546 lines
14 KiB
C++
546 lines
14 KiB
C++
// natMethod.cc - Native code for Method class.
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/* Copyright (C) 1998, 1999, 2000 Free Software Foundation
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This file is part of libgcj.
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This software is copyrighted work licensed under the terms of the
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Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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details. */
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#include <config.h>
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#include <alloca.h>
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#include <gcj/cni.h>
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#include <jvm.h>
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#include <jni.h>
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#include <java/lang/reflect/Method.h>
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#include <java/lang/reflect/Constructor.h>
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#include <java/lang/reflect/InvocationTargetException.h>
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#include <java/lang/reflect/Modifier.h>
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#include <java/lang/Void.h>
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#include <java/lang/Byte.h>
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#include <java/lang/Boolean.h>
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#include <java/lang/Character.h>
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#include <java/lang/Short.h>
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#include <java/lang/Integer.h>
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#include <java/lang/Long.h>
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#include <java/lang/Float.h>
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#include <java/lang/Double.h>
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#include <java/lang/IllegalArgumentException.h>
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#include <java/lang/NullPointerException.h>
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#include <java/lang/Class.h>
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#include <gcj/method.h>
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#include <gnu/gcj/RawData.h>
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#define ObjectClass _CL_Q34java4lang6Object
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extern java::lang::Class ObjectClass;
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#define ClassClass _CL_Q34java4lang5Class
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extern java::lang::Class ClassClass;
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#include <stdlib.h>
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#include <ffi.h>
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#define VoidClass _CL_Q34java4lang4Void
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extern java::lang::Class VoidClass;
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#define ByteClass _CL_Q34java4lang4Byte
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extern java::lang::Class ByteClass;
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#define ShortClass _CL_Q34java4lang5Short
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extern java::lang::Class ShortClass;
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#define CharacterClass _CL_Q34java4lang9Character
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extern java::lang::Class CharacterClass;
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#define IntegerClass _CL_Q34java4lang7Integer
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extern java::lang::Class IntegerClass;
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#define LongClass _CL_Q34java4lang4Long
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extern java::lang::Class LongClass;
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#define FloatClass _CL_Q34java4lang5Float
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extern java::lang::Class FloatClass;
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#define DoubleClass _CL_Q34java4lang6Double
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extern java::lang::Class DoubleClass;
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struct cpair
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{
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jclass prim;
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jclass wrap;
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};
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// This is used to determine when a primitive widening conversion is
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// allowed.
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static cpair primitives[] =
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{
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#define VOID 0
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{ JvPrimClass (void), &VoidClass },
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{ JvPrimClass (byte), &ByteClass },
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#define SHORT 2
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{ JvPrimClass (short), &ShortClass },
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#define CHAR 3
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{ JvPrimClass (char), &CharacterClass },
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{ JvPrimClass (int), &IntegerClass },
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{ JvPrimClass (long), &LongClass },
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{ JvPrimClass (float), &FloatClass },
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{ JvPrimClass (double), &DoubleClass },
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{ NULL, NULL }
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};
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static jboolean
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can_widen (jclass from, jclass to)
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{
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int fromx = -1, tox = -1;
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for (int i = 0; primitives[i].prim; ++i)
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{
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if (primitives[i].wrap == from)
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fromx = i;
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if (primitives[i].prim == to)
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tox = i;
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}
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// Can't handle a miss.
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if (fromx == -1 || tox == -1)
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return false;
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// Can't handle Void arguments.
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if (fromx == VOID || tox == VOID)
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return false;
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// Special-case short/char conversions.
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if ((fromx == SHORT && tox == CHAR) || (fromx == CHAR && tox == SHORT))
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return false;
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return fromx <= tox;
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}
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static ffi_type *
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get_ffi_type (jclass klass)
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{
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// A special case.
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if (klass == NULL)
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return &ffi_type_pointer;
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ffi_type *r;
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if (klass == JvPrimClass (byte))
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r = &ffi_type_sint8;
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else if (klass == JvPrimClass (short))
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r = &ffi_type_sint16;
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else if (klass == JvPrimClass (int))
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r = &ffi_type_sint32;
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else if (klass == JvPrimClass (long))
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r = &ffi_type_sint64;
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else if (klass == JvPrimClass (float))
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r = &ffi_type_float;
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else if (klass == JvPrimClass (double))
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r = &ffi_type_double;
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else if (klass == JvPrimClass (boolean))
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{
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// On some platforms a bool is a byte, on others an int.
