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cr.h
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/*
# cr.h
A single file header-only live reload solution for C, written in C++:
- simple public API, 3 functions to use only (and another to export);
- works and tested on Linux, MacOSX and Windows;
- automatic crash protection;
- automatic static state transfer;
- based on dynamic reloadable binary (.so/.dylib/.dll);
- support multiple plugins;
- MIT licensed;
NOTE: The only file that matters in this repository is `cr.h`.
This file contains the documentation in markdown, the license, the implementation and the public api.
All other files in this repository are supporting files and can be safely ignored.
### Building cr - Using vcpkg
You can download and install cr using the [vcpkg](https://github.com/Microsoft/vcpkg) dependency manager:
git clone https://github.com/Microsoft/vcpkg.git
cd vcpkg
./bootstrap-vcpkg.sh
./vcpkg integrate install
./vcpkg install cr
The cr port in vcpkg is kept up to date by Microsoft team members and community contributors. If the version is out of date, please [create an issue or pull request](https://github.com/Microsoft/vcpkg) on the vcpkg repository.
### Example
A (thin) host application executable will make use of `cr` to manage
live-reloading of the real application in the form of dynamic loadable binary, a host would be something like:
```c
#define CR_HOST // required in the host only and before including cr.h
#include "../cr.h"
int main(int argc, char *argv[]) {
// the host application should initalize a plugin with a context, a plugin
cr_plugin ctx;
// the full path to the live-reloadable application
cr_plugin_open(ctx, "c:/path/to/build/game.dll");
// call the update function at any frequency matters to you, this will give
// the real application a chance to run
while (!cr_plugin_update(ctx)) {
// do anything you need to do on host side (ie. windowing and input stuff?)
}
// at the end do not forget to cleanup the plugin context
cr_plugin_close(ctx);
return 0;
}
```
While the guest (real application), would be like:
```c
CR_EXPORT int cr_main(struct cr_plugin *ctx, enum cr_op operation) {
assert(ctx);
switch (operation) {
case CR_LOAD: return on_load(...); // loading back from a reload
case CR_UNLOAD: return on_unload(...); // preparing to a new reload
case CR_CLOSE: ...; // the plugin will close and not reload anymore
}
// CR_STEP
return on_update(...);
}
```
### Changelog
#### 2020-04-19
- Added a failure `CR_INITIAL_FAILURE`. If the initial plugin crashes, the host must determine the next path, and we will not reload
the broken plugin.
#### 2020-01-09
- Deprecated `cr_plugin_load` in favor to `cr_plugin_open` for consistency with `cr_plugin_close`. See issue #49.
- Minor documentation improvements.
#### 2018-11-17
- Support to OSX finished, thanks to MESH Consultants Inc.
- Added a new possible failure `CR_BAD_IMAGE` in case the binary file is stil not ready even if its timestamp changed. This could happen if generating the file (compiler or copying) was slow.
- Windows: Fix issue with too long paths causing the PDB patch process to fail, causing the reload process to fail.
- **Possible breaking change:** Fix rollback flow. Before, during a rollback (for any reason) two versions were decremented one-shot so that the in following load, the version would bump again getting us effectively on the previous version, but in some cases not related to crashes this wasn't completely valid (see `CR_BAD_IMAGE`). Now the version is decremented one time in the crash handler and then another time during the rollback and then be bumped again. A rollback due an incomplete image will not incorrectly rollback two versions, it will continue at the same version retrying the load until the image is valid (copy or compiler finished writing to it). This may impact current uses of `cr` if the `version` info is used during `CR_UNLOAD` as it will now be a different value.
### Samples
Two simple samples can be found in the `samples` directory.
The first is one is a simple console application that demonstrate some basic static
states working between instances and basic crash handling tests. Print to output
is used to show what is happening.
The second one demonstrates how to live-reload an opengl application using
[Dear ImGui](https://github.com/ocornut/imgui). Some state lives in the host
side while most of the code is in the guest side.
#### Running Samples and Tests
The samples and tests uses the [fips build system](https://github.com/floooh/fips). It requires Python and CMake.
```
$ ./fips build # will generate and build all artifacts
$ ./fips run crTest # To run tests
$ ./fips run imgui_host # To run imgui sample
# open a new console, then modify imgui_guest.cpp
$ ./fips make imgui_guest # to build and force imgui sample live reload
```
### Documentation
#### `int (*cr_main)(struct cr_plugin *ctx, enum cr_op operation)`
This is the function pointer to the dynamic loadable binary entry point function.
