Print values in a nicer way in the jsc shell

https://bugs.webkit.org/show_bug.cgi?id=230931

Reviewed by Tadeu Zagallo.

JSTests:

* ChakraCore/test/jsc-lib.js:

Source/JavaScriptCore:

Currently, print(1), print("1"), and print([1]) all print to stdout
simply as "1" (without the quotes). Same for values when running the
REPL. This isn't super helpful. Let's print quotes for strings, and
brackets for arrays.

Some tests rely on the old print behavior. Those tests now use the legacyPrint
instead.

* jsc.cpp:
(toCString):
(printInternal):
(JSC_DEFINE_HOST_FUNCTION):
(runInteractive):
(cStringFromViewWithString): Deleted.
* runtime/JSCJSValue.cpp:
(JSC::JSValue::toWTFStringForConsole const):
* runtime/JSCJSValue.h:

LayoutTests:

* resources/standalone-pre.js:


Canonical link: https://commits.webkit.org/242318@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@283293 268f45cc-cd09-0410-ab3c-d52691b4dbfc

JSTests/ChakraCore/test/jsc-lib.js

@@ -1,3 +1,5 @@
+print = legacyPrint;
+
 WScript = {
     _jscGC: gc,
     _jscLoad: load,

JSTests/ChangeLog

@@ -1,3 +1,12 @@
+2021-09-29  Saam Barati  <sbarati@apple.com>
+
+        Print values in a nicer way in the jsc shell
+        https://bugs.webkit.org/show_bug.cgi?id=230931
+
+        Reviewed by Tadeu Zagallo.
+
+        * ChakraCore/test/jsc-lib.js:
+
 2021-09-29  Saam Barati  <sbarati@apple.com>
 
         We need to load the baseline JIT's constant pool register after OSR exit to checkpoints if we return to baseline code

JSTests/exceptionFuzz/3d-cube.js

@@ -358,5 +358,5 @@ DisplArea = null;
 
 })();
 } catch (e) {
-    print("JSC EXCEPTION FUZZ: Caught exception: " + e);
+    legacyPrint("JSC EXCEPTION FUZZ: Caught exception: " + e);
 }

JSTests/exceptionFuzz/date-format-xparb.js

@@ -424,5 +424,5 @@ for (i = 0; i < 4000; ++i) {
 
 })();
 } catch (e) {
-    print("JSC EXCEPTION FUZZ: Caught exception: " + e);
+    legacyPrint("JSC EXCEPTION FUZZ: Caught exception: " + e);
 }

JSTests/exceptionFuzz/earley-boyer.js

@@ -4684,6 +4684,6 @@ for (var i = 0; i < 4; ++i) {
 }
 })();
 } catch (e) {
-    print("JSC EXCEPTION FUZZ: Caught exception: " + e);
+    legacyPrint("JSC EXCEPTION FUZZ: Caught exception: " + e);
 }
 

LayoutTests/ChangeLog

@@ -1,3 +1,12 @@
+2021-09-29  Saam Barati  <sbarati@apple.com>
+
+        Print values in a nicer way in the jsc shell
+        https://bugs.webkit.org/show_bug.cgi?id=230931
+
+        Reviewed by Tadeu Zagallo.
+
+        * resources/standalone-pre.js:
+
 2021-09-29  Chris Dumez  <cdumez@apple.com>
 
         [ iOS Debug ] http/tests/xmlhttprequest/access-control-preflight-credential-sync.html is a flaky crash

LayoutTests/resources/standalone-pre.js

@@ -13,6 +13,8 @@ silentTestPass = false;
 didPassSomeTestsSilently = false;
 didFailSomeTests = false;
 
+print = legacyPrint;
+
 function description(msg)
 {
     print(msg);

