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session.c
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session.c
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// Copyright 2021 The IREE Authors
//
// Licensed under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#include "iree/runtime/session.h"
#include <stddef.h>
#include <string.h>
#include "iree/base/internal/atomics.h"
#include "iree/base/internal/file_io.h"
#include "iree/hal/api.h"
#include "iree/modules/hal/module.h"
#include "iree/runtime/instance.h"
#include "iree/vm/api.h"
#include "iree/vm/bytecode/module.h"
//===----------------------------------------------------------------------===//
// iree_runtime_session_options_t
//===----------------------------------------------------------------------===//
IREE_API_EXPORT void iree_runtime_session_options_initialize(
iree_runtime_session_options_t* out_options) {
memset(out_options, 0, sizeof(*out_options));
out_options->context_flags = IREE_VM_CONTEXT_FLAG_NONE;
out_options->builtin_modules = IREE_RUNTIME_SESSION_BUILTIN_ALL;
}
//===----------------------------------------------------------------------===//
// iree_runtime_session_t
//===----------------------------------------------------------------------===//
struct iree_runtime_session_t {
iree_atomic_ref_count_t ref_count;
// Allocator used to allocate the session and all of its resources.
// Independent sessions within the same instance can have unique allocators to
// enable session-level tagging of allocations and pooling.
iree_allocator_t host_allocator;
// The instance this session is a part of; may be shared across many sessions.
// Devices and pools are stored on the instance so that multiple sessions can
// share resources. The session will keep the instance retained for its
// lifetime to ensure that these resources remain available.
iree_runtime_instance_t* instance;
// VM context containing the loaded modules (both builtins and user).
// Thread-compatible; a context carries state that must be externally
// synchronized.
iree_vm_context_t* context;
// The HAL module state bound to the target devices.
// This is used internally by the loaded modules to interact with the devices
// but can also be used by the caller to perform allocation and custom device
// execution.
//
// The state is owned by the context and we have it cached here for faster
// lookup. An application directly using the API may never need this, or could
// perform VM calls into HAL module exports to gain more portability.
iree_vm_module_state_t* hal_module_state;
};
IREE_API_EXPORT iree_status_t iree_runtime_session_create_with_device(
iree_runtime_instance_t* instance,
const iree_runtime_session_options_t* options, iree_hal_device_t* device,
iree_allocator_t host_allocator, iree_runtime_session_t** out_session) {
IREE_ASSERT_ARGUMENT(instance);
IREE_ASSERT_ARGUMENT(options);
IREE_ASSERT_ARGUMENT(device);
IREE_ASSERT_ARGUMENT(out_session);
*out_session = NULL;
IREE_TRACE_ZONE_BEGIN(z0);
// Allocate the session state.
iree_runtime_session_t* session = NULL;
IREE_RETURN_AND_END_ZONE_IF_ERROR(
z0, iree_allocator_malloc(host_allocator, sizeof(*session),
(void**)&session));
session->host_allocator = host_allocator;
iree_atomic_ref_count_init(&session->ref_count);
session->instance = instance;
iree_runtime_instance_retain(session->instance);
// Create the context empty so that we can add our modules to it.
iree_status_t status = iree_vm_context_create(
iree_runtime_instance_vm_instance(instance), options->context_flags,
host_allocator, &session->context);
// Add the HAL module; it is always required when using the runtime API.
// Lower-level usage of the VM can avoid the HAL if it's not required.
