On 05/10/16 20:25, Patrick Lehmann wrote:
Hello,I think, if an interface is required, it should export a DOM not the AST. ASTs are parser specific and hard to read. I don't know the AST of GHDL, but I had to use other ASTs which needed a lot of work to read/parse them. The lately announced pyVHDLParser has a VHDL DOM (Document Object Model). This model is fixed for VHDL-2008 and does not depend on the parser. So other parsers could generate the same model. It's simple to translate this model to Ada or C. A DOM doesn't containt resolve names or types, it's a compact in-memory representation of a single VHDL file. It comes with methods to find information like GetObjectOfLabel("baz"). document o- entity o- name: "foo" o- libraries o- "ieee" o- uses o- "ieee.std_logic_1164.all" o- "ieee.numeric_std.all" o- ports o- port o- name: "clk" o- type: "std_logic" o- architecture o- name: "rtl" o- entity: "foo" o- libraries o- uses o- declared-items o- constant o- name: "bar" o- type: "integer" o- init-value: 5 This could also be exported as XML, JSON, ... My model for pyVHDLParser is still in development, but one can look into the code and get an impression of a DOM: https://github.com/Paebbels/pyVHDLParser/blob/master/pyVHDLParser/Model/VHDLModel.py Sorry I have no picture available, but running the Frontend.py with simple_1.vhdl in mode 32 would present a first translation into the mentioned DOM :). Such a DOM could already be useful for many applications, but most of the emails here demand for a complete design model ... It should also be possible to generate a resolved model. So multiple files are combined, symbols are resolved, constants are propagated and e.g. unused generate statements are removed. I hope I can show results for that design model in a few weeks :). @Tristan: Has GHDL such a DOM? How complex is it to translate the internal structure to such a DOM?
If you look at disp_vhdl, this module is able to reprint vhdl sources from the AST. So generating the above DOM shouldn't be very difficult.
Tristan. _______________________________________________ Ghdl-discuss mailing list Ghdl-discuss@gna.org https://mail.gna.org/listinfo/ghdl-discuss
