cmake: compiler: Add func_instrumentation flag

Adds a new compiler flag to enable function instrumentation injection
at compile time for compilers that support it.

Adds support for this flag to GCC when `CONFIG_INSTRUMENTATION` is
enabled, setting the `-finstrument-functions` flag during compilation.

Signed-off-by: Kevin Townsend <[email protected]>
Signed-off-by: Gustavo Romero <[email protected]>
Signed-off-by: Maciej Sobkowski <[email protected]>

Author: microbuilder

CMakeLists.txt

@@ -578,6 +578,24 @@ zephyr_compile_options($<$<COMPILE_LANGUAGE:CXX>:$<TARGET_PROPERTY:compiler,no_p
 zephyr_link_libraries_ifndef(CONFIG_NATIVE_LIBRARY
                              $<TARGET_PROPERTY:linker,no_position_independent>)
 
+if(CONFIG_INSTRUMENTATION)
+  # @Intent: Enable function instrumentation injection at compile time
+  zephyr_compile_options($<$<COMPILE_LANGUAGE:C>:$<TARGET_PROPERTY:compiler,func_instrumentation>>)
+  zephyr_compile_options($<$<COMPILE_LANGUAGE:CXX>:$<TARGET_PROPERTY:compiler,func_instrumentation>>)
+
+  # @Intent: Enable function blocklist for the instrumentation subsystem
+  if(CONFIG_INSTRUMENTATION_EXCLUDE_FUNCTION_LIST)
+    zephyr_compile_options($<$<COMPILE_LANGUAGE:C>:$<TARGET_PROPERTY:compiler,func_instrumentation_exclude_function_list>>)
+    zephyr_compile_options($<$<COMPILE_LANGUAGE:CXX>:$<TARGET_PROPERTY:compiler,func_instrumentation_exclude_function_list>>)
+  endif()
+
+  # @Intent: Enable file blocklist for the instrumentation subsystem
+  if(CONFIG_INSTRUMENTATION_EXCLUDE_FILE_LIST)
+    zephyr_compile_options($<$<COMPILE_LANGUAGE:C>:$<TARGET_PROPERTY:compiler,func_instrumentation_exclude_file_list>>)
+    zephyr_compile_options($<$<COMPILE_LANGUAGE:CXX>:$<TARGET_PROPERTY:compiler,func_instrumentation_exclude_file_list>>)
+  endif()
+endif()
+
 # Allow the user to inject options when calling cmake, e.g.
 # 'cmake -DEXTRA_CFLAGS="-Werror -Wno-deprecated-declarations" ..'
 include(cmake/extra_flags.cmake)

cmake/compiler/compiler_flags_template.cmake

@@ -171,3 +171,6 @@ set_compiler_property(PROPERTY no_function_sections)
 
 # Compiler flag for not placing variables in their own sections:
 set_compiler_property(PROPERTY no_data_sections)
+
+# Compiler flag to enable function instrumentation
+set_compiler_property(PROPERTY func_instrumentation)

cmake/compiler/gcc/compiler_flags.cmake

@@ -279,3 +279,10 @@ set_compiler_property(PROPERTY no_function_sections "-fno-function-sections")
 
 # Compiler flag for not placing variables in their own sections:
 set_compiler_property(PROPERTY no_data_sections "-fno-data-sections")
+
+# Compiler flag to enable function instrumentation
+set_compiler_property(PROPERTY func_instrumentation "-finstrument-functions")
+set_compiler_property(PROPERTY func_instrumentation_exclude_function_list
+  "-finstrument-functions-exclude-function-list=${CONFIG_INSTRUMENTATION_EXCLUDE_FUNCTION_LIST}")
+set_compiler_property(PROPERTY func_instrumentation_exclude_file_list
+  "-finstrument-functions-exclude-file-list=${CONFIG_INSTRUMENTATION_EXCLUDE_FILE_LIST}")