Source/JavaScriptCore/ChangeLog

@@ -1,3 +1,28 @@
+2021-09-29  Saam Barati  <sbarati@apple.com>
+
+        Print values in a nicer way in the jsc shell
+        https://bugs.webkit.org/show_bug.cgi?id=230931
+
+        Reviewed by Tadeu Zagallo.
+
+        Currently, print(1), print("1"), and print([1]) all print to stdout
+        simply as "1" (without the quotes). Same for values when running the
+        REPL. This isn't super helpful. Let's print quotes for strings, and
+        brackets for arrays.
+
+        Some tests rely on the old print behavior. Those tests now use the legacyPrint
+        instead.
+
+        * jsc.cpp:
+        (toCString):
+        (printInternal):
+        (JSC_DEFINE_HOST_FUNCTION):
+        (runInteractive):
+        (cStringFromViewWithString): Deleted.
+        * runtime/JSCJSValue.cpp:
+        (JSC::JSValue::toWTFStringForConsole const):
+        * runtime/JSCJSValue.h:
+
 2021-09-29  Saam Barati  <sbarati@apple.com>
 
         We need to load the baseline JIT's constant pool register after OSR exit to checkpoints if we return to baseline code

Source/JavaScriptCore/jsc.cpp

@@ -278,6 +278,7 @@ static JSC_DECLARE_HOST_FUNCTION(functionIsHeapBigInt);
 
 static JSC_DECLARE_HOST_FUNCTION(functionPrintStdOut);
 static JSC_DECLARE_HOST_FUNCTION(functionPrintStdErr);
+static JSC_DECLARE_HOST_FUNCTION(functionLegacyPrint);
 static JSC_DECLARE_HOST_FUNCTION(functionDebug);
 static JSC_DECLARE_HOST_FUNCTION(functionDescribe);
 static JSC_DECLARE_HOST_FUNCTION(functionDescribeArray);
@@ -527,6 +528,7 @@ class GlobalObject final : public JSGlobalObject {
         addFunction(vm, "describeArray", functionDescribeArray, 1);
         addFunction(vm, "print", functionPrintStdOut, 1);
         addFunction(vm, "printErr", functionPrintStdErr, 1);
+        addFunction(vm, "legacyPrint", functionLegacyPrint, 1);
         addFunction(vm, "quit", functionQuit, 0);
         addFunction(vm, "gc", functionGCAndSweep, 0);
         addFunction(vm, "fullGC", functionFullGC, 0);
@@ -1238,9 +1240,10 @@ JSObject* GlobalObject::moduleLoaderCreateImportMetaProperties(JSGlobalObject* g
     return metaProperties;
 }
 
-static CString cStringFromViewWithString(JSGlobalObject* globalObject, ThrowScope& scope, StringViewWithUnderlyingString& viewWithString)
+template <typename T>
+static CString toCString(JSGlobalObject* globalObject, ThrowScope& scope, T& string)
 {
-    Expected<CString, UTF8ConversionError> expectedString = viewWithString.view.tryGetUtf8();
+    Expected<CString, UTF8ConversionError> expectedString = string.tryGetUtf8();
     if (expectedString)
         return expectedString.value();
     switch (expectedString.error()) {
@@ -1259,7 +1262,7 @@ static CString cStringFromViewWithString(JSGlobalObject* globalObject, ThrowScop
     return { };
 }
 
-static EncodedJSValue printInternal(JSGlobalObject* globalObject, CallFrame* callFrame, FILE* out)
+static EncodedJSValue printInternal(JSGlobalObject* globalObject, CallFrame* callFrame, FILE* out, bool legacy)
 {
     VM& vm = globalObject->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);
@@ -1277,13 +1280,11 @@ static EncodedJSValue printInternal(JSGlobalObject* globalObject, CallFrame* cal
             if (EOF == fputc(' ', out))
                 goto fail;
 
