Add heap-profiling script

script/heap-profile

@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+#
+# Usage:
+#   script/heap-profile
+#
+# Parse an example source file and record memory usage
+#
+# Dependencies:
+#   * `pprof` executable:   https://github.com/google/pprof
+#   * `gperftools` package: https://github.com/gperftools/gperftools
+
+set -e
+
+GRAMMARS_DIR=$PWD/test/fixtures/grammars
+
+# Build the library
+make
+
+# Build the heap-profiling harness
+clang++                               \
+  -I lib/include                      \
+  -I $GRAMMARS_DIR                    \
+  -D GRAMMARS_DIR=\"${GRAMMARS_DIR}/\" \
+  -l tcmalloc                         \
+  ./libtree-sitter.a                  \
+  test/profile/heap.cc                \
+  -o target/heap-profile
+
+# Run the harness with heap profiling enabled.
+export HEAPPROFILE=$PWD/profile
+target/heap-profile $@
+
+# Extract statistics using pprof.
+pprof -top -cum profile.0001.heap