fix varargs on ARM

java-native-access · Feb 7, 2016 · 50eb820 · 50eb820
1 parent 51cab75
commit 50eb820
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Showing 10 changed files with 87 additions and 24 deletions.
diff --git a/CHANGES.md b/CHANGES.md
@@ -43,6 +43,7 @@ Bug Fixes
 * [#531](https://github.com/java-native-access/jna/pull/531): Ensure direct-mapped callbacks use the right calling convention - [@twall](https://github.com/twall).
 * [#566](https://github.com/java-native-access/jna/pull/566): Fix return type of Native#loadLibrary to match unconstrained generic [@lgoldstein](https://github.com/lgoldstein)
 * [#584](https://github.com/java-native-access/jna/pull/584): Promote float varargs to double - [@marco2357](https://github.com/marco2357).
+* [#588](https://github.com/java-native-access/jna/pull/588): Fix varargs calls on arm - [@twall](https://github.com/twall).
 
 Release 4.2.1
 =============

diff --git a/build.xml b/build.xml
@@ -69,7 +69,7 @@
   <!-- jnidispatch library release version -->
   <property name="jni.major" value="5"/>
   <property name="jni.minor" value="0"/>
-  <property name="jni.revision" value="1"/>
+  <property name="jni.revision" value="0"/>
   <property name="jni.build" value="0"/> <!--${build.number}-->
   <property name="jni.version" value="${jni.major}.${jni.minor}.${jni.revision}"/>
   <property name="jni.md5" value="4f72f2799dfee6008a386bc40afd7428"/>

diff --git a/lib/native/linux-arm.jar b/lib/native/linux-arm.jar
diff --git a/native/Makefile b/native/Makefile
@@ -50,7 +50,7 @@ OS=$(shell uname | sed -e 's/CYGWIN.*/win32/g' \
                         -e 's/AIX.*/aix/g' \
                         -e 's/Linux.*/linux/g')
 
-JNA_JNI_VERSION=5.0.1 # auto-generated by ant
+JNA_JNI_VERSION=5.0.0 # auto-generated by ant
 CHECKSUM=4f72f2799dfee6008a386bc40afd7428 # auto-generated by ant
 
 JAVA_INCLUDES=-I"$(JAVA_HOME)/include" \

diff --git a/native/dispatch.c b/native/dispatch.c
@@ -108,6 +108,7 @@ extern "C" {
 
 #define MASK_CC          com_sun_jna_Function_MASK_CC
 #define THROW_LAST_ERROR com_sun_jna_Function_THROW_LAST_ERROR
+#define USE_VARARGS      com_sun_jna_Function_USE_VARARGS
 
 /* Cached class, field and method IDs */
 static jclass classObject;
@@ -436,6 +437,7 @@ dispatch(JNIEnv *env, void* func, jint flags, jobjectArray args,
   callconv_t callconv = flags & MASK_CC;
   const char* volatile throw_type = NULL;
   const char* volatile throw_msg = NULL;
+  int fixed_args = (flags & USE_VARARGS) >> 7;
 
   nargs = (*env)->GetArrayLength(env, args);
 
@@ -610,7 +612,9 @@ dispatch(JNIEnv *env, void* func, jint flags, jobjectArray args,
     break;
   }
 
-  status = ffi_prep_cif(&cif, abi, nargs, return_type, arg_types);
+  status = fixed_args
+    ? ffi_prep_cif_var(&cif, abi, fixed_args, nargs, return_type, arg_types)
+    : ffi_prep_cif(&cif, abi, nargs, return_type, arg_types);
   if (!ffi_error(env, "Native call setup", status)) {
     PSTART();
     if ((flags & THROW_LAST_ERROR) != 0) {

diff --git a/native/testlib.c b/native/testlib.c
@@ -855,12 +855,14 @@ fillDoubleBuffer(double *buf, int len, double value) {
   return len;
 }
 
+#include "ffi.h"
+
 EXPORT int32_t
-addInt32VarArgs(const char *fmt, ...) {
+addVarArgs(const char *fmt, ...) {
   va_list ap;
   int32_t sum = 0;
   va_start(ap, fmt);
-  
+
   while (*fmt) {
     switch (*fmt++) {
     case 'd':
@@ -873,7 +875,7 @@ addInt32VarArgs(const char *fmt, ...) {
       sum += (int) va_arg(ap, int);
       break;
     case 'f': // float (promoted to ‘double’ when passed through ‘...’)
-    case 'F': // double
+    case 'g': // double
       sum += va_arg(ap, double);
       break;
     default:

diff --git a/src/com/sun/jna/Function.java b/src/com/sun/jna/Function.java
@@ -59,6 +59,8 @@ public interface PostCallRead {
     private static final int MASK_CC = 0x3F;
     /** Whether to throw an exception if last error is non-zero after call. */
     public static final int THROW_LAST_ERROR = 0x40;
+    /** Mask for number of fixed args (1-3) for varargs calls. */
+    public static final int USE_VARARGS = 0x180;
 
     static final Integer INTEGER_TRUE = Integer.valueOf(-1);
     static final Integer INTEGER_FALSE = Integer.valueOf(0);
@@ -293,10 +295,10 @@ Object invoke(Method invokingMethod, Class<?>[] paramTypes, Class<?> returnType,
 
