* cfgcleanup.c (outgoing_edges_match, try_crossjump_to_edge):

[pf3gnuchains/gcc-fork.git] / gcc / doc / tm.texi

diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi
index 409559e..788bc42 100644 (file)
--- a/gcc/doc/tm.texi
+++ b/gcc/doc/tm.texi
@@ -3005,6 +3005,22 @@ someone decided it was a good idea to use that register number to
 terminate the stack backtrace.  New ports should avoid this.
 @end defmac
 
+@deftypefn {Target Hook} void TARGET_DWARF_HANDLE_FRAME_UNSPEC (const char *@var{label}, rtx @var{pattern}, int @var{index})
+This target hook allows the backend to emit frame-related insns that
+contain UNSPECs or UNSPEC_VOLATILEs.  The DWARF 2 call frame debugging
+info engine will invoke it on insns of the form
+@smallexample
+(set (reg) (unspec [...] UNSPEC_INDEX))
+@end smallexample
+and
+@smallexample
+(set (reg) (unspec_volatile [...] UNSPECV_INDEX)).
+@end smallexample
+to let the backend emit the call frame instructions.  @var{label} is
+the CFI label attached to the insn, @var{pattern} is the pattern of
+the insn and @var{index} is @code{UNSPEC_INDEX} or @code{UNSPECV_INDEX}.
+@end deftypefn
+
 @defmac INCOMING_FRAME_SP_OFFSET
 A C expression whose value is an integer giving the offset, in bytes,
 from the value of the stack pointer register to the top of the stack
@@ -4263,16 +4279,6 @@ arguments that a function should pop.  @xref{Scalar Return}.
 @c tell?  --mew 5feb93
 @end deftypefn
 
-@deftypefn {Target Hook} bool TARGET_LATE_RTL_PROLOGUE_EPILOGUE
-If set to @code{true}, it instructs the compiler to emit the RTL prologue
-and epilogue later in the game than usual, namely after all passes that
-modify the instructions (and not merely reorder them) have been run.  In
-particular, the C variable @code{current_function_uses_only_leaf_regs} is
-valid at that point.  This can be used on machines that have "register
-windows" to optimize away the regular "push" on the register stack.
-@xref{Leaf Functions}.
-@end deftypefn
-
 @itemize @bullet
 @item
 @findex current_function_pretend_args_size
@@ -7598,6 +7604,13 @@ Do not define this macro unless @code{TARGET_ASM_NAMED_SECTION} is
 also defined.
 @end defmac
 
+@defmac EH_TABLES_CAN_BE_READ_ONLY
+Define this macro to 1 if your target is such that no frame unwind
+information encoding used with non-PIC code will ever require a
+runtime relocation, but the linker may not support merging read-only
+and read-write sections into a single read-write section.
+@end defmac
+
 @defmac MASK_RETURN_ADDR
 An rtx used to mask the return address found via @code{RETURN_ADDR_RTX}, so
 that it does not contain any extraneous set bits in it.
@@ -8704,12 +8717,6 @@ contain relative addresses only when @option{-fPIC} or @option{-fPIC}
 is in effect.
 @end defmac
 
-@defmac CASE_DROPS_THROUGH
-Define this if control falls through a @code{case} insn when the index
-value is out of range.  This means the specified default-label is
-actually ignored by the @code{case} insn proper.
-@end defmac
-
 @defmac CASE_VALUES_THRESHOLD
 Define this to be the smallest number of different values for which it
 is best to use a jump-table instead of a tree of conditional branches.