dwarf2cfi: Introduce a dw_cfi_row state.
Use it instead of old_cfa, old_args_size, and cfa_remember variables.
Remove the global cfa variable, as it was usually a duplicate of
old_cfa and otherwise confusing. Always make a local copy of the
cur_row->cfa variable before modification instead.
* dwarf2cfi.c (dw_cfi_row, dw_cfi_row_ref): New.
(cie_cfi_row): New.
(new_cfi_row, copy_cfi_row, free_cfi_row): New.
(cfa, old_cfa, cfa_remember, old_cfa_remember, old_args_size): Remove.
(cur_row, remember_row): New.
(def_cfa_1): Use cur_row instead of the old_* variables.
(dwarf2out_frame_debug_restore_state): Similarly.
(dwarf2out_args_size, dwarf2out_notice_stack_adjust): Likewise.
(dwarf2out_frame_debug_def_cfa): Use a local variable instead of cfa.
(dwarf2out_frame_debug_adjust_cfa): Likewise.
(dwarf2out_frame_debug_cfa_offset): Likewise.
(dwarf2out_frame_debug_expr): Likewise.
(execute_dwarf2_frame): Set up cur_row.
* dwarf2out.h (struct cfa_loc): Mark for GTY.
From-SVN: r176697
This commit is contained in:
Richard Henderson
Richard Henderson
parent
0be7e7a6db
commit
f17d3401b9
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@ -1,3 +1,20 @@
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2011-07-23 Richard Henderson <rth@redhat.com>
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* dwarf2cfi.c (dw_cfi_row, dw_cfi_row_ref): New.
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(cie_cfi_row): New.
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(new_cfi_row, copy_cfi_row, free_cfi_row): New.
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(cfa, old_cfa, cfa_remember, old_cfa_remember, old_args_size): Remove.
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(cur_row, remember_row): New.
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(def_cfa_1): Use cur_row instead of the old_* variables.
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(dwarf2out_frame_debug_restore_state): Similarly.
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(dwarf2out_args_size, dwarf2out_notice_stack_adjust): Likewise.
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(dwarf2out_frame_debug_def_cfa): Use a local variable instead of cfa.
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(dwarf2out_frame_debug_adjust_cfa): Likewise.
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(dwarf2out_frame_debug_cfa_offset): Likewise.
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(dwarf2out_frame_debug_expr): Likewise.
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(execute_dwarf2_frame): Set up cur_row.
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* dwarf2out.h (struct cfa_loc): Mark for GTY.
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2011-07-23 Richard Henderson <rth@redhat.com>
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* basic-block.h (EDGE_PRESERVE): New.
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208
gcc/dwarf2cfi.c
208
gcc/dwarf2cfi.c
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@ -58,9 +58,31 @@ along with GCC; see the file COPYING3. If not see
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/* Maximum size (in bytes) of an artificially generated label. */
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#define MAX_ARTIFICIAL_LABEL_BYTES 30
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/* A collected description of an entire row of the abstract CFI table. */
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typedef struct GTY(()) dw_cfi_row_struct
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{
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/* The expression that computes the CFA, expressed in two different ways.
