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libgcc2.c (__throw): New routine.

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* libgcc2.c (__throw): New routine.
        (__eh_pc): New data object for exception handling.

        * except.c (eh_saved_pc): New object so we can call
        assemble_external.
        (expand_internal_throw_indirect): Call assemble_external for
        __eh_pc.
        (end_eh_unwinder): Ditto.
        (init_eh): Initialize eh_saved_pc.
fixes eh6.C on rs6000 and alpha

From-SVN: r12646
This commit is contained in:
Mike Stump 1996-08-16 00:52:06 +00:00
parent 6a5d752611
commit 843e83356c
2 changed files with 27 additions and 3 deletions
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15
gcc/except.c
View File

@ -165,9 +165,10 @@ struct label_node *caught_return_label_stack = NULL;
struct label_node *false_label_stack = NULL;
/* The rtx for the saved PC value. */
/* The rtx and the tree for the saved PC value. */
rtx eh_saved_pc_rtx;
tree eh_saved_pc;
rtx expand_builtin_return_addr PROTO((enum built_in_function, int, rtx));
@ -450,6 +451,7 @@ void
expand_internal_throw_indirect (context)
rtx context;
{
assemble_external (eh_saved_pc);
emit_move_insn (eh_saved_pc_rtx, context);
emit_throw ();
}
@ -759,6 +761,8 @@ end_eh_unwinder ()
return;
#endif
assemble_external (eh_saved_pc);
expr = make_node (RTL_EXPR);
TREE_TYPE (expr) = void_type_node;
RTL_EXPR_RTL (expr) = const0_rtx;
@ -955,8 +959,13 @@ check_exception_handler_labels ()
void
init_eh ()
{
eh_saved_pc_rtx = gen_rtx (MEM, ptr_mode,
gen_rtx (SYMBOL_REF, Pmode, "__eh_pc"));
tree type = build_pointer_type (make_node (VOID_TYPE));
eh_saved_pc = build_decl (VAR_DECL, get_identifier ("__eh_pc"), type);
DECL_EXTERNAL (eh_saved_pc) = 1;
TREE_PUBLIC (eh_saved_pc) = 1;
make_decl_rtl (eh_saved_pc, NULL_PTR, 1);
eh_saved_pc_rtx = DECL_RTL (eh_saved_pc);
}
/* Initialize various EH things. */

15
gcc/libgcc2.c
View File

@ -3149,6 +3149,21 @@ __throw_type_match (void *catch_type, void *throw_type, void *obj)
return 0;
}
/* Throw stub routine.
This is work in progress, but not completed yet. */
void
__throw ()
{
abort ();
}
/* This value identifies the place from which an exception is being
thrown. */
void *__eh_pc;
void
__empty ()
{