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Fix incomplete commit.

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From-SVN: r88986
This commit is contained in:
Eric Botcazou 2004-10-13 14:09:05 +00:00
parent b9bf58e5fa
commit 65e71cd635
1 changed files with 16 additions and 15 deletions
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31
gcc/doc/tm.texi
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@ -4374,7 +4374,7 @@ You need not define this macro if you did not define
@code{DELAY_SLOTS_FOR_EPILOGUE}.
@end defmac
@deftypefn {Target Hook} void TARGET_ASM_OUTPUT_MI_THUNK (FILE *@var{file}, tree @var{thunk_fndecl}, HOST_WIDE_INT @var{delta}, tree @var{function})
@deftypefn {Target Hook} void TARGET_ASM_OUTPUT_MI_THUNK (FILE *@var{file}, tree @var{thunk_fndecl}, HOST_WIDE_INT @var{delta}, HOST_WIDE_INT @var{vcall_offset}, tree @var{function})
A function that outputs the assembler code for a thunk
function, used to implement C++ virtual function calls with multiple
inheritance. The thunk acts as a wrapper around a virtual function,
@ -4388,7 +4388,15 @@ in C++. This is the incoming argument @emph{before} the function prologue,
e.g.@: @samp{%o0} on a sparc. The addition must preserve the values of
all other incoming arguments.
After the addition, emit code to jump to @var{function}, which is a
Then, if @var{vcall_offset} is nonzero, an additional adjustment should be
made after adding @code{delta}. In particular, if @var{p} is the
adjusted pointer, the following adjustment should be made:
@smallexample
p += (*((ptrdiff_t **)p))[vcall_offset/sizeof(ptrdiff_t)]
@end smallexample
After the additions, emit code to jump to @var{function}, which is a
@code{FUNCTION_DECL}. This is a direct pure jump, not a call, and does
not touch the return address. Hence returning from @var{FUNCTION} will
return to whoever called the current @samp{thunk}.
@ -4408,19 +4416,12 @@ front end will generate a less efficient heavyweight thunk that calls
not support varargs.
@end deftypefn
@deftypefn {Target Hook} void TARGET_ASM_OUTPUT_MI_VCALL_THUNK (FILE *@var{file}, tree @var{thunk_fndecl}, HOST_WIDE_INT @var{delta}, int @var{vcall_offset}, tree @var{function})
A function like @code{TARGET_ASM_OUTPUT_MI_THUNK}, except that if
@var{vcall_offset} is nonzero, an additional adjustment should be made
after adding @code{delta}. In particular, if @var{p} is the
adjusted pointer, the following adjustment should be made:
@smallexample
p += (*((ptrdiff_t **)p))[vcall_offset/sizeof(ptrdiff_t)]
@end smallexample
@noindent
If this function is defined, it will always be used in place of
@code{TARGET_ASM_OUTPUT_MI_THUNK}.
@deftypefn {Target Hook} bool TARGET_ASM_CAN_OUTPUT_MI_THUNK (tree @var{thunk_fndecl}, HOST_WIDE_INT @var{delta}, HOST_WIDE_INT @var{vcall_offset}, tree @var{function})
A function that returns true if TARGET_ASM_OUTPUT_MI_THUNK would be able
to output the assembler code for the thunk function specified by the
arguments it is passed, and false otherwise. In the latter case, the
generic approach will be used by the C++ front end, with the limitations
previously exposed.
@end deftypefn
@node Profiling