1 files changed, 123 insertions, 0 deletions
diff --git a/lib/CodeGen/AsmPrinter/DebugLocEntry.h b/lib/CodeGen/AsmPrinter/DebugLocEntry.h
new file mode 100644
index 000000000000..3beb799203b7
--- /dev/null
+++ b/lib/CodeGen/AsmPrinter/DebugLocEntry.h
@@ -0,0 +1,123 @@
+//===-- llvm/CodeGen/DebugLocEntry.h - Entry in debug_loc list -*- C++ -*--===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef CODEGEN_ASMPRINTER_DEBUGLOCENTRY_H__
+#define CODEGEN_ASMPRINTER_DEBUGLOCENTRY_H__
+#include "llvm/IR/Constants.h"
+#include "llvm/MC/MachineLocation.h"
+#include "llvm/MC/MCSymbol.h"
+
+namespace llvm {
+class DwarfCompileUnit;
+class MDNode;
+/// \brief This struct describes location entries emitted in the .debug_loc
+/// section.
+class DebugLocEntry {
+  // Begin and end symbols for the address range that this location is valid.
+  const MCSymbol *Begin;
+  const MCSymbol *End;
+
+public:
+  /// A single location or constant.
+  struct Value {
+    Value(const MDNode *Var, int64_t i)
+      : Variable(Var), EntryKind(E_Integer) {
+      Constant.Int = i;
+    }
+    Value(const MDNode *Var, const ConstantFP *CFP)
+      : Variable(Var), EntryKind(E_ConstantFP) {
+      Constant.CFP = CFP;
+    }
+    Value(const MDNode *Var, const ConstantInt *CIP)
+      : Variable(Var), EntryKind(E_ConstantInt) {
+      Constant.CIP = CIP;
+    }
+    Value(const MDNode *Var, MachineLocation Loc)
+      : Variable(Var), EntryKind(E_Location), Loc(Loc) {
+    }
+
+    // The variable to which this location entry corresponds.
+    const MDNode *Variable;
+
+    // Type of entry that this represents.
+    enum EntryType { E_Location, E_Integer, E_ConstantFP, E_ConstantInt };
+    enum EntryType EntryKind;
+
+    // Either a constant,
+    union {
+      int64_t Int;
+      const ConstantFP *CFP;
+      const ConstantInt *CIP;
+    } Constant;
+
+    // Or a location in the machine frame.
+    MachineLocation Loc;
+
+    bool operator==(const Value &other) const {
+      if (EntryKind != other.EntryKind)
+        return false;
+
+      switch (EntryKind) {
+      case E_Location:
+        return Loc == other.Loc;
+      case E_Integer:
+        return Constant.Int == other.Constant.Int;
+      case E_ConstantFP:
+        return Constant.CFP == other.Constant.CFP;
+      case E_ConstantInt:
+        return Constant.CIP == other.Constant.CIP;
+      }
+      llvm_unreachable("unhandled EntryKind");
+    }
+
+    bool isLocation() const { return EntryKind == E_Location; }
+    bool isInt() const { return EntryKind == E_Integer; }
+    bool isConstantFP() const { return EntryKind == E_ConstantFP; }
+    bool isConstantInt() const { return EntryKind == E_ConstantInt; }
+    int64_t getInt() const { return Constant.Int; }
+    const ConstantFP *getConstantFP() const { return Constant.CFP; }
+    const ConstantInt *getConstantInt() const { return Constant.CIP; }
+    MachineLocation getLoc() const { return Loc; }
+    const MDNode *getVariable() const { return Variable; }
+  };
+private:
+  /// A list of locations/constants belonging to this entry.
+  SmallVector<Value, 1> Values;
+
+  /// The compile unit that this location entry is referenced by.
+  const DwarfCompileUnit *Unit;
+
+public:
+  DebugLocEntry() : Begin(nullptr), End(nullptr), Unit(nullptr) {}
+  DebugLocEntry(const MCSymbol *B, const MCSymbol *E,
+                Value Val, const DwarfCompileUnit *U)
+      : Begin(B), End(E), Unit(U) {
+    Values.push_back(std::move(Val));
+  }
+
+  /// \brief Attempt to merge this DebugLocEntry with Next and return
+  /// true if the merge was successful. Entries can be merged if they
+  /// share the same Loc/Constant and if Next immediately follows this
+  /// Entry.
+  bool Merge(const DebugLocEntry &Next) {
+    if ((End == Next.Begin && Values == Next.Values)) {
+      End = Next.End;
+      return true;
+    }
+    return false;
+  }
+  const MCSymbol *getBeginSym() const { return Begin; }
+  const MCSymbol *getEndSym() const { return End; }
+  const DwarfCompileUnit *getCU() const { return Unit; }
+  const ArrayRef<Value> getValues() const { return Values; }
+  void addValue(Value Val) { Values.push_back(Val); }
+};
+
+}
+#endif