From 3f997a978d8a747afbf345c97e1a5dcc87c17732 Mon Sep 17 00:00:00 2001 From: Corinna Vinschen Date: Fri, 10 Oct 2003 19:14:08 +0000 Subject: [PATCH] * sh-tdep.c (sh_use_struct_convention): Clean up to have a more readable code. Accomodate passing of bitfields. --- gdb/ChangeLog | 5 +++++ gdb/sh-tdep.c | 26 ++++++++++++++++++++++++-- 2 files changed, 29 insertions(+), 2 deletions(-) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 41f7dfe5dcb..d170797c1d8 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,8 @@ +2003-10-10 Corinna Vinschen + + * sh-tdep.c (sh_use_struct_convention): Clean up to have a + more readable code. Accomodate passing of bitfields. + 2003-10-10 Andrew Cagney * Makefile.in (ppc-sysv-tdep.o): Add $(gdb_assert_h). diff --git a/gdb/sh-tdep.c b/gdb/sh-tdep.c index a220493f38f..eee7698b842 100644 --- a/gdb/sh-tdep.c +++ b/gdb/sh-tdep.c @@ -589,8 +589,30 @@ sh_use_struct_convention (int gcc_p, struct type *type) { int len = TYPE_LENGTH (type); int nelem = TYPE_NFIELDS (type); - return ((len != 1 && len != 2 && len != 4 && len != 8) || nelem != 1) && - (len != 8 || TYPE_LENGTH (TYPE_FIELD_TYPE (type, 0)) != 4); + + /* Non-power of 2 length types and types bigger than 8 bytes (which don't + fit in two registers anyway) use struct convention. */ + if (len != 1 && len != 2 && len != 4 && len != 8) + return 1; + + /* Scalar types and aggregate types with exactly one field are aligned + by definition. They are returned in registers. */ + if (nelem <= 1) + return 0; + + /* If the first field in the aggregate has the same length as the entire + aggregate type, the type is returned in registers. */ + if (TYPE_LENGTH (TYPE_FIELD_TYPE (type, 0)) == len) + return 0; + + /* If the size of the aggregate is 8 bytes and the first field is + of size 4 bytes its alignment is equal to long long's alignment, + so it's returned in registers. */ + if (len == 8 && TYPE_LENGTH (TYPE_FIELD_TYPE (type, 0)) == 4) + return 0; + + /* Otherwise use struct convention. */ + return 1; } /* Extract from an array REGBUF containing the (raw) register state -- 2.30.2