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Edit File : c_generator.py \| Size : 13.25 KB
#------------------------------------------------------------------------------ # pycparser: c_generator.py # # C code generator from pycparser AST nodes. # # Copyright (C) 2008-2015, Eli Bendersky # License: BSD #------------------------------------------------------------------------------ from . import c_ast class CGenerator(object): """ Uses the same visitor pattern as c_ast.NodeVisitor, but modified to return a value from each visit method, using string accumulation in generic_visit. """ def __init__(self): # Statements start with indentation of self.indent_level spaces, using # the _make_indent method # self.indent_level = 0 def _make_indent(self): return ' ' * self.indent_level def visit(self, node): method = 'visit_' + node.__class__.__name__ return getattr(self, method, self.generic_visit)(node) def generic_visit(self, node): #~ print('generic:', type(node)) if node is None: return '' else: return ''.join(self.visit(c) for c_name, c in node.children()) def visit_Constant(self, n): return n.value def visit_ID(self, n): return n.name def visit_ArrayRef(self, n): arrref = self._parenthesize_unless_simple(n.name) return arrref + '[' + self.visit(n.subscript) + ']' def visit_StructRef(self, n): sref = self._parenthesize_unless_simple(n.name) return sref + n.type + self.visit(n.field) def visit_FuncCall(self, n): fref = self._parenthesize_unless_simple(n.name) return fref + '(' + self.visit(n.args) + ')' def visit_UnaryOp(self, n): operand = self._parenthesize_unless_simple(n.expr) if n.op == 'p++': return '%s++' % operand elif n.op == 'p--': return '%s--' % operand elif n.op == 'sizeof': # Always parenthesize the argument of sizeof since it can be # a name. return 'sizeof(%s)' % self.visit(n.expr) else: return '%s%s' % (n.op, operand) def visit_BinaryOp(self, n): lval_str = self._parenthesize_if(n.left, lambda d: not self._is_simple_node(d)) rval_str = self._parenthesize_if(n.right, lambda d: not self._is_simple_node(d)) return '%s %s %s' % (lval_str, n.op, rval_str) def visit_Assignment(self, n): rval_str = self._parenthesize_if( n.rvalue, lambda n: isinstance(n, c_ast.Assignment)) return '%s %s %s' % (self.visit(n.lvalue), n.op, rval_str) def visit_IdentifierType(self, n): return ' '.join(n.names) def _visit_expr(self, n): if isinstance(n, c_ast.InitList): return '{' + self.visit(n) + '}' elif isinstance(n, c_ast.ExprList): return '(' + self.visit(n) + ')' else: return self.visit(n) def visit_Decl(self, n, no_type=False): # no_type is used when a Decl is part of a DeclList, where the type is # explicitly only for the first declaration in a list. # s = n.name if no_type else self._generate_decl(n) if n.bitsize: s += ' : ' + self.visit(n.bitsize) if n.init: s += ' = ' + self._visit_expr(n.init) return s def visit_DeclList(self, n): s = self.visit(n.decls[0]) if len(n.decls) > 1: s += ', ' + ', '.join(self.visit_Decl(decl, no_type=True) for decl in n.decls[1:]) return s def visit_Typedef(self, n): s = '' if n.storage: s += ' '.join(n.storage) + ' ' s += self._generate_type(n.type) return s def visit_Cast(self, n): s = '(' + self._generate_type(n.to_type) + ')' return s + ' ' + self._parenthesize_unless_simple(n.expr) def visit_ExprList(self, n): visited_subexprs = [] for expr in n.exprs: visited_subexprs.append(self._visit_expr(expr)) return ', '.join(visited_subexprs) def visit_InitList(self, n): visited_subexprs = [] for