381e9d2386
Frontends emit 'unused' coverage mapping records for functions which are
provably unused in a TU. These unused records contain a single counter
with CounterKind::Zero. However, a function may be unused in one TU and
used in another. When this happens, prefer the records with a full set
of counters instead of arbitrarily picking the first loaded record.
There is no impact on the single-TU case. In the multiple-TU case, this
resolves issues causing a function to appear unused when it's not.
Testing: check-{llvm,clang,compiler-rt}
rdar://42981322
llvm-svn: 339194
54 lines
1.7 KiB
C++
54 lines
1.7 KiB
C++
// 1) Compile shared code into different object files and into an executable.
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// RUN: %clangxx_profgen -fcoverage-mapping %s -c -o %t.v1.o -D_VERSION_1
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// RUN: %clangxx_profgen -fcoverage-mapping %s -c -o %t.v2.o -D_VERSION_2
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// RUN: %clangxx_profgen -fcoverage-mapping %t.v1.o %t.v2.o -o %t.exe
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// 2) Collect profile data.
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// RUN: env LLVM_PROFILE_FILE=%t.profraw %run %t.exe
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// RUN: llvm-profdata merge %t.profraw -o %t.profdata
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// 3) Generate coverage reports from the different object files and the exe.
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// RUN: llvm-cov show %t.v1.o -instr-profile=%t.profdata | FileCheck %s -check-prefixes=V1,V1-ONLY
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// RUN: llvm-cov show %t.v2.o -instr-profile=%t.profdata | FileCheck %s -check-prefixes=V2,V2-ONLY
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// RUN: llvm-cov show %t.v1.o -object %t.v2.o -instr-profile=%t.profdata | FileCheck %s -check-prefixes=V1,V2
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// RUN: llvm-cov show %t.exe -instr-profile=%t.profdata | FileCheck %s -check-prefixes=V1,V2
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// 4) Verify that coverage reporting on the aggregate coverage mapping shows
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// hits for all code. (We used to arbitrarily pick a mapping from one binary
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// and prefer it over others.) When only limited coverage information is
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// available (just from one binary), don't try to guess any region counts.
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struct A {
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A() {} // V1: [[@LINE]]{{ *}}|{{ *}}1
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// V1-ONLY: [[@LINE+1]]{{ *}}|{{ *}}|
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A(int) {} // V2-ONLY: [[@LINE-2]]{{ *}}|{{ *}}|
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// V2: [[@LINE-1]]{{ *}}|{{ *}}1
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};
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#ifdef _VERSION_1
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void foo();
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void bar() {
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A x; // V1: [[@LINE]]{{ *}}|{{ *}}1
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}
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int main() {
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foo(); // V1: [[@LINE]]{{ *}}|{{ *}}1
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bar();
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return 0;
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}
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#endif // _VERSION_1
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#ifdef _VERSION_2
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void foo() {
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A x{0}; // V2: [[@LINE]]{{ *}}|{{ *}}1
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}
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#endif // _VERSION_2
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