iree_vm_module_t* hal_module = NULL;
if (iree_status_is_ok(status)) {
status = iree_hal_module_create(iree_runtime_instance_vm_instance(instance),
/*device_count=*/1, &device,
IREE_HAL_MODULE_FLAG_NONE, host_allocator,
&hal_module);
}
if (iree_status_is_ok(status)) {
status = iree_vm_context_register_modules(
session->context, /*module_count=*/1, /*modules=*/&hal_module);
}
if (iree_status_is_ok(status)) {
status = iree_vm_context_resolve_module_state(session->context, hal_module,
&session->hal_module_state);
}
iree_vm_module_release(hal_module);
if (iree_status_is_ok(status)) {
*out_session = session;
} else {
iree_runtime_session_release(session);
}
IREE_TRACE_ZONE_END(z0);
return status;
}
static void iree_runtime_session_destroy(iree_runtime_session_t* session) {
IREE_ASSERT_ARGUMENT(session);
IREE_TRACE_ZONE_BEGIN(z0);
iree_vm_context_release(session->context);
iree_runtime_instance_release(session->instance);
iree_allocator_free(session->host_allocator, session);
IREE_TRACE_ZONE_END(z0);
}
IREE_API_EXPORT void iree_runtime_session_retain(
iree_runtime_session_t* session) {
if (session) {
iree_atomic_ref_count_inc(&session->ref_count);
}
}
IREE_API_EXPORT void iree_runtime_session_release(
iree_runtime_session_t* session) {
if (session && iree_atomic_ref_count_dec(&session->ref_count) == 1) {
iree_runtime_session_destroy(session);
}
}
IREE_API_EXPORT iree_allocator_t
iree_runtime_session_host_allocator(const iree_runtime_session_t* session) {
IREE_ASSERT_ARGUMENT(session);
return session->host_allocator;
}
IREE_API_EXPORT iree_runtime_instance_t* iree_runtime_session_instance(
const iree_runtime_session_t* session) {
IREE_ASSERT_ARGUMENT(session);
return session->instance;
}
IREE_API_EXPORT iree_vm_context_t* iree_runtime_session_context(
const iree_runtime_session_t* session) {
IREE_ASSERT_ARGUMENT(session);
return session->context;
}
IREE_API_EXPORT iree_hal_device_t* iree_runtime_session_device(
const iree_runtime_session_t* session) {
IREE_ASSERT_ARGUMENT(session);
// NOTE: only one device is supported via this API today.
return iree_hal_module_state_device_get(session->hal_module_state, 0);
}
IREE_API_EXPORT iree_hal_allocator_t* iree_runtime_session_device_allocator(
const iree_runtime_session_t* session) {
iree_hal_device_t* device = iree_runtime_session_device(session);
if (!device) return NULL;
return iree_hal_device_allocator(device);
}
IREE_API_EXPORT iree_status_t
iree_runtime_session_trim(iree_runtime_session_t* session) {
IREE_ASSERT_ARGUMENT(session);
IREE_TRACE_ZONE_BEGIN(z0);
iree_status_t status = iree_vm_context_notify(
iree_runtime_session_context(session), IREE_VM_SIGNAL_LOW_MEMORY);
IREE_TRACE_ZONE_END(z0);
return status;
}
IREE_API_EXPORT iree_status_t iree_runtime_session_append_module(
iree_runtime_session_t* session, iree_vm_module_t* module) {
IREE_ASSERT_ARGUMENT(session);
IREE_ASSERT_ARGUMENT(module);
IREE_TRACE_ZONE_BEGIN(z0);
IREE_TRACE_ZONE_APPEND_TEXT(z0, iree_vm_module_name(module).data,
iree_vm_module_name(module).size);
iree_status_t status =
iree_vm_context_register_modules(iree_runtime_session_context(session),
/*module_count=*/1, /*modules=*/&module);
IREE_TRACE_ZONE_END(z0);
return status;
}
IREE_API_EXPORT iree_status_t
iree_runtime_session_append_bytecode_module_from_memory(
iree_runtime_session_t* session, iree_const_byte_span_t flatbuffer_data,
iree_allocator_t flatbuffer_allocator) {
IREE_ASSERT_ARGUMENT(session);
IREE_TRACE_ZONE_BEGIN(z0);
// NOTE: we always consume the flatbuffer data even if we fail and need to
// make sure all code paths guarantee it has been freed.
iree_vm_module_t* module = NULL;
iree_status_t status = iree_vm_bytecode_module_create(
iree_runtime_instance_vm_instance(session->instance), flatbuffer_data,
flatbuffer_allocator, iree_runtime_session_host_allocator(session),
&module);
if (iree_status_is_ok(status)) {
// Append may fail and we still need to clean up the module.
status = iree_runtime_session_append_module(session, module);
iree_vm_module_release(module);
} else {
// API requires that we free the flatbuffer data even on failure.
iree_allocator_free(flatbuffer_allocator, (void*)flatbuffer_data.data);
}
IREE_TRACE_ZONE_END(z0);
return status;
}
IREE_API_EXPORT iree_status_t
iree_runtime_session_append_bytecode_module_from_file(
iree_runtime_session_t* session, const char* file_path) {
IREE_ASSERT_ARGUMENT(session);
IREE_TRACE_ZONE_BEGIN(z0);
IREE_TRACE_ZONE_APPEND_TEXT(z0, file_path);
// TODO(#3909): actually map the memory here. For now we just load the
// contents.