Arguments
- `ctx` pointer to a context that will be passed from `host` to the `guest` containing valuable information about the current loaded version, failure reason and user data. For more info see `cr_plugin`.
- `operation` which operation is being executed, see `cr_op`.
Return
- A negative value indicating an error, forcing a rollback to happen and failure
being set to `CR_USER`. 0 or a positive value that will be passed to the
`host` process.
#### `bool cr_plugin_open(cr_plugin &ctx, const char *fullpath)`
Loads and initialize the plugin.
Arguments
- `ctx` a context that will manage the plugin internal data and user data.
- `fullpath` full path with filename to the loadable binary for the plugin or
`NULL`.
Return
- `true` in case of success, `false` otherwise.
#### `void cr_set_temporary_path(cr_plugin& ctx, const std::string &path)`
Sets temporary path to which temporary copies of plugin will be placed. Should be called
immediately after `cr_plugin_open()`. If `temporary` path is not set, temporary copies of
the file will be copied to the same directory where the original file is located.
Arguments
- `ctx` a context that will manage the plugin internal data and user data.
- `path` a full path to an existing directory which will be used for storing temporary plugin copies.
#### `int cr_plugin_update(cr_plugin &ctx, bool reloadCheck = true)`
This function will call the plugin `cr_main` function. It should be called as
frequently as the core logic/application needs.
Arguments
- `ctx` the current plugin context data.
- `reloadCheck` optional: do a disk check (stat()) to see if the dynamic library needs a reload.
Return
- -1 if a failure happened during an update;
- -2 if a failure happened during a load or unload;
- anything else is returned directly from the plugin `cr_main`.
#### `void cr_plugin_close(cr_plugin &ctx)`
Cleanup internal states once the plugin is not required anymore.
Arguments
- `ctx` the current plugin context data.
#### `cr_op`
Enum indicating the kind of step that is being executed by the `host`:
- `CR_LOAD` A load caused by reload is being executed, can be used to restore any
saved internal state.
- `CR_STEP` An application update, this is the normal and most frequent operation;
- `CR_UNLOAD` An unload for reloading the plugin will be executed, giving the
application one chance to store any required data;
- `CR_CLOSE` Used when closing the plugin, This works like `CR_UNLOAD` but no `CR_LOAD`
should be expected afterwards;
#### `cr_plugin`
The plugin instance context struct.
- `p` opaque pointer for internal cr data;
- `userdata` may be used by the user to pass information between reloads;
- `version` incremetal number for each succeded reload, starting at 1 for the
first load. **The version will change during a crash handling process**;
- `failure` used by the crash protection system, will hold the last failure error
code that caused a rollback. See `cr_failure` for more info on possible values;
#### `cr_failure`
If a crash in the loadable binary happens, the crash handler will indicate the
reason of the crash with one of these:
- `CR_NONE` No error;
- `CR_SEGFAULT` Segmentation fault. `SIGSEGV` on Linux/OSX or
`EXCEPTION_ACCESS_VIOLATION` on Windows;
- `CR_ILLEGAL` In case of illegal instruction. `SIGILL` on Linux/OSX or
`EXCEPTION_ILLEGAL_INSTRUCTION` on Windows;
- `CR_ABORT` Abort, `SIGBRT` on Linux/OSX, not used on Windows;
- `CR_MISALIGN` Bus error, `SIGBUS` on Linux/OSX or `EXCEPTION_DATATYPE_MISALIGNMENT`
on Windows;
- `CR_BOUNDS` Is `EXCEPTION_ARRAY_BOUNDS_EXCEEDED`, Windows only;
- `CR_STACKOVERFLOW` Is `EXCEPTION_STACK_OVERFLOW`, Windows only;
- `CR_STATE_INVALIDATED` Static `CR_STATE` management safety failure;
- `CR_BAD_IMAGE` The plugin is not a valid image (i.e. the compiler may still
writing it);
- `CR_OTHER` Other signal, Linux only;
- `CR_USER` User error (for negative values returned from `cr_main`);
#### `CR_HOST` define
This define should be used before including the `cr.h` in the `host`, if `CR_HOST`
is not defined, `cr.h` will work as a public API header file to be used in the
`guest` implementation.
