[lttng-ust.git] / liblttng-ust-java-agent / jni / common / lttng_ust_context.c

/*
 * SPDX-License-Identifier: LGPL-2.1-only
 *
 * Copyright (C) 2016 EfficiOS Inc.
 * Copyright (C) 2016 Alexandre Montplaisir <alexmonthy@efficios.com>
 * Copyright (C) 2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 */

#include "org_lttng_ust_agent_context_LttngContextApi.h"

#include <string.h>
#include <inttypes.h>
#include <lttng/ust-events.h>
#include <lttng/ringbuffer-context.h>
#include <ust-context-provider.h>

#include "ust-helper.h"
#include "lttng_ust_context.h"

enum lttng_ust_jni_type {
	JNI_TYPE_NULL = 0,
	JNI_TYPE_INTEGER = 1,
	JNI_TYPE_LONG = 2,
	JNI_TYPE_DOUBLE = 3,
	JNI_TYPE_FLOAT = 4,
	JNI_TYPE_BYTE = 5,
	JNI_TYPE_SHORT = 6,
	JNI_TYPE_BOOLEAN = 7,
	JNI_TYPE_STRING = 8,
};

struct lttng_ust_jni_ctx_entry {
	int32_t context_name_offset;
	char type;	/* enum lttng_ust_jni_type */
	union {
		int32_t _integer;
		int64_t _long;
		double _double;
		float _float;
		signed char _byte;
		int16_t _short;
		signed char _boolean;
		int32_t _string_offset;
	} value;
} __attribute__((packed));

/* TLS passing context info from JNI to callbacks. */
__thread struct lttng_ust_jni_tls lttng_ust_context_info_tls;

static const char *get_ctx_string_at_offset(int32_t offset)
{
	signed char *ctx_strings_array = lttng_ust_context_info_tls.ctx_strings;

	if (offset < 0 || offset >= lttng_ust_context_info_tls.ctx_strings_len) {
		return NULL;
	}
	return (const char *) (ctx_strings_array + offset);
}

static struct lttng_ust_jni_ctx_entry *lookup_ctx_by_name(const char *ctx_name)
{
	struct lttng_ust_jni_ctx_entry *ctx_entries_array = lttng_ust_context_info_tls.ctx_entries;
	int i, len = lttng_ust_context_info_tls.ctx_entries_len / sizeof(struct lttng_ust_jni_ctx_entry);

	for (i = 0; i < len; i++) {
		int32_t offset = ctx_entries_array[i].context_name_offset;
		const char *string = get_ctx_string_at_offset(offset);

		if (string && strcmp(string, ctx_name) == 0) {
			return &ctx_entries_array[i];
		}
	}
	return NULL;
}

static size_t get_size_cb(struct lttng_ust_ctx_field *field, size_t offset)
{
	struct lttng_ust_jni_ctx_entry *jctx;
	size_t size = 0;
	const char *ctx_name = field->event_field->name;
	enum lttng_ust_jni_type jni_type;


	size += lttng_ust_lib_ring_buffer_align(offset, lttng_ust_rb_alignof(char));
	size += sizeof(char);		/* tag */
	jctx = lookup_ctx_by_name(ctx_name);
	if (!jctx) {
		jni_type = JNI_TYPE_NULL;
	} else {
		jni_type = jctx->type;
	}
	switch (jni_type) {
	case JNI_TYPE_NULL:
		break;
	case JNI_TYPE_INTEGER:
		size += lttng_ust_lib_ring_buffer_align(offset, lttng_ust_rb_alignof(int32_t));
		size += sizeof(int32_t);	/* variant */
		break;
	case JNI_TYPE_LONG:
		size += lttng_ust_lib_ring_buffer_align(offset, lttng_ust_rb_alignof(int64_t));
		size += sizeof(int64_t);	/* variant */
		break;
	case JNI_TYPE_DOUBLE:
		size += lttng_ust_lib_ring_buffer_align(offset, lttng_ust_rb_alignof(double));
		size += sizeof(double);		/* variant */
		break;
	case JNI_TYPE_FLOAT:
		size += lttng_ust_lib_ring_buffer_align(offset, lttng_ust_rb_alignof(float));
		size += sizeof(float);		/* variant */
		break;
	case JNI_TYPE_SHORT:
		size += lttng_ust_lib_ring_buffer_align(offset, lttng_ust_rb_alignof(int16_t));
		size += sizeof(int16_t);	/* variant */
		break;
	case JNI_TYPE_BYTE:		/* Fall-through. */
	case JNI_TYPE_BOOLEAN:
		size += lttng_ust_lib_ring_buffer_align(offset, lttng_ust_rb_alignof(char));
		size += sizeof(char);		/* variant */
		break;
	case JNI_TYPE_STRING:
	{
		/* The value is an offset, the string is in the "strings" array */
		int32_t string_offset = jctx->value._string_offset;
		const char *string = get_ctx_string_at_offset(string_offset);

