[PATCH] D130877: [MCObjectFileInfo] Add getPCSection() helper

[Marco Elver via Phabricator via llvm-commits]

melver created this revision.
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Add MCObjectFileInfo::getPCSection() helper to get a section for PCs
requested via MD_pcsections.

Depends on D130876 <https://reviews.llvm.org/D130876>


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D130877

Files:
  llvm/include/llvm/MC/MCObjectFileInfo.h
  llvm/lib/MC/MCObjectFileInfo.cpp


Index: llvm/lib/MC/MCObjectFileInfo.cpp
===================================================================
--- llvm/lib/MC/MCObjectFileInfo.cpp
+++ llvm/lib/MC/MCObjectFileInfo.cpp
@@ -1179,3 +1179,25 @@
   }
   return PseudoProbeDescSection;
 }
+
+MCSection *MCObjectFileInfo::getPCSection(StringRef Name,
+                                          const MCSection *TextSec) const {
+  if (Ctx->getObjectFileType() != MCContext::IsELF)
+    return nullptr;
+
+  // SHF_WRITE for relocations, and let user post-process data in-place.
+  unsigned Flags = ELF::SHF_WRITE | ELF::SHF_ALLOC | ELF::SHF_LINK_ORDER;
+
+  if (!TextSec)
+    TextSec = getTextSection();
+
+  StringRef GroupName;
+  const auto &ElfSec = static_cast<const MCSectionELF &>(*TextSec);
+  if (const MCSymbol *Group = ElfSec.getGroup()) {
+    GroupName = Group->getName();
+    Flags |= ELF::SHF_GROUP;
+  }
+  return Ctx->getELFSection(Name, ELF::SHT_PROGBITS, Flags, 0, GroupName, true,
+                            ElfSec.getUniqueID(),
+                            cast<MCSymbolELF>(TextSec->getBeginSymbol()));
+}
Index: llvm/include/llvm/MC/MCObjectFileInfo.h
===================================================================
--- llvm/include/llvm/MC/MCObjectFileInfo.h
+++ llvm/include/llvm/MC/MCObjectFileInfo.h
@@ -363,6 +363,8 @@
 
   MCSection *getPseudoProbeDescSection(StringRef FuncName) const;
 
+  MCSection *getPCSection(StringRef Name, const MCSection *TextSec) const;
+
   // ELF specific sections.
   MCSection *getDataRelROSection() const { return DataRelROSection; }
   const MCSection *getMergeableConst4Section() const {


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