Update LLVM for 3.5 rebase (r209712).
Change-Id: I149556c940fb7dc92d075273c87ff584f400941f
diff --git a/lib/CodeGen/AsmPrinter/DwarfStringPool.cpp b/lib/CodeGen/AsmPrinter/DwarfStringPool.cpp
new file mode 100644
index 0000000..72cab60
--- /dev/null
+++ b/lib/CodeGen/AsmPrinter/DwarfStringPool.cpp
@@ -0,0 +1,74 @@
+//===-- llvm/CodeGen/DwarfStringPool.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 "DwarfStringPool.h"
+#include "llvm/MC/MCStreamer.h"
+
+using namespace llvm;
+
+MCSymbol *DwarfStringPool::getSectionSymbol() { return SectionSymbol; }
+
+static std::pair<MCSymbol *, unsigned> &
+getEntry(AsmPrinter &Asm,
+ StringMap<std::pair<MCSymbol *, unsigned>, BumpPtrAllocator &> &Pool,
+ StringRef Prefix, StringRef Str) {
+ std::pair<MCSymbol *, unsigned> &Entry =
+ Pool.GetOrCreateValue(Str).getValue();
+ if (!Entry.first) {
+ Entry.second = Pool.size() - 1;
+ Entry.first = Asm.GetTempSymbol(Prefix, Entry.second);
+ }
+ return Entry;
+}
+
+MCSymbol *DwarfStringPool::getSymbol(AsmPrinter &Asm, StringRef Str) {
+ return getEntry(Asm, Pool, Prefix, Str).first;
+}
+
+unsigned DwarfStringPool::getIndex(AsmPrinter &Asm, StringRef Str) {
+ return getEntry(Asm, Pool, Prefix, Str).second;
+}
+
+void DwarfStringPool::emit(AsmPrinter &Asm, const MCSection *StrSection,
+ const MCSection *OffsetSection,
+ const MCSymbol *StrSecSym) {
+ if (Pool.empty())
+ return;
+
+ // Start the dwarf str section.
+ Asm.OutStreamer.SwitchSection(StrSection);
+
+ // Get all of the string pool entries and put them in an array by their ID so
+ // we can sort them.
+ SmallVector<const StringMapEntry<std::pair<MCSymbol *, unsigned>> *, 64>
+ Entries(Pool.size());
+
+ for (const auto &E : Pool)
+ Entries[E.getValue().second] = &E;
+
+ for (const auto &Entry : Entries) {
+ // Emit a label for reference from debug information entries.
+ Asm.OutStreamer.EmitLabel(Entry->getValue().first);
+
+ // Emit the string itself with a terminating null byte.
+ Asm.OutStreamer.EmitBytes(
+ StringRef(Entry->getKeyData(), Entry->getKeyLength() + 1));
+ }
+
+ // If we've got an offset section go ahead and emit that now as well.
+ if (OffsetSection) {
+ Asm.OutStreamer.SwitchSection(OffsetSection);
+ unsigned offset = 0;
+ unsigned size = 4; // FIXME: DWARF64 is 8.
+ for (const auto &Entry : Entries) {
+ Asm.OutStreamer.EmitIntValue(offset, size);
+ offset += Entry->getKeyLength() + 1;
+ }
+ }
+}