generator/templates/art/methods.cpp - dawn - Git at Google

 //* Copyright 2024 The Dawn & Tint Authors
 //*
 //* Redistribution and use in source and binary forms, with or without
 //* modification, are permitted provided that the following conditions are met:
 //*
 //* 1. Redistributions of source code must retain the above copyright notice, this
 //*    list of conditions and the following disclaimer.
 //*
 //* 2. Redistributions in binary form must reproduce the above copyright notice,
 //*    this list of conditions and the following disclaimer in the documentation
 //*    and/or other materials provided with the distribution.
 //*
 //* 3. Neither the name of the copyright holder nor the names of its
 //*    contributors may be used to endorse or promote products derived from
 //*    this software without specific prior written permission.
 //*
 //* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 //* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 //* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 //* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 //* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 //* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 //* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 //* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 //* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 //* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 {% from 'art/kotlin_record_conversion.cpp' import define_kotlin_record_structure, define_kotlin_to_struct_conversion with context %}
 {% from 'art/api_jni_types.cpp' import arg_to_jni_type, convert_to_kotlin, jni_signature, to_jni_type with context %}
 #include <jni.h>
 #include <stdlib.h>
 #include <webgpu/webgpu.h>

 #include "JNIContext.h"
 #include "structures.h"

 // Converts every method call from the Kotlin-hosted version to the native version, performing
 // the necessary JNI calls to fetch data, and converting the data to the correct form.

 #define DEFAULT __attribute__((visibility("default")))

 namespace dawn::kotlin_api {

 struct UserData {
     JNIEnv *env;
     jobject callback;
 };

 jobject toByteBuffer(JNIEnv *env, const void* address, jlong size) {
     if (!address) {
         return nullptr;
     }
     jclass byteBufferClass = env->FindClass("java/nio/ByteBuffer");

     //* Dawn always uses little endian format, so we pre-convert for the client's convenience.
     jclass byteOrderClass = env->FindClass("java/nio/ByteOrder");
     jobject littleEndian = env->NewGlobalRef(env->GetStaticObjectField(
             byteOrderClass, env->GetStaticFieldID(byteOrderClass, "LITTLE_ENDIAN",
                                                   "Ljava/nio/ByteOrder;")));

     jobject byteBuffer = env->NewDirectByteBuffer(const_cast<void *>(address), size);

     env->CallObjectMethod(
             byteBuffer, env->GetMethodID(byteBufferClass, "order",
                                          "(Ljava/nio/ByteOrder;)Ljava/nio/ByteBuffer;"),
             littleEndian);
     return byteBuffer;
 }

 {% macro render_method(method, object) %}
     {% set ObjectName = object.name.CamelCase() if object else "FunctionsKt" %}
     {% set FunctionSuffix = ObjectName + "_" +  method.name.camelCase() %}
     {% set KotlinRecord = FunctionSuffix + "KotlinRecord" %}
     {% set ArgsStruct = FunctionSuffix + "ArgsStruct" %}

     //* Define the helper structs to perform most of the conversion.
     struct {{KotlinRecord}} {
         {% for arg in kotlin_record_members(method.arguments) %}
             {{ arg_to_jni_type(arg) }} {{ as_varName(arg.name) }};
         {% endfor %}
     };
     struct {{ArgsStruct}} {
         {% for arg in method.arguments %}
             {{ as_annotated_cType(arg) }};
         {% endfor %}
     };
     {{ define_kotlin_to_struct_conversion("ConvertInternal", KotlinRecord, ArgsStruct, method.arguments)}}

     {% set _kotlin_return = kotlin_return(method) %}
     //*  A JNI-external method is built with the JNI signature expected to match the host Kotlin.
     DEFAULT extern "C"
     {{ arg_to_jni_type(_kotlin_return) }}
     Java_{{ kotlin_package.replace('.', '_') }}_{{ FunctionSuffix }}
             (JNIEnv *env{{ ', jobject obj' if object else ', jclass clazz' -}}

     //* Make the signature for each argument in turn.
     {% for arg in kotlin_record_members(method.arguments) %},
         {{ arg_to_jni_type(arg) }} _{{ as_varName(arg.name) }}
     {% endfor %}) {

     // * Helper context for the duration of this method call.
     JNIContext c(env);

     //* Perform the conversion of arguments.
     {{KotlinRecord}} kotlinRecord;
     {% for arg in kotlin_record_members(method.arguments) %}
         kotlinRecord.{{ as_varName(arg.name) }} = _{{ as_varName(arg.name) }};
     {% endfor %}
     {{ArgsStruct}} args;
     ConvertInternal(&c, kotlinRecord, &args);

