                                   LLVMRustAttributeKind RustAttr) {
+  LLVMRemoveEnumAttributeAtIndex(F, index, fromRust(RustAttr));
+}
+
+extern "C" bool LLVMRustHasFnAttribute(LLVMValueRef F, const char *Name,
+                                       size_t NameLen) {
+  if (auto *Fn = dyn_cast<Function>(unwrap<Value>(F))) {
+    return Fn->hasFnAttribute(StringRef(Name, NameLen));
+  }
+  return false;
+}
+
+extern "C" void LLVMRustRemoveFnAttribute(LLVMValueRef Fn, const char *Name,
+                                          size_t NameLen) {
+  if (auto *F = dyn_cast<Function>(unwrap<Value>(Fn))) {
+    F->removeFnAttr(StringRef(Name, NameLen));
+  }
 }
 
 extern "C" void LLVMRustGlobalAddMetadata(LLVMValueRef Global, unsigned Kind,
@@ -877,34 +972,30 @@ extern "C" void LLVMRustGlobalAddMetadata(LLVMValueRef Global, unsigned Kind,
   unwrap<GlobalObject>(Global)->addMetadata(Kind, *unwrap<MDNode>(MD));
 }
 
-extern "C" LLVMRustDIBuilderRef LLVMRustDIBuilderCreate(LLVMModuleRef M) {
-  return new DIBuilder(*unwrap(M));
+extern "C" LLVMDIBuilderRef LLVMRustDIBuilderCreate(LLVMModuleRef M) {
+  return wrap(new DIBuilder(*unwrap(M)));
 }
 
-extern "C" void LLVMRustDIBuilderDispose(LLVMRustDIBuilderRef Builder) {
-  delete Builder;
-}
-
-extern "C" void LLVMRustDIBuilderFinalize(LLVMRustDIBuilderRef Builder) {
-  Builder->finalize();
+extern "C" void LLVMRustDIBuilderDispose(LLVMDIBuilderRef Builder) {
+  delete unwrap(Builder);
 }
 
 extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateCompileUnit(
-    LLVMRustDIBuilderRef Builder, unsigned Lang, LLVMMetadataRef FileRef,
+    LLVMDIBuilderRef 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, LLVMRustDebugNameTableKind TableKind) {
   auto *File = unwrapDI<DIFile>(FileRef);
 
-  return wrap(Builder->createCompileUnit(
+  return wrap(unwrap(Builder)->createCompileUnit(
       Lang, File, StringRef(Producer, ProducerLen), isOptimized, Flags,
       RuntimeVer, StringRef(SplitName, SplitNameLen), fromRust(Kind), DWOId,
       SplitDebugInlining, false, fromRust(TableKind)));
 }
 
 extern "C" LLVMMetadataRef
-LLVMRustDIBuilderCreateFile(LLVMRustDIBuilderRef Builder, const char *Filename,
+LLVMRustDIBuilderCreateFile(LLVMDIBuilderRef Builder, const char *Filename,
                             size_t FilenameLen, const char *Directory,
                             size_t DirectoryLen, LLVMRustChecksumKind CSKind,
                             const char *Checksum, size_t ChecksumLen,
@@ -917,29 +1008,29 @@ LLVMRustDIBuilderCreateFile(LLVMRustDIBuilderRef Builder, const char *Filename,
   std::optional<StringRef> oSource{};
   if (Source)
     oSource = StringRef(Source, SourceLen);
-  return wrap(Builder->createFile(StringRef(Filename, FilenameLen),
-                                  StringRef(Directory, DirectoryLen), CSInfo,
-                                  oSource));
+  return wrap(unwrap(Builder)->createFile(StringRef(Filename, FilenameLen),
+                                          StringRef(Directory, DirectoryLen),
+                                          CSInfo, oSource));
 }
 
 extern "C" LLVMMetadataRef
-LLVMRustDIBuilderCreateSubroutineType(LLVMRustDIBuilderRef Builder,
+LLVMRustDIBuilderCreateSubroutineType(LLVMDIBuilderRef Builder,
                                       LLVMMetadataRef ParameterTypes) {
-  return wrap(Builder->createSubroutineType(
+  return wrap(unwrap(Builder)->createSubroutineType(
       DITypeRefArray(unwrap<MDTuple>(ParameterTypes))));
 }
 
 extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateFunction(
-    LLVMRustDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
+    LLVMDIBuilderRef 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,
+    unsigned ScopeLine, LLVMDIFlags 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(
+  DISubprogram *Sub = unwrap(Builder)->createFunction(
       unwrapDI<DIScope>(Scope), StringRef(Name, NameLen),
       StringRef(LinkageName, LinkageNameLen), unwrapDI<DIFile>(File), LineNo,
       unwrapDI<DISubroutineType>(Ty), ScopeLine, llvmFlags, llvmSPFlags,
@@ -950,15 +1041,15 @@ extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateFunction(
 }
 
 extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateMethod(
-    LLVMRustDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
+    LLVMDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
     size_t NameLen, const char *LinkageName, size_t LinkageNameLen,
     LLVMMetadataRef File, unsigned LineNo, LLVMMetadataRef Ty,
-    LLVMRustDIFlags Flags, LLVMRustDISPFlags SPFlags, LLVMMetadataRef TParam) {
+    LLVMDIFlags Flags, LLVMRustDISPFlags SPFlags, LLVMMetadataRef TParam) {
   DITemplateParameterArray TParams =
       DITemplateParameterArray(unwrap<MDTuple>(TParam));
   DISubprogram::DISPFlags llvmSPFlags = fromRust(SPFlags);
   DINode::DIFlags llvmFlags = fromRust(Flags);
-  DISubprogram *Sub = Builder->createMethod(
+  DISubprogram *Sub = unwrap(Builder)->createMethod(
       unwrapDI<DIScope>(Scope), StringRef(Name, NameLen),
       StringRef(LinkageName, LinkageNameLen), unwrapDI<DIFile>(File), LineNo,
       unwrapDI<DISubroutineType>(Ty), 0, 0,
@@ -968,39 +1059,39 @@ extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateMethod(
 }
 
 extern "C" LLVMMetadataRef
-LLVMRustDIBuilderCreateBasicType(LLVMRustDIBuilderRef Builder, const char *Name,
+LLVMRustDIBuilderCreateBasicType(LLVMDIBuilderRef Builder, const char *Name,
                                  size_t NameLen, uint64_t SizeInBits,
                                  unsigned Encoding) {
-  return wrap(
-      Builder->createBasicType(StringRef(Name, NameLen), SizeInBits, Encoding));
+  return wrap(unwrap(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(
+LLVMRustDIBuilderCreateTypedef(LLVMDIBuilderRef Builder, LLVMMetadataRef Type,
+                               const char *Name, size_t NameLen,
+                               LLVMMetadataRef File, unsigned LineNo,
+                               LLVMMetadataRef Scope) {
+  return wrap(unwrap(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)));
+    LLVMDIBuilderRef Builder, LLVMMetadataRef PointeeTy, uint64_t SizeInBits,
+    uint32_t AlignInBits, unsigned AddressSpace, const char *Name,
+    size_t NameLen) {
+  return wrap(unwrap(Builder)->createPointerType(
+      unwrapDI<DIType>(PointeeTy), SizeInBits, AlignInBits, AddressSpace,
+      StringRef(Name, NameLen)));
 }
 
 extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateStructType(
-    LLVMRustDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
+    LLVMDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
     size_t NameLen, LLVMMetadataRef File, unsigned LineNumber,
-    uint64_t SizeInBits, uint32_t AlignInBits, LLVMRustDIFlags Flags,
+    uint64_t SizeInBits, uint32_t AlignInBits, LLVMDIFlags Flags,
     LLVMMetadataRef DerivedFrom, LLVMMetadataRef Elements, unsigned RunTimeLang,
     LLVMMetadataRef VTableHolder, const char *UniqueId, size_t UniqueIdLen) {
-  return wrap(Builder->createStructType(
+  return wrap(unwrap(Builder)->createStructType(
       unwrapDI<DIDescriptor>(Scope), StringRef(Name, NameLen),
       unwrapDI<DIFile>(File), LineNumber, SizeInBits, AlignInBits,
       fromRust(Flags), unwrapDI<DIType>(DerivedFrom),
@@ -1009,12 +1100,12 @@ extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateStructType(
 }
 
 extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateVariantPart(
-    LLVMRustDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
+    LLVMDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
     size_t NameLen, LLVMMetadataRef File, unsigned LineNumber,
-    uint64_t SizeInBits, uint32_t AlignInBits, LLVMRustDIFlags Flags,
+    uint64_t SizeInBits, uint32_t AlignInBits, LLVMDIFlags Flags,
     LLVMMetadataRef Discriminator, LLVMMetadataRef Elements,
     const char *UniqueId, size_t UniqueIdLen) {
-  return wrap(Builder->createVariantPart(
+  return wrap(unwrap(Builder)->createVariantPart(
       unwrapDI<DIDescriptor>(Scope), StringRef(Name, NameLen),
       unwrapDI<DIFile>(File), LineNumber, SizeInBits, AlignInBits,
       fromRust(Flags), unwrapDI<DIDerivedType>(Discriminator),
@@ -1023,57 +1114,50 @@ extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateVariantPart(
 }
 
 extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateMemberType(
-    LLVMRustDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
+    LLVMDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
     size_t NameLen, LLVMMetadataRef File, unsigned LineNo, uint64_t SizeInBits,
-    uint32_t AlignInBits, uint64_t OffsetInBits, LLVMRustDIFlags Flags,
+    uint32_t AlignInBits, uint64_t OffsetInBits, LLVMDIFlags Flags,
     LLVMMetadataRef Ty) {
-  return wrap(Builder->createMemberType(
+  return wrap(unwrap(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,
+    LLVMDIBuilderRef 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) {
+    LLVMDIFlags Flags, LLVMMetadataRef Ty) {
   llvm::ConstantInt *D = nullptr;
   if (Discriminant) {
     D = unwrap<llvm::ConstantInt>(Discriminant);
   }
-  return wrap(Builder->createVariantMemberType(
+  return wrap(unwrap(Builder)->createVariantMemberType(
       unwrapDI<DIDescriptor>(Scope), StringRef(Name, NameLen),
       unwrapDI<DIFile>(File), LineNo, SizeInBits, AlignInBits, OffsetInBits, D,
       fromRust(Flags), unwrapDI<DIType>(Ty)));
 }
 
 extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateStaticMemberType(
-    LLVMRustDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
+    LLVMDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
     size_t NameLen, LLVMMetadataRef File, unsigned LineNo, LLVMMetadataRef Ty,
-    LLVMRustDIFlags Flags, LLVMValueRef val, uint32_t AlignInBits) {
-  return wrap(Builder->createStaticMemberType(
+    LLVMDIFlags Flags, LLVMValueRef val, uint32_t AlignInBits) {
+  return wrap(unwrap(Builder)->createStaticMemberType(
       unwrapDI<DIDescriptor>(Scope), StringRef(Name, NameLen),
       unwrapDI<DIFile>(File), LineNo, unwrapDI<DIType>(Ty), fromRust(Flags),
       unwrap<llvm::ConstantInt>(val), llvm::dwarf::DW_TAG_member, AlignInBits));
 }
 
 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)));
+LLVMRustDIBuilderCreateQualifiedType(LLVMDIBuilderRef Builder, unsigned Tag,
+                                     LLVMMetadataRef Type) {
+  return wrap(
+      unwrap(Builder)->createQualifiedType(Tag, unwrapDI<DIType>(Type)));
 }
 
 extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateStaticVariable(
-    LLVMRustDIBuilderRef Builder, LLVMMetadataRef Context, const char *Name,
+    LLVMDIBuilderRef 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,
@@ -1082,16 +1166,16 @@ extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateStaticVariable(
 
   llvm::DIExpression *InitExpr = nullptr;
   if (llvm::ConstantInt *IntVal = llvm::dyn_cast<llvm::ConstantInt>(InitVal)) {
-    InitExpr = Builder->createConstantValueExpression(
+    InitExpr = unwrap(Builder)->createConstantValueExpression(
         IntVal->getValue().getSExtValue());
   } else if (llvm::ConstantFP *FPVal =
                  llvm::dyn_cast<llvm::ConstantFP>(InitVal)) {
-    InitExpr = Builder->createConstantValueExpression(
+    InitExpr = unwrap(Builder)->createConstantValueExpression(
         FPVal->getValueAPF().bitcastToAPInt().getZExtValue());
   }
 
   llvm::DIGlobalVariableExpression *VarExpr =
-      Builder->createGlobalVariableExpression(
+      unwrap(Builder)->createGlobalVariableExpression(
           unwrapDI<DIDescriptor>(Context), StringRef(Name, NameLen),
           StringRef(LinkageName, LinkageNameLen), unwrapDI<DIFile>(File),
           LineNo, unwrapDI<DIType>(Ty), IsLocalToUnit,
@@ -1104,17 +1188,17 @@ extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateStaticVariable(
 }
 
 extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateVariable(
-    LLVMRustDIBuilderRef Builder, unsigned Tag, LLVMMetadataRef Scope,
+    LLVMDIBuilderRef 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) {
+    LLVMMetadataRef Ty, bool AlwaysPreserve, LLVMDIFlags Flags, unsigned ArgNo,
+    uint32_t AlignInBits) {
   if (Tag == 0x100) { // DW_TAG_auto_variable
-    return wrap(Builder->createAutoVariable(
+    return wrap(unwrap(Builder)->createAutoVariable(
         unwrapDI<DIDescriptor>(Scope), StringRef(Name, NameLen),
         unwrapDI<DIFile>(File), LineNo, unwrapDI<DIType>(Ty), AlwaysPreserve,
         fromRust(Flags), AlignInBits));
   } else {
-    return wrap(Builder->createParameterVariable(
+    return wrap(unwrap(Builder)->createParameterVariable(
         unwrapDI<DIDescriptor>(Scope), StringRef(Name, NameLen), ArgNo,
         unwrapDI<DIFile>(File), LineNo, unwrapDI<DIType>(Ty), AlwaysPreserve,
         fromRust(Flags)));
@@ -1122,53 +1206,56 @@ extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateVariable(
 }
 
 extern "C" LLVMMetadataRef
-LLVMRustDIBuilderCreateArrayType(LLVMRustDIBuilderRef Builder, uint64_t Size,
+LLVMRustDIBuilderCreateArrayType(LLVMDIBuilderRef Builder, uint64_t Size,
                                  uint32_t AlignInBits, LLVMMetadataRef Ty,
                                  LLVMMetadataRef Subscripts) {
-  return wrap(
-      Builder->createArrayType(Size, AlignInBits, unwrapDI<DIType>(Ty),
-                               DINodeArray(unwrapDI<MDTuple>(Subscripts))));
+  return wrap(unwrap(Builder)->createArrayType(
+      Size, AlignInBits, unwrapDI<DIType>(Ty),
+      DINodeArray(unwrapDI<MDTuple>(Subscripts))));
 }
 
 extern "C" LLVMMetadataRef
-LLVMRustDIBuilderGetOrCreateSubrange(LLVMRustDIBuilderRef Builder, int64_t Lo,
+LLVMRustDIBuilderGetOrCreateSubrange(LLVMDIBuilderRef Builder, int64_t Lo,
                                      int64_t Count) {
-  return wrap(Builder->getOrCreateSubrange(Lo, Count));
+  return wrap(unwrap(Builder)->getOrCreateSubrange(Lo, Count));
 }
 
 extern "C" LLVMMetadataRef
-LLVMRustDIBuilderGetOrCreateArray(LLVMRustDIBuilderRef Builder,
+LLVMRustDIBuilderGetOrCreateArray(LLVMDIBuilderRef Builder,
                                   LLVMMetadataRef *Ptr, unsigned Count) {
   Metadata **DataValue = unwrap(Ptr);
-  return wrap(
-      Builder->getOrCreateArray(ArrayRef<Metadata *>(DataValue, Count)).get());
+  return wrap(unwrap(Builder)
+                  ->getOrCreateArray(ArrayRef<Metadata *>(DataValue, Count))
+                  .get());
 }
 
-extern "C" void LLVMRustDIBuilderInsertDeclareAtEnd(
-    LLVMRustDIBuilderRef Builder, LLVMValueRef V, LLVMMetadataRef VarInfo,
-    uint64_t *AddrOps, unsigned AddrOpsCount, LLVMMetadataRef DL,
-    LLVMBasicBlockRef InsertAtEnd) {
-  Builder->insertDeclare(unwrap(V), unwrap<DILocalVariable>(VarInfo),
-                         Builder->createExpression(
-                             llvm::ArrayRef<uint64_t>(AddrOps, AddrOpsCount)),
-                         DebugLoc(cast<MDNode>(unwrap(DL))),
-                         unwrap(InsertAtEnd));
+extern "C" void
+LLVMRustDIBuilderInsertDeclareAtEnd(LLVMDIBuilderRef Builder, LLVMValueRef V,
+                                    LLVMMetadataRef VarInfo, uint64_t *AddrOps,
+                                    unsigned AddrOpsCount, LLVMMetadataRef DL,
+                                    LLVMBasicBlockRef InsertAtEnd) {
+  unwrap(Builder)->insertDeclare(
+      unwrap(V), unwrap<DILocalVariable>(VarInfo),
+      unwrap(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,
-    const uint64_t Value[2], unsigned SizeInBits, bool IsUnsigned) {
-  return wrap(Builder->createEnumerator(
+extern "C" LLVMMetadataRef
+LLVMRustDIBuilderCreateEnumerator(LLVMDIBuilderRef Builder, const char *Name,
+                                  size_t NameLen, const uint64_t Value[2],
+                                  unsigned SizeInBits, bool IsUnsigned) {
+  return wrap(unwrap(Builder)->createEnumerator(
       StringRef(Name, NameLen),
       APSInt(APInt(SizeInBits, ArrayRef<uint64_t>(Value, 2)), IsUnsigned)));
 }
 
 extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateEnumerationType(
-    LLVMRustDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
+    LLVMDIBuilderRef 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(
+  return wrap(unwrap(Builder)->createEnumerationType(
       unwrapDI<DIDescriptor>(Scope), StringRef(Name, NameLen),
       unwrapDI<DIFile>(File), LineNumber, SizeInBits, AlignInBits,
       DINodeArray(unwrapDI<MDTuple>(Elements)), unwrapDI<DIType>(ClassTy),
@@ -1176,12 +1263,12 @@ extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateEnumerationType(
 }
 
 extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateUnionType(
-    LLVMRustDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
+    LLVMDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
     size_t NameLen, LLVMMetadataRef File, unsigned LineNumber,
-    uint64_t SizeInBits, uint32_t AlignInBits, LLVMRustDIFlags Flags,
+    uint64_t SizeInBits, uint32_t AlignInBits, LLVMDIFlags Flags,
     LLVMMetadataRef Elements, unsigned RunTimeLang, const char *UniqueId,
     size_t UniqueIdLen) {
-  return wrap(Builder->createUnionType(
+  return wrap(unwrap(Builder)->createUnionType(
       unwrapDI<DIDescriptor>(Scope), StringRef(Name, NameLen),
       unwrapDI<DIFile>(File), LineNumber, SizeInBits, AlignInBits,
       fromRust(Flags), DINodeArray(unwrapDI<MDTuple>(Elements)), RunTimeLang,
@@ -1189,50 +1276,28 @@ extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateUnionType(
 }
 
 extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateTemplateTypeParameter(
-    LLVMRustDIBuilderRef Builder, LLVMMetadataRef Scope, const char *Name,
+    LLVMDIBuilderRef 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(
+  return wrap(unwrap(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,
+    LLVMDIBuilderRef Builder, LLVMMetadataRef CompositeTy,
     LLVMMetadataRef Elements, LLVMMetadataRef Params) {
   DICompositeType *Tmp = unwrapDI<DICompositeType>(CompositeTy);
-  Builder->replaceArrays(Tmp, DINodeArray(unwrap<MDTuple>(Elements)),
-                         DINodeArray(unwrap<MDTuple>(Params)));
+  unwrap(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" int64_t LLVMRustDIBuilderCreateOpLLVMFragment() {
-  return dwarf::DW_OP_LLVM_fragment;
+LLVMRustDILocationCloneWithBaseDiscriminator(LLVMMetadataRef Location,
+                                             unsigned BD) {
+  DILocation *Loc = unwrapDIPtr<DILocation>(Location);
+  auto NewLoc = Loc->cloneWithBaseDiscriminator(BD);
+  return wrap(NewLoc.has_value() ? NewLoc.value() : nullptr);
 }
 
 extern "C" void LLVMRustWriteTypeToString(LLVMTypeRef Ty, RustStringRef Str) {
@@ -1445,7 +1510,7 @@ extern "C" LLVMTypeKind LLVMRustGetTypeKind(LLVMTypeRef Ty) {
 DEFINE_SIMPLE_CONVERSION_FUNCTIONS(SMDiagnostic, LLVMSMDiagnosticRef)
 
