Re: SymGetTypeInfo and TI_GET_SYMNAME

From: Nicolas Hognon (nicolash_at_virtools.com)
Date: 03/26/04

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    Date: Fri, 26 Mar 2004 18:05:12 +0100
To: Oleg Starodumov <oleg_staro@hotmail.com>

    Hello,

    it is me again ....
    Here is my new test

    struct MyStruct
    {
            int a;
            int b;
    };

    typedef int MyType;
    typedef MyStruct MyStruct2;

    bool Test(int pInt, char pChar, char* pStr)
    {
            MyStruct mystruct;
            mystruct.a = 1;
            mystruct.b = 2;
            MyType mytype = 3;

            static const int staticconstint = 4;
            static int staticint = 5;
            const int constint = 6;
            const int* addr = &constint;

            MyStruct2 mystruct2;
            mystruct2.a = 7;
            mystruct2.b = 8;

            int array1[] = {11,12,13,14,15,16,17,18,19,20};
            short array2[] = {1,2,3,4,5,6,7,8,9,10};
            GetFunctionDebugInfo();
            return true;
    }

    Now i succed to have information about struct and typedef.
    My last problem is pointer and array management.
    How can i make the difference between:
      - const int constint = 6;
      - const int* addr = &constint;
      - int array1[] = {11,12,13,14,15,16,17,18,19,20};
      - short array2[] = {1,2,3,4,5,6,7,8,9,10};

    all this variables type are basic. and this type is int
    (btInt is 6 from DIA SDK header file cvconst.h).
    To make the difference between all type of int I can use the field
    Size from the SYMBOL_INFO structure. But size is 4 for addr, array1 and
    array2. I certainly mised something.

    Some one got an idea ?

    thanks ....

    Oleg Starodumov wrote:

    > Hi,
    >
    >
    >>I alredy read the Under The Hood article called "Improved Error
    >>Reporting with DBGHELP 5.1 APIs" but I cannot succed to get the name of
    >>my parameters type when they are user defined (my own string class, ....).
    >>
    >
    >
    > Since I remember it was I who suggested you to use this article,
    > I must apologize and say that the article is far from enough to complete
    > the task. It shows how to work with the simplest types, but nothing more.
    >
    > To be able to work with all possible types, it is necessary to become familiar
    > with symbol types (identified by "tags") and relationships between symbols.
    >
    > Since DbgHelp and DIA work with the same data and use the same concepts,
    > DIA documentation can help here:
    > http://msdn.microsoft.com/library/en-us/diasdk/html/vsoriDebugInterfaceAccessSDK.asp?frame=true
    >
    >
    >>2. here is my callback function to test SymGetTypeInfo with TI_GET_SYMNAME
    >>
    >>static BOOL CALLBACK MyEnumSymbolsCallback(PSYMBOL_INFO symbol,
    >> ULONG symbolSize,
    >> PVOID userContext)
    >>{
    >> WCHAR* pwszTypeName = 0;
    >> if (SymGetTypeInfo(ProcessHandle,
    >> symbol->ModBase,
    >> symbol->TypeIndex,
    >> TI_GET_SYMNAME,
    >> &pwszTypeName)) {
    >> // ok I've got the name
    >> LocalFree(pwszTypeName);
    >> } else {
    >> // FAILED :(((
    >> }
    >>}
    >>
    >>And it always failed :(((
    >>
    >
    >
    > Failed because "name" property (identified by TI_GET_SYMNAME) is not supported
    > for the symbol identified by TypeIndex. It is possible to get the type name only if symbol's
    > type is a class, structure, union, enum, typedef. For all other types, name is not available directly
    > or at all (basic type - not available, use TI_GET_BASETYPE to get BasicType enumeration
    > instead; pointer type - it is necessary to remember that it is a pointer and skip to the type
    > the pointer points to; array - no name at all; function type - no name at all).
    >
    > So the basic procedure is the following:
    > 1) Use TI_GET_SYMTAG with SYMBOL_INFO.TypeIndex to obtain the tag of the type symbol.
    > 2) Depending on the tag, use the type symbol's properties to reconstruct the type declaration
    > (not necessarily a name, think of array type as an example).
    > 3) For some type symbols, it is necessary to analyze some additional symbols (may be children,
    > obtained using TI_FINDCHILDREN, may be by an index obtained through a property).
    >
    >
    >>and I succed to get the following information
    >>
    >>TestCurrentFunctionInfo(p0=0x12fa58,
    >> char p1="titi",
    >> char p2="TITI",
    >> char p3=c,
    >> int p4=3,
    >> int p5=1243756)
    >>
    >>but i want
    >>void TestCurrentFunctionInfo(vkString p0="adresse of str",
    >> const char* p1="titi",
    >> char* p2="TITI",
    >> char p3=c,
    >> int p4=3,
    >> int* p5="adresse of array")
    >>
    >
    >
    > The code from the article works only with the simplest types.
    > With everything else (such as pointer types) it works incorrectly.
    >
    > Regards,
    > Oleg
    >
    >
    >
    >
    >
    >
    >

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