Changed in v2:
* updated for change from diagnostic_location_t to
  const diagnostic_physical_location *
* fix #if USE_DIAGNOSTICS to retain context and listing code

Output from the example below with v2 is now:

testsuite/gas/all/warn-1.s:3: warning: a warning message
    3 |  .warning "a warning message"   ;# { dg-warning "Warning: a warning 
message" }
testsuite/gas/all/warn-1.s:4: error: .warning argument must be a string
    4 |  .warning a warning message     ;# { dg-error "Error: .warning argument 
must be a string" }
testsuite/gas/all/warn-1.s:5: warning: .warning directive invoked in source file
    5 |  .warning                       ;# { dg-warning "Warning: .warning 
directive invoked in source file" }
testsuite/gas/all/warn-1.s:6: warning: .warning directive invoked in source file
    6 |  .warning ".warning directive invoked in source file"   ;# { dg-warning 
"Warning: .warning directive invoked in source file" }
testsuite/gas/all/warn-1.s:7: warning: 
    7 |  .warning ""                    ;# { dg-warning "Warning: " }

and there's also now a way to toggle quoting of the source code (perhaps
for use in the testsuite)


Blurb from v1:
Here's a patch for gas in binutils that makes it use libdiagnostics
(with some nasty hardcoded paths to specific places on my hard drive
to make it easier to develop the API).

For now this hardcodes adding two sinks: a text sink on stderr, and
also a SARIF output to stderr (which happens after all regular output).

For example, without this patch:

   gas testsuite/gas/all/warn-1.s

emits:
VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV
testsuite/gas/all/warn-1.s: Assembler messages:
testsuite/gas/all/warn-1.s:3: Warning: a warning message
testsuite/gas/all/warn-1.s:4: Error: .warning argument must be a string
testsuite/gas/all/warn-1.s:5: Warning: .warning directive invoked in source file
testsuite/gas/all/warn-1.s:6: Warning: .warning directive invoked in source file
testsuite/gas/all/warn-1.s:7: Warning:
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

whereas with this patch:
  LD_LIBRARY_PATH=/home/david/coding-3/gcc-newgit-canvas-2023/build/gcc 
./as-new testsuite/gas/all/warn-1.s
emits:

VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV
testsuite/gas/all/warn-1.s:3: warning: a warning message
    3 |  .warning "a warning message"   ;# { dg-warning "Warning: a warning 
message" }
      |
testsuite/gas/all/warn-1.s:4: error: .warning argument must be a string
    4 |  .warning a warning message     ;# { dg-error "Error: .warning argument 
must be a string" }
      |
testsuite/gas/all/warn-1.s:5: warning: .warning directive invoked in source file
    5 |  .warning                       ;# { dg-warning "Warning: .warning 
directive invoked in source file" }
      |
testsuite/gas/all/warn-1.s:6: warning: .warning directive invoked in source file
    6 |  .warning ".warning directive invoked in source file"   ;# { dg-warning 
"Warning: .warning directive invoked in source file" }
      |
testsuite/gas/all/warn-1.s:7: warning:
    7 |  .warning ""                    ;# { dg-warning "Warning: " }
      |
        {"$schema": 
"https://raw.githubusercontent.com/oasis-tcs/sarif-spec/master/Schemata/sarif-schema-2.1.0.json";,
 "version": "2.1.0", "runs": [{"tool": {"driver": {"rules": []}}, 
"invocations": [{"executionSuccessful": true, "toolExecutionNotifications": 
[]}], "originalUriBaseIds": {"PWD": {"uri": 
"file:///home/david/coding-3/binutils-gdb/gas/"}}, "artifacts": [{"location": 
{"uri": "testsuite/gas/all/warn-1.s", "uriBaseId": "PWD"}, "contents": {"text": 
";# Test .warning directive.\n;# { dg-do assemble }\n .warning \"a warning 
message\"\t;# { dg-warning \"Warning: a warning message\" }\n .warning a 
warning message\t;# { dg-error \"Error: .warning argument must be a string\" 
}\n .warning\t\t\t;# { dg-warning \"Warning: .warning directive invoked in 
source file\" }\n .warning \".warning directive invoked in source file\"\t;# { 
dg-warning \"Warning: .warning directive invoked in source file\" }\n .warning 
\"\"\t\t\t;# { dg-warning \"Warning: \" }\n"}}], "results": [{"ruleId": 
"warning", "level": "warning", "message": {"text": "a warning message"}, 
"locations": [{"physicalLocation": {"artifactLocation": {"uri": 
"testsuite/gas/all/warn-1.s", "uriBaseId": "PWD"}, "region": {"startLine": 3, 
"startColumn": 0, "endColumn": 1}, "contextRegion": {"startLine": 3, "snippet": 
{"text": " .warning \"a warning message\"\t;# { dg-warning \"Warning: a warning 
message\" }\n"}}}}], "relatedLocations": [{"physicalLocation": 
{"artifactLocation": {"uri": "testsuite/gas/all/warn-1.s", "uriBaseId": "PWD"}, 
"region": {"startLine": 4, "startColumn": 0, "endColumn": 1}, "contextRegion": 
{"startLine": 4, "snippet": {"text": " .warning a warning message\t;# { 
dg-error \"Error: .warning argument must be a string\" }\n"}}}, "message": 
{"text": ".warning argument must be a string"}}, {"physicalLocation": 
{"artifactLocation": {"uri": "testsuite/gas/all/warn-1.s", "uriBaseId": "PWD"}, 
"region": {"startLine": 5, "startColumn": 0, "endColumn": 1}, "contextRegion": 
{"startLine": 5, "snippet": {"text": " .warning\t\t\t;# { dg-warning \"Warning: 
.warning directive invoked in source file\" }\n"}}}, "message": {"text": 
".warning directive invoked in source file"}}, {"physicalLocation": 
{"artifactLocation": {"uri": "testsuite/gas/all/warn-1.s", "uriBaseId": "PWD"}, 
"region": {"startLine": 6, "startColumn": 0, "endColumn": 1}, "contextRegion": 
{"startLine": 6, "snippet": {"text": " .warning \".warning directive invoked in 
source file\"\t;# { dg-warning \"Warning: .warning directive invoked in source 
file\" }\n"}}}, "message": {"text": ".warning directive invoked in source 
file"}}, {"physicalLocation": {"artifactLocation": {"uri": 
"testsuite/gas/all/warn-1.s", "uriBaseId": "PWD"}, "region": {"startLine": 7, 
"startColumn": 0, "endColumn": 1}, "contextRegion": {"startLine": 7, "snippet": 
{"text": " .warning \"\"\t\t\t;# { dg-warning \"Warning: \" }\n"}}}, "message": 
{"text": ""}}]}]}]}
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

For reference, running that SARIF through "python -m json.tool" to
prettyify it gives:

VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV
{
    "$schema": 
"https://raw.githubusercontent.com/oasis-tcs/sarif-spec/master/Schemata/sarif-schema-2.1.0.json";,
    "version": "2.1.0",
    "runs": [
        {
            "tool": {
                "driver": {
                    "rules": []
                }
            },
            "invocations": [
                {
                    "executionSuccessful": true,
                    "toolExecutionNotifications": []
                }
            ],
            "originalUriBaseIds": {
                "PWD": {
                    "uri": "file:///home/david/coding-3/binutils-gdb/gas/"
                }
            },
            "artifacts": [
                {
                    "location": {
                        "uri": "testsuite/gas/all/warn-1.s",
                        "uriBaseId": "PWD"
                    },
                    "contents": {
                        "text": ";# Test .warning directive.\n;# { dg-do 
assemble }\n .warning \"a warning message\"\t;# { dg-warning \"Warning: a 
warning message\" }\n .warning a warning message\t;# { dg-error \"Error: 
.warning argument must be a string\" }\n .warning\t\t\t;# { dg-warning 
\"Warning: .warning directive invoked in source file\" }\n .warning \".warning 
directive invoked in source file\"\t;# { dg-warning \"Warning: .warning 
directive invoked in source file\" }\n .warning \"\"\t\t\t;# { dg-warning 
\"Warning: \" }\n"
                    }
                }
            ],
            "results": [
                {
                    "ruleId": "warning",
                    "level": "warning",
                    "message": {
                        "text": "a warning message"
                    },
                    "locations": [
                        {
                            "physicalLocation": {
                                "artifactLocation": {
                                    "uri": "testsuite/gas/all/warn-1.s",
                                    "uriBaseId": "PWD"
                                },
                                "region": {
                                    "startLine": 3,
                                    "startColumn": 0,
                                    "endColumn": 1
                                },
                                "contextRegion": {
                                    "startLine": 3,
                                    "snippet": {
                                        "text": " .warning \"a warning 
message\"\t;# { dg-warning \"Warning: a warning message\" }\n"
                                    }
                                }
                            }
                        }
                    ],
                    "relatedLocations": [
                        {
                            "physicalLocation": {
                                "artifactLocation": {
                                    "uri": "testsuite/gas/all/warn-1.s",
                                    "uriBaseId": "PWD"
                                },
                                "region": {
                                    "startLine": 4,
                                    "startColumn": 0,
                                    "endColumn": 1
                                },
                                "contextRegion": {
                                    "startLine": 4,
                                    "snippet": {
                                        "text": " .warning a warning 
message\t;# { dg-error \"Error: .warning argument must be a string\" }\n"
                                    }
                                }
                            },
                            "message": {
                                "text": ".warning argument must be a string"
                            }
                        },
                        {
                            "physicalLocation": {
                                "artifactLocation": {
                                    "uri": "testsuite/gas/all/warn-1.s",
                                    "uriBaseId": "PWD"
                                },
                                "region": {
                                    "startLine": 5,
                                    "startColumn": 0,
                                    "endColumn": 1
                                },
                                "contextRegion": {
                                    "startLine": 5,
                                    "snippet": {
                                        "text": " .warning\t\t\t;# { dg-warning 
\"Warning: .warning directive invoked in source file\" }\n"
                                    }
                                }
                            },
                            "message": {
                                "text": ".warning directive invoked in source 
file"
                            }
                        },
                        {
                            "physicalLocation": {
                                "artifactLocation": {
                                    "uri": "testsuite/gas/all/warn-1.s",
                                    "uriBaseId": "PWD"
                                },
                                "region": {
                                    "startLine": 6,
                                    "startColumn": 0,
                                    "endColumn": 1
                                },
                                "contextRegion": {
                                    "startLine": 6,
                                    "snippet": {
                                        "text": " .warning \".warning directive 
invoked in source file\"\t;# { dg-warning \"Warning: .warning directive invoked 
in source file\" }\n"
                                    }
                                }
                            },
                            "message": {
                                "text": ".warning directive invoked in source 
file"
                            }
                        },
                        {
                            "physicalLocation": {
                                "artifactLocation": {
                                    "uri": "testsuite/gas/all/warn-1.s",
                                    "uriBaseId": "PWD"
                                },
                                "region": {
                                    "startLine": 7,
                                    "startColumn": 0,
                                    "endColumn": 1
                                },
                                "contextRegion": {
                                    "startLine": 7,
                                    "snippet": {
                                        "text": " .warning \"\"\t\t\t;# { 
dg-warning \"Warning: \" }\n"
                                    }
                                }
                            },
                            "message": {
                                "text": ""
                            }
                        }
                    ]
                }
            ]
        }
    ]
}
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