Optionally `CR_HOST` may also be defined to one of the following values as a way
to configure the `safety` operation mode for automatic static state management
(`CR_STATE`):
- `CR_SAFEST` Will validate address and size of the state data sections during
reloads, if anything changes the load will rollback;
- `CR_SAFE` Will validate only the size of the state section, this mean that the
address of the statics may change (and it is best to avoid holding any pointer
to static stuff);
- `CR_UNSAFE` Will validate nothing but that the size of section fits, may not
be necessarelly exact (growing is acceptable but shrinking isn't), this is the
default behavior;
- `CR_DISABLE` Completely disable automatic static state management;
#### `CR_STATE` macro
Used to tag a global or local static variable to be saved and restored during a reload.
Usage
`static bool CR_STATE bInitialized = false;`
#### Overridable macros
You can define these macros before including cr.h in host (CR_HOST) to customize cr.h
memory allocations and other behaviours:
- `CR_MAIN_FUNC`: changes 'cr_main' symbol to user-defined function name. default: #define CR_MAIN_FUNC "cr_main"
- `CR_ASSERT`: override assert. default: #define CA_ASSERT(e) assert(e)
- `CR_REALLOC`: override libc's realloc. default: #define CR_REALLOC(ptr, size) ::realloc(ptr, size)
- `CR_MALLOC`: override libc's malloc. default: #define CR_MALLOC(size) ::malloc(size)
- `CR_FREE`: override libc's free. default: #define CR_FREE(ptr) ::free(ptr)
- `CR_DEBUG`: outputs debug messages in CR_ERROR, CR_LOG and CR_TRACE
- `CR_ERROR`: logs debug messages to stderr. default (CR_DEBUG only): #define CR_ERROR(...) fprintf(stderr, __VA_ARGS__)
- `CR_LOG`: logs debug messages. default (CR_DEBUG only): #define CR_LOG(...) fprintf(stdout, __VA_ARGS__)
- `CR_TRACE`: prints function calls. default (CR_DEBUG only): #define CR_TRACE(...) fprintf(stdout, "CR_TRACE: %s\n", __FUNCTION__)
### FAQ / Troubleshooting
#### Q: Why?
A: Read about why I made this [here](https://fungos.github.io/blog/2017/11/20/cr.h-a-simple-c-hot-reload-header-only-library/).
#### Q: My application asserts/crash when freeing heap data allocated inside the dll, what is happening?
A: Make sure both your application host and your dll are using the dynamic
run-time (/MD or /MDd) as any data allocated in the heap must be freed with
the same allocator instance, by sharing the run-time between guest and
host you will guarantee the same allocator is being used.
#### Q: Can we load multiple plugins at the same time?
A: Yes. This should work without issues on Windows. On Linux and OSX there may be
issues with crash handling
#### Q: You said this wouldn't lock my PDB, but it still locks! Why?
If you had to load the dll before `cr` for any reason, Visual Studio may still hold a lock to the PDB. You may be having [this issue](https://github.com/fungos/cr/issues/12) and the solution is [here](https://stackoverflow.com/questions/38427425/how-to-force-visual-studio-2015-to-unlock-pdb-file-after-freelibrary-call).
#### Q: Hot-reload is not working at all, what I'm doing wrong?
First, be sure that your build system is not interfering by somewhat still linking to your shared library. There are so many things that can go wrong and you need to be sure only `cr` will deal with your shared library. On linux, for more info on how to find what is happening, check [this issue](https://github.com/fungos/cr/issues/9).
#### Q: How much can I change things in the plugin without risking breaking everything?
`cr` is `C` reloader and dealing with C it assume simple things will mostly work.
The problem is how the linker will decide do rearrange things accordingly the amount of changes you do in the code. For incremental and localized changes I never had any issues, in general I hardly had any issues at all by writing normal C code. Now, when things start to become more complex and bordering C++, it becomes riskier. If you need do complex things, I suggest checking [RCCPP](https://github.com/RuntimeCompiledCPlusPlus/RuntimeCompiledCPlusPlus) and reading [this PDF](http://www.gameaipro.com/GameAIPro/GameAIPro_Chapter15_Runtime_Compiled_C++_for_Rapid_AI_Development.pdf) and my original blog post about `cr` [here](https://fungos.github.io/blog/2017/11/20/cr.h-a-simple-c-hot-reload-header-only-library/).
With all these information you'll be able to decide which is better to your use case.