		if (string) {
			size += strlen(string) + 1;
		}
		break;
	}
	default:
		abort();
	}
	return size;

}

static void record_cb(struct lttng_ust_ctx_field *field,
		 struct lttng_ust_lib_ring_buffer_ctx *ctx,
		 struct lttng_ust_channel_buffer *lttng_chan_buf)
{
	struct lttng_ust_jni_ctx_entry *jctx;
	const char *ctx_name = field->event_field->name;
	enum lttng_ust_jni_type jni_type;
	char sel_char;

	jctx = lookup_ctx_by_name(ctx_name);
	if (!jctx) {
		jni_type = JNI_TYPE_NULL;
	} else {
		jni_type = jctx->type;
	}

	switch (jni_type) {
	case JNI_TYPE_NULL:
		sel_char = LTTNG_UST_DYNAMIC_TYPE_NONE;
		lttng_chan_buf->ops->event_write(ctx, &sel_char, sizeof(sel_char), lttng_ust_rb_alignof(char));
		break;
	case JNI_TYPE_INTEGER:
	{
		int32_t v = jctx->value._integer;

		sel_char = LTTNG_UST_DYNAMIC_TYPE_S32;
		lttng_chan_buf->ops->event_write(ctx, &sel_char, sizeof(sel_char), lttng_ust_rb_alignof(char));
		lttng_chan_buf->ops->event_write(ctx, &v, sizeof(v), lttng_ust_rb_alignof(v));
		break;
	}
	case JNI_TYPE_LONG:
	{
		int64_t v = jctx->value._long;

		sel_char = LTTNG_UST_DYNAMIC_TYPE_S64;
		lttng_chan_buf->ops->event_write(ctx, &sel_char, sizeof(sel_char), lttng_ust_rb_alignof(char));
		lttng_chan_buf->ops->event_write(ctx, &v, sizeof(v), lttng_ust_rb_alignof(v));
		break;
	}
	case JNI_TYPE_DOUBLE:
	{
		double v = jctx->value._double;

		sel_char = LTTNG_UST_DYNAMIC_TYPE_DOUBLE;
		lttng_chan_buf->ops->event_write(ctx, &sel_char, sizeof(sel_char), lttng_ust_rb_alignof(char));
		lttng_chan_buf->ops->event_write(ctx, &v, sizeof(v), lttng_ust_rb_alignof(v));
		break;
	}
	case JNI_TYPE_FLOAT:
	{
		float v = jctx->value._float;

		sel_char = LTTNG_UST_DYNAMIC_TYPE_FLOAT;
		lttng_chan_buf->ops->event_write(ctx, &sel_char, sizeof(sel_char), lttng_ust_rb_alignof(char));
		lttng_chan_buf->ops->event_write(ctx, &v, sizeof(v), lttng_ust_rb_alignof(v));
		break;
	}
	case JNI_TYPE_SHORT:
	{
		int16_t v = jctx->value._short;

		sel_char = LTTNG_UST_DYNAMIC_TYPE_S16;
		lttng_chan_buf->ops->event_write(ctx, &sel_char, sizeof(sel_char), lttng_ust_rb_alignof(char));
		lttng_chan_buf->ops->event_write(ctx, &v, sizeof(v), lttng_ust_rb_alignof(v));
		break;
	}
	case JNI_TYPE_BYTE:
	{
		char v = jctx->value._byte;