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The CFA member for the simple cases, and the full CFI expression for
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the complex cases. The later will be a DW_CFA_cfa_expression. */
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dw_cfa_location cfa;
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dw_cfi_ref cfa_cfi;
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/* The expressions for any register column that is saved. */
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cfi_vec reg_save;
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/* The value of any DW_CFA_GNU_args_size. */
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HOST_WIDE_INT args_size;
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} dw_cfi_row;
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typedef dw_cfi_row *dw_cfi_row_ref;
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/* A vector of call frame insns for the CIE. */
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cfi_vec cie_cfi_vec;
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/* The state of the first row of the FDE table, which includes the
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state provided by the CIE. */
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static GTY(()) dw_cfi_row_ref cie_cfi_row;
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static GTY(()) unsigned long dwarf2out_cfi_label_num;
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/* The insn after which a new CFI note should be emitted. */
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@ -185,6 +207,43 @@ new_cfi (void)
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return cfi;
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}
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/* Return a newly allocated CFI row, with no defined data. */
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static dw_cfi_row_ref
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new_cfi_row (void)
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{
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dw_cfi_row_ref row = ggc_alloc_cleared_dw_cfi_row ();
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row->cfa.reg = INVALID_REGNUM;
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return row;
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}
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/* Return a copy of an existing CFI row. */
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static dw_cfi_row_ref
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copy_cfi_row (dw_cfi_row_ref src)
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{
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dw_cfi_row_ref dst = ggc_alloc_dw_cfi_row ();
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*dst = *src;
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dst->reg_save = VEC_copy (dw_cfi_ref, gc, src->reg_save);
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return dst;
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}
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/* Free an allocated CFI row. */
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static void
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free_cfi_row (dw_cfi_row_ref row)
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{
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if (row != NULL)
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{
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VEC_free (dw_cfi_ref, gc, row->reg_save);
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ggc_free (row);
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}
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}
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/* Generate a new label for the CFI info to refer to. */
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static char *
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@ -371,28 +430,25 @@ lookup_cfa_1 (dw_cfi_ref cfi, dw_cfa_location *loc, dw_cfa_location *remember)
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}
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}
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/* The current rule for calculating the DWARF2 canonical frame address. */
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static dw_cfa_location cfa;
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/* The current, i.e. most recently generated, row of the CFI table. */
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static dw_cfi_row_ref cur_row;
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/* A copy of the CFA, for comparison purposes. */
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static dw_cfa_location old_cfa;
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/* The row state from a preceeding DW_CFA_remember_state. */
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static dw_cfi_row_ref remember_row;
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/* The register used for saving registers to the stack, and its offset
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from the CFA. */
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static dw_cfa_location cfa_store;
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/* The current save location around an epilogue. */
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static dw_cfa_location cfa_remember;
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/* A temporary register holding an integral value used in adjusting SP
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or setting up the store_reg. The "offset" field holds the integer
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value, not an offset. */
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static dw_cfa_location cfa_temp;
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/* Like cfa_remember, but a copy of old_cfa. */
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static dw_cfa_location old_cfa_remember;
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/* The running total of the size of arguments pushed onto the stack. */
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/* The (really) current value for DW_CFA_GNU_args_size. We delay actually
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emitting this data, i.e. updating CUR_ROW, without async unwind. */
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static HOST_WIDE_INT args_size;
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/* The last args_size we actually output. */
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static HOST_WIDE_INT old_args_size;
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/* Determine if two dw_cfa_location structures define the same data. */
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bool
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@ -412,21 +468,18 @@ static void
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def_cfa_1 (dw_cfa_location *loc_p)
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{
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dw_cfi_ref cfi;
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dw_cfa_location loc;
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cfa = *loc_p;
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loc = *loc_p;
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dw_cfa_location loc = *loc_p;
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if (cfa_store.reg == loc.reg && loc.indirect == 0)
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cfa_store.offset = loc.offset;
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/* If nothing changed, no need to issue any call frame instructions. */
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if (cfa_equal_p (&loc, &old_cfa))
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if (cfa_equal_p (&loc, &cur_row->cfa))
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return;
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cfi = new_cfi ();
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if (loc.reg == old_cfa.reg && !loc.indirect && !old_cfa.indirect)
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if (loc.reg == cur_row->cfa.reg && !loc.indirect && !cur_row->cfa.indirect)
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{
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/* Construct a "DW_CFA_def_cfa_offset <offset>" instruction, indicating
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the CFA register did not change but the offset did. The data
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@ -440,10 +493,10 @@ def_cfa_1 (dw_cfa_location *loc_p)
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}
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#ifndef MIPS_DEBUGGING_INFO /* SGI dbx thinks this means no offset. */
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else if (loc.offset == old_cfa.offset
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&& old_cfa.reg != INVALID_REGNUM
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else if (loc.offset == cur_row->cfa.offset
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&& cur_row->cfa.reg != INVALID_REGNUM
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&& !loc.indirect
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&& !old_cfa.indirect)
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&& !cur_row->cfa.indirect)
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{
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/* Construct a "DW_CFA_def_cfa_register <register>" instruction,
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indicating the CFA register has changed to <register> but the
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@ -477,10 +530,12 @@ def_cfa_1 (dw_cfa_location *loc_p)
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cfi->dw_cfi_opc = DW_CFA_def_cfa_expression;
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loc_list = build_cfa_loc (&loc, 0);
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cfi->dw_cfi_oprnd1.dw_cfi_loc = loc_list;
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cur_row->cfa_cfi = cfi;
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}
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add_cfi (cfi);
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old_cfa = loc;
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cur_row->cfa = loc;
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}
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/* Add the CFI for saving a register. REG is the CFA column number.
