8269223: -Xcheck:jni WARNINGs working with fonts on Linux

src/java.desktop/share/native/libfontmanager/freetypeScaler.c

@@ -46,6 +46,12 @@
 
 #include "fontscaler.h"
 
+#define CHECK_EXCEPTION(env, describe)                 \
+    if ((*(env))->ExceptionCheck(env)) {               \
+        if (describe) (*(env))->ExceptionDescribe(env);\
+        else          (*(env))->ExceptionClear(env);   \
+    }
+
 #define  ftFixed1  (FT_Fixed) (1 << 16)
 #define  FloatToFTFixed(f) (FT_Fixed)((f) * (float)(ftFixed1))
 #define  FTFixedToFloat(x) ((x) / (float)(ftFixed1))
@@ -97,12 +103,18 @@ void z_error(char *s) {}
 /**************** Error handling utilities *****************/
 
 static jmethodID invalidateScalerMID;
+static jboolean  debugFonts; // Stores the value of FontUtilities.debugFonts()
 
 JNIEXPORT void JNICALL
 Java_sun_font_FreetypeFontScaler_initIDs(
         JNIEnv *env, jobject scaler, jclass FFSClass) {
     invalidateScalerMID =
         (*env)->GetMethodID(env, FFSClass, "invalidateScaler", "()V");
+
+    jboolean ignoreException;
+    debugFonts = JNU_CallStaticMethodByName(env, &ignoreException,
+                                            "sun/font/FontUtilities",
+                                            "debugFonts", "()Z").z;
 }
 
 static void freeNativeResources(JNIEnv *env, FTScalerInfo* scalerInfo) {
@@ -137,6 +149,9 @@ static void invalidateJavaScaler(JNIEnv *env,
                                  FTScalerInfo* scalerInfo) {
     freeNativeResources(env, scalerInfo);
     (*env)->CallVoidMethod(env, scaler, invalidateScalerMID);
+    // NB: Exceptions must not be cleared (and therefore no JNI calls
+    // performed) after calling this method because it intentionally
+    // leaves an exception pending.
 }
 
 /******************* I/O handlers ***************************/
@@ -187,6 +202,7 @@ static unsigned long ReadTTFontFileFunc(FT_Stream stream,
                                           scalerInfo->font2D,
                                           sunFontIDs.ttReadBlockMID,
                                           bBuffer, offset, numBytes);
+            CHECK_EXCEPTION(env, debugFonts);
             if (bread < 0) {
                 return 0;
             } else {
@@ -206,7 +222,8 @@ static unsigned long ReadTTFontFileFunc(FT_Stream stream,
             (*env)->CallObjectMethod(env, scalerInfo->font2D,
                                      sunFontIDs.ttReadBytesMID,
                                      offset, numBytes);
-            /* If there's an OutofMemoryError then byteArray will be null */
+            CHECK_EXCEPTION(env, debugFonts);
+            /* If there's an OutOfMemoryError then byteArray will be null */
             if (byteArray == NULL) {
                 return 0;
             } else {
@@ -239,6 +256,7 @@ static unsigned long ReadTTFontFileFunc(FT_Stream stream,
                                       sunFontIDs.ttReadBlockMID,
                                       bBuffer, offset,
                                       scalerInfo->fontDataLength);
+        CHECK_EXCEPTION(env, debugFonts);
         if (bread <= 0) {
             return 0;
         } else if ((unsigned long)bread < numBytes) {

src/java.desktop/windows/native/libawt/java2d/d3d/D3DRenderQueue.cpp

@@ -866,7 +866,8 @@ void D3DRQ_FlushBuffer(void *pParam)
 
     if (!JNU_IsNull(env, pFlush->runnable)) {
         J2dTraceLn(J2D_TRACE_VERBOSE, "  executing runnable");
-        JNU_CallMethodByName(env, NULL, pFlush->runnable, "run", "()V");
+        jboolean ignoreException;
+        JNU_CallMethodByName(env, &ignoreException, pFlush->runnable, "run", "()V");
     }
 }
 

src/java.desktop/windows/native/libawt/windows/awt_Component.cpp

@@ -6569,11 +6569,11 @@ JNIEXPORT void JNICALL
 Java_java_awt_Component_initIDs(JNIEnv *env, jclass cls)
 {
     TRY;
-    jclass inputEventClazz = env->FindClass("java/awt/event/InputEvent");
-    CHECK_NULL(inputEventClazz);
-    jmethodID getButtonDownMasksID = env->GetStaticMethodID(inputEventClazz, "getButtonDownMasks", "()[I");
-    CHECK_NULL(getButtonDownMasksID);
-    jintArray obj = (jintArray)env->CallStaticObjectMethod(inputEventClazz, getButtonDownMasksID);
+    jboolean ignoreException;
+    jintArray obj = (jintArray)JNU_CallStaticMethodByName(env, &ignoreException,
+                                                          "java/awt/event/InputEvent",
+                                                          "getButtonDownMasks", "()[I").l;
+    CHECK_NULL(obj);
     jint * tmp = env->GetIntArrayElements(obj, JNI_FALSE);
     CHECK_NULL(tmp);
     jsize len = env->GetArrayLength(obj);

