llvm-build: Sketch code to load LLVMBuild.txt files.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@143621 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 134 insertions, 0 deletions

diff --git a/utils/llvm-build/llvmbuild/componentinfo.py b/utils/llvm-build/llvmbuild/componentinfo.py
new file mode 100644
index 0000000..a434bd8
--- /dev/null
+++ b/utils/llvm-build/llvmbuild/componentinfo.py
@@ -0,0 +1,134 @@
+"""
+Descriptor objects for entities that are part of the LLVM project.
+"""
+
+import ConfigParser
+import sys
+
+class ComponentInfo(object):
+    """
+    Base class for component descriptions.
+    """
+
+    type_name = None
+
+    def __init__(self, subpath, name, dependencies, parent):
+        if not subpath.startswith('/'):
+            raise ValueError,"invalid subpath: %r" % subpath
+        self.subpath = subpath
+        self.name = name
+        self.dependencies = list(dependencies)
+
+        # The name of the parent component to logically group this component
+        # under.
+        self.parent = parent
+
+class GroupComponentInfo(ComponentInfo):
+    """
+    Group components have no semantics as far as the build system are concerned,
+    but exist to help organize other components into a logical tree structure.
+    """
+
+    type_name = 'Group'
+
+    def __init__(self, subpath, name, parent):
+        ComponentInfo.__init__(self, subpath, name, [], parent)
+
+class LibraryComponentInfo(ComponentInfo):
+    type_name = 'Library'
+
+    def __init__(self, subpath, name, dependencies, parent, library_name = None,
+                 required_libraries = [], add_to_library_groups = []):
+        ComponentInfo.__init__(self, subpath, name, dependencies, parent)
+
+        # If given, the name to use for the library instead of deriving it from
+        # the component name.
+        self.library_name = library_name
+
+        # The names of the library components which are required when linking
+        # with this component.
+        self.required_libraries = list(required_libraries)
+
+        # The names of the library group components this component should be
+        # considered part of.
+        self.add_to_library_groups = list(add_to_library_groups)
+
+class LibraryGroupComponentInfo(ComponentInfo):
+    type_name = 'LibraryGroup'
+
+    def __init__(self, subpath, name, parent, required_libraries = [],
+                 add_to_library_groups = []):
+        ComponentInfo.__init__(self, subpath, name, [], parent)
+
+        # The names of the library components which are required when linking
+        # with this component.
+        self.required_libraries = list(required_libraries)
+
+        # The names of the library group components this component should be
+        # considered part of.
+        self.add_to_library_groups = list(add_to_library_groups)
+
+class ToolComponentInfo(ComponentInfo):
+    type_name = 'Tool'
+
+    def __init__(self, subpath, name, dependencies, parent,
+                 required_libraries = []):
+        ComponentInfo.__init__(self, subpath, name, dependencies, parent)
+
+        # The names of the library components which are required to link this
+        # tool.
+        self.required_libraries = list(required_libraries)
+
+class BuildToolComponentInfo(ToolComponentInfo):
+    type_name = 'BuildTool'
+
+_component_type_map = dict(
+    (t.type_name, t)
+    for t in (GroupComponentInfo,
+              LibraryComponentInfo, LibraryGroupComponentInfo,
+              ToolComponentInfo, BuildToolComponentInfo))
+def load_from_path(path, subpath):
+    # Load the LLVMBuild.txt file as an .ini format file.
+    parser = ConfigParser.RawConfigParser()
+    parser.read(path)
+
+    # We load each section which starts with 'component' as a distinct component
+    # description (so multiple components can be described in one file).
+    for section in parser.sections():
+        if not section.startswith('component'):
+            # We don't expect arbitrary sections currently, warn the user.
+            print >>sys.stderr, "warning: ignoring unknown section %r in %r" % (
+                section, path)
+            continue
+
+        # Load the component that this section describes. For now we just do
+        # this the trivial way by letting python validate the argument
+        # assignment. This is simple, but means users see lame diagnostics. We
+        # should audit the component manually, eventually.
+        if not parser.has_option(section, 'type'):
+            print >>sys.stderr, "error: invalid component %r in %r: %s" % (
+                section, path, "no component type")
+            raise SystemExit, 1
+
+        type_name = parser.get(section, 'type')
+        type_class = _component_type_map.get(type_name)
+        if type_class is None:
+            print >>sys.stderr, "error: invalid component %r in %r: %s" % (
+                section, path, "invalid component type: %r" % type_name)
+            raise SystemExit, 1
+
+        items = dict(parser.items(section))
+        items['subpath'] = subpath
+        items.pop('type')
+
+        # Instantiate the component based on the remaining values.
+        try:
+            info = type_class(**items)
+        except TypeError:
+            print >>sys.stderr, "error: invalid component %r in %r: %s" % (
+                section, path, "unable to instantiate: %r" % type_name)
+            import traceback
+            traceback.print_exc()
+            raise SystemExit, 1
+
+        yield info