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@ -503,7 +558,8 @@ reg_save (unsigned int reg, unsigned int sreg, HOST_WIDE_INT offset)
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cfi->dw_cfi_opc = DW_CFA_expression;
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cfi->dw_cfi_oprnd1.dw_cfi_reg_num = reg;
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cfi->dw_cfi_oprnd2.dw_cfi_loc
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= build_cfa_aligned_loc (&cfa, offset, fde->stack_realignment);
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= build_cfa_aligned_loc (&cur_row->cfa, offset,
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fde->stack_realignment);
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}
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else if (sreg == INVALID_REGNUM)
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{
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@ -797,10 +853,10 @@ dwarf2out_args_size (HOST_WIDE_INT size)
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{
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dw_cfi_ref cfi;
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if (size == old_args_size)
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if (size == cur_row->args_size)
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return;
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old_args_size = size;
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cur_row->args_size = size;
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cfi = new_cfi ();
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cfi->dw_cfi_opc = DW_CFA_GNU_args_size;
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@ -813,12 +869,19 @@ dwarf2out_args_size (HOST_WIDE_INT size)
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static void
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dwarf2out_stack_adjust (HOST_WIDE_INT offset)
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{
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if (cfa.reg == dw_stack_pointer_regnum)
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cfa.offset += offset;
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dw_cfa_location loc = cur_row->cfa;
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if (loc.reg == dw_stack_pointer_regnum)
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loc.offset += offset;
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if (cfa_store.reg == dw_stack_pointer_regnum)
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cfa_store.offset += offset;
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/* ??? The assumption seems to be that if A_O_A, the only CFA adjustments
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involving the stack pointer are inside the prologue and marked as
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RTX_FRAME_RELATED_P. That said, should we not verify this assumption
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by *asserting* A_O_A at this point? Why else would we have a change
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to the stack pointer? */
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if (ACCUMULATE_OUTGOING_ARGS)
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return;
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@ -830,7 +893,7 @@ dwarf2out_stack_adjust (HOST_WIDE_INT offset)
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if (args_size < 0)
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args_size = 0;
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def_cfa_1 (&cfa);
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def_cfa_1 (&loc);
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if (flag_asynchronous_unwind_tables)
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dwarf2out_args_size (args_size);
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}
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@ -862,7 +925,8 @@ dwarf2out_notice_stack_adjust (rtx insn, bool after_p)
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/* If only calls can throw, and we have a frame pointer,
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save up adjustments until we see the CALL_INSN. */
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if (!flag_asynchronous_unwind_tables && cfa.reg != dw_stack_pointer_regnum)
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if (!flag_asynchronous_unwind_tables
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&& cur_row->cfa.reg != dw_stack_pointer_regnum)
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{
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if (CALL_P (insn) && !after_p)
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{
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@ -1103,39 +1167,35 @@ reg_saved_in (rtx reg)
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return NULL_RTX;
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}
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/* A temporary register holding an integral value used in adjusting SP
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or setting up the store_reg. The "offset" field holds the integer
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value, not an offset. */
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static dw_cfa_location cfa_temp;
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/* A subroutine of dwarf2out_frame_debug, process a REG_DEF_CFA note. */
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static void
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dwarf2out_frame_debug_def_cfa (rtx pat)
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{
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memset (&cfa, 0, sizeof (cfa));
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dw_cfa_location loc;
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memset (&loc, 0, sizeof (loc));
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switch (GET_CODE (pat))
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{
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case PLUS:
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cfa.reg = dwf_regno (XEXP (pat, 0));
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cfa.offset = INTVAL (XEXP (pat, 1));
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loc.reg = dwf_regno (XEXP (pat, 0));
