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compile-analysis This skill should be used when the user asks to "分析编译效率", "分析编译时间", "查看头文件依赖", "保存编译命令", "提取编译命令", "生成编译脚本", "保存这个文件的编译命令", "单独编译这个文件", "编译单个文件", "单编文件", "独立编译文件", "分析这个文件的头文件依赖", "头文件依赖关系", "这个文件依赖了多少头文件", "analyze compilation", "check header dependencies", "分析文件编译开销", "save compile command", "extract compile command", "generate compile script", "compile single file", "compile individual file", "standalone compile", "analyze header dependencies", "header dependency tree", "how many header files", or mentions analyzing compilation performance, build times, include dependencies, extracting/saving compilation commands, generating standalone compilation scripts, compiling individual files in isolation, or analyzing header file dependency relationships for specific source files in the ace_engine project. Provides comprehensive compilation efficiency analysis including timing, resource usage, dependency tree visualization with automatic saving, the ability to save reusable compilation scripts with performance moni
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name compile-analysis description This skill should be used when the user asks to "分析编译效率", "分析编译时间", "查看头文件依赖", "保存编译命令", "提取编译命令", "生成编译脚本", "保存这个文件的编译命令", "单独编译这个文件", "编译单个文件", "单编文件", "独立编译文件", "分析这个文件的头文件依赖", "头文件依赖关系", "这个文件依赖了多少头文件", "analyze compilation", "check header dependencies", "分析文件编译开销", "save compile command", "extract compile command", "generate compile script", "compile single file", "compile individual file", "standalone compile", "analyze header dependencies", "header dependency tree", "how many header files", or mentions analyzing compilation performance, build times, include dependencies, extracting/saving compilation commands, generating standalone compilation scripts, compiling individual files in isolation, or analyzing header file dependency relationships for specific source files in the ace_engine project. Provides comprehensive compilation efficiency analysis including timing, resource usage, dependency tree visualization with automatic saving, the ability to save reusable compilation scripts with performance monitoring, and standalone compilation capabilities using generated scripts. version 0.2.0
Compilation Efficiency Analysis Skill
Analyze compilation efficiency for individual source files in the ACE Engine project. This skill provides detailed insights into compilation time, resource overhead, and header file dependencies to help identify optimization opportunities.
Overview
Compilation analysis helps identify performance bottlenecks in the build process by measuring:
Compilation time - How long a file takes to compileResource overhead - Peak memory usage during compilationHeader dependencies - Tree structure of included headers
Critical Requirements :
⚠️ The analyze_compile.sh script can be executed from the current project directory
⚠️ Extracted compilation commands MUST be executed in the out/{product} directory (not from the project root)
⚠️ All analysis results MUST be based on actual execution - no speculation or estimation
⚠️ Header dependencies MUST be parsed using the built-in parse_ii.py script to analyze .ii files - do not use alternative methods
Investigating slow compilation times
Identifying files with excessive dependencies
Optimizing build performance
Understanding include relationships
Analysis Workflow
Step 1: Locate Source File Identify the target source file for analysis. Source files in ace_engine typically follow patterns:
frameworks/core/components_ng/base/frame_node.cppframeworks/bridge/declarative_frontend/engine/js_engine.cpp
Step 2: Find OpenHarmony Root The analysis scripts automatically locate the OpenHarmony root directory by searching for the .gn file marker. Navigate to the OpenHarmony root directory to ensure proper path resolution.
Step 3: Choose Analysis Mode Option A: Full Analysis (Execute + Display Results)
./.claude/skills/compile-analysis/scripts/analyze_compile.sh <source-file> [product-name]
./.claude/skills/compile-analysis/scripts/analyze_compile.sh frameworks/core/components_ng/base/frame_node.cpp rk3568
Option B: Save Reusable Compilation Script
Generate a standalone script that can be executed multiple times for performance testing:
./.claude/skills/compile-analysis/scripts/analyze_compile.sh <source-file> [product-name] --save-script
This creates out/{product}/compile_single_file_{name}.sh with:
Automatic environment setup
Performance monitoring (time + memory)
Generation of .ii and .o files
Repeatable execution for benchmarking
Step 4: Interpret Results The analysis produces three key outputs:
Compilation command - Full compiler command with all flagsPerformance metrics :
Elapsed time (format: MM:SS.mm)
Peak memory usage in KB
Dependency tree - Hierarchical view of header inclusions When using --save-script, a reusable script is generated for repeated performance testing.
