gcov: use original libgcov.a with redefined symbols

This commit is contained in:
Alexey Lapshin 2022-12-12 16:00:24 +07:00
parent 0da15a7a19
commit 21d7fd9b03
3 changed files with 74 additions and 9 deletions

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@ -1,8 +1,16 @@
set(srcs
"app_trace.c"
"app_trace_util.c"
"host_file_io.c"
"gcov/gcov_rtio.c")
"host_file_io.c")
if(CONFIG_APPTRACE_GCOV_ENABLE)
if("${CMAKE_C_COMPILER_ID}" STREQUAL "GNU")
list(APPEND srcs
"gcov/gcov_rtio.c")
else()
fail_at_build_time(app_trace "Only GNU compiler can link with Gcov library")
endif()
endif()
set(include_dirs "include")
@ -54,13 +62,49 @@ idf_component_register(SRCS "${srcs}"
REQUIRES esp_timer
LDFRAGMENTS linker.lf)
# disable --coverage for this component, as it is used as transport
# for gcov
target_compile_options(${COMPONENT_LIB} PRIVATE "-fno-profile-arcs" "-fno-test-coverage")
# Force app_trace to also appear later than gcov in link line
idf_component_get_property(app_trace app_trace COMPONENT_LIB)
target_link_libraries(${COMPONENT_LIB} INTERFACE $<TARGET_FILE:${app_trace}> gcov $<TARGET_FILE:${app_trace}> c)
if(CONFIG_APPTRACE_GCOV_ENABLE)
# The original Gcov library from toolchain will be objcopy with symbols redefinitions (see file gcov/io_sym.map).
# This needs because ESP has no file-system onboard, and redefined functions solves this problem and transmits
# output file to host PC.
# Set a name for Gcov library
set(GCOV_LIB libgcov_rtio)
# Set include direcrory of Gcov internal headers
execute_process(COMMAND ${CMAKE_C_COMPILER} -print-file-name=plugin
OUTPUT_VARIABLE gcc_plugin_dir
OUTPUT_STRIP_TRAILING_WHITESPACE
ERROR_QUIET)
set_source_files_properties(gcov/gcov_rtio.c
PROPERTIES COMPILE_FLAGS "-I${gcc_plugin_dir}/include")
# Copy libgcov.a with symbols redefinition
find_library(GCOV_LIBRARY_PATH gcov ${CMAKE_C_IMPLICIT_LINK_DIRECTORIES})
add_custom_command(OUTPUT ${GCOV_LIB}.a
COMMAND ${_CMAKE_TOOLCHAIN_PREFIX}objcopy
--redefine-syms ${CMAKE_CURRENT_LIST_DIR}/gcov/io_sym.map
${GCOV_LIBRARY_PATH} ${GCOV_LIB}.a
MAIN_DEPENDENCY ${GCOV_LIBRARY_PATH}
VERBATIM)
add_custom_target(${GCOV_LIB}_target DEPENDS ${GCOV_LIB}.a)
add_library(${GCOV_LIB} STATIC IMPORTED)
set_target_properties(${GCOV_LIB}
PROPERTIES
IMPORTED_LOCATION ${CMAKE_CURRENT_BINARY_DIR}/${GCOV_LIB}.a)
add_dependencies(${GCOV_LIB} ${GCOV_LIB}_target)
add_dependencies(${COMPONENT_LIB} ${GCOV_LIB})
# disable --coverage for this component, as it is used as transport for gcov
target_compile_options(${COMPONENT_LIB} PRIVATE "-fno-profile-arcs" "-fno-test-coverage")
target_link_options(${COMPONENT_LIB} INTERFACE "-Wl,--wrap=__gcov_init")
target_link_libraries(${COMPONENT_LIB} INTERFACE ${GCOV_LIB} $<TARGET_FILE:${app_trace}> c)
else()
target_link_libraries(${COMPONENT_LIB} INTERFACE $<TARGET_FILE:${app_trace}> c)
endif()
# This function adds a dependency on the given component if the component is included into the build.
function(maybe_add_component component_name)

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@ -103,7 +103,7 @@ static int esp_dbg_stub_gcov_entry(void)
return ESP_OK;
}
int gcov_rtio_atexit(void (*function)(void) __attribute__ ((unused)))
void gcov_rtio_init(void)
{
uint32_t capabilities = 0;
ESP_EARLY_LOGV(TAG, "%s", __FUNCTION__);
@ -112,7 +112,6 @@ int gcov_rtio_atexit(void (*function)(void) __attribute__ ((unused)))
esp_dbg_stub_entry_set(ESP_DBG_STUB_ENTRY_CAPABILITIES, capabilities | ESP_DBG_STUB_CAP_GCOV_TASK);
}
esp_register_freertos_tick_hook(gcov_create_task_tick_hook);
return ESP_OK;
}
void esp_gcov_dump(void)
@ -172,4 +171,19 @@ long gcov_rtio_ftell(void *stream)
ESP_EARLY_LOGV(TAG, "%s(%p) = %ld", __FUNCTION__, stream, ret);
return ret;
}
void gcov_rtio_setbuf(void *arg1 __attribute__ ((unused)), void *arg2 __attribute__ ((unused)))
{
return;
}
/* Wrappers for Gcov functions */
extern void __real___gcov_init(void *info);
void __wrap___gcov_init(void *info)
{
__real___gcov_init(info);
gcov_rtio_init();
}
#endif

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@ -0,0 +1,7 @@
fopen gcov_rtio_fopen
fclose gcov_rtio_fclose
fwrite gcov_rtio_fwrite
fread gcov_rtio_fread
fseek gcov_rtio_fseek
ftell gcov_rtio_ftell
setbuf gcov_rtio_setbuf