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if (sizeof (jboolean) == sizeof (jbyte))
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r = &ffi_type_sint8;
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else
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{
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JvAssert (sizeof (jboolean) == sizeof (jint));
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r = &ffi_type_sint32;
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}
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}
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else if (klass == JvPrimClass (char))
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r = &ffi_type_uint16;
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else
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{
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JvAssert (! klass->isPrimitive());
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r = &ffi_type_pointer;
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}
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return r;
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}
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jobject
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java::lang::reflect::Method::invoke (jobject obj, jobjectArray args)
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{
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if (parameter_types == NULL)
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getType ();
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jmethodID meth = _Jv_FromReflectedMethod (this);
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if (! java::lang::reflect::Modifier::isStatic(meth->accflags))
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{
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jclass k = obj ? obj->getClass() : NULL;
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if (! obj)
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JvThrow (new java::lang::NullPointerException);
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if (! declaringClass->isAssignableFrom(k))
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JvThrow (new java::lang::IllegalArgumentException);
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// FIXME: access checks.
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// Find the possibly overloaded method based on the runtime type
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// of the object.
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meth = _Jv_LookupDeclaredMethod (k, meth->name, meth->signature);
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}
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return _Jv_CallAnyMethodA (obj, return_type, meth, false,
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parameter_types, args);
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}
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jint
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java::lang::reflect::Method::getModifiers ()
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{
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return _Jv_FromReflectedMethod (this)->accflags;
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}
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jstring
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java::lang::reflect::Method::getName ()
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{
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if (name == NULL)
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name = _Jv_NewStringUtf8Const (_Jv_FromReflectedMethod (this)->name);
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return name;
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}
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/* Internal method to set return_type and parameter_types fields. */
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void
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java::lang::reflect::Method::getType ()
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{
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_Jv_GetTypesFromSignature (_Jv_FromReflectedMethod (this),
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declaringClass,
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¶meter_types,
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&return_type);
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}
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void
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_Jv_GetTypesFromSignature (jmethodID method,
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jclass declaringClass,
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JArray<jclass> **arg_types_out,
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jclass *return_type_out)
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{
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_Jv_Utf8Const* sig = method->signature;
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java::lang::ClassLoader *loader = declaringClass->getClassLoader();
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char *ptr = sig->data;
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int numArgs = 0;
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/* First just count the number of parameters. */
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for (; ; ptr++)
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{
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switch (*ptr)
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{
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case 0:
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case ')':
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case 'V':
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break;
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case '[':
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case '(':
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continue;
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case 'B':
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case 'C':
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case 'D':
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case 'F':
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case 'S':
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case 'I':
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case 'J':
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case 'Z':
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numArgs++;
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continue;
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case 'L':
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numArgs++;
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do
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ptr++;
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while (*ptr != ';' && ptr[1] != '\0');
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continue;
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}
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break;
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}
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JArray<jclass> *args = (JArray<jclass> *)
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JvNewObjectArray (numArgs, &ClassClass, NULL);
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jclass* argPtr = elements (args);
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for (ptr = sig->data; *ptr != '\0'; ptr++)
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{
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int num_arrays = 0;
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jclass type;
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for (; *ptr == '['; ptr++)
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num_arrays++;
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switch (*ptr)
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{
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default:
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return;
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case ')':
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argPtr = return_type_out;
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continue;
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case '(':
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continue;
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case 'V':
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case 'B':
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case 'C':
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case 'D':
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case 'F':
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case 'S':
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case 'I':
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case 'J':
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case 'Z':
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type = _Jv_FindClassFromSignature(ptr, loader);
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break;
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case 'L':
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type = _Jv_FindClassFromSignature(ptr, loader);
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do
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ptr++;
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while (*ptr != ';' && ptr[1] != '\0');
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break;
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}
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// FIXME: 2'nd argument should be "current loader"
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while (--num_arrays >= 0)
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type = _Jv_FindArrayClass (type, 0);
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// ARGPTR can be NULL if we are processing the return value of a
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// call from Constructor.
