Hi, all Can a gatekeeper help review this patch This patch adds support to print VCG graphs for procedure CFGs, at various points in CG.
Specifically, the 'V' character can be used (to create VCG graphs)
wherever the 'r' character is used to print the CG IR.
Examples:
-Wb,-tVa - create a VCG graph, in CG, for all phases where we would
dump the IR
-Wb,-tVSCH create a VCG graph just for the scheduling phase.
Currently, these options only support VCG generation in CG; however,
they could be extended to support VCG generation in phases that come
before CG.
VCG graphs are named as follows:
<procedure_name>.<phase_name>.vcg
So for a procedure 'proc', -Wb,-tVSCH will create a file called:
proc.SCH.vcg. This way, the -Wb,-tVa option can create multiple VCG
files - all with unique names. "phase_names" are obtained from the
"Phases" table in tracing.c
Some notes on implementation:
The implementation uses the existing functionality to print BBs, OPs,
... The difference is that for VCG graphs, we need the BBs, OPs, to be
printed to a string rather than to a file. The lowest-level helper
functions (e.g. Print_OP_No_SrcLine) call fprintf a large number of
times. Rather, than overhauling this code, to print to either a
string or a file, a simpler approach was taken:
- print BBs to a temporary file
- Read the file into a string.
This made the implementation much simpler, *and* it was much less
intrusive to existing code. In addition, modifying the existing code
would have involved either:
- testing on multiple platforms (which were not available to the developer)
- only providing support for certain platforms (which would make the
existing code even more complex).
Printing to a file and reading back to a string obviously takes more
time than writing directly to a string; however, given that this is an
internal option only, a slight increase in compile time should be
acceptable.
-------------------------
Following is an example to use VCG
$ cat vcg.c
extern void foo(int x);
extern void bar(int x);
extern int x;
void
sub (int z)
{
if (z == 42) {
foo(x);
}
else {
bar(x);
}
}
$ opencc -O -c -Wb,-tVa vcg.c
$ ls *.vcg
sub.EBO.vcg sub.EXP.vcg sub.GCM.vcg sub.LOP.vcg sub.SCH.vcg
sub.EMT.vcg sub.FLW.vcg sub.GLR.vcg sub.LRA.vcg
--
yongchong
vcg.patch
Description: Binary data
------------------------------------------------------------------------------ Magic Quadrant for Content-Aware Data Loss Prevention Research study explores the data loss prevention market. Includes in-depth analysis on the changes within the DLP market, and the criteria used to evaluate the strengths and weaknesses of these DLP solutions. http://www.accelacomm.com/jaw/sfnl/114/51385063/
_______________________________________________ Open64-devel mailing list Open64-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/open64-devel
