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[v5,0/4] __builtin_dynamic_object_size

Message ID 20211218123511.139456-1-siddhesh@gotplt.org
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Series __builtin_dynamic_object_size | expand

Message

Siddhesh Poyarekar Dec. 18, 2021, 12:35 p.m. UTC 
This patchset enhances the __builtin_dynamic_object_size builtin to
produce dynamic expressions for object sizes to improve coverage of
_FORTIFY_SOURCE.

Testing:
--------

This series has been tested with build and test for i686, bootstrap with
ubsan and full bootstrap and test with x86_64.  I also tested the
toolchain with a glibc build and testsuite run for x86_64 and i686 with
_FORTIFY_SOURCE=3 enabled for gcc12.

Additional testing plans (i.e. I've already started to do some of this):

- Build packages to compare values returned by __builtin_object_size
  with the older pass and this new one.  Also compare with
  __builtin_dynamic_object_size.

- Expand the list of packages to get more coverage metrics.

- Explore performance impact on applications on building with
  _FORTIFY_SOURCE=3.

Siddhesh Poyarekar (4):
  tree-object-size: Support dynamic sizes in conditions
  tree-object-size: Handle function parameters
  tree-object-size: Handle GIMPLE_CALL
  tree-object-size: Dynamic sizes for ADDR_EXPR

 gcc/builtins.c                                |   6 +-
 .../gcc.dg/builtin-dynamic-object-size-0.c    | 495 +++++++++++++
 .../gcc.dg/builtin-dynamic-object-size-10.c   |   2 +
 .../builtin-dynamic-object-size-5-main.c      |  32 +
 .../gcc.dg/builtin-dynamic-object-size-5.c    |   7 +-
 gcc/testsuite/gcc.dg/builtin-object-size-1.c  | 154 +++-
 gcc/testsuite/gcc.dg/builtin-object-size-2.c  | 133 ++++
 gcc/testsuite/gcc.dg/builtin-object-size-3.c  | 151 ++++
 gcc/testsuite/gcc.dg/builtin-object-size-4.c  |  93 +++
 gcc/testsuite/gcc.dg/builtin-object-size-5.c  |  22 +-
 gcc/tree-object-size.c                        | 670 +++++++++++++++---
 11 files changed, 1677 insertions(+), 88 deletions(-)
 create mode 100644 gcc/testsuite/gcc.dg/builtin-dynamic-object-size-0.c
 create mode 100644 gcc/testsuite/gcc.dg/builtin-dynamic-object-size-5-main.c