两个错位的名称分解为相同的功能签名 [英] Two mangled names demangling to the same function signature

问题描述

我有一个Spidermonkey库，它为函数JS_DefineProperty导出了以下错误的符号:

I have a spidermonkey library that exports the following mangled symbol fora function JS_DefineProperty:

_Z17JS_DefinePropertyP9JSContextP8JSObjectPKcN2JS5ValueEPFiS0_NS5_6HandleIS2_EENS7_I4jsidEENS5_13MutableHandleIS6_EEEPFiS0_S8_SA_iSC_Ej

当我尝试编译使用此功能的文件时，外部引用被编译为:

When I try to compile a file that uses this function, the external reference is compiled as:

_Z17JS_DefinePropertyP9JSContextP8JSObjectPKcN2JS5ValueEPFiS0_NS5_6HandleIS2_EENS7_IlEENS5_13MutableHandleIS6_EEEPFiS0_S8_S9_iSB_Ej

两者的名称末尾略有不同.我都经历了一个名称分解器，它们都具有相同的签名:

The end of the name is slightly different between the two. I ran both through a name demangler and they both come out to the same signature:

JS_DefineProperty(JSContext*, JSObject*, char const*, JS::Value, int (*)(JSContext*, JS::Handle, JS::Handle, JS::MutableHandle), int (*)(JSContext*, JS::Handle, JS::Handle, int, JS::MutableHandle), unsigned int)

所以我对其中的区别有些困惑.我相信这两个版本都是使用g++ 4.7编译的. 任何人都可以解码名称中的其他差异，以便我进一步调查吗?

So I'm a little stumped as to what the difference is. I believe both versions were compiled using g++ 4.7. Can anyone decode the extra difference in the name, so I can investigate further?

推荐答案

实际上两者之间是有区别的.

There is in fact a difference between the two.

_Z17JS_DefinePropertyP9JSContextP8JSObjectPKcN2JS5ValueEPFiS0_NS5_6HandleIS2_EENS7_I4jsidEENS5_13MutableHandleIS6_EEEPFiS0_S8_SA_iSC_Ej分解为:

JS_DefineProperty(JSContext*, JSObject*, char const*, JS::Value, int (*)(JSContext*, JS::Handle<JSObject*>, JS::Handle<jsid>, JS::MutableHandle<JS::Value>), int (*)(JSContext*, JS::Handle<JSObject*>, JS::Handle<jsid>, int, JS::MutableHandle<JS::Value>), unsigned int)

_Z17JS_DefinePropertyP9JSContextP8JSObjectPKcN2JS5ValueEPFiS0_NS5_6HandleIS2_EENS7_IlEENS5_13MutableHandleIS6_EEEPFiS0_S8_S9_iSB_Ej分解为:

JS_DefineProperty(JSContext*, JSObject*, char const*, JS::Value, int (*)(JSContext*, JS::Handle<JSObject*>, JS::Handle<long>, JS::MutableHandle<JS::Value>), int (*)(JSContext*, JS::Handle<JSObject*>, JS::Handle<long>, int, JS::MutableHandle<JS::Value>), unsigned int)

前者使用JS::Handle<jsid>的情况下，后者使用JS::Handle<long>.

Where the former is using JS::Handle<jsid>, the latter is using JS::Handle<long>.

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