Always initialise symbol_id for ASCII symbols

Commit 30662b5d64ff633f57d89290da2a85507d561187 dropped the default
initialisation of the symbol_id for ASCII characters. This leads to
problems when trying to access the symbol_id when the symbol was not
instantiated via AsciiSymbolKey (e.g. via SubStringAsciiSymbolKey).

Additionally, AsciiSymbolKey does not guarantee the presence of a
symbol_id in case the SMI value space has been exhausted.

Change-Id: I778bc5cc3cee80038a4ca6606bfcf4423d569132
Reviewed-by: Peter Varga <pvarga@inf.u-szeged.hu>

4 files changed, 56 insertions, 0 deletions

diff --git a/src/3rdparty/v8/src/heap-inl.h b/src/3rdparty/v8/src/heap-inl.h
index d1f66a8..aa933b6 100644
--- a/src/3rdparty/v8/src/heap-inl.h
+++ b/src/3rdparty/v8/src/heap-inl.h
@@ -127,6 +127,7 @@ MaybeObject* Heap::AllocateAsciiSymbol(Vector<const char> str,
   String* answer = String::cast(result);
   answer->set_length(str.length());
   answer->set_hash_field(hash_field);
+  SeqString::cast(answer)->set_symbol_id(0);
 
   ASSERT_EQ(size, answer->Size());
 
diff --git a/tests/auto/v8/tst_v8.cpp b/tests/auto/v8/tst_v8.cpp
index 3983f52..b8ad5d5 100644
--- a/tests/auto/v8/tst_v8.cpp
+++ b/tests/auto/v8/tst_v8.cpp
@@ -66,6 +66,7 @@ private slots:
     void fallbackpropertyhandler_callbacks();
     void fallbackpropertyhandler_in_prototype();
     void fallbackpropertyhandler_nonempty();
+    void completehash();
 };
 
 void tst_v8::eval()
@@ -128,6 +129,11 @@ void tst_v8::fallbackpropertyhandler_nonempty()
     QVERIFY(v8test_fallbackpropertyhandler_nonempty());
 }
 
+void tst_v8::completehash()
+{
+    QVERIFY(v8test_completehash());
+}
+
 int main(int argc, char *argv[])
 {
     V8::SetFlagsFromCommandLine(&argc, argv, true);
diff --git a/tests/auto/v8/v8test.cpp b/tests/auto/v8/v8test.cpp
index 9d59d89..09410a6 100644
--- a/tests/auto/v8/v8test.cpp
+++ b/tests/auto/v8/v8test.cpp
@@ -1041,3 +1041,51 @@ cleanup:
 
     ENDTEST();
 }
+
+bool v8test_completehash()
+{
+#define HASH_EQUALS(str1, str2) \
+{ \
+    String::CompleteHashData hash1 = str1->CompleteHash(); \
+    String::CompleteHashData hash2 = str2->CompleteHash(); \
+    VERIFY(hash1.length == hash2.length); \
+    VERIFY(hash1.symbol_id == hash2.symbol_id || (hash1.symbol_id == 0 || hash2.symbol_id == 0)); \
+    VERIFY(hash1.hash == hash2.hash); \
+};
+
+    BEGINTEST();
+
+    HandleScope handle_scope;
+    Persistent<Context> context = Context::New();
+    Context::Scope context_scope(context);
+
+    Local<String> str;
+    Local<String> str2;
+    uint16_t input[] = { 'I', 'n', 'p', 'u', 't', 0 };
+
+    str = String::New("Input");
+    str2 = String::New("Input");
+    HASH_EQUALS(str, str2);
+
+    str = String::New(input);
+    str2 = String::New(input);
+    HASH_EQUALS(str, str2);
+
+    str = String::NewSymbol("input");
+    str2 = String::NewSymbol("input");
+    HASH_EQUALS(str, str2);
+
+    str = CompileRun("var input = \"{ \\\"abc\\\": \\\"value\\\" }\"; input")->ToString();
+    str2 = CompileRun("var input2 = \"{ \\\"abc\\\": \\\"value\\\" }\"; input2")->ToString();
+    HASH_EQUALS(str, str2);
+
+    // SubStringAsciiSymbolKey is created via the built-in JSON parser for
+    // property names.
+    str = CompileRun("JSON.parse(input)")->ToObject()->GetOwnPropertyNames()->Get(0)->ToString();
+    str2 = CompileRun("JSON.parse(input2)")->ToObject()->GetOwnPropertyNames()->Get(0)->ToString();
+    HASH_EQUALS(str, str2);
+cleanup:
+    context.Dispose();
+
+    ENDTEST();
+}
diff --git a/tests/auto/v8/v8test.h b/tests/auto/v8/v8test.h
index 0b9a32b..c195b67 100644
--- a/tests/auto/v8/v8test.h
+++ b/tests/auto/v8/v8test.h
@@ -60,6 +60,7 @@ bool v8test_qtbug_24871();
 bool v8test_fallbackpropertyhandler_callbacks();
 bool v8test_fallbackpropertyhandler_in_prototype();
 bool v8test_fallbackpropertyhandler_nonempty();
+bool v8test_completehash();
 
 #endif // V8TEST_H