jvmtiMemory.c

/*******************************************************************************
 * Copyright IBM Corp. and others 1991
 *
 * This program and the accompanying materials are made available under
 * the terms of the Eclipse Public License 2.0 which accompanies this
 * distribution and is available at https://www.eclipse.org/legal/epl-2.0/
 * or the Apache License, Version 2.0 which accompanies this distribution and
 * is available at https://www.apache.org/licenses/LICENSE-2.0.
 *
 * This Source Code may also be made available under the following
 * Secondary Licenses when the conditions for such availability set
 * forth in the Eclipse Public License, v. 2.0 are satisfied: GNU
 * General Public License, version 2 with the GNU Classpath
 * Exception [1] and GNU General Public License, version 2 with the
 * OpenJDK Assembly Exception [2].
 *
 * [1] https://www.gnu.org/software/classpath/license.html
 * [2] https://openjdk.org/legal/assembly-exception.html
 *
 * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0-only WITH Classpath-exception-2.0 OR GPL-2.0-only WITH OpenJDK-assembly-exception-1.0
 *******************************************************************************/

#include "jvmtiHelpers.h"
#include "jvmti_internal.h"
#include "j9port.h"

jvmtiError JNICALL
jvmtiAllocate(jvmtiEnv* env,
	jlong size,
	unsigned char** mem_ptr)
{
	unsigned char *rv_mem = NULL;
	jvmtiError rc;

	Trc_JVMTI_jvmtiAllocate_Entry(env, mem_ptr);

	ENSURE_NON_NEGATIVE(size);
	ENSURE_NON_NULL(mem_ptr);

#ifndef J9VM_ENV_DATA64
	if (size > (jlong)0xFFFFFFFF) {
		JVMTI_ERROR(JVMTI_ERROR_OUT_OF_MEMORY);
	}
#endif

	if (size != 0) {
		PORT_ACCESS_FROM_JVMTI(env);

		rv_mem = j9mem_allocate_memory((UDATA) size, J9MEM_CATEGORY_JVMTI_ALLOCATE);
		if (rv_mem == NULL) {
			JVMTI_ERROR(JVMTI_ERROR_OUT_OF_MEMORY);
		}
	}

	rc = JVMTI_ERROR_NONE;
done:

	if (NULL != mem_ptr) {
		*mem_ptr = rv_mem;
	}
	Trc_JVMTI_jvmtiAllocate_Exit(rc, rv_mem);
	return rc;
}


jvmtiError JNICALL
jvmtiDeallocate(jvmtiEnv* env,
	unsigned char* mem)
{
	jvmtiError rc = JVMTI_ERROR_NONE;

	Trc_JVMTI_jvmtiDeallocate_Entry(env, mem);

	if (mem != NULL) {
		PORT_ACCESS_FROM_JVMTI(env);

		j9mem_free_memory(mem);
	}

	TRACE_JVMTI_RETURN(jvmtiDeallocate);
}

#if JAVA_SPEC_VERSION >= 11
jvmtiError JNICALL 
jvmtiSetHeapSamplingInterval(jvmtiEnv *env, 
	jint samplingInterval)
{
	jvmtiError rc = JVMTI_ERROR_NONE;
	J9JavaVM *vm = JAVAVM_FROM_ENV(env);
	
	Trc_JVMTI_jvmtiSetHeapSamplingInterval_Entry(env, samplingInterval);
	
	ENSURE_PHASE_ONLOAD_OR_LIVE(env);
	ENSURE_CAPABILITY(env, can_generate_sampled_object_alloc_events);
	ENSURE_NON_NEGATIVE(samplingInterval);

	/* No negative samplingInterval, and there is no data lost when jint is casted to UDATA. */
	vm->memoryManagerFunctions->j9gc_set_allocation_sampling_interval(vm, samplingInterval);

done:
	TRACE_JVMTI_RETURN(jvmtiSetHeapSamplingInterval);
}
#endif /* JAVA_SPEC_VERSION >= 11 */