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loc.offset = INTVAL (XEXP (pat, 1));
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break;
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case REG:
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cfa.reg = dwf_regno (pat);
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loc.reg = dwf_regno (pat);
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break;
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case MEM:
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cfa.indirect = 1;
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loc.indirect = 1;
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pat = XEXP (pat, 0);
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if (GET_CODE (pat) == PLUS)
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{
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cfa.base_offset = INTVAL (XEXP (pat, 1));
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loc.base_offset = INTVAL (XEXP (pat, 1));
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pat = XEXP (pat, 0);
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}
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cfa.reg = dwf_regno (pat);
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loc.reg = dwf_regno (pat);
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break;
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default:
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@ -1143,7 +1203,7 @@ dwarf2out_frame_debug_def_cfa (rtx pat)
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gcc_unreachable ();
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}
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def_cfa_1 (&cfa);
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def_cfa_1 (&loc);
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}
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/* A subroutine of dwarf2out_frame_debug, process a REG_ADJUST_CFA note. */
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@ -1151,6 +1211,7 @@ dwarf2out_frame_debug_def_cfa (rtx pat)
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static void
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dwarf2out_frame_debug_adjust_cfa (rtx pat)
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{
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dw_cfa_location loc = cur_row->cfa;
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rtx src, dest;
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gcc_assert (GET_CODE (pat) == SET);
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@ -1160,8 +1221,8 @@ dwarf2out_frame_debug_adjust_cfa (rtx pat)
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switch (GET_CODE (src))
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{
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case PLUS:
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gcc_assert (dwf_regno (XEXP (src, 0)) == cfa.reg);
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cfa.offset -= INTVAL (XEXP (src, 1));
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gcc_assert (dwf_regno (XEXP (src, 0)) == loc.reg);
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loc.offset -= INTVAL (XEXP (src, 1));
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break;
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case REG:
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@ -1171,10 +1232,10 @@ dwarf2out_frame_debug_adjust_cfa (rtx pat)
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gcc_unreachable ();
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}
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cfa.reg = dwf_regno (dest);
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gcc_assert (cfa.indirect == 0);
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loc.reg = dwf_regno (dest);
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gcc_assert (loc.indirect == 0);
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def_cfa_1 (&cfa);
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def_cfa_1 (&loc);
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}
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/* A subroutine of dwarf2out_frame_debug, process a REG_CFA_OFFSET note. */
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@ -1195,12 +1256,12 @@ dwarf2out_frame_debug_cfa_offset (rtx set)
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switch (GET_CODE (addr))
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{
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case REG:
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gcc_assert (dwf_regno (addr) == cfa.reg);
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offset = -cfa.offset;
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gcc_assert (dwf_regno (addr) == cur_row->cfa.reg);
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offset = -cur_row->cfa.offset;
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break;
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case PLUS:
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gcc_assert (dwf_regno (XEXP (addr, 0)) == cfa.reg);
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offset = INTVAL (XEXP (addr, 1)) - cfa.offset;
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gcc_assert (dwf_regno (XEXP (addr, 0)) == cur_row->cfa.reg);
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offset = INTVAL (XEXP (addr, 1)) - cur_row->cfa.offset;
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break;
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default:
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gcc_unreachable ();
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@ -1366,7 +1427,9 @@ dwarf2out_frame_debug_cfa_window_save (void)
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Invariants / Summaries of Rules
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cfa current rule for calculating the CFA. It usually
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consists of a register and an offset.
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consists of a register and an offset. This is
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actually stored in cur_row->cfa, but abbreviated
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for the purposes of this documentation.