     {% if object %}
         jclass memberClass = env->FindClass("{{ jni_name(object) }}");
         jmethodID getHandle = env->GetMethodID(memberClass, "getHandle", "()J");
         auto handle =
                 reinterpret_cast<{{ as_cType(object.name) }}>(env->CallLongMethod(obj, getHandle));
     {% endif %}

     //* Actually invoke the native version of the method.
     {% if _kotlin_return.length == 'size_t' %}
         //* Methods that return containers are converted from two-call to single call, and the
         //* return type is switched to a Kotlin container.
         size_t size = wgpu{{ object.name.CamelCase() }}{{ method.name.CamelCase() }}(handle
             {% for arg in method.arguments -%},
                 //* The replaced output parameter is set to nullptr on the first call.
                 {{ 'nullptr' if arg.annotation == '*' else "args." + as_varName(arg.name) -}}
             {% endfor %}
         );
         //* Allocate the native container
         auto returnAllocation = std::make_unique<{{ as_cType(_kotlin_return.type.name) }}[]>(size);
         if (env->ExceptionCheck()) {  //* Early out if client (Kotlin) callback threw an exception.
             return nullptr;
         }
         //* Second call completes the native container
         wgpu{{ object.name.CamelCase() }}{{ method.name.CamelCase() }}(handle
             {% for arg in method.arguments -%}
                 {{- ', ' if object or not loop.first -}}
                 {{- 'returnAllocation.get()' if arg == _kotlin_return else "args." + as_varName(arg.name) -}}
             {% endfor %}
         );
         if (env->ExceptionCheck()) {  //* Early out if client (Kotlin) callback threw an exception.
             return nullptr;
         }
     {% else %}
         {% if _kotlin_return.annotation == '*' %}
             //* Make a native container to accept the data output via parameter.
             {{ as_cType(_kotlin_return.type.name) }} out = {};
             args.{{ _kotlin_return.name.get() }} = &out;
         {% endif %}
         {{ 'auto result =' if _kotlin_return.type.name.get() != 'void' }}
         {% if object %}
             wgpu{{ object.name.CamelCase() }}{{ method.name.CamelCase() }}(handle
         {% else %}
             wgpu{{ method.name.CamelCase() }}(
         {% endif %}
             {% for arg in method.arguments -%}
                 {{- ',' if object or not loop.first }}args.{{ as_varName(arg.name) -}}
             {% endfor %}
         );
         if (env->ExceptionCheck()) {  //* Early out if client (Kotlin) callback threw an exception.
             return {{ '0' if method.return_type.name.get() != 'void' }};
         }
         {% if method.return_type.name.canonical_case() == 'status' %}
             if (result != WGPUStatus_Success) {
                 //* TODO(b/344805524): custom exception for Dawn.
                 env->ThrowNew(env->FindClass("java/lang/Error"), "Method failed");
                 return {{ '0' if method.return_type.name.get() != 'void' }};
             }
         {% endif %}
     {% endif %}
     {% if _kotlin_return.type.name.get() != 'void' %}
         {% if _kotlin_return.type.name.get() in ['void const *', 'void *'] %}
             size_t size = args.size;
         {% endif %}
         {{ convert_to_kotlin("args." + _kotlin_return.name.get() if _kotlin_return.annotation == '*' else 'result',
                              'result_kt',
                              'size' if _kotlin_return.type.name.get() in ['void const *', 'void *'] or _kotlin_return.length == 'size_t',
                              _kotlin_return) }}
         return result_kt;
     {% endif %}
 } {% endmacro %}

 {% for obj in by_category['object'] %}
     {% for method in obj.methods if include_method(method) %}
         {{ render_method(method, obj) }}
     {% endfor %}

     //* Every object gets a Release method, to supply a Kotlin AutoCloseable.
     extern "C"
     JNIEXPORT void JNICALL
     Java_{{ kotlin_package.replace('.', '_') }}_{{ obj.name.CamelCase() }}_close(
             JNIEnv *env, jobject obj) {
         jclass clz = env->FindClass("{{ jni_name(obj) }}");
         const {{ as_cType(obj.name) }} handle = reinterpret_cast<{{ as_cType(obj.name) }}>(
                 env->CallLongMethod(obj, env->GetMethodID(clz, "getHandle", "()J")));
         wgpu{{ obj.name.CamelCase() }}Release(handle);
     }
 {% endfor %}

 //* Global functions don't have an associated class.
 {% for function in by_category['function'] if include_method(function) %}
     {{ render_method(function, None) }}
 {% endfor %}