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if (argPtr)
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*argPtr++ = type;
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}
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*arg_types_out = args;
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}
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// This is a very rough analog of the JNI CallNonvirtual<type>MethodA
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// functions. It handles both Methods and Constructors, and it can
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// handle any return type. In the Constructor case, the `obj'
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// argument is unused and should be NULL; also, the `return_type' is
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// the class that the constructor will construct. RESULT is a pointer
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// to a `jvalue' (see jni.h); for a void method this should be NULL.
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// This function returns an exception (if one was thrown), or NULL if
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// the call went ok.
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jthrowable
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_Jv_CallAnyMethodA (jobject obj,
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jclass return_type,
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jmethodID meth,
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jboolean is_constructor,
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JArray<jclass> *parameter_types,
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jvalue *args,
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jvalue *result)
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{
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JvAssert (! is_constructor || ! obj);
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JvAssert (! is_constructor || ! return_type);
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// See whether call needs an object as the first argument. A
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// constructor does need a `this' argument, but it is one we create.
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jboolean needs_this = false;
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if (is_constructor
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|| ! java::lang::reflect::Modifier::isStatic(meth->accflags))
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needs_this = true;
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int param_count = parameter_types->length;
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if (needs_this)
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++param_count;
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ffi_type *rtype;
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// A constructor itself always returns void.
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if (is_constructor || return_type == JvPrimClass (void))
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rtype = &ffi_type_void;
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else
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rtype = get_ffi_type (return_type);
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ffi_type **argtypes = (ffi_type **) alloca (param_count
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* sizeof (ffi_type *));
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jclass *paramelts = elements (parameter_types);
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// FIXME: at some point the compiler is going to add extra arguments
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// to some functions. In particular we are going to do this for
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// handling access checks in reflection. We must add these hidden
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// arguments here.
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// Special case for the `this' argument of a constructor. Note that
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// the JDK 1.2 docs specify that the new object must be allocated
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// before argument conversions are done.
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if (is_constructor)
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{
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// FIXME: must special-case String, arrays, maybe others here.
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obj = JvAllocObject (return_type);
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}
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int i = 0;
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int size = 0;
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if (needs_this)
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{
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// The `NULL' type is `Object'.
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argtypes[i++] = get_ffi_type (NULL);
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size += sizeof (jobject);
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}
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for (int arg = 0; i < param_count; ++i, ++arg)
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{
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argtypes[i] = get_ffi_type (paramelts[arg]);
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if (paramelts[arg]->isPrimitive())
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size += paramelts[arg]->size();
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else
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size += sizeof (jobject);
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}
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ffi_cif cif;
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if (ffi_prep_cif (&cif, FFI_DEFAULT_ABI, param_count,
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rtype, argtypes) != FFI_OK)
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{
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// FIXME: throw some kind of VirtualMachineError here.
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}
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char *p = (char *) alloca (size);
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void **values = (void **) alloca (param_count * sizeof (void *));
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i = 0;
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if (needs_this)
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{
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values[i] = p;
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memcpy (p, &obj, sizeof (jobject));
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p += sizeof (jobject);
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++i;
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}
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for (int arg = 0; i < param_count; ++i, ++arg)
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{
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int tsize;
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if (paramelts[arg]->isPrimitive())
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tsize = paramelts[arg]->size();
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else
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tsize = sizeof (jobject);
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// Copy appropriate bits from the jvalue into the ffi array.
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// FIXME: we could do this copying all in one loop, above, by
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// over-allocating a bit.
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values[i] = p;
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memcpy (p, &args[arg], tsize);
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p += tsize;
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}
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// FIXME: initialize class here.
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using namespace java::lang;
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using namespace java::lang::reflect;
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Throwable *ex = NULL;
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try
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{
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ffi_call (&cif, (void (*) (...)) meth->ncode, result, values);
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}
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catch (Throwable *ex2)
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{
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// FIXME: this is wrong for JNI. But if we just return the
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// exception, then the non-JNI cases won't be able to
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// distinguish it from exceptions we might generate ourselves.
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// Sigh.
