i'm trying rewrite method of property from:
{ return datastring; } to:
{ string temp = datastring; propertylogging.get("datastring", ref temp); return temp; } so far i've tried differnt things:
//the static method i#m trying insert var getmethod = att.attributetype.resolve().methods.firstordefault(x => x.name == _getmethodname); if (getmethod != null) { // ilprocessor.insertbefore(returninstruction, ilprocessor.create(opcodes.starg, 1)); ilprocessor.insertbefore(returninstruction, ilprocessor.createloadinstruction(property.name)); // ilprocessor.insertbefore(returninstruction, ilprocessor.create(opcodes.ldloc, 0)); ilprocessor.insertbefore(returninstruction, ilprocessor.create(opcodes.ldloca_s, 0)); ilprocessor.insertbefore(returninstruction, ilprocessor.create(opcodes.call, currentmethod.module.importreference(getmethod))); } but ends in code (decompiled ilspy):
get { string text = this.datastring; string arg_17_0 = text; string text2; propertylogging.get("datastring", ref text2); return arg_17_0; } the il code have is:
il_0000: nop il_0001: ldarg.0 il_0002: ldfld userquery.datastring il_0007: stloc.0 // text il_0008: ldloc.0 // text il_0009: stloc.1 // arg_17_0 il_000a: ldnull il_000b: stloc.2 // text2 il_000c: ldstr "datastring" il_0011: ldloca.s 02 // text2 il_0013: call userquery+propertylogging.get il_0018: nop il_0019: ldloc.1 // arg_17_0 il_001a: stloc.3 il_001b: br.s il_001d il_001d: ldloc.3 il_001e: ret but need is:
il_0000: nop il_0001: ldarg.0 il_0002: ldfld userquery.datastring il_0007: stloc.0 // temp il_0008: ldstr "datastring" il_000d: ldloca.s 00 // temp il_000f: call userquery+propertylogging.get il_0014: nop il_0015: ldloc.0 // temp il_0016: stloc.1 il_0017: br.s il_0019 il_0019: ldloc.1 il_001a: ret i've tried ti create new variable in method body, don't have clue how use it.
does know how correctly rewrite method?
thanks in advance
c# code before:
public string datastring { { return _datastring; } } il code before:
.method public hidebysig specialname instance string get_datastring () cil managed { // method begins @ rva 0x2050 // code size 12 (0xc) .maxstack 1 .locals init ( [0] string ) il_0000: nop il_0001: ldarg.0 il_0002: ldfld string classlibrary1.class1::_datastring il_0007: stloc.0 il_0008: br.s il_000a il_000a: ldloc.0 il_000b: ret } // end of method class1::get_datastring rewrite:
public void interceptpropertygetter() { // module property exist var module = moduledefinition.readmodule(@"c:\temp\classlibrary1.dll"); // property method typedefinition mytype = module.types.first(type => type.name == "class1"); var property = mytype.properties.first(prop => prop.name == "datastring").getmethod; // _datastring field fielddefinition datastringdef = mytype.fields.first(field => field.name == "_datastring"); fieldreference datastringref = module.import(datastringdef); // propertylogging static method methoddefinition propertyloggingdef = mytype.methods.first(method => method.name == "propertylogging"); methodreference propertyloggingref = module.import(propertyloggingdef); // clear method (variables , instructions ) property.body.variables.clear(); property.body.instructions.clear(); // define , init locals property.body.initlocals = true; var tempvar = new variabledefinition("temp", module.typesystem.string); property.body.variables.add(tempvar); // write il var processor = property.body.getilprocessor(); processor.emit(opcodes.ldarg_0); processor.emit(opcodes.ldfld, datastringref); processor.emit(opcodes.stloc_0); processor.emit(opcodes.ldstr, "datastring"); processor.emit(opcodes.ldloca_s, tempvar); processor.emit(opcodes.call, propertyloggingref); processor.emit(opcodes.ldloca_s, tempvar); processor.emit(opcodes.ret); processor.body.optimizemacros(); // save new module module.write(@"c:\temp\classlibrary1_new.dll"); } c# code after:
public string datastring { { string datastring = this._datastring; class1.propertylogging("datastring", ref datastring); return datastring; } } il code after:
.method public hidebysig specialname instance string get_datastring () cil managed { // method begins @ rva 0x2050 // code size 22 (0x16) .maxstack 2 .locals init ( [0] string ) il_0000: ldarg.0 il_0001: ldfld string classlibrary1.class1::_datastring il_0006: stloc.0 il_0007: ldstr "datastring" il_000c: ldloca.s 0 il_000e: call void classlibrary1.class1::propertylogging(string, string&) il_0013: ldloca.s 0 il_0015: ret } // end of method class1::get_datastring decompile made ilspy.
this not way (for example don't must clear , can add nop instructions , use unshort version of instructions) think understand how that.
