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Add support for target helper functions which don't return 

Most functions which handle exceptions don't return.

With a compiler attribute (added by QEMU_NORETURN),
gcc can optimize the code.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Stefan Weil 2012-03-18 23:16:02 +01:00 committed by Blue Swirl
parent 4daa187d49
commit 1367ff497a
1 changed files with 7 additions and 0 deletions
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7
def-helper.h
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@ -39,6 +39,7 @@
#endif
#define dh_alias_ptr ptr
#define dh_alias_void void
#define dh_alias_noreturn noreturn
#define dh_alias_env ptr
#define dh_alias(t) glue(dh_alias_, t)
@ -52,36 +53,42 @@
#define dh_ctype_tl target_ulong
#define dh_ctype_ptr void *
#define dh_ctype_void void
#define dh_ctype_noreturn void QEMU_NORETURN
#define dh_ctype_env CPUArchState *
#define dh_ctype(t) dh_ctype_##t
/* We can't use glue() here because it falls foul of C preprocessor
recursive expansion rules. */
#define dh_retvar_decl0_void void
#define dh_retvar_decl0_noreturn void
#define dh_retvar_decl0_i32 TCGv_i32 retval
#define dh_retvar_decl0_i64 TCGv_i64 retval
#define dh_retvar_decl0_ptr TCGv_ptr retval
#define dh_retvar_decl0(t) glue(dh_retvar_decl0_, dh_alias(t))
#define dh_retvar_decl_void
#define dh_retvar_decl_noreturn
#define dh_retvar_decl_i32 TCGv_i32 retval,
#define dh_retvar_decl_i64 TCGv_i64 retval,
#define dh_retvar_decl_ptr TCGv_ptr retval,
#define dh_retvar_decl(t) glue(dh_retvar_decl_, dh_alias(t))
#define dh_retvar_void TCG_CALL_DUMMY_ARG
#define dh_retvar_noreturn TCG_CALL_DUMMY_ARG
#define dh_retvar_i32 GET_TCGV_i32(retval)
#define dh_retvar_i64 GET_TCGV_i64(retval)
#define dh_retvar_ptr GET_TCGV_ptr(retval)
#define dh_retvar(t) glue(dh_retvar_, dh_alias(t))
#define dh_is_64bit_void 0
#define dh_is_64bit_noreturn 0
#define dh_is_64bit_i32 0
#define dh_is_64bit_i64 1
#define dh_is_64bit_ptr (TCG_TARGET_REG_BITS == 64)
#define dh_is_64bit(t) glue(dh_is_64bit_, dh_alias(t))
#define dh_is_signed_void 0
#define dh_is_signed_noreturn 0
#define dh_is_signed_i32 0
#define dh_is_signed_s32 1
#define dh_is_signed_i64 0