ast/BBHandler/build: Add support for removing tasks (deltask)

Back in the depths of time we did support task removal. In the pre
AST days it was nearly impossible to continue supporting it, it wasn't
used so it was dropped. With the modern codebase we can easily now support
deltask and it would be very useful within the metadata since it can
massively simplify dependency trees.

As an example, a core-image-sato had 47703 inter task dependencies before
this patch and a patch to native.bbclass, afterwards with the noexec tasks
deleted, we had 29883. Such a significant simplification is worthwhile
and justifies adding a deltask operation to the system.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/lib/bb/build.py b/lib/bb/build.py
index 92c45a38c90fce9a9064792607ce813b876d696e..6b395264b67c92ec5e31bd4bba01d7cf8f4224cb 100644 (file)
--- a/lib/bb/build.py
+++ b/lib/bb/build.py
@@ -622,7 +622,7 @@ def stampfile(taskname, d, file_name = None):
     """
     return stamp_internal(taskname, d, file_name)
 
-def add_tasks(tasklist, d):
+def add_tasks(tasklist, deltasklist, d):
     task_deps = d.getVar('_task_deps')
     if not task_deps:
         task_deps = {}
@@ -633,6 +633,10 @@ def add_tasks(tasklist, d):
 
     for task in tasklist:
         task = d.expand(task)
+
+        if task in deltasklist:
+            continue
+
         d.setVarFlag(task, 'task', 1)
 
         if not task in task_deps['tasks']:

diff --git a/lib/bb/parse/ast.py b/lib/bb/parse/ast.py
index d4b8b095430898ee7091012b3d374cef6f540d05..2036cd43fe834dc45d2d0da8cc625c9564cdb922 100644 (file)
--- a/lib/bb/parse/ast.py
+++ b/lib/bb/parse/ast.py
@@ -259,6 +259,21 @@ class AddTaskNode(AstNode):
                 if var not in existing:
                     data.setVarFlag(entry, "deps", [var] + existing)
 
+class DelTaskNode(AstNode):
+    def __init__(self, filename, lineno, func):
+        AstNode.__init__(self, filename, lineno)
+        self.func = func
+
+    def eval(self, data):
+        var = self.func
+        if self.func[:3] != "do_":
+            var = "do_" + self.func
+
+        bbtasks = data.getVar('__BBDELTASKS') or []
+        if not var in bbtasks:
+            bbtasks.append(var)
+        data.setVar('__BBDELTASKS', bbtasks)
+
 class BBHandlerNode(AstNode):
     def __init__(self, filename, lineno, fns):
         AstNode.__init__(self, filename, lineno)
@@ -309,6 +324,13 @@ def handleAddTask(statements, filename, lineno, m):
 
     statements.append(AddTaskNode(filename, lineno, func, before, after))
 
+def handleDelTask(statements, filename, lineno, m):
+    func = m.group("func")
+    if func is None:
+        return
+
+    statements.append(DelTaskNode(filename, lineno, func))
+
 def handleBBHandlers(statements, filename, lineno, m):
     statements.append(BBHandlerNode(filename, lineno, m.group(1)))
 
@@ -333,7 +355,8 @@ def finalize(fn, d, variant = None):
     bb.data.update_data(d)
 
     tasklist = d.getVar('__BBTASKS') or []
-    bb.build.add_tasks(tasklist, d)
+    deltasklist = d.getVar('__BBDELTASKS') or []
+    bb.build.add_tasks(tasklist, deltasklist, d)
 
     bb.parse.siggen.finalise(fn, d, variant)
 

diff --git a/lib/bb/parse/parse_py/BBHandler.py b/lib/bb/parse/parse_py/BBHandler.py
index 7cba64959526cfe7a291c9db502af90373119d2d..408890e48a30119adb469ad43913d518688efd4e 100644 (file)
--- a/lib/bb/parse/parse_py/BBHandler.py
+++ b/lib/bb/parse/parse_py/BBHandler.py
@@ -42,6 +42,7 @@ __func_start_regexp__    = re.compile( r"(((?P<py>python)|(?P<fr>fakeroot))\s*)*
 __inherit_regexp__       = re.compile( r"inherit\s+(.+)" )
 __export_func_regexp__   = re.compile( r"EXPORT_FUNCTIONS\s+(.+)" )
 __addtask_regexp__       = re.compile("addtask\s+(?P<func>\w+)\s*((before\s*(?P<before>((.*(?=after))|(.*))))|(after\s*(?P<after>((.*(?=before))|(.*)))))*")
+__deltask_regexp__       = re.compile("deltask\s+(?P<func>\w+)")
 __addhandler_regexp__    = re.compile( r"addhandler\s+(.+)" )
 __def_regexp__           = re.compile( r"def\s+(\w+).*:" )
 __python_func_regexp__   = re.compile( r"(\s+.*)|(^$)" )
@@ -243,6 +244,11 @@ def feeder(lineno, s, fn, root, statements):
         ast.handleAddTask(statements, fn, lineno, m)
         return
 
+    m = __deltask_regexp__.match(s)
+    if m:
+        ast.handleDelTask(statements, fn, lineno, m)
+        return
+
     m = __addhandler_regexp__.match(s)
     if m:
         ast.handleBBHandlers(statements, fn, lineno, m)