1 files changed, 173 insertions, 0 deletions
diff --git a/contrib/llvm/lib/CodeGen/AsmPrinter/DwarfFile.cpp b/contrib/llvm/lib/CodeGen/AsmPrinter/DwarfFile.cpp
new file mode 100644
index 0000000..fdefb1d
--- /dev/null
+++ b/contrib/llvm/lib/CodeGen/AsmPrinter/DwarfFile.cpp
@@ -0,0 +1,173 @@
+//===-- llvm/CodeGen/DwarfFile.cpp - Dwarf Debug Framework ----------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "DwarfFile.h"
+#include "DwarfDebug.h"
+#include "DwarfUnit.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/Support/LEB128.h"
+#include "llvm/Target/TargetLoweringObjectFile.h"
+
+namespace llvm {
+DwarfFile::DwarfFile(AsmPrinter *AP, StringRef Pref, BumpPtrAllocator &DA)
+    : Asm(AP), StrPool(DA, *Asm, Pref) {}
+
+DwarfFile::~DwarfFile() {
+  for (DIEAbbrev *Abbrev : Abbreviations)
+    Abbrev->~DIEAbbrev();
+}
+
+// Define a unique number for the abbreviation.
+//
+DIEAbbrev &DwarfFile::assignAbbrevNumber(DIE &Die) {
+  FoldingSetNodeID ID;
+  DIEAbbrev Abbrev = Die.generateAbbrev();
+  Abbrev.Profile(ID);
+
+  void *InsertPos;
+  if (DIEAbbrev *Existing =
+          AbbreviationsSet.FindNodeOrInsertPos(ID, InsertPos)) {
+    Die.setAbbrevNumber(Existing->getNumber());
+    return *Existing;
+  }
+
+  // Move the abbreviation to the heap and assign a number.
+  DIEAbbrev *New = new (AbbrevAllocator) DIEAbbrev(std::move(Abbrev));
+  Abbreviations.push_back(New);
+  New->setNumber(Abbreviations.size());
+  Die.setAbbrevNumber(Abbreviations.size());
+
+  // Store it for lookup.
+  AbbreviationsSet.InsertNode(New, InsertPos);
+  return *New;
+}
+
+void DwarfFile::addUnit(std::unique_ptr<DwarfUnit> U) {
+  CUs.push_back(std::move(U));
+}
+
+// Emit the various dwarf units to the unit section USection with
+// the abbreviations going into ASection.
+void DwarfFile::emitUnits(bool UseOffsets) {
+  for (const auto &TheU : CUs) {
+    DIE &Die = TheU->getUnitDie();
+    MCSection *USection = TheU->getSection();
+    Asm->OutStreamer->SwitchSection(USection);
+
+    TheU->emitHeader(UseOffsets);
+
+    Asm->emitDwarfDIE(Die);
+  }
+}
+
+// Compute the size and offset for each DIE.
+void DwarfFile::computeSizeAndOffsets() {
+  // Offset from the first CU in the debug info section is 0 initially.
+  unsigned SecOffset = 0;
+
+  // Iterate over each compile unit and set the size and offsets for each
+  // DIE within each compile unit. All offsets are CU relative.
+  for (const auto &TheU : CUs) {
+    TheU->setDebugInfoOffset(SecOffset);
+
+    // CU-relative offset is reset to 0 here.
+    unsigned Offset = sizeof(int32_t) +      // Length of Unit Info
+                      TheU->getHeaderSize(); // Unit-specific headers
+
+    // EndOffset here is CU-relative, after laying out
+    // all of the CU DIE.
+    unsigned EndOffset = computeSizeAndOffset(TheU->getUnitDie(), Offset);
+    SecOffset += EndOffset;
+  }
+}
+// Compute the size and offset of a DIE. The offset is relative to start of the
+// CU. It returns the offset after laying out the DIE.
+unsigned DwarfFile::computeSizeAndOffset(DIE &Die, unsigned Offset) {
+  // Record the abbreviation.
+  const DIEAbbrev &Abbrev = assignAbbrevNumber(Die);
+
+  // Set DIE offset
+  Die.setOffset(Offset);
+
+  // Start the size with the size of abbreviation code.
+  Offset += getULEB128Size(Die.getAbbrevNumber());
+
+  // Size the DIE attribute values.
+  for (const auto &V : Die.values())
+    // Size attribute value.
+    Offset += V.SizeOf(Asm, V.getForm());
+
+  // Size the DIE children if any.
+  if (Die.hasChildren()) {
+    (void)Abbrev;
+    assert(Abbrev.hasChildren() && "Children flag not set");
+
+    for (auto &Child : Die.children())
+      Offset = computeSizeAndOffset(*Child, Offset);
+
+    // End of children marker.
+    Offset += sizeof(int8_t);
+  }
+
+  Die.setSize(Offset - Die.getOffset());
+  return Offset;
+}
+
+void DwarfFile::emitAbbrevs(MCSection *Section) {
+  // Check to see if it is worth the effort.
+  if (!Abbreviations.empty()) {
+    // Start the debug abbrev section.
+    Asm->OutStreamer->SwitchSection(Section);
+    Asm->emitDwarfAbbrevs(Abbreviations);
+  }
+}
+
+// Emit strings into a string section.
+void DwarfFile::emitStrings(MCSection *StrSection, MCSection *OffsetSection) {
+  StrPool.emit(*Asm, StrSection, OffsetSection);
+}
+
+bool DwarfFile::addScopeVariable(LexicalScope *LS, DbgVariable *Var) {
+  SmallVectorImpl<DbgVariable *> &Vars = ScopeVariables[LS];
+  const DILocalVariable *DV = Var->getVariable();
+  // Variables with positive arg numbers are parameters.
+  if (unsigned ArgNum = DV->getArg()) {
+    // Keep all parameters in order at the start of the variable list to ensure
+    // function types are correct (no out-of-order parameters)
+    //
+    // This could be improved by only doing it for optimized builds (unoptimized
+    // builds have the right order to begin with), searching from the back (this
+    // would catch the unoptimized case quickly), or doing a binary search
+    // rather than linear search.
+    auto I = Vars.begin();
+    while (I != Vars.end()) {
+      unsigned CurNum = (*I)->getVariable()->getArg();
+      // A local (non-parameter) variable has been found, insert immediately
+      // before it.
+      if (CurNum == 0)
+        break;
+      // A later indexed parameter has been found, insert immediately before it.
+      if (CurNum > ArgNum)
+        break;
+      if (CurNum == ArgNum) {
+        (*I)->addMMIEntry(*Var);
+        return false;
+      }
+      ++I;
+    }
+    Vars.insert(I, Var);
+    return true;
+  }
+
+  Vars.push_back(Var);
+  return true;
+}
+} // namespace llvm