1 files changed, 93 insertions, 0 deletions
diff --git a/include/llvm/DebugInfo/DWARF/DWARFFormValue.h b/include/llvm/DebugInfo/DWARF/DWARFFormValue.h
new file mode 100644
index 0000000..5bb6d1b
--- /dev/null
+++ b/include/llvm/DebugInfo/DWARF/DWARFFormValue.h
@@ -0,0 +1,93 @@
+//===-- DWARFFormValue.h ----------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_DEBUGINFO_DWARFFORMVALUE_H
+#define LLVM_DEBUGINFO_DWARFFORMVALUE_H
+
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/Optional.h"
+#include "llvm/Support/DataExtractor.h"
+
+namespace llvm {
+
+class DWARFUnit;
+class raw_ostream;
+
+class DWARFFormValue {
+public:
+  enum FormClass {
+    FC_Unknown,
+    FC_Address,
+    FC_Block,
+    FC_Constant,
+    FC_String,
+    FC_Flag,
+    FC_Reference,
+    FC_Indirect,
+    FC_SectionOffset,
+    FC_Exprloc
+  };
+
+private:
+  struct ValueType {
+    ValueType() : data(nullptr) {
+      uval = 0;
+    }
+
+    union {
+      uint64_t uval;
+      int64_t sval;
+      const char* cstr;
+    };
+    const uint8_t* data;
+  };
+
+  uint16_t Form;   // Form for this value.
+  ValueType Value; // Contains all data for the form.
+
+public:
+  DWARFFormValue(uint16_t Form = 0) : Form(Form) {}
+  uint16_t getForm() const { return Form; }
+  bool isFormClass(FormClass FC) const;
+
+  void dump(raw_ostream &OS, const DWARFUnit *U) const;
+
+  /// \brief extracts a value in data at offset *offset_ptr.
+  ///
+  /// The passed DWARFUnit is allowed to be nullptr, in which
+  /// case no relocation processing will be performed and some
+  /// kind of forms that depend on Unit information are disallowed.
+  /// \returns wether the extraction succeeded.
+  bool extractValue(DataExtractor data, uint32_t *offset_ptr,
+                    const DWARFUnit *u);
+  bool isInlinedCStr() const {
+    return Value.data != nullptr && Value.data == (const uint8_t*)Value.cstr;
+  }
+
+  /// getAsFoo functions below return the extracted value as Foo if only
+  /// DWARFFormValue has form class is suitable for representing Foo.
+  Optional<uint64_t> getAsReference(const DWARFUnit *U) const;
+  Optional<uint64_t> getAsUnsignedConstant() const;
+  Optional<const char *> getAsCString(const DWARFUnit *U) const;
+  Optional<uint64_t> getAsAddress(const DWARFUnit *U) const;
+  Optional<uint64_t> getAsSectionOffset() const;
+  Optional<ArrayRef<uint8_t>> getAsBlock() const;
+
+  bool skipValue(DataExtractor debug_info_data, uint32_t *offset_ptr,
+                 const DWARFUnit *u) const;
+  static bool skipValue(uint16_t form, DataExtractor debug_info_data,
+                        uint32_t *offset_ptr, const DWARFUnit *u);
+
+  static ArrayRef<uint8_t> getFixedFormSizes(uint8_t AddrSize,
+                                             uint16_t Version);
+};
+
+}
+
+#endif