         TypeMapper mapper = (TypeMapper)options.get(Library.OPTION_TYPE_MAPPER);
         boolean allowObjects = Boolean.TRUE.equals(options.get(Library.OPTION_ALLOW_OBJECTS));
-        boolean isVarArgs = args.length > 0 && invokingMethod != null ? isVarArgs(invokingMethod) : false;
+        int fixedArgs = args.length > 0 && invokingMethod != null ? fixedArgs(invokingMethod) : 0;
         for (int i=0; i < args.length; i++) {
             Class<?> paramType = invokingMethod != null
-                ? (isVarArgs && i >= paramTypes.length-1
+                ? (fixedArgs > 0 && i >= paramTypes.length-1
                    ? paramTypes[paramTypes.length-1].getComponentType()
                    : paramTypes[i])
                 : null;
@@ -316,7 +318,7 @@ Object invoke(Method invokingMethod, Class<?>[] paramTypes, Class<?> returnType,
             }
         }
 
-        Object result = invoke(args, nativeReturnType, allowObjects);
+        Object result = invoke(args, nativeReturnType, allowObjects, fixedArgs);
         // Convert the result to a custom value/type if appropriate
         if (resultConverter != null) {
             FromNativeContext context;
@@ -362,7 +364,13 @@ Object invoke(Method invokingMethod, Class<?>[] paramTypes, Class<?> returnType,
 
     /* @see NativeLibrary#NativeLibrary(String,String,long,Map) implementation */
     Object invoke(Object[] args, Class<?> returnType, boolean allowObjects) {
+	return invoke(args, returnType, allowObjects, 0);
+    }
+
+    /* @see NativeLibrary#NativeLibrary(String,String,long,Map) implementation */
+    Object invoke(Object[] args, Class<?> returnType, boolean allowObjects, int fixedArgs) {
         Object result = null;
+	int callFlags = this.callFlags | ((fixedArgs & 0x3) << 7);
         if (returnType == null || returnType==void.class || returnType==Void.class) {
             Native.invokeVoid(peer, callFlags, args);
             result = null;
@@ -752,6 +760,11 @@ static boolean isVarArgs(Method m) {
         return IS_VARARGS.isVarArgs(m);
     }
 
+    /** Varargs are only supported on 1.5+. */
+    static int fixedArgs(Method m) {
+        return IS_VARARGS.fixedArgs(m);
+    }
+
     private static class NativeMappedArray extends Memory implements PostCallRead {
         private final NativeMapped[] original;
         public NativeMappedArray(NativeMapped[] arg) {

diff --git a/src/com/sun/jna/VarArgsChecker.java b/src/com/sun/jna/VarArgsChecker.java
@@ -25,6 +25,10 @@ boolean isVarArgs(Method m) {
             return m.isVarArgs();
         }
 
+	int fixedArgs(Method m) {
+	    // In Java, final argument contains all "varargs"
+	    return m.getParameterTypes().length - 1;
+	}
     }
 
     /**
@@ -37,6 +41,9 @@ boolean isVarArgs(Method m) {
             return false;
         }
 
+	int fixedArgs(Method m) {
+	    return 0;
+	}
     }
 
     /**
@@ -68,4 +75,10 @@ static VarArgsChecker create() {
      */
     abstract boolean isVarArgs(Method m);
 
+    /**
+     * If variadic, returns the number of fixed arguments to the method.
+     * @param m Method to be checked
+     * @return Number of fixed arguments if the given method takes a variable number of arguments, zero otherwise.
+     */
+    abstract int fixedArgs(Method m);
 }
diff --git a/test/com/sun/jna/VarArgsCheckerTest.java b/test/com/sun/jna/VarArgsCheckerTest.java
@@ -16,7 +16,7 @@ public void testNoVarArgs() throws Exception {
         final Method toCheckForVarArgs = VarArgsCheckerTest.class.getMethod("testNoVarArgs", new Class[0]);
         final boolean res = sut.isVarArgs(toCheckForVarArgs);
         // no matter if JVM 1.4 or 1.5+, the result should always be false
-        assertFalse(res);
+        assertFalse("Method should not be detected as varargs", res);
     }
 
