Merge branch 'llvm:main' into gh-101657

Author: ravindra-shinde2

.ci/monolithic-linux.sh

@@ -33,6 +33,7 @@ function at-exit {
 
   mkdir -p artifacts
   ccache --print-stats > artifacts/ccache_stats.txt
+  cp "${BUILD_DIR}"/.ninja_log artifacts/.ninja_log
 
   # If building fails there will be no results files.
   shopt -s nullglob

.ci/monolithic-windows.sh

@@ -32,6 +32,7 @@ function at-exit {
 
   mkdir -p artifacts
   sccache --show-stats >> artifacts/sccache_stats.txt
+  cp "${BUILD_DIR}"/.ninja_log artifacts/.ninja_log
 
   # If building fails there will be no results files.
   shopt -s nullglob

.github/workflows/libcxx-build-and-test.yaml

@@ -216,7 +216,8 @@ jobs:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       - uses: maxim-lobanov/setup-xcode@60606e260d2fc5762a71e64e74b2174e8ea3c8bd # v1.6.0
         with:
-          xcode-version: 'latest'
+          # https://github.com/actions/runner-images/blob/main/images/macos/macos-15-Readme.md
+          xcode-version: '16.3'
       - uses: seanmiddleditch/gha-setup-ninja@3b1f8f94a2f8254bd26914c4ab9474d4f0015f67 # v6
       - name: Build and test
         run: |

.github/workflows/premerge.yaml

@@ -65,6 +65,14 @@ jobs:
           export CXX=/opt/llvm/bin/clang++
 
           ./.ci/monolithic-linux.sh "${projects_to_build}" "${project_check_targets}" "${runtimes_to_build}" "${runtimes_check_targets}"
+            - name: "Upload artifact"
+      - name: Upload Artifacts
+        uses: actions/upload-artifact@65c4c4a1ddee5b72f698fdd19549f0f0fb45cf08 # v4.6.0
+        with:
+          name: Premerge Artifacts
+          path: artifacts/
+          retention-days: 5
+          include-hidden-files: 'true'
 
   premerge-checks-windows:
     name: Windows Premerge Checks (Test Only - Please Ignore Results)
@@ -113,6 +121,13 @@ jobs:
           set MAX_PARALLEL_LINK_JOBS=64
           call C:\\BuildTools\\Common7\\Tools\\VsDevCmd.bat -arch=amd64 -host_arch=amd64
           bash .ci/monolithic-windows.sh "${{ steps.vars.outputs.windows-projects }}" "${{ steps.vars.outputs.windows-check-targets }}"
+      - name: Upload Artifacts
+        uses: actions/upload-artifact@65c4c4a1ddee5b72f698fdd19549f0f0fb45cf08 # v4.6.0
+        with:
+          name: Premerge Artifacts
+          path: artifacts/
+          retention-days: 5
+          include-hidden-files: 'true'
 
   premerge-check-macos:
     name: MacOS Premerge Checks

.mailmap

@@ -49,6 +49,6 @@ Ramkumar Ramachandra <[email protected]> <[email protected]>
 Ramkumar Ramachandra <[email protected]> <[email protected]>
 Saleem Abdulrasool <[email protected]>
 Tommy Chiang <[email protected]> <[email protected]>
-Wang Pengcheng <[email protected]>
-Wang Pengcheng <[email protected]> <[email protected]>
-Wang Pengcheng <[email protected]> <[email protected]>
+Pengcheng Wang <[email protected]>
+Pengcheng Wang <[email protected]> <[email protected]>
+Pengcheng Wang <[email protected]> <[email protected]>

