Move all sources from the llvm project into contrib/llvm-project.

This uses the new layout of the upstream repository, which was recently
migrated to GitHub, and converted into a "monorepo".  That is, most of
the earlier separate sub-projects with their own branches and tags were
consolidated into one top-level directory, and are now branched and
tagged together.

Updating the vendor area to match this layout is next.

1 files changed, 293 insertions, 0 deletions

diff --git a/contrib/llvm-project/llvm/lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp b/contrib/llvm-project/llvm/lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp
new file mode 100644
index 000000000000..992e44d95306
--- /dev/null
+++ b/contrib/llvm-project/llvm/lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp
@@ -0,0 +1,293 @@
+//===-- AsmPrinterDwarf.cpp - AsmPrinter Dwarf Support --------------------===//
+//
+// 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 implements the Dwarf emissions parts of AsmPrinter.
+//
+//===----------------------------------------------------------------------===//
+
+#include "ByteStreamer.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/BinaryFormat/Dwarf.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/DIE.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCDwarf.h"
+#include "llvm/MC/MCRegisterInfo.h"
+#include "llvm/MC/MCSection.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/MC/MachineLocation.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Target/TargetLoweringObjectFile.h"
+#include "llvm/Target/TargetMachine.h"
+using namespace llvm;
+
+#define DEBUG_TYPE "asm-printer"
+
+//===----------------------------------------------------------------------===//
+// Dwarf Emission Helper Routines
+//===----------------------------------------------------------------------===//
+
+/// EmitSLEB128 - emit the specified signed leb128 value.
+void AsmPrinter::EmitSLEB128(int64_t Value, const char *Desc) const {
+  if (isVerbose() && Desc)
+    OutStreamer->AddComment(Desc);
+
+  OutStreamer->EmitSLEB128IntValue(Value);
+}
+
+void AsmPrinter::EmitULEB128(uint64_t Value, const char *Desc, unsigned PadTo) const {
+  if (isVerbose() && Desc)
+    OutStreamer->AddComment(Desc);
+
+  OutStreamer->EmitULEB128IntValue(Value, PadTo);
+}
+
+/// Emit something like ".uleb128 Hi-Lo".
+void AsmPrinter::EmitLabelDifferenceAsULEB128(const MCSymbol *Hi,
+                                              const MCSymbol *Lo) const {
+  OutStreamer->emitAbsoluteSymbolDiffAsULEB128(Hi, Lo);
+}
+
+static const char *DecodeDWARFEncoding(unsigned Encoding) {
+  switch (Encoding) {
+  case dwarf::DW_EH_PE_absptr:
+    return "absptr";
+  case dwarf::DW_EH_PE_omit:
+    return "omit";
+  case dwarf::DW_EH_PE_pcrel:
+    return "pcrel";
+  case dwarf::DW_EH_PE_uleb128:
+    return "uleb128";
+  case dwarf::DW_EH_PE_sleb128:
+    return "sleb128";
+  case dwarf::DW_EH_PE_udata4:
+    return "udata4";
+  case dwarf::DW_EH_PE_udata8:
+    return "udata8";
+  case dwarf::DW_EH_PE_sdata4:
+    return "sdata4";
+  case dwarf::DW_EH_PE_sdata8:
+    return "sdata8";
+  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata4:
+    return "pcrel udata4";
+  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4:
+    return "pcrel sdata4";
+  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8:
+    return "pcrel udata8";
+  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8:
+    return "pcrel sdata8";
+  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata4
+      :
+    return "indirect pcrel udata4";
+  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
+      :
+    return "indirect pcrel sdata4";
+  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8
+      :
+    return "indirect pcrel udata8";
+  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8
+      :
+    return "indirect pcrel sdata8";
+  }
+
+  return "<unknown encoding>";
+}
+
+/// EmitEncodingByte - Emit a .byte 42 directive that corresponds to an
+/// encoding.  If verbose assembly output is enabled, we output comments
+/// describing the encoding.  Desc is an optional string saying what the
+/// encoding is specifying (e.g. "LSDA").
