64-bit issues with a string class

Nalin · 2010-03-28T13:19:24

I've been using AngelScript 2.18.1 in my project and so far it has been great. I've been developing it on Windows just fine. My project will be cross-platform, so I started work on the Linux version when I hit a snag. You see, my Linux computer is 64-bit, so all the libraries, compilers, etc default to 64-bit. This is when I started to run into my 64-bit issues. I had been using the scriptstdstring addon to bind std::string to AngelScript. However, do to some odd set of circumstances, AngelScript was crashing when it was trying to destruct the std::string. It was somehow related to passing it by reference. When I passed it by value, it only sort of worked. My "Update" function, which is called every frame, would silently stop working once it came across the string, yet my "OnKeyPress" function would pass the string just fine. Thinking it was a 64-bit issue, I went back to my Windows machine and had Visual Studio compile my project as a 64-bit application. I hadn't bothered to compile boost in 64-bit on Windows, so I had been developing it in 32-bit mode, and it worked great. Once I got all my libraries compiled as 64-bit, I compiled and ran my program. AngelScript passed random garbage as the string. Thinking it was just an issue with using std::string, I bound a different string class to AngelScript. This time, AngelScript passed an empty string and crashed when it tried to destruct it. This is the script that I am executing: http://nalin.pastebin.com/m7ea1ae65 In "Update", once AngelScript hit "obj.Animation = "walk.gani";", it would silently stop executing the script. However, in OnKeyPress, it would behave like normal. Is there anything I can do to further discover exactly what is going wrong?

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Started by Nalin February 14, 2010 03:31 PM

11 comments, last by WitchLord 14 years ago

WitchLord

4,834

March 21, 2010 06:47 PM

Sorry for taking so long to look into this. I made another attempt to reproduce this problem with your latest information, but unfortunately I'm still not able to. This is the code I wrote to test the scenario:

enum TEST_ENUM{	ENUM1 = 1,	ENUM2 = ENUM1*10,	ENUM3,	ENUM4 = -1};class CTestObject{public:	bool TestEnum(TEST_ENUM e) { val = e; if( e == ENUM2 ) return true; else return false; }	TEST_ENUM val;};bool Test(){	asIScriptEngine   *engine;	CBufferedOutStream bout;	int                r;	bool               fail = false; 	engine = asCreateScriptEngine(ANGELSCRIPT_VERSION);	bout.buffer = "";	r = engine->SetMessageCallback(asMETHOD(CBufferedOutStream,Callback), &bout, asCALL_THISCALL);	r = engine->RegisterGlobalFunction("void assert(bool)", asFUNCTION(Assert), asCALL_GENERIC);	// Register the enum value	r = engine->RegisterEnum("TEST_ENUM"); assert(r >= 0);	r = engine->RegisterEnumValue("TEST_ENUM", "ENUM1", ENUM1); assert(r >= 0);	r = engine->RegisterEnumValue("TEST_ENUM", "ENUM2", ENUM2); assert(r >= 0);	r = engine->RegisterEnumValue("TEST_ENUM", "ENUM3", ENUM3); assert(r >= 0);	// Test enum in param to class method	assert( sizeof(TEST_ENUM) == 4 );	r = engine->RegisterObjectType("Obj", 0, asOBJ_REF | asOBJ_NOHANDLE); assert( r >= 0 );	r = engine->RegisterObjectMethod("Obj", "bool TestEnum(TEST_ENUM)", asMETHOD(CTestObject, TestEnum), asCALL_THISCALL); assert( r >= 0 );		CTestObject obj;	obj.val = ENUM1;	r = engine->RegisterGlobalProperty("Obj obj", &obj); assert( r >= 0 );	bout.buffer = "";	r = ExecuteString(engine, "if( !obj.TestEnum(ENUM2) ) assert(false); ");	if( r != asEXECUTION_FINISHED )		fail = true;	if( bout.buffer != "" )	{		printf(bout.buffer.c_str());		fail = true;	}	if( obj.val != ENUM2 )		fail = true;	engine->Release();	return fail;}

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Nalin

100

Author

March 23, 2010 05:42 PM

Here is an example I made on 64-bit Linux:
http://suckerfreegames.com/_as/as_bug.zip

I used the projects/gnuc/makefile to compile AngelScript. I then compiled my example with:
g++ main.cpp scriptstdstring.cpp -langelscript

The program will generate a segmentation fault and crash.

I added two versions of the problem function. If you switch the comment to the first line, you can see that the enum-to-int conversion workaround doesn't cause a crash:

r = engine->RegisterGlobalFunction("bool TestEnum(TEST_ENUM)", asFUNCTION(TestEnum), asCALL_CDECL); assert(r >= 0);//r = engine->RegisterGlobalFunction("bool TestEnum(int)", asFUNCTION(TestEnum2), asCALL_CDECL); assert(r >= 0);

WitchLord

4,834

March 28, 2010 01:19 PM

That did the trick. Thanks a lot for the help in reproducing the problem.

I've now fixed this bug in revision 576.

Diff for as_datatype.cpp

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64-bit issues with a string class

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