Update LLVM for 3.5 rebase (r209712).
Change-Id: I149556c940fb7dc92d075273c87ff584f400941f
diff --git a/lib/CodeGen/AsmPrinter/DwarfFile.cpp b/lib/CodeGen/AsmPrinter/DwarfFile.cpp
new file mode 100644
index 0000000..737ee54
--- /dev/null
+++ b/lib/CodeGen/AsmPrinter/DwarfFile.cpp
@@ -0,0 +1,156 @@
+//===-- 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/MC/MCStreamer.h"
+#include "llvm/Support/LEB128.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/Target/TargetLoweringObjectFile.h"
+
+namespace llvm {
+DwarfFile::DwarfFile(AsmPrinter *AP, StringRef Pref, BumpPtrAllocator &DA)
+ : Asm(AP), StrPool(DA, *Asm, Pref) {}
+
+DwarfFile::~DwarfFile() {}
+
+// Define a unique number for the abbreviation.
+//
+void DwarfFile::assignAbbrevNumber(DIEAbbrev &Abbrev) {
+ // Check the set for priors.
+ DIEAbbrev *InSet = AbbreviationsSet.GetOrInsertNode(&Abbrev);
+
+ // If it's newly added.
+ if (InSet == &Abbrev) {
+ // Add to abbreviation list.
+ Abbreviations.push_back(&Abbrev);
+
+ // Assign the vector position + 1 as its number.
+ Abbrev.setNumber(Abbreviations.size());
+ } else {
+ // Assign existing abbreviation number.
+ Abbrev.setNumber(InSet->getNumber());
+ }
+}
+
+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(DwarfDebug *DD, const MCSymbol *ASectionSym) {
+ for (const auto &TheU : CUs) {
+ DIE &Die = TheU->getUnitDie();
+ const MCSection *USection = TheU->getSection();
+ Asm->OutStreamer.SwitchSection(USection);
+
+ // Emit the compile units header.
+ Asm->OutStreamer.EmitLabel(TheU->getLabelBegin());
+
+ // Emit size of content not including length itself
+ Asm->OutStreamer.AddComment("Length of Unit");
+ Asm->EmitInt32(TheU->getHeaderSize() + Die.getSize());
+
+ TheU->emitHeader(ASectionSym);
+
+ DD->emitDIE(Die);
+ Asm->OutStreamer.EmitLabel(TheU->getLabelEnd());
+ }
+}
+// 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.
+ assignAbbrevNumber(Die.getAbbrev());
+
+ // Get the abbreviation for this DIE.
+ const DIEAbbrev &Abbrev = Die.getAbbrev();
+
+ // Set DIE offset
+ Die.setOffset(Offset);
+
+ // Start the size with the size of abbreviation code.
+ Offset += getULEB128Size(Die.getAbbrevNumber());
+
+ const SmallVectorImpl<DIEValue *> &Values = Die.getValues();
+ const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev.getData();
+
+ // Size the DIE attribute values.
+ for (unsigned i = 0, N = Values.size(); i < N; ++i)
+ // Size attribute value.
+ Offset += Values[i]->SizeOf(Asm, AbbrevData[i].getForm());
+
+ // Get the children.
+ const auto &Children = Die.getChildren();
+
+ // Size the DIE children if any.
+ if (!Children.empty()) {
+ assert(Abbrev.hasChildren() && "Children flag not set");
+
+ for (auto &Child : Children)
+ Offset = computeSizeAndOffset(*Child, Offset);
+
+ // End of children marker.
+ Offset += sizeof(int8_t);
+ }
+
+ Die.setSize(Offset - Die.getOffset());
+ return Offset;
+}
+void DwarfFile::emitAbbrevs(const MCSection *Section) {
+ // Check to see if it is worth the effort.
+ if (!Abbreviations.empty()) {
+ // Start the debug abbrev section.
+ Asm->OutStreamer.SwitchSection(Section);
+
+ // For each abbrevation.
+ for (const DIEAbbrev *Abbrev : Abbreviations) {
+ // Emit the abbrevations code (base 1 index.)
+ Asm->EmitULEB128(Abbrev->getNumber(), "Abbreviation Code");
+
+ // Emit the abbreviations data.
+ Abbrev->Emit(Asm);
+ }
+
+ // Mark end of abbreviations.
+ Asm->EmitULEB128(0, "EOM(3)");
+ }
+}
+
+// Emit strings into a string section.
+void DwarfFile::emitStrings(const MCSection *StrSection,
+ const MCSection *OffsetSection,
+ const MCSymbol *StrSecSym) {
+ StrPool.emit(*Asm, StrSection, OffsetSection, StrSecSym);
+}
+}