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cfa_store register used by prologue code to save things to the stack
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cfa_store.offset is the offset from the value of
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cfa_store.reg to the actual CFA
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@ -1520,6 +1583,7 @@ dwarf2out_frame_debug_cfa_window_save (void)
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static void
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dwarf2out_frame_debug_expr (rtx expr)
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{
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dw_cfa_location cfa = cur_row->cfa;
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rtx src, dest, span;
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HOST_WIDE_INT offset;
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dw_fde_ref fde;
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@ -2391,10 +2455,8 @@ dwarf2out_cfi_begin_epilogue (rtx insn)
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emit_cfa_remember = true;
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/* And emulate the state save. */
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gcc_assert (!cfa_remember.in_use);
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cfa_remember = cfa;
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old_cfa_remember = old_cfa;
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cfa_remember.in_use = 1;
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gcc_assert (remember_row == NULL);
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remember_row = copy_cfi_row (cur_row);
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}
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/* A "subroutine" of dwarf2out_cfi_begin_epilogue. Emit the restore
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@ -2408,10 +2470,10 @@ dwarf2out_frame_debug_restore_state (void)
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cfi->dw_cfi_opc = DW_CFA_restore_state;
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add_cfi (cfi);
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gcc_assert (cfa_remember.in_use);
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cfa = cfa_remember;
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old_cfa = old_cfa_remember;
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cfa_remember.in_use = 0;
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gcc_assert (remember_row != NULL);
|
||||
free_cfi_row (cur_row);
|
||||
cur_row = remember_row;
|
||||
remember_row = NULL;
|
||||
}
|
||||
|
||||
/* Record the initial position of the return address. RTL is
|
||||
|
|
@ -2472,7 +2534,7 @@ initial_return_save (rtx rtl)
|
|||
{
|
||||
if (reg != INVALID_REGNUM)
|
||||
record_reg_saved_in_reg (rtl, pc_rtx);
|
||||
reg_save (DWARF_FRAME_RETURN_COLUMN, reg, offset - cfa.offset);
|
||||
reg_save (DWARF_FRAME_RETURN_COLUMN, reg, offset - cur_row->cfa.offset);
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -2492,9 +2554,7 @@ execute_dwarf2_frame (void)
|
|||
dw_frame_pointer_regnum = DWARF_FRAME_REGNUM (HARD_FRAME_POINTER_REGNUM);
|
||||
|
||||
add_cfi_vec = &cie_cfi_vec;
|
||||
|
||||
memset (&old_cfa, 0, sizeof (old_cfa));
|
||||
old_cfa.reg = INVALID_REGNUM;
|
||||
cie_cfi_row = cur_row = new_cfi_row ();
|
||||
|
||||
/* On entry, the Canonical Frame Address is at SP. */
|
||||
memset(&loc, 0, sizeof (loc));
|
||||
|
|
@ -2537,19 +2597,16 @@ execute_dwarf2_frame (void)
|
|||
gcc_checking_assert (queued_reg_saves == NULL);
|
||||
gcc_checking_assert (regs_saved_in_regs == NULL);
|
||||
|
||||
memset (&cfa, 0, sizeof(cfa));
|
||||
cfa.reg = dw_stack_pointer_regnum;
|
||||
cfa.offset = INCOMING_FRAME_SP_OFFSET;
|
||||
cur_row = copy_cfi_row (cie_cfi_row);
|
||||
if (cie_return_save)
|
||||
VEC_safe_push (reg_saved_in_data, gc, regs_saved_in_regs, cie_return_save);
|
||||
|
||||
old_cfa = cfa;
|
||||
cfa_store = cfa;
|
||||
cfa_store = cur_row->cfa;
|
||||
args_size = 0;
|
||||
|
||||
memset (&cfa_temp, 0, sizeof(cfa_temp));
|
||||
cfa_temp.reg = INVALID_REGNUM;
|
||||
|
||||
if (cie_return_save)
|
||||
VEC_safe_push (reg_saved_in_data, gc, regs_saved_in_regs, cie_return_save);
|
||||
|
||||
dwarf2out_alloc_current_fde ();
|
||||
|
||||
/* Do the work. */
|
||||
|
|
@ -2562,6 +2619,9 @@ execute_dwarf2_frame (void)
|
|||
regs_saved_in_regs = NULL;
|
||||
queued_reg_saves = NULL;
|
||||
|
||||
free_cfi_row (cur_row);
|
||||
cur_row = NULL;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -118,7 +118,7 @@ dw_fde_node;
|
|||
It can now be either REG + CFA_OFFSET or *(REG + BASE_OFFSET) + CFA_OFFSET.
|
||||
Instead of passing around REG and OFFSET, we pass a copy
|
||||
of this structure. */
|
||||
typedef struct cfa_loc {
|
||||
typedef struct GTY(()) cfa_loc {
|
||||
HOST_WIDE_INT offset;
|
||||
HOST_WIDE_INT base_offset;
|
||||
/* REG is in DWARF_FRAME_REGNUM space, *not* normal REGNO space. */
|
||||
|
|
|
|||
Loading…
Reference in New Issue