tools: implement linker script generation

tools/ldgen/sdkconfig.py

@@ -0,0 +1,87 @@
+#!/usr/bin/env python
+#
+# Copyright 2018-2019 Espressif Systems (Shanghai) PTE LTD
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+import os
+from pyparsing import *
+
+import sys
+parent_dir_name = os.path.dirname(os.path.dirname(os.path.realpath(__file__)))
+kconfig_new_dir = os.path.abspath(parent_dir_name + "/kconfig_new")
+sys.path.append(kconfig_new_dir)
+import kconfiglib
+
+
+
+"""
+Encapsulates an sdkconfig file. Defines grammar of a configuration entry, and enables
+evaluation of logical expressions involving those entries.
+"""
+class SDKConfig:
+
+    # A configuration entry is in the form CONFIG=VALUE. Definitions of components of that grammar
+    IDENTIFIER = Word(printables.upper())
+
+    HEX = Combine("0x" + Word(hexnums)).setParseAction(lambda t:int(t[0], 16))
+    DECIMAL = Combine(Optional(Literal("+") | Literal("-")) + Word(nums)).setParseAction(lambda t:int(t[0]))
+    LITERAL =  Word(printables)
+    QUOTED_LITERAL = quotedString.setParseAction(removeQuotes)
+
+    VALUE = HEX | DECIMAL | LITERAL | QUOTED_LITERAL
+
+    # Operators supported by the expression evaluation
+    OPERATOR = oneOf(["=", "!=", ">", "<", "<=", ">="])
+
+    def __init__(self, kconfig_file, sdkconfig_file, env = []):
+        env = [ (name, value) for (name,value) in ( e.split("=",1) for e in env) ]
+
+        for name, value in env:
+            value = " ".join(value.split())
+            os.environ[name] = value
+
+        self.config = kconfiglib.Kconfig(kconfig_file.name)
+        self.config.load_config(sdkconfig_file.name)
+
+    def evaluate_expression(self, expression):
+        result = self.config.eval_string(expression)
+
+        if result == 0: # n
+            return False
+        elif result == 2: # y
+            return True
+        else: # m
+            raise Exception("Unsupported config expression result.")
+
+    @staticmethod
+    def get_expression_grammar():
+        identifier = SDKConfig.IDENTIFIER.setResultsName("identifier")
+        operator = SDKConfig.OPERATOR.setResultsName("operator")
+        value = SDKConfig.VALUE.setResultsName("value")
+
+        test_binary = identifier + operator + value
+        test_single = identifier
+
+        test = test_binary | test_single
+
+        condition = Group(Optional("(").suppress() + test + Optional(")").suppress())
+
+        grammar = infixNotation(
+                condition, [
+                ("!", 1, opAssoc.RIGHT),
+                ("&&", 2, opAssoc.LEFT),
+                ("||",  2, opAssoc.LEFT)])
+
+        return grammar