# cpp-stub

**Repository Path**: wcp_code/cpp-stub

## Basic Information

- **Project Name**: cpp-stub
- **Description**: No description available
- **Primary Language**: Unknown
- **License**: MIT
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2025-11-27
- **Last Updated**: 2025-11-27

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

![building and running workflow](https://github.com/coolxv/cpp-stub/actions/workflows/make-test-multi-platform.yml/badge.svg)

[中文](README_zh.md)|[English](README.md)

# Principle
- How to get the original function address (**addr_pri.h**, **addr_any.h**)
- How to replace the original function with stub function (**stub.h**)

# Supported
- Supported operating systems:
  * [x] Windows
  * [x] Linux
  * [x] MacOS(x86-64, printf '\x07' | dd of=test_function bs=1 seek=160 count=1 conv=notrunc)
- Supported hardware platform: 
  * [x] x86
  * [x] x86-64
  * [x] arm32
  * [x] arm64
  * [x] arm thumb
  * [x] riscv32
  * [x] riscv64
  * [x] loongarch64
  * [x] mips64
  * [x] ppc64 (Generated by chatgpt and requires verification)
  * [x] s390x (Generated by chatgpt and requires verification)
  * [x] alpha (Generated by chatgpt and requires verification)
  * [x] sparc (Generated by chatgpt and requires verification)
  * [x] sw_64 (Generated by chatgpt and requires verification)
- Supported compiler: 
  * [x] msvc
  * [x] gcc
  * [x] clang
- Support function type:
  * [x] [normal function](test/test_function.cpp)
  * [x] [variadic function]((test/test_variadic_function.cpp))
  * [x] [template function](test/test_template_function_linux.cpp)
  * [x] [overload function](test/test_overload_function_linux.cpp)
  * [x] [lambda](test/test_addr_lambda_linux.cpp)
  * [x] [static function(use addr_any.h)](test/test_addr_any_linux.cpp)
  * [x] inline function(use compiler options)
  * [x] [constructor function](test/test_constructor_function_linux.cpp)
  * [x] [destructor function](test/test_dtor_function_linux.cpp)
  * [x] [member function](test/test_object_member_function_linux.cpp)
  * [x] [static member function](test/test_class_member_function.cpp)
  * [x] [virtual function(not pure)](test/test_virtual_function_linux.cpp)
  * [x] [virtual and overload function](test/test_virtual_overload_function_linux.cpp)
  * [x] [functor](test/test_functor_linux.cpp)
  * [x] [private member function(use addr_pri.h)](test/test_private_member_function_linux.cpp)
  * [x] [private member function(cpp17)](test_cpp17/test_private_member.cpp)
  * [x] function in the dynamic library(use dlsym())



# Description of the unit test
## Cannot stub
- Can't stub the exit function, the compiler has made special optimizations.
- Can't stub pure virtual functions, pure virtual functions not have the address.
- Can't stub lambda functions, lambda functions not get the address.(You can try to use addr_any.h api.)
- Can't stub static functions, static function address is not visible.(You can try to use addr_any.h api.)


## Unit test compilation option for linux g++
- -fno-access-control
- -fno-inline
- -Wno-pmf-conversions
- -Wl,--allow-multiple-definition
- -no-pie -fno-stack-protector
- -fprofile-arcs
- -ftest-coverage

## Code coverage statistics for linux g++
```
lcov -d build/ -z
lcov -d build/ -b ../../src1 --no-external -rc lcov_branch_coverage=1 -t ut -c -o ut_1.info
lcov -d build/ -b ../../src2 --no-external -rc lcov_branch_coverage=1 -t ut -c -o ut_2.info
lcov -a ut_1.info -a ut_2.info -o ut.info
genhtml -o report/ --prefix=`pwd` --branch-coverage --function-coverage ut.info
```
## Code coverage statistics for windows

 [OpenCppCoverage](https://github.com/OpenCppCoverage/OpenCppCoverage)
```
OpenCppCoverage.exe --sources MySourcePath* -- YourProgram.exe arg1 arg2
```
# Interface description

## stub.h
```
Stub stub
stub.set(addr, addr_stub)
stub.reset(addr)
```

## addr_pri.h
```
Declaration:
    ACCESS_PRIVATE_FIELD(ClassName, TypeName, FieldName)
    ACCESS_PRIVATE_FUN(ClassName, TypeName, FunName)
    ACCESS_PRIVATE_STATIC_FIELD(ClassName, TypeName, FieldName)
    ACCESS_PRIVATE_STATIC_FUN(ClassName, TypeName, FunName)

Use:
    access_private_field::ClassNameFieldName(object);
    access_private_static_field::ClassName::ClassNameFieldName();
    call_private_fun::ClassNameFunName(object,parameters...);
    call_private_static_fun::ClassName::ClassNameFunName(parameters...);
    get_private_fun::ClassNameFunName();
    get_private_static_fun::ClassName::ClassNameFunName();
```

## addr_any.h(linux)
```
AddrAny any //for exe
AddrAny any(libname) //for lib

int get_local_func_addr_symtab(std::string func_name_regex_str, std::map<std::string,void*>& result)
int get_global_func_addr_symtab(std::string func_name_regex_str, std::map<std::string,void*>& result)
int get_weak_func_addr_symtab(std::string func_name_regex_str, std::map<std::string,void*>& result)

int get_global_func_addr_dynsym( std::string func_name_regex_str, std::map<std::string,void*>& result)
int get_weak_func_addr_dynsym(std::string func_name_regex_str, std::map<std::string,void*>& result)

```
## addr_any.h(windows)
```
AddrAny any //for all
int get_func_addr(std::string func_name, std::map<std::string,void*>& result)
```
## addr_any.h(darwin)
```
not implement
```