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