Merge branch 'main' into reland-m-prefetch

Author: rnk

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

@@ -37,7 +37,7 @@ jobs:
   stage1:
     if: github.repository_owner == 'llvm'
     runs-on: libcxx-self-hosted-linux
-    container: ghcr.io/llvm/libcxx-linux-builder:b6bb9dc5abd7c6452c13a53fa8949cb259db459b
+    container: ghcr.io/llvm/libcxx-linux-builder:2b57ebb50b6d418e70382e655feaa619b558e254
     continue-on-error: false
     strategy:
       fail-fast: false
@@ -75,7 +75,7 @@ jobs:
   stage2:
     if: github.repository_owner == 'llvm'
     runs-on: libcxx-self-hosted-linux
-    container: ghcr.io/llvm/libcxx-linux-builder:b6bb9dc5abd7c6452c13a53fa8949cb259db459b
+    container: ghcr.io/llvm/libcxx-linux-builder:2b57ebb50b6d418e70382e655feaa619b558e254
     needs: [ stage1 ]
     continue-on-error: false
     strategy:
@@ -163,7 +163,7 @@ jobs:
         - config: 'generic-msan'
           machine: libcxx-self-hosted-linux
     runs-on: ${{ matrix.machine }}
-    container: ghcr.io/llvm/libcxx-linux-builder:b6bb9dc5abd7c6452c13a53fa8949cb259db459b
+    container: ghcr.io/llvm/libcxx-linux-builder:2b57ebb50b6d418e70382e655feaa619b558e254
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       - name: ${{ matrix.config }}

CONTRIBUTING.md

@@ -9,9 +9,8 @@ describes how to get involved, raise issues and submit patches.
 
 ## Getting in touch
 
-Join the [LLVM Discourse forums](https://discourse.llvm.org/), [Discord
-chat](https://discord.gg/xS7Z362), or #llvm IRC channel on
-[OFTC](https://oftc.net/).
+Join the [LLVM Discourse forums](https://discourse.llvm.org/) or [Discord
+chat](https://discord.gg/xS7Z362).
 
 The LLVM project has adopted a [code of conduct](https://llvm.org/docs/CodeOfConduct.html) for
 participants to all modes of communication within the project.

bolt/Maintainers.txt

@@ -5,9 +5,8 @@ what goes in or not.
 
 The list is sorted by surname and formatted to allow easy grepping and
 beautification by scripts. The fields are: name (N), email (E), web-address
-(W), PGP key ID and fingerprint (P), description (D), snail-mail address
-(S) and (I) IRC handle. Each entry should contain at least the (N), (E) and
-(D) fields.
+(W), PGP key ID and fingerprint (P), and description (D). Each entry should
+contain at least the (N), (E) and (D) fields.
 
 N: Maksim Panchenko, Rafael Auler
 E: [email protected], [email protected]

bolt/include/bolt/Profile/DataAggregator.h

@@ -197,10 +197,6 @@ class DataAggregator : public DataReader {
 
   BoltAddressTranslation *BAT{nullptr};
 
-  /// Whether pre-aggregated profile needs to convert branch profile into call
-  /// to continuation fallthrough profile.
-  bool NeedsConvertRetProfileToCallCont{false};
-
   /// Update function execution profile with a recorded trace.
   /// A trace is region of code executed between two LBR entries supplied in
   /// execution order.

bolt/lib/Profile/DataAggregator.cpp

@@ -720,23 +720,6 @@ bool DataAggregator::doBranch(uint64_t From, uint64_t To, uint64_t Count,
                : isReturn(Func.disassembleInstructionAtOffset(Offset));
   };
 
-  // Returns whether \p Offset in \p Func may be a call continuation excluding
-  // entry points and landing pads.
-  auto checkCallCont = [&](const BinaryFunction &Func, const uint64_t Offset) {
-    // No call continuation at a function start.
-    if (!Offset)
-      return false;
-
-    // FIXME: support BAT case where the function might be in empty state
-    // (split fragments declared non-simple).
-    if (!Func.hasCFG())
-      return false;
-
-    // The offset should not be an entry point or a landing pad.
-    const BinaryBasicBlock *ContBB = Func.getBasicBlockAtOffset(Offset);
-    return ContBB && !ContBB->isEntryPoint() && !ContBB->isLandingPad();
-  };
-
   // Mutates \p Addr to an offset into the containing function, performing BAT
   // offset translation and parent lookup.
   //
@@ -749,8 +732,7 @@ bool DataAggregator::doBranch(uint64_t From, uint64_t To, uint64_t Count,
 
     Addr -= Func->getAddress();
 
-    bool IsRetOrCallCont =
-        IsFrom ? checkReturn(*Func, Addr) : checkCallCont(*Func, Addr);
+    bool IsRet = IsFrom && checkReturn(*Func, Addr);
 
     if (BAT)
       Addr = BAT->translate(Func->getAddress(), Addr, IsFrom);
@@ -761,24 +743,16 @@ bool DataAggregator::doBranch(uint64_t From, uint64_t To, uint64_t Count,
       NumColdSamples += Count;
 
     if (!ParentFunc)
-      return std::pair{Func, IsRetOrCallCont};
+      return std::pair{Func, IsRet};
 