     public void testVarArgsExist() throws Exception {
@@ -25,10 +25,40 @@ public void testVarArgsExist() throws Exception {
         final boolean res = sut.isVarArgs(toCheckForVarArgs);
         // this test has to run with Java 1.5+, because this has a method with
         // varargs. So the result has to be true.
-        assertTrue(res);
+        assertTrue("Method should be detected as varargs", res);
+    }
+
+    public void testFixedArgsOne() throws Exception {
+        final VarArgsChecker checker = VarArgsChecker.create();
+        final Method method = VarArgsCheckerTest.class.getMethod("methodWithOneFixedArg", new Class[]{String.class, Object[].class});
+        final int res = checker.fixedArgs(method);
+        // this test has to run with Java 1.5+, because this has a method with
+        // varargs. So the result has to be true.
+        assertEquals("Wrong number of fixed args", 1, res);
+    }
+
+    public void testFixedArgsTwo() throws Exception {
+        final VarArgsChecker checker = VarArgsChecker.create();
+        final Method method = VarArgsCheckerTest.class.getMethod("methodWithTwoFixedArgs", new Class[]{String.class, String.class, Object[].class});
+        final int res = checker.fixedArgs(method);
+        // this test has to run with Java 1.5+, because this has a method with
+        // varargs. So the result has to be true.
+        assertEquals("Wrong number of fixed args", 2, res);
     }
 
     public void methodWithVarArgs(String... args) {
-        System.out.println();
+        // nothing to do
+    }
+
+    public void methodWithOneFixedArg(String fmt, Object... args) {
+	// nothing to do
+    }
+
+    public void methodWithTwoFixedArgs(String fmt, String fmt2, Object... args) {
+	// nothing to do
+    }
+
+    public static void main(String[] args) {
+        junit.textui.TestRunner.run(VarArgsCheckerTest.class);
     }
 }
diff --git a/test/com/sun/jna/VarArgsTest.java b/test/com/sun/jna/VarArgsTest.java
@@ -29,7 +29,7 @@ protected List<String> getFieldOrder() {
                 return Arrays.asList("magic");
             }
         }
-        public int addInt32VarArgs(String fmt, Number... args);
+        public int addVarArgs(String fmt, Number... args);
         public String returnStringVarArgs(String fmt, Object... args);
         public void modifyStructureVarArgs(String fmt, Object arg1, Object... args);
     }
@@ -45,32 +45,32 @@ protected void tearDown() {
     public void testIntVarArgs() {
         int arg1 = 1;
         int arg2 = 2;
-        assertEquals("VarArgs not added correctly", arg1 + arg2,
-                     lib.addInt32VarArgs("dd", Integer.valueOf(arg1), Integer.valueOf(arg2)));
+        assertEquals("32-bit integer varargs not added correctly", arg1 + arg2,
+                     lib.addVarArgs("dd", Integer.valueOf(arg1), Integer.valueOf(arg2)));
     }
     public void testShortVarArgs() {
         short arg1 = 1;
         short arg2 = 2;
-        assertEquals("VarArgs not added correctly", arg1 + arg2,
-                     lib.addInt32VarArgs("dd", Short.valueOf(arg1), Short.valueOf(arg2)));
+        assertEquals("16-bit integer varargs not added correctly", arg1 + arg2,
+                     lib.addVarArgs("dd", Short.valueOf(arg1), Short.valueOf(arg2)));
     }
     public void testLongVarArgs() {
         short arg1 = 1;
         short arg2 = 2;
-        assertEquals("VarArgs not added correctly", arg1 + arg2,
-                     lib.addInt32VarArgs("ll", Long.valueOf(arg1), Long.valueOf(arg2)));
+        assertEquals("64-bit integer varargs not added correctly", arg1 + arg2,
+                     lib.addVarArgs("ll", Long.valueOf(arg1), Long.valueOf(arg2)));
     }
     public void testFloatVarArgs() {
         float arg1 = 1;
         float arg2 = 2;
-        assertEquals("VarArgs not added correctly", (int)arg1 + (int)arg2,
-                     lib.addInt32VarArgs("ff", Float.valueOf(arg1), Float.valueOf(arg2)));
+        assertEquals("float varargs not added correctly", (int)arg1 + (int)arg2,
+                     lib.addVarArgs("ff", Float.valueOf(arg1), Float.valueOf(arg2)));
     }
     public void testDoubleVarArgs() {
         double arg1 = 1;
         double arg2 = 2;
-        assertEquals("VarArgs not added correctly", (int)arg1 + (int)arg2,
-                     lib.addInt32VarArgs("FF", Double.valueOf(arg1), Double.valueOf(arg2)));
+        assertEquals("double varargs not added correctly", (int)arg1 + (int)arg2,
+                     lib.addVarArgs("gg", Double.valueOf(arg1), Double.valueOf(arg2)));
     }
     public void testStringVarArgs() {
         Object[] args = new Object[] { "Test" };
@@ -81,7 +81,7 @@ public void testStringVarArgs() {
     public void testAppendNullToVarargs() {
         Number[] args = new Number[] { Integer.valueOf(1) };
         assertEquals("No trailing NULL was appended to varargs list",
-                     1, lib.addInt32VarArgs("dd", args));
+                     1, lib.addVarArgs("dd", args));
     }
 
     public void testModifyStructureInVarargs() {