### `cr` Sponsors
#### [MESH Consultants Inc.](http://meshconsultants.ca/)
**For sponsoring the port of `cr` to the MacOSX.**
### Contributors
[Danny Grein](https://github.com/fungos)
[Rokas Kupstys](https://github.com/rokups)
[Noah Rinehart](https://github.com/noahrinehart)
[Niklas Lundberg](https://github.com/datgame)
[Sepehr Taghdisian](https://github.com/septag)
[Robert Gabriel Jakabosky](https://github.com/neopallium)
[@pixelherodev](https://github.com/pixelherodev)
[Alexander](https://github.com/clibequilibrium)
### Contributing
We welcome *ALL* contributions, there is no minor things to contribute with, even one letter typo fixes are welcome.
The only things we require is to test thoroughly, maintain code style and keeping documentation up-to-date.
Also, accepting and agreeing to release any contribution under the same license.
----
### License
The MIT License (MIT)
Copyright (c) 2017 Danny Angelo Carminati Grein
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
----
### Source
<details>
<summary>View Source Code</summary>
```c
*/
#ifndef __CR_H__
#define __CR_H__
//
// Global OS specific defines/customizations
//
#if defined(_WIN32)
#define CR_WINDOWS
#define CR_PLUGIN(name) "" name ".dll"
#elif defined(__linux__)
#define CR_LINUX
#define CR_PLUGIN(name) "lib" name ".so"
#elif defined(__APPLE__)
#define CR_OSX
#define CR_PLUGIN(name) "lib" name ".dylib"
#else
#error "Unknown/unsupported platform, please open an issue if you think this \
platform should be supported."
#endif // CR_WINDOWS || CR_LINUX || CR_OSX
//
// Global compiler specific defines/customizations
//
#if defined(_MSC_VER)
#if defined(__cplusplus)
#define CR_EXPORT extern "C" __declspec(dllexport)
#define CR_IMPORT extern "C" __declspec(dllimport)
#else
#define CR_EXPORT __declspec(dllexport)
#define CR_IMPORT __declspec(dllimport)
#endif
#endif // defined(_MSC_VER)
#if defined(__GNUC__) // clang & gcc
#if defined(__cplusplus)
#define CR_EXPORT extern "C" __attribute__((visibility("default")))
#else
#define CR_EXPORT __attribute__((visibility("default")))
#endif
#define CR_IMPORT
#endif // defined(__GNUC__)
#if defined(__MINGW32__)
#undef CR_EXPORT
#if defined(__cplusplus)
#define CR_EXPORT extern "C" __declspec(dllexport)
#else
#define CR_EXPORT __declspec(dllexport)
#endif
#endif
// cr_mode defines how much we validate global state transfer between
// instances. The default is CR_UNSAFE, you can choose another mode by
// defining CR_HOST, ie.: #define CR_HOST CR_SAFEST
enum cr_mode {
CR_SAFEST = 0, // validate address and size of the state section, if
// anything changes the load will rollback
CR_SAFE = 1, // validate only the size of the state section, this means
// that address is assumed to be safe if avoided keeping
// references to global/static states
CR_UNSAFE = 2, // don't validate anything but that the size of the section
// fits, may not be identical though
CR_DISABLE = 3 // completely disable the auto state transfer
};
// cr_op is passed into the guest process to indicate the current operation
// happening so the process can manage its internal data if it needs.
enum cr_op {
CR_LOAD = 0,
CR_STEP = 1,
CR_UNLOAD = 2,
CR_CLOSE = 3,
};
enum cr_failure {
CR_NONE, // No error
CR_SEGFAULT, // SIGSEGV / EXCEPTION_ACCESS_VIOLATION
CR_ILLEGAL, // illegal instruction (SIGILL) / EXCEPTION_ILLEGAL_INSTRUCTION
CR_ABORT, // abort (SIGBRT)
CR_MISALIGN, // bus error (SIGBUS) / EXCEPTION_DATATYPE_MISALIGNMENT
CR_BOUNDS, // EXCEPTION_ARRAY_BOUNDS_EXCEEDED
CR_STACKOVERFLOW, // EXCEPTION_STACK_OVERFLOW
CR_STATE_INVALIDATED, // one or more global data section changed and does
// not safely match basically a failure of
// cr_plugin_validate_sections
CR_BAD_IMAGE, // The binary is not valid - compiler is still writing it
CR_INITIAL_FAILURE, // Plugin version 1 crashed, cannot rollback
CR_OTHER, // Unknown or other signal,
CR_USER = 0x100,
};
struct cr_plugin;
typedef int (*cr_plugin_main_func)(struct cr_plugin *ctx, enum cr_op operation);
// public interface for the plugin context, this has some user facing
// variables that may be used to manage reload feedback.
