1 files changed, 63 insertions, 0 deletions
diff --git a/src/third_party/wiredtiger/test/fuzz/fuzz_coverage.sh b/src/third_party/wiredtiger/test/fuzz/fuzz_coverage.sh
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+++ b/src/third_party/wiredtiger/test/fuzz/fuzz_coverage.sh
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+#!/bin/bash
+#
+# fuzz_coverage.sh - generate coverage information after running a fuzz test.
+#
+# This script assumes it is running in the directory that the fuzz test was executed in and requires
+# that WiredTiger was running with "-fprofile-instr-generate" and "-fcoverage-mapping".
+#
+# Usage
+# fuzz_coverage.sh <fuzz-test-binary>
+#
+# Environment variables
+# PROFDATA_BINARY --
+# 	The binary to use to merge the profiling data. (default: llvm-profdata)
+# COV_BINARY --
+# 	The binary to use to generate coverage information. (default: llvm-cov)
+#
+# Output
+# <fuzz-test-binary>_cov.txt --
+#	A coverage report in text format. It can be inspect with the "less" command and searched for
+#	functions of interest. The numbers on the left of each line of code indicate how many times
+#	they were hit in the fuzz test.
+# <fuzz-test-binary>_cov.html --
+#	A coverage report in html format. If a web browser is available, this might be a nicer way
+#	visualize the coverage.
+
+if test "$#" -lt "1"; then
+	echo "$0: must specify fuzz test to generate coverage for"
+	exit 1
+fi
+
+fuzz_test_bin="$1"
+
+if test -z "$PROFDATA_BINARY"; then
+	profdata_bin="llvm-profdata"
+	echo "$0: PROFDATA_BINARY is unset, defaulting to $profdata_bin"
+else
+	profdata_bin="$PROFDATA_BINARY"
+fi
+
+if test -z "$COV_BINARY"; then
+	cov_bin="llvm-cov"
+	echo "$0: COV_BINARY is unset, defaulting to $cov_bin"
+else
+	cov_bin="$COV_BINARY"
+fi
+
+# Remove anything from previous runs.
+rm *_cov.profdata *_cov.txt *_cov.html &> /dev/null
+
+fuzz_cov_name="${fuzz_test_bin}_cov"
+combined_profdata_name="${fuzz_cov_name}.profdata"
+
+# Check that there is coverage data.
+ls *.profraw &> /dev/null
+if test $? -ne "0"; then
+	echo "$0: could not find any .profraw files in the current directory"
+	echo "$0: ensure that -fprofile-instr-generate and -fcoverage-mapping are added to your CFLAGS and LINKFLAGS when configuring"
+	exit 1
+fi
+
+$profdata_bin merge -sparse *.profraw -o $combined_profdata_name || exit 1
+$cov_bin show $fuzz_test_bin -instr-profile=$combined_profdata_name > "${fuzz_cov_name}.txt"
+$cov_bin show $fuzz_test_bin -instr-profile=$combined_profdata_name -format=html > "${fuzz_cov_name}.html"