gas/ChangeLog:
        * Makefile.am (GASLIBS): Add nasty hack with hardcoded path
        on my hard drive.
        * Makefile.in (GASLIBS): Likewise.
        * as.c (gas_init): Call messages_init.
        (main): Call messages_end.
        * as.h (messages_init): New decl.
        (messages_end): New decl.
        * messages.c (USE_LIBDIAGNOSTICS): New define.
        Add #include with nasty hardcoded path.
        (diag_mgr): New.
        (messages_init): New.
        (messages_end): New.
        (as_warn_internal): Add support for libdiagnostics.
        (as_bad_internal): Likewise.
---
 gas/Makefile.am |  3 ++-
 gas/Makefile.in |  4 +++-
 gas/as.c        |  3 +++
 gas/as.h        |  3 +++
 gas/messages.c  | 60 +++++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 71 insertions(+), 2 deletions(-)

diff --git a/gas/Makefile.am b/gas/Makefile.am
index 0e98ca3ec85..fe92997129c 100644
--- a/gas/Makefile.am
+++ b/gas/Makefile.am
@@ -408,7 +408,8 @@ AM_CPPFLAGS = -I. -I$(srcdir) -I../bfd -I$(srcdir)/config \
 # How to link with both our special library facilities
 # and the system's installed libraries.
 
-GASLIBS = @OPCODES_LIB@ ../bfd/libbfd.la ../libiberty/libiberty.a
+# FIXME:
+GASLIBS = @OPCODES_LIB@ ../bfd/libbfd.la ../libiberty/libiberty.a 
/home/david/coding-3/gcc-newgit-canvas-2023/build/gcc/libdiagnostics.so
 
 # Files to be copied away after each stage in building.
 STAGESTUFF = *.@OBJEXT@ $(noinst_PROGRAMS)
diff --git a/gas/Makefile.in b/gas/Makefile.in
index fae3a47c144..2161d68f9c7 100644
--- a/gas/Makefile.in
+++ b/gas/Makefile.in
@@ -885,7 +885,9 @@ AM_CPPFLAGS = -I. -I$(srcdir) -I../bfd -I$(srcdir)/config \
 
 # How to link with both our special library facilities
 # and the system's installed libraries.
-GASLIBS = @OPCODES_LIB@ ../bfd/libbfd.la ../libiberty/libiberty.a
+
+# FIXME:
+GASLIBS = @OPCODES_LIB@ ../bfd/libbfd.la ../libiberty/libiberty.a 
/home/david/coding-3/gcc-newgit-canvas-2023/build/gcc/libdiagnostics.so
 
 # Files to be copied away after each stage in building.
 STAGESTUFF = *.@OBJEXT@ $(noinst_PROGRAMS)
diff --git a/gas/as.c b/gas/as.c
index 6839c841588..2a8ce3734a0 100644
--- a/gas/as.c
+++ b/gas/as.c
@@ -1300,6 +1300,7 @@ gas_early_init (int *argcp, char ***argvp)
 static void
 gas_init (void)
 {
+  messages_init ();
   symbol_begin ();
   frag_init ();
   subsegs_begin ();
@@ -1486,6 +1487,8 @@ main (int argc, char ** argv)
 
   input_scrub_end ();
 
+  messages_end ();
+
   /* Use xexit instead of return, because under VMS environments they
      may not place the same interpretation on the value given.  */
   if (had_errors () != 0)
diff --git a/gas/as.h b/gas/as.h
index 99ffe77afd2..9d878a87df5 100644
--- a/gas/as.h
+++ b/gas/as.h
@@ -474,6 +474,9 @@ void   as_bad_value_out_of_range (const char *, offsetT, 
offsetT, offsetT,
 void   print_version_id (void);
 char * app_push (void);
 
+void messages_init (void);
+void messages_end (void);
+
 /* Number of littlenums required to hold an extended precision number. */
 #define MAX_LITTLENUMS 6
 
diff --git a/gas/messages.c b/gas/messages.c
index 7c018acf69f..1854560dae7 100644
--- a/gas/messages.c
+++ b/gas/messages.c
@@ -21,6 +21,14 @@
 #include <limits.h>
 #include <signal.h>
 
