The Symbol Service Class

The class Symbol works with the symbols as stored in the various active storage areas.

Symbol Class ClassName Method

gmSL: string Symbol.ClassName(int iRoot)


<Method id="ClassName"   type="String" opcode="SCM.Symbol_ClassName" >
   <Argument id="iRoot"  type="Integer" status="ByVal" />
</Method>

The method ClassName returns the name of the class containing a specified symbol.

Symbol Class DisplayInfo Method

gmSL: void Symbol.DisplayInfo(int infValue,int dispType)


<Method id="DisplayInfo" type="void" opcode="SCM.Symbol_DisplayInfo" >
   <Argument id="infValue" type="Integer" status="ByVal" />
   <Argument id="dispType" type="Integer" status="ByVal" />
</Method>

The method DisplayInfo displays various types of information associated with a symbol. It is used primarily by methods that are auditing the content of a storage area.

Symbol Class EnumStringValue Method

gmSL: string Symbol.EnumStringValue(string enumeration, string entry)


<Method id="EnumStringValue" type="String" opcode="SCM.Symbol_EnumStringValue" >
   <Argument id="enumeration"   type="String" status="ByVal" />
   <Argument id="entry" type="String" status="ByVal" />
</Method>

The method EnumStringValue returns the string value of a named entry in a named string based enumeration.

Symbol Class FindIdentifier Method

gmSL: int Symbol.FindIdentifier(string identifier,int parent)


<Method id="FindIdentifier" type="Integer" opcode="SCM.Symbol_FindIdentifier" >
   <Argument id="identifier" type="String" status="ByVal" />
   <Argument id="parent" type="Integer" status="ByVal" optional="0" />
</Method>

The method FindIdentifier finds a qualified identifier in the symbol table beneath a specified parent or anywhere within the tree.

Symbol Class FullName Method

gmSL: string Symbol.FullName(int iRoot, int context)


<Method id="FullName" type="string" opcode="SCM.Symbol_FullName" >
   <Argument id="iRoot" type="Integer" status="ByVal" />
   <Argument id="context" type="Integer" status="ByVal" >
</Method>

The method FullName returns the fully qualified name of a symbol either as defined in the source or as written in the target.

Symbol Class FullType Method

gmSL: int Symbol.FullType(string typeName,int context,int migStatus,int idfStatus)


<Method id="FullType" type="Integer" opcode="SCM.Symbol_FullType" >
   <Argument id="typeName" type="String" status="ByVal" />
   <Argument id="context" type="Integer" status="ByRef" >
   <Argument id="migStatus" type="Integer" status="ByRef" >
   <Argument id="idfStatus" type="Integer" status="ByVal" >
</Method>

The method FullType processes a type specification string and returns its type code and any status or context flags associated with it.

Symbol Class GetDefault Method

gmSL: int Symbol.GetDefault(int clsRoot)


<Method id="GetDefault" type="Integer" opcode="SCM.Symbol_GetDefault" >
   <Argument id="clsRoot" type="Integer" status="ByVal" />
</Method>

The method GetDefault gets the root of the default component of a class. The default component is the implied referenced component referenced via singleton class reference.

Symbol Class GetTemplate Method

gmSL: string Symbol.GetTemplate(string TemplateName)


<Method id="GetTemplate" type="string" opcode="SCM.Symbol_GetTemplate" >
   <Argument id="TemplateName" type="string"  status="ByVal"/>
</Method>

The method GetTemplate gets the template string for the specified template and current language dialog.

Symbol Class NamedEntryLabel Method

gmSL: string Symbol.NamedEntryLabel(string enumName,int iValue)


<Method id="NamedEntryLabel" type="string" opcode="SCM.Symbol_NamedEntryLabel" >
   <Argument id="enumName" type="String" status="ByVal" />
   <Argument id="iValue" type="Integer" status="ByVal" >
</Method>

The method NamedEntryLabel gets the name of an entry in a specified enumeration that has a specified value.

Symbol Class ReferenceName Method

gmSL: string Symbol.ReferenceName(string refName)


<Method id="ReferenceName" type="String" opcode="SCM.Symbol_ReferenceName" >
   <Argument id="refName" type="string" status="ByVal" />
</Method>

The method ReferenceName gets the actual name of an external reference library based on its name in the source.