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ex = new InvocationTargetException (ex2);
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}
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if (is_constructor)
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result->l = obj;
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return ex;
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}
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// This is another version of _Jv_CallAnyMethodA, but this one does
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// more checking and is used by the reflection (and not JNI) code.
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jobject
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_Jv_CallAnyMethodA (jobject obj,
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jclass return_type,
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jmethodID meth,
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jboolean is_constructor,
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JArray<jclass> *parameter_types,
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jobjectArray args)
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{
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// FIXME: access checks.
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if (parameter_types->length != args->length)
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JvThrow (new java::lang::IllegalArgumentException);
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int param_count = parameter_types->length;
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jclass *paramelts = elements (parameter_types);
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jobject *argelts = elements (args);
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jvalue argvals[param_count];
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#define COPY(Where, What, Type) \
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do { \
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Type val = (What); \
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memcpy ((Where), &val, sizeof (Type)); \
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} while (0)
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for (int i = 0; i < param_count; ++i)
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{
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jclass k = argelts[i] ? argelts[i]->getClass() : NULL;
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if (paramelts[i]->isPrimitive())
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{
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if (! argelts[i]
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|| ! k
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|| ! can_widen (k, paramelts[i]))
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JvThrow (new java::lang::IllegalArgumentException);
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}
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else
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{
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if (argelts[i] && ! paramelts[i]->isAssignableFrom (k))
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JvThrow (new java::lang::IllegalArgumentException);
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}
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java::lang::Number *num = (java::lang::Number *) argelts[i];
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if (paramelts[i] == JvPrimClass (byte))
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COPY (&argvals[i], num->byteValue(), jbyte);
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else if (paramelts[i] == JvPrimClass (short))
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COPY (&argvals[i], num->shortValue(), jshort);
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else if (paramelts[i] == JvPrimClass (int))
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COPY (&argvals[i], num->intValue(), jint);
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else if (paramelts[i] == JvPrimClass (long))
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COPY (&argvals[i], num->longValue(), jlong);
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else if (paramelts[i] == JvPrimClass (float))
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COPY (&argvals[i], num->floatValue(), jfloat);
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else if (paramelts[i] == JvPrimClass (double))
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COPY (&argvals[i], num->doubleValue(), jdouble);
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else if (paramelts[i] == JvPrimClass (boolean))
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COPY (&argvals[i],
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((java::lang::Boolean *) argelts[i])->booleanValue(),
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jboolean);
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else if (paramelts[i] == JvPrimClass (char))
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COPY (&argvals[i],
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((java::lang::Character *) argelts[i])->charValue(),
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jchar);
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else
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{
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JvAssert (! paramelts[i]->isPrimitive());
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COPY (&argvals[i], argelts[i], jobject);
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}
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}
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jvalue ret_value;
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java::lang::Throwable *ex = _Jv_CallAnyMethodA (obj,
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return_type,
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meth,
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is_constructor,
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parameter_types,
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argvals,
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&ret_value);
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if (ex)
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JvThrow (ex);
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jobject r;
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#define VAL(Wrapper, Field) (new Wrapper (ret_value.Field))
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if (is_constructor)
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r = ret_value.l;
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else if (return_type == JvPrimClass (byte))
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r = VAL (java::lang::Byte, b);
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else if (return_type == JvPrimClass (short))
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r = VAL (java::lang::Short, s);
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else if (return_type == JvPrimClass (int))
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r = VAL (java::lang::Integer, i);
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else if (return_type == JvPrimClass (long))
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r = VAL (java::lang::Long, j);
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else if (return_type == JvPrimClass (float))
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r = VAL (java::lang::Float, f);
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else if (return_type == JvPrimClass (double))
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r = VAL (java::lang::Double, d);
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else if (return_type == JvPrimClass (boolean))
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r = VAL (java::lang::Boolean, z);
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else if (return_type == JvPrimClass (char))
|
|
r = VAL (java::lang::Character, c);
|
|
else if (return_type == JvPrimClass (void))
|
|
r = NULL;
|
|
else
|
|
{
|
|
JvAssert (return_type == NULL || ! return_type->isPrimitive());
|
|
r = ret_value.l;
|
|
}
|
|
|
|
return r;
|
|
}
|