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unwind-dw2.h (_Unwind_FrameState): Add REG_UNDEFINED enum value.

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* unwind-dw2.h (_Unwind_FrameState): Add REG_UNDEFINED enum value.
	* unwind-dw2.c (execute_cfa_program): Set how to REG_UNDEFINED
	instead of REG_UNSAVED for DW_CFA_undefined.
	(uw_update_context_1): Handle REG_UNDEFINED the same as REG_UNSAVED.
	(uw_update_context): If RA column is REG_UNDEFINED, mark it as
	outermost frame.

From-SVN: r145535
This commit is contained in:
Jakub Jelinek 2009-04-04 13:41:16 +02:00 • committed by Jakub Jelinek
parent aad2bccb9b
commit 54f5943cdb
3 changed files with 35 additions and 8 deletions
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9
gcc/ChangeLog
View file

@ -1,3 +1,12 @@
2009-04-04 Jakub Jelinek <jakub@redhat.com>
* unwind-dw2.h (_Unwind_FrameState): Add REG_UNDEFINED enum value.
* unwind-dw2.c (execute_cfa_program): Set how to REG_UNDEFINED
instead of REG_UNSAVED for DW_CFA_undefined.
(uw_update_context_1): Handle REG_UNDEFINED the same as REG_UNSAVED.
(uw_update_context): If RA column is REG_UNDEFINED, mark it as
outermost frame.
2009-04-04 Richard Earnshaw <rearnsha@arm.com>
PR target/39501

29
gcc/unwind-dw2.c
View file

@ -1,6 +1,6 @@
/* DWARF2 exception handling and frame unwind runtime interface routines.
Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
2008 Free Software Foundation, Inc.
2008, 2009 Free Software Foundation, Inc.
This file is part of GCC.
@ -943,12 +943,16 @@ execute_cfa_program (const unsigned char *insn_ptr,
fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN(reg)].how = REG_UNSAVED;
break;
case DW_CFA_undefined:
case DW_CFA_same_value:
insn_ptr = read_uleb128 (insn_ptr, &reg);
fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN(reg)].how = REG_UNSAVED;
break;
case DW_CFA_undefined:
insn_ptr = read_uleb128 (insn_ptr, &reg);
fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN(reg)].how = REG_UNDEFINED;
break;
case DW_CFA_nop:
break;
@ -1319,6 +1323,7 @@ uw_update_context_1 (struct _Unwind_Context *context, _Unwind_FrameState *fs)
switch (fs->regs.reg[i].how)
{
case REG_UNSAVED:
case REG_UNDEFINED:
break;
case REG_SAVED_OFFSET:
@ -1387,10 +1392,22 @@ uw_update_context (struct _Unwind_Context *context, _Unwind_FrameState *fs)
{
uw_update_context_1 (context, fs);
/* Compute the return address now, since the return address column
can change from frame to frame. */
context->ra = __builtin_extract_return_addr
(_Unwind_GetPtr (context, fs->retaddr_column));
/* In general this unwinder doesn't make any distinction between
undefined and same_value rule. Call-saved registers are assumed
to have same_value rule by default and explicit undefined
rule is handled like same_value. The only exception is
DW_CFA_undefined on retaddr_column which is supposed to
mark outermost frame in DWARF 3. */
if (fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN (fs->retaddr_column)].how
== REG_UNDEFINED)
/* uw_frame_state_for uses context->ra == 0 check to find outermost
stack frame. */
context->ra = 0;
else
/* Compute the return address now, since the return address column
can change from frame to frame. */
context->ra = __builtin_extract_return_addr
(_Unwind_GetPtr (context, fs->retaddr_column));
}
static void

5
gcc/unwind-dw2.h
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@ -1,5 +1,5 @@
/* DWARF2 frame unwind data structure.
Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003
Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2009
Free Software Foundation, Inc.
This file is part of GCC.
@ -55,7 +55,8 @@ typedef struct
REG_SAVED_REG,
REG_SAVED_EXP,
REG_SAVED_VAL_OFFSET,
REG_SAVED_VAL_EXP
REG_SAVED_VAL_EXP,
REG_UNDEFINED
} how;
} reg[DWARF_FRAME_REGISTERS+1];