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-rw-r--r--fpdfsdk/src/javascript/global.cpp74
1 files changed, 66 insertions, 8 deletions
diff --git a/fpdfsdk/src/javascript/global.cpp b/fpdfsdk/src/javascript/global.cpp
index 04f9ef9da3..88b3fe77ce 100644
--- a/fpdfsdk/src/javascript/global.cpp
+++ b/fpdfsdk/src/javascript/global.cpp
@@ -16,14 +16,72 @@
/* ---------------------------- global ---------------------------- */
-extern const unsigned int JSCONST_nStringHash = JS_CalcHash(VALUE_NAME_STRING,wcslen(VALUE_NAME_STRING));
-extern const unsigned int JSCONST_nNumberHash = JS_CalcHash(VALUE_NAME_NUMBER,wcslen(VALUE_NAME_NUMBER));
-extern const unsigned int JSCONST_nBoolHash = JS_CalcHash(VALUE_NAME_BOOLEAN,wcslen(VALUE_NAME_BOOLEAN));
-extern const unsigned int JSCONST_nDateHash = JS_CalcHash(VALUE_NAME_DATE,wcslen(VALUE_NAME_DATE));
-extern const unsigned int JSCONST_nObjectHash = JS_CalcHash(VALUE_NAME_OBJECT,wcslen(VALUE_NAME_OBJECT));
-extern const unsigned int JSCONST_nFXobjHash = JS_CalcHash(VALUE_NAME_FXOBJ,wcslen(VALUE_NAME_FXOBJ));
-extern const unsigned int JSCONST_nNullHash = JS_CalcHash(VALUE_NAME_NULL,wcslen(VALUE_NAME_NULL));
-extern const unsigned int JSCONST_nUndefHash = JS_CalcHash(VALUE_NAME_UNDEFINED,wcslen(VALUE_NAME_UNDEFINED));
+// Helper class for compile-time calculation of hash values in order to
+// avoid having global object initializers.
+template <unsigned ACC, wchar_t... Ns>
+struct CHash;
+
+// Only needed to hash single-character strings.
+template <wchar_t N>
+struct CHash<N> {
+ static const unsigned value = N;
+};
+
+template <unsigned ACC, wchar_t N>
+struct CHash<ACC, N> {
+ static const unsigned value = (ACC * 1313LLU + N) & 0xFFFFFFFF;
+};
+
+template <unsigned ACC, wchar_t N, wchar_t... Ns>
+struct CHash<ACC, N, Ns...> {
+ static const unsigned value = CHash<CHash<ACC, N>::value, Ns...>::value;
+};
+
+extern const unsigned int JSCONST_nStringHash =
+ CHash<'s','t','r','i','n','g'>::value;
+extern const unsigned int JSCONST_nNumberHash =
+ CHash<'n','u','m','b','e','r'>::value;
+extern const unsigned int JSCONST_nBoolHash =
+ CHash<'b','o','o','l','e','a','n'>::value;
+extern const unsigned int JSCONST_nDateHash =
+ CHash<'d','a','t','e'>::value;
+extern const unsigned int JSCONST_nObjectHash =
+ CHash<'o','b','j','e','c','t'>::value;
+extern const unsigned int JSCONST_nFXobjHash =
+ CHash<'f','x','o','b','j'>::value;
+extern const unsigned int JSCONST_nNullHash =
+ CHash<'n','u','l','l'>::value;
+extern const unsigned int JSCONST_nUndefHash =
+ CHash<'u','n','d','e','f','i','n','e','d'>::value;
+
+#ifdef _DEBUG
+class HashVerify
+{
+public:
+ HashVerify();
+} g_hashVerify;
+
+HashVerify::HashVerify()
+{
+ ASSERT(JSCONST_nStringHash ==
+ JS_CalcHash(VALUE_NAME_STRING,wcslen(VALUE_NAME_STRING)));
+ ASSERT(JSCONST_nNumberHash ==
+ JS_CalcHash(VALUE_NAME_NUMBER,wcslen(VALUE_NAME_NUMBER)));
+ ASSERT(JSCONST_nBoolHash ==
+ JS_CalcHash(VALUE_NAME_BOOLEAN,wcslen(VALUE_NAME_BOOLEAN)));
+ ASSERT(JSCONST_nDateHash ==
+ JS_CalcHash(VALUE_NAME_DATE,wcslen(VALUE_NAME_DATE)));
+ ASSERT(JSCONST_nObjectHash ==
+ JS_CalcHash(VALUE_NAME_OBJECT,wcslen(VALUE_NAME_OBJECT)));
+ ASSERT(JSCONST_nFXobjHash ==
+ JS_CalcHash(VALUE_NAME_FXOBJ,wcslen(VALUE_NAME_FXOBJ)));
+ ASSERT(JSCONST_nNullHash ==
+ JS_CalcHash(VALUE_NAME_NULL,wcslen(VALUE_NAME_NULL)));
+ ASSERT(JSCONST_nUndefHash ==
+ JS_CalcHash(VALUE_NAME_UNDEFINED,wcslen(VALUE_NAME_UNDEFINED)));
+}
+#endif
+
BEGIN_JS_STATIC_CONST(CJS_Global)
END_JS_STATIC_CONST()