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e6938018 PP |
1 | /* |
2 | * SPDX-License-Identifier: MIT | |
3 | * | |
4 | * Copyright 2020 Philippe Proulx <pproulx@efficios.com> | |
5 | */ | |
6 | ||
e6938018 | 7 | #include <glib.h> |
c802cacb | 8 | #include <inttypes.h> |
e6938018 PP |
9 | #include <stdint.h> |
10 | #include <string.h> | |
c802cacb SM |
11 | |
12 | #include <babeltrace2/babeltrace.h> | |
13 | ||
14 | #include "common/assert.h" | |
15 | #include "common/macros.h" | |
e6938018 | 16 | |
087cd0f5 | 17 | #include "ctf-meta-visitors.hpp" |
e6938018 | 18 | |
4164020e | 19 | static inline int set_alignments(struct ctf_field_class *fc) |
e6938018 | 20 | { |
4164020e SM |
21 | int ret = 0; |
22 | uint64_t i; | |
23 | ||
24 | if (!fc) { | |
25 | goto end; | |
26 | } | |
27 | ||
28 | switch (fc->type) { | |
29 | case CTF_FIELD_CLASS_TYPE_STRUCT: | |
30 | { | |
31 | struct ctf_field_class_struct *struct_fc = ctf_field_class_as_struct(fc); | |
32 | ||
33 | for (i = 0; i < struct_fc->members->len; i++) { | |
34 | struct ctf_named_field_class *named_fc = | |
35 | ctf_field_class_struct_borrow_member_by_index(struct_fc, i); | |
36 | ||
37 | ret = set_alignments(named_fc->fc); | |
38 | if (ret) { | |
39 | goto end; | |
40 | } | |
41 | ||
42 | if (named_fc->fc->alignment > fc->alignment) { | |
43 | fc->alignment = named_fc->fc->alignment; | |
44 | } | |
45 | } | |
46 | ||
47 | break; | |
48 | } | |
49 | case CTF_FIELD_CLASS_TYPE_VARIANT: | |
50 | { | |
51 | struct ctf_field_class_variant *var_fc = ctf_field_class_as_variant(fc); | |
52 | ||
53 | for (i = 0; i < var_fc->options->len; i++) { | |
54 | struct ctf_named_field_class *named_fc = | |
55 | ctf_field_class_variant_borrow_option_by_index(var_fc, i); | |
56 | ||
57 | ret = set_alignments(named_fc->fc); | |
58 | if (ret) { | |
59 | goto end; | |
60 | } | |
61 | } | |
62 | ||
63 | break; | |
64 | } | |
65 | case CTF_FIELD_CLASS_TYPE_ARRAY: | |
66 | case CTF_FIELD_CLASS_TYPE_SEQUENCE: | |
67 | { | |
68 | struct ctf_field_class_array_base *array_fc = ctf_field_class_as_array_base(fc); | |
69 | ||
70 | ret = set_alignments(array_fc->elem_fc); | |
71 | if (ret) { | |
72 | goto end; | |
73 | } | |
74 | ||
75 | /* | |
76 | * Use the alignment of the array/sequence field class's | |
77 | * element FC as its own alignment. | |
78 | * | |
79 | * This is especially important when the array/sequence | |
80 | * field's effective length is zero: as per CTF 1.8, the | |
81 | * stream data decoding process still needs to align the | |
82 | * cursor using the element's alignment [1]: | |
83 | * | |
84 | * > Arrays are always aligned on their element | |
85 | * > alignment requirement. | |
86 | * | |
87 | * For example: | |
88 | * | |
89 | * struct { | |
90 | * integer { size = 8; } a; | |
91 | * integer { size = 8; align = 16; } b[0]; | |
92 | * integer { size = 8; } c; | |
93 | * }; | |
94 | * | |
95 | * When using this to decode the bytes 1, 2, and 3, then | |
96 | * the decoded values are: | |
97 | * | |
98 | * `a`: 1 | |
99 | * `b`: [] | |
100 | * `c`: 3 | |
101 | * | |
102 | * [1]: https://diamon.org/ctf/#spec4.2.3 | |
103 | */ | |
104 | array_fc->base.alignment = array_fc->elem_fc->alignment; | |
105 | break; | |
106 | } | |
107 | default: | |
108 | break; | |
109 | } | |
e6938018 PP |
110 | |
111 | end: | |
4164020e | 112 | return ret; |
e6938018 PP |
113 | } |
114 | ||
4164020e | 115 | int ctf_trace_class_update_alignments(struct ctf_trace_class *ctf_tc) |
e6938018 | 116 | { |
4164020e SM |
117 | int ret = 0; |
118 | uint64_t i; | |
119 | ||
120 | if (!ctf_tc->is_translated) { | |
121 | ret = set_alignments(ctf_tc->packet_header_fc); | |
122 | if (ret) { | |
123 | goto end; | |
124 | } | |
125 | } | |
126 | ||
127 | for (i = 0; i < ctf_tc->stream_classes->len; i++) { | |
128 | ctf_stream_class *sc = (ctf_stream_class *) ctf_tc->stream_classes->pdata[i]; | |
129 | uint64_t j; | |
130 | ||
131 | if (!sc->is_translated) { | |
132 | ret = set_alignments(sc->packet_context_fc); | |
133 | if (ret) { | |
134 | goto end; | |
135 | } | |
136 | ||
137 | ret = set_alignments(sc->event_header_fc); | |
138 | if (ret) { | |
139 | goto end; | |
140 | } | |
141 | ||
142 | ret = set_alignments(sc->event_common_context_fc); | |
143 | if (ret) { | |
144 | goto end; | |
145 | } | |
146 | } | |
147 | ||
148 | for (j = 0; j < sc->event_classes->len; j++) { | |
149 | struct ctf_event_class *ec = (ctf_event_class *) sc->event_classes->pdata[j]; | |
150 | ||
151 | if (ec->is_translated) { | |
152 | continue; | |
153 | } | |
154 | ||
155 | ret = set_alignments(ec->spec_context_fc); | |
156 | if (ret) { | |
157 | goto end; | |
158 | } | |
159 | ||
160 | ret = set_alignments(ec->payload_fc); | |
161 | if (ret) { | |
162 | goto end; | |
163 | } | |
164 | } | |
165 | } | |
e6938018 PP |
166 | |
167 | end: | |
4164020e | 168 | return ret; |
e6938018 | 169 | } |