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var-tracking.c (compute_cfa_pointer): Adjust head comment.

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* var-tracking.c (compute_cfa_pointer): Adjust head comment.
	(vt_initialize): Set PROLOGUE_BB unconditionally.
	Add block comment about CFA_BASE_RTX machinery.
	Reset FP_CFA_OFFSET to -1 on all invalid paths.
	Call vt_init_cfa_base only if FP_CFA_OFFSET isn't equal to -1.

From-SVN: r174146
This commit is contained in:
Eric Botcazou 2011-05-24 21:52:12 +00:00 • committed by Eric Botcazou
parent dd761d3aaf
commit 6577308791
2 changed files with 25 additions and 4 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2011-05-24 Eric Botcazou <ebotcazou@adacore.com>
* var-tracking.c (compute_cfa_pointer): Adjust head comment.
(vt_initialize): Set PROLOGUE_BB unconditionally.
Add block comment about CFA_BASE_RTX machinery.
Reset FP_CFA_OFFSET to -1 on all invalid paths.
Call vt_init_cfa_base only if FP_CFA_OFFSET isn't equal to -1.
2011-05-24 Nicola Pero <nicola.pero@meta-innovation.com>
PR objc/48187

21
gcc/var-tracking.c
View file

@ -705,7 +705,8 @@ vt_stack_adjustments (void)
static rtx cfa_base_rtx;
static HOST_WIDE_INT cfa_base_offset;
/* Compute a CFA-based value for the stack pointer. */
/* Compute a CFA-based value for an ADJUSTMENT made to stack_pointer_rtx
or hard_frame_pointer_rtx. */
static inline rtx
compute_cfa_pointer (HOST_WIDE_INT adjustment)
@ -8664,7 +8665,7 @@ vt_init_cfa_base (void)
static bool
vt_initialize (void)
{
basic_block bb, prologue_bb = NULL;
basic_block bb, prologue_bb = single_succ (ENTRY_BLOCK_PTR);
HOST_WIDE_INT fp_cfa_offset = -1;
alloc_aux_for_blocks (sizeof (struct variable_tracking_info_def));
@ -8722,6 +8723,16 @@ vt_initialize (void)
CLEAR_HARD_REG_SET (argument_reg_set);
/* In order to factor out the adjustments made to the stack pointer or to
the hard frame pointer and thus be able to use DW_OP_fbreg operations
instead of individual location lists, we're going to rewrite MEMs based
on them into MEMs based on the CFA by de-eliminating stack_pointer_rtx
or hard_frame_pointer_rtx to the virtual CFA pointer frame_pointer_rtx
resp. arg_pointer_rtx. We can do this either when there is no frame
pointer in the function and stack adjustments are consistent for all
basic blocks or when there is a frame pointer and no stack realignment.
But we first have to check that frame_pointer_rtx resp. arg_pointer_rtx
has been eliminated. */
if (!frame_pointer_needed)
{
rtx reg, elim;
@ -8764,10 +8775,11 @@ vt_initialize (void)
}
if (elim != hard_frame_pointer_rtx)
fp_cfa_offset = -1;
else
prologue_bb = single_succ (ENTRY_BLOCK_PTR);
}
else
fp_cfa_offset = -1;
}
if (frame_pointer_needed)
{
rtx insn;
@ -8868,6 +8880,7 @@ vt_initialize (void)
}
if (bb == prologue_bb
&& fp_cfa_offset != -1
&& hard_frame_pointer_adjustment == -1
&& RTX_FRAME_RELATED_P (insn)
&& fp_setter (insn))