How does it work?

MagNumDB is a database that contains about 350,000 items. These items are constants, names, values all extracted from more than 6,000 header files (.h, .hxx, .hpp, .idl, etc.) provided by standard Windows and Visual Studio SDKs and WDKs.

Some values have been extracted from the very special uuid.lib file that contains the value of thousands of guids and property keys, not present anywhere else in header files. This can explain some duplicates (because names in uuid.lib are not always exactly the same as names in .h parsed files...).

It also contains around 36,0000 undocumented guids that we found ... meeeeep ...

 "C2P5"

To build this database, we have tried many existing parsers, things like CLANG or other fine tools, but they just don't suit our needs. They can't handle thousands of files that don't compile together, they can't handle some specific (or just very old) Microsoft constructs or annotations, they don't remember the stack of #define directives that led to a definition, they only give you a final AST, not a partial one, etc.

So, in the end, we have written a C/C++ parser named C2P5 (for C/CPP/PreProcessor/Parser), tailored specifically for computing constants. C2P5 is capable of preprocessing, parsing and partially evaluating all header files as if they were included in a one big virtual project (that of course, does not compile) on a 32G RAM machine. It currently supports the following preprocessor and C/C++ constructs:

  • #define preprocessor that define constants
  • #define preprocessor that define expression to compute constants
  • C and C++ constants, strings and enum definitions, and some level of pointerness
  • Special GUID constructs like DECLSPEC_UUID, DEFINE_GUIDSTRUCT, MIDL_INTERFACE, you name it
  • PROPERTYKEY constructs
  • Some IDL constructs
  • Etc.

The parser remembers dynamic preprocessor definitions (#if, #ifdef, etc.) that are conditions for constants definitions and expression computation. All parsed items are saved in the database, as well as the associated conditions. There may be more than one item corresponding to a given name, if there are differences in their associated conditions stack.

C2P5 supports the following types of constants, regardless of the way they are defined in source files:

  • integer, signed or unsigned, from 8-bit to 128-bit
  • floating point number, single (32-bit) or double (64-bit)
  • globally unique identifier, or guid, uuid, CLSID, IID, etc.
  • string, in narrow, wide, or utf-8/16/32 formats
  • character, in narrow, wide, or utf-8/16/32 formats
  • pointer, a constant cast as a pointer
  • property key, or PROPERTYKEY, or PKEY, a combination of a guid (fmtid) and a 32-bit integer (id).

 Powered by

C2P5 and this MagNumDB web site are written in C# and use a Lucene database as a full-text search engine. C2P5 uses a custom ANTLR4cs C grammar for expression parsing, not for preprocessor parsing.

 

 Frequently Asked Questions

  • Q: Can I run custom queries?
    A: Yes. You can use Lucene's query syntax. Note the Database is case insensitive. Check out the list of columns with their corresponding database column names:

    • Index: the item's index.
    • Name: the item's name, or title. For enum values, it's prefixed with the enum's name.
      Corresponding database field: title.
    • Type: the item's type, expressed in a specific, universal system.
      Corresponding database's field: valuetype, but use the value of the Storage type column for queries on items type.
    • Value: the item's value. For string values, it's displayed as is w/o quotes nor escaping.
      Corresponding database field: value. There is also a typedvalue field that can contain database's Int32, Int64, Float, Double or String typed values.
    • Hex Value: the item's hexadecimal value, only valid for integer types.
      There is no corresponding database field.
    • Signed Value: the item's signed value, only valid for integer and double types. Useful when you found a unsigned number and want to get the corresponding signed value (uint -> int for example).
      There is no corresponding database field.
    • Source lines(s): the source lines from which the item was extracted. Comments and characters such as TAB, CR are preserved.
      Corresponding database field: source.
    • File path: the file path from which the item was extracted, terminated by the line index.
      Corresponding database field: filepath. There are also directory and filename fields. filename is useful to query for values in a given file.
    • Score: Database's score value. Items are returned sorted by score.
    • Guid formats: a utility columns that proposes all possible guid formats. Only valid for guid types.
      There is no corresponding database field
    • Char type: the character encoding (narrow, wide, etc.). Only valid for char and string values.
      Corresponding database field: chartype.
    • Storage type: the exact storage type in the database. Only used for specific queries.
      Corresponding database field: valuetype.
    • Conditions: the list of preprocessor conditions for a given item. If a condition is surrounded with a REVERSE function, it means the reverse condition of what's surrounded was the condition.
      Corresponding database field: conditions. There may be multiple conditions fields for one item.