		sel_char = LTTNG_UST_DYNAMIC_TYPE_S8;
		lttng_chan_buf->ops->event_write(ctx, &sel_char, sizeof(sel_char), lttng_ust_rb_alignof(char));
		lttng_chan_buf->ops->event_write(ctx, &v, sizeof(v), lttng_ust_rb_alignof(v));
		break;
	}
	case JNI_TYPE_BOOLEAN:
	{
		char v = jctx->value._boolean;

		sel_char = LTTNG_UST_DYNAMIC_TYPE_S8;
		lttng_chan_buf->ops->event_write(ctx, &sel_char, sizeof(sel_char), lttng_ust_rb_alignof(char));
		lttng_chan_buf->ops->event_write(ctx, &v, sizeof(v), lttng_ust_rb_alignof(v));
		break;
	}
	case JNI_TYPE_STRING:
	{
			int32_t offset = jctx->value._string_offset;
			const char *str = get_ctx_string_at_offset(offset);

			if (str) {
				sel_char = LTTNG_UST_DYNAMIC_TYPE_STRING;
			} else {
				sel_char = LTTNG_UST_DYNAMIC_TYPE_NONE;
			}
			lttng_chan_buf->ops->event_write(ctx, &sel_char, sizeof(sel_char), lttng_ust_rb_alignof(char));
			if (str) {
				lttng_chan_buf->ops->event_write(ctx, str, strlen(str) + 1, 1);
			}
			break;
	}
	default:
		abort();
	}
}

static void get_value_cb(struct lttng_ust_ctx_field *field,
		struct lttng_ust_ctx_value *value)
{
	struct lttng_ust_jni_ctx_entry *jctx;
	const char *ctx_name = field->event_field->name;
	enum lttng_ust_jni_type jni_type;

	jctx = lookup_ctx_by_name(ctx_name);
	if (!jctx) {
		jni_type = JNI_TYPE_NULL;
	} else {
		jni_type = jctx->type;
	}

	switch (jni_type) {
	case JNI_TYPE_NULL:
		value->sel = LTTNG_UST_DYNAMIC_TYPE_NONE;
		break;
	case JNI_TYPE_INTEGER:
		value->sel = LTTNG_UST_DYNAMIC_TYPE_S64;
		value->u.s64 = (int64_t) jctx->value._integer;
		break;
	case JNI_TYPE_LONG:
		value->sel = LTTNG_UST_DYNAMIC_TYPE_S64;
		value->u.s64 = jctx->value._long;
		break;
	case JNI_TYPE_DOUBLE:
		value->sel = LTTNG_UST_DYNAMIC_TYPE_DOUBLE;
		value->u.d = jctx->value._double;
		break;
	case JNI_TYPE_FLOAT:
		value->sel = LTTNG_UST_DYNAMIC_TYPE_DOUBLE;
		value->u.d = (double) jctx->value._float;
		break;
	case JNI_TYPE_SHORT:
		value->sel = LTTNG_UST_DYNAMIC_TYPE_S64;
		value->u.s64 = (int64_t) jctx->value._short;
		break;
	case JNI_TYPE_BYTE:
		value->sel = LTTNG_UST_DYNAMIC_TYPE_S64;
		value->u.s64 = (int64_t) jctx->value._byte;
		break;
	case JNI_TYPE_BOOLEAN:
		value->sel = LTTNG_UST_DYNAMIC_TYPE_S64;
		value->u.s64 = (int64_t) jctx->value._boolean;
		break;
	case JNI_TYPE_STRING:
	{
		int32_t offset = jctx->value._string_offset;
		const char *str = get_ctx_string_at_offset(offset);

		if (str) {
			value->sel = LTTNG_UST_DYNAMIC_TYPE_STRING;
			value->u.str = str;
		} else {
			value->sel = LTTNG_UST_DYNAMIC_TYPE_NONE;
		}
		break;
	}
	default:
		abort();
	}
}