-    return std::pair{ParentFunc, IsRetOrCallCont};
+    return std::pair{ParentFunc, IsRet};
   };
 
-  uint64_t ToOrig = To;
   auto [FromFunc, IsReturn] = handleAddress(From, /*IsFrom*/ true);
-  auto [ToFunc, IsCallCont] = handleAddress(To, /*IsFrom*/ false);
+  auto [ToFunc, _] = handleAddress(To, /*IsFrom*/ false);
   if (!FromFunc && !ToFunc)
     return false;
 
-  // Record call to continuation trace.
-  if (NeedsConvertRetProfileToCallCont && FromFunc != ToFunc &&
-      (IsReturn || IsCallCont)) {
-    LBREntry First{ToOrig - 1, ToOrig - 1, false};
-    LBREntry Second{ToOrig, ToOrig, false};
-    return doTrace(First, Second, Count);
-  }
   // Ignore returns.
   if (IsReturn)
     return true;
@@ -1235,21 +1209,14 @@ std::error_code DataAggregator::parseAggregatedLBREntry() {
   ErrorOr<StringRef> TypeOrErr = parseString(FieldSeparator);
   if (std::error_code EC = TypeOrErr.getError())
     return EC;
-  // Pre-aggregated profile with branches and fallthroughs needs to convert
-  // return profile into call to continuation fall-through.
-  auto Type = AggregatedLBREntry::BRANCH;
-  if (TypeOrErr.get() == "B") {
-    NeedsConvertRetProfileToCallCont = true;
+  auto Type = AggregatedLBREntry::TRACE;
+  if (LLVM_LIKELY(TypeOrErr.get() == "T")) {
+  } else if (TypeOrErr.get() == "B") {
     Type = AggregatedLBREntry::BRANCH;
   } else if (TypeOrErr.get() == "F") {
-    NeedsConvertRetProfileToCallCont = true;
     Type = AggregatedLBREntry::FT;
   } else if (TypeOrErr.get() == "f") {
-    NeedsConvertRetProfileToCallCont = true;
     Type = AggregatedLBREntry::FT_EXTERNAL_ORIGIN;
-  } else if (TypeOrErr.get() == "T") {
-    // Trace is expanded into B and [Ff]
-    Type = AggregatedLBREntry::TRACE;
   } else {
     reportError("expected T, B, F or f");
     return make_error_code(llvm::errc::io_error);

bolt/test/X86/callcont-fallthru.s

@@ -4,31 +4,12 @@
 # RUN: %clang %cflags -fpic -shared -xc /dev/null -o %t.so
 ## Link against a DSO to ensure PLT entries.
 # RUN: %clangxx %cxxflags %s %t.so -o %t -Wl,-q -nostdlib
-# RUN: link_fdata %s %t %t.pa1 PREAGG1
-# RUN: link_fdata %s %t %t.pa2 PREAGG2
-# RUN: link_fdata %s %t %t.pa3 PREAGG3
 # RUN: link_fdata %s %t %t.pat PREAGGT1
 # RUN: link_fdata %s %t %t.pat2 PREAGGT2
 # RUN: link_fdata %s %t %t.patplt PREAGGPLT
 
-## Check normal case: fallthrough is not LP or secondary entry.
 # RUN: llvm-strip --strip-unneeded %t -o %t.strip
 # RUN: llvm-objcopy --remove-section=.eh_frame %t.strip %t.noeh
-# RUN: llvm-bolt %t.strip --pa -p %t.pa1 -o %t.out \
-# RUN:   --print-cfg --print-only=main | FileCheck %s
-
-## Check that getFallthroughsInTrace correctly handles a trace starting at plt
-## call continuation
-# RUN: llvm-bolt %t.strip --pa -p %t.pa2 -o %t.out2 \
-# RUN:   --print-cfg --print-only=main | FileCheck %s --check-prefix=CHECK2
-
-## Check that we don't treat secondary entry points as call continuation sites.
-# RUN: llvm-bolt %t --pa -p %t.pa3 -o %t.out \
-# RUN:   --print-cfg --print-only=main | FileCheck %s --check-prefix=CHECK3
-
-## Check fallthrough to a landing pad case.
-# RUN: llvm-bolt %t.strip --pa -p %t.pa3 -o %t.out \
-# RUN:   --print-cfg --print-only=main | FileCheck %s --check-prefix=CHECK3
 
 ## Check pre-aggregated traces attach call continuation fallthrough count
 # RUN: llvm-bolt %t.noeh --pa -p %t.pat -o %t.out \
@@ -77,7 +58,6 @@ Ltmp0_br:
 ## Check PLT traces are accepted
 # PREAGGPLT: T #Ltmp0_br# #puts@plt# #puts@plt# 3
 ## Target is an external-origin call continuation
-# PREAGG1: B X:0 #Ltmp1# 2 0
 # PREAGGT1: T X:0 #Ltmp1# #Ltmp4_br# 2
 # CHECK:      callq puts@PLT
 # CHECK-NEXT: count: 2
@@ -97,18 +77,15 @@ Ltmp4_br:
 	movl	$0xa, -0x18(%rbp)
 	callq	foo
 ## Target is a binary-local call continuation
-# PREAGG1: B #Lfoo_ret# #Ltmp3# 1 0
 # PREAGGT1: T #Lfoo_ret# #Ltmp3# #Ltmp3_br# 1
 # CHECK:      callq foo
 # CHECK-NEXT: count: 1
 