src/java.desktop/windows/native/libawt/windows/awt_DesktopProperties.cpp

@@ -752,6 +752,7 @@ void AwtDesktopProperties::SetStringProperty(LPCTSTR propName, LPTSTR value) {
                              key, jValue);
     GetEnv()->DeleteLocalRef(jValue);
     GetEnv()->DeleteLocalRef(key);
+    (void)safe_ExceptionOccurred(GetEnv());
 }
 
 void AwtDesktopProperties::SetIntegerProperty(LPCTSTR propName, int value) {
@@ -764,6 +765,7 @@ void AwtDesktopProperties::SetIntegerProperty(LPCTSTR propName, int value) {
                              AwtDesktopProperties::setIntegerPropertyID,
                              key, (jint)value);
     GetEnv()->DeleteLocalRef(key);
+    (void)safe_ExceptionOccurred(GetEnv());
 }
 
 void AwtDesktopProperties::SetBooleanProperty(LPCTSTR propName, BOOL value) {
@@ -775,6 +777,7 @@ void AwtDesktopProperties::SetBooleanProperty(LPCTSTR propName, BOOL value) {
                              AwtDesktopProperties::setBooleanPropertyID,
                              key, value ? JNI_TRUE : JNI_FALSE);
     GetEnv()->DeleteLocalRef(key);
+    (void)safe_ExceptionOccurred(GetEnv());
 }
 
 void AwtDesktopProperties::SetColorProperty(LPCTSTR propName, DWORD value) {
@@ -787,6 +790,7 @@ void AwtDesktopProperties::SetColorProperty(LPCTSTR propName, DWORD value) {
                              key, GetRValue(value), GetGValue(value),
                              GetBValue(value));
     GetEnv()->DeleteLocalRef(key);
+    (void)safe_ExceptionOccurred(GetEnv());
 }
 
 void AwtDesktopProperties::SetFontProperty(HDC dc, int fontID,
@@ -849,6 +853,7 @@ void AwtDesktopProperties::SetFontProperty(HDC dc, int fontID,
                               key, fontName, style, pointSize);
                     GetEnv()->DeleteLocalRef(key);
                     GetEnv()->DeleteLocalRef(fontName);
+                    (void)safe_ExceptionOccurred(GetEnv());
                 }
             }
             delete[] face;
@@ -896,6 +901,7 @@ void AwtDesktopProperties::SetFontProperty(LPCTSTR propName, const LOGFONT & fon
                              key, fontName, style, pointSize);
     GetEnv()->DeleteLocalRef(key);
     GetEnv()->DeleteLocalRef(fontName);
+    (void)safe_ExceptionOccurred(GetEnv());
 }
 
 void AwtDesktopProperties::SetSoundProperty(LPCTSTR propName, LPCTSTR winEventName) {
@@ -913,6 +919,7 @@ void AwtDesktopProperties::SetSoundProperty(LPCTSTR propName, LPCTSTR winEventNa
                              key, event);
     GetEnv()->DeleteLocalRef(event);
     GetEnv()->DeleteLocalRef(key);
+    (void)safe_ExceptionOccurred(GetEnv());
 }
 
 void AwtDesktopProperties::PlayWindowsSound(LPCTSTR event) {

test/jdk/java/awt/font/JNICheck/FreeTypeScalerJNICheck.java

@@ -0,0 +1,68 @@
+/*
+ * Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2021, JetBrains s.r.o.. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/* @test
+ * @bug 8269223
+ * @summary Verifies that -Xcheck:jni issues no warnings from freetypeScaler.c
+ * @library /test/lib
+ * @key headful
+ * @run main FreeTypeScalerJNICheck
+ */
+import javax.swing.*;
+import java.awt.*;
+import java.awt.geom.Rectangle2D;
+import java.awt.image.*;
+import java.io.*;
+import jdk.test.lib.process.ProcessTools;
+import jdk.test.lib.process.OutputAnalyzer;
+
+public class FreeTypeScalerJNICheck {
+    public static void main(String[] args) throws Exception {
+        if (args.length > 0 && args[0].equals("runtest")) {
+            runTest();
+        } else {
+            ProcessBuilder pb = ProcessTools.createTestJvm("-Xcheck:jni", FreeTypeScalerJNICheck.class.getName(), "runtest");
+            OutputAnalyzer oa = ProcessTools.executeProcess(pb);
+            oa.shouldContain("Done").shouldNotContain("WARNING").shouldHaveExitValue(0);
+        }
+    }
+
+    public static void runTest() {
+        String families[] = GraphicsEnvironment.getLocalGraphicsEnvironment().getAvailableFontFamilyNames();
+        JFrame frame = new JFrame("test");
+        BufferedImage bi = new BufferedImage(1, 1, BufferedImage.TYPE_INT_RGB);
+        Graphics2D g2d = bi.createGraphics();
+
+        for (String ff : families)
+        {
+            Font font = Font.decode(ff);
+            Rectangle2D bounds = font.getStringBounds("test", g2d.getFontRenderContext());
+            FontMetrics metrics = frame.getFontMetrics(font);
+            System.out.println(bounds.getHeight() + metrics.getHeight()); // use bounds and metrics
+        }
+
+        System.out.println("Done");
+    }
+}
+