/*
 * Register a context provider to UST.
 *
 * Called from the Java side when an application registers a context retriever,
 * so we create and register a corresponding provider on the C side.
 */
JNIEXPORT jlong JNICALL Java_org_lttng_ust_agent_context_LttngContextApi_registerProvider(JNIEnv *env,
						jobject jobj __attribute__((unused)),
						jstring provider_name)
{
	jboolean iscopy;
	const char *provider_name_jstr;
	char *provider_name_cstr;
	struct lttng_ust_context_provider *provider;
	/*
	 * Note: a "jlong" is 8 bytes on all architectures, whereas a
	 * C "long" varies.
	 */
	jlong provider_ref;

	provider_name_jstr = (*env)->GetStringUTFChars(env, provider_name, &iscopy);
	if (!provider_name_jstr) {
		goto error_jstr;
	}
	/* Keep our own copy of the string so UST can use it. */
	provider_name_cstr = strdup(provider_name_jstr);
	(*env)->ReleaseStringUTFChars(env, provider_name, provider_name_jstr);
	if (!provider_name_cstr) {
		goto error_strdup;
	}
	provider = zmalloc(sizeof(*provider));
	if (!provider) {
		goto error_provider;
	}
	provider->struct_size = sizeof(*provider);
	provider->name = provider_name_cstr;
	provider->get_size = get_size_cb;
	provider->record = record_cb;
	provider->get_value = get_value_cb;

	if (lttng_ust_context_provider_register(provider)) {
		goto error_register;
	}

	provider_ref = (jlong) (long) provider;
	return provider_ref;

	/* Error handling. */
error_register:
	free(provider);
error_provider:
	free(provider_name_cstr);
error_strdup:
error_jstr:
	return 0;
}

/*
 * Unregister a previously-registered context provider.
 *
 * Called from the Java side when an application unregisters a context retriever,
 * so we unregister and delete the corresponding provider on the C side.
 */
JNIEXPORT void JNICALL Java_org_lttng_ust_agent_context_LttngContextApi_unregisterProvider(JNIEnv *env __attribute__((unused)),
						jobject jobj __attribute__((unused)),
						jlong provider_ref)
{
	struct lttng_ust_context_provider *provider =
			(struct lttng_ust_context_provider*) (unsigned long) provider_ref;

	if (!provider) {
		return;
	}

	lttng_ust_context_provider_unregister(provider);