 }  // namespace dawn::kotlin_api
	//* Copyright 2024 The Dawn & Tint Authors
	//*
	//* Redistribution and use in source and binary forms, with or without
	//* modification, are permitted provided that the following conditions are met:
	//*
	//* 1. Redistributions of source code must retain the above copyright notice, this
	//* list of conditions and the following disclaimer.
	//*
	//* 2. Redistributions in binary form must reproduce the above copyright notice,
	//* this list of conditions and the following disclaimer in the documentation
	//* and/or other materials provided with the distribution.
	//*
	//* 3. Neither the name of the copyright holder nor the names of its
	//* contributors may be used to endorse or promote products derived from
	//* this software without specific prior written permission.
	//*
	//* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	//* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	//* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	//* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
	//* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	//* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
	//* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
	//* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
	//* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	//* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	{% from 'art/kotlin_record_conversion.cpp' import define_kotlin_record_structure, define_kotlin_to_struct_conversion with context %}
	{% from 'art/api_jni_types.cpp' import arg_to_jni_type, convert_to_kotlin, jni_signature, to_jni_type with context %}
	#include <jni.h>
	#include <stdlib.h>
	#include <webgpu/webgpu.h>

	#include "JNIContext.h"
	#include "structures.h"

	// Converts every method call from the Kotlin-hosted version to the native version, performing
	// the necessary JNI calls to fetch data, and converting the data to the correct form.

	#define DEFAULT __attribute__((visibility("default")))

	namespace dawn::kotlin_api {

	struct UserData {
	JNIEnv *env;
	jobject callback;
	};

	jobject toByteBuffer(JNIEnv env, const void address, jlong size) {
	if (!address) {
	return nullptr;
	}
	jclass byteBufferClass = env->FindClass("java/nio/ByteBuffer");

	//* Dawn always uses little endian format, so we pre-convert for the client's convenience.
	jclass byteOrderClass = env->FindClass("java/nio/ByteOrder");
	jobject littleEndian = env->NewGlobalRef(env->GetStaticObjectField(
	byteOrderClass, env->GetStaticFieldID(byteOrderClass, "LITTLE_ENDIAN",
	"Ljava/nio/ByteOrder;")));

	jobject byteBuffer = env->NewDirectByteBuffer(const_cast<void *>(address), size);

	env->CallObjectMethod(
	byteBuffer, env->GetMethodID(byteBufferClass, "order",
	"(Ljava/nio/ByteOrder;)Ljava/nio/ByteBuffer;"),
	littleEndian);
	return byteBuffer;
	}

	{% macro render_method(method, object) %}
	{% set ObjectName = object.name.CamelCase() if object else "FunctionsKt" %}
	{% set FunctionSuffix = ObjectName + "_" + method.name.camelCase() %}
	{% set KotlinRecord = FunctionSuffix + "KotlinRecord" %}
	{% set ArgsStruct = FunctionSuffix + "ArgsStruct" %}

	//* Define the helper structs to perform most of the conversion.
	struct {{KotlinRecord}} {
	{% for arg in kotlin_record_members(method.arguments) %}
	{{ arg_to_jni_type(arg) }} {{ as_varName(arg.name) }};
	{% endfor %}
	};
	struct {{ArgsStruct}} {
	{% for arg in method.arguments %}
	{{ as_annotated_cType(arg) }};
	{% endfor %}
	};
	{{ define_kotlin_to_struct_conversion("ConvertInternal", KotlinRecord, ArgsStruct, method.arguments)}}

	{% set _kotlin_return = kotlin_return(method) %}
	//* A JNI-external method is built with the JNI signature expected to match the host Kotlin.
	DEFAULT extern "C"
	{{ arg_to_jni_type(_kotlin_return) }}
	Java_{{ kotlin_package.replace('.', '_') }}_{{ FunctionSuffix }}
	(JNIEnv *env{{ ', jobject obj' if object else ', jclass clazz' -}}

	//* Make the signature for each argument in turn.
	{% for arg in kotlin_record_members(method.arguments) %},
	{{ arg_to_jni_type(arg) }} _{{ as_varName(arg.name) }}
	{% endfor %}) {

	// * Helper context for the duration of this method call.
	JNIContext c(env);

	//* Perform the conversion of arguments.
	{{KotlinRecord}} kotlinRecord;
	{% for arg in kotlin_record_members(method.arguments) %}
	kotlinRecord.{{ as_varName(arg.name) }} = _{{ as_varName(arg.name) }};
	{% endfor %}
	{{ArgsStruct}} args;
	ConvertInternal(&c, kotlinRecord, &args);

