Is there the whole syntax tree information of free pascal at one place

[daniel_sap]

Do you know, if there is information with the whole syntax tree of free pascal at one place

Also, how many syntax trees there are.
I think for Windows, Linux, MacOS it is one,
but there is different for Motorola 68k, AVR

Event if it is not up to date information would be fine

Regards

[jamie]

You mean the help file?

[marcov]

I think he means a grammar, but yeah, the railroad diagrams in the docs are also related.

There is no formal grammar for FPC or Delphi. In case of FPC is because it is a recursive descent parser.

For delphi, older version's manuals had a grammar for documentation purposes. (and most Delphi grammars on the web are derived from that non production one)

[Thausand]

I think he means a grammar, but yeah, the railroad diagrams in the docs are also related.

Then I have question. Post write:

Also, how many syntax trees there are.
I think for Windows, Linux, MacOS it is one,
but there is different for Motorola 68k, AVR

Grammar (syntax tree) same for platform all, no ? Have result ASM differ ?

[daniel_sap]

I want to build a tree from the source code of one unit.
After that from this tree to generate the code again.

I think for code formatters they use it.
I don't think that Lazarus developers for example, they check the compiler code and write the formatter.
Or in Lazaurs main menu Source|Refactoring there is Unused units, Rename identifier, Extract procedure, they should build such a parse tree structure.

For me they should use some document, or some other approach, or may be they check the compiler code, or ask compiler developers...

[Thaddy]

https://github.com/rochus-keller/FreePascal
Been dabbling with that sometime ago and is the best yet. Do not use on trunk, though.
(And I wonder why he used C++, this could all be done in FreePascal. Seems he used some older project)

With fpc itself:
To get the parse tree, compile with -vp option. Generates a file called tree.log.
This is not enough to create a syntax tree for the whole language.
I have an adapted D7 grammar -for Gold -  that parses most, but not all constructs associated with {$mode delphi} if that helps, but that won't work for {$mode objfpc}
You may also want to look at the parser that Lazarus uses, which is a very modified version of mwparser.
You can also have a look at the Castalia parser wich also has roots in TmwParser. I have translated that to fpc, but also does not parse objfpc, only mode delphi.
I guess the Lazarus parser or fcl-passrc are your best options, besides the standard fpc-ebnf (with a grammar) and fcl-passrc packages.
fcl-passrc is used for pas2js and parses 99% or so.

[PascalDragon]

Also, how many syntax trees there are.
I think for Windows, Linux, MacOS it is one,
but there is different for Motorola 68k, AVR

Grammar (syntax tree) same for platform all, no ? Have result ASM differ ?

The (Object) Pascal syntax is not different between platforms (with very few exceptions like external classes for the JVM platform or register locations for syscall functions on Amiga-likes).

Also documenting the assembly syntax is not part of Free Pascal as it uses the syntax of the underlying platform assemblers. For that please refer to the platform's documentation.