1 /*
2 * Copyright (c) 1998, 2003, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // This file holds platform-dependent routines used to write primitive jni
26 // types to the array of arguments passed into JavaCalls::call
27
28 class JNITypes : AllStatic {
29 // These functions write a java primitive type (in native format)
30 // to a java stack slot array to be passed as an argument to JavaCalls:calls.
31 // I.e., they are functionally 'push' operations if they have a 'pos'
32 // formal parameter. Note that jlong's and jdouble's are written
33 // _in reverse_ of the order in which they appear in the interpreter
34 // stack. This is because call stubs (see stubGenerator_sparc.cpp)
35 // reverse the argument list constructed by JavaCallArguments (see
36 // javaCalls.hpp).
37
38 private:
39
40 #ifndef AMD64
41 // 32bit Helper routines.
42 static inline void put_int2r(jint *from, intptr_t *to) { *(jint *)(to++) = from[1];
43 *(jint *)(to ) = from[0]; }
44 static inline void put_int2r(jint *from, intptr_t *to, int& pos) { put_int2r(from, to + pos); pos += 2; }
45 #endif // AMD64
46
47 public:
48 // Ints are stored in native format in one JavaCallArgument slot at *to.
49 static inline void put_int(jint from, intptr_t *to) { *(jint *)(to + 0 ) = from; }
50 static inline void put_int(jint from, intptr_t *to, int& pos) { *(jint *)(to + pos++) = from; }
51 static inline void put_int(jint *from, intptr_t *to, int& pos) { *(jint *)(to + pos++) = *from; }
52
53 #ifdef AMD64
54 // Longs are stored in native format in one JavaCallArgument slot at
55 // *(to+1).
56 static inline void put_long(jlong from, intptr_t *to) {
57 *(jlong*) (to + 1) = from;
58 }
59
60 static inline void put_long(jlong from, intptr_t *to, int& pos) {
61 *(jlong*) (to + 1 + pos) = from;
62 pos += 2;
63 }
64
65 static inline void put_long(jlong *from, intptr_t *to, int& pos) {
66 *(jlong*) (to + 1 + pos) = *from;
67 pos += 2;
68 }
69 #else
70 // Longs are stored in big-endian word format in two JavaCallArgument slots at *to.
71 // The high half is in *to and the low half in *(to+1).
72 static inline void put_long(jlong from, intptr_t *to) { put_int2r((jint *)&from, to); }
73 static inline void put_long(jlong from, intptr_t *to, int& pos) { put_int2r((jint *)&from, to, pos); }
74 static inline void put_long(jlong *from, intptr_t *to, int& pos) { put_int2r((jint *) from, to, pos); }
75 #endif // AMD64
76
77 // Oops are stored in native format in one JavaCallArgument slot at *to.
78 static inline void put_obj(oop from, intptr_t *to) { *(oop *)(to + 0 ) = from; }
79 static inline void put_obj(oop from, intptr_t *to, int& pos) { *(oop *)(to + pos++) = from; }
80 static inline void put_obj(oop *from, intptr_t *to, int& pos) { *(oop *)(to + pos++) = *from; }
81
82 // Floats are stored in native format in one JavaCallArgument slot at *to.
83 static inline void put_float(jfloat from, intptr_t *to) { *(jfloat *)(to + 0 ) = from; }
84 static inline void put_float(jfloat from, intptr_t *to, int& pos) { *(jfloat *)(to + pos++) = from; }
85 static inline void put_float(jfloat *from, intptr_t *to, int& pos) { *(jfloat *)(to + pos++) = *from; }
86
87 #undef _JNI_SLOT_OFFSET
88 #ifdef AMD64
89 #define _JNI_SLOT_OFFSET 1
90 // Doubles are stored in native word format in one JavaCallArgument
91 // slot at *(to+1).
92 static inline void put_double(jdouble from, intptr_t *to) {
93 *(jdouble*) (to + 1) = from;
94 }
95
96 static inline void put_double(jdouble from, intptr_t *to, int& pos) {
97 *(jdouble*) (to + 1 + pos) = from;
98 pos += 2;
99 }
100
101 static inline void put_double(jdouble *from, intptr_t *to, int& pos) {
102 *(jdouble*) (to + 1 + pos) = *from;
103 pos += 2;
104 }
105 #else
106 #define _JNI_SLOT_OFFSET 0
107 // Doubles are stored in big-endian word format in two JavaCallArgument slots at *to.
108 // The high half is in *to and the low half in *(to+1).
109 static inline void put_double(jdouble from, intptr_t *to) { put_int2r((jint *)&from, to); }
110 static inline void put_double(jdouble from, intptr_t *to, int& pos) { put_int2r((jint *)&from, to, pos); }
111 static inline void put_double(jdouble *from, intptr_t *to, int& pos) { put_int2r((jint *) from, to, pos); }
112 #endif // AMD64
113
114
115 // The get_xxx routines, on the other hand, actually _do_ fetch
116 // java primitive types from the interpreter stack.
117 // No need to worry about alignment on Intel.
118 static inline jint get_int (intptr_t *from) { return *(jint *) from; }
119 static inline jlong get_long (intptr_t *from) { return *(jlong *) (from + _JNI_SLOT_OFFSET); }
120 static inline oop get_obj (intptr_t *from) { return *(oop *) from; }
121 static inline jfloat get_float (intptr_t *from) { return *(jfloat *) from; }
122 static inline jdouble get_double(intptr_t *from) { return *(jdouble *)(from + _JNI_SLOT_OFFSET); }
123 #undef _JNI_SLOT_OFFSET
124 };