readelf, libdw: Add GNU DebugFission .debug_loc support.

GNU DebugFission .debug_loc location lists uses the .debug_loc section
in the split dwarf .dwo file. The encoding is a mix of old style DWARF
.debug_loc and new style .debug_loclists.

Add two testcases for the readelf and libdw decoders.

Signed-off-by: Mark Wielaard <[email protected]>

3 files changed, 220 insertions, 0 deletions

diff --git a/tests/ChangeLog b/tests/ChangeLog
index 682fffcd..2b255c72 100644
--- a/tests/ChangeLog
+++ b/tests/ChangeLog
@@ -1,5 +1,10 @@
 2018-05-29  Mark Wielaard  <[email protected]>
 
+	* run-readelf-loc.sh: Add GNU DebugFission split-dwarf variant.
+	* run-varlocs.sh: Likewise.
+
+2018-05-29  Mark Wielaard  <[email protected]>
+
 	* run-readelf-twofiles.sh: Add --debug-dump=loc testcase.
 
 2018-05-28  Mark Wielaard  <[email protected]>
diff --git a/tests/run-readelf-loc.sh b/tests/run-readelf-loc.sh
index 622cc196..484db466 100755
--- a/tests/run-readelf-loc.sh
+++ b/tests/run-readelf-loc.sh
@@ -727,4 +727,145 @@ Table at Offset 0x0:
 
 EOF
 
+# GNU DebugFission split-dwarf variant. Still uses .debug_loc, but now in
+# .dwo file, with somewhat similar, but different encoding from DWARF5.
+testfiles testfile-splitdwarf-4 testfile-hello4.dwo testfile-world4.dwo
+testrun_compare ${abs_top_builddir}/src/readelf --debug-dump=loc --dwarf-skeleton=testfile-splitdwarf-4 testfile-hello4.dwo testfile-world4.dwo <<\EOF
+
+testfile-hello4.dwo:
+
+
+DWARF section [ 3] '.debug_loc.dwo' at offset 0x253:
+
+ CU [     b] base: 0x0000000000401160 <foo>
+ [     0] range 401160, 40116a
+          0x0000000000401160 <foo>..
+          0x0000000000401169 <foo+0x9>
+           [ 0] reg5
+          range 40116a, 401194
+          0x000000000040116a <foo+0xa>..
+          0x0000000000401193 <foo+0x33>
+           [ 0] GNU_entry_value:
+                [ 0] reg5
+           [ 3] stack_value
+ [    16] range 40117b, 40118d
+          0x000000000040117b <foo+0x1b>..
+          0x000000000040118c <foo+0x2c>
+           [ 0] GNU_addr_index [18] 0x404038 <m>
+ [    21] range 40117b, 401181
+          0x000000000040117b <foo+0x1b>..
+          0x0000000000401180 <foo+0x20>
+           [ 0] reg5
+ [    2b] range 40117b, 401187
+          0x000000000040117b <foo+0x1b>..
+          0x0000000000401186 <foo+0x26>
+           [ 0] reg5
+          range 401189, 40118d
+          0x0000000000401189 <foo+0x29>..
+          0x000000000040118c <foo+0x2c>
+           [ 0] reg5
+ [    3e] range 401181, 401187
+          0x0000000000401181 <foo+0x21>..
+          0x0000000000401186 <foo+0x26>
+           [ 0] reg5
+          range 401189, 40118d
+          0x0000000000401189 <foo+0x29>..
+          0x000000000040118c <foo+0x2c>
+           [ 0] reg5
+ [    51] range 401181, 40118d
+          0x0000000000401181 <foo+0x21>..
+          0x000000000040118c <foo+0x2c>
+           [ 0] reg5
+ [    5b] range 40118d, 401193
+          0x000000000040118d <foo+0x2d>..
+          0x0000000000401192 <foo+0x32>
+           [ 0] reg5
+ [    65] range 4011a0, 4011af
+          0x00000000004011a0 <baz>..
+          0x00000000004011ae <baz+0xe>
+           [ 0] reg5
+          range 4011af, 4011b1
+          0x00000000004011af <baz+0xf>..
+          0x00000000004011b0 <baz+0x10>
+           [ 0] GNU_entry_value:
+                [ 0] reg5
+           [ 3] stack_value
+ [    7b] range 4011a0, 4011b0
+          0x00000000004011a0 <baz>..
+          0x00000000004011af <baz+0xf>
+           [ 0] reg5
+
+testfile-world4.dwo:
+
+
+DWARF section [ 3] '.debug_loc.dwo' at offset 0x225:
+
+ CU [     b] base: 000000000000000000
+ [     0] range 401060, 401074
+          0x0000000000401060 <main>..
+          0x0000000000401073 <main+0x13>
+           [ 0] reg5
+          range 401074, 401080
+          0x0000000000401074 <main+0x14>..
+          0x000000000040107f <main+0x1f>
+           [ 0] GNU_entry_value:
+                [ 0] reg5
+           [ 3] stack_value
+ [    16] range 401060, 401078
+          0x0000000000401060 <main>..
+          0x0000000000401077 <main+0x17>
+           [ 0] reg4
+          range 401078, 40107e
+          0x0000000000401078 <main+0x18>..
+          0x000000000040107d <main+0x1d>
+           [ 0] GNU_entry_value:
+                [ 0] reg4
+           [ 3] stack_value
+ [    2c] range 401071, 401078
+          0x0000000000401071 <main+0x11>..
+          0x0000000000401077 <main+0x17>
+           [ 0] reg0
+ [    36] range 4011c0, 4011c8
+          0x00000000004011c0 <calc>..
+          0x00000000004011c7 <calc+0x7>
+           [ 0] reg5
+          range 4011c8, 4011eb
+          0x00000000004011c8 <calc+0x8>..
+          0x00000000004011ea <calc+0x2a>
+           [ 0] GNU_entry_value:
+                [ 0] reg5
+           [ 3] stack_value
+ [    4c] range 4011d8, 4011e3
+          0x00000000004011d8 <calc+0x18>..
+          0x00000000004011e2 <calc+0x22>
+           [ 0] reg0
+ [    56] range 4011d8, 4011da
+          0x00000000004011d8 <calc+0x18>..
+          0x00000000004011d9 <calc+0x19>
+           [ 0] reg1
+          range 4011da, 4011df
+          0x00000000004011da <calc+0x1a>..
+          0x00000000004011de <calc+0x1e>
+           [ 0] reg5
+          range 4011df, 4011e3
+          0x00000000004011df <calc+0x1f>..
+          0x00000000004011e2 <calc+0x22>
+           [ 0] GNU_entry_value:
+                [ 0] reg5
+           [ 3] deref_size 1
+           [ 5] const1u 56
+           [ 7] shl
+           [ 8] const1u 56
+           [10] shra
+           [11] stack_value
+ [    7d] range 4011d8, 4011da
+          0x00000000004011d8 <calc+0x18>..
+          0x00000000004011d9 <calc+0x19>
+           [ 0] reg1
+          range 4011da, 4011e3
+          0x00000000004011da <calc+0x1a>..
+          0x00000000004011e2 <calc+0x22>
+           [ 0] reg5
+EOF
+
 exit 0
diff --git a/tests/run-varlocs.sh b/tests/run-varlocs.sh
index 8426d20d..e98d8e94 100755
--- a/tests/run-varlocs.sh
+++ b/tests/run-varlocs.sh
@@ -277,6 +277,80 @@ module 'testfilesplitranges5.debug'
       [4011c0,4011d0) {reg4}
 EOF
 