// - userdata may be used by the user to pass information between reloads
// - version is the reload counter (after loading the first instance it will
// be 1, not 0)
// - failure is the (platform specific) last error code for any crash that may
// happen to cause a rollback reload used by the crash protection system
struct cr_plugin {
void *p;
void *userdata;
unsigned int version;
enum cr_failure failure;
unsigned int next_version;
unsigned int last_working_version;
};
#ifndef CR_HOST
// Guest specific compiler defines/customizations
#if defined(_MSC_VER)
#pragma section(".state", read, write)
#define CR_STATE __declspec(allocate(".state"))
#endif // defined(_MSC_VER)
#if defined(CR_OSX)
#define CR_STATE __attribute__((used, section("__DATA,__state")))
#else
#if defined(__GNUC__) // clang & gcc
#define CR_STATE __attribute__((section(".state")))
#endif // defined(__GNUC__)
#endif
#else // #ifndef CR_HOST
// Overridable macros
#ifndef CR_LOG
# ifdef CR_DEBUG
# include <stdio.h>
# define CR_LOG(...) fprintf(stdout, __VA_ARGS__)
# else
# define CR_LOG(...)
# endif
#endif
#ifndef CR_ERROR
# ifdef CR_DEBUG
# include <stdio.h>
# define CR_ERROR(...) fprintf(stderr, __VA_ARGS__)
# else
# define CR_ERROR(...)
# endif
#endif
#ifndef CR_TRACE
# ifdef CR_DEBUG
# include <stdio.h>
# define CR_TRACE fprintf(stdout, "CR_TRACE: %s\n", __FUNCTION__);
# else
# define CR_TRACE
# endif
#endif
#ifndef CR_MAIN_FUNC
# define CR_MAIN_FUNC "cr_main"
#endif
#ifndef CR_ASSERT
# include <assert.h>
# define CR_ASSERT(e) assert(e)
#endif
#ifndef CR_REALLOC
# include <stdlib.h>
# define CR_REALLOC(ptr, size) ::realloc(ptr, size)
#endif
#ifndef CR_FREE
# include <stdlib.h>
# define CR_FREE(ptr) ::free(ptr)
#endif
#ifndef CR_MALLOC
# include <stdlib.h>
# define CR_MALLOC(size) ::malloc(size)
#endif
#if defined(_MSC_VER)
// we should probably push and pop this
# pragma warning(disable:4003) // not enough actual parameters for macro 'identifier'
#endif
#define CR_DO_EXPAND(x) x##1337
#define CR_EXPAND(x) CR_DO_EXPAND(x)
#if CR_EXPAND(CR_HOST) == 1337
#define CR_OP_MODE CR_UNSAFE
#else
#define CR_OP_MODE CR_HOST
#endif
#include <algorithm>
#include <chrono> // duration for sleep
#include <cstring> // memcpy
#include <string>
#include <thread> // this_thread::sleep_for
#if defined(CR_WINDOWS)
#define CR_PATH_SEPARATOR '\\'
#define CR_PATH_SEPARATOR_INVALID '/'
#else
#define CR_PATH_SEPARATOR '/'
#define CR_PATH_SEPARATOR_INVALID '\\'
#endif
static void cr_split_path(std::string path, std::string &parent_dir,
std::string &base_name, std::string &ext) {
std::replace(path.begin(), path.end(), CR_PATH_SEPARATOR_INVALID,
CR_PATH_SEPARATOR);
auto sep_pos = path.rfind(CR_PATH_SEPARATOR);
auto dot_pos = path.rfind('.');
if (sep_pos == std::string::npos) {
parent_dir = "";
if (dot_pos == std::string::npos) {
ext = "";
base_name = path;
} else {
ext = path.substr(dot_pos);
base_name = path.substr(0, dot_pos);
}
} else {
parent_dir = path.substr(0, sep_pos + 1);
if (dot_pos == std::string::npos || sep_pos > dot_pos) {
ext = "";
base_name = path.substr(sep_pos + 1);
} else {
ext = path.substr(dot_pos);
base_name = path.substr(sep_pos + 1, dot_pos - sep_pos - 1);
}
}
}
static std::string cr_version_path(const std::string &basepath,
unsigned version,
const std::string &temppath) {
std::string folder, fname, ext;
cr_split_path(basepath, folder, fname, ext);
std::string ver = std::to_string(version);
#if defined(_MSC_VER)
// When patching PDB file path in library file we will drop path and leave only file name.
