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# Copyright 2023 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Codegen for GEN_JNI.java."""
import common
import java_types
def _stub_for_missing_native(sb, native):
sb(f'public static {native.proxy_return_type.to_java()} {native.proxy_name}')
with sb.param_list() as plist:
plist.extend(p.to_java_declaration() for p in native.proxy_params)
with sb.block():
sb('throw new RuntimeException("Native method not present");\n')
def _forwarding_method(sb, jni_mode, native, target_class_name):
sb(f'public static {native.proxy_return_type.to_java()} {native.proxy_name}')
sb.param_list([p.to_java_declaration() for p in native.proxy_params])
with sb.block():
with sb.statement():
if not native.proxy_return_type.is_void():
sb('return ')
if jni_mode.is_muxing:
sb(f'{target_class_name}.{native.muxed_name}')
with sb.param_list() as plist:
if native.muxed_switch_num != -1:
plist.append(str(native.muxed_switch_num))
plist.extend(p.name for p in native.muxed_params)
else:
sb(f'{target_class_name}.{native.hashed_name}')
sb.param_list([p.name for p in native.proxy_params])
def _native_method(sb, jni_mode, native):
name = native.boundary_name(jni_mode)
if jni_mode.is_hashing:
sb(f'// Original name: {native.java_class.full_name_with_dots}#{native.name}\n'
)
elif not jni_mode.is_muxing:
sb(f'// Hashed name: Java_J_N_{native.hashed_name}\n')
with sb.statement():
sb(f'public static native {native.proxy_return_type.to_java()} {name}')
with sb.param_list() as plist:
if jni_mode.is_muxing:
if native.muxed_switch_num != -1:
plist.append('int _switchNum')
for i, p in enumerate(native.muxed_params):
plist.append(f'{p.java_type.to_java()} p{i}')
else:
plist.extend(p.to_java_declaration() for p in native.proxy_params)
def generate_forwarding(jni_mode, script_name, full_gen_jni_class,
short_gen_jni_class, present_proxy_natives,
absent_proxy_natives):
"""GEN_JNI.java that forwards calls to native methods on N.java."""
sb = common.StringBuilder()
sb(f"""\
//
// This file was generated by {script_name}
//
package {full_gen_jni_class.package_with_dots};
public class {full_gen_jni_class.name}""")
with sb.block():
short_class_with_dots = short_gen_jni_class.full_name_with_dots
for native in present_proxy_natives:
_forwarding_method(sb, jni_mode, native, short_class_with_dots)
for native in absent_proxy_natives:
_stub_for_missing_native(sb, native)
return sb.to_string()
def generate_impl(jni_mode,
script_name,
gen_jni_class,
boundary_proxy_natives,
absent_proxy_natives,
*,
whole_hash=None,
priority_hash=None):
"""GEN_JNI.java (or N.java) that has all "public static native" methods."""
sb = common.StringBuilder()
sb(f"""\
//
// This file was generated by {script_name}
//
package {gen_jni_class.package_with_dots};
public class {gen_jni_class.name}""")
with sb.block():
if jni_mode.is_muxing:
sb(f"""\
public static final long WHOLE_HASH = {whole_hash}L;
public static final long PRIORITY_HASH = {priority_hash}L;
""")
for native in boundary_proxy_natives:
_native_method(sb, jni_mode, native)
for native in absent_proxy_natives:
_stub_for_missing_native(sb, native)
return sb.to_string()
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