gcov: Support for the most streamlined profile of LLVM-embedded-toolc…

…hain-for-Arm

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 <[email protected]>

libs/libc/Kconfig

@@ -14,6 +14,7 @@ source "libs/libc/string/Kconfig"
 source "libs/libc/pthread/Kconfig"
 source "libs/libc/dlfcn/Kconfig"
 source "libs/libc/modlib/Kconfig"
+source "libs/libc/gcov/Kconfig"
 source "libs/libc/gdbstub/Kconfig"
 source "libs/libc/grp/Kconfig"
 source "libs/libc/pwd/Kconfig"

libs/libc/Makefile

@@ -32,6 +32,7 @@ include dlfcn/Make.defs
 include errno/Make.defs
 include eventfd/Make.defs
 include fixedmath/Make.defs
+include gcov/Make.defs
 include gdbstub/Make.defs
 include grp/Make.defs
 include gnssutils/Make.defs

libs/libc/gcov/CMakeLists.txt

@@ -0,0 +1,27 @@
+# ##############################################################################
+# libs/libc/gcov/CMakeLists.txt
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more contributor
+# license agreements.  See the NOTICE file distributed with this work for
+# additional information regarding copyright ownership.  The ASF licenses this
+# file to you under the Apache License, Version 2.0 (the "License"); you may not
+# use this file except in compliance with the License.  You may obtain a copy of
+# the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations under
+# the License.
+#
+# ##############################################################################
+
+if(CONFIG_GCOV_LIB_SOURCE_NUTTX)
+  if(CONFIG_ARCH_TOOLCHAIN_CLANG)
+    target_sources(c PRIVATE lib_clang.c)
+  endif()
+endif()

libs/libc/gcov/Kconfig

@@ -0,0 +1,34 @@
+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
+
+config LIB_GCOV
+	tristate "Enable GCOV support"
+	select HAVE_CXXINITIALIZE
+	default n
+	---help---
+		Enable GCOV support for code coverage analysis.
+		After turning on this option, code coverage can be analyzed.
+		If this option is enabled, image size and performance will be
+		significantly reduced. Before use, you need to add the
+		"-fprofile-instr-generate -fcoverage-mapping" compilation parameters
+		to the file to be analyzed.
+
+choice
+
+prompt "Select GCOV library source"
+	default GCOV_LIB_SOURCE_NUTTX
+
+config GCOV_LIB_SOURCE_TOOLCHAINS
+	bool "Toolchains"
+	select COMPILER_RT_PROFILE if ARCH_TOOLCHAIN_CLANG
+	---help---
+		Use the GCOV library source provided by the toolchain.
+
+config GCOV_LIB_SOURCE_NUTTX
+	bool "NuttX"
+	---help---
+		Use the NuttX GCOV library source.
+
+endchoice

libs/libc/gcov/Make.defs

@@ -0,0 +1,34 @@
+############################################################################
+# libs/libc/gcov/Make.defs
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+# Add the fixed precision math C files to the build
+
+ifeq ($(CONFIG_GCOV_LIB_SOURCE_NUTTX),y)
+	ifeq ($(CONFIG_ARCH_TOOLCHAIN_CLANG),y)
+		CSRCS += lib_clang.c
+	endif
+endif
+
+# Add the fixed precision math directory to the build
+
+DEPPATH += --dep-path gcov
+VPATH += :gcov