	free(provider->name);
	free(provider);
}
Commit	Line	Data
8ab5c06b	1	/*
c0c0989a	2	* SPDX-License-Identifier: LGPL-2.1-only
8ab5c06b	3	*
c0c0989a MJ	4	* Copyright (C) 2016 EfficiOS Inc.
	5	* Copyright (C) 2016 Alexandre Montplaisir <alexmonthy@efficios.com>
	6	* Copyright (C) 2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8ab5c06b AM	7	*/
	8
	9	#include "org_lttng_ust_agent_context_LttngContextApi.h"
	10
	11	#include <string.h>
	12	#include <inttypes.h>
	13	#include <lttng/ust-events.h>
ef6ae9f9	14	#include <lttng/ringbuffer-context.h>
ae4b659d	15	#include <ust-context-provider.h>
8ab5c06b	16
864a1eda	17	#include "ust-helper.h"
8ab5c06b AM	18	#include "lttng_ust_context.h"
8ab5c06b AM	19
8ab5c06b AM	20	enum lttng_ust_jni_type {
	21	JNI_TYPE_NULL = 0,
	22	JNI_TYPE_INTEGER = 1,
	23	JNI_TYPE_LONG = 2,
	24	JNI_TYPE_DOUBLE = 3,
	25	JNI_TYPE_FLOAT = 4,
	26	JNI_TYPE_BYTE = 5,
	27	JNI_TYPE_SHORT = 6,
	28	JNI_TYPE_BOOLEAN = 7,
	29	JNI_TYPE_STRING = 8,
	30	};
	31
b1ca4c5f AM	32	struct lttng_ust_jni_ctx_entry {
b1ca4c5f AM	33	int32_t context_name_offset;
8ab5c06b AM	34	char type; /* enum lttng_ust_jni_type */
	35	union {
	36	int32_t _integer;
	37	int64_t _long;
	38	double _double;
	39	float _float;
	40	signed char _byte;
	41	int16_t _short;
	42	signed char _boolean;
b1ca4c5f	43	int32_t _string_offset;
8ab5c06b AM	44	} value;
	45	} __attribute__((packed));
	46
	47	/* TLS passing context info from JNI to callbacks. */
16adecf1	48	__thread struct lttng_ust_jni_tls lttng_ust_context_info_tls;
8ab5c06b	49
b1ca4c5f AM	50	static const char *get_ctx_string_at_offset(int32_t offset)
	51	{
	52	signed char *ctx_strings_array = lttng_ust_context_info_tls.ctx_strings;
	53
	54	if (offset < 0 \|\| offset >= lttng_ust_context_info_tls.ctx_strings_len) {
	55	return NULL;
	56	}
	57	return (const char *) (ctx_strings_array + offset);
	58	}
	59
	60	static struct lttng_ust_jni_ctx_entry lookup_ctx_by_name(const char ctx_name)
8ab5c06b	61	{
b1ca4c5f AM	62	struct lttng_ust_jni_ctx_entry *ctx_entries_array = lttng_ust_context_info_tls.ctx_entries;
b1ca4c5f AM	63	int i, len = lttng_ust_context_info_tls.ctx_entries_len / sizeof(struct lttng_ust_jni_ctx_entry);
8ab5c06b AM	64
8ab5c06b AM	65	for (i = 0; i < len; i++) {
b1ca4c5f AM	66	int32_t offset = ctx_entries_array[i].context_name_offset;
	67	const char *string = get_ctx_string_at_offset(offset);
	68
	69	if (string && strcmp(string, ctx_name) == 0) {
	70	return &ctx_entries_array[i];
	71	}
8ab5c06b AM	72	}
8ab5c06b AM	73	return NULL;
8ab5c06b AM	74	}
8ab5c06b AM	75
daacdbfc	76	static size_t get_size_cb(struct lttng_ust_ctx_field *field, size_t offset)
8ab5c06b	77	{
b1ca4c5f	78	struct lttng_ust_jni_ctx_entry *jctx;
8ab5c06b	79	size_t size = 0;
3d66e98c	80	const char *ctx_name = field->event_field->name;
8ab5c06b AM	81	enum lttng_ust_jni_type jni_type;
8ab5c06b AM	82
b1ca4c5f	83
dc325c1d	84	size += lttng_ust_lib_ring_buffer_align(offset, lttng_ust_rb_alignof(char));
8ab5c06b AM	85	size += sizeof(char); /* tag */
	86	jctx = lookup_ctx_by_name(ctx_name);
	87	if (!jctx) {
	88	jni_type = JNI_TYPE_NULL;
	89	} else {
	90	jni_type = jctx->type;
	91	}
	92	switch (jni_type) {
	93	case JNI_TYPE_NULL:
	94	break;
	95	case JNI_TYPE_INTEGER:
dc325c1d	96	size += lttng_ust_lib_ring_buffer_align(offset, lttng_ust_rb_alignof(int32_t));
