[clang] [llvm] [X86][COFF] Enable basic-block-address-map emission (PR #191347)

[Haohai Wen via cfe-commits]

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@@ -1266,23 +1266,42 @@ MCObjectFileInfo::getStackSizesSection(const MCSection &TextSec) const {
 
 MCSection *
 MCObjectFileInfo::getBBAddrMapSection(const MCSection &TextSec) const {
-  if (Ctx->getObjectFileType() != MCContext::IsELF)
-    return nullptr;
+  constexpr StringLiteral Name = ".llvm_bb_addr_map";
+  if (Ctx->getObjectFileType() == MCContext::IsELF) {
+    const MCSectionELF &ElfSec = static_cast<const MCSectionELF &>(TextSec);
+    unsigned Flags = ELF::SHF_LINK_ORDER;
+    StringRef GroupName;
+    if (const MCSymbol *Group = ElfSec.getGroup()) {
+      GroupName = Group->getName();
+      Flags |= ELF::SHF_GROUP;
+    }
 
-  const MCSectionELF &ElfSec = static_cast<const MCSectionELF &>(TextSec);
-  unsigned Flags = ELF::SHF_LINK_ORDER;
-  StringRef GroupName;
-  if (const MCSymbol *Group = ElfSec.getGroup()) {
-    GroupName = Group->getName();
-    Flags |= ELF::SHF_GROUP;
+    // Use the text section's begin symbol and unique ID to create a separate
+    // .llvm_bb_addr_map section associated with every unique text section.
+    return Ctx->getELFSection(
+        Name, ELF::SHT_LLVM_BB_ADDR_MAP, Flags, 0, GroupName, true,
+        ElfSec.getUniqueID(),
+        static_cast<const MCSymbolELF *>(TextSec.getBeginSymbol()));
+  } else if (Ctx->getObjectFileType() == MCContext::IsCOFF) {
+    StringRef COMDATSymName = "";
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HaohaiWen wrote:

Done

https://github.com/llvm/llvm-project/pull/191347