1 files changed, 301 insertions, 0 deletions
diff --git a/contrib/llvm/lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp b/contrib/llvm/lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp
new file mode 100644
index 0000000..8ee613b
--- /dev/null
+++ b/contrib/llvm/lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp
@@ -0,0 +1,301 @@
+//===-- AsmPrinterDwarf.cpp - AsmPrinter Dwarf Support --------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the Dwarf emissions parts of AsmPrinter.
+//
+//===----------------------------------------------------------------------===//
+
+#include "ByteStreamer.h"
+#include "DwarfDebug.h"
+#include "DwarfExpression.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/DIE.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/MC/MCAsmInfo.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/Dwarf.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Target/TargetLoweringObjectFile.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetSubtargetInfo.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);
+}
+
+/// EmitULEB128 - emit the specified signed leb128 value.
+void AsmPrinter::EmitULEB128(uint64_t Value, const char *Desc,
+                             unsigned PadTo) const {
+  if (isVerbose() && Desc)
+    OutStreamer->AddComment(Desc);
+
+  OutStreamer->EmitULEB128IntValue(Value, PadTo);
+}
+
+/// EmitCFAByte - Emit a .byte 42 directive for a DW_CFA_xxx value.
+void AsmPrinter::EmitCFAByte(unsigned Val) const {
+  if (isVerbose()) {
+    if (Val >= dwarf::DW_CFA_offset && Val < dwarf::DW_CFA_offset + 64)
+      OutStreamer->AddComment("DW_CFA_offset + Reg (" +
+                              Twine(Val - dwarf::DW_CFA_offset) + ")");
+    else
+      OutStreamer->AddComment(dwarf::CallFrameString(Val));
+  }
+  OutStreamer->EmitIntValue(Val, 1);
+}
+
+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_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 TM.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, *Mang, 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);
+      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(DwarfStringPoolEntryRef S) const {
+  if (MAI->doesDwarfUseRelocationsAcrossSections()) {
+    emitDwarfSymbolReference(S.getSymbol());
+    return;
+  }
+
+  // Just emit the offset directly; no need for symbol math.
+  EmitInt32(S.getOffset());
+}
+
+/// EmitDwarfRegOp - Emit dwarf register operation.
+void AsmPrinter::EmitDwarfRegOp(ByteStreamer &Streamer,
+                                const MachineLocation &MLoc) const {
+  DebugLocDwarfExpression Expr(*MF->getSubtarget().getRegisterInfo(),
+                               getDwarfDebug()->getDwarfVersion(), Streamer);
+  const MCRegisterInfo *MRI = MMI->getContext().getRegisterInfo();
+  int Reg = MRI->getDwarfRegNum(MLoc.getReg(), false);
+  if (Reg < 0) {
+    // We assume that pointers are always in an addressable register.
+    if (MLoc.isIndirect())
+      // FIXME: We have no reasonable way of handling errors in here. The
+      // caller might be in the middle of a dwarf expression. We should
+      // probably assert that Reg >= 0 once debug info generation is more
+      // mature.
+      return Expr.EmitOp(dwarf::DW_OP_nop,
+                         "nop (could not find a dwarf register number)");
+
+    // Attempt to find a valid super- or sub-register.
+    if (!Expr.AddMachineRegPiece(MLoc.getReg()))
+      Expr.EmitOp(dwarf::DW_OP_nop,
+                  "nop (could not find a dwarf register number)");
+    return;
+  }
+
+  if (MLoc.isIndirect())
+    Expr.AddRegIndirect(Reg, MLoc.getOffset());
+  else
+    Expr.AddReg(Reg);
+}
+
+//===----------------------------------------------------------------------===//
+// 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::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::OpSameValue:
+    OutStreamer->EmitCFISameValue(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();
+    dwarf::Form Form = V.getForm();
+    assert(Form && "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, Form);
+  }
+
+  // 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::emitDwarfAbbrevs(const std::vector<DIEAbbrev *>& Abbrevs) const {
+  // For each abbrevation.
+  for (const DIEAbbrev *Abbrev : Abbrevs) {
+    // Emit the abbrevations code (base 1 index.)
+    EmitULEB128(Abbrev->getNumber(), "Abbreviation Code");
+
+    // Emit the abbreviations data.
+    Abbrev->Emit(this);
+  }
+
+  // Mark end of abbreviations.
+  EmitULEB128(0, "EOM(3)");
+}