28 lines
1 KiB
Plaintext
28 lines
1 KiB
Plaintext
|
This is a temporary directory used for yacc and lex intermediary
|
|||
|
|
files.
|
|||
|
|
|
|||
|
|
The component.mk controls the compilation. It does:
|
|||
|
|
|
|||
|
|
$ yacc -o $(COMPONENT_PATH)/yacclex/dbc_parser.cpp
|
|||
|
|
-d $(COMPONENT_PATH)/src/dbc_parser.y
|
|||
|
|
|
|||
|
|
The expectation here is that the ‘-o’ produces dbc_parser.cpp
|
|||
|
|
and dbs_parser.hpp
|
|||
|
|
|
|||
|
|
$ lex -o $(COMPONENT_PATH)/yacclex/dbc_tokeniser.c
|
|||
|
|
$(COMPONENT_PATH)/src/dbc_tokeniser.l
|
|||
|
|
|
|||
|
|
This #include the dbc_parser.hpp and produced dbc_tokeniser.c
|
|||
|
|
|
|||
|
|
Then dbc_tokeniser.c and dbc_parser.cpp are compiled as normal
|
|||
|
|
|
|||
|
|
We use ‘yacclex’ as a temporary path, to keep these auto-generated code
|
|||
|
|
files separate.
|
|||
|
|
|
|||
|
|
The behaviour of bison is that ‘-o’ outputs both .hpp and .cpp files
|
|||
|
|
(from the ‘-o’ directive). If think byacc may behave differently. We
|
|||
|
|
need both the header and code files, and they need to be named .hpp
|
|||
|
|
and .cpp as they need to produce c++ code. The dbc_tokeniser is in C,
|
|||
|
|
as Lex only really supports C and we can “extern C” the stuff we need
|
|||
|
|
when we access it (there is not much).
|