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# Copyright 2024 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Codegen common to .h files."""
import common
import java_types
def class_accessors(sb, java_classes, module_name):
split_arg = f'"{module_name}", ' if module_name else ''
for java_class in java_classes:
if java_class in (java_types.OBJECT_CLASS, java_types.STRING_CLASS):
continue
escaped_name = java_class.to_cpp()
# #ifdef needed when multple .h files are #included that common classes.
sb(f"""\
#ifndef {escaped_name}_clazz_defined
#define {escaped_name}_clazz_defined
""")
# Uses std::atomic<> instead of "static jclass cached_class = ..." because
# that moves the initialize-once logic into the helper method (smaller code
# size).
# The static local cached_class might get duplicated in component builds,
# due to having hidden visibility. However, this duplication is safe because
# it will always hold the same value, so the copies can't get out-of-sync.
sb(f"""\
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wunique-object-duplication"
inline jclass {escaped_name}_clazz(JNIEnv* env) {{
static const char kClassName[] = "{java_class.full_name_with_slashes}";
static std::atomic<jclass> cached_class;
return jni_zero::internal::LazyGetClass(env, kClassName, {split_arg}&cached_class);
}}
#pragma clang diagnostic pop
#endif
""")
def class_accessor_expression(java_class):
if java_class == java_types.OBJECT_CLASS:
return 'jni_zero::g_object_class'
if java_class == java_types.STRING_CLASS:
return 'jni_zero::g_string_class'
return f'{java_class.to_cpp()}_clazz(env)'
def header_preamble(script_name,
java_class,
system_includes,
user_includes,
header_guard=None):
if header_guard is None:
header_guard = f'{java_class.to_cpp()}_JNI'
sb = []
sb.append(f"""\
// This file was generated by
// {script_name}
// For
// {java_class.full_name_with_dots}
#ifndef {header_guard}
#define {header_guard}
""")
sb.extend(f'#include <{x}>\n' for x in system_includes)
sb.append('\n')
sb.extend(f'#include "{x}"\n' for x in user_includes)
preamble = ''.join(sb)
epilogue = f"""
#endif // {header_guard}
"""
return preamble, epilogue
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