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# Copyright 2016 The Gemmlowp Authors. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""CC code emitter.
Used by generators to programatically prepare C++ code. Contains some simple
tools that allow generating nicely indented code and do basic correctness
checking.
"""
class Error(Exception):
"""Module level error."""
class NamespaceError(Error):
"""Invalid namespace operation."""
class HeaderError(Error):
"""Invalid cc header structure."""
class ClassError(Error):
"""Invalid class syntax."""
class CCEmitter(object):
"""Emits c++ code."""
def __init__(self, debug=False):
self.indent = ''
self.debug = debug
self.namespaces = []
self.classes = []
self.header_name = None
def PushIndent(self):
self.indent += ' '
def PopIndent(self):
self.indent = self.indent[:-2]
def EmitIndented(self, what):
print(self.indent + what)
def EmitNewline(self):
print('')
def EmitPreprocessor1(self, op, param):
print('#%s %s' % (op, param))
def EmitPreprocessor(self, op):
print('#%s' % op)
def EmitInclude(self, include):
self.EmitPreprocessor1('include', include)
def EmitAssign(self, variable, value):
self.EmitBinaryOp(variable, '=', value)
def EmitAssignIncrement(self, variable, value):
self.EmitBinaryOp(variable, '+=', value)
def EmitBinaryOp(self, operand_1, op, operand_2):
self.EmitCode('%s %s %s' % (operand_1, op, operand_2))
def EmitCall(self, function, params=None):
if not params:
params = []
self.EmitCode('%s(%s)' % (function, ', '.join(map(str, params))))
def EmitCode(self, code):
self.EmitIndented('%s;' % code)
def EmitCodeNoSemicolon(self, code):
self.EmitIndented('%s' % code)
def EmitDeclare(self, decl_type, name, value):
self.EmitAssign('%s %s' % (decl_type, name), value)
def EmitAssert(self, assert_expression):
if self.debug:
self.EmitCall1('assert', assert_expression)
def EmitHeaderBegin(self, header_name, includes=None):
if includes is None:
includes = []
if self.header_name:
raise HeaderError('Header already defined.')
self.EmitPreprocessor1('ifndef', (header_name + '_H_').upper())
self.EmitPreprocessor1('define', (header_name + '_H_').upper())
self.EmitNewline()
if includes:
for include in includes:
self.EmitInclude(include)
self.EmitNewline()
self.header_name = header_name
def EmitHeaderEnd(self):
if not self.header_name:
raise HeaderError('Header undefined.')
self.EmitPreprocessor1('endif',
' // %s' % (self.header_name + '_H_').upper())
self.header_name = None
def EmitMemberFunctionBegin(self, class_name, class_template_params,
class_specializations, function_name,
function_params, return_type):
"""Emit member function of a template/specialized class."""
if class_template_params or class_specializations:
self.EmitIndented('template<%s>' % ', '.join(class_template_params))
if class_specializations:
class_name += '<%s>' % ', '.join(map(str, class_specializations))
self.EmitIndented('%s %s::%s(%s) {' % (
return_type, class_name, function_name,
', '.join(['%s %s' % (t, n) for (t, n) in function_params])))
self.PushIndent()
def EmitFunctionBegin(self, function_name, params, return_type):
self.EmitIndented('%s %s(%s) {' %
(return_type, function_name,
', '.join(['%s %s' % (t, n) for (t, n) in params])))
self.PushIndent()
def EmitFunctionEnd(self):
self.PopIndent()
self.EmitIndented('}')
self.EmitNewline()
def EmitClassBegin(self, class_name, template_params, specializations,
base_classes):
"""Emit class block header."""
self.classes.append(class_name)
if template_params or specializations:
self.EmitIndented('template<%s>' % ', '.join(template_params))
class_name_extended = class_name
if specializations:
class_name_extended += '<%s>' % ', '.join(map(str, specializations))
if base_classes:
class_name_extended += ' : ' + ', '.join(base_classes)
self.EmitIndented('class %s {' % class_name_extended)
self.PushIndent()
def EmitClassEnd(self):
if not self.classes:
raise ClassError('No class on stack.')
self.classes.pop()
self.PopIndent()
self.EmitIndented('};')
self.EmitNewline()
def EmitAccessModifier(self, modifier):
if not self.classes:
raise ClassError('No class on stack.')
self.PopIndent()
self.EmitIndented(' %s:' % modifier)
self.PushIndent()
def EmitNamespaceBegin(self, namespace):
self.EmitCodeNoSemicolon('namespace %s {' % namespace)
self.namespaces.append(namespace)
def EmitNamespaceEnd(self):
if not self.namespaces:
raise NamespaceError('No namespace on stack.')
self.EmitCodeNoSemicolon('} // namespace %s' % self.namespaces.pop())
def EmitComment(self, comment):
self.EmitIndented('// ' + comment)
def EmitOpenBracket(self, pre_bracket=None):
if pre_bracket:
self.EmitIndented('%s {' % pre_bracket)
else:
self.EmitIndented('{')
self.PushIndent()
def EmitCloseBracket(self):
self.PopIndent()
self.EmitIndented('}')
def EmitSwitch(self, switch):
self.EmitOpenBracket('switch (%s)' % switch)
def EmitSwitchEnd(self):
self.EmitCloseBracket()
def EmitCase(self, value):
self.EmitCodeNoSemicolon('case %s:' % value)
def EmitBreak(self):
self.EmitCode('break')
def EmitIf(self, condition):
self.EmitOpenBracket('if (%s)' % condition)
def EmitElse(self):
self.PopIndent()
self.EmitCodeNoSemicolon('} else {')
self.PushIndent()
def EmitEndif(self):
self.EmitCloseBracket()
def Scope(self, scope, value):
return '%s::%s' % (scope, value)
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