[PATCH] D107133: [AVR] emit `MCSA_Global` references to `__do_global_ctors` and `__do_global_dtors`

[Matt Jacobson via Phabricator via llvm-commits]

mhjacobson created this revision.
mhjacobson added reviewers: benshi001, dylanmckay.
Herald added subscribers: Jim, hiraditya.
mhjacobson requested review of this revision.
Herald added a project: LLVM.
Herald added a subscriber: llvm-commits.

Emit references to `__do_global_ctors` and `__do_global_dtors` to allow constructor/destructor routines to run.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D107133

Files:
  llvm/lib/Target/AVR/AVRAsmPrinter.cpp


Index: llvm/lib/Target/AVR/AVRAsmPrinter.cpp
===================================================================
--- llvm/lib/Target/AVR/AVRAsmPrinter.cpp
+++ llvm/lib/Target/AVR/AVRAsmPrinter.cpp
@@ -25,6 +25,7 @@
 #include "llvm/CodeGen/TargetSubtargetInfo.h"
 #include "llvm/IR/Mangler.h"
 #include "llvm/MC/MCInst.h"
+#include "llvm/MC/MCContext.h"
 #include "llvm/MC/MCStreamer.h"
 #include "llvm/MC/MCSymbol.h"
 #include "llvm/Support/ErrorHandling.h"
@@ -56,8 +57,11 @@
 
   const MCExpr *lowerConstant(const Constant *CV) override;
 
+  void emitXXStructor(const DataLayout &DL, const Constant *CV) override;
+
 private:
   const MCRegisterInfo &MRI;
+  bool EmittedStructorSymbolAttrs = false;
 };
 
 void AVRAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
@@ -193,6 +197,22 @@
   return AsmPrinter::lowerConstant(CV);
 }
 
+void AVRAsmPrinter::emitXXStructor(const DataLayout &DL, const Constant *CV) {
+  if (!EmittedStructorSymbolAttrs) {
+    MCSymbol *CtorsSym = OutContext.getOrCreateSymbol("__do_global_ctors");
+    CtorsSym->setExternal(true);
+    OutStreamer->emitSymbolAttribute(CtorsSym, MCSA_Global);
+
+    MCSymbol *DtorsSym = OutContext.getOrCreateSymbol("__do_global_dtors");
+    DtorsSym->setExternal(true);
+    OutStreamer->emitSymbolAttribute(DtorsSym, MCSA_Global);
+
+    EmittedStructorSymbolAttrs = true;
+  }
+
+  AsmPrinter::emitXXStructor(DL, CV);
+}
+
 } // end of namespace llvm
 
 extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeAVRAsmPrinter() {


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