// Length of path is extra space for version number. Trim file name only if version number
// length exceeds pdb folder path length. This is not relevant on other platforms.
if (ver.size() > folder.size()) {
fname = fname.substr(0, fname.size() - (ver.size() - folder.size() - 1));
}
#endif
if (!temppath.empty()) {
folder = temppath;
}
return folder + fname + ver + ext;
}
namespace cr_plugin_section_type {
enum e { state, bss, count };
}
namespace cr_plugin_section_version {
enum e { backup, current, count };
}
struct cr_plugin_section {
cr_plugin_section_type::e type = {};
intptr_t base = 0;
char *ptr = 0;
int64_t size = 0;
void *data = nullptr;
};
struct cr_plugin_segment {
char *ptr = 0;
int64_t size = 0;
};
// keep track of some internal state about the plugin, should not be messed
// with by user
struct cr_internal {
std::string fullname = {};
std::string temppath = {};
time_t timestamp = {};
void *handle = nullptr;
cr_plugin_main_func main = nullptr;
cr_plugin_segment seg = {};
cr_plugin_section data[cr_plugin_section_type::count]
[cr_plugin_section_version::count] = {};
cr_mode mode = CR_SAFEST;
};
static bool cr_plugin_section_validate(cr_plugin &ctx,
cr_plugin_section_type::e type,
intptr_t vaddr, intptr_t ptr,
int64_t size);
static void cr_plugin_sections_reload(cr_plugin &ctx,
cr_plugin_section_version::e version);
static void cr_plugin_sections_store(cr_plugin &ctx);
static void cr_plugin_sections_backup(cr_plugin &ctx);
static void cr_plugin_reload(cr_plugin &ctx);
static int cr_plugin_unload(cr_plugin &ctx, bool rollback, bool close);
static bool cr_plugin_changed(cr_plugin &ctx);
static bool cr_plugin_rollback(cr_plugin &ctx);
static int cr_plugin_main(cr_plugin &ctx, cr_op operation);
void cr_set_temporary_path(cr_plugin &ctx, const std::string &path) {
auto pimpl = (cr_internal *)ctx.p;
pimpl->temppath = path;
}
#if defined(CR_WINDOWS)
// clang-format off
#ifndef WIN32_LEAN_AND_MEAN
# define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
#include <dbghelp.h>
// clang-format on
#if defined(_MSC_VER)
#pragma comment(lib, "dbghelp.lib")
#endif
using so_handle = HMODULE;
#ifdef UNICODE
# define CR_WINDOWS_ConvertPath(_newpath, _path) std::wstring _newpath(cr_utf8_to_wstring(_path))
static std::wstring cr_utf8_to_wstring(const std::string &str) {
int wlen = MultiByteToWideChar(CP_UTF8, 0, str.c_str(), -1, 0, 0);
wchar_t wpath_small[MAX_PATH];
std::unique_ptr<wchar_t[]> wpath_big;
wchar_t *wpath = wpath_small;
if (wlen > _countof(wpath_small)) {
wpath_big = std::unique_ptr<wchar_t[]>(new wchar_t[wlen]);
wpath = wpath_big.get();
}
if (MultiByteToWideChar(CP_UTF8, 0, str.c_str(), -1, wpath, wlen) != wlen) {
return L"";
}
return wpath;
}
#else
# define CR_WINDOWS_ConvertPath(_newpath, _path) const std::string &_newpath = _path
#endif // UNICODE
static time_t cr_last_write_time(const std::string &path) {
CR_WINDOWS_ConvertPath(_path, path);
WIN32_FILE_ATTRIBUTE_DATA fad;
if (!GetFileAttributesEx(_path.c_str(), GetFileExInfoStandard, &fad)) {
return -1;
}
if (fad.nFileSizeHigh == 0 && fad.nFileSizeLow == 0) {
return -1;
}
LARGE_INTEGER time;
time.HighPart = fad.ftLastWriteTime.dwHighDateTime;
time.LowPart = fad.ftLastWriteTime.dwLowDateTime;
return static_cast<time_t>(time.QuadPart / 10000000 - 11644473600LL);
}
static bool cr_exists(const std::string &path) {
CR_WINDOWS_ConvertPath(_path, path);
return GetFileAttributes(_path.c_str()) != INVALID_FILE_ATTRIBUTES;
}
static bool cr_copy(const std::string &from, const std::string &to) {
CR_WINDOWS_ConvertPath(_from, from);
CR_WINDOWS_ConvertPath(_to, to);
return CopyFile(_from.c_str(), _to.c_str(), FALSE) ? true : false;
}
static void cr_del(const std::string& path) {
CR_WINDOWS_ConvertPath(_path, path);
DeleteFile(_path.c_str());
}
// If using Microsoft Visual C/C++ compiler we need to do some workaround the
// fact that the compiled binary has a fullpath to the PDB hardcoded inside
// it. This causes a lot of headaches when trying compile while debugging as
// the referenced PDB will be locked by the debugger.
