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dwarf2out.c (struct dw_fde_struct): Reorder flags. 

* dwarf2out.c (struct dw_fde_struct): Reorder flags.
	(fde_needed_for_eh_p): New predicate.
	(output_call_frame_info): Use it throughout to decide whether FDEs
	are needed for EH purpose.
	(dwarf2out_begin_prologue): Reorder assignments.

From-SVN: r159889
This commit is contained in:
Eric Botcazou 2010-05-26 16:55:35 +00:00 committed by Eric Botcazou
parent 4204425f00
commit 4ad2e1ec08
2 changed files with 45 additions and 34 deletions
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8
gcc/ChangeLog
View File

@ -1,3 +1,11 @@
2010-05-26 Eric Botcazou <ebotcazou@adacore.com>
* dwarf2out.c (struct dw_fde_struct): Reorder flags.
(fde_needed_for_eh_p): New predicate.
(output_call_frame_info): Use it throughout to decide whether FDEs
are needed for EH purpose.
(dwarf2out_begin_prologue): Reorder assignments.
2010-05-26 Sebastian Pop <sebastian.pop@amd.com>
* tree-if-conv.c (if_convertible_gimple_assign_stmt_p): Do not

71
gcc/dwarf2out.c
View File

@ -311,9 +311,10 @@ typedef struct GTY(()) dw_fde_struct {
unsigned int drap_reg;
/* Virtual dynamic realign argument pointer register. */
unsigned int vdrap_reg;
/* These 3 flags are copied from rtl_data in function.h. */
unsigned all_throwers_are_sibcalls : 1;
unsigned nothrow : 1;
unsigned uses_eh_lsda : 1;
unsigned nothrow : 1;
/* Whether we did stack realign in this call frame. */
unsigned stack_realign : 1;
/* Whether dynamic realign argument pointer register has been saved. */
@ -3602,6 +3603,27 @@ output_fde (dw_fde_ref fde, bool for_eh, bool second,
j += 2;
}
/* Return true if frame description entry FDE is needed for EH. */
static bool
fde_needed_for_eh_p (dw_fde_ref fde)
{
if (flag_asynchronous_unwind_tables)
return true;
if (TARGET_USES_WEAK_UNWIND_INFO && DECL_WEAK (fde->decl))
return true;
if (fde->uses_eh_lsda)
return true;
/* If exceptions are enabled, we have collected nothrow info. */
if (flag_exceptions && (fde->all_throwers_are_sibcalls || fde->nothrow))
return false;
return true;
}
/* Output the call frame information used to record information
that relates to calculating the frame pointer, and records the
location of saved registers. */
@ -3631,41 +3653,25 @@ output_call_frame_info (int for_eh)
if (dwarf2out_do_cfi_asm ())
return;
/* If we make FDEs linkonce, we may have to emit an empty label for
an FDE that wouldn't otherwise be emitted. We want to avoid
having an FDE kept around when the function it refers to is
discarded. Example where this matters: a primary function
template in C++ requires EH information, but an explicit
specialization doesn't. */
if (TARGET_USES_WEAK_UNWIND_INFO
&& ! flag_asynchronous_unwind_tables
&& flag_exceptions
&& for_eh)
for (i = 0; i < fde_table_in_use; i++)
if ((fde_table[i].nothrow || fde_table[i].all_throwers_are_sibcalls)
&& !fde_table[i].uses_eh_lsda
&& ! DECL_WEAK (fde_table[i].decl))
targetm.asm_out.unwind_label (asm_out_file, fde_table[i].decl,
for_eh, /* empty */ 1);
/* If we don't have any functions we'll want to unwind out of, don't
emit any EH unwind information. Note that if exceptions aren't
enabled, we won't have collected nothrow information, and if we
asked for asynchronous tables, we always want this info. */
/* If we don't have any functions we'll want to unwind out of, don't emit
any EH unwind information. If we make FDEs linkonce, we may have to
emit an empty label for an FDE that wouldn't otherwise be emitted. We
want to avoid having an FDE kept around when the function it refers to
is discarded. Example where this matters: a primary function template
in C++ requires EH information, an explicit specialization doesn't. */
if (for_eh)
{
bool any_eh_needed = !flag_exceptions || flag_asynchronous_unwind_tables;
bool any_eh_needed = false;
for (i = 0; i < fde_table_in_use; i++)
if (fde_table[i].uses_eh_lsda)
any_eh_needed = any_lsda_needed = true;
else if (TARGET_USES_WEAK_UNWIND_INFO && DECL_WEAK (fde_table[i].decl))
any_eh_needed = true;
else if (! fde_table[i].nothrow
&& ! fde_table[i].all_throwers_are_sibcalls)
else if (fde_needed_for_eh_p (&fde_table[i]))
any_eh_needed = true;
else if (TARGET_USES_WEAK_UNWIND_INFO)
targetm.asm_out.unwind_label (asm_out_file, fde_table[i].decl, 1, 1);
if (! any_eh_needed)
if (!any_eh_needed)
return;
}
@ -3822,10 +3828,7 @@ output_call_frame_info (int for_eh)
fde = &fde_table[i];
/* Don't emit EH unwind info for leaf functions that don't need it. */
if (for_eh && !flag_asynchronous_unwind_tables && flag_exceptions
&& (fde->nothrow || fde->all_throwers_are_sibcalls)
&& ! (TARGET_USES_WEAK_UNWIND_INFO && DECL_WEAK (fde_table[i].decl))
&& !fde->uses_eh_lsda)
if (for_eh && !fde_needed_for_eh_p (fde))
continue;
for (k = 0; k < (fde->dw_fde_switched_sections ? 2 : 1); k++)
@ -3961,9 +3964,9 @@ dwarf2out_begin_prologue (unsigned int line ATTRIBUTE_UNUSED,
fde->dw_fde_cfi = NULL;
fde->dw_fde_switch_cfi = NULL;
fde->funcdef_number = current_function_funcdef_no;
fde->nothrow = crtl->nothrow;
fde->uses_eh_lsda = crtl->uses_eh_lsda;
fde->all_throwers_are_sibcalls = crtl->all_throwers_are_sibcalls;
fde->uses_eh_lsda = crtl->uses_eh_lsda;
fde->nothrow = crtl->nothrow;
fde->drap_reg = INVALID_REGNUM;
fde->vdrap_reg = INVALID_REGNUM;
if (flag_reorder_blocks_and_partition)