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builtins.c (expand_builtin): Remove.

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* builtins.c (expand_builtin) <BUILT_IN_DWARF_FP_REGNUM>: Remove.
        <BUILT_IN_DWARF_SP_COLUMN>: New.
        * builtins.def (BUILT_IN_DWARF_FP_REGNUM): Remove.
        (BUILT_IN_DWARF_SP_COLUMN): New.
        * dwarf2out.c (expand_builtin_dwarf_fp_regnum): Remove.
        (expand_builtin_dwarf_sp_column): New.
        * except.h: Update to match.
        * unwind-dw2.c (execute_stack_op): Correct stack push typo.
        (execute_cfa_program): Record location expression address
        before extracting length.
        (uw_update_context_1): Install old CFA into stack pointer column.
        (uw_init_context_1): Set cfa_reg to stack pointer column.

From-SVN: r66447
This commit is contained in:
Richard Henderson 2003-05-03 22:22:51 -07:00 committed by Richard Henderson
parent 4d588c1434
commit 9c80ff25b7
6 changed files with 49 additions and 26 deletions
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15
gcc/ChangeLog
View File

@ -1,3 +1,18 @@
2003-05-03 Richard Henderson <rth@redhat.com>
* builtins.c (expand_builtin) <BUILT_IN_DWARF_FP_REGNUM>: Remove.
<BUILT_IN_DWARF_SP_COLUMN>: New.
* builtins.def (BUILT_IN_DWARF_FP_REGNUM): Remove.
(BUILT_IN_DWARF_SP_COLUMN): New.
* dwarf2out.c (expand_builtin_dwarf_fp_regnum): Remove.
(expand_builtin_dwarf_sp_column): New.
* except.h: Update to match.
* unwind-dw2.c (execute_stack_op): Correct stack push typo.
(execute_cfa_program): Record location expression address
before extracting length.
(uw_update_context_1): Install old CFA into stack pointer column.
(uw_init_context_1): Set cfa_reg to stack pointer column.
2003-05-03 Richard Henderson <rth@redhat.com>
* config/rs6000/rs6000.c (constant_pool_expr_p): Make static and

4
gcc/builtins.c
View File

@ -4703,8 +4703,8 @@ expand_builtin (exp, target, subtarget, mode, ignore)
case BUILT_IN_DWARF_CFA:
return virtual_cfa_rtx;
#ifdef DWARF2_UNWIND_INFO
case BUILT_IN_DWARF_FP_REGNUM:
return expand_builtin_dwarf_fp_regnum ();
case BUILT_IN_DWARF_SP_COLUMN:
return expand_builtin_dwarf_sp_column ();
case BUILT_IN_INIT_DWARF_REG_SIZES:
expand_builtin_init_dwarf_reg_sizes (TREE_VALUE (arglist));
return const0_rtx;

4
gcc/builtins.def
View File

@ -881,8 +881,8 @@ DEF_GCC_BUILTIN(BUILT_IN_DWARF_CFA,
"__builtin_dwarf_cfa",
BT_FN_PTR,
ATTR_NULL)
DEF_GCC_BUILTIN(BUILT_IN_DWARF_FP_REGNUM,
"__builtin_dwarf_fp_regnum",
DEF_GCC_BUILTIN(BUILT_IN_DWARF_SP_COLUMN,
"__builtin_dwarf_sp_column",
BT_FN_UNSIGNED,
ATTR_NULL)
DEF_GCC_BUILTIN(BUILT_IN_INIT_DWARF_REG_SIZES,

4
gcc/dwarf2out.c
View File

@ -414,9 +414,9 @@ static void def_cfa_1 PARAMS ((const char *,
/* Hook used by __throw. */
rtx
expand_builtin_dwarf_fp_regnum ()
expand_builtin_dwarf_sp_column ()
{
return GEN_INT (DWARF_FRAME_REGNUM (HARD_FRAME_POINTER_REGNUM));
return GEN_INT (DWARF_FRAME_REGNUM (STACK_POINTER_REGNUM));
}
/* Return a pointer to a copy of the section string name S with all

2
gcc/except.h
View File

@ -114,7 +114,7 @@ extern rtx expand_builtin_eh_return_data_regno PARAMS ((tree));
extern rtx expand_builtin_extract_return_addr PARAMS ((tree));
extern void expand_builtin_init_dwarf_reg_sizes PARAMS ((tree));
extern rtx expand_builtin_frob_return_addr PARAMS ((tree));
extern rtx expand_builtin_dwarf_fp_regnum PARAMS ((void));
extern rtx expand_builtin_dwarf_sp_column PARAMS ((void));
extern void expand_builtin_eh_return PARAMS ((tree, tree));
extern void expand_eh_return PARAMS ((void));
extern rtx get_exception_pointer PARAMS ((struct function *));