-        auto* jsString = callFrame->uncheckedArgument(i).toString(globalObject);
+        String string = legacy ? callFrame->uncheckedArgument(i).toWTFString(globalObject) : callFrame->uncheckedArgument(i).toWTFStringForConsole(globalObject);
         RETURN_IF_EXCEPTION(scope, { });
-        auto viewWithString = jsString->viewWithUnderlyingString(globalObject);
+        auto cString = toCString(globalObject, scope, string);
         RETURN_IF_EXCEPTION(scope, { });
-        auto string = cStringFromViewWithString(globalObject, scope, viewWithString);
-        RETURN_IF_EXCEPTION(scope, { });
-        fwrite(string.data(), sizeof(char), string.length(), out);
+        fwrite(cString.data(), sizeof(char), cString.length(), out);
         if (ferror(out))
             goto fail;
     }
@@ -1296,12 +1297,17 @@ static EncodedJSValue printInternal(JSGlobalObject* globalObject, CallFrame* cal
 
 JSC_DEFINE_HOST_FUNCTION(functionPrintStdOut, (JSGlobalObject* globalObject, CallFrame* callFrame))
 {
-    return printInternal(globalObject, callFrame, stdout);
+    return printInternal(globalObject, callFrame, stdout, false);
 }
 
 JSC_DEFINE_HOST_FUNCTION(functionPrintStdErr, (JSGlobalObject* globalObject, CallFrame* callFrame))
 {
-    return printInternal(globalObject, callFrame, stderr);
+    return printInternal(globalObject, callFrame, stderr, false);
+}
+
+JSC_DEFINE_HOST_FUNCTION(functionLegacyPrint, (JSGlobalObject* globalObject, CallFrame* callFrame))
+{
+    return printInternal(globalObject, callFrame, stdout, true);
 }
 
 JSC_DEFINE_HOST_FUNCTION(functionDebug, (JSGlobalObject* globalObject, CallFrame* callFrame))
@@ -1312,7 +1318,7 @@ JSC_DEFINE_HOST_FUNCTION(functionDebug, (JSGlobalObject* globalObject, CallFrame
     RETURN_IF_EXCEPTION(scope, { });
     auto viewWithString = jsString->viewWithUnderlyingString(globalObject);
     RETURN_IF_EXCEPTION(scope, { });
-    auto string = cStringFromViewWithString(globalObject, scope, viewWithString);
+    auto string = toCString(globalObject, scope, viewWithString.view);
     RETURN_IF_EXCEPTION(scope, { });
     fputs("--> ", stderr);
     fwrite(string.data(), sizeof(char), string.length(), stderr);
@@ -3271,7 +3277,7 @@ static void runInteractive(GlobalObject* globalObject)
             fputs("Exception: ", stdout);
             utf8 = evaluationException->value().toWTFString(globalObject).tryGetUtf8();
         } else
-            utf8 = returnValue.toWTFString(globalObject).tryGetUtf8();
+            utf8 = returnValue.toWTFStringForConsole(globalObject).tryGetUtf8();
 
         CString result;
         if (utf8)

Source/JavaScriptCore/runtime/JSCJSValue.cpp

@@ -471,4 +471,19 @@ NEVER_INLINE void ensureStillAliveHere(JSValue)
 }
 #endif
 
+WTF::String JSValue::toWTFStringForConsole(JSGlobalObject* globalObject) const
+{
+    VM& vm = globalObject->vm();
+    auto scope = DECLARE_THROW_SCOPE(vm);
+    JSString* string = toString(globalObject);
+    RETURN_IF_EXCEPTION(scope, { });
+    String result = string->value(globalObject);
+    RETURN_IF_EXCEPTION(scope, { });
+    if (isString())
+        return makeString("\"", result, "\"");
+    if (jsDynamicCast<JSArray*>(vm, *this))
+        return makeString("[", result, "]");
+    return result;
+}
+
 } // namespace JSC

Source/JavaScriptCore/runtime/JSCJSValue.h

@@ -289,6 +289,7 @@ class JSValue {
     Identifier toPropertyKey(JSGlobalObject*) const;
     JSValue toPropertyKeyValue(JSGlobalObject*) const;
     WTF::String toWTFString(JSGlobalObject*) const;
+    JS_EXPORT_PRIVATE WTF::String toWTFStringForConsole(JSGlobalObject*) const;
     JSObject* toObject(JSGlobalObject*) const;
 
     // Integer conversions.