expr in n.exprs: visited_subexprs.append(self._visit_expr(expr)) return ', '.join(visited_subexprs) def visit_Enum(self, n): s = 'enum' if n.name: s += ' ' + n.name if n.values: s += ' {' for i, enumerator in enumerate(n.values.enumerators): s += enumerator.name if enumerator.value: s += ' = ' + self.visit(enumerator.value) if i != len(n.values.enumerators) - 1: s += ', ' s += '}' return s def visit_FuncDef(self, n): decl = self.visit(n.decl) self.indent_level = 0 body = self.visit(n.body) if n.param_decls: knrdecls = ';\n'.join(self.visit(p) for p in n.param_decls) return decl + '\n' + knrdecls + ';\n' + body + '\n' else: return decl + '\n' + body + '\n' def visit_FileAST(self, n): s = '' for ext in n.ext: if isinstance(ext, c_ast.FuncDef): s += self.visit(ext) else: s += self.visit(ext) + ';\n' return s def visit_Compound(self, n): s = self._make_indent() + '{\n' self.indent_level += 2 if n.block_items: s += ''.join(self._generate_stmt(stmt) for stmt in n.block_items) self.indent_level -= 2 s += self._make_indent() + '}\n' return s def visit_EmptyStatement(self, n): return ';' def visit_ParamList(self, n): return ', '.join(self.visit(param) for param in n.params) def visit_Return(self, n): s = 'return' if n.expr: s += ' ' + self.visit(n.expr) return s + ';' def visit_Break(self, n): return 'break;' def visit_Continue(self, n): return 'continue;' def visit_TernaryOp(self, n): s = self._visit_expr(n.cond) + ' ? ' s += self._visit_expr(n.iftrue) + ' : ' s += self._visit_expr(n.iffalse) return s def visit_If(self, n): s = 'if (' if n.cond: s += self.visit(n.cond) s += ')\n' s += self._generate_stmt(n.iftrue, add_indent=True) if n.iffalse: s += self._make_indent() + 'else\n' s += self._generate_stmt(n.iffalse, add_indent=True) return s def visit_For(self, n): s = 'for (' if n.init: s += self.visit(n.init) s += ';' if n.cond: s += ' ' + self.visit(n.cond) s += ';' if n.next: s += ' ' + self.visit(n.next) s += ')\n' s += self._generate_stmt(n.stmt, add_indent=True) return s def visit_While(self, n): s = 'while (' if n.cond: s += self.visit(n.cond) s += ')\n' s += self._generate_stmt(n.stmt, add_indent=True) return s def visit_DoWhile(self, n): s = 'do\n' s += self._generate_stmt(n.stmt, add_indent=True) s += self._make_indent() + 'while (' if n.cond: s += self.visit(n.cond) s += ');' return s def visit_Switch(self, n): s = 'switch (' + self.visit(n.cond) + ')\n' s += self._generate_stmt(n.stmt, add_indent=True) return s def visit_Case(self, n): s = 'case ' + self.visit(n.expr) + ':\n' for stmt in n.stmts: s += self._generate_stmt(stmt, add_indent=True) return s def visit_Default(self, n): s = 'default:\n' for stmt in n.stmts: s += self._generate_stmt(stmt, add_indent=True) return s def visit_Label(self, n): return n.name + ':\n' + self._generate_stmt(n.stmt) def visit_Goto(self, n): return 'goto ' + n.name + ';' def visit_EllipsisParam(self, n): return '...' def visit_Struct(self, n): return self._generate_struct_union(n, 'struct') def visit_Typename(self, n): return self._generate_type(n.type) def visit_Union(self, n): return self._generate_struct_union(n, 'union') def visit_NamedInitializer(self, n): s = '' for name in n.name: if isinstance(name, c_ast.ID): s += '.' + name.name elif isinstance(name, c_ast.Constant): s += '[' + name.value + ']' s += ' = ' + self.visit(n.expr) return s def visit_FuncDecl(self, n): return self._generate_type(n) def _generate_struct_union(self, n, name): """ Generates code for structs and unions. name