 extern "C" LLVMSMDiagnosticRef LLVMRustGetSMDiagnostic(LLVMDiagnosticInfoRef DI,
-                                                       unsigned *Cookie) {
+                                                       uint64_t *Cookie) {
   llvm::DiagnosticInfoSrcMgr *SM =
       static_cast<llvm::DiagnosticInfoSrcMgr *>(unwrap(DI));
   *Cookie = SM->getLocCookie();
@@ -1484,8 +1549,8 @@ LLVMRustUnpackSMDiagnostic(LLVMSMDiagnosticRef DRef, RustStringRef MessageOut,
   const SourceMgr &LSM = *D.getSourceMgr();
   const MemoryBuffer *LBuf =
       LSM.getMemoryBuffer(LSM.FindBufferContainingLoc(D.getLoc()));
-  LLVMRustStringWriteImpl(BufferOut, LBuf->getBufferStart(),
-                          LBuf->getBufferSize());
+  auto BufferOS = RawRustStringOstream(BufferOut);
+  BufferOS << LBuf->getBuffer();
 
   *LocOut = D.getLoc().getPointer() - LBuf->getBufferStart();
 
@@ -1499,77 +1564,6 @@ LLVMRustUnpackSMDiagnostic(LLVMSMDiagnosticRef DRef, RustStringRef MessageOut,
   return true;
 }
 
-extern "C" OperandBundleDef *LLVMRustBuildOperandBundleDef(const char *Name,
-                                                           LLVMValueRef *Inputs,
-                                                           unsigned NumInputs) {
-  return new OperandBundleDef(Name,
-                              ArrayRef<Value *>(unwrap(Inputs), NumInputs));
-}
-
-extern "C" void LLVMRustFreeOperandBundleDef(OperandBundleDef *Bundle) {
-  delete Bundle;
-}
-
-// OpBundlesIndirect is an array of pointers (*not* a pointer to an array).
-extern "C" LLVMValueRef LLVMRustBuildCall(LLVMBuilderRef B, LLVMTypeRef Ty,
-                                          LLVMValueRef Fn, LLVMValueRef *Args,
-                                          unsigned NumArgs,
-                                          OperandBundleDef **OpBundlesIndirect,
-                                          unsigned NumOpBundles) {
-  Value *Callee = unwrap(Fn);
-  FunctionType *FTy = unwrap<FunctionType>(Ty);
-
-  // FIXME: Is there a way around this?
-  SmallVector<OperandBundleDef> OpBundles;
-  OpBundles.reserve(NumOpBundles);
-  for (unsigned i = 0; i < NumOpBundles; ++i) {
-    OpBundles.push_back(*OpBundlesIndirect[i]);
-  }
-
-  return wrap(unwrap(B)->CreateCall(FTy, Callee,
-                                    ArrayRef<Value *>(unwrap(Args), NumArgs),
-                                    ArrayRef<OperandBundleDef>(OpBundles)));
-}
-
-extern "C" LLVMValueRef
-LLVMRustGetInstrProfIncrementIntrinsic(LLVMModuleRef M) {
-#if LLVM_VERSION_GE(20, 0)
-  return wrap(llvm::Intrinsic::getOrInsertDeclaration(
-      unwrap(M), llvm::Intrinsic::instrprof_increment));
-#else
-  return wrap(llvm::Intrinsic::getDeclaration(
-      unwrap(M), llvm::Intrinsic::instrprof_increment));
-#endif
-}
-
-extern "C" LLVMValueRef
-LLVMRustGetInstrProfMCDCParametersIntrinsic(LLVMModuleRef M) {
-#if LLVM_VERSION_LT(19, 0)
-  report_fatal_error("LLVM 19.0 is required for mcdc intrinsic functions");
-#endif
-#if LLVM_VERSION_GE(20, 0)
-  return wrap(llvm::Intrinsic::getOrInsertDeclaration(
-      unwrap(M), llvm::Intrinsic::instrprof_mcdc_parameters));
-#else
-  return wrap(llvm::Intrinsic::getDeclaration(
-      unwrap(M), llvm::Intrinsic::instrprof_mcdc_parameters));
-#endif
-}
-
-extern "C" LLVMValueRef
-LLVMRustGetInstrProfMCDCTVBitmapUpdateIntrinsic(LLVMModuleRef M) {
-#if LLVM_VERSION_LT(19, 0)
-  report_fatal_error("LLVM 19.0 is required for mcdc intrinsic functions");
-#endif
-#if LLVM_VERSION_GE(20, 0)
-  return wrap(llvm::Intrinsic::getOrInsertDeclaration(
-      unwrap(M), llvm::Intrinsic::instrprof_mcdc_tvbitmap_update));
-#else
-  return wrap(llvm::Intrinsic::getDeclaration(
-      unwrap(M), llvm::Intrinsic::instrprof_mcdc_tvbitmap_update));
-#endif
-}
-
 extern "C" LLVMValueRef LLVMRustBuildMemCpy(LLVMBuilderRef B, LLVMValueRef Dst,
                                             unsigned DstAlign, LLVMValueRef Src,
                                             unsigned SrcAlign,
@@ -1597,157 +1591,12 @@ extern "C" LLVMValueRef LLVMRustBuildMemSet(LLVMBuilderRef B, LLVMValueRef Dst,
                                       MaybeAlign(DstAlign), IsVolatile));
 }
 
