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Create dummy uses for global variables

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The exit dummy block is setup to provide dummy uses of global variables to
the live variable analysis doesn't miss global variables. Much cleaner than
the previous code :) There may be some issues with aliases, though.
This commit is contained in:
Bill Currie 2012-12-10 15:20:27 +09:00
parent 2e105f17f2
commit c47cb697de
1 changed files with 9 additions and 7 deletions
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16
tools/qfcc/source/flow.c
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@ -558,13 +558,6 @@ flow_live_vars (flowgraph_t *graph)
def = set_new ();
for (st = node->sblock->statements; st; st = st->next) {
flow_analyze_statement (st, stuse, stdef, 0, 0);
if (st->type == st_func && !strncmp (st->opcode, "<RETURN", 7)) {
set_t *global_vars = set_new ();
set_assign (global_vars, graph->func->global_vars);
live_set_use (global_vars, use, def);
set_delete (global_vars);
}
live_set_use (stuse, use, def);
live_set_def (stdef, use, def);
}
@ -573,6 +566,15 @@ flow_live_vars (flowgraph_t *graph)
node->live_vars.in = set_new ();
node->live_vars.out = set_new ();
}
// create in for the exit dummy block using the global vars used by the
// function
use = set_new ();
set_assign (use, graph->func->global_vars);
node = graph->nodes[graph->num_nodes + 1];
node->live_vars.in = use;
node->live_vars.out = set_new ();
node->live_vars.use = set_new ();
node->live_vars.def = set_new ();
while (changed) {
changed = 0;