Merge pull request #10 from cozis/claude/measure-branch-coverage-0168rdcTg6viLER3ufRwoAye

Measure branch coverage of the simulation testing

.gitattributes

@@ -0,0 +1,2 @@
+# Ensure shell scripts always use LF line endings
+*.sh text eol=lf

.gitignore

@@ -3,3 +3,8 @@
 *.o
 *.a
 chunk_server_data_*
+# Coverage reports
+coverage_report/
+*.gcov
+*.gcda
+*.gcno

Makefile

@@ -1,5 +1,7 @@
 
 CFLAGS = -Wall -Wextra -ggdb
+COVERAGE_CFLAGS = $(CFLAGS) --coverage
+COVERAGE_LFLAGS = --coverage
 
 ifeq ($(OS),Windows_NT)
 	LFLAGS = -lws2_32
@@ -13,16 +15,27 @@ CFILES = $(shell find src -name '*.c')
 HFILES = $(shell find src -name '*.h')
 OFILES = $(CFILES:.c=.o)
 
-.PHONY: all clean
+.PHONY: all clean coverage coverage-report coverage-html
 
 all: mousefs$(EXT) mousefs_random_test$(EXT) example_client$(EXT) libmousefs.a
 
+coverage: mousefs_random_test_coverage$(EXT)
+
+coverage-report:
+	@./scripts/measure_coverage.sh 5
+
+coverage-html:
+	@./scripts/measure_coverage.sh 5 --html
+
 mousefs$(EXT): $(CFILES) $(HFILES)
 	gcc -o $@ $(CFILES) $(CFLAGS) $(LFLAGS) -Iinc -DBUILD_SERVER
 
 mousefs_random_test$(EXT): $(CFILES) $(HFILES)
 	gcc -o $@ $(CFILES) $(CFLAGS) $(LFLAGS) -Iinc -DBUILD_TEST
 
+mousefs_random_test_coverage$(EXT): $(CFILES) $(HFILES)
+	gcc -o $@ $(CFILES) $(COVERAGE_CFLAGS) $(LFLAGS) $(COVERAGE_LFLAGS) -Iinc -DBUILD_TEST
+
 example_client$(EXT): libmousefs.a
 	gcc -o $@ examples/main.c $(CFLAGS) -lmousefs $(LFLAGS) -Iinc -L.
 
@@ -38,7 +51,13 @@ clean:
 		mousefs.out                      \
 		mousefs_random_test.exe          \
 		mousefs_random_test.out          \
+		mousefs_random_test_coverage.exe \
+		mousefs_random_test_coverage.out \
 		example_client.exe               \
 		example_client.out               \
 		libmousefs.a                     \
-		src/*.o
+		src/*.o                          \
+		src/*.gcda                       \
+		src/*.gcno                       \
+		*.gcda                           \
+		*.gcno

scripts/README.md

@@ -0,0 +1,48 @@
+# Branch Coverage Measurement
+
+This directory contains scripts for measuring branch coverage of the random simulation.
+
+## Prerequisites
+
+The HTML report generation requires `lcov`:
+
+```bash
+sudo apt-get install lcov
+```
+
+## Usage
+
+### Quick text summary (5 second simulation)
+```bash
+make coverage-report
+```
+
+### HTML report with branch details (5 second simulation)
+```bash
+make coverage-html
+```
+
+### Custom duration
+```bash
+./scripts/measure_coverage.sh 10          # 10 second run, text output
+./scripts/measure_coverage.sh 10 --html   # 10 second run, HTML output
+```
+
+## What gets measured
+
+The coverage tool:
+- Builds the test binary with coverage instrumentation (`--coverage` flag)
+- Runs the random simulation for the specified duration
+- Generates reports showing which branches were executed
+
+## Output
+
+**Text report**: Shows per-file and total branch coverage percentages
+
+**HTML report**: Interactive report generated by lcov/genhtml showing:
+- Overall coverage summary
+- Per-file coverage breakdown
+- Source code with execution counts
+- Branch coverage details
+
+The HTML report is generated in `coverage_report/index.html`

