Code Generator

* Modify typechecker test cases to cover return type error

* Improve a boolean expression

* Add support for function rtype and prototype checking

* Condense Makefile

* Create scratch.c and scratch.h

* Create label.c and label.h

* Create codegen.c and codegen.h

* Protect type_print() from null pointer

* Implement decl_codegen()

* Implement symbol_codegen()

* Implement stmt_codegen()

* Implement expr_codegen()

* Format library.c

* Add --codegen option in bminor.c

* Add codegen_test

* Create codegen test cases

Introduce type-checker

* Move #include directives out of header files

* Improve function documenting in expr.h

* Redirect both stdout and stderr in runtest.sh

* Fix a typo in comment in lex.yy.l

* Add const quantifiers to arg of several functions

* Fix 2D array size not resolved issue

* Improve parsing logic in bminor.c

* Support function prototype resolving

* Cover function prototype and nested scope in resolver test cases

* Fix a bug that causes a resolve error printed to stdout

* Fix a bug that causes float literal not created correctly

* Extract get_operator() function

* Create typechecker.c and typechecker.h

* Define type_errors in type.h

* Implement type_equals()

* Implement expr_typecheck()

* Implement stmt_typecheck()

* Implement param_typecheck()

* Implement decl_typecheck() and type_typecheck()

* Add --typecheck option in bminor.c

* Create test cases for typechecker

* Add test-typecheck option in runtest.sh

* Refactor Makefile using macros

Introduce resolver

* Improve bminor.c readability

* Improve readability of Makefile

* Improve error handling in scanner and parser

* Fix assignment expression parsing issue

* Fix an issue in decl_print()

* Modify printer to directly print to stdout

* Change printer_test() in runtest.sh to use diff

* Add .tmp for testing output to .gitignore

* Create test cases for resolver

* Add test for resolver in runtest.sh

* Create symbol.c and symbol.h

* Create scope.c and scope.h

* Create resolver.c and resolver.h

* Implement decl_resolve()

* Implement stmt_resolve()

* Implement param_list_resolve()

* Implement expr_resolve()

* Add rules for resolver in Makefile

* Add --resolve option in bminor.c

* Fix no prototype warning in hash_table.c

Introduce printer

* Create test cases for printer

* Add printer test in runtest.sh

* Add --print option

* Add rules for printer and other improvements

* Create printer.c

* Define semantic values in lex.yy.l

* Modify parse() to support parsing consecutive files

* Modify parse() to return AST root

* Add actions after reduction in grammar.y

* Add param_list_create() and param_list_print()

* Add expr_create() and expr_print()

* Add type_create() and type_print()

* Add stmt_create() and stmt_print()

* Add decl_create() and decl_print()

* Pass file pointers to decode(), scan(), and parse()

* Modify parse() to take file pointer

* Modify scan() to take file pointer

* Modify decode() to take file pointer

* Move definition of MAX_STRING_LEN

* Add grammar.output to .gitignore

WIP

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