1 files changed, 74 insertions, 0 deletions
diff --git a/contrib/llvm/lib/CodeGen/AsmPrinter/DwarfStringPool.cpp b/contrib/llvm/lib/CodeGen/AsmPrinter/DwarfStringPool.cpp
new file mode 100644
index 000000000000..2066f745e318
--- /dev/null
+++ b/contrib/llvm/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/CodeGen/AsmPrinter.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCStreamer.h"
+
+using namespace llvm;
+
+DwarfStringPool::DwarfStringPool(BumpPtrAllocator &A, AsmPrinter &Asm,
+                                 StringRef Prefix)
+    : Pool(A), Prefix(Prefix),
+      ShouldCreateSymbols(Asm.MAI->doesDwarfUseRelocationsAcrossSections()) {}
+
+DwarfStringPool::EntryRef DwarfStringPool::getEntry(AsmPrinter &Asm,
+                                                    StringRef Str) {
+  auto I = Pool.insert(std::make_pair(Str, EntryTy()));
+  if (I.second) {
+    auto &Entry = I.first->second;
+    Entry.Index = Pool.size() - 1;
+    Entry.Offset = NumBytes;
+    Entry.Symbol = ShouldCreateSymbols ? Asm.createTempSymbol(Prefix) : nullptr;
+
+    NumBytes += Str.size() + 1;
+    assert(NumBytes > Entry.Offset && "Unexpected overflow");
+  }
+  return EntryRef(*I.first);
+}
+
+void DwarfStringPool::emit(AsmPrinter &Asm, MCSection *StrSection,
+                           MCSection *OffsetSection) {
+  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<EntryTy> *, 64> Entries(Pool.size());
+
+  for (const auto &E : Pool)
+    Entries[E.getValue().Index] = &E;
+
+  for (const auto &Entry : Entries) {
+    assert(ShouldCreateSymbols == static_cast<bool>(Entry->getValue().Symbol) &&
+           "Mismatch between setting and entry");
+
+    // Emit a label for reference from debug information entries.
+    if (ShouldCreateSymbols)
+      Asm.OutStreamer->EmitLabel(Entry->getValue().Symbol);
+
+    // Emit the string itself with a terminating null byte.
+    Asm.OutStreamer->AddComment("string offset=" +
+                                Twine(Entry->getValue().Offset));
+    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 size = 4; // FIXME: DWARF64 is 8.
+    for (const auto &Entry : Entries)
+      Asm.OutStreamer->EmitIntValue(Entry->getValue().Offset, size);
+  }
+}