[CGFCOLLECTOR] Adding Fortran call graph collector by gomfol12 · Pull Request #115 · tudasc/MetaCG

gomfol12 · 2026-02-05T15:47:07Z

This adds a call graph collector for Fortran. The collector is implemented as a flang plugin and generates a call graph from source-level. See the tests for a list of language features this plugin covers.

This pull request is quite large, but it is not really possible splitting it in multiply requests without pushing broken code. The tests could be separate into a different pull request, but they are tightly coupled with the collector and would fail without it, so I think keeping it in one pull request makes sense.

What this adds:

new directory cgfcollector that includes flang plugin, tests, tools, etc.
flang plugin that generates call graph in metacg format.
two wrapper script cgfcollector_wrapper.sh and cgfcollector_comp_wrapper.sh that simplify running the plugin.
cgCompare tool: for comparing two call graphs (can be replaced with cgdiff)
another test runner

How to run: see cgfcollector/README.md

The commit history is a mess, and I don't know how strongly you value a clean git history and if I should clean this up.

pearzt

Thanks a lot for all the work, the structure looks really good. I have some initial comments, but I will try to do a more in-depth review soon.

cmake/FlangLLVM.cmake

cgfcollector/README.md

cgfcollector/CMakeLists.txt

cgfcollector/tools/cgCompare.cpp

jplehr

Thank you for working on this.

I did an initial brief pass, please go through the comments and address them.

One more question: Does this PR as-is already run CI pipelines? If not, please add it to the CI pipelines as appropriate.

cgfcollector/include/Edge.h

cgfcollector/include/edge.h

cgfcollector/src/Main.cpp

jplehr · 2026-02-13T10:23:31Z

cgfcollector/src/Main.cpp

+
+    std::string cgString = dumpCG();
+
+    std::unique_ptr<llvm::raw_pwrite_stream> file = ::createOutputFile(getInstance(), getCurrentFile(), "");


This can be problematic in parallel CI runs

I don't understand why this could be problematic. Every test case operates on its own set of files and is only run once, per CI run.

cgfcollector/tools/visuel.cpp

cgfcollector/CMakeLists.txt

cmake/FlangLLVM.cmake

pearzt · 2026-02-17T10:13:49Z

Please rebase this onto the most current devel.

cgfcollector/src/Main.cpp

jplehr

Another round of comments

cgfcollector/CMakeLists.txt

cgfcollector/include/Edge.h

cgfcollector/include/Function.h

cgfcollector/include/ParseTreeVisitor.h

…ction

… for debugging graph edges

… some tests.

… not inserted into cg

…first

pearzt requested changes Feb 6, 2026

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jplehr reviewed Feb 13, 2026

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gomfol12 force-pushed the fortran_collector branch from 01f3d3f to ed5d7ff Compare February 17, 2026 15:16

pearzt requested changes Feb 17, 2026

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pearzt assigned gomfol12 Feb 17, 2026

jplehr reviewed Feb 19, 2026

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gomfol12 added 23 commits February 24, 2026 12:56

add/modified cmakefiles to add cgfcollector subproject

b0e04d2

WIP: add simple function parsing and integrated graphlib

814f9f6

add wrapper and simple test script

6975bcc

add main function mangling for fortran to correctly identify main fun…

87b0684

…ction

add simple test case 1

8d643f3

added test case using a module

037ab40

fix typo in CMakeLists.txt and add precompiled headers

a080385

rework main to construct CG and set hasBody property accordingly

404c22d

tests now ignore _MetaCG part in json file

bdbcebd

update simple_01 test for MetaCG format version 3

8f1be87

add some tests

64bc589

tests ignore the origin field as this differ from machines

7119e68

nesting test for calls with %

2e822c5

function calls with % are now correctly parsed and generate dot files…

ce27a50

… for debugging graph edges

WIP: impl parsing for function overriding in derived types. And broke…

450775d

… some tests.

fix and cleanup the ProcedureDesignator parsing

93be412

add -dot option to configure .dot generation

678fc67

more tests

a4f8a57

WIP: impl finalizers parsing. Still overestimates

6515153

fix: problem with deferred keyword in abstract type where edges where…

01d37ab

… not inserted into cg

simple 05 add output.json

8d1f3e2

impl operator overloading parsing, WIP: defined operator parsing

8e3a298

better test case for operator overloading and defined operators

39d7247

gomfol12 added 20 commits February 24, 2026 12:56

add doc in tool scripts

47ec95b

updated cgfcollector README

396c7cb

removed duplicate comment

08ce761

cmake uncomment/removed lines

0aba487

README: add context and fix typo

7d05779

migration: CGCompare to CGDiff

c2b5361

removed CGCompare

da23036

simplify test script and integrate in cmake

c8d4114

cmake add flangFrontendTool find

11e693e

Filename capitalization and license headers

2b89059

removed using namespace from header files and project-local includes …

00a6051

…first

use upper case type names

5ec212a

comment style

88c39ca

Consistent naming for cgfcollector

46d895b

add cgfcollector to ci pipeline

d1ddaeb

namespacify

0571de7

more consistent whitespacing

1ff47b0

removed FLANG_LITTLE_ENDIAN as it is platform specific and not required

46bacbb

CMakeLists variable naming

17ed4c5

better option parsing and verbose option

4f762f9

gomfol12 force-pushed the fortran_collector branch from d0aea8b to 4f762f9 Compare February 24, 2026 11:57

gomfol12 added 3 commits February 24, 2026 13:17

visuel -> visual and also added some option parsing

9026920

removed visual tool

3ac9a60

Updated README.md regarding options parsing and more consistent options

146504d

gomfol12 mentioned this pull request Feb 24, 2026

[CGToDot] tool extracted from Fortran collector (#115) #119

Merged

gomfol12 added 4 commits February 24, 2026 15:07

clarified comment

1be6138

simplified main

ba2759b

add doc to replaceExtension

c93fd56

full-build container add missing mlir and flang deps

872fd22

gomfol12 changed the title ~~Adding Fortran call graph collector~~ [CGFCOLLECTOR] Adding Fortran call graph collector Mar 3, 2026


		std::string cgString = dumpCG();

		std::unique_ptr<llvm::raw_pwrite_stream> file = ::createOutputFile(getInstance(), getCurrentFile(), "");

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gomfol12 commented Feb 5, 2026

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pearzt commented Feb 17, 2026

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