File 1147-erts-Add-test-case-for-erlang-style-labels... of Package erlang

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File 1147-erts-Add-test-case-for-erlang-style-labels-in-asm-du.patch of Package erlang (Revision b47b3d0a87f21630280b8ed6f4d34508)

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From 0d2743ad623449bacbdacf428bc308d1f6e47c50 Mon Sep 17 00:00:00 2001
From: Frej Drejhammar <frej.drejhammar@gmail.com>
Date: Mon, 21 Jun 2021 14:40:19 +0200
Subject: [PATCH 7/7] erts: Add test case for erlang-style labels in asm dump

Check that pretty printing of named labels is working. We do that by
loading the test suite module in an emulator running with +JDdump true
and then checking that the produced jit_SUITE.asm contains a label for
each exported function. We also check that the label for the
non-exported function get_tmp_asm_files/0, which is used by this test,
is present.
---
 erts/emulator/test/jit_SUITE.erl | 80 ++++++++++++++++++++++++++++++--
 1 file changed, 76 insertions(+), 4 deletions(-)

diff --git a/erts/emulator/test/jit_SUITE.erl b/erts/emulator/test/jit_SUITE.erl
index d67eab0e7d..d5acc11cf8 100644
--- a/erts/emulator/test/jit_SUITE.erl
+++ b/erts/emulator/test/jit_SUITE.erl
@@ -22,8 +22,9 @@
 
 -export([suite/0, groups/0, all/0,
          init_per_suite/1, end_per_suite/1,
-         init_per_group/2, end_per_group/2]).
--export([symbols/1, annotate/1]).
+         init_per_group/2, end_per_group/2,
+         init_per_testcase/2, end_per_testcase/2]).
+-export([annotate/1, named_labels/1, symbols/1]).
 
 suite() ->
     [{timetrap, {minutes, 4}}].
@@ -32,7 +33,7 @@ groups() ->
     [{perf, [symbols, annotate]}].
 
 all() ->
-    [{group, perf}].
+    [{group, perf}, named_labels].
 
 init_per_suite(Config) ->
     case erlang:system_info(emu_flavor) of
@@ -101,6 +102,29 @@ end_per_group(perf, Config) ->
 end_per_group(_, _Config) ->
     ok.
 
+init_per_testcase(named_labels, Config) ->
+    %% Only run named_labels on platforms where we know it works.
+    case erlang:system_info(system_architecture) of
+	"x86" ++ _ ->
+	    [{asmbefore,get_tmp_asm_files()}|Config];
+	"aarch64" ++ _ ->
+	    [{asmbefore,get_tmp_asm_files()}|Config];
+	_ ->
+	    {skip, "Unsupported architecture"}
+    end;
+init_per_testcase(_Case, Config) ->
+    Config.
+
+end_per_testcase(named_labels, Config) ->
+    AsmToDelete = get_tmp_asm_files() -- proplists:get_value(asmbefore, Config),
+    lists:foreach(
+      fun(File) ->
+              ok = file:delete(File)
+      end, AsmToDelete),
+    ok;
+end_per_testcase(_, _Config) ->
+    ok.
+
 get_tmp_so_files() ->
     {ok, Home} = init:get_argument(home),
     filelib:wildcard("/tmp/jitted-*.so") ++
@@ -148,4 +172,52 @@ annotate(Config) ->
             ct:log("Did not find disassembly test for ~ts.~n~ts",
                    [Symbol, Anno])
     end.
-    
+
+get_tmp_asm_files() ->
+    {ok, Cwd} = file:get_cwd(),
+    filelib:wildcard(filename:join(Cwd, "*.asm")).
+
+named_labels(_Config) ->
+    %% Check that pretty printing of named labels is working. We do
+    %% that by loading this module in an emulator running with +JDdump
+    %% true and then checking that the produced jit_SUITE.asm contains
+    %% a label for each exported function. We also check that the
+    %% label for the non-exported function get_tmp_asm_files/0, which
+    %% is used by this test, is present.
+    Exports = proplists:get_value(exports, ?MODULE:module_info()),
+    ModName = atom_to_list(?MODULE),
+    ModulePath = filename:dirname(code:which(?MODULE)),
+    Cmd = "erl +JDdump true -noshell -pa " ++ ModulePath ++ " -eval \""
+        ++ ModName ++ ":module_info(),erlang:halt(0).\"",
+    os:cmd(Cmd),
+    {ok, Cwd} = file:get_cwd(),
+    AsmFile = filename:join(Cwd, ModName ++ ".asm"),
+    {ok, Data} = file:read_file(AsmFile),
+    Expected = sets:from_list([ lists:flatten(io_lib:format("~p/~p", [N,A]))
+                                || {N,A} <- Exports]
+                              ++ ["get_tmp_asm_files/0"]),
+    StripSeqNo = fun(Lbl) ->
+                         %% In the Arm JIT, labels have the form
+                         %% @Mod:Name/Arity-SequenceNumber, so strip
+                         %% out the Mod part and the sequence number
+                         %% as we can't know anything about them.
+                         case re:run(Lbl, "^.*\:(.*)-[0-9]*$",
+                                     [{capture,all_but_first,list}]) of
+                             {match,[R]} -> R;
+                             nomatch -> Lbl
+                         end
+                 end,
+    case re:run(Data, "^(.*)\:\n",
+                [global,multiline,{capture,all_but_first,list}]) of
+        {match,Labels} ->
+            Found = sets:from_list([ StripSeqNo(NA) || [NA] <- Labels]),
+            case sets:is_subset(Expected, Found) of
+                true ->
+                    ok;
+                false ->
+                    ct:fail("Expected ~p, found ~p",
+                            [sets:to_list(Expected), sets:to_list(Found)])
+            end;
+        _ ->
+            ct:fail("No labels found in assembly dump")
+    end.
-- 
2.26.2

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