scripts/fix_line_endings.sh

@@ -0,0 +1,18 @@
+#!/bin/bash
+# Fix line endings for coverage scripts
+
+echo "Fixing line endings for coverage scripts..."
+
+# Convert CRLF to LF
+dos2unix scripts/measure_coverage.sh 2>/dev/null || sed -i 's/\r$//' scripts/measure_coverage.sh
+dos2unix scripts/generate_coverage_html.sh 2>/dev/null || sed -i 's/\r$//' scripts/generate_coverage_html.sh
+
+# Ensure execute permissions
+chmod +x scripts/measure_coverage.sh
+chmod +x scripts/generate_coverage_html.sh
+
+echo "Done! Line endings fixed and execute permissions set."
+echo ""
+echo "You can now run:"
+echo "  make coverage-report"
+echo "  make coverage-html"

scripts/generate_coverage_html.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+# Generate HTML coverage report using lcov
+
+set -e
+
+OUTPUT_DIR="coverage_report"
+
+# Check if lcov is installed
+if ! command -v lcov &> /dev/null; then
+    echo "Error: lcov is not installed"
+    echo "Please install it with: sudo apt-get install lcov"
+    exit 1
+fi
+
+# Capture coverage data with branch coverage enabled
+echo "Capturing coverage data..."
+lcov --capture --directory . --output-file coverage.info --rc lcov_branch_coverage=1
+
+# Filter out system headers if any exist
+echo "Filtering coverage data..."
+lcov --remove coverage.info '/usr/*' --output-file coverage.info --ignore-errors unused --rc lcov_branch_coverage=1 || cp coverage.info coverage.info.bak
+
+# Generate HTML report
+echo "Generating HTML report..."
+genhtml coverage.info --output-directory "$OUTPUT_DIR" --branch-coverage --rc lcov_branch_coverage=1
+
+# Clean up
+rm -f coverage.info
+
+echo "HTML report generated in $OUTPUT_DIR/"
+echo "Open $OUTPUT_DIR/index.html in your browser"

