[all-commits] [llvm/llvm-project] 1c99f6: [llvm-cov gcov] Fix calculating coverage of templa...

[Igor Kudrin via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 1c99f650a7ac90c80ffd4830e05cd3408e64f42c
      https://github.com/llvm/llvm-project/commit/1c99f650a7ac90c80ffd4830e05cd3408e64f42c
  Author: Igor Kudrin <ikudrin at accesssoftek.com>
  Date:   2022-03-15 (Tue, 15 Mar 2022)

  Changed paths:
    M llvm/lib/ProfileData/GCOV.cpp
    A llvm/test/tools/llvm-cov/gcov/Inputs/tmpl.cpp
    A llvm/test/tools/llvm-cov/gcov/Inputs/tmpl.gcda
    A llvm/test/tools/llvm-cov/gcov/Inputs/tmpl.gcno
    A llvm/test/tools/llvm-cov/gcov/tmpl.test

  Log Message:
  -----------
  [llvm-cov gcov] Fix calculating coverage of template functions

Template functions share the same lines in source files, so the common
container of lines' properties cannot be used to calculate the coverage
statistics of individual functions.

> cat tmpl.cpp
template <int N> int test() { return N; }
int main() { return test<1>() + test<2>(); }
> clang++ --coverage tmpl.cpp -o tmpl
> ./tmpl
> llvm-cov gcov tmpl.cpp -f
...
Function '_Z4testILi1EEiv'
Lines executed:100.00% of 1

Function '_Z4testILi2EEiv'
Lines executed:-nan% of 0
...
> llvm-cov-patched gcov tmpl.cpp -f
...
Function '_Z4testILi1EEiv'
Lines executed:100.00% of 1

Function '_Z4testILi2EEiv'
Lines executed:100.00% of 1
...

Differential Revision: https://reviews.llvm.org/D121390