 ## PLT call continuation fallthrough spanning the call
-# PREAGG2: F #Ltmp1# #Ltmp3_br# 3
 # CHECK2:      callq foo
 # CHECK2-NEXT: count: 3
 
 ## Target is a secondary entry point (unstripped) or a landing pad (stripped)
-# PREAGG3: B X:0 #Ltmp3# 2 0
 # PREAGGT2: T X:0 #Ltmp3# #Ltmp3_br# 2
 # CHECK3:      callq foo
 # CHECK3-NEXT: count: 0

clang-tools-extra/Maintainers.txt

@@ -15,7 +15,7 @@ assistance.
 Lead Maintainer
 ---------------
 | Aaron Ballman
-| [email protected] (email), aaron.ballman (Phabricator), AaronBallman (GitHub), AaronBallman (Discourse), aaronballman (Discord), AaronBallman (IRC)
+| [email protected] (email), aaron.ballman (Phabricator), AaronBallman (GitHub), AaronBallman (Discourse), aaronballman (Discord)
 
 
 clang-tidy
@@ -33,7 +33,7 @@ clang-tidy
 clang-query
 -----------
 | Aaron Ballman
-| [email protected] (email), aaron.ballman (Phabricator), AaronBallman (GitHub), AaronBallman (Discourse), aaronballman (Discord), AaronBallman (IRC)
+| [email protected] (email), aaron.ballman (Phabricator), AaronBallman (GitHub), AaronBallman (Discourse), aaronballman (Discord)
 
 
 clang-doc

clang-tools-extra/clang-change-namespace/ChangeNamespace.cpp

@@ -113,7 +113,7 @@ static SourceLocation getStartOfNextLine(SourceLocation Loc,
                                          const SourceManager &SM,
                                          const LangOptions &LangOpts) {
   std::unique_ptr<Lexer> Lex = getLexerStartingFromLoc(Loc, SM, LangOpts);
-  if (!Lex.get())
+  if (!Lex)
     return SourceLocation();
   llvm::SmallVector<char, 16> Line;
   // FIXME: this is a bit hacky to get ReadToEndOfLine work.
@@ -647,9 +647,8 @@ static SourceLocation getLocAfterNamespaceLBrace(const NamespaceDecl *NsDecl,
                                                  const LangOptions &LangOpts) {
   std::unique_ptr<Lexer> Lex =
       getLexerStartingFromLoc(NsDecl->getBeginLoc(), SM, LangOpts);
-  assert(Lex.get() &&
-         "Failed to create lexer from the beginning of namespace.");
-  if (!Lex.get())
+  assert(Lex && "Failed to create lexer from the beginning of namespace.");
+  if (!Lex)
     return SourceLocation();
   Token Tok;
   while (!Lex->LexFromRawLexer(Tok) && Tok.isNot(tok::TokenKind::l_brace)) {

clang-tools-extra/clang-doc/Representation.h

@@ -60,6 +60,7 @@ struct CommentInfo {
   // the vector.
   bool operator<(const CommentInfo &Other) const;
 
+  // TODO: The Kind field should be an enum, so we can switch on it easily.
   SmallString<16>
       Kind; // Kind of comment (FullComment, ParagraphComment, TextComment,
             // InlineCommandComment, HTMLStartTagComment, HTMLEndTagComment,
@@ -415,7 +416,13 @@ struct TypedefInfo : public SymbolInfo {
 
   TypeInfo Underlying;
 
-  // Inidicates if this is a new C++ "using"-style typedef:
+  // Underlying type declaration
+  SmallString<16> TypeDeclaration;
+
+  /// Comment description for the typedef.
+  std::vector<CommentInfo> Description;
+
+  // Indicates if this is a new C++ "using"-style typedef:
   //   using MyVector = std::vector<int>
   // False means it's a C-style typedef:
   //   typedef std::vector<int> MyVector;
@@ -458,7 +465,8 @@ struct EnumValueInfo {
   // constant. This will be empty for implicit enumeration values.
   SmallString<16> ValueExpr;
 
-  std::vector<CommentInfo> Description; /// Comment description of this field.
+  /// Comment description of this field.
+  std::vector<CommentInfo> Description;
 };
 
 // TODO: Expand to allow for documenting templating.
@@ -527,6 +535,7 @@ struct ClangDocContext {
   std::vector<std::string> UserStylesheets;
   // JavaScript files that will be imported in all HTML files.
   std::vector<std::string> JsScripts;
+  // Base directory for remote repositories.
   StringRef Base;
   Index Idx;
 };