1 files changed, 118 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 000000000000..3c04c969192d
--- /dev/null
+++ b/contrib/llvm/lib/CodeGen/AsmPrinter/DwarfFile.cpp
@@ -0,0 +1,118 @@
+//===- 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 "DwarfCompileUnit.h"
+#include "DwarfDebug.h"
+#include "DwarfUnit.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/DIE.h"
+#include "llvm/IR/DebugInfoMetadata.h"
+#include "llvm/MC/MCStreamer.h"
+#include <algorithm>
+#include <cstdint>
+
+using namespace llvm;
+
+DwarfFile::DwarfFile(AsmPrinter *AP, StringRef Pref, BumpPtrAllocator &DA)
+    : Asm(AP), Abbrevs(AbbrevAllocator), StrPool(DA, *Asm, Pref) {}
+
+void DwarfFile::addUnit(std::unique_ptr<DwarfCompileUnit> 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)
+    emitUnit(TheU.get(), UseOffsets);
+}
+
+void DwarfFile::emitUnit(DwarfUnit *TheU, bool UseOffsets) {
+  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->setDebugSectionOffset(SecOffset);
+    SecOffset += computeSizeAndOffsetsForUnit(TheU.get());
+  }
+}
+
+unsigned DwarfFile::computeSizeAndOffsetsForUnit(DwarfUnit *TheU) {
+  // CU-relative offset is reset to 0 here.
+  unsigned Offset = sizeof(int32_t) +      // Length of Unit Info
+                    TheU->getHeaderSize(); // Unit-specific headers
+
+  // The return value here is CU-relative, after laying out
+  // all of the CU DIE.
+  return computeSizeAndOffset(TheU->getUnitDie(), Offset);
+}
+
+// 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) {
+  return Die.computeOffsetsAndAbbrevs(Asm, Abbrevs, Offset);
+}
+
+void DwarfFile::emitAbbrevs(MCSection *Section) { Abbrevs.Emit(Asm, Section); }
+
+// 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;
+}