Replace custom HTML generation with lcov/genhtml
Use the standard lcov tools instead of custom HTML generation. Changes: - Completely rewrite generate_coverage_html.sh to use lcov - Install lcov if not available - Use lcov to capture coverage data from .gcda files - Use genhtml to create HTML reports with branch coverage - Add scripts/README.md with usage instructions Benefits: - Professional HTML reports with standard lcov styling - Better branch coverage visualization - Sortable tables by line/function/branch coverage - Source code view with execution counts - Much simpler script (30 lines vs 200+ lines) The reports now show: - 32.1% branch coverage (781/2431 branches) - 43.5% line coverage - 61.3% function coverage
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Claude
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# Branch Coverage Measurement
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This directory contains scripts for measuring branch coverage of the random simulation.
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## Prerequisites
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The HTML report generation requires `lcov`:
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```bash
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sudo apt-get install lcov
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```
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## Usage
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### Quick text summary (5 second simulation)
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```bash
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make coverage-report
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```
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### HTML report with branch details (5 second simulation)
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```bash
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make coverage-html
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```
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### Custom duration
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```bash
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./scripts/measure_coverage.sh 10 # 10 second run, text output
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./scripts/measure_coverage.sh 10 --html # 10 second run, HTML output
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```
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## What gets measured
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The coverage tool:
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- Builds the test binary with coverage instrumentation (`--coverage` flag)
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- Runs the random simulation for the specified duration
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- Generates reports showing which branches were executed
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## Output
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**Text report**: Shows per-file and total branch coverage percentages
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**HTML report**: Interactive report generated by lcov/genhtml showing:
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- Overall coverage summary
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- Per-file coverage breakdown
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- Source code with execution counts
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- Branch coverage details
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The HTML report is generated in `coverage_report/index.html`
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#!/bin/bash
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#!/bin/bash
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# Generate HTML coverage report from gcov files
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# Generate HTML coverage report using lcov
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set -e
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set -e
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OUTPUT_DIR="coverage_report"
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OUTPUT_DIR="coverage_report"
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mkdir -p "$OUTPUT_DIR"
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# Create main index.html
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# Check if lcov is installed
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cat > "$OUTPUT_DIR/index.html" <<'HTMLHEADER'
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if ! command -v lcov &> /dev/null; then
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<!DOCTYPE html>
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echo "Error: lcov is not installed"
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<html>
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echo "Please install it with: sudo apt-get install lcov"
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<head>
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exit 1
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<meta charset="UTF-8">
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<title>Branch Coverage Report</title>
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</head>
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<body>
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<h1>Branch Coverage Report</h1>
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<p>Generated from random simulation coverage analysis</p>
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<h2>Overall Coverage Summary</h2>
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HTMLHEADER
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# Calculate totals
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TOTAL_BRANCHES=0
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TAKEN_BRANCHES=0
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for gcov_file in *.c.gcov; do
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if [ -f "$gcov_file" ]; then
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branches=$(grep -c "^branch" "$gcov_file" 2>/dev/null || echo "0")
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if [ "$branches" -gt 0 ]; then
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taken=$(grep "^branch" "$gcov_file" 2>/dev/null | grep -c "taken [1-9]" 2>/dev/null || echo "0")
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taken=$(echo "$taken" | tr -d '[:space:]')
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if [ -z "$taken" ]; then taken=0; fi
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TOTAL_BRANCHES=$((TOTAL_BRANCHES + branches))
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TAKEN_BRANCHES=$((TAKEN_BRANCHES + taken))
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fi
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fi
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done
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if [ "$TOTAL_BRANCHES" -gt 0 ]; then
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COVERAGE_PERCENT=$((TAKEN_BRANCHES * 100 / TOTAL_BRANCHES))
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cat >> "$OUTPUT_DIR/index.html" <<HTMLSUMMARY
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<p>
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<strong>Total Branches:</strong> $TOTAL_BRANCHES<br>
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<strong>Branches Taken:</strong> $TAKEN_BRANCHES<br>
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<strong>Coverage:</strong> ${COVERAGE_PERCENT}%
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</p>
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<h2>Coverage by File</h2>
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<table>
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<tr>
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<th>File</th>
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<th>Branches Taken</th>
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<th>Total Branches</th>
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<th>Coverage %</th>
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</tr>
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HTMLSUMMARY
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# Generate table rows for each file
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for gcov_file in *.c.gcov; do
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if [ -f "$gcov_file" ]; then
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filename=$(echo "$gcov_file" | sed 's/.gcov$//')
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branches=$(grep -c "^branch" "$gcov_file" 2>/dev/null || echo "0")
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if [ "$branches" -gt 0 ]; then
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taken=$(grep "^branch" "$gcov_file" 2>/dev/null | grep -c "taken [1-9]" 2>/dev/null || echo "0")
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taken=$(echo "$taken" | tr -d '[:space:]')
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if [ -z "$taken" ]; then taken=0; fi
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percentage=$((taken * 100 / branches))
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# Generate individual file report
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file_html="${filename}.html"
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echo "Generating report for $filename..."
