utils/llvm-build/llvmbuild/main.py

   1 import os
   2 import sys
   3
   4 import componentinfo
   5
   6 from util import *
   7
   8 ###
   9
  10 class LLVMProjectInfo(object):
  11     @staticmethod
  12     def load_infos_from_path(llvmbuild_source_root):
  13         # FIXME: Implement a simple subpath file list cache, so we don't restat
  14         # directories we have already traversed.
  15
  16         # First, discover all the LLVMBuild.txt files.
  17         for dirpath,dirnames,filenames in os.walk(llvmbuild_source_root,
  18                                                   followlinks = True):
  19             # If there is no LLVMBuild.txt file in a directory, we don't recurse
  20             # past it. This is a simple way to prune our search, although it
  21             # makes it easy for users to add LLVMBuild.txt files in places they
  22             # won't be seen.
  23             if 'LLVMBuild.txt' not in filenames:
  24                 del dirnames[:]
  25                 continue
  26
  27             # Otherwise, load the LLVMBuild file in this directory.
  28             assert dirpath.startswith(llvmbuild_source_root)
  29             subpath = '/' + dirpath[len(llvmbuild_source_root)+1:]
  30             llvmbuild_path = os.path.join(dirpath, 'LLVMBuild.txt')
  31             for info in componentinfo.load_from_path(llvmbuild_path, subpath):
  32                 yield info
  33
  34     @staticmethod
  35     def load_from_path(source_root, llvmbuild_source_root):
  36         infos = list(
  37             LLVMProjectInfo.load_infos_from_path(llvmbuild_source_root))
  38
  39         return LLVMProjectInfo(source_root, infos)
  40
  41     def __init__(self, source_root, component_infos):
  42         # Store our simple ivars.
  43         self.source_root = source_root
  44         self.component_infos = component_infos
  45
  46         # Create the component info map and validate that component names are
  47         # unique.
  48         self.component_info_map = {}
  49         for ci in component_infos:
  50             existing = self.component_info_map.get(ci.name)
  51             if existing is not None:
  52                 # We found a duplicate component name, report it and error out.
  53                 fatal("found duplicate component %r (at %r and %r)" % (
  54                         ci.name, ci.subpath, existing.subpath))
  55             self.component_info_map[ci.name] = ci
  56
  57         # Topologically order the component information according to their
  58         # component references.
  59         def visit_component_info(ci, current_stack, current_set):
  60             # Check for a cycles.
  61             if ci in current_set:
  62                 # We found a cycle, report it and error out.
  63                 cycle_description = ' -> '.join(
  64                     '%r (%s)' % (ci.name, relation)
  65                     for relation,ci in current_stack)
  66                 fatal("found cycle to %r after following: %s -> %s" % (
  67                         ci.name, cycle_description, ci.name))
  68
  69             # If we have already visited this item, we are done.
  70             if ci not in components_to_visit:
  71                 return
  72
  73             # Otherwise, mark the component info as visited and traverse.
  74             components_to_visit.remove(ci)
  75
  76             for relation,referent_name in ci.get_component_references():
  77                 # Validate that the reference is ok.
  78                 referent = self.component_info_map.get(referent_name)
  79                 if referent is None:
  80                     fatal("component %r has invalid reference %r (via %r)" % (
  81                             ci.name, referent_name, relation))
  82
  83                 # Visit the reference.
  84                 current_stack.append((relation,ci))
  85                 current_set.add(ci)
  86                 visit_component_info(referent, current_stack, current_set)
  87                 current_set.remove(ci)
  88                 current_stack.pop()
  89
  90             # Finally, add the component info to the ordered list.
  91             self.ordered_component_infos.append(ci)
  92
  93         self.ordered_component_infos = []
  94         components_to_visit = set(component_infos)
  95         while components_to_visit:
  96             visit_component_info(iter(components_to_visit).next(), [], set())
  97
  98 def main():
  99     from optparse import OptionParser, OptionGroup
 100     parser = OptionParser("usage: %prog [options]")
 101     parser.add_option("", "--source-root", dest="source_root", metavar="PATH",
 102                       help="Path to the LLVM source (inferred if not given)",
 103                       action="store", default=None)
 104     parser.add_option(
 105         "", "--llvmbuild-source-root", dest="llvmbuild_source_root",
 106         help="If given, an alternate path to search for LLVMBuild.txt files",
 107         action="store", default=None, metavar="PATH")
 108     (opts, args) = parser.parse_args()
 109
 110     # Determine the LLVM source path, if not given.
 111     source_root = opts.source_root
 112     if source_root:
 113         if not os.path.exists(os.path.join(source_root, 'lib', 'VMCore',
 114                                            'Function.cpp')):
 115             parser.error('invalid LLVM source root: %r' % source_root)
 116     else:
 117         llvmbuild_path = os.path.dirname(__file__)
 118         llvm_build_path = os.path.dirname(llvmbuild_path)
 119         utils_path = os.path.dirname(llvm_build_path)
 120         source_root = os.path.dirname(utils_path)
 121         if not os.path.exists(os.path.join(source_root, 'lib', 'VMCore',
 122                                            'Function.cpp')):
 123             parser.error('unable to infer LLVM source root, please specify')
 124
 125     # Construct the LLVM project information.
 126     llvmbuild_source_root = opts.llvmbuild_source_root or source_root
 127     project_info = LLVMProjectInfo.load_from_path(
 128         source_root, llvmbuild_source_root)
 129
 130 if __name__=='__main__':
 131     main()