+// FIXME: do some configury thing for this
+#define USE_LIBDIAGNOSTICS 1
+
+#if USE_LIBDIAGNOSTICS
+// FIXME: need to fix this path, obviously
+#include "/home/david/coding-3/gcc-newgit-canvas-2023/src/gcc/libdiagnostics.h"
+#endif
+
 /* If the system doesn't provide strsignal, we get it defined in
    libiberty but no declaration is supplied.  Because, reasons. */
 #if !defined (HAVE_STRSIGNAL) && !defined (strsignal)
@@ -101,6 +109,29 @@ had_warnings (void)
   return warning_count;
 }
 
+#if USE_LIBDIAGNOSTICS
+static diagnostic_manager *diag_mgr;
+#endif
+
+void messages_init (void)
+{
+#if USE_LIBDIAGNOSTICS
+  diag_mgr = diagnostic_manager_new ();
+  diagnostic_manager_add_text_sink (diag_mgr, stderr,
+                                   DIAGNOSTIC_COLORIZE_IF_TTY);
+  diagnostic_manager_add_sarif_sink (diag_mgr, stderr,
+                                    DIAGNOSTIC_SARIF_VERSION_2_1_0);
+#endif
+}
+
+void messages_end (void)
+{
+#if USE_LIBDIAGNOSTICS
+  diagnostic_manager_release (diag_mgr);
+  diag_mgr = NULL;
+#endif
+}
+
 /* Nonzero if we've hit a 'bad error', and should not write an obj file,
    and exit with a nonzero error code.  */
 
@@ -182,6 +213,20 @@ as_warn_internal (const char *file, unsigned int line, 
char *buffer)
       context = true;
     }
 
+#if USE_LIBDIAGNOSTICS
+  const diagnostic_file *file_obj
+    = diagnostic_manager_new_file (diag_mgr, file, NULL);
+
+  const diagnostic_physical_location *loc
+    = diagnostic_manager_new_location_from_file_and_line (diag_mgr,
+                                                         file_obj,
+                                                         line);
+
+  diagnostic *d = diagnostic_begin (diag_mgr,
+                                   DIAGNOSTIC_LEVEL_WARNING);
+  diagnostic_set_location (d, loc);
+  diagnostic_finish (d, "%s", buffer);
+#else
   identify (file);
   if (file)
     {
@@ -192,6 +237,7 @@ as_warn_internal (const char *file, unsigned int line, char 
*buffer)
     }
   else
     fprintf (stderr, "%s%s\n", _("Warning: "), buffer);
+#endif /* #else clause of #if USE_LIBDIAGNOSTICS */
 
   if (context)
     as_report_context ();
@@ -256,6 +302,19 @@ as_bad_internal (const char *file, unsigned int line, char 
*buffer)
       context = true;
     }
 
+#if USE_LIBDIAGNOSTICS
+  const diagnostic_file *file_obj
+    = diagnostic_manager_new_file (diag_mgr, file, NULL);
+  const diagnostic_physical_location *loc
+    = diagnostic_manager_new_location_from_file_and_line (diag_mgr,
+                                                         file_obj,
+                                                         line);
+
+  diagnostic *d = diagnostic_begin (diag_mgr,
+                                   DIAGNOSTIC_LEVEL_ERROR);
+  diagnostic_set_location (d, loc);
+  diagnostic_finish (d, "%s", buffer);
+#else
   identify (file);
   if (file)
     {
@@ -266,6 +325,7 @@ as_bad_internal (const char *file, unsigned int line, char 
*buffer)
     }
   else
     fprintf (stderr, "%s%s\n", _("Error: "), buffer);
+#endif /* #else clause of #if USE_LIBDIAGNOSTICS */
 
   if (context)
     as_report_context ();
-- 
2.26.3

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