add memory growth test case

.gitignore

@@ -1,7 +1,9 @@
-*/tests/**
-!*/tests/**/*.*
-
-*/tests_imported/**
-!*/tests_imported/**/*.*
+## ignore all files wo extension D20190125T022032
+*
+!/**/
+!*.*
 
 htmldocs
+
+*.dylib
+!Makefile

testcases/tests/t0126/Makefile

@@ -0,0 +1,15 @@
+# NIMBASE = ~/lib/Nim/lib/nimbase.h
+NIMBASE = $nimc_D/lib/nimbase.h
+
+.PHONY: run
+
+run: a.out
+	./a.out
+
+a.out: test.cpp csrc/clib.cpp csrc/nimbase.h
+	g++ -Icsrc test.cpp
+
+csrc/clib.cpp: clib.nim
+	nim cpp --checks:on -d:traceGC --memTracker:on -d:memProfiler -d:lineDir -d:leakDetector -d:useSysAssert -d:useGcAssert --header --nimcache:csrc --compileOnly ./clib.nim
+
+csrc/nimbase.h: $(NIMBASE) csrc/clib.cpp

testcases/tests/t0126/build.sh

@@ -0,0 +1,12 @@
+build(){
+  (
+    set -e
+    temp_D=/tmp/D20190124T204416/
+    nim c  -o:$temp_D/libclib.dylib --app:lib --nimcache:$temp_D clib.nim
+    clang++ -o $temp_D/test test.cpp -lclib -L$temp_D/
+    $temp_D/test > $temp_D/log.txt
+    grep 'occupied memory' $temp_D/log.txt |less
+  )
+}
+
+build

testcases/tests/t0126/clib.nim

@@ -0,0 +1,19 @@
+import strformat
+import strutils
+import sequtils
+
+echo "clib initialized"
+echo GC_getStatistics()
+
+var s0 = "foobar"
+var s1 = s0.cstring
+proc hello_echo*(message:cstring):cstring {.exportc.} =
+  ## Echo a message back
+  echo GC_getStatistics()
+  when defined(case1):
+    var s_message = $message
+    result = &"{s_message} echo"
+    echo &"Nim echo result: {result}"
+  else:
+    result = s1
+

testcases/tests/t0126/readme.md

@@ -0,0 +1,13 @@
+## command
+running
+```
+sh build.sh
+```
+shows no memory growth
+
+## links
+* Nim memory growth
+* [node-nim-memory-bug/clib.nim at master · iffy/node-nim-memory-bug](https://github.com/iffy/node-nim-memory-bug/blob/master/clib.nim)
+* https://gist.github.com/iffy/c0e5e962bf3f14acf41dc6969f322747 (first version)
+* https://gist.github.com/iffy/7ad0755869240ebe295b1306179b7042 (2nd version)
+

testcases/tests/t0126/test.cpp

@@ -0,0 +1,31 @@
+#include <iostream>
+// #include "csrc/clib.h"
+using namespace std;
+
+// N_CDECL(void, NimMain)(void);
+
+extern "C"
+char* hello_echo(char* message);
+
+std::string echo(std::string arg) {
+    const char* message = arg.c_str();
+    cout << "C++ passing message: " << message << "\n";
+    cout << "C++ message addr: " << (void*)message << "\n";
+    char* retval = hello_echo(
+        (char *)(message)
+    );
+    cout << "C++ retval addr : " << (void*)retval << "\n";
+    return std::string(retval);
+}
+
+int main() {
+    // NimMain();
+    cout << "Hello world\n";
+    int i = 0;
+    for (i = 0; i < 1000; i++) {
+        std::string msg = std::string("Hello");
+        std::string ret = echo(msg);
+        cout << "Got reply: " << ret << "\n";
+    }
+    return 0;
+}