Gentlemen.
I need some kind of assistance. I am trying to substitute function name during
the compilation procedure.
In order to do that I am:
1. creating new identifier with my name, like this:
t = get_identifier("Myfuction__ml_stub");
2. setting this name:
DECL_NAME(funcition) = t;
function is the parameter of build_function_call (tree function, tree params)
3. changing assembler name:
SET_DECL_ASSEMBLER_NAME(funcition, t);
What I have:
My sample app:
#include <stdio.h>
extern int Myfunction();
/*
int Myfunction()
{
printf("asd");
}
*/
int main()
{
Myfunction();
return 0;
}
in case the body of Myfunction is commented out, everything looks fine:
the dump:
@1 function_decl name: @2 mngl: @3 type: @4
srcp: test.c:3 undefined
extern
@2 string_cst strg: myfunction__ml_stub lngt: 20
@3 identifier_node strg: myfunction__ml_stub lngt: 19
@4 function_type size: @5 algn: 8 retn: @6
@5 integer_cst type: @7 low : 8
@6 integer_type name: @8 size: @9 algn: 32
prec: 32 min : @10 max : @11
@7 integer_type name: @12 unql: @13 size: @14
algn: 64 prec: 36 unsigned
min : @15 max : @16
@8 type_decl name: @17 type: @6 srcp: <built-in>:0
@9 integer_cst type: @7 low : 32
@10 integer_cst type: @6 high: -1 low : -2147483648
@11 integer_cst type: @6 low : 2147483647
@12 identifier_node strg: bit_size_type lngt: 13
@13 integer_type name: @12 size: @14 algn: 64
prec: 36
@14 integer_cst type: @7 low : 64
@15 integer_cst type: @7 low : 0
@16 integer_cst type: @7 high: 15 low : -1
@17 identifier_node strg: int lngt: 3
asm:
.file "test.c"
.text
.globl main
.type main, @function
main:
pushl %ebp
movl %esp, %ebp
subl $8, %esp
andl $-16, %esp
movl $0, %eax
addl $15, %eax
addl $15, %eax
shrl $4, %eax
sall $4, %eax
subl %eax, %esp
call Myfunction__ml_stub
movl $0, %eax
leave
ret
.size main, .-main
.ident "GCC: (GNU) 4.0.2"
.section .note.GNU-stack,"",@progbits
so it works.
yet when the function body is not commented:
#include <stdio.h>
extern int Myfunction();
int Myfunction()
{
printf("asd");
}
int main()
{
Myfunction();
return 0;
}
I have:
@1 function_decl name: @2 type: @3 srcp: stdio.h:0
undefined extern
@2 identifier_node strg: printf__ml_stub lngt: 15
@3 function_type size: @4 algn: 8 retn: @5
prms: @6
@4 integer_cst type: @7 low : 8
@5 integer_type name: @8 size: @9 algn: 32
prec: 32 min : @10 max : @11
@6 tree_list valu: @12
@7 integer_type name: @13 unql: @14 size: @15
algn: 64 prec: 36 unsigned
min : @16 max : @17
@8 type_decl name: @18 type: @5 srcp: <built-in>:0
@9 integer_cst type: @7 low : 32
@10 integer_cst type: @5 high: -1 low : -2147483648
@11 integer_cst type: @5 low : 2147483647
@12 pointer_type qual: r unql: @19 size: @9
algn: 32 ptd : @20
@13 identifier_node strg: bit_size_type lngt: 13
@14 integer_type name: @13 size: @15 algn: 64
prec: 36
@15 integer_cst type: @7 low : 64
@16 integer_cst type: @7 low : 0
@17 integer_cst type: @7 high: 15 low : -1
@18 identifier_node strg: int lngt: 3
@19 pointer_type size: @9 algn: 32 ptd : @20
@20 integer_type qual: c name: @21 unql: @22
size: @4 algn: 8 prec: 8
min : @23 max : @24
@21 type_decl name: @25 type: @22 srcp: <built-in>:0
@22 integer_type name: @21 size: @4 algn: 8
prec: 8 min : @23 max : @24
@23 integer_cst type: @22 high: -1 low : -128
@24 integer_cst type: @22 low : 127
@25 identifier_node strg: char lngt: 4
@1 function_decl name: @2 type: @3 srcp: test.c:0
undefined extern
@2 identifier_node strg: Myfunction__ml_stub lngt: 19
@3 function_type unql: @4 size: @5 algn: 8
retn: @6
@4 function_type size: @5 algn: 8 retn: @6
@5 integer_cst type: @7 low : 8
@6 integer_type name: @8 size: @9 algn: 32
prec: 32 min : @10 max : @11
@7 integer_type name: @12 unql: @13 size: @14
algn: 64 prec: 36 unsigned
min : @15 max : @16
@8 type_decl name: @17 type: @6 srcp: <built-in>:0
@9 integer_cst type: @7 low : 32
@10 integer_cst type: @6 high: -1 low : -2147483648
@11 integer_cst type: @6 low : 2147483647
@12 identifier_node strg: bit_size_type lngt: 13
@13 integer_type name: @12 size: @14 algn: 64
prec: 36
@14 integer_cst type: @7 low : 64
@15 integer_cst type: @7 low : 0
@16 integer_cst type: @7 high: 15 low : -1
@17 identifier_node strg: int lngt: 3
and asm:
.file "test.c"
.section .rodata
.LC0:
.string "asd"
.text
.globl Myfunction
.type Myfunction, @function
Myfunction:
pushl %ebp
movl %esp, %ebp
subl $8, %esp
movl $.LC0, (%esp)
call printf__ml_stub
leave
ret
.size Myfunction, .-Myfunction
.globl main
.type main, @function
main:
pushl %ebp
movl %esp, %ebp
subl $8, %esp
andl $-16, %esp
movl $0, %eax
addl $15, %eax
addl $15, %eax
shrl $4, %eax
sall $4, %eax
subl %eax, %esp
call Myfunction
movl $0, %eax
leave
ret
.size main, .-main
.ident "GCC: (GNU) 4.0.2"
.section .note.GNU-stack,"",@progbits
so, the I still have Myfunction call instead of Myfunction__ml_stub,
which is quite annoying :-)
Who knows the ropes?
Thank you.