46
gcc/unwind-dw2.c
View File

@ -726,7 +726,7 @@ execute_stack_op (const unsigned char *op_ptr, const unsigned char *op_end,
/* Most things push a result value. */
if ((size_t) stack_elt >= sizeof(stack)/sizeof(*stack))
abort ();
stack[++stack_elt] = result;
stack[stack_elt++] = result;
no_push:;
}
@ -878,17 +878,17 @@ execute_cfa_program (const unsigned char *insn_ptr,
break;
case DW_CFA_def_cfa_expression:
insn_ptr = read_uleb128 (insn_ptr, &utmp);
fs->cfa_exp = insn_ptr;
fs->cfa_how = CFA_EXP;
insn_ptr = read_uleb128 (insn_ptr, &utmp);
insn_ptr += utmp;
break;
case DW_CFA_expression:
insn_ptr = read_uleb128 (insn_ptr, &reg);
insn_ptr = read_uleb128 (insn_ptr, &utmp);
fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN (reg)].how = REG_SAVED_EXP;
fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN (reg)].loc.exp = insn_ptr;
insn_ptr = read_uleb128 (insn_ptr, &utmp);
insn_ptr += utmp;
break;
@ -1076,37 +1076,41 @@ static void
uw_update_context_1 (struct _Unwind_Context *context, _Unwind_FrameState *fs)
{
struct _Unwind_Context orig_context = *context;
_Unwind_Word tmp_sp;
void *cfa;
long i;
/* Special handling here: Many machines do not use a frame pointer,
and track the CFA only through offsets from the stack pointer from
one frame to the next. In this case, the stack pointer is never
stored, so it has no saved address in the context. What we do
have is the CFA from the previous stack frame.
In very special situations (such as unwind info for signal return),
there may be location expressions that use the stack pointer as well.
Given that other unwind mechanisms generally won't work if you try
to represent stack pointer saves and restores directly, we don't
bother conditionalizing this at all. */
tmp_sp = (_Unwind_Ptr) context->cfa;
_Unwind_SetGRPtr (&orig_context, __builtin_dwarf_sp_column (), &tmp_sp);
/* Compute this frame's CFA. */
switch (fs->cfa_how)
{
case CFA_REG_OFFSET:
/* Special handling here: Many machines do not use a frame pointer,
and track the CFA only through offsets from the stack pointer from
one frame to the next. In this case, the stack pointer is never
stored, so it has no saved address in the context. What we do
have is the CFA from the previous stack frame. */
if (_Unwind_GetGRPtr (context, fs->cfa_reg) == NULL)
cfa = context->cfa;
else
cfa = (void *) (_Unwind_Ptr) _Unwind_GetGR (context, fs->cfa_reg);
cfa = (void *) (_Unwind_Ptr) _Unwind_GetGR (&orig_context, fs->cfa_reg);
cfa += fs->cfa_offset;
break;
case CFA_EXP:
/* ??? No way of knowing what register number is the stack pointer
to do the same sort of handling as above. Assume that if the
CFA calculation is so complicated as to require a stack program
that this will not be a problem. */
{
const unsigned char *exp = fs->cfa_exp;
_Unwind_Word len;
exp = read_uleb128 (exp, &len);
cfa = (void *) (_Unwind_Ptr)
execute_stack_op (exp, exp + len, context, 0);
execute_stack_op (exp, exp + len, &orig_context, 0);
break;
}
@ -1121,14 +1125,18 @@ uw_update_context_1 (struct _Unwind_Context *context, _Unwind_FrameState *fs)
{
case REG_UNSAVED:
break;
case REG_SAVED_OFFSET:
_Unwind_SetGRPtr (context, i, (void *) (cfa + fs->regs.reg[i].loc.offset));
_Unwind_SetGRPtr (context, i,
(void *) (cfa + fs->regs.reg[i].loc.offset));
break;
case REG_SAVED_REG:
_Unwind_SetGRPtr
(context, i,
_Unwind_GetGRPtr (&orig_context, fs->regs.reg[i].loc.reg));
break;
case REG_SAVED_EXP:
{
const unsigned char *exp = fs->regs.reg[i].loc.exp;
@ -1190,7 +1198,7 @@ uw_init_context_1 (struct _Unwind_Context *context,
/* Force the frame state to use the known cfa value. */
context->cfa = outer_cfa;
fs.cfa_how = CFA_REG_OFFSET;
fs.cfa_reg = 0;
fs.cfa_reg = __builtin_dwarf_sp_column ();
fs.cfa_offset = 0;
uw_update_context_1 (context, &fs);