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e98a2d6e | 1 | /* |
0235b0db | 2 | * SPDX-License-Identifier: MIT |
e98a2d6e | 3 | * |
0235b0db | 4 | * Copyright 2013 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
e98a2d6e | 5 | * |
0235b0db | 6 | * Common Trace Format Object Stack. |
e98a2d6e PP |
7 | */ |
8 | ||
c802cacb SM |
9 | #include <stdlib.h> |
10 | ||
0746848c | 11 | #define BT_LOG_OUTPUT_LEVEL ctf_plugin_metadata_log_level |
4164020e | 12 | #define BT_LOG_TAG "PLUGIN/CTF/META/OBJSTACK" |
087cd0f5 | 13 | #include "logging.hpp" |
52567b11 | 14 | |
c802cacb | 15 | #include "common/align.h" |
578e048b | 16 | #include "common/list.h" |
91d81473 | 17 | #include "common/macros.h" |
c802cacb SM |
18 | |
19 | #include "objstack.hpp" | |
e98a2d6e | 20 | |
4164020e SM |
21 | #define OBJSTACK_ALIGN 8 /* Object stack alignment */ |
22 | #define OBJSTACK_INIT_LEN 128 | |
23 | #define OBJSTACK_POISON 0xcc | |
e98a2d6e | 24 | |
4164020e SM |
25 | struct objstack |
26 | { | |
27 | struct bt_list_head head; /* list of struct objstack_node */ | |
e98a2d6e PP |
28 | }; |
29 | ||
4164020e SM |
30 | struct objstack_node |
31 | { | |
32 | struct bt_list_head node; | |
33 | size_t len; | |
34 | size_t used_len; | |
35 | char __attribute__((aligned(OBJSTACK_ALIGN))) data[]; | |
e98a2d6e PP |
36 | }; |
37 | ||
e98a2d6e PP |
38 | struct objstack *objstack_create(void) |
39 | { | |
4164020e SM |
40 | struct objstack *objstack; |
41 | struct objstack_node *node; | |
42 | ||
43 | objstack = (struct objstack *) calloc(1, sizeof(*objstack)); | |
44 | if (!objstack) { | |
45 | BT_LOGE_STR("Failed to allocate one object stack."); | |
46 | return NULL; | |
47 | } | |
48 | node = (objstack_node *) calloc(sizeof(struct objstack_node) + OBJSTACK_INIT_LEN, sizeof(char)); | |
49 | if (!node) { | |
50 | BT_LOGE_STR("Failed to allocate one object stack node."); | |
51 | free(objstack); | |
52 | return NULL; | |
53 | } | |
54 | BT_INIT_LIST_HEAD(&objstack->head); | |
55 | bt_list_add_tail(&node->node, &objstack->head); | |
56 | node->len = OBJSTACK_INIT_LEN; | |
57 | return objstack; | |
e98a2d6e PP |
58 | } |
59 | ||
4164020e | 60 | static void objstack_node_free(struct objstack_node *node) |
e98a2d6e | 61 | { |
4164020e SM |
62 | size_t offset, len; |
63 | char *p; | |
64 | ||
65 | if (!node) | |
66 | return; | |
67 | p = (char *) node; | |
68 | len = sizeof(*node) + node->len; | |
69 | for (offset = 0; offset < len; offset++) | |
70 | p[offset] = OBJSTACK_POISON; | |
71 | free(node); | |
e98a2d6e PP |
72 | } |
73 | ||
e98a2d6e PP |
74 | void objstack_destroy(struct objstack *objstack) |
75 | { | |
4164020e SM |
76 | struct objstack_node *node, *p; |
77 | ||
78 | if (!objstack) | |
79 | return; | |
80 | bt_list_for_each_entry_safe (node, p, &objstack->head, node) { | |
81 | bt_list_del(&node->node); | |
82 | objstack_node_free(node); | |
83 | } | |
84 | free(objstack); | |
e98a2d6e PP |
85 | } |
86 | ||
4164020e | 87 | static struct objstack_node *objstack_append_node(struct objstack *objstack) |
e98a2d6e | 88 | { |
4164020e SM |
89 | struct objstack_node *last_node, *new_node; |
90 | ||
91 | /* Get last node */ | |
92 | last_node = bt_list_entry(objstack->head.prev, struct objstack_node, node); | |
93 | ||
94 | /* Allocate new node with double of size of last node */ | |
95 | new_node = (objstack_node *) calloc(sizeof(struct objstack_node) + (last_node->len << 1), | |
96 | sizeof(char)); | |
97 | if (!new_node) { | |
98 | BT_LOGE_STR("Failed to allocate one object stack node."); | |
99 | return NULL; | |
100 | } | |
101 | bt_list_add_tail(&new_node->node, &objstack->head); | |
102 | new_node->len = last_node->len << 1; | |
103 | return new_node; | |
e98a2d6e PP |
104 | } |
105 | ||
e98a2d6e PP |
106 | void *objstack_alloc(struct objstack *objstack, size_t len) |
107 | { | |
4164020e SM |
108 | struct objstack_node *last_node; |
109 | void *p; | |
110 | ||
111 | len = BT_ALIGN(len, OBJSTACK_ALIGN); | |
112 | ||
113 | /* Get last node */ | |
114 | last_node = bt_list_entry(objstack->head.prev, struct objstack_node, node); | |
115 | while (last_node->len - last_node->used_len < len) { | |
116 | last_node = objstack_append_node(objstack); | |
117 | if (!last_node) { | |
118 | return NULL; | |
119 | } | |
120 | } | |
121 | p = &last_node->data[last_node->used_len]; | |
122 | last_node->used_len += len; | |
123 | return p; | |
e98a2d6e | 124 | } |