llvm16 targets

1 files changed, 93 insertions, 0 deletions

diff --git a/contrib/libs/llvm16/lib/CodeGen/AsmPrinter/AIXException.cpp b/contrib/libs/llvm16/lib/CodeGen/AsmPrinter/AIXException.cpp
new file mode 100644
index 00000000000..82b5ccdc70e
--- /dev/null
+++ b/contrib/libs/llvm16/lib/CodeGen/AsmPrinter/AIXException.cpp
@@ -0,0 +1,93 @@
+//===-- CodeGen/AsmPrinter/AIXException.cpp - AIX Exception Impl ----------===//
+//
+// 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 contains support for writing AIX exception info into asm files.
+//
+//===----------------------------------------------------------------------===//
+
+#include "DwarfException.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
+#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
+#include "llvm/MC/MCSectionXCOFF.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/Target/TargetLoweringObjectFile.h"
+#include "llvm/Target/TargetMachine.h"
+
+namespace llvm {
+
+AIXException::AIXException(AsmPrinter *A) : EHStreamer(A) {}
+
+void AIXException::emitExceptionInfoTable(const MCSymbol *LSDA,
+                                          const MCSymbol *PerSym) {
+  // Generate EH Info Table.
+  // The EH Info Table, aka, 'compat unwind section' on AIX, have the following
+  // format: struct eh_info_t {
+  //   unsigned version;           /* EH info verion 0 */
+  // #if defined(__64BIT__)
+  //   char _pad[4];               /* padding */
+  // #endif
+  //   unsigned long lsda;         /* Pointer to LSDA */
+  //   unsigned long personality;  /* Pointer to the personality routine */
+  //   }
+
+  auto *EHInfo =
+      cast<MCSectionXCOFF>(Asm->getObjFileLowering().getCompactUnwindSection());
+  if (Asm->TM.getFunctionSections()) {
+    // If option -ffunction-sections is on, append the function name to the
+    // name of EH Info Table csect so that each function has its own EH Info
+    // Table csect. This helps the linker to garbage-collect EH info of unused
+    // functions.
+    SmallString<128> NameStr = EHInfo->getName();
+    raw_svector_ostream(NameStr) << '.' << Asm->MF->getFunction().getName();
+    EHInfo = Asm->OutContext.getXCOFFSection(NameStr, EHInfo->getKind(),
+                                             EHInfo->getCsectProp());
+  }
+  Asm->OutStreamer->switchSection(EHInfo);
+  MCSymbol *EHInfoLabel =
+      TargetLoweringObjectFileXCOFF::getEHInfoTableSymbol(Asm->MF);
+  Asm->OutStreamer->emitLabel(EHInfoLabel);
+
+  // Version number.
+  Asm->emitInt32(0);
+
+  const DataLayout &DL = MMI->getModule()->getDataLayout();
+  const unsigned PointerSize = DL.getPointerSize();
+
+  // Add necessary paddings in 64 bit mode.
+  Asm->OutStreamer->emitValueToAlignment(Align(PointerSize));
+
+  // LSDA location.
+  Asm->OutStreamer->emitValue(MCSymbolRefExpr::create(LSDA, Asm->OutContext),
+                              PointerSize);
+
+  // Personality routine.
+  Asm->OutStreamer->emitValue(MCSymbolRefExpr::create(PerSym, Asm->OutContext),
+                              PointerSize);
+}
+
+void AIXException::endFunction(const MachineFunction *MF) {
+  // There is no easy way to access register information in `AIXException`
+  // class. when ShouldEmitEHBlock is false and VRs are saved, A dumy eh info
+  // table are emitted in PPCAIXAsmPrinter::emitFunctionBodyEnd.
+  if (!TargetLoweringObjectFileXCOFF::ShouldEmitEHBlock(MF))
+    return;
+
+  const MCSymbol *LSDALabel = emitExceptionTable();
+
+  const Function &F = MF->getFunction();
+  assert(F.hasPersonalityFn() &&
+         "Landingpads are presented, but no personality routine is found.");
+  const auto *Per =
+      cast<GlobalValue>(F.getPersonalityFn()->stripPointerCasts());
+  const MCSymbol *PerSym = Asm->TM.getSymbol(Per);
+
+  emitExceptionInfoTable(LSDALabel, PerSym);
+}
+
+} // End of namespace llvm