-// OpBundlesIndirect is an array of pointers (*not* a pointer to an array).
-extern "C" LLVMValueRef
-LLVMRustBuildInvoke(LLVMBuilderRef B, LLVMTypeRef Ty, LLVMValueRef Fn,
-                    LLVMValueRef *Args, unsigned NumArgs,
-                    LLVMBasicBlockRef Then, LLVMBasicBlockRef Catch,
-                    OperandBundleDef **OpBundlesIndirect, unsigned NumOpBundles,
-                    const char *Name) {
-  Value *Callee = unwrap(Fn);
-  FunctionType *FTy = unwrap<FunctionType>(Ty);
-
-  // FIXME: Is there a way around this?
-  SmallVector<OperandBundleDef> OpBundles;
-  OpBundles.reserve(NumOpBundles);
-  for (unsigned i = 0; i < NumOpBundles; ++i) {
-    OpBundles.push_back(*OpBundlesIndirect[i]);
-  }
-
-  return wrap(unwrap(B)->CreateInvoke(FTy, Callee, unwrap(Then), unwrap(Catch),
-                                      ArrayRef<Value *>(unwrap(Args), NumArgs),
-                                      ArrayRef<OperandBundleDef>(OpBundles),
-                                      Name));
-}
-
-// OpBundlesIndirect is an array of pointers (*not* a pointer to an array).
-extern "C" LLVMValueRef
-LLVMRustBuildCallBr(LLVMBuilderRef B, LLVMTypeRef Ty, LLVMValueRef Fn,
-                    LLVMBasicBlockRef DefaultDest,
-                    LLVMBasicBlockRef *IndirectDests, unsigned NumIndirectDests,
-                    LLVMValueRef *Args, unsigned NumArgs,
-                    OperandBundleDef **OpBundlesIndirect, unsigned NumOpBundles,
-                    const char *Name) {
-  Value *Callee = unwrap(Fn);
-  FunctionType *FTy = unwrap<FunctionType>(Ty);
-
-  // FIXME: Is there a way around this?
-  std::vector<BasicBlock *> IndirectDestsUnwrapped;
-  IndirectDestsUnwrapped.reserve(NumIndirectDests);
-  for (unsigned i = 0; i < NumIndirectDests; ++i) {
-    IndirectDestsUnwrapped.push_back(unwrap(IndirectDests[i]));
-  }
-
-  // FIXME: Is there a way around this?
-  SmallVector<OperandBundleDef> OpBundles;
-  OpBundles.reserve(NumOpBundles);
-  for (unsigned i = 0; i < NumOpBundles; ++i) {
-    OpBundles.push_back(*OpBundlesIndirect[i]);
-  }
-
-  return wrap(
-      unwrap(B)->CreateCallBr(FTy, Callee, unwrap(DefaultDest),
-                              ArrayRef<BasicBlock *>(IndirectDestsUnwrapped),
-                              ArrayRef<Value *>(unwrap(Args), NumArgs),
-                              ArrayRef<OperandBundleDef>(OpBundles), 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 = Triple(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" bool LLVMRustConstIntGetZExtValue(LLVMValueRef CV, uint64_t *value) {
   auto C = unwrap<llvm::ConstantInt>(CV);
   if (C->getBitWidth() > 64)
@@ -1775,45 +1624,6 @@ extern "C" bool LLVMRustConstInt128Get(LLVMValueRef CV, bool sext,
   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));
-}
-
-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);
 }
@@ -1924,56 +1734,6 @@ extern "C" LLVMValueRef LLVMRustBuildMaxNum(LLVMBuilderRef B, LLVMValueRef LHS,
   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
-#if LLVM_VERSION_GE(19, 0)
-        std::string{}, // ExportAs
-#endif
-        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;
-    auto stream = llvm::raw_string_ostream(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) {
@@ -2041,11 +1801,7 @@ extern "C" void LLVMRustContextConfigureDiagnosticHandler(
         }
       }
       if (DiagnosticHandlerCallback) {
-#if LLVM_VERSION_GE(19, 0)
         DiagnosticHandlerCallback(&DI, DiagnosticHandlerContext);
-#else
-        DiagnosticHandlerCallback(DI, DiagnosticHandlerContext);
-#endif
         return true;
       }
       return false;
@@ -2156,10 +1912,6 @@ extern "C" int32_t LLVMRustGetElementTypeArgIndex(LLVMValueRef CallSite) {
   return -1;
 }
 