8ab5c06b AM	97	size += sizeof(int32_t); /* variant */
	98	break;
	99	case JNI_TYPE_LONG:
dc325c1d	100	size += lttng_ust_lib_ring_buffer_align(offset, lttng_ust_rb_alignof(int64_t));
8ab5c06b AM	101	size += sizeof(int64_t); /* variant */
	102	break;
	103	case JNI_TYPE_DOUBLE:
dc325c1d	104	size += lttng_ust_lib_ring_buffer_align(offset, lttng_ust_rb_alignof(double));
8ab5c06b AM	105	size += sizeof(double); /* variant */
	106	break;
	107	case JNI_TYPE_FLOAT:
dc325c1d	108	size += lttng_ust_lib_ring_buffer_align(offset, lttng_ust_rb_alignof(float));
8ab5c06b AM	109	size += sizeof(float); /* variant */
	110	break;
	111	case JNI_TYPE_SHORT:
dc325c1d	112	size += lttng_ust_lib_ring_buffer_align(offset, lttng_ust_rb_alignof(int16_t));
8ab5c06b AM	113	size += sizeof(int16_t); /* variant */
	114	break;
	115	case JNI_TYPE_BYTE: /* Fall-through. */
	116	case JNI_TYPE_BOOLEAN:
dc325c1d	117	size += lttng_ust_lib_ring_buffer_align(offset, lttng_ust_rb_alignof(char));
8ab5c06b AM	118	size += sizeof(char); /* variant */
	119	break;
	120	case JNI_TYPE_STRING:
b1ca4c5f AM	121	{
	122	/* The value is an offset, the string is in the "strings" array */
	123	int32_t string_offset = jctx->value._string_offset;
	124	const char *string = get_ctx_string_at_offset(string_offset);
	125
	126	if (string) {
	127	size += strlen(string) + 1;
	128	}
8ab5c06b	129	break;
b1ca4c5f	130	}
8ab5c06b AM	131	default:
	132	abort();
	133	}
	134	return size;
	135
	136	}
	137
daacdbfc	138	static void record_cb(struct lttng_ust_ctx_field *field,
8ab5c06b	139	struct lttng_ust_lib_ring_buffer_ctx *ctx,
e016c06a	140	struct lttng_ust_channel_buffer *lttng_chan_buf)
8ab5c06b	141	{
b1ca4c5f	142	struct lttng_ust_jni_ctx_entry *jctx;
3d66e98c	143	const char *ctx_name = field->event_field->name;
8ab5c06b AM	144	enum lttng_ust_jni_type jni_type;
	145	char sel_char;
	146
	147	jctx = lookup_ctx_by_name(ctx_name);
	148	if (!jctx) {
	149	jni_type = JNI_TYPE_NULL;
	150	} else {
	151	jni_type = jctx->type;
	152	}
	153
	154	switch (jni_type) {
	155	case JNI_TYPE_NULL:
	156	sel_char = LTTNG_UST_DYNAMIC_TYPE_NONE;
8936b6c0	157	lttng_chan_buf->ops->event_write(ctx, &sel_char, sizeof(sel_char), lttng_ust_rb_alignof(char));
8ab5c06b AM	158	break;
	159	case JNI_TYPE_INTEGER:
	160	{
	161	int32_t v = jctx->value._integer;
	162
	163	sel_char = LTTNG_UST_DYNAMIC_TYPE_S32;
8936b6c0 MD	164	lttng_chan_buf->ops->event_write(ctx, &sel_char, sizeof(sel_char), lttng_ust_rb_alignof(char));
8936b6c0 MD	165	lttng_chan_buf->ops->event_write(ctx, &v, sizeof(v), lttng_ust_rb_alignof(v));
8ab5c06b AM	166	break;
	167	}
	168	case JNI_TYPE_LONG:
	169	{
	170	int64_t v = jctx->value._long;
	171
	172	sel_char = LTTNG_UST_DYNAMIC_TYPE_S64;
8936b6c0 MD	173	lttng_chan_buf->ops->event_write(ctx, &sel_char, sizeof(sel_char), lttng_ust_rb_alignof(char));
8936b6c0 MD	174	lttng_chan_buf->ops->event_write(ctx, &v, sizeof(v), lttng_ust_rb_alignof(v));
8ab5c06b AM	175	break;
	176	}
	177	case JNI_TYPE_DOUBLE:
	178	{
	179	double v = jctx->value._double;
	180
	181	sel_char = LTTNG_UST_DYNAMIC_TYPE_DOUBLE;
8936b6c0 MD	182	lttng_chan_buf->ops->event_write(ctx, &sel_char, sizeof(sel_char), lttng_ust_rb_alignof(char));
8936b6c0 MD	183	lttng_chan_buf->ops->event_write(ctx, &v, sizeof(v), lttng_ust_rb_alignof(v));
