Don't dynamically recurse when analyzing functions

bug: 38257724

With this CL, dEQP-GLES3.functional.shaders.functions.invalid no longer results
in a stack overflow and system crash.

The fix is to explicitly loop over switch cases in the function call
depth analysis.

Later on, we probably want to change TIntermSwitch traversal to loop
over all cases of the switch statement as well, but that requires
a lot of changes; all traversers need to be changed to not have to loop over
switch statements themselves, which will break expectations and
perhaps functionality that critically depends on seeing/controlling iteration
over switch statement cases.

Not tested for regressions in dEQP-GLES2.functional.shaders.*

Test: dEQP-GLES3.functional.shaders.functions.invalid.dynamic_switch_recursion_vertex:
system crash, hang, or fail -> Pass

Change-Id: I5d13a5f3296579c8818975e103f5ed6e03a47b68
Reviewed-by: Lingfeng Yang <>
Reviewed-by: Nicolas Capens <>
Tested-by: Lingfeng Yang <>
(cherry picked from commit 1fb04acc3fb3cbcbe4791b5a37930e332e8af4e3)
Tested-by: Nicolas Capens <>
2 files changed
tree: d85fa8979d9e39609f28207a351a2c019109c5da
  1. .dir-locals.el
  2. .gitignore
  3. .gitmodules
  4. .vscode/
  5. AUTHORS.txt
  8. CMakeLists.txt
  11. DEPS
  12. LICENSE.txt
  13. OWNERS
  16. README.version
  17. SwiftShader.sln
  18. docs/
  19. include/
  20. src/
  21. tests/
  22. third_party/



SwiftShader is a high-performance CPU-based implementation of the OpenGL ES and Direct3D 9 graphics APIs12. Its goal is to provide hardware independence for advanced 3D graphics.


The SwiftShader libraries act as drop-in replacements for graphics drivers.

On Windows, most applications can be made to use SwiftShader's DLLs by placing them in the same folder as the executable. On Linux, the LD_LIBRARY_PATH environment variable or -rpath linker option can be used to direct applications to search for shared libraries in the indicated directory first.

Prebuilt binaries can be found at:


See CONTRIBUTING.txt for important contributing requirements.

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git clone && (cd SwiftShader && curl -Lo `git rev-parse --git-dir`/hooks/commit-msg ; chmod +x `git rev-parse --git-dir`/hooks/commit-msg)

Changes are uploaded to Gerrit by performing:

git push origin HEAD:refs/for/master


See docs/


Public mailing list:

Bug tracker:


The SwiftShader project is licensed under the Apache License Version 2.0. You can find a copy of it in LICENSE.txt.

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