+void AsmPrinter::EmitEncodingByte(unsigned Val, const char *Desc) const {
+  if (isVerbose()) {
+    if (Desc)
+      OutStreamer->AddComment(Twine(Desc) + " Encoding = " +
+                              Twine(DecodeDWARFEncoding(Val)));
+    else
+      OutStreamer->AddComment(Twine("Encoding = ") + DecodeDWARFEncoding(Val));
+  }
+
+  OutStreamer->EmitIntValue(Val, 1);
+}
+
+/// GetSizeOfEncodedValue - Return the size of the encoding in bytes.
+unsigned AsmPrinter::GetSizeOfEncodedValue(unsigned Encoding) const {
+  if (Encoding == dwarf::DW_EH_PE_omit)
+    return 0;
+
+  switch (Encoding & 0x07) {
+  default:
+    llvm_unreachable("Invalid encoded value.");
+  case dwarf::DW_EH_PE_absptr:
+    return MF->getDataLayout().getPointerSize();
+  case dwarf::DW_EH_PE_udata2:
+    return 2;
+  case dwarf::DW_EH_PE_udata4:
+    return 4;
+  case dwarf::DW_EH_PE_udata8:
+    return 8;
+  }
+}
+
+void AsmPrinter::EmitTTypeReference(const GlobalValue *GV,
+                                    unsigned Encoding) const {
+  if (GV) {
+    const TargetLoweringObjectFile &TLOF = getObjFileLowering();
+
+    const MCExpr *Exp =
+        TLOF.getTTypeGlobalReference(GV, Encoding, TM, MMI, *OutStreamer);
+    OutStreamer->EmitValue(Exp, GetSizeOfEncodedValue(Encoding));
+  } else
+    OutStreamer->EmitIntValue(0, GetSizeOfEncodedValue(Encoding));
+}
+
+void AsmPrinter::emitDwarfSymbolReference(const MCSymbol *Label,
+                                          bool ForceOffset) const {
+  if (!ForceOffset) {
+    // On COFF targets, we have to emit the special .secrel32 directive.
+    if (MAI->needsDwarfSectionOffsetDirective()) {
+      OutStreamer->EmitCOFFSecRel32(Label, /*Offset=*/0);
+      return;
+    }
+
+    // If the format uses relocations with dwarf, refer to the symbol directly.
+    if (MAI->doesDwarfUseRelocationsAcrossSections()) {
+      OutStreamer->EmitSymbolValue(Label, 4);
+      return;
+    }
+  }
+
+  // Otherwise, emit it as a label difference from the start of the section.
+  EmitLabelDifference(Label, Label->getSection().getBeginSymbol(), 4);
+}
+
+void AsmPrinter::emitDwarfStringOffset(DwarfStringPoolEntry S) const {
+  if (MAI->doesDwarfUseRelocationsAcrossSections()) {
+    assert(S.Symbol && "No symbol available");
+    emitDwarfSymbolReference(S.Symbol);
+    return;
+  }
+
+  // Just emit the offset directly; no need for symbol math.