Key Scripts
analyze_compile.sh (Main Script) Primary entry point for compilation analysis. Orchestrates the entire analysis workflow:
./.claude/skills/compile-analysis/scripts/analyze_compile.sh <source-file> [product-name]
./.claude/skills/compile-analysis/scripts/analyze_compile.sh <source-file> [product-name] --save-script
source-file - Path to the source file (relative to ace_engine root or absolute)product-name - Target product (default: rk3568)--save-script - Save enhanced compilation command to reusable script file
Extracts compilation command from ninja build files
Generates enhanced compilation command with instrumentation
(Optional) Saves script to out/{product}/compile_single_file_{name}.sh
Executes compilation with time and memory profiling
Parses .ii preprocessed file to extract dependencies
Displays comprehensive results
Output with --save-script :
Generates a standalone bash script at out/{product}/compile_single_file_{name}.sh
Script includes automatic environment setup
Performance monitoring (compilation time + peak memory)
Can be executed multiple times for performance comparisons
Useful for benchmarking and optimization validation
get_compile_command.py Extracts the complete compilation command for a source file from the ninja build system.
Usage (from ace_engine root) :
python3 ./.claude/skills/compile-analysis/scripts/get_compile_command.py \
<source-file> <openharmony_root>/out/<product>
python3 ./.claude/skills/compile-analysis/scripts/get_compile_command.py \
<source-file> <openharmony_root>/out/<product> --save-enhanced
python3 ./.claude/skills/compile-analysis/scripts/get_compile_command.py \
frameworks/core/components_ng/base/frame_node.cpp \
/home/sunfei/workspace/openHarmony/out/rk3568 --save-enhanced
Parses ninja build files to locate compilation rules
Extracts compiler flags, defines, and include paths
Generates two versions:
Original command (with ccache for development)
Enhanced command (without ccache, with -save-temps for analysis)
Can save commands to standalone scripts for repeated execution
Original compilation command
Enhanced compilation command with instrumentation
Optional: Saved script files for reuse
--save: Creates {file}_compile_command.sh (original command)--save-enhanced: Creates compile_single_file_{file}.sh (enhanced with monitoring)
parse_ii.py Analyzes .ii preprocessed files to extract and display header file dependencies.
python3 ./.claude/skills/compile-analysis/scripts/parse_ii.py <ii-file>
Parses .ii files (preprocessed C++ source)
Extracts #include directives targeting foundation/arkui/
Builds dependency tree structure
Displays tree with Unicode box-drawing characters
头文件的依赖关系树：
└── foundation/arkui/ace_engine/frameworks/core/components_ng/base/frame_node.h
└── foundation/arkui/ace_engine/frameworks/core/components_ng/base/ui_node.h
├── foundation/arkui/ace_engine/frameworks/core/pipeline/base/element.h
└── ...
Understanding the Results
Compilation Time Format: MM:SS.mm (minutes:seconds.milliseconds)
Fast : < 5 seconds (typical for small files)Moderate : 5-15 secondsSlow : > 15 seconds (may indicate optimization opportunities)
Peak Memory Reported in kilobytes (KB)
Typical : 100,000 - 500,000 KB (100-500 MB)High : > 500,000 KB - may indicate excessive template instantiation or header dependencies
Dependency Tree The tree shows hierarchical include relationships:
Each level represents an #include directive
Multiple children indicate multiple includes in a file
Deep trees suggest heavy dependency chains
Wide trees (many direct includes) - Consider header consolidationDeep trees (long chains) - Look for circular dependencies or excessive forwardingDuplicate paths - Header guards missing or include order issues
Common Use Cases
Analyzing Header File Dependencies When you need to analyze the header file dependency structure of a source file:
Important : This workflow ONLY uses .ii files generated by compilation scripts. No other dependency analysis methods are used.
Check if .ii file exists in out/{product}/obj/ directory
If .ii exists → Parse it directly with parse_ii.py
If .ii doesn't exist → Generate it using compilation script, then parse
Always save the dependency tree to out/{product}/{file_name}_dependency_tree.txt
python3 ./.claude/skills/compile-analysis/scripts/parse_ii.py \
out/rk3568/obj/.../frame_node.ii \
--output out/rk3568/frame_node_dependency_tree.txt
If .ii file doesn't exist :
cd out/rk3568
bash compile_single_file_text_theme.sh
python3 ../../.claude/skills/compile-analysis/scripts/parse_ii.py \
obj/.../text_theme.ii \
--output text_theme_dependency_tree.txt
If neither .ii nor script exists :
python3 ./.claude/skills/compile-analysis/scripts/get_compile_command.py \
frameworks/core/components_ng/pattern/button_pattern.cpp \
<openharmony_root>/out/rk3568 --save-enhanced
cd out/rk3568
bash compile_single_file_button_pattern.sh
python3 ../../.claude/skills/compile-analysis/scripts/parse_ii.py \
obj/.../button_pattern.ii \
--output button_pattern_dependency_tree.txt
"分析这个文件的头文件依赖"
"头文件依赖关系"
"这个文件依赖了多少头文件"
"analyze header dependencies"
"header dependency tree"
"how many header files"
Format: {file_name}_dependency_tree.txt
Location: out/{product}/
Example: out/rk3568/frame_node_dependency_tree.txt
✅ MUST parse .ii files using parse_ii.py
✅ MUST use compilation scripts to generate .ii if needed
✅ MUST save dependency tree to out/{product}/{file_name}_dependency_tree.txt
❌ DO NOT use other dependency analysis tools (like clang -E, gcc -M, etc.)
