C:\test>type expand_malloc.c
#include "EXTERN.h"
#include "perl.h"

char *p = malloc( 10 );

C:\test> cl -E -nologo -GF -W3 -MD -Zi -DNDEBUG -Ox -GL -Wp64 -fp:precise -DWIN32 -D_CONSOLE -DNO_STRICT -DHAVE_DES_FCRYPT -DWIN64 -DCONSERVATIVE -DUSE_SITECUSTOMIZE -DPRIVLIB_LAST_IN_INC -DPERL_IMPLICIT_CONTEXT -DPERL_IMPLICIT_SYS -DUSE_PERLIO -DPERL_MSVCRT_READFIX -MD -Zi -DNDEBUG -Ox -GL -Wp64 -fp:precise    -DVERSION=\"1.76\"  -DXS_VERSION=\"1.76\"  "-IC:\Perl64\lib\CORE"  -DHAS_PPPORT_H expand_malloc.c >junk.txt

##</code><code>##

[203524 lines omitted :)]
#line 3 "expand_malloc.c"

char *p = malloc( 10 );

##</code><code>##

...
#line 4 "expand_malloc.c"

char *p = (*(*Perl_IMem_ptr(((PerlInterpreter *)Perl_get_context())))->pMalloc)((*Perl_IMem_ptr(((PerlInterpreter *)Perl_get_context()))), (10));