+  emitInt32(S.Offset);
+}
+
+void AsmPrinter::EmitDwarfOffset(const MCSymbol *Label, uint64_t Offset) const {
+  EmitLabelPlusOffset(Label, Offset, MAI->getCodePointerSize());
+}
+
+void AsmPrinter::EmitCallSiteOffset(const MCSymbol *Hi,
+                                    const MCSymbol *Lo,
+                                    unsigned Encoding) const {
+  // The least significant 3 bits specify the width of the encoding
+  if ((Encoding & 0x7) == dwarf::DW_EH_PE_uleb128)
+    EmitLabelDifferenceAsULEB128(Hi, Lo);
+  else
+    EmitLabelDifference(Hi, Lo, GetSizeOfEncodedValue(Encoding));
+}
+
+void AsmPrinter::EmitCallSiteValue(uint64_t Value,
+                                   unsigned Encoding) const {
+  // The least significant 3 bits specify the width of the encoding
+  if ((Encoding & 0x7) == dwarf::DW_EH_PE_uleb128)
+    EmitULEB128(Value);
+  else
+    OutStreamer->EmitIntValue(Value, GetSizeOfEncodedValue(Encoding));
+}
+
+//===----------------------------------------------------------------------===//
+// Dwarf Lowering Routines
+//===----------------------------------------------------------------------===//
+
+void AsmPrinter::emitCFIInstruction(const MCCFIInstruction &Inst) const {
+  switch (Inst.getOperation()) {
+  default:
+    llvm_unreachable("Unexpected instruction");
+  case MCCFIInstruction::OpDefCfaOffset:
+    OutStreamer->EmitCFIDefCfaOffset(Inst.getOffset());
+    break;
+  case MCCFIInstruction::OpAdjustCfaOffset:
+    OutStreamer->EmitCFIAdjustCfaOffset(Inst.getOffset());
+    break;
+  case MCCFIInstruction::OpDefCfa:
+    OutStreamer->EmitCFIDefCfa(Inst.getRegister(), Inst.getOffset());
+    break;
+  case MCCFIInstruction::OpDefCfaRegister:
+    OutStreamer->EmitCFIDefCfaRegister(Inst.getRegister());
+    break;
+  case MCCFIInstruction::OpOffset:
+    OutStreamer->EmitCFIOffset(Inst.getRegister(), Inst.getOffset());
+    break;
+  case MCCFIInstruction::OpRegister:
+    OutStreamer->EmitCFIRegister(Inst.getRegister(), Inst.getRegister2());
+    break;
+  case MCCFIInstruction::OpWindowSave:
+    OutStreamer->EmitCFIWindowSave();
+    break;
+  case MCCFIInstruction::OpNegateRAState:
+    OutStreamer->EmitCFINegateRAState();
+    break;
+  case MCCFIInstruction::OpSameValue:
+    OutStreamer->EmitCFISameValue(Inst.getRegister());
+    break;
+  case MCCFIInstruction::OpGnuArgsSize:
+    OutStreamer->EmitCFIGnuArgsSize(Inst.getOffset());
+    break;
+  case MCCFIInstruction::OpEscape:
+    OutStreamer->EmitCFIEscape(Inst.getValues());
+    break;
+  case MCCFIInstruction::OpRestore:
+    OutStreamer->EmitCFIRestore(Inst.getRegister());
+    break;
+  }
+}
+
+void AsmPrinter::emitDwarfDIE(const DIE &Die) const {
+  // Emit the code (index) for the abbreviation.
+  if (isVerbose())
+    OutStreamer->AddComment("Abbrev [" + Twine(Die.getAbbrevNumber()) + "] 0x" +
+                            Twine::utohexstr(Die.getOffset()) + ":0x" +
+                            Twine::utohexstr(Die.getSize()) + " " +
+                            dwarf::TagString(Die.getTag()));
+  EmitULEB128(Die.getAbbrevNumber());
+
+  // Emit the DIE attribute values.
+  for (const auto &V : Die.values()) {
+    dwarf::Attribute Attr = V.getAttribute();
+    assert(V.getForm() && "Too many attributes for DIE (check abbreviation)");
+
+    if (isVerbose()) {
+      OutStreamer->AddComment(dwarf::AttributeString(Attr));
+      if (Attr == dwarf::DW_AT_accessibility)
+        OutStreamer->AddComment(
+            dwarf::AccessibilityString(V.getDIEInteger().getValue()));
+    }
+
+    // Emit an attribute using the defined form.
+    V.EmitValue(this);
+  }
+
+  // Emit the DIE children if any.
+  if (Die.hasChildren()) {
+    for (auto &Child : Die.children())
+      emitDwarfDIE(Child);
+
+    OutStreamer->AddComment("End Of Children Mark");
+    emitInt8(0);
+  }
+}
+
+void AsmPrinter::emitDwarfAbbrev(const DIEAbbrev &Abbrev) const {
+  // Emit the abbreviations code (base 1 index.)
+  EmitULEB128(Abbrev.getNumber(), "Abbreviation Code");
+
+  // Emit the abbreviations data.
+  Abbrev.Emit(this);
+}