-extern "C" bool LLVMRustIsBitcode(char *ptr, size_t len) {
-  return identify_magic(StringRef(ptr, len)) == file_magic::bitcode;
-}
-
 extern "C" bool LLVMRustIsNonGVFunctionPointerTy(LLVMValueRef V) {
   if (unwrap<Value>(V)->getType()->isPointerTy()) {
     if (auto *GV = dyn_cast<GlobalValue>(unwrap<Value>(V))) {
@@ -2179,20 +1931,21 @@ extern "C" bool LLVMRustLLVMHasZstdCompressionForDebugSymbols() {
   return llvm::compression::zstd::isAvailable();
 }
 
-// Operations on composite constants.
-// These are clones of LLVM api functions that will become available in future
-// releases. They can be removed once Rust's minimum supported LLVM version
-// supports them. See https://github.com/rust-lang/rust/issues/121868 See
-// https://llvm.org/doxygen/group__LLVMCCoreValueConstantComposite.html
+extern "C" void LLVMRustSetNoSanitizeAddress(LLVMValueRef Global) {
+  GlobalValue &GV = *unwrap<GlobalValue>(Global);
+  GlobalValue::SanitizerMetadata MD;
+  if (GV.hasSanitizerMetadata())
+    MD = GV.getSanitizerMetadata();
+  MD.NoAddress = true;
+  MD.IsDynInit = false;
+  GV.setSanitizerMetadata(MD);
+}
 
-// FIXME: Remove when Rust's minimum supported LLVM version reaches 19.
-// https://github.com/llvm/llvm-project/commit/e1405e4f71c899420ebf8262d5e9745598419df8
-#if LLVM_VERSION_LT(19, 0)
-extern "C" LLVMValueRef LLVMConstStringInContext2(LLVMContextRef C,
-                                                  const char *Str,
-                                                  size_t Length,
-                                                  bool DontNullTerminate) {
-  return wrap(ConstantDataArray::getString(*unwrap(C), StringRef(Str, Length),
-                                           !DontNullTerminate));
+extern "C" void LLVMRustSetNoSanitizeHWAddress(LLVMValueRef Global) {
+  GlobalValue &GV = *unwrap<GlobalValue>(Global);
+  GlobalValue::SanitizerMetadata MD;
+  if (GV.hasSanitizerMetadata())
+    MD = GV.getSanitizerMetadata();
+  MD.NoHWAddress = true;
+  GV.setSanitizerMetadata(MD);
 }
-#endif
diff --git a/compiler/rustc_llvm/llvm-wrapper/SymbolWrapper.cpp b/compiler/rustc_llvm/llvm-wrapper/SymbolWrapper.cpp
index 54ee79dc290..a910e78d489 100644
--- a/compiler/rustc_llvm/llvm-wrapper/SymbolWrapper.cpp
+++ b/compiler/rustc_llvm/llvm-wrapper/SymbolWrapper.cpp
@@ -8,14 +8,14 @@
 // * https://github.com/llvm/llvm-project/blob/ef6d1ec07c693352c4a60dd58db08d2d8558f6ea/llvm/lib/Object/ArchiveWriter.cpp
 
 #include "LLVMWrapper.h"
-#include "SuppressLLVMWarnings.h"
+
 #include "llvm/ADT/SmallString.h"
 #include "llvm/IR/LLVMContext.h"
 #include "llvm/Object/COFF.h"
 #include "llvm/Object/COFFImportFile.h"
 #include "llvm/Object/IRObjectFile.h"
 #include "llvm/Object/ObjectFile.h"
-#include <llvm/Support/raw_ostream.h>
+#include "llvm/Support/raw_ostream.h"
 
 using namespace llvm;
 using namespace llvm::sys;