#!/usr/bin/env python # Copyright (c) 2012 The Chromium Authors. All rights reserved. # Use of this source code is governed by a BSD-style license that can be # found in the LICENSE file. """Generator for Pnacl Shim functions that bridges the calling conventions between GCC and PNaCl. """ from datetime import datetime import difflib import glob import os import sys from idl_c_proto import CGen from idl_gen_wrapper import Interface, WrapperGen from idl_log import ErrOut, InfoOut, WarnOut from idl_option import GetOption, Option, ParseOptions from idl_parser import ParseFiles Option('pnaclshim', 'Name of the pnacl shim file.', default='temp_pnacl_shim.c') Option('disable_pnacl_opt', 'Turn off optimization of pnacl shim.') class PnaclGen(WrapperGen): """PnaclGen generates shim code to bridge the Gcc ABI with PNaCl. This subclass of WrapperGenerator takes the IDL sources and generates shim methods for bridging the calling conventions between GCC and PNaCl (LLVM). Some of the PPAPI methods do not need shimming, so this will also detect those situations and provide direct access to the original PPAPI methods (rather than the shim methods). """ def __init__(self): WrapperGen.__init__(self, 'Pnacl', 'Pnacl Shim Gen', 'pnacl', 'Generate the PNaCl shim.') self.cgen = CGen() self._skip_opt = False self._pnacl_attribute = '__attribute__((pnaclcall))' ############################################################ def OwnHeaderFile(self): """Return the header file that specifies the API of this wrapper. We do not generate the header files. """ return 'ppapi/generators/pnacl_shim.h' def GetGuardStart(self): return ('\n/* The PNaCl PPAPI shims are only needed on x86-64 and arm. */\n' '#if defined(__x86_64__) || defined(__arm__)\n\n') def GetGuardEnd(self): return '\n#endif\n' def InterfaceNeedsWrapper(self, iface, releases): """Return true if the interface has ANY methods that need wrapping. """ if self._skip_opt: return True for release in iface.GetUniqueReleases(releases): version = iface.GetVersion(release) if self.InterfaceVersionNeedsWrapping(iface, version): return True return False def InterfaceVersionNeedsWrapping(self, iface, version): """Return true if the interface+version has ANY methods that need wrapping. """ if self._skip_opt: return True for member in iface.GetListOf('Member'): release = member.GetRelease(version) if self.MemberNeedsWrapping(member, release): return True return False def MemberNeedsWrapping(self, member, release): """Return true if a particular member function at a particular release needs wrapping. """ if self._skip_opt: return True if not member.InReleases([release]): return False ret, name, array, args_spec = self.cgen.GetComponents(member, release, 'store') return self.TypeNeedsWrapping(ret, []) or self.ArgsNeedWrapping(args_spec) def ArgsNeedWrapping(self, args): """Return true if any parameter in the list needs wrapping. """ for arg in args: (type_str, name, array_dims, more_args) = arg if self.TypeNeedsWrapping(type_str, array_dims): return True return False def TypeNeedsWrapping(self, type_node, array_dims): """Return true if a parameter type needs wrapping. Currently, this is true for byval aggregates. """ is_aggregate = type_node.startswith('struct') or \ type_node.startswith('union') is_reference = (type_node.find('*') != -1 or array_dims != []) return is_aggregate and not is_reference ############################################################ def GenerateWrapperForPPBMethod(self, iface, member): result = [] func_prefix = self.WrapperMethodPrefix(iface.node, iface.release) sig = self.cgen.GetSignature(member, iface.release, 'store', func_prefix, False) result.append('static %s\n%s {\n' % (self._pnacl_attribute, sig)) result.append(' const struct %s *iface = %s.real_iface;\n' % (iface.struct_name, self.GetWrapperInfoName(iface))) ret, name, array, cspec = self.cgen.GetComponents(member, iface.release, 'store') ret_str, args_str = self.GetReturnArgs(ret, cspec) result.append(' %siface->%s(%s);\n}\n\n' % (ret_str, member.GetName(), args_str)) return result def GenerateWrapperForPPPMethod(self, iface, member): result = [] func_prefix = self.WrapperMethodPrefix(iface.node, iface.release) sig = self.cgen.GetSignature(member, iface.release, 'store', func_prefix, False) result.append('static %s {\n' % sig) result.append(' const struct %s *iface = %s.real_iface;\n' % (iface.struct_name, self.GetWrapperInfoName(iface))) temp_fp = self.cgen.GetSignature(member, iface.release, 'return', 'temp_fp', func_as_ptr=True, ptr_prefix=self._pnacl_attribute + ' ', include_name=False) cast = self.cgen.GetSignature(member, iface.release, 'return', prefix='', func_as_ptr=True, ptr_prefix=self._pnacl_attribute + ' ', include_name=False) result.append(' %s = ((%s)iface->%s);\n' % (temp_fp, cast, member.GetName())) ret, name, array, cspec = self.cgen.GetComponents(member, iface.release, 'store') ret_str, args_str = self.GetReturnArgs(ret, cspec) result.append(' %stemp_fp(%s);\n}\n\n' % (ret_str, args_str)) return result def GenerateRange(self, ast, releases, options): """Generate shim code for a range of releases. """ self._skip_opt = GetOption('disable_pnacl_opt') self.SetOutputFile(GetOption('pnaclshim')) return WrapperGen.GenerateRange(self, ast, releases, options) pnaclgen = PnaclGen() ###################################################################### # Tests. # Clean a string representing an object definition and return then string # as a single space delimited set of tokens. def CleanString(instr): instr = instr.strip() instr = instr.split() return ' '.join(instr) def PrintErrorDiff(old, new): oldlines = old.split(';') newlines = new.split(';') d = difflib.Differ() diff = d.compare(oldlines, newlines) ErrOut.Log('Diff is:\n%s' % '\n'.join(diff)) def GetOldTestOutput(ast): # Scan the top-level comments in the IDL file for comparison. old = [] for filenode in ast.GetListOf('File'): for node in filenode.GetChildren(): instr = node.GetOneOf('Comment') if not instr: continue instr.Dump() old.append(instr.GetName()) return CleanString(''.join(old)) def TestFiles(filenames, test_releases): ast = ParseFiles(filenames) iface_releases = pnaclgen.DetermineInterfaces(ast, test_releases) new_output = CleanString(pnaclgen.GenerateWrapperForMethods( iface_releases, comments=False)) old_output = GetOldTestOutput(ast) if new_output != old_output: PrintErrorDiff(old_output, new_output) ErrOut.Log('Failed pnacl generator test.') return 1 else: InfoOut.Log('Passed pnacl generator test.') return 0 def Main(args): filenames = ParseOptions(args) test_releases = ['M13', 'M14', 'M15'] if not filenames: idldir = os.path.split(sys.argv[0])[0] idldir = os.path.join(idldir, 'test_gen_pnacl', '*.idl') filenames = glob.glob(idldir) filenames = sorted(filenames) if GetOption('test'): # Run the tests. return TestFiles(filenames, test_releases) # Otherwise, generate the output file (for potential use as golden file). ast = ParseFiles(filenames) return pnaclgen.GenerateRange(ast, test_releases, filenames) if __name__ == '__main__': retval = Main(sys.argv[1:]) sys.exit(retval)