iree_file_contents_t* flatbuffer_contents = NULL;
IREE_RETURN_AND_END_ZONE_IF_ERROR(
z0, iree_file_read_contents(file_path, IREE_FILE_READ_FLAG_DEFAULT,
iree_runtime_session_host_allocator(session),
&flatbuffer_contents));
// Create the module from the file contents. The contents are consumed
// regardless of whether the module can be loaded or not.
iree_status_t status =
iree_runtime_session_append_bytecode_module_from_memory(
session, flatbuffer_contents->const_buffer,
iree_file_contents_deallocator(flatbuffer_contents));
IREE_TRACE_ZONE_END(z0);
return status;
}
IREE_API_EXPORT iree_status_t
iree_runtime_session_append_bytecode_module_from_stdin(
iree_runtime_session_t* session) {
IREE_ASSERT_ARGUMENT(session);
IREE_TRACE_ZONE_BEGIN(z0);
iree_file_contents_t* flatbuffer_contents = NULL;
IREE_RETURN_AND_END_ZONE_IF_ERROR(
z0, iree_stdin_read_contents(iree_runtime_session_host_allocator(session),
&flatbuffer_contents));
// Create the module from the stream contents. The contents are consumed
// regardless of whether the module can be loaded or not.
iree_status_t status =
iree_runtime_session_append_bytecode_module_from_memory(
session, flatbuffer_contents->const_buffer,
iree_file_contents_deallocator(flatbuffer_contents));
IREE_TRACE_ZONE_END(z0);
return status;
}
IREE_API_EXPORT iree_status_t iree_runtime_session_lookup_function(
const iree_runtime_session_t* session, iree_string_view_t full_name,
iree_vm_function_t* out_function) {
IREE_ASSERT_ARGUMENT(session);
IREE_ASSERT_ARGUMENT(out_function);
IREE_TRACE_ZONE_BEGIN(z0);
iree_status_t status = iree_vm_context_resolve_function(
iree_runtime_session_context(session), full_name, out_function);
IREE_TRACE_ZONE_END(z0);
return status;
}
IREE_API_EXPORT iree_status_t iree_runtime_session_call(
iree_runtime_session_t* session, const iree_vm_function_t* function,
iree_vm_list_t* input_list, iree_vm_list_t* output_list) {
IREE_ASSERT_ARGUMENT(session);
IREE_ASSERT_ARGUMENT(function);
IREE_TRACE_ZONE_BEGIN(z0);
iree_status_t status =
iree_vm_invoke(iree_runtime_session_context(session), *function,
IREE_VM_INVOCATION_FLAG_NONE,
/*policy=*/NULL, input_list, output_list,
iree_runtime_session_host_allocator(session));
IREE_TRACE_ZONE_END(z0);
return status;
}
IREE_API_EXPORT iree_status_t iree_runtime_session_call_by_name(
iree_runtime_session_t* session, iree_string_view_t full_name,
iree_vm_list_t* input_list, iree_vm_list_t* output_list) {
IREE_ASSERT_ARGUMENT(session);
iree_vm_function_t function;
IREE_RETURN_IF_ERROR(
iree_runtime_session_lookup_function(session, full_name, &function));
return iree_runtime_session_call(session, &function, input_list, output_list);
}
IREE_API_EXPORT iree_status_t iree_runtime_session_call_direct(
iree_runtime_session_t* session, const iree_vm_function_call_t call) {
IREE_ASSERT_ARGUMENT(session);
IREE_TRACE_ZONE_BEGIN(z0);
// Allocate a VM stack on the host stack and initialize it.
iree_vm_context_t* context = iree_runtime_session_context(session);
IREE_VM_INLINE_STACK_INITIALIZE(stack, IREE_VM_INVOCATION_FLAG_NONE,
iree_vm_context_state_resolver(context),
iree_runtime_session_host_allocator(session));
// Issue the call.
iree_status_t status =
call.function.module->begin_call(call.function.module->self, stack, call);
// Cleanup the stack.
iree_vm_stack_deinitialize(stack);
IREE_TRACE_ZONE_END(z0);
return status;
}