+# GNU DebugFissuon Multi CU Split DWARF. See run-dwarf-ranges.sh.
+testfiles testfilesplitranges4.debug
+testfiles testfile-ranges-hello.dwo testfile-ranges-world.dwo
+testrun_compare ${abs_top_builddir}/tests/varlocs --debug -e testfilesplitranges4.debug <<\EOF
+module 'testfilesplitranges4.debug'
+[b] CU 'hello.c'
+  [18] function 'no_say'@4004f0
+    frame_base: {call_frame_cfa {...}}
+    [2f] parameter 'prefix'
+      [4004f0,4004fa) {reg5}
+      [4004fa,4004ff) {GNU_entry_value(1) {reg5}, stack_value}
+    [3b] variable 'world'
+      <no value>
+  [60] function 'main'@4003e0
+    frame_base: {call_frame_cfa {...}}
+    [77] parameter 'argc'
+      [4003e0,4003f2) {reg5}
+      [4003f2,4003f7) {GNU_entry_value(1) {reg5}, stack_value}
+    [83] parameter 'argv'
+      [4003e0,4003f6) {reg4}
+      [4003f6,1004003f5) {GNU_entry_value(1) {reg4}, stack_value}
+  [8f] inlined function 'subject'@4003e3
+    [a3] parameter 'count'
+      [4003e3,4003ef) {reg5}
+    [ac] parameter 'word'
+      [4003e3,4003ef) {reg0}
+  [e7] function 'subject'@4004e0
+    frame_base: {call_frame_cfa {...}}
+    [fb] parameter 'word'
+      [4004e0,4004f0) {reg5}
+    [102] parameter 'count'
+      [4004e0,4004f0) {reg4}
+module 'testfilesplitranges4.debug'
+[b] CU 'world.c'
+  [18] function 'no_main'@400550
+    frame_base: {call_frame_cfa {...}}
+    [2f] parameter 'argc'
+      [400550,400562) {reg5}
+      [400562,400567) {GNU_entry_value(1) {reg5}, stack_value}
+    [3b] parameter 'argv'
+      [400550,400566) {reg4}
+      [400566,100400565) {GNU_entry_value(1) {reg4}, stack_value}
+  [47] inlined function 'no_subject'@400553
+    [5b] parameter 'count'
+      [400553,40055f) {reg5}
+    [64] parameter 'word'
+      [400553,40055f) {reg0}
+  [af] function 'say'@400500
+    frame_base: {call_frame_cfa {...}}
+    [c9] parameter 'prefix'
+      [400500,40050e) {reg5}
+      [40050e,40051c) {reg3}
+      [40051c,400527) {GNU_entry_value(1) {reg5}, stack_value}
+      [400527,400535) {reg3}
+      [400535,400540) {GNU_entry_value(1) {reg5}, stack_value}
+    [d5] variable 'world'
+      [400513,40051b) {reg0}
+      [400527,400534) {reg0}
+  [e1] inlined function 'happy'@40051c
+    [f1] parameter 'w'
+      [400527,400534) {reg0}
+  [fa] inlined function 'sad'@40051c
+    [106] parameter 'c'
+      [40051b,400526) {reg0}
+      [400526,400527) {GNU_entry_value(1) {reg5}}
+      [400534,40053f) {reg0}
+  [15c] function 'no_subject'@400540
+    frame_base: {call_frame_cfa {...}}
+    [170] parameter 'word'
+      [400540,400550) {reg5}
+    [177] parameter 'count'
+      [400540,400550) {reg4}
+EOF
+
 # DW_OP_addrx and DW_OP_constx testcases.
 #
 # int i, j, k;