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| author | Jakub Jelinek <jakub@redhat.com> | 2009-04-04 13:41:16 +0200 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2009-04-04 13:41:16 +0200 |
| commit | 54f5943cdbf9c86991e68830a11ccda49850d6dc (patch) | |
| tree | 1ec79fced82ed21a4a99ea0de1bfbb49408cc202 /gcc/unwind-dw2.c | |
| parent | aad2bccb9b17ca771009135da32d71ee9e1a83d1 (diff) | |
| download | gcc-54f5943cdbf9c86991e68830a11ccda49850d6dc.zip gcc-54f5943cdbf9c86991e68830a11ccda49850d6dc.tar.gz gcc-54f5943cdbf9c86991e68830a11ccda49850d6dc.tar.bz2 | |
unwind-dw2.h (_Unwind_FrameState): Add REG_UNDEFINED enum value.
* 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
Diffstat (limited to 'gcc/unwind-dw2.c')
| -rw-r--r-- | gcc/unwind-dw2.c | 29 |
1 files changed, 23 insertions, 6 deletions
diff --git a/gcc/unwind-dw2.c b/gcc/unwind-dw2.c index 3845467..6df1ffa 100644 --- a/gcc/unwind-dw2.c +++ b/gcc/unwind-dw2.c @@ -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, ®); fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN(reg)].how = REG_UNSAVED; break; + case DW_CFA_undefined: + insn_ptr = read_uleb128 (insn_ptr, ®); + 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 |