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annotate dyncallback/dyncall_callback_x64.c @ 546:ba70fb631bea

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x64: * support for non-standard aggr-by-value packing (#pragma pack, etc.) * callbacks: handling callconv prefixes in signature
author Tassilo Philipp
date Tue, 31 May 2022 19:29:34 +0200
parents 71c884e610f0
children
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1 /*
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2
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3 Package: dyncall
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4 Library: dyncallback
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5 File: dyncallback/dyncall_callback_x64.c
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6 Description: Callback - Implementation for x64
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7 License:
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8
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9 Copyright (c) 2007-2022 Daniel Adler <dadler@uni-goettingen.de>,
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10 Tassilo Philipp <tphilipp@potion-studios.com>
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11
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12 Permission to use, copy, modify, and distribute this software for any
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13 purpose with or without fee is hereby granted, provided that the above
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14 copyright notice and this permission notice appear in all copies.
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15
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16 THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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17 WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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18 MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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19 ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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20 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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21 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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22 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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23
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24 */
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25
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26
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27 #include "dyncall_callback.h"
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28 #include "dyncall_alloc_wx.h"
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29 #include "dyncall_aggregate.h"
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30 #include "dyncall_thunk.h"
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32
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33 /* Callback symbol. */
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34 extern void dcCallback_x64_sysv();
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35 extern void dcCallback_x64_win64();
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36
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37 struct DCCallback
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38 {
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39 DCThunk thunk; /* offset 0, size 24 */
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40 DCCallbackHandler* handler; /* offset 24 */
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41 void* userdata; /* offset 32 */
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42 DCint aggr_return_register; /* offset 40 */
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43 DCint pad; /* offset 44 */
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44 DCaggr *const * aggrs; /* offset 48 */
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45 };
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48 void dcbInitCallback2(DCCallback* pcb, const DCsigchar* signature, DCCallbackHandler* handler, void* userdata, DCaggr *const * aggrs)
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49 {
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50 const DCsigchar *ch = signature;
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51 int mode = DC_CALL_C_DEFAULT;
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52 DCint num_aggrs = 0;
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53
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54 pcb->handler = handler;
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55 pcb->userdata = userdata;
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56 pcb->aggrs = NULL;
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57 pcb->aggr_return_register = -2; /* default, = no aggr as ret value */
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58
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59 if(*ch == DC_SIGCHAR_CC_PREFIX)
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60 {
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61 mode = dcGetModeFromCCSigChar(ch[1]);
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62 ch += 2;
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63 }
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65 while(*ch)
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66 num_aggrs += (*(ch++) == DC_SIGCHAR_AGGREGATE);
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67
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68 if(num_aggrs)
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69 {
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70 pcb->aggrs = aggrs;
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71
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72 if (ch != signature && *(ch - 1) == DC_SIGCHAR_AGGREGATE) {
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73 const DCaggr *ag = pcb->aggrs[num_aggrs - 1];
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74
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75 #if defined(DC_UNIX)
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76 if (!ag || (ag->sysv_classes[0] == SYSVC_MEMORY)) {
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77 #else
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78 if (mode == DC_CALL_C_DEFAULT_THIS) {
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79 pcb->aggr_return_register = 1;
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80 } else if (!ag || ag->size > 8 || /*not a power of 2?*/(ag->size & (ag->size - 1))) {
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81 #endif
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82 /* we need to "return" this aggr as a hidden pointer (first arg) */
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83 pcb->aggr_return_register = 0;
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84 } else {
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85 pcb->aggr_return_register = -1; /* small aggr, returned in register */
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86 }
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87 }
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88 }
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89 }
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91
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92 DCCallback* dcbNewCallback2(const DCsigchar* signature, DCCallbackHandler* handler, void* userdata, DCaggr *const * aggrs)
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93 {
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94 int err;
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95 DCCallback* pcb;
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96 err = dcAllocWX(sizeof(DCCallback), (void**) &pcb);
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97 if(err)
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98 return NULL;
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99
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100 dcbInitCallback2(pcb, signature, handler, userdata, aggrs);
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101
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102 #if defined (DC__OS_Win64)
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103 dcbInitThunk(&pcb->thunk, dcCallback_x64_win64);
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104 #else
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105 dcbInitThunk(&pcb->thunk, dcCallback_x64_sysv);
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106 #endif
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107
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108 err = dcInitExecWX(pcb, sizeof(DCCallback));
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109 if(err) {
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110 dcFreeWX(pcb, sizeof(DCCallback));
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111 return NULL;
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112 }
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113
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114 return pcb;
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115 }
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116