// To solve this problem, we patch the binary to rename the PDB to something
// we know will be unique to our in-flight instance, so when debugging it will
// lock this unique PDB and the compiler will be able to overwrite the
// original one.
#if defined(_MSC_VER)
#include <crtdbg.h>
#include <limits.h>
#include <stdio.h>
#include <tchar.h>
static std::string cr_replace_extension(const std::string &filepath,
const std::string &ext) {
std::string folder, filename, old_ext;
cr_split_path(filepath, folder, filename, old_ext);
return folder + filename + ext;
}
template <class T>
static T struct_cast(void *ptr, LONG offset = 0) {
return reinterpret_cast<T>(reinterpret_cast<intptr_t>(ptr) + offset);
}
// RSDS Debug Information for PDB files
using DebugInfoSignature = DWORD;
#define CR_RSDS_SIGNATURE 'SDSR'
struct cr_rsds_hdr {
DebugInfoSignature signature;
GUID guid;
long version;
char filename[1];
};
static bool cr_pe_debugdir_rva(PIMAGE_OPTIONAL_HEADER optionalHeader,
DWORD &debugDirRva, DWORD &debugDirSize) {
if (optionalHeader->Magic == IMAGE_NT_OPTIONAL_HDR64_MAGIC) {
auto optionalHeader64 =
struct_cast<PIMAGE_OPTIONAL_HEADER64>(optionalHeader);
debugDirRva =
optionalHeader64->DataDirectory[IMAGE_DIRECTORY_ENTRY_DEBUG]
.VirtualAddress;
debugDirSize =
optionalHeader64->DataDirectory[IMAGE_DIRECTORY_ENTRY_DEBUG].Size;
} else {
auto optionalHeader32 =
struct_cast<PIMAGE_OPTIONAL_HEADER32>(optionalHeader);
debugDirRva =
optionalHeader32->DataDirectory[IMAGE_DIRECTORY_ENTRY_DEBUG]
.VirtualAddress;
debugDirSize =
optionalHeader32->DataDirectory[IMAGE_DIRECTORY_ENTRY_DEBUG].Size;
}
if (debugDirRva == 0 && debugDirSize == 0) {
return true;
} else if (debugDirRva == 0 || debugDirSize == 0) {
return false;
}
return true;
}
static bool cr_pe_fileoffset_rva(PIMAGE_NT_HEADERS ntHeaders, DWORD rva,
DWORD &fileOffset) {
bool found = false;
auto *sectionHeader = IMAGE_FIRST_SECTION(ntHeaders);
for (int i = 0; i < ntHeaders->FileHeader.NumberOfSections;
i++, sectionHeader++) {
auto sectionSize = sectionHeader->Misc.VirtualSize;
if ((rva >= sectionHeader->VirtualAddress) &&
(rva < sectionHeader->VirtualAddress + sectionSize)) {
found = true;
break;
}
}
if (!found) {
return false;
}
const int diff = static_cast<int>(sectionHeader->VirtualAddress -
sectionHeader->PointerToRawData);
fileOffset = rva - diff;
return true;
}
static char *cr_pdb_find(LPBYTE imageBase, PIMAGE_DEBUG_DIRECTORY debugDir) {
CR_ASSERT(debugDir && imageBase);
LPBYTE debugInfo = imageBase + debugDir->PointerToRawData;
const auto debugInfoSize = debugDir->SizeOfData;
if (debugInfo == 0 || debugInfoSize == 0) {
return nullptr;
}
if (IsBadReadPtr(debugInfo, debugInfoSize)) {
return nullptr;
}
if (debugInfoSize < sizeof(DebugInfoSignature)) {
return nullptr;
}
if (debugDir->Type == IMAGE_DEBUG_TYPE_CODEVIEW) {
auto signature = *(DWORD *)debugInfo;
