DWARFFormValue.h revision 269024 
1//===-- DWARFFormValue.h ----------------------------------------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10#ifndef SymbolFileDWARF_DWARFFormValue_h_
11#define SymbolFileDWARF_DWARFFormValue_h_
12
13#include <stddef.h> // for NULL
14#include "DWARFDataExtractor.h"
15
16class DWARFCompileUnit;
17
18class DWARFFormValue
19{
20public:
21    typedef struct ValueTypeTag
22    {
23        ValueTypeTag() :
24            value(),
25            data(NULL)
26        {
27            value.uval = 0;
28        }
29
30        union
31        {
32            uint64_t uval;
33            int64_t sval;
34            const char* cstr;
35        } value;
36        const uint8_t* data;
37    } ValueType;
38
39    enum
40    {
41        eValueTypeInvalid = 0,
42        eValueTypeUnsigned,
43        eValueTypeSigned,
44        eValueTypeCStr,
45        eValueTypeBlock
46    };
47
48    DWARFFormValue(dw_form_t form = 0);
49    dw_form_t           Form()  const { return m_form; }
50    void                SetForm(dw_form_t form) { m_form = form; }
51    const ValueType&    Value() const { return m_value; }
52    void                Dump(lldb_private::Stream &s, const lldb_private::DWARFDataExtractor* debug_str_data, const DWARFCompileUnit* cu) const;
53    bool                ExtractValue(const lldb_private::DWARFDataExtractor& data,
54                                     lldb::offset_t* offset_ptr,
55                                     const DWARFCompileUnit* cu);
56    bool                IsInlinedCStr() const { return (m_value.data != NULL) && m_value.data == (const uint8_t*)m_value.value.cstr; }
57    const uint8_t*      BlockData() const;
58    uint64_t            Reference(const DWARFCompileUnit* cu) const;
59    uint64_t            Reference (dw_offset_t offset) const;
60    bool                ResolveCompileUnitReferences(const DWARFCompileUnit* cu);
61    bool                Boolean() const { return m_value.value.uval != 0; }
62    uint64_t            Unsigned() const { return m_value.value.uval; }
63    void                SetUnsigned(uint64_t uval) { m_value.value.uval = uval; }
64    int64_t             Signed() const { return m_value.value.sval; }
65    void                SetSigned(int64_t sval) { m_value.value.sval = sval; }
66    const char*         AsCString(const lldb_private::DWARFDataExtractor* debug_str_data_ptr) const;
67    bool                SkipValue(const lldb_private::DWARFDataExtractor& debug_info_data, lldb::offset_t *offset_ptr, const DWARFCompileUnit* cu) const;
68    static bool         SkipValue(const dw_form_t form, const lldb_private::DWARFDataExtractor& debug_info_data, lldb::offset_t *offset_ptr, const DWARFCompileUnit* cu);
69//  static bool         TransferValue(dw_form_t form, const lldb_private::DWARFDataExtractor& debug_info_data, lldb::offset_t *offset_ptr, const DWARFCompileUnit* cu, BinaryStreamBuf& out_buff);
70//  static bool         TransferValue(const DWARFFormValue& formValue, const DWARFCompileUnit* cu, BinaryStreamBuf& out_buff);
71//  static bool         PutUnsigned(dw_form_t form, dw_offset_t offset, uint64_t value, BinaryStreamBuf& out_buff, const DWARFCompileUnit* cu, bool fixup_cu_relative_refs);
72    static bool         IsBlockForm(const dw_form_t form);
73    static bool         IsDataForm(const dw_form_t form);
74    static const uint8_t * GetFixedFormSizesForAddressSize (uint8_t addr_size);
75    static int          Compare (const DWARFFormValue& a, const DWARFFormValue& b, const DWARFCompileUnit* a_cu, const DWARFCompileUnit* b_cu, const lldb_private::DWARFDataExtractor* debug_str_data_ptr);
76protected:
77    dw_form_t   m_form;     // Form for this value
78    ValueType   m_value;    // Contains all data for the form
79};
80
81
82#endif  // SymbolFileDWARF_DWARFFormValue_h_
83