scripts/measure_coverage.sh

@@ -0,0 +1,113 @@
+#!/bin/bash
+# Script to measure branch coverage of the random simulation
+
+set -e
+
+# Colors for output
+GREEN='\033[0;32m'
+BLUE='\033[0;34m'
+YELLOW='\033[1;33m'
+NC='\033[0m' # No Color
+
+echo -e "${BLUE}========================================${NC}"
+echo -e "${BLUE}Branch Coverage Measurement Tool${NC}"
+echo -e "${BLUE}========================================${NC}"
+echo
+
+# Clean previous coverage data
+echo -e "${YELLOW}Cleaning previous coverage data...${NC}"
+rm -f src/*.gcda src/*.gcno *.gcda *.gcno
+make clean > /dev/null 2>&1
+
+# Build with coverage
+echo -e "${YELLOW}Building with coverage instrumentation...${NC}"
+make coverage
+
+# Run the simulation for a limited time
+echo -e "${YELLOW}Running simulation...${NC}"
+SIMULATION_TIME=${1:-5}  # Default to 5 seconds if not specified
+echo "Running for ${SIMULATION_TIME} seconds..."
+
+# Run simulation in background and kill it after specified time
+timeout ${SIMULATION_TIME}s ./mousefs_random_test_coverage.out || true
+
+# Generate coverage reports
+echo
+echo -e "${YELLOW}Generating coverage reports...${NC}"
+
+# Find all .gcda files and generate coverage reports
+GCDA_FILES=$(find . -name "*.gcda")
+
+TOTAL_BRANCHES=0
+TAKEN_BRANCHES=0
+
+# Generate gcov reports from the coverage data files
+for gcda_file in $GCDA_FILES; do
+    # Extract the source file name from the gcda filename
+    # Files are named like: mousefs_random_test_coverage.out-basic.gcda
+    basename=$(basename "$gcda_file" .gcda)
+    source_name=${basename#*-}  # Remove prefix up to and including '-'
+
+    # Run gcov to generate the .gcov file
+    gcov -b "$gcda_file" > /dev/null 2>&1 || true
+done
+
+# Parse gcov output to count branches
+echo
+echo -e "${BLUE}========================================${NC}"
+echo -e "${BLUE}Branch Coverage Summary${NC}"
+echo -e "${BLUE}========================================${NC}"
+echo
+
+# Process each .gcov file
+for gcov_file in *.c.gcov; do
+    if [ -f "$gcov_file" ]; then
+        # Extract branch statistics from the gcov file
+        branches=$(grep -c "^branch" "$gcov_file" 2>/dev/null)
+        if [ -z "$branches" ]; then branches=0; fi
+
+        if [ "$branches" -gt 0 ]; then
+            taken_count=$(grep "^branch" "$gcov_file" 2>/dev/null | grep -c "taken [1-9]" 2>/dev/null || echo "0")
+            # Clean up the value - remove any whitespace/newlines
+            taken_count=$(echo "$taken_count" | tr -d '[:space:]')
+            if [ -z "$taken_count" ] || [ "$taken_count" = "" ]; then taken_count=0; fi
+
+            TOTAL_BRANCHES=$((TOTAL_BRANCHES + branches))
+            TAKEN_BRANCHES=$((TAKEN_BRANCHES + taken_count))
+            percentage=$((taken_count * 100 / branches))
+            filename=$(echo "$gcov_file" | sed 's/.gcov$//')
+            printf "%-40s %5d / %5d branches (%3d%%)\n" "$filename" "$taken_count" "$branches" "$percentage"
+        fi
+    fi
+done
+
+echo
+echo -e "${BLUE}========================================${NC}"
+if [ "$TOTAL_BRANCHES" -gt 0 ]; then
+    COVERAGE_PERCENT=$((TAKEN_BRANCHES * 100 / TOTAL_BRANCHES))
+    echo -e "${GREEN}Total: $TAKEN_BRANCHES / $TOTAL_BRANCHES branches reached (${COVERAGE_PERCENT}%)${NC}"
+else
+    echo -e "${YELLOW}No branch coverage data found${NC}"
+fi
+echo -e "${BLUE}========================================${NC}"
+echo
+
+# Generate HTML report if requested
+if [ "$2" == "--html" ]; then
+    echo -e "${YELLOW}Generating HTML coverage report...${NC}"
+    # Get the directory where this script is located
+    SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+    "$SCRIPT_DIR/generate_coverage_html.sh"
+    echo -e "${GREEN}HTML report generated in coverage_report/index.html${NC}"
+    echo "Open with: firefox coverage_report/index.html (or your preferred browser)"
+    echo
+fi
+
+# Clean up gcov files unless HTML was requested
+if [ "$2" != "--html" ] && [ "$2" != "--detailed" ]; then
+    echo -e "${YELLOW}Cleaning up coverage files...${NC}"
+    rm -f *.gcov
+fi
+
+echo
+echo -e "${GREEN}Coverage measurement complete!${NC}"

src/main_test.c

@@ -8,12 +8,20 @@
 
 static sig_atomic_t simulation_should_stop = false;
 
+static void signal_handler(int signum)
+{
+    (void)signum;
+    simulation_should_stop = true;
+}
+
 int main(int argc, char **argv)
 {
     (void)argc;
     (void)argv;
 
-    // TODO: set simulation_should_stop=true on ctrl+C
+    // Set up signal handlers for clean shutdown
+    signal(SIGINT, signal_handler);
+    signal(SIGTERM, signal_handler);
 
     startup_simulation(2);