Topic: Custom AST generating page fault

Custom AST generating page fault

1 posts in topic

Flat View

Thread View

Older Post First | Reply to Topic

TOPIC ACTIONS:

Print Topic

Posted By: Marc_Fiammante
Posted On: Thursday, November 15, 2001 01:01 AM

I am trying to use Custom AST but I am getting an invalid memory access I am compiling with Visual C++ 6.0 under Windows 2000. Thank you for helping debug. To try I tested using the provided CommonAST by adding the following to exprAST.g (example in doc does not work) header ""post_include_hpp"" { #include ""antlr/CommonAST.hpp"" } ..... options { ... buildAST=true; ASTLabelType = ""antlr::RefCommonAST""; // change default of ""AST"" } In the Main I have parser.setASTNodeFactory(&CommonAST::factory); parser.expr(); // fail More>>

I am trying to use Custom AST but I am getting an invalid memory access
I am compiling with Visual C++ 6.0 under Windows 2000. Thank you for helping debug.

To try I tested using the provided CommonAST by adding the following to exprAST.g (example in doc does not work)

			

			header ""post_include_hpp"" {
			

			#include ""antlr/CommonAST.hpp""
			

			

			}
			

			.....
			

			options {
			

			

			...
			

			buildAST=true;
			

			ASTLabelType = ""antlr::RefCommonAST""; // change default of ""AST""
			

			

			}
			

			

			In the Main I have
			

			parser.setASTNodeFactory(&CommonAST::factory);
			

			

			parser.expr(); // fails here with test.in in TokenBuffer
			

			

			....
			

			

			void TokenBuffer::fill(int amount)
			

			{
			

			RefToken t;
			

			syncConsume();
			

			// Fill the buffer sufficiently to hold needed tokens
			

			while (queue.entries()
			< amount + markerOffset) {
			

			// Append the next token
			

			t=input.nextToken(); // Fails here

Any clues welcome.

<<Less

Report | Quote This | Send private message | Reply | Print

Re: Custom AST generating page fault

Posted By: Marc_Fiammante
Posted On: Thursday, November 15, 2001 01:08 AM

With test.in I am getting the page fault using Visual C++ 6.0 debugger.

I am getting page faults in all cases with other custom ASTs

With CommonAST outside of the debugger I am getting ""null AST"" with the following code :


parser.expr();
RefCommonAST ast = RefCommonAST(parser.getAST());

if (ast) {
			
cout << ast->toStringList() << endl;

} else {

cout << ""null AST"" << endl;
}

Report | Quote This | Send private message | Reply | Print