    Some important points to note:

    • If you search for a negative number (like error codes expressed using signed integers), you can surround the search with double quotes, for example searching for "-2147009290" is equivalent to searching for 0x80073CF6, 80073CF6 (or even 3CF6 in this specific case). If you don't surround negative numbers with double quotes, the system will search for signed and unsigned corresponding values.
    • The full-text search uses items' name, value, hex value, guid formats, source lines, etc. so refine your search if you get back too many items.
    • You can search for guid binary values using just a part of their full definition. For example, if you search for '79eac9c5', it will get you 3 guid entries
    • Leading wild card search (*whatever) is allowed, but it may slow down the search significantly.

    Here are some example or custom queries:

    title:wm_user returns the WM_USER Windows message item, not all items that reference the WM_USER token.

    title:wm_u* returns all items (Windows messages probably) whose name starts with WM_U*.

    value:1024 AND title:wm_* returns all items (Windows messages probably) whose name starts with WM_U* and value is 1024. Note AND must be UPPERCASE for database to understand it as an AND operator.

    value:"00000002-0000-0000-C000-000000000046" returns the IMalloc IID guid value.

  • Q: I always get back 400 items at most. Why?
    A: The MagNumDb site currently limits the number of returned items to this value by design. This should be enough for most real search scenarios (like enums with a big list of values).

  • Q: Some values are empty. Why?
    A: The expression evaluator cannot always compute the final value, because it sometimes require contextual information (custom defines, compiler architecture, etc.) that the parser doesn't have at parsing time. You can enable the Source line(s) column to check what's the corresponding source and try to work it out by yourself. The origin file path and line number is also included.

  • Q: Can I get all values for a given enum?
    A: Sure. For example, __VSHPROPID is the name of an enum, and a query like this: parent:__VSHPROPID will get all the enum's values (66 entries).

  • Q: I sometimes get back items whose name starts with "__magnumdb__enum_". Why?
    A: C allows unnamed enums. The MagNumDb parser just gives them a name, using the defining file name and a counter.

  • Q: I sometimes get back the same item/name twice or more with different values. For example:  TARGET_IS_NT60_OR_LATER. Why?
    A: This can be the case with defines. Their value may be different if they were surrounded by # directives (#if, #else, etc.) in the original source code. You can enable the Condition(s) column to check what are the corresponding conditions for a given item.
    Note: if a condition is surrounded with a funny REVERSE function token, it means the reverse condition of what's surrounded.

 Database Metrics

  • Last update date: Thursday May 13, 2020
  • Items count: 340878
  • Parsed files count: 8447
  • Windows SDK version: 10.0.19041.0
  • NetFx SDK version: 4.8
  • MSVC Tools version: 14.25.28610

 Rest API

There is a JSON version API (you will have to figure out the schema, it's pretty obvious) that you can call here (the search query is the 'q' parameter):

   https://www.magnumdb.com/api.aspx?q=0xC000000D&key=you-api-key-goes-here

Note this API also has a 400 items maximum limit and the server is monitored for excessive usage (the key can be removed without notice). If you want to get a key, send us an email.

 

 Contact

We welcome feedback.
Seen anything missing? A bug? A wrong value? Do you have any suggestion for improvements? Do you have an idea for a cool new feature?

Please contact us here

 About MagNumDB

MagNumDB  2017-2021 Simon Mourier V1.3.2. All rights reserved.

Profile for Simon Mourier at Stack Overflow, Q&A for professional and enthusiast programmers


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All values, names, source code fragments displayed here have been extracted from files that are property of their respective owners.