8ab5c06b AM	184	break;
	185	}
	186	case JNI_TYPE_FLOAT:
	187	{
	188	float v = jctx->value._float;
	189
	190	sel_char = LTTNG_UST_DYNAMIC_TYPE_FLOAT;
8936b6c0 MD	191	lttng_chan_buf->ops->event_write(ctx, &sel_char, sizeof(sel_char), lttng_ust_rb_alignof(char));
8936b6c0 MD	192	lttng_chan_buf->ops->event_write(ctx, &v, sizeof(v), lttng_ust_rb_alignof(v));
8ab5c06b AM	193	break;
	194	}
	195	case JNI_TYPE_SHORT:
	196	{
	197	int16_t v = jctx->value._short;
	198
	199	sel_char = LTTNG_UST_DYNAMIC_TYPE_S16;
8936b6c0 MD	200	lttng_chan_buf->ops->event_write(ctx, &sel_char, sizeof(sel_char), lttng_ust_rb_alignof(char));
8936b6c0 MD	201	lttng_chan_buf->ops->event_write(ctx, &v, sizeof(v), lttng_ust_rb_alignof(v));
8ab5c06b AM	202	break;
	203	}
	204	case JNI_TYPE_BYTE:
	205	{
	206	char v = jctx->value._byte;
	207
	208	sel_char = LTTNG_UST_DYNAMIC_TYPE_S8;
8936b6c0 MD	209	lttng_chan_buf->ops->event_write(ctx, &sel_char, sizeof(sel_char), lttng_ust_rb_alignof(char));
8936b6c0 MD	210	lttng_chan_buf->ops->event_write(ctx, &v, sizeof(v), lttng_ust_rb_alignof(v));
8ab5c06b AM	211	break;
	212	}
	213	case JNI_TYPE_BOOLEAN:
	214	{
	215	char v = jctx->value._boolean;
	216
	217	sel_char = LTTNG_UST_DYNAMIC_TYPE_S8;
8936b6c0 MD	218	lttng_chan_buf->ops->event_write(ctx, &sel_char, sizeof(sel_char), lttng_ust_rb_alignof(char));
8936b6c0 MD	219	lttng_chan_buf->ops->event_write(ctx, &v, sizeof(v), lttng_ust_rb_alignof(v));
8ab5c06b AM	220	break;
	221	}
	222	case JNI_TYPE_STRING:
	223	{
b1ca4c5f AM	224	int32_t offset = jctx->value._string_offset;
b1ca4c5f AM	225	const char *str = get_ctx_string_at_offset(offset);
8ab5c06b	226
b1ca4c5f AM	227	if (str) {
	228	sel_char = LTTNG_UST_DYNAMIC_TYPE_STRING;
	229	} else {
	230	sel_char = LTTNG_UST_DYNAMIC_TYPE_NONE;
	231	}
8936b6c0	232	lttng_chan_buf->ops->event_write(ctx, &sel_char, sizeof(sel_char), lttng_ust_rb_alignof(char));
b1ca4c5f	233	if (str) {
8936b6c0	234	lttng_chan_buf->ops->event_write(ctx, str, strlen(str) + 1, 1);
b1ca4c5f	235	}
8ab5c06b AM	236	break;
	237	}
	238	default:
	239	abort();
	240	}
	241	}
	242
daacdbfc MD	243	static void get_value_cb(struct lttng_ust_ctx_field *field,
daacdbfc MD	244	struct lttng_ust_ctx_value *value)
8ab5c06b	245	{
b1ca4c5f	246	struct lttng_ust_jni_ctx_entry *jctx;
3d66e98c	247	const char *ctx_name = field->event_field->name;
8ab5c06b AM	248	enum lttng_ust_jni_type jni_type;
	249
	250	jctx = lookup_ctx_by_name(ctx_name);
	251	if (!jctx) {
	252	jni_type = JNI_TYPE_NULL;
	253	} else {
	254	jni_type = jctx->type;
	255	}
	256
	257	switch (jni_type) {
	258	case JNI_TYPE_NULL:
	259	value->sel = LTTNG_UST_DYNAMIC_TYPE_NONE;
	260	break;
	261	case JNI_TYPE_INTEGER:
	262	value->sel = LTTNG_UST_DYNAMIC_TYPE_S64;
	263	value->u.s64 = (int64_t) jctx->value._integer;
	264	break;
	265	case JNI_TYPE_LONG:
	266	value->sel = LTTNG_UST_DYNAMIC_TYPE_S64;
	267	value->u.s64 = jctx->value._long;
	268	break;
	269	case JNI_TYPE_DOUBLE:
	270	value->sel = LTTNG_UST_DYNAMIC_TYPE_DOUBLE;
	271	value->u.d = jctx->value._double;
	272	break;
	273	case JNI_TYPE_FLOAT:
	274	value->sel = LTTNG_UST_DYNAMIC_TYPE_DOUBLE;
	275	value->u.d = (double) jctx->value._float;
	276	break;
	277	case JNI_TYPE_SHORT:
	278	value->sel = LTTNG_UST_DYNAMIC_TYPE_S64;
	279	value->u.s64 = (int64_t) jctx->value._short;
