In devices without storage media, you can export data to the
command line and then generate the corresponding gcda file
It can save the result output by calling __gcov_info_to_gcda
The usage is similar to:
https://gcc.gnu.org/onlinedocs/gcc/Freestanding-Environments.html#Profiling-and-Test-Coverage-in-Freestanding-Environments
Usage:
./tools/configure.sh qemu-armv7a:nsh
Modify the configuration
+CONFIG_COVERAGE_ALL=y
+CONFIG_COVERAGE_MINI=y
+CONFIG_SYSTEM_GCOV=y
Run:
qemu-system-arm -cpu cortex-a7 -nographic -smp 4 \
-machine virt,virtualization=off,gic-version=2 \
-net none -chardev stdio,id=con,mux=on -serial chardev:con \
-mon chardev=con,mode=readline -kernel ./nuttx/nuttx -semihosting -s | tee gcov.txt
./nuttx/tools/gcov_convert.py -i ./gcov.txt
./nuttx/tools/gcov.sh -t arm-none-eabi-gcov
Signed-off-by: yinshengkai <yinshengkai@xiaomi.com>
Currently, there are four code coverage statistics implementations:
1. GCC native implementation
2. CLANG native implementation
3. GCC coverage nuttx mini version
4. CLANG coverage nuttx mini version
Coverage Support:
GCC native implementation CLANG native implementation GCC coverage nuttx mini version CLANG coverage nuttx mini version
Compiler version requirements ALL ALL GCC 13.2 and below CLANG 17.0 and below
Program coverage statistics support Main program √ √ √ √
Program coverage statistics support Interrupt program X √ √ √
Configuration options CONFIG_COVERAGE_TOOLCHAIN CONFIG_COVERAGE_COMPILER_RT CONFIG_COVERAGE_MINI CONFIG_COVERAGE_MINI
Platform Support ARM √ √ √ √
ARM64 √ √
(Coming soon, not yet merged)
Signed-off-by: wangmingrong1 <wangmingrong1@xiaomi.com>
1. Excerpted from: https://github.com/ARM-software/LLVM-embedded-toolchain-for-Arm/blob/main/samples/src/cpp-baremetal-semihosting-prof/proflib.c
2. Since llvm profile supports more than just gcov, and some features have not yet been explored, two clang gcov implementations are supported after this patch
3. Using this lib only supports the gcov compilation options of "-fprofile-instr-generate -fcoverage-mapping"
4. This file is heavily dependent on the compiler clang version, and is currently aligned with ci, supporting 17.0.1 and below. 18 and above are not supported by this library due to different internal implementations of the compiler
Signed-off-by: wangmingrong1 <wangmingrong1@xiaomi.com>
1. bin and kbin folders are dynamically generated
2. Context comes before depend, so the bin and kbin folders are created in the context construction phase. When the depend process comes, each library is downloaded, and a relative bin/xxx and kbin/xxx directory is created for each library to place files. This is to prevent duplicate file names.
Signed-off-by: wangmingrong1 <wangmingrong1@xiaomi.com>
1. Since the implementation of gcov has changed since clang17, versions before clang17 need to use the libunwind.a file
Signed-off-by: wangmingrong1 <wangmingrong1@xiaomi.com>
1. enable CONFIG_BUILTIN_COMPILER_RT to built libclang_rt.builtins-xxx.a and no longer use the compiler's built-in
2. Modify clang version acquisition to get two decimal points
3. It has been ported to support four architectures: ARM, ARM64, RISCV, and x86_64, among which ARM has been validated
Signed-off-by: wangmingrong1 <wangmingrong1@xiaomi.com>
