do_spec(), do_spec_x() and execute() in mygcc/gcc/gcc.c

["sean yang" <seanatpurdue at hotmail dot com>]

I am looking at the source code of gcc.c, and I found the driver function 
main.c calls do_spec(). It seems that do_spce() is the function, called by 
main(), which  invokes the preprocessor, compiler, assembler and linker 
individually at different step according to the input to the driver; and 
execute() is the function actually invoke them.  (I copy and past my gdb 
output with "bt" command.)

Can someone give a brief intro of what do_spec(), do_spec_x() and execute() 
do, so that I can follow the procedure?

A seperate but sort of related question is:
After looking at Makefile, I think toplev_main () in toplev.c (which is 
wrapped in main() in main.c)is compiled to cc1(i.e, $BACKEND), is it 
correct? But why can't I find cc1 in the mygcc/bin directory after make and 
make install?

Thanks for the help.

------------------------------------------------------------------------------------------------
Breakpoint 14, execute () at ../../gcc-4.0.2/gcc/gcc.c:2663
(gdb) bt
#0  execute () at ../../gcc-4.0.2/gcc/gcc.c:2663
#1  0x080504ee in do_spec_1 (spec=0x8e94648 "-o %|.s |\n as %(asm_options) 
%|.s %A", inswitch=0, soft_matched_part=0x0) at 
../../gcc-4.0.2/gcc/gcc.c:4532
#2  0x080528d6 in handle_braces (p=0x8059021 "-o %|.s |\n as %(asm_options) 
%|.s %A }") at ../../gcc-4.0.2/gcc/gcc.c:5706
#3  0x08050b63 in do_spec_1 (spec=0x805901c "%{!S:-o %|.s |\n as 
%(asm_options) %|.s %A }", inswitch=0, soft_matched_part=0x0) at 
../../gcc-4.0.2/gcc/gcc.c:5087
#4  0x0805127e in do_spec_1 (spec=0x8e995f8 "%(invoke_as)", inswitch=0, 
soft_matched_part=0x0) at ../../gcc-4.0.2/gcc/gcc.c:5186
#5  0x080528d6 in handle_braces (p=0x8e993e4 "%(invoke_as)}") at 
../../gcc-4.0.2/gcc/gcc.c:5706
#6  0x08050b63 in do_spec_1 (spec=0x8e99290 "\t  
%{save-temps|traditional-cpp|no-integrated-cpp:%(trad_capable_cpp) 
\t\t%(cpp_options) -o %{save-temps:%b.i} %{!save-temps:%g.i} \n\t\t    cc1 
-fpreprocessed %{save-temps:%b.i} %{!save-temps:%g.i} \t\t\t%(c"..., 
inswitch=0, soft_matched_part=0x0) at ../../gcc-4.0.2/gcc/gcc.c:5087
#7  0x080528d6 in handle_braces (p=0x8e99002 "\t  
%{save-temps|traditional-cpp|no-integrated-cpp:%(trad_capable_cpp) 
\t\t%(cpp_options) -o %{save-temps:%b.i} %{!save-temps:%g.i} \n\t\t    cc1 
-fpreprocessed %{save-temps:%b.i} %{!save-temps:%g.i} \t\t\t%(c"...) at 
../../gcc-4.0.2/gcc/gcc.c:5706
#8  0x08050b63 in do_spec_1 (spec=0x8e98f98 "          
%{traditional|ftraditional:%eGNU C no longer supports -traditional without 
-E}       %{!combine:\t  
%{save-temps|traditional-cpp|no-integrated-cpp:%(trad_capable_cpp) 
\t\t%(cpp_options) -o %{sa"..., inswitch=0, soft_matched_part=0x0) at 
../../gcc-4.0.2/gcc/gcc.c:5087
#9  0x080528d6 in handle_braces (p=0x8e98c9e "          
%{traditional|ftraditional:%eGNU C no longer supports -traditional without 
-E}       %{!combine:\t  
%{save-temps|traditional-cpp|no-integrated-cpp:%(trad_capable_cpp) 
\t\t%(cpp_options) -o %{sa"...) at ../../gcc-4.0.2/gcc/gcc.c:5706
#10 0x08050b63 in do_spec_1 (spec=0x8e98c98 "%{!MM:          
%{traditional|ftraditional:%eGNU C no longer supports -traditional without 
-E}       %{!combine:\t  
%{save-temps|traditional-cpp|no-integrated-cpp:%(trad_capable_cpp) 
\t\t%(cpp_options) -"..., inswitch=0, soft_matched_part=0x0) at 
../../gcc-4.0.2/gcc/gcc.c:5087
#11 0x080528d6 in handle_braces (p=0x8e98995 "%{!MM:          
%{traditional|ftraditional:%eGNU C no longer supports -traditional without 
-E}       %{!combine:\t  
%{save-temps|traditional-cpp|no-integrated-cpp:%(trad_capable_cpp) 
\t\t%(cpp_options) -"...) at ../../gcc-4.0.2/gcc/gcc.c:5706
#12 0x08050b63 in do_spec_1 (spec=0x8e98990 "%{!M:%{!MM:          
%{traditional|ftraditional:%eGNU C no longer supports -traditional without 
-E}       %{!combine:\t  
%{save-temps|traditional-cpp|no-integrated-cpp:%(trad_capable_cpp) 
\t\t%(cpp_optio"..., inswitch=0, soft_matched_part=0x0) at 
../../gcc-4.0.2/gcc/gcc.c:5087
#13 0x080528d6 in handle_braces (p=0x8057464 "%{!M:%{!MM:          
%{traditional|ftraditional:%eGNU C no longer supports -traditional without 
-E}       %{!combine:\t  
%{save-temps|traditional-cpp|no-integrated-cpp:%(trad_capable_cpp) 
\t\t%(cpp_optio"...) at ../../gcc-4.0.2/gcc/gcc.c:5706
#14 0x08050b63 in do_spec_1 (spec=0x8057418 "%{E|M|MM:%(trad_capable_cpp) 
%(cpp_options) %(cpp_debug_options)}      %{!E:%{!M:%{!MM:          
%{traditional|ftraditional:%eGNU C no longer supports -traditional without 
-E}       %{!combine:\t  %{sa"..., inswitch=0, soft_matched_part=0x0) at 
../../gcc-4.0.2/gcc/gcc.c:5087
#15 0x08051c01 in do_spec_2 (spec=0x8057418 "%{E|M|MM:%(trad_capable_cpp) 
%(cpp_options) %(cpp_debug_options)}      %{!E:%{!M:%{!MM:          
%{traditional|ftraditional:%eGNU C no longer supports -traditional without 
-E}       %{!combine:\t  %{sa"...) at ../../gcc-4.0.2/gcc/gcc.c:4267
#16 0x08051f67 in do_spec (spec=0xd <Address 0xd out of bounds>) at 
../../gcc-4.0.2/gcc/gcc.c:4235
#17 0x080552bc in main (argc=3, argv=0xbfffd9f4) at 
../../gcc-4.0.2/gcc/gcc.c:6523
--------------------------------------------------------------------------------------------------------------

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