1 /*
2 * Copyright (c) 1998, 2010, 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 #ifndef CPU_X86_VM_JNITYPES_X86_HPP
26 #define CPU_X86_VM_JNITYPES_X86_HPP
27
28 #include "memory/allocation.hpp"
29 #include "oops/oop.hpp"
30 #include "prims/jni.h"
31
32 // This file holds platform-dependent routines used to write primitive jni
33 // types to the array of arguments passed into JavaCalls::call
34
35 class JNITypes : AllStatic {
36 // These functions write a java primitive type (in native format)
37 // to a java stack slot array to be passed as an argument to JavaCalls:calls.
38 // I.e., they are functionally 'push' operations if they have a 'pos'
39 // formal parameter. Note that jlong's and jdouble's are written
40 // _in reverse_ of the order in which they appear in the interpreter
41 // stack. This is because call stubs (see stubGenerator_sparc.cpp)
42 // reverse the argument list constructed by JavaCallArguments (see
43 // javaCalls.hpp).
44
45 private:
46
47 #ifndef AMD64
48 // 32bit Helper routines.
49 static inline void put_int2r(jint *from, intptr_t *to) { *(jint *)(to++) = from[1];
50 *(jint *)(to ) = from[0]; }
51 static inline void put_int2r(jint *from, intptr_t *to, int& pos) { put_int2r(from, to + pos); pos += 2; }
52 #endif // AMD64
53
54 public:
55 // Ints are stored in native format in one JavaCallArgument slot at *to.
56 static inline void put_int(jint from, intptr_t *to) { *(jint *)(to + 0 ) = from; }
57 static inline void put_int(jint from, intptr_t *to, int& pos) { *(jint *)(to + pos++) = from; }
58 static inline void put_int(jint *from, intptr_t *to, int& pos) { *(jint *)(to + pos++) = *from; }
59
60 #ifdef AMD64
61 // Longs are stored in native format in one JavaCallArgument slot at
62 // *(to+1).
63 static inline void put_long(jlong from, intptr_t *to) {
64 *(jlong*) (to + 1) = from;
65 }
66
67 static inline void put_long(jlong from, intptr_t *to, int& pos) {
68 *(jlong*) (to + 1 + pos) = from;
69 pos += 2;
70 }
71
72 static inline void put_long(jlong *from, intptr_t *to, int& pos) {
73 *(jlong*) (to + 1 + pos) = *from;
74 pos += 2;
75 }
76 #else
77 // Longs are stored in big-endian word format in two JavaCallArgument slots at *to.
78 // The high half is in *to and the low half in *(to+1).
79 static inline void put_long(jlong from, intptr_t *to) { put_int2r((jint *)&from, to); }
80 static inline void put_long(jlong from, intptr_t *to, int& pos) { put_int2r((jint *)&from, to, pos); }
81 static inline void put_long(jlong *from, intptr_t *to, int& pos) { put_int2r((jint *) from, to, pos); }
82 #endif // AMD64
83
84 // Oops are stored in native format in one JavaCallArgument slot at *to.
85 static inline void put_obj(oop from, intptr_t *to) { *(oop *)(to + 0 ) = from; }
86 static inline void put_obj(oop from, intptr_t *to, int& pos) { *(oop *)(to + pos++) = from; }
87 static inline void put_obj(oop *from, intptr_t *to, int& pos) { *(oop *)(to + pos++) = *from; }
88
89 // Floats are stored in native format in one JavaCallArgument slot at *to.
90 static inline void put_float(jfloat from, intptr_t *to) { *(jfloat *)(to + 0 ) = from; }
91 static inline void put_float(jfloat from, intptr_t *to, int& pos) { *(jfloat *)(to + pos++) = from; }
92 static inline void put_float(jfloat *from, intptr_t *to, int& pos) { *(jfloat *)(to + pos++) = *from; }
93
94 #undef _JNI_SLOT_OFFSET
95 #ifdef AMD64
96 #define _JNI_SLOT_OFFSET 1
97 // Doubles are stored in native word format in one JavaCallArgument
98 // slot at *(to+1).
99 static inline void put_double(jdouble from, intptr_t *to) {
100 *(jdouble*) (to + 1) = from;
101 }
102
103 static inline void put_double(jdouble from, intptr_t *to, int& pos) {
104 *(jdouble*) (to + 1 + pos) = from;
105 pos += 2;
106 }
107
108 static inline void put_double(jdouble *from, intptr_t *to, int& pos) {
109 *(jdouble*) (to + 1 + pos) = *from;
110 pos += 2;
111 }
112 #else
113 #define _JNI_SLOT_OFFSET 0
114 // Doubles are stored in big-endian word format in two JavaCallArgument slots at *to.
115 // The high half is in *to and the low half in *(to+1).
116 static inline void put_double(jdouble from, intptr_t *to) { put_int2r((jint *)&from, to); }
117 static inline void put_double(jdouble from, intptr_t *to, int& pos) { put_int2r((jint *)&from, to, pos); }
118 static inline void put_double(jdouble *from, intptr_t *to, int& pos) { put_int2r((jint *) from, to, pos); }
119 #endif // AMD64
120
121
122 // The get_xxx routines, on the other hand, actually _do_ fetch
123 // java primitive types from the interpreter stack.
124 // No need to worry about alignment on Intel.
125 static inline jint get_int (intptr_t *from) { return *(jint *) from; }
126 static inline jlong get_long (intptr_t *from) { return *(jlong *) (from + _JNI_SLOT_OFFSET); }
127 static inline oop get_obj (intptr_t *from) { return *(oop *) from; }
128 static inline jfloat get_float (intptr_t *from) { return *(jfloat *) from; }
129 static inline jdouble get_double(intptr_t *from) { return *(jdouble *)(from + _JNI_SLOT_OFFSET); }
130 #undef _JNI_SLOT_OFFSET
131 };
132
133 #endif // CPU_X86_VM_JNITYPES_X86_HPP