	{% if object %}
	jclass memberClass = env->FindClass("{{ jni_name(object) }}");
	jmethodID getHandle = env->GetMethodID(memberClass, "getHandle", "()J");
	auto handle =
	reinterpret_cast<{{ as_cType(object.name) }}>(env->CallLongMethod(obj, getHandle));
	{% endif %}

	//* Actually invoke the native version of the method.
	{% if _kotlin_return.length == 'size_t' %}
	//* Methods that return containers are converted from two-call to single call, and the
	//* return type is switched to a Kotlin container.
	size_t size = wgpu{{ object.name.CamelCase() }}{{ method.name.CamelCase() }}(handle
	{% for arg in method.arguments -%},
	//* The replaced output parameter is set to nullptr on the first call.
	{{ 'nullptr' if arg.annotation == '*' else "args." + as_varName(arg.name) -}}
	{% endfor %}
	);
	//* Allocate the native container
	auto returnAllocation = std::make_unique<{{ as_cType(_kotlin_return.type.name) }}[]>(size);
	if (env->ExceptionCheck()) { //* Early out if client (Kotlin) callback threw an exception.
	return nullptr;
	}
	//* Second call completes the native container
	wgpu{{ object.name.CamelCase() }}{{ method.name.CamelCase() }}(handle
	{% for arg in method.arguments -%}
	{{- ', ' if object or not loop.first -}}
	{{- 'returnAllocation.get()' if arg == _kotlin_return else "args." + as_varName(arg.name) -}}
	{% endfor %}
	);
	if (env->ExceptionCheck()) { //* Early out if client (Kotlin) callback threw an exception.
	return nullptr;
	}
	{% else %}
	{% if _kotlin_return.annotation == '*' %}
	//* Make a native container to accept the data output via parameter.
	{{ as_cType(_kotlin_return.type.name) }} out = {};
	args.{{ _kotlin_return.name.get() }} = &out;
	{% endif %}
	{{ 'auto result =' if _kotlin_return.type.name.get() != 'void' }}
	{% if object %}
	wgpu{{ object.name.CamelCase() }}{{ method.name.CamelCase() }}(handle
	{% else %}
	wgpu{{ method.name.CamelCase() }}(
	{% endif %}
	{% for arg in method.arguments -%}
	{{- ',' if object or not loop.first }}args.{{ as_varName(arg.name) -}}
	{% endfor %}
	);
	if (env->ExceptionCheck()) { //* Early out if client (Kotlin) callback threw an exception.
	return {{ '0' if method.return_type.name.get() != 'void' }};
	}
	{% if method.return_type.name.canonical_case() == 'status' %}
	if (result != WGPUStatus_Success) {
	//* TODO(b/344805524): custom exception for Dawn.
	env->ThrowNew(env->FindClass("java/lang/Error"), "Method failed");
	return {{ '0' if method.return_type.name.get() != 'void' }};
	}
	{% endif %}
	{% endif %}
	{% if _kotlin_return.type.name.get() != 'void' %}
	{% if _kotlin_return.type.name.get() in ['void const ', 'void '] %}
	size_t size = args.size;
	{% endif %}
	{{ convert_to_kotlin("args." + _kotlin_return.name.get() if _kotlin_return.annotation == '*' else 'result',
	'result_kt',
	'size' if _kotlin_return.type.name.get() in ['void const ', 'void '] or _kotlin_return.length == 'size_t',
	_kotlin_return) }}
	return result_kt;
	{% endif %}
	} {% endmacro %}

	{% for obj in by_category['object'] %}
	{% for method in obj.methods if include_method(method) %}
	{{ render_method(method, obj) }}
	{% endfor %}

	//* Every object gets a Release method, to supply a Kotlin AutoCloseable.
	extern "C"
	JNIEXPORT void JNICALL
	Java_{{ kotlin_package.replace('.', '_') }}_{{ obj.name.CamelCase() }}_close(
	JNIEnv *env, jobject obj) {
	jclass clz = env->FindClass("{{ jni_name(obj) }}");
	const {{ as_cType(obj.name) }} handle = reinterpret_cast<{{ as_cType(obj.name) }}>(
	env->CallLongMethod(obj, env->GetMethodID(clz, "getHandle", "()J")));
	wgpu{{ obj.name.CamelCase() }}Release(handle);
	}
	{% endfor %}

	//* Global functions don't have an associated class.
	{% for function in by_category['function'] if include_method(function) %}
	{{ render_method(function, None) }}
	{% endfor %}

	} // namespace dawn::kotlin_api