http://llvm.org/bugs/show_bug.cgi?id=22531
Bug ID: 22531
Summary: Coverage mapping: Malformed profile data
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Environment+Setup:
llvm revision: r228136
clang Last Changed Rev: 228121
build: Debug+Asserts
OS: ubuntu 14.04
Steps to Reproduce:
test1.c: NOT OK
==================
#include <stdio.h>
static int foo() { return 42; }
int main() {
return 0;
}
==================
cp src/test1.c src/test.c; rm -fr default.profraw test.profdata ;
clang -c -o obj/test.o src/test.c -I -g -O0 -fprofile-instr-generate
-fcoverage-mapping; clang -o bin/test obj/test.o -I -g -O0
-fprofile-instr-generate -fcoverage-mapping; ./bin/test ;
llvm-profdata merge -o test.profdata default.profraw; llvm-cov show
./bin/test -instr-profile=test.profdata
error: Failed to load coverage: Malformed profile data
test2.c: OK
==================
#include <stdio.h>
static int foo() { return 42; }
int main() {
return foo();
}
==================
cp src/test2.c src/test.c; rm -fr default.profraw test.profdata ;
clang -c -o obj/test.o src/test.c -I -g -O0 -fprofile-instr-generate
-fcoverage-mapping; clang -o bin/test obj/test.o -I -g -O0
-fprofile-instr-generate -fcoverage-mapping; ./bin/test ;
llvm-profdata merge -o test.profdata default.profraw; llvm-cov show
./bin/test -instr-profile=test.profdata
/home/xeioex/workspace/clang/experiments/llvm-cov/test/src/test.c:
| 1|#include <stdio.h>
| 2|
1| 3|static int foo() { return 42; }
1| 4|int main() {
1| 5| return foo();
1| 6|}
test3.c: OK
==================
#include <stdio.h>
int foo() { return 42; }
int main() {
return 0;
}
==================
cp src/test3.c src/test.c; rm -fr default.profraw test.profdata ;
clang -c -o obj/test.o src/test.c -I -g -O0 -fprofile-instr-generate
-fcoverage-mapping; clang -o bin/test obj/test.o -I -g -O0
-fprofile-instr-generate -fcoverage-mapping; ./bin/test ;
llvm-profdata merge -o test.profdata default.profraw; llvm-cov show
./bin/test -instr-profile=test.profdata
/home/xeioex/workspace/clang/experiments/llvm-cov/test/src/test.c:
| 1|#include <stdio.h>
| 2|
0| 3|int foo() { return 42; }
1| 4|int main() {
1| 5| return 0;
1| 6|}
Preliminary investigations:
AFAICU, the issue somehow related to the unused non-void static functions.
The error raised because of llvm/lib/ProfileData/CoverageMappingReader.cpp
(SectionData::get) expects that function names are located inside
__llvm_prf_names section but it not true in case of test1.c, instead some of
the function names are located inside .rodata section.
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