代码分析:Lightspark

Lightspark是一款开源的Flash播放器,支持ActionScript 3并采用JIT编译技术将ActionScript编译为x86字节码。此外,它还利用OpenGL Shaders实现硬件加速渲染,提供了一个全新的、多线程优化的代码库。
[b]Lightspark:[/b]
Open Source Flash Player

[b]feature:[/b]
[list]
[*]JIT compilation of ActionScript to native x86 bytecode using LLVM
[*]Hardware accelerated rendering using OpenGL Shaders (GLSL)
[*]Very good and robust support for current-generation ActionScript 3
A new, clean, codebase exploiting multithreading and optimized for
modern hardware. Designed from scratch after the official Flash
documentation was released.
[/list]

[b]官网:[/b]
[url]http://lightspark.sourceforge.net/[/url]

[b]论文:[/b]
对虚拟机感兴趣的,作者的论文一定要好好读读,写的非常精彩
[url]http://lightspark.sourceforge.net/lightspark-thesys.pdf[/url]

[b]TODO:[/b]
LLVM一点都不了解,汗!
所以只简要分析了解释执行部分,待看完LLVM相关资料,再补上
# 显式查找 PCL 及其特定模块 find_package(PCL 1.14.1 REQUIRED COMPONENTS common io) include_directories(${PCL_INCLUDE_DIRS}) link_directories(${PCL_LIBRARY_DIRS}) add_definitions(${PCL_DEFINITIONS}) add_executable(pcl_version_check pcl_version_check.cpp) target_link_libraries(pcl_version_check ${PCL_LIBRARIES}) D:\QT_project\untitled1\CMakeLists.txt:56: error: Call stack: D:/QT_project/untitled1/CMakeLists.txt:56 (find_package) D:/QT_project/untitled1/build/Desktop_Qt_6_8_3_MSVC2022_64bit-Debug/.qtc/package-manager/maintenance_tool_provider.cmake:322 (find_package) D:/LightSpark/QT__/PCL1.14.1/cmake/PCLConfig.cmake:559 (find_external_library) D:/LightSpark/QT__/PCL1.14.1/cmake/PCLConfig.cmake:294 (find_boost) D:/LightSpark/QT__/PCL1.14.1/cmake/PCLConfig.cmake:121 (find_package) D:/QT_project/untitled1/CMakeLists.txt:56 (find_package) D:/QT_project/untitled1/build/Desktop_Qt_6_8_3_MSVC2022_64bit-Debug/.qtc/package-manager/maintenance_tool_provider.cmake:322 (find_package) D:/LightSpark/QT__/PCL1.14.1/cmake/PCLConfig.cmake:559 (find_external_library) D:/LightSpark/QT__/PCL1.14.1/cmake/PCLConfig.cmake:294 (find_boost) D:/LightSpark/QT__/PCL1.14.1/cmake/PCLConfig.cmake:121 (find_package) D:/QT_project/untitled1/CMakeLists.txt:56 (find_package) D:/QT_project/untitled1/build/Desktop_Qt_6_8_3_MSVC2022_64bit-Debug/.qtc/package-manager/maintenance_tool_provider.cmake:322 (find_package) D:/LightSpark/QT__/PCL1.14.1/cmake/PCLConfig.cmake:559 (find_external_library) D:/LightSpark/QT__/PCL1.14.1/cmake/PCLConfig.cmake:294 (find_boost) D:/LightSpark/QT__/PCL1.14.1/cmake/PCLConfig.cmake:121 (find_package) D:/QT_project/untitled1/CMakeLists.txt:62 (add_executable) :-1: error: The command "D:\QT\Tools\CMake_64\bin\cmake.exe -S D:/QT_project/untitled1 -B D:/QT_project/untitled1/build/Desktop_Qt_6_8_3_MSVC2022_64bit-Debug" terminated with exit code 1. :-1: error: CMake returned error code: 1
07-11
find_package(PCL 1.14.1 REQUIRED) if (WIN32) target_compile_definitions(${PROJECT_NAME} PRIVATE NOMINMAX) endif() target_link_libraries(${PROJECT_NAME} PRIVATE ${PCL_LIBRARIES}) D:\QT_project\untitled1\CMakeLists.txt:51: warning: Call stack: D:/QT_project/untitled1/CMakeLists.txt:51 (find_package) D:/QT_project/untitled1/build/Desktop_Qt_6_8_3_MSVC2022_64bit-Debug/.qtc/package-manager/maintenance_tool_provider.cmake:322 (find_package) D:/LightSpark/QT__/PCL1.14.1/cmake/PCLConfig.cmake:556 (find_external_library) D:/LightSpark/QT__/PCL1.14.1/cmake/PCLConfig.cmake:300 (find_qhull) D:/LightSpark/QT__/PCL1.14.1/cmake/PCLConfig.cmake:155 (find_package) D:/QT_project/untitled1/CMakeLists.txt:51 (find_package) D:/QT_project/untitled1/build/Desktop_Qt_6_8_3_MSVC2022_64bit-Debug/.qtc/package-manager/maintenance_tool_provider.cmake:322 (find_package) D:/LightSpark/QT__/PCL1.14.1/cmake/PCLConfig.cmake:559 (find_external_library) D:/LightSpark/QT__/PCL1.14.1/cmake/PCLConfig.cmake:294 (find_boost) D:/LightSpark/QT__/PCL1.14.1/cmake/PCLConfig.cmake:121 (find_package) D:/QT_project/untitled1/CMakeLists.txt:51 (find_package) D:/QT_project/untitled1/build/Desktop_Qt_6_8_3_MSVC2022_64bit-Debug/.qtc/package-manager/maintenance_tool_provider.cmake:322 (find_package) D:/LightSpark/QT__/PCL1.14.1/cmake/PCLConfig.cmake:559 (find_external_library) D:/LightSpark/QT__/PCL1.14.1/cmake/PCLConfig.cmake:298 (find_flann) D:/LightSpark/QT__/PCL1.14.1/cmake/PCLConfig.cmake:253 (find_package) D:/QT_project/untitled1/build/Desktop_Qt_6_8_3_MSVC2022_64bit-Debug/.qtc/package-manager/maintenance_tool_provider.cmake:322 (find_package) D:/LightSpark/QT__/PCL1.14.1/cmake/Modules/FindFLANN.cmake:45 (find_package) D:/QT_project/untitled1/CMakeLists.txt:51 (find_package) D:/QT_project/untitled1/build/Desktop_Qt_6_8_3_MSVC2022_64bit-Debug/.qtc/package-manager/maintenance_tool_provider.cmake:322 (find_package) D:/LightSpark/QT__/PCL1.14.1/cmake/PCLConfig.cmake:559 (find_external_library) D:/LightSpark/QT__/PCL1.14.1/cmake/PCLConfig.cmake:294 (find_boost) D:/LightSpark/QT__/PCL1.14.1/cmake/PCLConfig.cmake:121 (find_package) D:/QT_project/untitled1/CMakeLists.txt:51 (find_package) D:/QT_project/untitled1/build/Desktop_Qt_6_8_3_MSVC2022_64bit-Debug/.qtc/package-manager/maintenance_tool_provider.cmake:322 (find_package) D:/LightSpark/QT__/PCL1.14.1/cmake/PCLConfig.cmake:559 (find_external_library) D:/LightSpark/QT__/PCL1.14.1/cmake/PCLConfig.cmake:294 (find_boost) D:/LightSpark/QT__/PCL1.14.1/cmake/PCLConfig.cmake:121 (find_package) D:/QT_project/untitled1/build/Desktop_Qt_6_8_3_MSVC2022_64bit-Debug/.qtc/package-manager/maintenance_tool_provider.cmake:322 (find_package)
最新发布
07-11
在使用 CMake 配置 PCL(Point Cloud Library)1.14.1 时,用户可能会遇到 `find_package(PCL REQUIRED)` 触发的警告信息。这类问题通常与 CMake 无法正确找到 PCL 的配置文件有关,可能的原因和解决方案如下: ### 警告原因分析 1. **PCL 安装路径未被 CMake 正确识别** 当通过 `find_package(PCL REQUIRED)` 查找 PCL 时,CMake 会尝试从默认路径或环境变量中寻找 `PCLConfig.cmake` 或 `pcl-config.cmake` 文件。如果 PCL 是手动安装或安装路径不在系统环境变量中,则可能导致 CMake 找不到相关配置。 2. **缺少必要的编译定义或组件依赖** PCL 的模块化结构要求在调用 `find_package` 时指定所需的子模块(如 `PCL_COMMON`, `PCL_IO` 等),否则可能引发警告或错误[^1]。 3. **版本不兼容或路径错误** 在某些情况下,PCL 安装过程中生成的 `.cmake` 文件可能没有正确设置,或者使用的 CMake 版本与 PCL 不兼容。 --- ### 解决方案 #### 方法一:显式指定 PCL 的安装路径 在调用 CMake 时,通过 `-D` 参数显式指定 PCL 的安装路径。例如: ```bash cmake -DPCL_DIR=/usr/local/share/pcl-1.14 .. ``` 这将引导 CMake 到指定目录查找 `PCLConfig.cmake` 文件,从而避免路径问题。 #### 方法二:修改 `CMakeLists.txt` 中的 `find_package` 调用 可以明确列出需要的 PCL 模块,以确保只加载必要的组件,并减少潜在冲突: ```cmake find_package(PCL 1.14 REQUIRED COMPONENTS common io) ``` 此方式不仅有助于定位具体模块,还能提高构建效率并减少不必要的依赖引入。 #### 方法三:检查并设置环境变量 确保系统环境变量 `PKG_CONFIG_PATH` 和 `CMAKE_PREFIX_PATH` 包含了 PCL 的安装路径。例如: ```bash export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig:$PKG_CONFIG_PATH export CMAKE_PREFIX_PATH=/usr/local:$CMAKE_PREFIX_PATH ``` 这些设置可以帮助 CMake 和 pkg-config 工具链正确识别 PCL 的位置。 #### 方法四:验证 PCL 安装完整性 运行以下命令确认 PCL 是否已正确安装: ```bash pkg-config --modversion pcl_common ``` 如果返回正确的版本号(如 1.14.1),则说明 PCL 安装无误;否则应重新安装或修复 PCL。 --- ### 示例修正后的 `CMakeLists.txt` ```cmake cmake_minimum_required(VERSION 3.5 FATAL_ERROR) project(pcl_version_check) set(CMAKE_CXX_STANDARD 14) # 显式查找 PCL 及其特定模块 find_package(PCL 1.14 REQUIRED COMPONENTS common io) include_directories(${PCL_INCLUDE_DIRS}) link_directories(${PCL_LIBRARY_DIRS}) add_definitions(${PCL_DEFINITIONS}) add_executable(pcl_version_check pcl_version_check.cpp) target_link_libraries(pcl_version_check ${PCL_LIBRARIES}) ``` 上述修改可以有效解决因模块缺失或路径不正确导致的 `find_package` 警告。 ---
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