Learning ASM

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Hello,

I am just now learning ASM and this is my first post.

I've cobbled together a working Java agent that uses ASM to modify methods
in the code I want to trace/debug/monitor. Specifically, I modify static
methods, instance methods, and constructors. These modifications, inserted
at methods' entry, call into my tracing program.

There's an awful lot I don't know about ASM and I would be grateful for
help with a few things (for now):

   - How can ASM be used to "single step" through program execution? By
   "single step" I mean similar to the Eclipse debug breakpoint facility where
   pressing F5 allows you to step into the next instruction.
   - How can I "hook" INVOKEVIRTUAL calls? I would like to know when a
   method calls another method.
   - What are "labels" and how are they used?

Thanks very much.

-Paul

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<div dir=3D"ltr"><div dir=3D"ltr">Hello,<br></div><div><br></div><div>I am =
just now learning ASM and this is my first post.</div><div><br></div><div>I=
&#39;ve cobbled together a working Java agent that uses ASM to modify metho=
ds in the code I want to trace/debug/monitor. Specifically, I modify static=
 methods, instance methods, and constructors. These modifications, inserted=
 at methods&#39; entry, call into my tracing program.</div><div><br></div><=
div>There&#39;s an awful lot I don&#39;t know about ASM and I would be grat=
eful for help with a few things (for now):</div><div><ul><li>How can ASM be=
 used to &quot;single step&quot; through program execution? By &quot;single=
 step&quot; I mean similar to the Eclipse debug breakpoint facility where p=
ressing F5 allows you to step into the next instruction.<br></li><li>How ca=
n I &quot;hook&quot; INVOKEVIRTUAL calls? I would like to know when a metho=
d calls another method.<br></li><li>What are &quot;labels&quot; and how are=
 they used?<br></li></ul></div><div>Thanks very much.</div><div><br></div><=
div>-Paul</div><div><br></div></div>

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