should be either 'struct' or union. """ s = name + ' ' + (n.name or '') if n.decls: s += '\n' s += self._make_indent() self.indent_level += 2 s += '{\n' for decl in n.decls: s += self._generate_stmt(decl) self.indent_level -= 2 s += self._make_indent() + '}' return s def _generate_stmt(self, n, add_indent=False): """ Generation from a statement node. This method exists as a wrapper for individual visit_* methods to handle different treatment of some statements in this context. """ typ = type(n) if add_indent: self.indent_level += 2 indent = self._make_indent() if add_indent: self.indent_level -= 2 if typ in ( c_ast.Decl, c_ast.Assignment, c_ast.Cast, c_ast.UnaryOp, c_ast.BinaryOp, c_ast.TernaryOp, c_ast.FuncCall, c_ast.ArrayRef, c_ast.StructRef, c_ast.Constant, c_ast.ID, c_ast.Typedef, c_ast.ExprList): # These can also appear in an expression context so no semicolon # is added to them automatically # return indent + self.visit(n) + ';\n' elif typ in (c_ast.Compound,): # No extra indentation required before the opening brace of a # compound - because it consists of multiple lines it has to # compute its own indentation. # return self.visit(n) else: return indent + self.visit(n) + '\n' def _generate_decl(self, n): """ Generation from a Decl node. """ s = '' if n.funcspec: s = ' '.join(n.funcspec) + ' ' if n.storage: s += ' '.join(n.storage) + ' ' s += self._generate_type(n.type) return s def _generate_type(self, n, modifiers=[]): """ Recursive generation from a type node. n is the type node. modifiers collects the PtrDecl, ArrayDecl and FuncDecl modifiers encountered on the way down to a TypeDecl, to allow proper generation from it. """ typ = type(n) #~ print(n, modifiers) if typ == c_ast.TypeDecl: s = '' if n.quals: s += ' '.join(n.quals) + ' ' s += self.visit(n.type) nstr = n.declname if n.declname else '' # Resolve modifiers. # Wrap in parens to distinguish pointer to array and pointer to # function syntax. # for i, modifier in enumerate(modifiers): if isinstance(modifier, c_ast.ArrayDecl): if (i != 0 and isinstance(modifiers[i - 1], c_ast.PtrDecl)): nstr = '(' + nstr + ')' nstr += '[' + self.visit(modifier.dim) + ']' elif isinstance(modifier, c_ast.FuncDecl): if (i != 0 and isinstance(modifiers[i - 1], c_ast.PtrDecl)): nstr = '(' + nstr + ')' nstr += '(' + self.visit(modifier.args) + ')' elif isinstance(modifier, c_ast.PtrDecl): if modifier.quals: nstr = '* %s %s' % (' '.join(modifier.quals), nstr) else: nstr = '*' + nstr if nstr: s += ' ' + nstr return s elif typ == c_ast.Decl: return self._generate_decl(n.type) elif typ == c_ast.Typename: return self._generate_type(n.type) elif typ == c_ast.IdentifierType: return ' '.join(n.names) + ' ' elif typ in (c_ast.ArrayDecl, c_ast.PtrDecl, c_ast.FuncDecl): return self._generate_type(n.type, modifiers + [n]) else: return self.visit(n) def _parenthesize_if(self, n, condition): """ Visits 'n' and returns its string representation, parenthesized if the condition function applied to the node returns True. """ s = self._visit_expr(n) if condition(n): return '(' + s + ')' else: return s def _parenthesize_unless_simple(self, n): """ Common use case for _parenthesize_if """ return self._parenthesize_if(n, lambda d: not self._is_simple_node(d)) def _is_simple_node(self, n): """ Returns True for nodes that are "simple" - i.e. nodes that always have higher precedence than operators. """ return isinstance(n,( c_ast.Constant, c_ast.ID, c_ast.ArrayRef, c_ast.StructRef, c_ast.FuncCall)) Back

