[llvm] [Xtensa] Implement base CallConvention. (PR #83280)

[Sergei Barannikov via llvm-commits]

================
@@ -0,0 +1,89 @@
+//===-- XtensaTargetStreamer.cpp - Xtensa Target Streamer Methods ---------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file provides Xtensa specific target streamer methods.
+//
+//===----------------------------------------------------------------------===//
+
+#include "XtensaTargetStreamer.h"
+#include "XtensaInstPrinter.h"
+#include "llvm/BinaryFormat/ELF.h"
+#include "llvm/MC/MCAssembler.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCObjectFileInfo.h"
+#include "llvm/MC/MCSectionELF.h"
+#include "llvm/Support/FormattedStream.h"
+
+using namespace llvm;
+
+XtensaTargetStreamer::XtensaTargetStreamer(MCStreamer &S)
+    : MCTargetStreamer(S) {}
+
+XtensaTargetAsmStreamer::XtensaTargetAsmStreamer(MCStreamer &S,
+                                                 formatted_raw_ostream &OS)
+    : XtensaTargetStreamer(S), OS(OS) {}
+
+void XtensaTargetAsmStreamer::emitLiteral(MCSymbol *LblSym, const MCExpr *Value,
+                                          SMLoc L) {
+  const MCAsmInfo *MAI = Streamer.getContext().getAsmInfo();
+
+  OS << "\t.literal\t";
+  LblSym->print(OS, MAI);
+  OS << ", ";
+  Value->print(OS, MAI);
+  OS << '\n';
+}
+
+void XtensaTargetAsmStreamer::emitLiteralPosition() {
+  OS << "\t.literal_position\n";
+}
+
+XtensaTargetELFStreamer::XtensaTargetELFStreamer(MCStreamer &S)
+    : XtensaTargetStreamer(S) {}
+
+static std::string getLiteralSectionName(StringRef CSectionName) {
+  std::size_t Pos = CSectionName.find(".text");
+  std::string SectionName;
+  if (Pos != std::string::npos) {
+    SectionName = CSectionName.substr(0, Pos);
+
+    if (Pos > 0)
+      SectionName += ".text";
+
+    CSectionName = CSectionName.drop_front(Pos);
+    CSectionName.consume_front(".text");
+
+    SectionName += ".literal";
+    SectionName += CSectionName;
+  } else {
+    SectionName = CSectionName;
+    SectionName += ".literal";
+  }
+  return SectionName;
+}
+
+void XtensaTargetELFStreamer::emitLiteral(MCSymbol *LblSym, const MCExpr *Value,
+                                          SMLoc L) {
+  MCContext &Context = getStreamer().getContext();
+  MCStreamer &OutStreamer = getStreamer();
+  MCSectionELF *CS = (MCSectionELF *)OutStreamer.getCurrentSectionOnly();
----------------
s-barannikov wrote:

```suggestion
  auto *CS = static_cast<MCSectionELF *>OutStreamer.getCurrentSectionOnly();
```

https://github.com/llvm/llvm-project/pull/83280