bolt/lib/Core/Relocation.cpp

@@ -96,6 +96,7 @@ static bool isSupportedAArch64(uint32_t Type) {
   case ELF::R_AARCH64_MOVW_UABS_G2:
   case ELF::R_AARCH64_MOVW_UABS_G2_NC:
   case ELF::R_AARCH64_MOVW_UABS_G3:
+  case ELF::R_AARCH64_PLT32:
     return true;
   }
 }
@@ -202,6 +203,7 @@ static size_t getSizeForTypeAArch64(uint32_t Type) {
   case ELF::R_AARCH64_MOVW_UABS_G2_NC:
   case ELF::R_AARCH64_MOVW_UABS_G3:
   case ELF::R_AARCH64_ABS32:
+  case ELF::R_AARCH64_PLT32:
     return 4;
   case ELF::R_AARCH64_ABS64:
   case ELF::R_AARCH64_PREL64:
@@ -354,6 +356,7 @@ static uint64_t extractValueAArch64(uint32_t Type, uint64_t Contents,
   case ELF::R_AARCH64_PREL16:
     return static_cast<int64_t>(PC) + SignExtend64<16>(Contents & 0xffff);
   case ELF::R_AARCH64_PREL32:
+  case ELF::R_AARCH64_PLT32:
     return static_cast<int64_t>(PC) + SignExtend64<32>(Contents & 0xffffffff);
   case ELF::R_AARCH64_PREL64:
     return static_cast<int64_t>(PC) + Contents;
@@ -676,6 +679,7 @@ static bool isPCRelativeAArch64(uint32_t Type) {
   case ELF::R_AARCH64_PREL16:
   case ELF::R_AARCH64_PREL32:
   case ELF::R_AARCH64_PREL64:
+  case ELF::R_AARCH64_PLT32:
     return true;
   }
 }

bolt/lib/Rewrite/RewriteInstance.cpp

@@ -2603,7 +2603,9 @@ void RewriteInstance::readRelocations(const SectionRef &Section) {
 void RewriteInstance::handleRelocation(const SectionRef &RelocatedSection,
                                        const RelocationRef &Rel) {
   const bool IsAArch64 = BC->isAArch64();
+  const bool IsX86 = BC->isX86();
   const bool IsFromCode = RelocatedSection.isText();
+  const bool IsWritable = BinarySection(*BC, RelocatedSection).isWritable();
 
   SmallString<16> TypeName;
   Rel.getTypeName(TypeName);
@@ -2612,15 +2614,15 @@ void RewriteInstance::handleRelocation(const SectionRef &RelocatedSection,
     return;
 
   // Adjust the relocation type as the linker might have skewed it.
-  if (BC->isX86() && (RType & ELF::R_X86_64_converted_reloc_bit)) {
+  if (IsX86 && (RType & ELF::R_X86_64_converted_reloc_bit)) {
     if (opts::Verbosity >= 1)
       dbgs() << "BOLT-WARNING: ignoring R_X86_64_converted_reloc_bit\n";
     RType &= ~ELF::R_X86_64_converted_reloc_bit;
   }
 
   if (Relocation::isTLS(RType)) {
     // No special handling required for TLS relocations on X86.
-    if (BC->isX86())
+    if (IsX86)
       return;
 
     // The non-got related TLS relocations on AArch64 and RISC-V also could be
@@ -2661,6 +2663,30 @@ void RewriteInstance::handleRelocation(const SectionRef &RelocatedSection,
     return;
   }
 
+  if (!IsFromCode && !IsWritable && (IsX86 || IsAArch64) &&
+      Relocation::isPCRelative(RType)) {
+    BinaryData *BD = BC->getBinaryDataContainingAddress(Rel.getOffset());
+    if (BD && (BD->nameStartsWith("_ZTV") ||   // vtable
+               BD->nameStartsWith("_ZTCN"))) { // construction vtable
+      BinaryFunction *BF = BC->getBinaryFunctionContainingAddress(
+          SymbolAddress, /*CheckPastEnd*/ false, /*UseMaxSize*/ true);
+      if (!BF || BF->getAddress() != SymbolAddress) {
+        BC->errs()
+            << "BOLT-ERROR: the virtual function table entry at offset 0x"
+            << Twine::utohexstr(Rel.getOffset());
+        if (BF)
+          BC->errs() << " points to the middle of a function @ 0x"
+                     << Twine::utohexstr(BF->getAddress()) << "\n";
+        else
+          BC->errs() << " does not point to any function\n";
+        exit(1);
+      }
+      BC->addRelocation(Rel.getOffset(), BF->getSymbol(), RType, Addend,
+                        ExtractedValue);
+      return;
+    }
+  }
+
   const uint64_t Address = SymbolAddress + Addend;
 