THIS SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND OTHER THAN AS SPECIFICALLY SET FORTH IN THE LICENSE AGREEMENT, INCLUDING WITHOUT LIMITATION WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Index Score Name Type Value Hex value Signed value Guid formats Char type Storage type Source line(s) File path Condition(s)
Index Score Name Type Value Hex value Signed value Guid formats Char type Storage type Source line(s) File path Condition(s)
1 10.10169 _Meta_type::_Meta_lpar Char Narrow System.TypedChar
_Meta_lpar  = '(',
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\regex(63,0)
  • If _STL_COMPILER_PREPROCESSOR
2 10.10169 _Meta_type::_Meta_rpar Char Narrow System.TypedChar
_Meta_rpar  = ')',
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\regex(64,0)
  • If _STL_COMPILER_PREPROCESSOR
3 10.10169 _Meta_type::_Meta_dlr Char Narrow System.TypedChar
_Meta_dlr   = '$',
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\regex(65,0)
  • If _STL_COMPILER_PREPROCESSOR
4 10.10169 _Meta_type::_Meta_caret Char Narrow System.TypedChar
_Meta_caret = '^',
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\regex(66,0)
  • If _STL_COMPILER_PREPROCESSOR
5 10.10169 _Meta_type::_Meta_dot Char Narrow System.TypedChar
_Meta_dot   = '.',
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\regex(67,0)
  • If _STL_COMPILER_PREPROCESSOR
6 10.10169 _Meta_type::_Meta_star Char Narrow System.TypedChar
_Meta_star  = '*',
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\regex(68,0)
  • If _STL_COMPILER_PREPROCESSOR
7 10.10169 _Meta_type::_Meta_plus Char Narrow System.TypedChar
_Meta_plus  = '+',
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\regex(69,0)
  • If _STL_COMPILER_PREPROCESSOR
8 10.10169 _Meta_type::_Meta_query Char Narrow System.TypedChar
_Meta_query = '?',
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\regex(70,0)
  • If _STL_COMPILER_PREPROCESSOR
9 10.10169 _Meta_type::_Meta_lsq Char Narrow System.TypedChar
_Meta_lsq   = '[',
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\regex(71,0)
  • If _STL_COMPILER_PREPROCESSOR
10 10.10169 _Meta_type::_Meta_rsq Char Narrow System.TypedChar
_Meta_rsq   = ']',
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\regex(72,0)
  • If _STL_COMPILER_PREPROCESSOR
11 10.10169 _Meta_type::_Meta_bar Char Narrow System.TypedChar
_Meta_bar   = '|',
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\regex(73,0)
  • If _STL_COMPILER_PREPROCESSOR
12 10.10169 _Meta_type::_Meta_esc Char Narrow System.TypedChar
_Meta_esc   = '\\',
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\regex(74,0)
  • If _STL_COMPILER_PREPROCESSOR
13 10.10169 _Meta_type::_Meta_dash Char Narrow System.TypedChar
_Meta_dash  = '-',
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\regex(75,0)
  • If _STL_COMPILER_PREPROCESSOR
14 10.10169 _Meta_type::_Meta_lbr Char Narrow System.TypedChar
_Meta_lbr   = '{',
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\regex(76,0)
  • If _STL_COMPILER_PREPROCESSOR
15 10.10169 _Meta_type::_Meta_rbr Char Narrow System.TypedChar
_Meta_rbr   = '}',
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\regex(77,0)
  • If _STL_COMPILER_PREPROCESSOR
16 10.10169 _Meta_type::_Meta_comma Char Narrow System.TypedChar
_Meta_comma = ',',
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\regex(78,0)
  • If _STL_COMPILER_PREPROCESSOR
17 10.10169 _Meta_type::_Meta_colon Char Narrow System.TypedChar
_Meta_colon = ':',
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\regex(79,0)
  • If _STL_COMPILER_PREPROCESSOR
18 10.10169 _Meta_type::_Meta_equal Char Narrow System.TypedChar
_Meta_equal = '=',
