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tm.texi (DWARF_FRAME_REGISTERS): Add documentation.

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* doc/tm.texi (DWARF_FRAME_REGISTERS): Add documentation.
        (PRE_GCC3_DWARF_FRAME_REGISTERS): Same.

        * unwind-dw2.c (__frame_state_for): Change DWARF_FRAME_REGISTERS
        to PRE_GCC3_DWARF_FRAME_REGISTERS.
        (frame_state): Same.
        (PRE_GCC3_DWARF_FRAME_REGISTERS): Define if not already defined.

Co-Authored-By: Richard Henderson <rth@redhat.com>

From-SVN: r47730
This commit is contained in:
Aldy Hernandez 2001-12-06 21:38:03 +00:00 • committed by Aldy Hernandez
parent 9d6a24bd51
commit 919543abfe
3 changed files with 46 additions and 3 deletions
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11
gcc/ChangeLog
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@ -1,3 +1,14 @@
2001-12-06 Aldy Hernandez <aldyh@redhat.com>
Richard Henderson <rth@redhat.com>
* doc/tm.texi (DWARF_FRAME_REGISTERS): Add documentation.
(PRE_GCC3_DWARF_FRAME_REGISTERS): Same.
* unwind-dw2.c (__frame_state_for): Change DWARF_FRAME_REGISTERS
to PRE_GCC3_DWARF_FRAME_REGISTERS.
(frame_state): Same.
(PRE_GCC3_DWARF_FRAME_REGISTERS): Define if not already defined.
2001-12-06 Kaveh R. Ghazi <ghazi@caip.rutgers.edu>
* langhooks.c (lhd_staticp): Mark parameter with

27
gcc/doc/tm.texi
View file

@ -3011,6 +3011,33 @@ macros and should be used to refer to those items.
If the static chain is passed in a register, the two previous macros should
be defined instead.
@findex DWARF_FRAME_REGISTERS
@item DWARF_FRAME_REGISTERS
This macro specifies the maximum number of hard registers that can be
saved in a call frame. This is used to size data structures used in
DWARF2 exception handling.
Prior to GCC 3.0, this macro was needed in order to establish a stable
exception handling ABI in the face of adding new hard registers for ISA
extensions. In GCC 3.0 and later, the EH ABI is insulated from changes
in the number of hard registers. Nevertheless, this macro can still be
used to reduce the runtime memory requirements of the exception handling
routines, which can be substantial if the ISA contains a lot of
registers that are not call-saved.
If this macro is not defined, it defaults to
@code{FIRST_PSEUDO_REGISTER}.
@findex PRE_GCC3_DWARF_FRAME_REGISTERS
@item PRE_GCC3_DWARF_FRAME_REGISTERS
This macro is similar to @code{DWARF_FRAME_REGISTERS}, but is provided
for backward compatibility in pre GCC 3.0 compiled code.
If this macro is not defined, it defaults to
@code{DWARF_FRAME_REGISTERS}.
@end table
@node Elimination

11
gcc/unwind-dw2.c
View file

@ -42,6 +42,11 @@
#define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER
#endif
/* Dwarf frame registers used for pre gcc 3.0 compiled glibc. */
#ifndef PRE_GCC3_DWARF_FRAME_REGISTERS
#define PRE_GCC3_DWARF_FRAME_REGISTERS DWARF_FRAME_REGISTERS
#endif
/* This is the register and unwind state for a particular frame. */
struct _Unwind_Context
{
@ -944,10 +949,10 @@ typedef struct frame_state
void *eh_ptr;
long cfa_offset;
long args_size;
long reg_or_offset[DWARF_FRAME_REGISTERS+1];
long reg_or_offset[PRE_GCC3_DWARF_FRAME_REGISTERS+1];
unsigned short cfa_reg;
unsigned short retaddr_column;
char saved[DWARF_FRAME_REGISTERS+1];
char saved[PRE_GCC3_DWARF_FRAME_REGISTERS+1];
} frame_state;
struct frame_state * __frame_state_for (void *, struct frame_state *);
@ -974,7 +979,7 @@ __frame_state_for (void *pc_target, struct frame_state *state_in)
if (fs.cfa_how == CFA_EXP)
return 0;
for (reg = 0; reg < DWARF_FRAME_REGISTERS + 1; reg++)
for (reg = 0; reg < PRE_GCC3_DWARF_FRAME_REGISTERS + 1; reg++)
{
state_in->saved[reg] = fs.regs.reg[reg].how;
switch (state_in->saved[reg])