if (signature == CR_RSDS_SIGNATURE) {
auto *info = (cr_rsds_hdr *)(debugInfo);
if (IsBadReadPtr(debugInfo, sizeof(cr_rsds_hdr))) {
return nullptr;
}
if (IsBadStringPtrA((const char *)info->filename, UINT_MAX)) {
return nullptr;
}
return info->filename;
}
}
return nullptr;
}
static bool cr_pdb_replace(const std::string &filename, const std::string &pdbname,
std::string &orig_pdb) {
CR_WINDOWS_ConvertPath(_filename, filename);
HANDLE fp = nullptr;
HANDLE filemap = nullptr;
LPVOID mem = 0;
bool result = false;
do {
fp = CreateFile(_filename.c_str(), GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ, nullptr, OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL, nullptr);
if ((fp == INVALID_HANDLE_VALUE) || (fp == nullptr)) {
break;
}
filemap = CreateFileMapping(fp, nullptr, PAGE_READWRITE, 0, 0, nullptr);
if (filemap == nullptr) {
break;
}
mem = MapViewOfFile(filemap, FILE_MAP_ALL_ACCESS, 0, 0, 0);
if (mem == nullptr) {
break;
}
auto dosHeader = struct_cast<PIMAGE_DOS_HEADER>(mem);
if (dosHeader == 0) {
break;
}
if (IsBadReadPtr(dosHeader, sizeof(IMAGE_DOS_HEADER))) {
break;
}
if (dosHeader->e_magic != IMAGE_DOS_SIGNATURE) {
break;
}
auto ntHeaders =
struct_cast<PIMAGE_NT_HEADERS>(dosHeader, dosHeader->e_lfanew);
if (ntHeaders == 0) {
break;
}
if (IsBadReadPtr(ntHeaders, sizeof(ntHeaders->Signature))) {
break;
}
if (ntHeaders->Signature != IMAGE_NT_SIGNATURE) {
break;
}
if (IsBadReadPtr(&ntHeaders->FileHeader, sizeof(IMAGE_FILE_HEADER))) {
break;
}
if (IsBadReadPtr(&ntHeaders->OptionalHeader,
ntHeaders->FileHeader.SizeOfOptionalHeader)) {
break;
}
if (ntHeaders->OptionalHeader.Magic != IMAGE_NT_OPTIONAL_HDR32_MAGIC &&
ntHeaders->OptionalHeader.Magic != IMAGE_NT_OPTIONAL_HDR64_MAGIC) {
break;
}
auto sectionHeaders = IMAGE_FIRST_SECTION(ntHeaders);
if (IsBadReadPtr(sectionHeaders,
ntHeaders->FileHeader.NumberOfSections *
sizeof(IMAGE_SECTION_HEADER))) {
break;
}
DWORD debugDirRva = 0;
DWORD debugDirSize = 0;
if (!cr_pe_debugdir_rva(&ntHeaders->OptionalHeader, debugDirRva,
debugDirSize)) {
break;
}
if (debugDirRva == 0 || debugDirSize == 0) {
break;
}
DWORD debugDirOffset = 0;
if (!cr_pe_fileoffset_rva(ntHeaders, debugDirRva, debugDirOffset)) {
break;
}
auto debugDir =
struct_cast<PIMAGE_DEBUG_DIRECTORY>(mem, debugDirOffset);
if (debugDir == 0) {
break;
}
if (IsBadReadPtr(debugDir, debugDirSize)) {
break;
}
if (debugDirSize < sizeof(IMAGE_DEBUG_DIRECTORY)) {
break;
}
int numEntries = debugDirSize / sizeof(IMAGE_DEBUG_DIRECTORY);
if (numEntries == 0) {
break;
}
for (int i = 1; i <= numEntries; i++, debugDir++) {
char *pdb = cr_pdb_find((LPBYTE)mem, debugDir);
if (pdb) {
auto len = strlen(pdb);
if (len >= strlen(pdbname.c_str())) {
orig_pdb = pdb;
memcpy_s(pdb, len, pdbname.c_str(), pdbname.length());
pdb[pdbname.length()] = 0;
result = true;
}
}
}
} while (0);