Symbol Class Rename Method

gmSL: void Symbol.Rename(string newName,int iRoot)


<Method id="Rename" type="void" opcode="SCM.Symbol_Rename" >
   <Argument id="newName" type="string" status="ByVal" />
   <Argument id="iRoot" type="Integer" status="ByVal" />
</Method>

The method Rename renames a symbol for use by the target. This involves either changing its name property in its storage table or changing its pattern in its structure table.

Symbol Class StorePattern Method

gmSL: int Symbol.StorePattern(string allPattern,int nPram)


<Method id="StorePattern" type="Integer" opcode="SCM.Symbol_StorePattern" >
   <Argument id="allPattern" type="string" status="ByVal" />
   <Argument id="nPram" type="Integer" status="ByVal" />
</Method>

The method StorePattern stores a surface pattern along with the number of parameters that pattern uses from the string stack in the current storage area. The parameter allPattern is the pattern string itself. Note that this method does not support multiple dialects as it is assumed that the dialect will be known at the time that the gmSL procedure performing this operation is executed. The parameter specifies the number of parameters to be associated with the pattern string.

To show how this method operates consider the following code that loads a compiled storage area and looks for a method FMStocks_DB.ConvertToString. That method contains a reference to the VB6 intrinsic CStr which is by default translated as Convert.ToString. In this case we wish to use a method MySupport.newStr instead.


<gmBasic> <!-- Unit test for Symbol.StorePattern method -->
<gmSL>
   int        subRoot;
   tVbSub     subInfo;
   tCodeBlock codptr;
   int        nCode;
   int        icode;
   int        oper;
   int        subOper;

   Execute.Output("Demo118.out","New","Text","on");
   Write.Line "Unit test for Symbol.StorePattern() Method"
   Execute.Storage("Open","Demo000");

   subRoot = Symbol.FindIdentifier("FMStocks_DB.ConvertToString");
   subInfo = Store.GetVector(subRoot);
   codptr = Opcode.GetCode();
   nCode = Store.ReadInfo(codptr,subInfo.anaCodeStart);
   Opcode.SetLength(nCode);
   Write.Line("Authored code before changing pattern");
   Runtime.AuthorCode(0,nCode);
   for(icode = 0; icode >= 0; icode = Opcode.GetNext(codptr,icode,nCode))
   {
      oper = = Opcode.GetOperation(codptr,icode,subOper);
)     if(oper == OPC.VBF && subOper == OPC.VBF.CStr) break;
   }
   Write.Line("Found VBF.Cstr at location " + icode);
)  subOper = Symbol.StorePattern("MySupport.newStr(%1d)",1);
)  Opcode.Replace(icode,OPC.APS,subOper,1);
   nCode = Opcode.GetLength();
   Write.Line("Authored code after changing pattern");
   Runtime.AuthorCode(0,nCode);
</gmSL>
</gmBasic>

First, the code locates the reference to Cstr using its operation code VBF.Cstr. Second, it uses Symbol.StorePattern to store a surface pattern that references MySupport.newStr with one parameter. Third, it replaces the old VBF.Cstr operation with an APS operation that references the new pattern. The output of the code is as follows.


Unit test for Symbol.StorePattern() Method
Authored code before changing pattern
if (VBNET.Information.IsNothing(v))
{
   Helpers.ConvertToString = "";
}
else
{
   Helpers.ConvertToString = Convert.ToString(v);
}
Found VBF.Cstr at location 70
Authored code after changing pattern
if (VBNET.Information.IsNothing(v))
{
   Helpers.ConvertToString = "";
}
else
{
   Helpers.ConvertToString = MySupport.newStr(v);
}

Symbol Class Unused Method

gmSL: int Symbol.Unused(int iRoot)


<Method id="Unused" type="Integer" opcode="SCM.Symbol_Unused" >
   <Argument id="iRoot" type="Integer" status="ByVal" />
</Method>

The method Unused determines whether a specified symbol is used within a compiled code base.

Symbol Class UseTemplate Method

gmSL: string Symbol.UseTemplate(string template,string identifier)


<Method id="UseTemplate" type="String" opcode="SCM.Symbol_UseTemplate" >
   <Argument id="template"   type="String" status="ByVal" />
   <Argument id="identifier" type="String" status="ByVal" />
</Method>

The method UseTemplate retrieves a specified template and evaluates its output string using a specified identifier.

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