	280	break;
	281	case JNI_TYPE_BYTE:
	282	value->sel = LTTNG_UST_DYNAMIC_TYPE_S64;
	283	value->u.s64 = (int64_t) jctx->value._byte;
	284	break;
	285	case JNI_TYPE_BOOLEAN:
	286	value->sel = LTTNG_UST_DYNAMIC_TYPE_S64;
	287	value->u.s64 = (int64_t) jctx->value._boolean;
	288	break;
	289	case JNI_TYPE_STRING:
b1ca4c5f AM	290	{
	291	int32_t offset = jctx->value._string_offset;
	292	const char *str = get_ctx_string_at_offset(offset);
	293
	294	if (str) {
	295	value->sel = LTTNG_UST_DYNAMIC_TYPE_STRING;
	296	value->u.str = str;
	297	} else {
	298	value->sel = LTTNG_UST_DYNAMIC_TYPE_NONE;
	299	}
8ab5c06b	300	break;
b1ca4c5f	301	}
8ab5c06b AM	302	default:
	303	abort();
	304	}
	305	}
	306
	307	/*
	308	* Register a context provider to UST.
	309	*
	310	* Called from the Java side when an application registers a context retriever,
	311	* so we create and register a corresponding provider on the C side.
	312	*/
	313	JNIEXPORT jlong JNICALL Java_org_lttng_ust_agent_context_LttngContextApi_registerProvider(JNIEnv *env,
2208d8b5	314	jobject jobj __attribute__((unused)),
8ab5c06b AM	315	jstring provider_name)
	316	{
	317	jboolean iscopy;
	318	const char *provider_name_jstr;
	319	char *provider_name_cstr;
	320	struct lttng_ust_context_provider *provider;
	321	/*
	322	* Note: a "jlong" is 8 bytes on all architectures, whereas a
	323	* C "long" varies.
	324	*/
	325	jlong provider_ref;
	326
	327	provider_name_jstr = (*env)->GetStringUTFChars(env, provider_name, &iscopy);
	328	if (!provider_name_jstr) {
	329	goto error_jstr;
	330	}
	331	/* Keep our own copy of the string so UST can use it. */
	332	provider_name_cstr = strdup(provider_name_jstr);
	333	(*env)->ReleaseStringUTFChars(env, provider_name, provider_name_jstr);
	334	if (!provider_name_cstr) {
	335	goto error_strdup;
	336	}
	337	provider = zmalloc(sizeof(*provider));
	338	if (!provider) {
	339	goto error_provider;
	340	}
daacdbfc	341	provider->struct_size = sizeof(*provider);
8ab5c06b AM	342	provider->name = provider_name_cstr;
	343	provider->get_size = get_size_cb;
	344	provider->record = record_cb;
	345	provider->get_value = get_value_cb;
	346
	347	if (lttng_ust_context_provider_register(provider)) {
	348	goto error_register;
	349	}
	350
74687dca	351	provider_ref = (jlong) (long) provider;
8ab5c06b AM	352	return provider_ref;
	353
	354	/* Error handling. */
	355	error_register:
	356	free(provider);
	357	error_provider:
	358	free(provider_name_cstr);
	359	error_strdup:
	360	error_jstr:
	361	return 0;
	362	}
	363
	364	/*
	365	* Unregister a previously-registered context provider.
	366	*
	367	* Called from the Java side when an application unregisters a context retriever,
	368	* so we unregister and delete the corresponding provider on the C side.
	369	*/
2208d8b5 MJ	370	JNIEXPORT void JNICALL Java_org_lttng_ust_agent_context_LttngContextApi_unregisterProvider(JNIEnv *env __attribute__((unused)),
2208d8b5 MJ	371	jobject jobj __attribute__((unused)),
8ab5c06b AM	372	jlong provider_ref)
	373	{
	374	struct lttng_ust_context_provider *provider =
	375	(struct lttng_ust_context_provider*) (unsigned long) provider_ref;
	376
	377	if (!provider) {
	378	return;
	379	}
	380
	381	lttng_ust_context_provider_unregister(provider);
	382
	383	free(provider->name);
	384	free(provider);
	385	}