Edit File : c_generator.py | Size : 13.25 KB

#------------------------------------------------------------------------------
# pycparser: c_generator.py
#
# C code generator from pycparser AST nodes.
#
# Copyright (C) 2008-2015, Eli Bendersky
# License: BSD
#------------------------------------------------------------------------------
from . import c_ast

class CGenerator(object):
    """ Uses the same visitor pattern as c_ast.NodeVisitor, but modified to
        return a value from each visit method, using string accumulation in
        generic_visit.
    """
    def __init__(self):
        # Statements start with indentation of self.indent_level spaces, using
        # the _make_indent method
        #
        self.indent_level = 0

def _make_indent(self):
        return ' ' * self.indent_level

def visit(self, node):
        method = 'visit_' + node.__class__.__name__
        return getattr(self, method, self.generic_visit)(node)

def generic_visit(self, node):
        #~ print('generic:', type(node))
        if node is None:
            return ''
        else:
            return ''.join(self.visit(c) for c_name, c in node.children())

def visit_Constant(self, n):
        return n.value

def visit_ID(self, n):
        return n.name

def visit_ArrayRef(self, n):
        arrref = self._parenthesize_unless_simple(n.name)
        return arrref + '[' + self.visit(n.subscript) + ']'

def visit_StructRef(self, n):
        sref = self._parenthesize_unless_simple(n.name)
        return sref + n.type + self.visit(n.field)

def visit_FuncCall(self, n):
        fref = self._parenthesize_unless_simple(n.name)
        return fref + '(' + self.visit(n.args) + ')'

def visit_UnaryOp(self, n):
        operand = self._parenthesize_unless_simple(n.expr)
        if n.op == 'p++':
            return '%s++' % operand
        elif n.op == 'p--':
            return '%s--' % operand
        elif n.op == 'sizeof':
            # Always parenthesize the argument of sizeof since it can be
            # a name.
            return 'sizeof(%s)' % self.visit(n.expr)
        else:
            return '%s%s' % (n.op, operand)

def visit_BinaryOp(self, n):
        lval_str = self._parenthesize_if(n.left,
                            lambda d: not self._is_simple_node(d))
        rval_str = self._parenthesize_if(n.right,
                            lambda d: not self._is_simple_node(d))
        return '%s %s %s' % (lval_str, n.op, rval_str)

def visit_Assignment(self, n):
        rval_str = self._parenthesize_if(
                            n.rvalue,
                            lambda n: isinstance(n, c_ast.Assignment))
        return '%s %s %s' % (self.visit(n.lvalue), n.op, rval_str)

def visit_IdentifierType(self, n):
        return ' '.join(n.names)

def _visit_expr(self, n):
        if isinstance(n, c_ast.InitList):
            return '{' + self.visit(n) + '}'
        elif isinstance(n, c_ast.ExprList):
            return '(' + self.visit(n) + ')'
        else:
            return self.visit(n)

def visit_Decl(self, n, no_type=False):
        # no_type is used when a Decl is part of a DeclList, where the type is
        # explicitly only for the first declaration in a list.
        #
        s = n.name if no_type else self._generate_decl(n)
        if n.bitsize: s += ' : ' + self.visit(n.bitsize)
        if n.init:
            s += ' = ' + self._visit_expr(n.init)
        return s

def visit_DeclList(self, n):
        s = self.visit(n.decls[0])
        if len(n.decls) > 1:
            s += ', ' + ', '.join(self.visit_Decl(decl, no_type=True)
                                    for decl in n.decls[1:])
        return s

def visit_Typedef(self, n):
        s = ''
        if n.storage: s += ' '.join(n.storage) + ' '
        s += self._generate_type(n.type)
        return s

def visit_Cast(self, n):
        s = '(' + self._generate_type(n.to_type) + ')'
        return s + ' ' + self._parenthesize_unless_simple(n.expr)

def visit_ExprList(self, n):
        visited_subexprs = []
        for expr in n.exprs:
            visited_subexprs.append(self._visit_expr(expr))
        return ', '.join(visited_subexprs)

def visit_InitList(self, n):
        visited_subexprs = []
        for expr in n.exprs:
            visited_subexprs.append(self._visit_expr(expr))
        return ', '.join(visited_subexprs)

def visit_Enum(self, n):
        s = 'enum'
        if n.name: s += ' ' + n.name
        if n.values:
            s += ' {'
            for i, enumerator in enumerate(n.values.enumerators):
                s += enumerator.name
                if enumerator.value:
                    s += ' = ' + self.visit(enumerator.value)
                if i != len(n.values.enumerators) - 1:
                    s += ', '
            s += '}'
        return s

def visit_FuncDef(self, n):
        decl = self.visit(n.decl)
        self.indent_level = 0
        body = self.visit(n.body)
        if n.param_decls:
            knrdecls = ';\n'.join(self.visit(p) for p in n.param_decls)
            return decl + '\n' + knrdecls + ';\n' + body + '\n'
        else:
            return decl + '\n' + body + '\n'