❌ DO NOT attempt manual dependency parsing
Standalone Compilation of Individual Files When you need to compile a single file in isolation (for testing, debugging, or verification):
Important : This workflow ONLY uses pre-generated compilation scripts. No other compilation methods are used.
Check if compilation script exists: out/{product}/compile_single_file_{name}.sh
If script exists → Execute it directly
If script doesn't exist → Generate it first, then execute
cd out/rk3568
bash compile_single_file_frame_node.sh
python3 ./.claude/skills/compile-analysis/scripts/get_compile_command.py \
frameworks/core/components/text/text_theme.cpp <openharmony_root>/out/rk3568 --save-enhanced
cd out/rk3568
bash compile_single_file_text_theme.sh
"单独编译这个文件"
"编译单个文件"
"单编文件"
"独立编译文件"
"compile single file"
"compile individual file"
"standalone compile"
✅ MUST use existing compile_single_file_{name}.sh scripts
✅ MUST generate script if it doesn't exist before compilation
❌ DO NOT use ninja, make, or other build tools directly
❌ DO NOT attempt manual compilation commands
Extracting and Saving Compilation Commands When you need to extract or save compilation commands for later use:
Save standalone script with performance monitoring :
./.claude/skills/compile-analysis/scripts/analyze_compile.sh \
frameworks/core/components_ng/base/frame_node.cpp rk3568 --save-script
Extract command only without execution :
python3 ./.claude/skills/compile-analysis/scripts/get_compile_command.py \
frameworks/core/components_ng/base/frame_node.cpp \
<openharmony_root>/out/rk3568 --save-enhanced
Creating reusable compilation scripts
Setting up performance benchmarking
Generating reproducible build environments
Isolating specific file compilation for testing
Investigating Slow Builds When incremental builds are slower than expected:
Identify slow-compiling files by reviewing build log timestamps
Run analysis on slow files: ./analyze_compile.sh <slow-file>
Check dependency tree depth and breadth
Look for frequently included heavy headers
Optimizing Header Dependencies To reduce unnecessary recompilation:
Analyze dependency tree for common patterns
Identify headers included by many files
Consider forward declarations instead of full includes
Use precompiled headers (PCH) for stable dependencies
Before/After Comparisons Measure optimization impact using saved scripts:
Generate baseline script :
./analyze_compile.sh <file> rk3568 --save-script
cd out/rk3568
Run baseline measurement :
bash compile_single_file_{name}.sh
Apply optimizations (reduce includes, forward declarations, etc.)
Run comparison measurement :
bash compile_single_file_{name}.sh
Compare results to quantify improvements
The saved script ensures identical compilation conditions for fair comparison.
Troubleshooting
Issue: "找不到编译规则" (Compilation rule not found) Cause : Source file path doesn't match build database
Solutions :
Ensure the file is in the ace_engine directory structure
Check if the file has been built before (run full build first)
Verify path format: use relative path from ace_engine root
Issue: "找不到 .ii 文件" (.ii file not found) Cause : Compilation with -save-temps failed or file not created
Solutions :
Check if enhanced compilation command succeeded
Verify compiler supports -save-temps=obj flag
Manually search obj directory: find out/<product>/obj -name "*.ii"
Issue: Dependency tree shows few files Cause : parse_ii.py filters for foundation/arkui/ prefix only
Solutions :
This is expected behavior - focuses on arkui-specific headers
System headers are intentionally excluded
Modify target_prefix in parse_ii.py to include other paths
Best Practices
Start with full build : Ensure project has been built at least onceUse relative paths : Provide paths relative to ace_engine rootProduct-specific analysis : Specify product name if not using default rk3568Compare benchmarks : Track changes over time with saved resultsFocus on hot paths : Prioritize analysis on frequently modified files
Additional Resources
Reference Files For detailed workflows and advanced usage:
references/workflow.mdreferences/optimization.md
Example Files Working examples in examples/:
examples/example-analysis.shexamples/example-output.txt
Integration with Build System This skill integrates with the OpenHarmony GN/Ninja build system:
Reads build metadata from out/<product>/ directory
Parses toolchain.ninja for compiler rules
Extracts file-specific compilation commands from ninja files
Generates instrumentation-compatible commands for analysis
The enhanced compilation command modifies the original command by:
Removing ccache (to get accurate timing)
Adding -save-temps=obj (to generate .ii files)
Wrapping with /usr/bin/time (to measure resources)
Suppressing related warnings (-Wno-undefined-bool-conversion)
This ensures accurate measurements while maintaining compilation compatibility.
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