Optional matching for run_dump_test

This adds an alternative to using #... in dump files, useful where we
only want to allow specific extra output.  DW_CFA_nop in CIEs and FDEs
to pad out to required alignment (larger for 64-bit than 32-bit) is
an example where these optional match patterns are useful.

binutils/
	* testsuite/lib/binutils-common.exp (regexp_diff): Support #?REGEXP.
ld/
	* testsuite/ld-elf/eh4.d: Match optional padding DW_CFA_nop in FDEs.
	* testsuite/ld-elf/eh5.d: Likewise, and extra CIEs emitted on
	embedded targets.

3 files changed, 63 insertions, 9 deletions

diff --git a/ld/ChangeLog b/ld/ChangeLog
index 8c07ff6..a704214 100644
--- a/ld/ChangeLog
+++ b/ld/ChangeLog
@@ -1,3 +1,9 @@
+2019-12-08  Alan Modra  <amodra@gmail.com>
+
+	* testsuite/ld-elf/eh4.d: Match optional padding DW_CFA_nop in FDEs.
+	* testsuite/ld-elf/eh5.d: Likewise, and extra CIEs emitted on
+	embedded targets.
+
 2019-12-06  Alan Modra  <amodra@gmail.com>
 
 	* testsuite/ld-mips-elf/eh-frame1-n32.d: Pass --eh-frame-hdr to ld.
diff --git a/ld/testsuite/ld-elf/eh4.d b/ld/testsuite/ld-elf/eh4.d
index 391efb8..f33431a 100644
--- a/ld/testsuite/ld-elf/eh4.d
+++ b/ld/testsuite/ld-elf/eh4.d
@@ -34,6 +34,10 @@ Contents of the .eh_frame section:
   DW_CFA_def_cfa_offset: 24
   DW_CFA_advance_loc: [0-9a-f]+ to [0-9a-f]+
   DW_CFA_def_cfa_expression \(DW_OP_breg7 \(rsp\): 8; DW_OP_breg16 \(rip\): 0;.*
-#...
+#?  DW_CFA_nop
+#?  DW_CFA_nop
+#?  DW_CFA_nop
+#?  DW_CFA_nop
+
 [0-9a-f]+ ZERO terminator
 #pass
diff --git a/ld/testsuite/ld-elf/eh5.d b/ld/testsuite/ld-elf/eh5.d
index e61db61..4a69748 100644
--- a/ld/testsuite/ld-elf/eh5.d
+++ b/ld/testsuite/ld-elf/eh5.d
@@ -19,7 +19,11 @@ Contents of the .eh_frame section:
   DW_CFA_nop
   DW_CFA_nop
   DW_CFA_nop
-#...
+#?  DW_CFA_nop
+#?  DW_CFA_nop
+#?  DW_CFA_nop
+#?  DW_CFA_nop
+
 0+001[48] 0+0014 0+001[8c] FDE cie=0+0000 pc=.*
   DW_CFA_advance_loc: 4 to .*
   DW_CFA_def_cfa: r0(.*) ofs 16
@@ -62,7 +66,11 @@ Contents of the .eh_frame section:
   DW_CFA_nop
   DW_CFA_nop
   DW_CFA_nop
-#...
+#?  DW_CFA_nop
+#?  DW_CFA_nop
+#?  DW_CFA_nop
+#?  DW_CFA_nop
+
 0+009[08] 0+001c 0+002[04] FDE cie=0+007[48] pc=.*
   Augmentation data:     (ef be ad de 00 00 00 00|00 00 00 00 de ad be ef)
 
@@ -81,12 +89,20 @@ Contents of the .eh_frame section:
   Augmentation data:     (0b|1b)
 
   DW_CFA_def_cfa: r0(.*) ofs 16
-#...
+#?  DW_CFA_nop
+#?  DW_CFA_nop
+#?  DW_CFA_nop
+#?  DW_CFA_nop
+
 0+00(c4|d0) 0+001[04] 0+001[8c] FDE cie=0+00b[08] pc=.*
   DW_CFA_nop
   DW_CFA_nop
   DW_CFA_nop
-#...
+#?  DW_CFA_nop
+#?  DW_CFA_nop
+#?  DW_CFA_nop
+#?  DW_CFA_nop
+
 0+00[de]8 0+0014 0+0000 CIE
   Version:               [13]
   Augmentation:          "zPR"
@@ -108,7 +124,11 @@ Contents of the .eh_frame section:
   DW_CFA_nop
   DW_CFA_nop
   DW_CFA_nop
-#...
+#?  DW_CFA_nop
+#?  DW_CFA_nop
+#?  DW_CFA_nop
+#?  DW_CFA_nop
+
 0+01(1c|30) 0+001[8c] 0+0000 CIE
   Version:               [13]
   Augmentation:          "zPLR"
@@ -120,7 +140,11 @@ Contents of the .eh_frame section:
   DW_CFA_nop
   DW_CFA_nop
   DW_CFA_nop
-#...
+#?  DW_CFA_nop
+#?  DW_CFA_nop
+#?  DW_CFA_nop
+#?  DW_CFA_nop
+
 0+01(38|50) 0+001c 0+002[04] FDE cie=0+01(1c|30) pc=.*
   Augmentation data:     (ef be ad de 00 00 00 00|00 00 00 00 de ad be ef)
 
@@ -136,7 +160,16 @@ Contents of the .eh_frame section:
   DW_CFA_nop
   DW_CFA_nop
   DW_CFA_nop
-#...
+
+#?0+0170 0+0014 0+ CIE
+#?  Version:               1
+#?  Augmentation:          "zPR"
+#?  Code alignment factor: .*
+#?  Data alignment factor: .*
+#?  Return address column: .*
+#?  Augmentation data:     03 .. .. .. .. 1b
+#?  DW_CFA_nop
+
 0+01(70|88) 0+0014 0+0(01c|148|15c) FDE cie=0+0(02c|030|170) pc=.*
   DW_CFA_advance_loc: 4 to .*
   DW_CFA_def_cfa: r0(.*) ofs 16
@@ -150,7 +183,18 @@ Contents of the .eh_frame section:
   DW_CFA_nop
   DW_CFA_nop
   DW_CFA_nop
-#...
+
+#?0+01b8 0+0018 0+ CIE
+#?  Version:               1
+#?  Augmentation:          "zPLR"
+#?  Code alignment factor: .*
+#?  Data alignment factor: .*
+#?  Return address column: .*
+#?  Augmentation data:     03 .. .. .. .. 0c 1b
+#?  DW_CFA_nop
+#?  DW_CFA_nop
+#?  DW_CFA_nop
+
 0+01(a0|b8|d4) 0+001c 0+0(020|130|144) FDE cie=0+0(074|078|1b8) pc=.*
   Augmentation data:     (ef be ad de 00 00 00 00|00 00 00 00 de ad be ef)