def visit_FileAST(self, n):
        s = ''
        for ext in n.ext:
            if isinstance(ext, c_ast.FuncDef):
                s += self.visit(ext)
            else:
                s += self.visit(ext) + ';\n'
        return s

def visit_Compound(self, n):
        s = self._make_indent() + '{\n'
        self.indent_level += 2
        if n.block_items:
            s += ''.join(self._generate_stmt(stmt) for stmt in n.block_items)
        self.indent_level -= 2
        s += self._make_indent() + '}\n'
        return s

def visit_EmptyStatement(self, n):
        return ';'

def visit_ParamList(self, n):
        return ', '.join(self.visit(param) for param in n.params)

def visit_Return(self, n):
        s = 'return'
        if n.expr: s += ' ' + self.visit(n.expr)
        return s + ';'

def visit_Break(self, n):
        return 'break;'

def visit_Continue(self, n):
        return 'continue;'

def visit_TernaryOp(self, n):
        s = self._visit_expr(n.cond) + ' ? '
        s += self._visit_expr(n.iftrue) + ' : '
        s += self._visit_expr(n.iffalse)
        return s

def visit_If(self, n):
        s = 'if ('
        if n.cond: s += self.visit(n.cond)
        s += ')\n'
        s += self._generate_stmt(n.iftrue, add_indent=True)
        if n.iffalse:
            s += self._make_indent() + 'else\n'
            s += self._generate_stmt(n.iffalse, add_indent=True)
        return s

def visit_For(self, n):
        s = 'for ('
        if n.init: s += self.visit(n.init)
        s += ';'
        if n.cond: s += ' ' + self.visit(n.cond)
        s += ';'
        if n.next: s += ' ' + self.visit(n.next)
        s += ')\n'
        s += self._generate_stmt(n.stmt, add_indent=True)
        return s

def visit_While(self, n):
        s = 'while ('
        if n.cond: s += self.visit(n.cond)
        s += ')\n'
        s += self._generate_stmt(n.stmt, add_indent=True)
        return s

def visit_DoWhile(self, n):
        s = 'do\n'
        s += self._generate_stmt(n.stmt, add_indent=True)
        s += self._make_indent() + 'while ('
        if n.cond: s += self.visit(n.cond)
        s += ');'
        return s

def visit_Switch(self, n):
        s = 'switch (' + self.visit(n.cond) + ')\n'
        s += self._generate_stmt(n.stmt, add_indent=True)
        return s

def visit_Case(self, n):
        s = 'case ' + self.visit(n.expr) + ':\n'
        for stmt in n.stmts:
            s += self._generate_stmt(stmt, add_indent=True)
        return s

def visit_Default(self, n):
        s = 'default:\n'
        for stmt in n.stmts:
            s += self._generate_stmt(stmt, add_indent=True)
        return s

def visit_Label(self, n):
        return n.name + ':\n' + self._generate_stmt(n.stmt)

def visit_Goto(self, n):
        return 'goto ' + n.name + ';'

def visit_EllipsisParam(self, n):
        return '...'

def visit_Struct(self, n):
        return self._generate_struct_union(n, 'struct')

def visit_Typename(self, n):
        return self._generate_type(n.type)

def visit_Union(self, n):
        return self._generate_struct_union(n, 'union')

def visit_NamedInitializer(self, n):
        s = ''
        for name in n.name:
            if isinstance(name, c_ast.ID):
                s += '.' + name.name
            elif isinstance(name, c_ast.Constant):
                s += '[' + name.value + ']'
        s += ' = ' + self.visit(n.expr)
        return s

def visit_FuncDecl(self, n):
        return self._generate_type(n)

def _generate_struct_union(self, n, name):
        """ Generates code for structs and unions. name should be either
            'struct' or union.
        """
        s = name + ' ' + (n.name or '')
        if n.decls:
            s += '\n'
            s += self._make_indent()
            self.indent_level += 2
            s += '{\n'
            for decl in n.decls:
                s += self._generate_stmt(decl)
            self.indent_level -= 2
            s += self._make_indent() + '}'
        return s

