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dwarf2out.c (dw_fde_struct): Add 'nothrow'.

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* dwarf2out.c (dw_fde_struct): Add 'nothrow'.
        (dwarf2out_begin_prologue): Set it.
        (output_call_frame_info): Don't emit EH unwind info for leaves.

From-SVN: r32434
This commit is contained in:
Jason Merrill 2000-03-08 23:05:30 +00:00 • committed by Jason Merrill
parent 602b1b13d7
commit 737faf1404
2 changed files with 23 additions and 0 deletions
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4
gcc/ChangeLog
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@ -1,5 +1,9 @@
2000-03-08 Jason Merrill <jason@casey.cygnus.com>
* dwarf2out.c (dw_fde_struct): Add 'nothrow'.
(dwarf2out_begin_prologue): Set it.
(output_call_frame_info): Don't emit EH unwind info for leaves.
* flow.c (count_basic_blocks, find_basic_blocks_1): A rethrow
can occur outside of an EH region.
* except.c: Correct comments about rethrow behavior.

19
gcc/dwarf2out.c
View file

@ -129,6 +129,7 @@ typedef struct dw_fde_struct
char *dw_fde_current_label;
char *dw_fde_end;
dw_cfi_ref dw_fde_cfi;
int nothrow;
}
dw_fde_node;
@ -1624,6 +1625,17 @@ output_call_frame_info (for_eh)
/* Do we want to include a pointer to the exception table? */
int eh_ptr = for_eh && exception_table_p ();
/* If we don't have any functions we'll want to unwind out of, don't
emit any EH unwind information. */
if (for_eh)
{
for (i = 0; i < fde_table_in_use; ++i)
if (! fde_table[i].nothrow)
goto found;
return;
found:;
}
fputc ('\n', asm_out_file);
/* We're going to be generating comments, so turn on app. */
@ -1756,6 +1768,10 @@ output_call_frame_info (for_eh)
{
fde = &fde_table[i];
/* Don't emit EH unwind info for leaf functions. */
if (for_eh && fde->nothrow)
continue;
ASM_GENERATE_INTERNAL_LABEL (l1, FDE_AFTER_SIZE_LABEL, for_eh + i*2);
ASM_GENERATE_INTERNAL_LABEL (l2, FDE_END_LABEL, for_eh + i*2);
#ifdef ASM_OUTPUT_DEFINE_LABEL_DIFFERENCE_SYMBOL
@ -1874,6 +1890,9 @@ dwarf2out_begin_prologue ()
fde->dw_fde_end = NULL;
fde->dw_fde_cfi = NULL;
/* Normally, only calls can throw, so a leaf function will never throw. */
fde->nothrow = (current_function_is_leaf && !asynchronous_exceptions);
args_size = old_args_size = 0;
}