[flang] [clang] [mlir] [lldb] [clang-tools-extra] [llvm] [compiler-rt] [Profile] Add binary profile correlation to offload profile metadata at runtime. (PR #69493)

[Fangrui Song via cfe-commits]

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@@ -46,14 +73,38 @@ const char *InstrProfCorrelator::NumCountersAttributeName = "Num Counters";
 
 llvm::Expected<std::unique_ptr<InstrProfCorrelator::Context>>
 InstrProfCorrelator::Context::get(std::unique_ptr<MemoryBuffer> Buffer,
-                                  const object::ObjectFile &Obj) {
+                                  const object::ObjectFile &Obj,
+                                  ProfCorrelatorKind FileKind) {
+  auto C = std::make_unique<Context>();
   auto CountersSection = getInstrProfSection(Obj, IPSK_cnts);
   if (auto Err = CountersSection.takeError())
     return std::move(Err);
-  auto C = std::make_unique<Context>();
+  if (FileKind == InstrProfCorrelator::BINARY) {
+    auto DataSection = getInstrProfSection(Obj, IPSK_data);
+    if (auto Err = DataSection.takeError())
+      return std::move(Err);
+    auto DataOrErr = DataSection->getContents();
+    if (!DataOrErr)
+      return DataOrErr.takeError();
+    auto NameSection = getInstrProfSection(Obj, IPSK_name);
+    if (auto Err = NameSection.takeError())
+      return std::move(Err);
+    auto NameOrErr = NameSection->getContents();
+    if (!NameOrErr)
+      return NameOrErr.takeError();
+    C->DataStart = DataOrErr->data();
+    C->DataEnd = DataOrErr->data() + DataOrErr->size();
+    C->NameStart = NameOrErr->data();
+    C->NameSize = NameOrErr->size();
+  }
   C->Buffer = std::move(Buffer);
   C->CountersSectionStart = CountersSection->getAddress();
   C->CountersSectionEnd = C->CountersSectionStart + CountersSection->getSize();
+  // In COFF object file, there's a null byte at the beginning of the counter
+  // section which doesn't exist in raw profile.
+  if (Obj.getTripleObjectFormat() == Triple::COFF)
+    C->CountersSectionStart++;
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MaskRay wrote:

pre-increment https://llvm.org/docs/CodingStandards.html#prefer-preincrement

https://github.com/llvm/llvm-project/pull/69493