How to start reading gcc source code.

How to start reading gcc source code.

[hgbasm]

I have posted my message here:

http://sourceforge.net/forum/forum.php?thread_id=1185705&forum_id=7134

a resposer of the messate

START----------------------------------------------------------------
Hi people. 
 
 
I will like to know how gcc select the compiler, I can trace a little in 
the code, also I need download flex and bison. 
 
I will like to analise the output of the parsing, like I have understand 
for this moment the output is a AST, I will like to know how to detect 
when the AST is complete and let my analise it, and dont go more far 
than that. 
 
 
Specifically I whant to identify: 
 
structs/unions 
typedefs 
#defines (and sure almost all the preprocessing done) 
and functions 
 
- Actually I can pass the switch -save-temps 
 
And this one show me: 
 
Functions and structures (I am running it in a .h file) I have renamed 
the file to extension .cpp, because when I pass the .h warn me about 
this... 
 
 
Anyway, any help posible for undertand the AST, and for stop in this 
place for let me analise (or find), or put out the AST, if both are 
posible I will like to see the drawbacks... 
 
 
 
 
---------------- 
 
Only a final thing, altought not necesary, I will like to know wich file 
are part of X pass, for example parsing, generation of AST, generation 
of RTL /(IR)?, optimizing, if you know about this, should be nice to 
share :D. 
 
Have a nice dy or night.

END-----------------------------------------------------------------------


Anyway I havent specificated that I only whant specially for interfacing 
porpuoses , ie, I only whant to process headers files for get: 
structs/unions and typedefs, numeric definitions (#define XTHING 3) , 
after I can recognogize that, pheraphs but not necesary, get a list of 
functions in each file.


What I whant to do?

I use nasm (not much at all), but if something is left is have a good 
and easy to put up to date include files.

A struct like:

struct X{
   int a,b;
};
typedef struct X OTHER1, *OTHER2;

should be translated to:

struc X
 .a resd
 .b resd
endstruc

struc OTHER1
 .a resd
 .b resd
endstruc

%define OTHER2 dd (because the size of a pointer is double word)

Also I will like at less a little about handle unicode for choice 
between A or U

Pheraphs group all the names that are repeated and the only character 
that is diferent is the one, and the last should be A or U, then I can 
group them.

And do

%if UNICODE
 %define MessageBox MessageBoxU
 ........
%else
 %define MessageBox MessageBoxA
......
%endif




I also whant to be distributed, ie not in a single include file, I whant 
that for each h file referenced in a file, there would be one in file 
produced (for maintaing this a little modularitized).



And that is what I whant to do at the end, a importer of headers 
structs, unions, flag defines and prototypes of functions for use them 
with nasm, I in fact only whant the info, not whant to generate actually 
machine code, optimization, etc, only the declarations.






Like you see I dont whant to go more far (for the moment) than the AST 
if Im correct for get this working.



Hope you have understood ;).




Have a nice day or night,

Re: How to start reading gcc source code.

[hgbasm]

Hi there people, I beed watching some options, also reading some things, 
now I know this:

C:\hgb_Progs\MinGW\include>gcc -c -save-temps -no-integrated-cpp 
-aux-info winoutt.txt windows.c
windows.c:16:13: warning: #pragma system_header ignored outside include file


With this are generated the following files:

winoutt.txt => contain the names of a serie of all the functions defined
windows.I => contains typedefs, enums, structs and some lines like:

# 1 "<command line>"
# 1 "windows.c"
# 47 "windows.c"
# 1 "C:/hgb_Progs/MinGW/include/stdarg.h" 1 3



# 1 "C:/hgb_Progs/MinGW/lib/gcc-lib/mingw32/3.2.3/include/stdarg.h" 1 3
# 44 "C:/hgb_Progs/MinGW/lib/gcc-lib/mingw32/3.2.3/include/stdarg.h" 3
typedef __builtin_va_list __gnuc_va_list;


Some one can explain me what they mean?, I guess that handle the depth 
level, but dont know how to read it......




I remember that with a switch I obtain a file with extension "II" 
instead of only "I" or was a espegism?




Now the only other thing that I whant to get are the defines :), is 
there a switch or a way I can get them?, like the file winoutt.txt 
generated with -aux-info


By the way, the other switch are redundant?, and what mean:

windows.c:16:13: warning: #pragma system_header ignored outside include file



If I can get the defines listed in such a beatifull way I will really be 
happy, and start coding a translator with some tool like antrl or some 
like that, pheraphs a hand tool one.



I have downloaded the full packege gcc 4. I have some what understand a 
little about  three.def/.c/.h, the instructions gived in 
http://gcc.gnu.org/install/ are sufficient to compile the entire package 
for win?, or should I ask mingw how they port it? (sorry for that question)

Another question related to the information, is suficient with read 
http://gcc.gnu.org/onlinedocs/ ? or I need to read more about how gcc work?