[Mangler] Emit auto-generated constants as 'const'.

Author: nadavrot

lib/ABI/CBCTables.h

@@ -7,8 +7,8 @@ using APInt = llvm::APInt;
 // Processing text files: CBC_Compressed.txt.cbc
 namespace Huffman {
 // The charset that the fragment indices can use:
-unsigned CharsetLength = 64;
-unsigned LongestEncodingLength = 8;
+const unsigned CharsetLength = 64;
+const unsigned LongestEncodingLength = 8;
 const char *Charset = "0123456789_abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ$";
 char variable_decode(APInt &num) {
  uint64_t tailbits = *num.getRawData();

lib/ABI/HuffTables.h

@@ -130,13 +130,13 @@ def generate(self, depth):
 
 print "namespace CBC {"
 print "// The charset that the fragment indices can use:"
-print "unsigned CharsetLength = %d;" % len(charset)
+print "const unsigned CharsetLength = %d;" % len(charset)
 print "const char *Charset = \"%s\";" % charset
 print "const int IndexOfChar[] =  {", ",".join(index_of_char),"};"
 print "const char EscapeChar0 = '%s';" % escape_char0
 print "const char EscapeChar1 = '%s';" % escape_char1
 print "// The Fragments:"
-print "unsigned NumFragments = ", len(string_key_list), ";"
+print "const unsigned NumFragments = ", len(string_key_list), ";"
 print "const char* CodeBook[] = {", ",".join(string_key_list),"};"
 print "const unsigned CodeBookLen[] = {", ",".join(string_length_table),"};"
 print TrieHead.generateHeader()

utils/name-compression/CBCGen.py

@@ -116,8 +116,8 @@ def generate_encoder(self, stack):
 print "// Processing text files:", " ".join([os.path.basename(f) for f in filenames])
 print "namespace Huffman {"
 print "// The charset that the fragment indices can use:"
-print "unsigned CharsetLength = %d;" % len(charset)
-print "unsigned LongestEncodingLength = %d;" % (nodes[0].getMaxEncodingLength())
+print "const unsigned CharsetLength = %d;" % len(charset)
+print "const unsigned LongestEncodingLength = %d;" % (nodes[0].getMaxEncodingLength())
 print "const char *Charset = \"%s\";" % charset
 print "char variable_decode(APInt &num) {\n uint64_t tailbits = *num.getRawData();\n", nodes[0].generate_decoder(0), "\n assert(false); return 0;\n}"
 print "void variable_encode(uint64_t &bits, uint64_t &num_bits, char ch) {\n", nodes[0].generate_encoder([]),"assert(false);\n}"