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\regex(80,0)
  • If _STL_COMPILER_PREPROCESSOR
19 10.10169 _Meta_type::_Meta_exc Char Narrow System.TypedChar
_Meta_exc   = '!',
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\regex(81,0)
  • If _STL_COMPILER_PREPROCESSOR
20 10.10169 _Meta_type::_Meta_eos Int32 -1 0xFFFFFFFF -1 System.Int32
_Meta_eos   = -1,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\regex(82,0)
  • If _STL_COMPILER_PREPROCESSOR
21 10.10169 _Meta_type::_Meta_nl Char Narrow System.TypedChar
_Meta_nl    = '\n',
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\regex(83,0)
  • If _STL_COMPILER_PREPROCESSOR
22 10.10169 _Meta_type::_Meta_cr Char Narrow System.TypedChar
_Meta_cr    = '\r',
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\regex(84,0)
  • If _STL_COMPILER_PREPROCESSOR
23 10.10169 _Meta_type::_Meta_bsp Char Narrow System.TypedChar
_Meta_bsp   = '\b',
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\regex(85,0)
  • If _STL_COMPILER_PREPROCESSOR
24 10.10169 _Meta_type::_Meta_chr Int32 0 0x00000000 0 System.Int32
_Meta_chr   = 0,
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\regex(86,0)
  • If _STL_COMPILER_PREPROCESSOR
25 10.10169 _Meta_type::_Esc_bsl Char Narrow System.TypedChar
_Esc_bsl      = '\\',
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\regex(88,0)
  • If _STL_COMPILER_PREPROCESSOR
26 10.10169 _Meta_type::_Esc_word Char Narrow System.TypedChar
_Esc_word     = 'b',
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\regex(89,0)
  • If _STL_COMPILER_PREPROCESSOR
27 10.10169 _Meta_type::_Esc_not_word Char Narrow System.TypedChar
_Esc_not_word = 'B',
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\regex(90,0)
  • If _STL_COMPILER_PREPROCESSOR
28 10.10169 _Meta_type::_Esc_ctrl_a Char Narrow System.TypedChar
_Esc_ctrl_a   = 'a',
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\regex(91,0)
  • If _STL_COMPILER_PREPROCESSOR
29 10.10169 _Meta_type::_Esc_ctrl_b Char Narrow System.TypedChar
_Esc_ctrl_b   = 'b',
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\regex(92,0)
  • If _STL_COMPILER_PREPROCESSOR
30 10.10169 _Meta_type::_Esc_ctrl_f Char Narrow System.TypedChar
_Esc_ctrl_f   = 'f',
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\regex(93,0)
  • If _STL_COMPILER_PREPROCESSOR
31 10.10169 _Meta_type::_Esc_ctrl_n Char Narrow System.TypedChar
_Esc_ctrl_n   = 'n',
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\regex(94,0)
  • If _STL_COMPILER_PREPROCESSOR
32 10.10169 _Meta_type::_Esc_ctrl_r Char Narrow System.TypedChar
_Esc_ctrl_r   = 'r',
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\regex(95,0)
  • If _STL_COMPILER_PREPROCESSOR
33 10.10169 _Meta_type::_Esc_ctrl_t Char Narrow System.TypedChar
_Esc_ctrl_t   = 't',
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\regex(96,0)
  • If _STL_COMPILER_PREPROCESSOR
34 10.10169 _Meta_type::_Esc_ctrl_v Char Narrow System.TypedChar
_Esc_ctrl_v   = 'v',
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\regex(97,0)
  • If _STL_COMPILER_PREPROCESSOR
35 10.10169 _Meta_type::_Esc_ctrl Char Narrow System.TypedChar
_Esc_ctrl     = 'c',
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\regex(98,0)
  • If _STL_COMPILER_PREPROCESSOR
36 10.10169 _Meta_type::_Esc_hex Char Narrow System.TypedChar
_Esc_hex      = 'x',
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\regex(99,0)
  • If _STL_COMPILER_PREPROCESSOR
37 10.10169 _Meta_type::_Esc_uni Char Narrow System.TypedChar
_Esc_uni      = 'u'
%ProgramFiles(x86)%\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.25.28610\include\regex(100,0)
  • If _STL_COMPILER_PREPROCESSOR