зеркало из https://github.com/mozilla/gecko-dev.git
208 строки
3.4 KiB
HTML
208 строки
3.4 KiB
HTML
<HTML>
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<HEAD>
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<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
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<META NAME="Author" CONTENT="Alex Rakhlin">
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<META NAME="GENERATOR" CONTENT="Mozilla/4.05 [en]C-NSCP (WinNT; U) [Netscape]">
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<TITLE>Documentation</TITLE>
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</HEAD>
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<BODY>
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<CENTER>
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<H1>
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JSDB</H1></CENTER>
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<CENTER> </CENTER>
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<H2>
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Overview</H2>
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JSDB is a command line debugger modeled after jdb.
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<BR>
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<H2>
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Supported Commands</H2>
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<H3>
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Normal State:</H3>
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<TABLE BORDER=0 CELLSPACING=0 CELLPADDING=0 WIDTH="100%" >
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<TR>
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<TD>load <filename> </TD>
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<TD>Load and run a javascript file.</TD>
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</TR>
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<TR>
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<TD>suspend</TD>
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<TD>Stop before first instruction is executed</TD>
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</TR>
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<TR>
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<TD>stop at <filename> <line></TD>
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<TD>Set a breakpoint. File doesn't have to be loaded yet.</TD>
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</TR>
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<TR>
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<TD>clear at <filename> <line></TD>
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<TD>Clear a breakpoint.</TD>
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</TR>
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<TR>
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<TD>bp</TD>
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<TD>List breakpoints.</TD>
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</TR>
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<TR>
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<TD>list <filename> <line></TD>
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<TD>Print source code.</TD>
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</TR>
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<TR>
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<TD>scripts</TD>
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<TD>List loaded scripts.</TD>
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</TR>
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<TR>
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<TD>quit, exit</TD>
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<TD>Quit jsdb.</TD>
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</TR>
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</TABLE>
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<BR>
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<H3>
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Stopped State:</H3>
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<TABLE BORDER=0 CELLSPACING=0 CELLPADDING=0 WIDTH="100%" >
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<TR>
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<TD>resume, exit </TD>
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<TD>Resume execution.</TD>
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</TR>
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<TR>
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<TD>stop at <filename> <line> </TD>
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<TD>Set a breakpoint.</TD>
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</TR>
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<TR>
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<TD>clear at <filename> <line></TD>
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<TD>Clear a breakpoint.</TD>
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</TR>
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<TR>
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<TD>bp</TD>
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<TD>List breakpoints.</TD>
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</TR>
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<TR>
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<TD>list [<filename> <line>] </TD>
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<TD>Print source code. If filename is not specified, prints the current
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line in the current stackframe.</TD>
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</TR>
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<TR>
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<TD>up</TD>
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<TD>Move up the stack.</TD>
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</TR>
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<TR>
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<TD>down</TD>
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<TD>Move down the stack.</TD>
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</TR>
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<TR>
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<TD>where</TD>
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<TD>Dump stack.</TD>
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</TR>
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<TR>
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<TD>step</TD>
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<TD>Execute current line.</TD>
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</TR>
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<TR>
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<TD>eval <expr></TD>
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<TD>Evaluate expression in current frame. <I>print()</I> function is supported,
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so, for example, <I>eval print(a)</I> will print the value of variable
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<I>a.</I></TD>
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</TR>
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</TABLE>
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<BR>
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<BR>
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<H2>
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Example</H2>
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sample.js:
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<BR>______________________________________________________
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<BR>a=1;
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<BR>for (i=0; i<10; i++){
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<BR> a = inc (inc(a));
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<BR>}
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<P>c = a+2;
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<P>// Increment function
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<BR>function inc (b){
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<BR> return b+1;
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<BR>}
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<BR>______________________________________________________
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<P>A sample JSDB session could be:
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<P><B>>stop at sample.js:6</B>
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<BR>Script not loaded. Breakpoint will be set once the script is loaded
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<BR><B>>load sample.js</B>
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<BR>Set breakpoint at sample.js null 6
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<BR>Stopped at 6
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<BR><B>STOPPED >>list</B>
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<BR>c = a+2;
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<BR><B>STOPPED >>eval print (a)</B>
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<BR>21
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<BR><B>STOPPED >>resume</B>
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<BR><B>></B>
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<BR>
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<BR>
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<BR>
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<BR>
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<H2>
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Notes</H2>
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<UL>
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<LI>
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I didn't test JSDB much, so I'm sure that there are some bugs. If you find
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one, or if you have a suggestion, please <A HREF="mailto:rakhlin@netscape.com">e-mail</A>
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me.</LI>
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</UL>
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<H2>
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Bugs and "features"</H2>
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<UL>
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<LI>
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<B>Important</B>: JSDB crashes when executed with jits. Use <I>-nojit</I>
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switch if you are using <I>jre.exe</I>.</LI>
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</UL>
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<BR>
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<BR>
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<BR>
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<P><B>Alex Rakhlin</B>
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<BR><B><A HREF="mailto:rakhlin@netscape.com">rakhlin@netscape.com</A></B>
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</BODY>
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</HTML>
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