黑客攻击
我已经想到，由于头文件中的条件定义以及分散的库和头文件位置，链接失败。好吧...我尝试在命令行上定义 JS_HAS_CTYPES，但如果它确实有效，那肯定是不够的。
我决定，因为 SpiderMonkey shell 有自己独特的 makefile，并且已经可以访问我试图捕获的功能，只需将 js.cpp 重命名为 js.cpp.tmp 并允许我的代码站在它的位置，几乎成功了。
文件编译良好，应用程序执行时没有抛出运行时链接错误，但代码（'JSNativeObject' ctypes）几乎完全失败了 JS_InitCTypesClass。看到我的链接错误早就被遗忘了，我立即查看了 make 的输出，看看我是否可以“刷”编译代码......我们有一个宾果游戏！
汇编
在将 shell/js.cpp 恢复到其原始目标后，我将 hello.cpp 移动到 spidermonkey 的根源目录并开始更正由 makefile 创建的相对路径以及执行删除构造显然与我的申请无关。
虽然以下命令似乎呈现了一个可操作的二进制文件，但作者无法确定此列表的正确性或完整性。
c++ -o hello.o -c -Idist/system_wrappers_js -include config/gcc_hidden.h \
-DEXPORT_JS_API -DOSTYPE=\"Linux3.2\" -DOSARCH=Linux -I. -Idist/include \
-Idist/include/nsprpub -I/usr/include/nspr -fPIC -fno-rtti \
-fno-exceptions -Wall -Wpointer-arith -Woverloaded-virtual -Wsynth \
-Wno-ctor-dtor-privacy -Wno-non-virtual-dtor -Wcast-align \
-Wno-invalid-offsetof -Wno-variadic-macros -Werror=return-type -pedantic \
-Wno-long-long -fno-strict-aliasing -pthread -pipe -DNDEBUG -DTRIMMED -Os \
-freorder-blocks -fomit-frame-pointer -DJS_HAS_CTYPES -DMOZILLA_CLIENT \
-include js-confdefs.h -MD -MF .deps/hello.pp hello.cpp;
c++ -o hello -fno-rtti -fno-exceptions -Wall -Wpointer-arith \
-Woverloaded-virtual -Wsynth -Wno-ctor-dtor-privacy \
-Wno-non-virtual-dtor -Wcast-align -Wno-invalid-offsetof \
-Wno-variadic-macros -Werror=return-type -pedantic \
-Wno-long-long -fno-strict-aliasing -pthread -pipe -DNDEBUG \
-DTRIMMED -Os -freorder-blocks -fomit-frame-pointer hello.o \
-lpthread -Wl,-rpath-link,/bin -Wl,-rpath-link,/usr/local/lib \
-Ldist/bin -Ldist/lib -L/usr/lib -lplds4 -lplc4 -lnspr4 \
-lpthread -ldl editline/libeditline.a libjs_static.a -ldl;
上面列出的两个命令被放入一个名为“mkhello”的可执行 shell 脚本中，该脚本保存在根源目录中。
据我所知，这是一种两阶段编译方法。出于什么原因我不确定，但解释似乎很有教育意义。想法？
编辑请参阅下面的评论以了解“两阶段编译方法”的说明。
代码：hello.cpp
/*
* This define is for Windows only, it is a work-around for bug 661663.
*/
#ifdef _MSC_VER
# define XP_WIN
#endif
/* Include the JSAPI header file to get access to SpiderMonkey. */
#include "jsapi.h"
/* The class of the global object. */
static JSClass global_class = {
"global", JSCLASS_GLOBAL_FLAGS,
JS_PropertyStub, JS_PropertyStub, JS_PropertyStub, JS_StrictPropertyStub,
JS_EnumerateStub, JS_ResolveStub, JS_ConvertStub, JS_FinalizeStub,
JSCLASS_NO_OPTIONAL_MEMBERS
};
/* The error reporter callback. */
void reportError(JSContext *cx, const char *message, JSErrorReport *report)
{
fprintf(stderr, "%s:%u:%s\n",
report->filename ? report->filename : "<no filename=\"filename\">",
(unsigned int) report->lineno,
message);
}
int main(int argc, const char *argv[])
{
/* JSAPI variables. */
JSRuntime *rt;
JSContext *cx;
JSObject *global;
/* Create a JS runtime. You always need at least one runtime per process. */
rt = JS_NewRuntime(8 * 1024 * 1024);
if (rt == NULL)
return 1;
/*
* Create a context. You always need a context per thread.
* Note that this program is not multi-threaded.
*/
cx = JS_NewContext(rt, 8192);
if (cx == NULL)
return 1;
JS_SetOptions(cx, JSOPTION_VAROBJFIX | JSOPTION_JIT | JSOPTION_METHODJIT);
JS_SetVersion(cx, JSVERSION_LATEST);
JS_SetErrorReporter(cx, reportError);
/*
* Create the global object in a new compartment.
* You always need a global object per context.
*/
global = JS_NewCompartmentAndGlobalObject(cx, &global_class, NULL);
if (global == NULL)
return 1;
/*
* Populate the global object with the standard JavaScript
* function and object classes, such as Object, Array, Date.
*/
if (!JS_InitStandardClasses(cx, global))
return 1;
/* Populate the global object with the ctypes object. */
if (!JS_InitCTypesClass(cx, global))
return NULL;
/*
/* Your application code here. This may include JSAPI calls
* to create your own custom JavaScript objects and to run scripts.
*
* The following example code creates a literal JavaScript script,
* evaluates it, and prints the result to stdout.
*
* Errors are conventionally saved in a JSBool variable named ok.
*/
char *script = "ctypes.open";
jsval rval;
JSString *str;
JSBool ok;
const char *filename = "noname";
uintN lineno = 0;
ok = JS_EvaluateScript(cx, global, script, strlen(script),
filename, lineno, &rval);
if (rval == NULL | rval == JS_FALSE)
return 1;
str = JS_ValueToString(cx, rval);
printf("%s\n", JS_EncodeString(cx, str));
/* End of your application code */
/* Clean things up and shut down SpiderMonkey. */
JS_DestroyContext(cx);
JS_DestroyRuntime(rt);
JS_ShutDown();
return 0;
}
结论
$ ./mkhello
# ...
# error free garbage scrolls....
$ ./hello
function open() {
[native code]
}
按照此示例为 SpiderMonkey 嵌入提供 js-ctypes。您可能需要也可能不需要按顺序重新创建这些步骤，但从我目前的角度来看，强烈建议您这样做。