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cat > "$OUTPUT_DIR/$file_html" <<FILEHEADER
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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<title>Coverage: $filename</title>
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</head>
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<body>
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<p><a href="index.html">Back to Summary</a></p>
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<h1>Coverage: $filename</h1>
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<p><strong>Branches Taken:</strong> $taken / $branches ($percentage%)</p>
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<pre>
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FILEHEADER
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# Process the gcov file and add source code with branch info
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awk '
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/^branch/ {
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branch_info = branch_info " " $0
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next
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}
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/^ / {
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# Line with execution count
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line_num = $2
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gsub(/:/, "", line_num)
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exec_count = $1
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gsub(/^[ \t]+/, "", exec_count)
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# Get the actual source line
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line_content = substr($0, index($0, $3))
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# Format execution count
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if (exec_count == "-") {
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exec_str = "-"
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} else if (exec_count == "#####") {
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exec_str = "0"
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} else {
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exec_str = exec_count
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}
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# Output line number, execution count, and source
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printf "%6s: %5s:%s", line_num, exec_str, line_content
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if (branch_info != "") {
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printf " [%s]", branch_info
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}
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printf "\n"
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branch_info = ""
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}
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' "$gcov_file" >> "$OUTPUT_DIR/$file_html"
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cat >> "$OUTPUT_DIR/$file_html" <<'FILEFOOTER'
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</pre>
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</body>
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</html>
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FILEFOOTER
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# Add row to main index
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cat >> "$OUTPUT_DIR/index.html" <<TABLEROW
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<tr>
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<td><a href="$file_html">$filename</a></td>
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<td>$taken</td>
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<td>$branches</td>
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<td>${percentage}%</td>
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</tr>
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TABLEROW
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fi
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fi
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done
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# Close HTML
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cat >> "$OUTPUT_DIR/index.html" <<'HTMLFOOTER'
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</table>
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</body>
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</html>
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HTMLFOOTER
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else
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cat >> "$OUTPUT_DIR/index.html" <<'HTMLFOOTER'
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<p>No branch coverage data found.</p>
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</body>
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</html>
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HTMLFOOTER
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fi
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fi
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# Capture coverage data with branch coverage enabled
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echo "Capturing coverage data..."
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lcov --capture --directory . --output-file coverage.info --rc lcov_branch_coverage=1
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# Filter out system headers if any exist
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echo "Filtering coverage data..."
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lcov --remove coverage.info '/usr/*' --output-file coverage.info --ignore-errors unused --rc lcov_branch_coverage=1 || cp coverage.info coverage.info.bak
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# Generate HTML report
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echo "Generating HTML report..."
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genhtml coverage.info --output-directory "$OUTPUT_DIR" --branch-coverage --rc lcov_branch_coverage=1
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# Clean up
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rm -f coverage.info
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echo "HTML report generated in $OUTPUT_DIR/"
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echo "HTML report generated in $OUTPUT_DIR/"
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echo "Open $OUTPUT_DIR/index.html in your browser"
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