r255884 - in /trunk/gcc: ChangeLog dwarf2cfi.c ...

[rsandifo@gcc.gnu.org]

Author: rsandifo
Date: Wed Dec 20 12:54:44 2017
New Revision: 255884

URL: https://gcc.gnu.org/viewcvs?rev=255884&root=gcc&view=rev
Log:
poly_int: DWARF CFA offsets

This patch makes the DWARF code use poly_int64 rather than
HOST_WIDE_INT for CFA offsets.  The main changes are:

- to make reg_save use a DW_CFA_expression representation when
  the offset isn't constant and

- to record the CFA information alongside a def_cfa_expression
  if either offset is polynomial, since it's quite difficult
  to reconstruct the CFA information otherwise.

2017-12-20  Richard Sandiford  <richard.sandiford@linaro.org>
	    Alan Hayward  <alan.hayward@arm.com>
	    David Sherwood  <david.sherwood@arm.com>

gcc/
	* gengtype.c (main): Handle poly_int64_pod.
	* dwarf2out.h (dw_cfi_oprnd_cfa_loc): New dw_cfi_oprnd_type.
	(dw_cfi_oprnd::dw_cfi_cfa_loc): New field.
	(dw_cfa_location::offset, dw_cfa_location::base_offset): Change
	from HOST_WIDE_INT to poly_int64_pod.
	* dwarf2cfi.c (queued_reg_save::cfa_offset): Likewise.
	(copy_cfa): New function.
	(lookup_cfa_1): Use the cached dw_cfi_cfa_loc, if it exists.
	(cfi_oprnd_equal_p): Handle dw_cfi_oprnd_cfa_loc.
	(cfa_equal_p, dwarf2out_frame_debug_adjust_cfa)
	(dwarf2out_frame_debug_cfa_offset, dwarf2out_frame_debug_expr)
	(initial_return_save): Treat offsets as poly_ints.
	(def_cfa_0): Likewise.  Cache the CFA in dw_cfi_cfa_loc if either
	offset is nonconstant.
	(reg_save): Take the offset as a poly_int64.  Fall back to
	DW_CFA_expression for nonconstant offsets.
	(queue_reg_save): Take the offset as a poly_int64.
	* dwarf2out.c (dw_cfi_oprnd2_desc): Handle DW_CFA_def_cfa_expression.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/dwarf2cfi.c
    trunk/gcc/dwarf2out.c
    trunk/gcc/dwarf2out.h
    trunk/gcc/gengtype.c