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var-tracking.c: Fix some comments. 

* var-tracking.c: Fix some comments.
	(frame_stack_adjust): New.
	(vt_stack_adjustments): Init stack_adjust of entry block to
	minus stack adjustment of function prologue.
	(adjust_stack_reference): Do not adjust if adjustment == 0.
	(compute_bb_dataflow): Use plus_constant instead of gen_rtx_PLUS.
	(emit_notes_in_bb): Likewise.
	(vt_add_function_parameters): Do not adjust locations of
	function arguments.
	(vt_initialize): Compute the stack adjustment of function
	prologue and offset the initial "location" of frame_base_decl
	from the stack pointer after prologue.

From-SVN: r84106
This commit is contained in:
Josef Zlomek 2004-07-05 06:50:22 +02:00 committed by Josef Zlomek
parent 6071dc7fe9
commit feb61729c9
2 changed files with 32 additions and 18 deletions
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15
gcc/ChangeLog
View File

@ -1,3 +1,18 @@
2004-07-05 Josef Zlomek <zlomekj@suse.cz>
* var-tracking.c: Fix some comments.
(frame_stack_adjust): New.
(vt_stack_adjustments): Init stack_adjust of entry block to
minus stack adjustment of function prologue.
(adjust_stack_reference): Do not adjust if adjustment == 0.
(compute_bb_dataflow): Use plus_constant instead of gen_rtx_PLUS.
(emit_notes_in_bb): Likewise.
(vt_add_function_parameters): Do not adjust locations of
function arguments.
(vt_initialize): Compute the stack adjustment of function
prologue and offset the initial "location" of frame_base_decl
from the stack pointer after prologue.
2004-07-04 Richard Henderson <rth@redhat.com>
* function.c (struct assign_parm_data_all): New.

35
gcc/var-tracking.c
View File

@ -267,6 +267,9 @@ static bool emit_notes;
/* Fake variable for stack pointer. */
tree frame_base_decl;
/* Stack adjust caused by function prologue. */
static HOST_WIDE_INT frame_stack_adjust;
/* Local function prototypes. */
static void stack_adjust_offset_pre_post (rtx, HOST_WIDE_INT *,
HOST_WIDE_INT *);
@ -484,7 +487,7 @@ bb_stack_adjust_offset (basic_block bb)
VTI (bb)->out.stack_adjust = offset;
}
/* Compute stack adjustment caused by function prolog. */
/* Compute stack adjustment caused by function prologue. */
static HOST_WIDE_INT
prologue_stack_adjust (void)
@ -528,7 +531,7 @@ vt_stack_adjustments (void)
/* Initialize entry block. */
VTI (ENTRY_BLOCK_PTR)->visited = true;
VTI (ENTRY_BLOCK_PTR)->out.stack_adjust = 0;
VTI (ENTRY_BLOCK_PTR)->out.stack_adjust = frame_stack_adjust;
/* Allocate stack for back-tracking up CFG. */
stack = xmalloc ((n_basic_blocks + 1) * sizeof (edge));
@ -590,6 +593,9 @@ adjust_stack_reference (rtx mem, HOST_WIDE_INT adjustment)
rtx adjusted_mem;
rtx tmp;
if (adjustment == 0)
return mem;
adjusted_mem = copy_rtx (mem);
XEXP (adjusted_mem, 0) = replace_rtx (XEXP (adjusted_mem, 0),
stack_pointer_rtx,
@ -1653,9 +1659,8 @@ compute_bb_dataflow (basic_block bb)
rtx base;
out->stack_adjust += VTI (bb)->mos[i].u.adjust;
base = gen_rtx_MEM (Pmode,
gen_rtx_PLUS (Pmode, stack_pointer_rtx,
GEN_INT (out->stack_adjust)));
base = gen_rtx_MEM (Pmode, plus_constant (stack_pointer_rtx,
out->stack_adjust));
set_frame_base_location (out, base);
}
break;
@ -1918,9 +1923,8 @@ variable_was_changed (variable var, htab_t htab)
}
/* Set the location of frame_base_decl to LOC in dataflow set SET. This
function expects that
frame_base_decl has already one location for offset 0 in the variable table.
*/
function expects that frame_base_decl has already one location for offset 0
in the variable table. */
static void
set_frame_base_location (dataflow_set *set, rtx loc)
@ -2409,9 +2413,8 @@ emit_notes_in_bb (basic_block bb)
rtx base;
set.stack_adjust += VTI (bb)->mos[i].u.adjust;
base = gen_rtx_MEM (Pmode,
gen_rtx_PLUS (Pmode, stack_pointer_rtx,
GEN_INT (set.stack_adjust)));
base = gen_rtx_MEM (Pmode, plus_constant (stack_pointer_rtx,
set.stack_adjust));
set_frame_base_location (&set, base);
emit_notes_for_changes (insn, EMIT_NOTE_AFTER_INSN);
}
@ -2490,11 +2493,7 @@ static void
vt_add_function_parameters (void)
{
tree parm;
HOST_WIDE_INT stack_adjust = 0;
if (!frame_pointer_needed)
stack_adjust = prologue_stack_adjust ();
for (parm = DECL_ARGUMENTS (current_function_decl);
parm; parm = TREE_CHAIN (parm))
{
@ -2529,8 +2528,6 @@ vt_add_function_parameters (void)
#endif
incoming = eliminate_regs (incoming, 0, NULL_RTX);
if (!frame_pointer_needed && MEM_P (incoming))
incoming = adjust_stack_reference (incoming, -stack_adjust);
out = &VTI (ENTRY_BLOCK_PTR)->out;
if (REG_P (incoming))
@ -2703,7 +2700,9 @@ vt_initialize (void)
DECL_ARTIFICIAL (frame_base_decl) = 1;
/* Set its initial "location". */
base = gen_rtx_MEM (Pmode, stack_pointer_rtx);
frame_stack_adjust = -prologue_stack_adjust ();
base = gen_rtx_MEM (Pmode, plus_constant (stack_pointer_rtx,
frame_stack_adjust));
set_variable_part (&VTI (ENTRY_BLOCK_PTR)->out, base, frame_base_decl, 0);
}
else