Diff: tools/hooks.py

Revision:

0:f782d9c66c49

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/hooks.py	Fri Feb 02 05:42:23 2018 +0000
@@ -0,0 +1,214 @@
+""" Configurable hooks in the build system. Can be used by various platforms
+to customize the build process.
+"""
+
+################################################################################
+# Hooks for the various parts of the build process
+
+# Internal mapping of hooks per tool
+_HOOKS = {}
+
+# Internal mapping of running hooks
+_RUNNING_HOOKS = {}
+
+# Available hook types
+_HOOK_TYPES = ["binary", "compile", "link", "assemble"]
+
+# Available hook steps
+_HOOK_STEPS = ["pre", "replace", "post"]
+
+# Hook the given function. Use this function as a decorator
+def hook_tool(function):
+    """Decorate a function as a tool that may be hooked"""
+    tool = function.__name__
+    tool_flag = "_" + tool + "_done"
+    def wrapper(t_self, *args, **kwargs):
+        """The hooked function itself"""
+        # if a hook for this tool is already running, it's most likely
+        # coming from a derived class, so don't hook the super class version
+        if _RUNNING_HOOKS.get(tool, False):
+            return function(t_self, *args, **kwargs)
+        _RUNNING_HOOKS[tool] = True
+        # If this tool isn't hooked, return original function
+        if not _HOOKS.has_key(tool):
+            res = function(t_self, *args, **kwargs)
+            _RUNNING_HOOKS[tool] = False
+            return res
+        tooldesc = _HOOKS[tool]
+        setattr(t_self, tool_flag, False)
+        # If there is a replace hook, execute the replacement instead
+        if tooldesc.has_key("replace"):
+            res = tooldesc["replace"](t_self, *args, **kwargs)
+        # If the replacement has set the "done" flag, exit now
+        # Otherwise continue as usual
+        if getattr(t_self, tool_flag, False):
+            _RUNNING_HOOKS[tool] = False
+            return res
+        # Execute pre-function before main function if specified
+        if tooldesc.has_key("pre"):
+            tooldesc["pre"](t_self, *args, **kwargs)
+        # Execute the main function now
+        res = function(t_self, *args, **kwargs)
+        # Execute post-function after main function if specified
+        if tooldesc.has_key("post"):
+            post_res = tooldesc["post"](t_self, *args, **kwargs)
+            _RUNNING_HOOKS[tool] = False
+            return post_res or res
+        else:
+            _RUNNING_HOOKS[tool] = False
+            return res
+    return wrapper
+
+class Hook(object):
+    """A compiler class that may be hooked"""
+    def __init__(self, target, toolchain):
+        _HOOKS.clear()
+        self._cmdline_hooks = {}
+        self.toolchain = toolchain
+        target.init_hooks(self, toolchain.__class__.__name__)
+
+    # Hook various functions directly
+    @staticmethod
+    def _hook_add(hook_type, hook_step, function):
+        """Add a hook to a compile function
+
+        Positional arguments:
+        hook_type - one of the _HOOK_TYPES
+        hook_step - one of the _HOOK_STEPS
+        function - the function to add to the list of hooks
+        """
+        if hook_type not in _HOOK_TYPES or hook_step not in _HOOK_STEPS:
+            return False
+        if hook_type not in _HOOKS:
+            _HOOKS[hook_type] = {}
+        _HOOKS[hook_type][hook_step] = function
+        return True
+
+    def hook_add_compiler(self, hook_step, function):
+        """Add a hook to the compiler
+
+        Positional Arguments:
+        hook_step - one of the _HOOK_STEPS
+        function - the function to add to the list of hooks
+        """
+        return self._hook_add("compile", hook_step, function)
+
+    def hook_add_linker(self, hook_step, function):
+        """Add a hook to the linker
+
+        Positional Arguments:
+        hook_step - one of the _HOOK_STEPS
+        function - the function to add to the list of hooks
+        """
+        return self._hook_add("link", hook_step, function)
+
+    def hook_add_assembler(self, hook_step, function):
+        """Add a hook to the assemble
+
+        Positional Arguments:
+        hook_step - one of the _HOOK_STEPS
+        function - the function to add to the list of hooks
+        """
+        return self._hook_add("assemble", hook_step, function)
+
+    def hook_add_binary(self, hook_step, function):
+        """Add a hook to the elf to binary tool
+
+        Positional Arguments:
+        hook_step - one of the _HOOK_STEPS
+        function - the function to add to the list of hooks
+        """
+        return self._hook_add("binary", hook_step, function)
+
+    # Hook command lines
+    def _hook_cmdline(self, hook_type, function):
+        """Add a hook to a command line function
+
+        Positional arguments:
+        hook_type - one of the _HOOK_TYPES
+        function - the function to add to the list of hooks
+        """
+        if hook_type not in _HOOK_TYPES:
+            return False
+        self._cmdline_hooks[hook_type] = function
+        return True
+
+    def hook_cmdline_compiler(self, function):
+        """Add a hook to the compiler command line
+
+        Positional arguments:
+        function - the function to call
+        """
+        return self._hook_cmdline("compile", function)
+
+    def hook_cmdline_linker(self, function):
+        """Add a hook to the linker command line
+
+        Positional arguments:
+        function - the function to call
+        """
+        return self._hook_cmdline("link", function)
+
+    def hook_cmdline_assembler(self, function):
+        """Add a hook to the assembler command line
+
+        Positional arguments:
+        function - the function to call
+        """
+        return self._hook_cmdline("assemble", function)
+
+    def hook_cmdline_binary(self, function):
+        """Add a hook to the elf to bin tool command line
+
+        Positional arguments:
+        function - the function to call
+        """
+        return self._hook_cmdline("binary", function)
+
+    # Return the command line after applying the hook
+    def _get_cmdline(self, hook_type, cmdline):
+        """Get the command line after running all hooks
+
+        Positional arguments:
+        hook_type - one of the _HOOK_TYPES
+        cmdline - the initial command line
+        """
+        if self._cmdline_hooks.has_key(hook_type):
+            cmdline = self._cmdline_hooks[hook_type](
+                self.toolchain.__class__.__name__, cmdline)
+        return cmdline
+
+    def get_cmdline_compiler(self, cmdline):
+        """Get the compiler command line after running all hooks
+
+        Positional arguments:
+        cmdline - the initial command line
+        """
+        return self._get_cmdline("compile", cmdline)
+
+    def get_cmdline_linker(self, cmdline):
+        """Get the linker command line after running all hooks
+
+        Positional arguments:
+        cmdline - the initial command line
+        """
+        return self._get_cmdline("link", cmdline)
+
+    def get_cmdline_assembler(self, cmdline):
+        """Get the assmebler command line after running all hooks
+
+        Positional arguments:
+        cmdline - the initial command line
+        """
+        return self._get_cmdline("assemble", cmdline)
+
+    def get_cmdline_binary(self, cmdline):
+        """Get the binary command line after running all hooks
+
+        Positional arguments:
+        cmdline - the initial command line
+        """
+        return self._get_cmdline("binary", cmdline)
+
+################################################################################
+