   LLVM_DEBUG({
@@ -2724,7 +2750,7 @@ void RewriteInstance::handleRelocation(const SectionRef &RelocatedSection,
   const bool IsToCode = ReferencedSection && ReferencedSection->isText();
 
   // Special handling of PC-relative relocations.
-  if (BC->isX86() && Relocation::isPCRelative(RType)) {
+  if (IsX86 && Relocation::isPCRelative(RType)) {
     if (!IsFromCode && IsToCode) {
       // PC-relative relocations from data to code are tricky since the
       // original information is typically lost after linking, even with

bolt/test/runtime/relative-vftable.cpp

@@ -0,0 +1,57 @@
+// Test BOLT is able to handle relative virtual function table, i.e., when
+// code is compiled with `-fexperimental-relative-c++-abi-vtables`.
+
+// REQUIRES: system-linux
+
+// RUN: split-file %s %t
+// RUN: %clang -fuse-ld=lld -o %t/main.so %t/tt.cpp %t/main.cpp -Wl,-q \
+// RUN:     -fno-rtti -fexperimental-relative-c++-abi-vtables
+// RUN: %t/main.so | FileCheck %s
+
+// CHECK: derived_foo
+// CHECK-NEXT: derived_bar
+// CHECK-NEXT: derived_goo
+
+// RUN: llvm-bolt %t/main.so -o %t/main.bolted.so --trap-old-code
+// RUN: %t/main.bolted.so | FileCheck %s
+
+;--- tt.h
+#include <stdio.h>
+
+class Base {
+public:
+  virtual void foo();
+  virtual void bar();
+  virtual void goo();
+};
+
+class Derived : public Base {
+public:
+  virtual void foo() override;
+  virtual void bar() override;
+  virtual void goo() override;
+};
+
+;--- tt.cpp
+#include "tt.h"
+void Derived::goo() { printf("derived_goo\n"); }
+
+;--- main.cpp
+#include "tt.h"
+#pragma clang optimize off
+
+void Base::foo() { printf("base_foo\n"); }
+void Base::bar() { printf("base_bar\n"); }
+void Base::goo() { printf("base_goo\n"); }
+
+void Derived::foo() { printf("derived_foo\n"); }
+void Derived::bar() { printf("derived_bar\n"); }
+
+int main() {
+  Derived D;
+  Base *ptr = &D;
+  ptr->foo();
+  ptr->bar();
+  ptr->goo();
+  return 0;
+}

clang-tools-extra/clang-doc/Mapper.cpp

@@ -19,7 +19,7 @@ namespace clang {
 namespace doc {
 
 static llvm::StringSet<> USRVisited;
-static llvm::sys::Mutex USRVisitedGuard;
+static llvm::sys::SmartMutex<true> USRVisitedGuard;
 
 template <typename T> bool isTypedefAnonRecord(const T *D) {
   if (const auto *C = dyn_cast<CXXRecordDecl>(D)) {
@@ -48,7 +48,7 @@ bool MapASTVisitor::mapDecl(const T *D, bool IsDefinition) {
     return true;
   // Prevent Visiting USR twice
   {
-    std::lock_guard<llvm::sys::Mutex> Guard(USRVisitedGuard);
+    llvm::sys::SmartScopedLock<true> Guard(USRVisitedGuard);
     StringRef Visited = USR.str();
     if (USRVisited.count(Visited) && !isTypedefAnonRecord<T>(D))
       return true;

clang-tools-extra/clang-tidy/readability/StaticAccessedThroughInstanceCheck.cpp

@@ -69,7 +69,7 @@ void StaticAccessedThroughInstanceCheck::check(
   PrintingPolicyWithSuppressedTag.SuppressTagKeyword = true;
   PrintingPolicyWithSuppressedTag.SuppressUnwrittenScope = true;
 
-  PrintingPolicyWithSuppressedTag.PrintCanonicalTypes =
+  PrintingPolicyWithSuppressedTag.PrintAsCanonical =
       !BaseExpr->getType()->isTypedefNameType();
 
   std::string BaseTypeName =