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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang coverage shows incorrect number of macro expansions"
href="https://bugs.llvm.org/show_bug.cgi?id=47301">47301</a>
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<th>Summary</th>
<td>clang coverage shows incorrect number of macro expansions
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>zequanwu@google.com
</td>
</tr>
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<pre>In the following code example, it shows the macro executed 4 times, but it
should be 1. It also generates 4 identical regions, File 1, 4:15 -> 4:24 = #0 ,
which I believe is the cause for that.
$ clang++ -fcoverage-mapping -fprofile-instr-generate b.cpp -Xclang
-dump-coverage-mapping && ./a.out && llvm-profdata merge -sparse
default.profraw -o a.profdata && llvm-cov show -color ./a.out
-instr-profile=a.profdata -debug-only=coverage-mapping
main:
File 0, 3:12 -> 7:2 = #0
Expansion,File 0, 5:5 -> 5:6 = #0 (Expanded file = 1)
File 1, 4:15 -> 4:24 = #0
File 1, 4:15 -> 4:24 = #0
File 1, 4:15 -> 4:24 = #0
File 1, 4:15 -> 4:24 = #0
Counter in file 0 3:12 -> 7:2, #0
Counter in file 0 5:5 -> 5:6, Expands to file 1
Counter in file 1 4:15 -> 4:24, #0
Counter in file 1 4:15 -> 4:24, #0
Counter in file 1 4:15 -> 4:24, #0
Counter in file 1 4:15 -> 4:24, #0
Emitting segments for file:
/usr/local/google/home/zequanwu/llvm-project/build/master/b.cpp
Combined regions:
3:12 -> 7:2 (count=1)
4:15 -> 4:24 (count=4)
5:5 -> 5:6 (count=1)
Segment at 3:12 (count = 1), RegionEntry
Segment at 4:15 (count = 4), RegionEntry
Segment at 4:24 (count = 1)
Segment at 5:5 (count = 1), RegionEntry
Segment at 5:6 (count = 1)
Segment at 7:2 (count = 0), Skipped
1| |#include <iostream>
2| |
3| 1|int main() {
4| 4| #define O std::cout
5| 1| O << "" << "" << "";
6| 1| return 0;
7| 1|}</pre>
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