traverse the gimple tree

[sean yang]

I want to write a pass to walk the gimple tree and add some intrumentation 
code. I read the chapter 9 of "GCC Internals" document, and it seems not to 
describe the Macros to do so.

Can I get some information about this? Specifically, if someone can show me 
which .h file I should look at to find the Macros, that would be great. Or, 
Is there any other pass do the similar thing(traverse the gimple tree) that 
I can read (--I did not find)?

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//in gcc.4.0.2, tree-optimize.c
    323 void
    324 init_tree_optimization_passes (void)
    325 {
    326   struct tree_opt_pass **p;
    327
    328 #define NEXT_PASS(PASS)  (p = next_pass_1 (p, &PASS))
    329
    330   p = &all_passes;
    331   NEXT_PASS (pass_gimple);
    332
    333   NEXT_PASS (MYPASS_code_instrument); //this is what I want to do
    334   //the reason I want to add the pass here is: both C/C++(any other 
front end, later) can use this;
    335   NEXT_PASS (pass_remove_useless_stmts);
    336   NEXT_PASS (pass_mudflap_1);
    337   NEXT_PASS (pass_lower_cf);
    338   NEXT_PASS (pass_lower_eh);
    339   NEXT_PASS (pass_build_cfg);
......
}
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