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1 /*
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2 * Copyright 1998-2002 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // This file holds platform-dependent routines used to write primitive jni
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26 // types to the array of arguments passed into JavaCalls::call
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27
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28 class JNITypes : AllStatic {
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29 // These functions write a java primitive type (in native format)
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30 // to a java stack slot array to be passed as an argument to JavaCalls:calls.
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31 // I.e., they are functionally 'push' operations if they have a 'pos'
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32 // formal parameter. Note that jlong's and jdouble's are written
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33 // _in reverse_ of the order in which they appear in the interpreter
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34 // stack. This is because call stubs (see stubGenerator_sparc.cpp)
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35 // reverse the argument list constructed by JavaCallArguments (see
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36 // javaCalls.hpp).
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37
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38 private:
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39 // Helper routines.
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40 static inline void put_int2 (jint *from, jint *to) { to[0] = from[0]; to[1] = from[1]; }
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41 static inline void put_int2 (jint *from, jint *to, int& pos) { put_int2 (from, (jint *)((intptr_t *)to + pos)); pos += 2; }
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42 static inline void put_int2r(jint *from, jint *to) { to[0] = from[1]; to[1] = from[0]; }
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43 static inline void put_int2r(jint *from, jint *to, int& pos) { put_int2r(from, (jint *)((intptr_t *)to + pos)); pos += 2; }
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44
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45 public:
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46 // Ints are stored in native format in one JavaCallArgument slot at *to.
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47 static inline void put_int(jint from, intptr_t *to) { *(jint *)(to + 0 ) = from; }
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48 static inline void put_int(jint from, intptr_t *to, int& pos) { *(jint *)(to + pos++) = from; }
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49 static inline void put_int(jint *from, intptr_t *to, int& pos) { *(jint *)(to + pos++) = *from; }
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50
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51 #ifdef _LP64
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52 // Longs are stored in native format in one JavaCallArgument slot at *(to+1).
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53 static inline void put_long(jlong from, intptr_t *to) { *(jlong *)(to + 1 + 0) = from; }
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54 static inline void put_long(jlong from, intptr_t *to, int& pos) { *(jlong *)(to + 1 + pos) = from; pos += 2; }
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55 static inline void put_long(jlong *from, intptr_t *to, int& pos) { *(jlong *)(to + 1 + pos) = *from; pos += 2; }
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56 #else
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57 // Longs are stored in reversed native word format in two JavaCallArgument slots at *to.
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58 // The high half is in *(to+1) and the low half in *to.
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59 static inline void put_long(jlong from, intptr_t *to) { put_int2r((jint *)&from, (jint *)to); }
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60 static inline void put_long(jlong from, intptr_t *to, int& pos) { put_int2r((jint *)&from, (jint *)to, pos); }
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61 static inline void put_long(jlong *from, intptr_t *to, int& pos) { put_int2r((jint *) from, (jint *)to, pos); }
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62 #endif
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63
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64 // Oops are stored in native format in one JavaCallArgument slot at *to.
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65 static inline void put_obj(oop from, intptr_t *to) { *(oop *)(to + 0 ) = from; }
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66 static inline void put_obj(oop from, intptr_t *to, int& pos) { *(oop *)(to + pos++) = from; }
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67 static inline void put_obj(oop *from, intptr_t *to, int& pos) { *(oop *)(to + pos++) = *from; }
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68
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69 // Floats are stored in native format in one JavaCallArgument slot at *to.
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70 static inline void put_float(jfloat from, intptr_t *to) { *(jfloat *)(to + 0 ) = from; }
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71 static inline void put_float(jfloat from, intptr_t *to, int& pos) { *(jfloat *)(to + pos++) = from; }
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72 static inline void put_float(jfloat *from, intptr_t *to, int& pos) { *(jfloat *)(to + pos++) = *from; }
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73
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74 #ifdef _LP64
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75 // Doubles are stored in native word format in one JavaCallArgument slot at *(to+1).
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76 static inline void put_double(jdouble from, intptr_t *to) { *(jdouble *)(to + 1 + 0) = from; }
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77 static inline void put_double(jdouble from, intptr_t *to, int& pos) { *(jdouble *)(to + 1 + pos) = from; pos += 2; }
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78 static inline void put_double(jdouble *from, intptr_t *to, int& pos) { *(jdouble *)(to + 1 + pos) = *from; pos += 2; }
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79 #else
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80 // Doubles are stored in reversed native word format in two JavaCallArgument slots at *to.
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81 static inline void put_double(jdouble from, intptr_t *to) { put_int2r((jint *)&from, (jint *)to); }
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82 static inline void put_double(jdouble from, intptr_t *to, int& pos) { put_int2r((jint *)&from, (jint *)to, pos); }
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83 static inline void put_double(jdouble *from, intptr_t *to, int& pos) { put_int2r((jint *) from, (jint *)to, pos); }
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84 #endif
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85
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86 // The get_xxx routines, on the other hand, actually _do_ fetch
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87 // java primitive types from the interpreter stack.
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88 static inline jint get_int(intptr_t *from) { return *(jint *)from; }
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89
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90 #ifdef _LP64
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91 static inline jlong get_long(intptr_t *from) { return *(jlong *)from; }
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92 #else
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93 static inline jlong get_long(intptr_t *from) { return ((jlong)(*( signed int *)((jint *)from )) << 32) |
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94 ((jlong)(*(unsigned int *)((jint *)from + 1)) << 0); }
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95 #endif
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96
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97 static inline oop get_obj(intptr_t *from) { return *(oop *)from; }
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98 static inline jfloat get_float(intptr_t *from) { return *(jfloat *)from; }
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99
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100 #ifdef _LP64
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101 static inline jdouble get_double(intptr_t *from) { return *(jdouble *)from; }
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102 #else
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103 static inline jdouble get_double(intptr_t *from) { jlong jl = ((jlong)(*( signed int *)((jint *)from )) << 32) |
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104 ((jlong)(*(unsigned int *)((jint *)from + 1)) << 0);
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105 return *(jdouble *)&jl; }
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106 #endif
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107
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108 };
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