[clang] [compiler-rt] [llvm] [PGO] Initialize GCOV Writeout and Reset Functions in the Runtime on AIX (PR #108570)

[Qiongsi Wu via cfe-commits]

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@@ -2962,13 +2964,34 @@ void PPCAIXAsmPrinter::emitPGORefs(Module &M) {
   }
 }
 
+void PPCAIXAsmPrinter::emitGCOVRefs() {
+  if (!OutContext.hasXCOFFSection(
+          "__llvm_gcov_ctr_section",
+          XCOFF::CsectProperties(XCOFF::XMC_RW, XCOFF::XTY_SD)))
+    return;
+
+  MCSection *CtrSection = OutContext.getXCOFFSection(
+      "__llvm_gcov_ctr_section", SectionKind::getData(),
+      XCOFF::CsectProperties(XCOFF::XMC_RW, XCOFF::XTY_SD),
+      /*MultiSymbolsAllowed*/ true);
+
+  OutStreamer->switchSection(CtrSection);
+  if (OutContext.hasXCOFFSection(
+          "__llvm_covinit",
+          XCOFF::CsectProperties(XCOFF::XMC_RW, XCOFF::XTY_SD))) {
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qiongsiwu wrote:

Good catch! I think the feature does not work when `-mxcoff-roptr` is in effect. It is fixed now. The codegen test is updated to catch this case as well. 

https://github.com/llvm/llvm-project/pull/108570