1 files changed, 123 insertions, 0 deletions
diff --git a/debugger/system_routine/pre_cpp.py b/debugger/system_routine/pre_cpp.py
new file mode 100755
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+++ b/debugger/system_routine/pre_cpp.py
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+#!/usr/bin/env python3
+
+# Copyright © 2011 Intel Corporation
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice (including the next
+# paragraph) shall be included in all copies or substantial portions of the
+# Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+#
+# Authors:
+#    Ben Widawsky <ben@bwidawsk.net>
+
+#very limited C-like preprocessor
+
+#limitations:
+# no macro substitutions
+# no multiline definitions
+# divide operator is //
+
+import sys,re
+
+file = open(sys.argv[1], "r")
+
+lines = file.readlines()
+len(lines)
+out = dict()
+defines = dict()
+
+count = 0
+#create a dict for our output
+for line in lines:
+    out[count] = line
+    count = count + 1
+
+#done is considered #define <name> <number>
+def is_done(string):
+    m = re.match("#define\s+(\w+?)\s+([a-fA-F0-9\-]+?)\s*$", string)
+    return m
+
+#skip macros, the real cpp will handle it
+def skip(string):
+    #macro
+    m = re.match("#define\s+\w+\(.+", string)
+    return m != None
+
+#put contants which are done being evaluated into the dictionary
+def easy_constants():
+    ret = 0
+    for lineno, string in out.items():
+        if skip(string):
+            continue
+        m = is_done(string)
+        if m != None:
+            key = m.group(1)
+            value = m.group(2)
+            if not key in defines:
+                    defines[key] = int(eval(value))
+                    ret = 1
+    return ret
+
+#replace names with dictionary values
+def simple_replace():
+    ret = 0
+    for lineno, string in out.items():
+        if skip(string):
+            continue
+        for key, value in defines.items():
+            if is_done(string):
+                continue
+            s = re.subn(key, repr(value), string)
+            if s[1] > 0:
+                out[lineno] = s[0]
+                ret = s[1]
+    return ret
+
+#evaluate expressions to try to simplify them
+def collapse_constants():
+    ret = 0
+    for lineno, string in out.items():
+        if skip(string):
+            continue
+        if is_done(string):
+            continue
+        m = re.match("#define\s+(.+?)\s+(.+)$", string)
+        if m != None:
+            try:
+                out[lineno] = "#define " + m.group(1) + " " + repr(eval(m.group(2)))
+                ret = 1
+            except NameError as ne:
+                #this happens before a variable is resolved in simple_replace
+                continue
+            except SyntaxError:
+                #this happens with something like #define foo bar, which the
+                #regular cpp can handle
+                continue
+            except:
+                raise KeyboardInterrupt
+    return ret;
+
+while True:
+    ret = 0
+    ret += easy_constants()
+    ret += simple_replace()
+    ret += collapse_constants()
+    if ret == 0:
+        break;
+
+for lineno, string in out.items():
+    print(string.rstrip())