Bill Currie
2b2ea5c9b3
Compute dags as part of data flow analysis.
...
I want to use the live variable information when building the dags.
2012-11-15 13:44:08 +09:00
Bill Currie
9f409b1ac4
Rename make_dag to dag_create.
2012-11-15 13:44:08 +09:00
Bill Currie
16410332af
Create the dags list in execution order.
...
The root nodes of the dag need to be evaluated in execution order as some
roots may depend on the results of earlier roots (but then, this might also
be related to the problem of function calls not specifying all of their
parameters to the dag).
2012-11-15 13:44:08 +09:00
Bill Currie
04a8e19481
Move the flow-var use/define calcs to a better place.
...
dags.c really isn't the right place. The only reason it wasn't in flow.c in
the first place is find_operands was in the wrong place.
2012-11-15 13:44:08 +09:00
Bill Currie
c00e666668
Expose find_operands.
...
It has proven to be a generally useful function, not just for dags.
2012-11-15 13:44:08 +09:00
Bill Currie
0b49bd343c
Collect information on statements that set or use vars.
...
First, it turns out using daglabels wasn't such a workable plan (due to
labels being flushed every sblock). Instead, flowvars are used. Each actual
variable (whether normal or temp) has a pointer to the flowvar attached to
that variable.
For each variable, the statements that use or define the variable are
recorded in the appropriate set attached to each (flow)variable.
2012-11-15 13:44:08 +09:00
Bill Currie
739ebc522c
Begin working on flow analysis.
...
For now, variable and flow graph node maps are built.
2012-11-15 13:44:06 +09:00
Bill Currie
5acf474882
Double quote dag labels.
...
Dot interprets escape sequences in non-html string, and needs the quotes to
be escaped, so quote the result of operand_string. Unfortunately,
operand_string uses quote_string and quote_string returns a static pointer,
so some hoop-jumping is necessary.
2012-11-15 13:44:06 +09:00
Bill Currie
60d03dbdd9
Fix the naive opcode checks.
...
Confusing . with .=, and < and <= with more <MOVE etc isn't good.
2012-11-15 13:44:06 +09:00
Bill Currie
dc9d2a982e
Make the returned dag a linked list of root-nodes.
...
A dag can have mulitple "root" nodes (ie, nodes with no parents).
2012-11-15 13:44:06 +09:00
Bill Currie
a22260030a
Use value for pointer operands.
...
This allows daglabels on pointer operands without a redundant daglabel
pointer.
2012-11-15 13:44:06 +09:00
Bill Currie
0c58cd9067
Generate only one daglabel for value operands.
...
As each value is now unique, their labels can also be unique, which will
improve CSE.
2012-11-15 13:44:06 +09:00
Bill Currie
01c8aaae8c
Add some error checking for attaching identifiers.
2012-11-15 13:44:06 +09:00
Bill Currie
0ccf4093e4
Handle attached identifier labels correctly.
...
I'd forgotten I had the prev field. Makes for much cleaner code.
2012-11-15 13:44:06 +09:00
Bill Currie
39506881c0
Fix the completely bogus handling of "x" in dag creation.
...
That made a complete mashup of attached identifiers :P
2012-11-15 13:44:06 +09:00
Bill Currie
7b2e426545
Support temp operands in dags.
2012-11-15 13:44:05 +09:00
Bill Currie
9bc65ffedb
Start actually trying to build dags.
...
Temporary variables aren't being handled correctly (treated as constants),
but it looks like a good start.
2012-11-15 13:44:05 +09:00
Bill Currie
aa2943709e
Start work on building dags from basic blocks.
...
Doesn't compile and the design is in flux anyway, but I want to get back to
iqm.
2012-11-15 13:44:05 +09:00
Bill Currie
0fefeb73fe
Initial support for basic block dags.
...
Currently, only dumping to dot, but that seems to be a very sensible place
to start: debug support.
2012-11-15 13:44:05 +09:00
