1 /*
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   3  * Copyright (c) 2016 SAP SE. All rights reserved.
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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   6  * This code is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 only, as
   8  * published by the Free Software Foundation.
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  10  * This code is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * version 2 for more details (a copy is included in the LICENSE file that
  14  * accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License version
  17  * 2 along with this work; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
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  25 
  26 #ifndef CPU_S390_VM_JNITYPES_S390_HPP
  27 #define CPU_S390_VM_JNITYPES_S390_HPP
  28 
  29 // This file holds platform-dependent routines used to write primitive
  30 // jni types to the array of arguments passed into JavaCalls::call.
  31 
  32 #include "memory/allocation.hpp"
  33 #include "oops/oop.hpp"
  34 #include "prims/jni.h"
  35 
  36 class JNITypes : AllStatic {
  37   // These functions write a java primitive type (in native format) to
  38   // a java stack slot array to be passed as an argument to
  39   // JavaCalls:calls. I.e., they are functionally 'push' operations
  40   // if they have a 'pos' formal parameter. Note that jlongs and
  41   // jdoubles are written _in reverse_ of the order in which they
  42   // appear in the interpreter stack. This is because call stubs (see
  43   // stubGenerator_s390.cpp) reverse the argument list constructed by
  44   // JavaCallArguments (see javaCalls.hpp).
  45 
  46  public:
  47   // Ints are stored in native format in one JavaCallArgument slot at *to.
  48   static inline void put_int(jint  from, intptr_t *to) {
  49     *(jint*) to = from;
  50   }
  51 
  52   static inline void put_int(jint  from, intptr_t *to, int& pos) {
  53     *(jint*) (to + pos++) = from;
  54   }
  55 
  56   static inline void put_int(jint *from, intptr_t *to, int& pos) {
  57     *(jint*) (to + pos++) = *from;
  58   }
  59 
  60   // Longs are stored in native format in one JavaCallArgument slot at *(to+1).
  61   static inline void put_long(jlong  from, intptr_t *to) {
  62     *(jlong*) (to + 1) = from;
  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 
  70   static inline void put_long(jlong *from, intptr_t *to, int& pos) {
  71     *(jlong*) (to + 1 + pos) = *from;
  72     pos += 2;
  73   }
  74 
  75   // Oops are stored in native format in one JavaCallArgument slot at *to.
  76   static inline void put_obj(oop  from, intptr_t *to) {
  77     *(oop*) to = from;
  78   }
  79 
  80   static inline void put_obj(oop  from, intptr_t *to, int& pos) {
  81     *(oop*) (to + pos++) = from;
  82   }
  83 
  84   static inline void put_obj(oop *from, intptr_t *to, int& pos) {
  85     *(oop*) (to + pos++) = *from;
  86   }
  87 
  88   // Floats are stored in native format in one JavaCallArgument slot at *to.
  89   static inline void put_float(jfloat  from, intptr_t *to) {
  90     *(jfloat*) to = from;
  91   }
  92 
  93   static inline void put_float(jfloat  from, intptr_t *to, int& pos) {
  94     *(jfloat*) (to + pos++) = from;
  95   }
  96 
  97   static inline void put_float(jfloat *from, intptr_t *to, int& pos) {
  98     *(jfloat*) (to + pos++) = *from;
  99   }
 100 
 101   // Doubles are stored in native word format in one JavaCallArgument
 102   // slot at *(to+1).
 103   static inline void put_double(jdouble  from, intptr_t *to) {
 104     *(jdouble*) (to + 1) = from;
 105   }
 106 
 107   static inline void put_double(jdouble  from, intptr_t *to, int& pos) {
 108     *(jdouble*) (to + 1 + pos) = from;
 109     pos += 2;
 110   }
 111 
 112   static inline void put_double(jdouble *from, intptr_t *to, int& pos) {
 113     *(jdouble*) (to + 1 + pos) = *from;
 114     pos += 2;
 115   }
 116 
 117   // The get_xxx routines, on the other hand, actually _do_ fetch
 118   // java primitive types from the interpreter stack.
 119   // No need to worry about alignment on z/Architecture.
 120   static inline jint get_int(intptr_t *from) {
 121     return *(jint*) from;
 122   }
 123 
 124   static inline jlong get_long(intptr_t *from) {
 125     return *(jlong*) (from + 1);
 126   }
 127 
 128   static inline oop get_obj(intptr_t *from) {
 129     return *(oop*) from;
 130   }
 131 
 132   static inline jfloat get_float(intptr_t *from) {
 133     return *(jfloat*) from;
 134   }
 135 
 136   static inline jdouble get_double(intptr_t *from) {
 137     return *(jdouble*) (from + 1);
 138   }
 139 };
 140 
 141 #endif // CPU_S390_VM_JNITYPES_S390_HPP