def _generate_stmt(self, n, add_indent=False):
        """ Generation from a statement node. This method exists as a wrapper
            for individual visit_* methods to handle different treatment of
            some statements in this context.
        """
        typ = type(n)
        if add_indent: self.indent_level += 2
        indent = self._make_indent()
        if add_indent: self.indent_level -= 2

if typ in (
                c_ast.Decl, c_ast.Assignment, c_ast.Cast, c_ast.UnaryOp,
                c_ast.BinaryOp, c_ast.TernaryOp, c_ast.FuncCall, c_ast.ArrayRef,
                c_ast.StructRef, c_ast.Constant, c_ast.ID, c_ast.Typedef,
                c_ast.ExprList):
            # These can also appear in an expression context so no semicolon
            # is added to them automatically
            #
            return indent + self.visit(n) + ';\n'
        elif typ in (c_ast.Compound,):
            # No extra indentation required before the opening brace of a
            # compound - because it consists of multiple lines it has to
            # compute its own indentation.
            #
            return self.visit(n)
        else:
            return indent + self.visit(n) + '\n'

def _generate_decl(self, n):
        """ Generation from a Decl node.
        """
        s = ''
        if n.funcspec: s = ' '.join(n.funcspec) + ' '
        if n.storage: s += ' '.join(n.storage) + ' '
        s += self._generate_type(n.type)
        return s

def _generate_type(self, n, modifiers=[]):
        """ Recursive generation from a type node. n is the type node.
            modifiers collects the PtrDecl, ArrayDecl and FuncDecl modifiers
            encountered on the way down to a TypeDecl, to allow proper
            generation from it.
        """
        typ = type(n)
        #~ print(n, modifiers)

if typ == c_ast.TypeDecl:
            s = ''
            if n.quals: s += ' '.join(n.quals) + ' '
            s += self.visit(n.type)

nstr = n.declname if n.declname else ''
            # Resolve modifiers.
            # Wrap in parens to distinguish pointer to array and pointer to
            # function syntax.
            #
            for i, modifier in enumerate(modifiers):
                if isinstance(modifier, c_ast.ArrayDecl):
                    if (i != 0 and isinstance(modifiers[i - 1], c_ast.PtrDecl)):
                        nstr = '(' + nstr + ')'
                    nstr += '[' + self.visit(modifier.dim) + ']'
                elif isinstance(modifier, c_ast.FuncDecl):
                    if (i != 0 and isinstance(modifiers[i - 1], c_ast.PtrDecl)):
                        nstr = '(' + nstr + ')'
                    nstr += '(' + self.visit(modifier.args) + ')'
                elif isinstance(modifier, c_ast.PtrDecl):
                    if modifier.quals:
                        nstr = '* %s %s' % (' '.join(modifier.quals), nstr)
                    else:
                        nstr = '*' + nstr
            if nstr: s += ' ' + nstr
            return s
        elif typ == c_ast.Decl:
            return self._generate_decl(n.type)
        elif typ == c_ast.Typename:
            return self._generate_type(n.type)
        elif typ == c_ast.IdentifierType:
            return ' '.join(n.names) + ' '
        elif typ in (c_ast.ArrayDecl, c_ast.PtrDecl, c_ast.FuncDecl):
            return self._generate_type(n.type, modifiers + [n])
        else:
            return self.visit(n)

def _parenthesize_if(self, n, condition):
        """ Visits 'n' and returns its string representation, parenthesized
            if the condition function applied to the node returns True.
        """
        s = self._visit_expr(n)
        if condition(n):
            return '(' + s + ')'
        else:
            return s

def _parenthesize_unless_simple(self, n):
        """ Common use case for _parenthesize_if
        """
        return self._parenthesize_if(n, lambda d: not self._is_simple_node(d))

def _is_simple_node(self, n):
        """ Returns True for nodes that are "simple" - i.e. nodes that always
            have higher precedence than operators.
        """
        return isinstance(n,(   c_ast.Constant, c_ast.ID, c_ast.ArrayRef,
                                c_ast.StructRef, c_ast.FuncCall))

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