testsuite: clarify scan-dump file globbing behavior

The test commands for scanning optimization dump files
perform globbing on the argument that specifies the suffix
of the dump files to be scanned.  This behavior is currently
undocumented.  Furthermore, the current implementation of
"scan-dump" and similar procedures yields an error whenever
the file name globbing matches more than one file (due to an
attempt to call "open" on multiple files) while a failure to
match any file results in an unresolved test.

This commit documents the globbing behavior.  The dump
scanning procedures are changed to make the test unresolved
if globbing matches more than one file.

gcc/ChangeLog:

2020-06-29  Frederik Harwath  <frederik@codesourcery.com>

	* doc/sourcebuild.texi: Describe globbing of the
	dump file scanning commands "suffix" argument.

gcc/testsuite/ChangeLog:

2020-06-29  Frederik Harwath  <frederik@codesourcery.com>

	* lib/scandump.exp (glob-dump-file): New proc.
	(scan-dump): Use glob-dump-file for file name expansion.
	(scan-dump-times): Likewise.
	(scan-dump-dem): Likewise.
	(scan-dump-dem-not): Likewise.

Reviewed-by: Thomas Schwinge <thomas@codesourcery.com>

diff --git a/gcc/doc/sourcebuild.texi b/gcc/doc/sourcebuild.texi
index a12af82..5b5b845 100644 (file)
--- a/gcc/doc/sourcebuild.texi
+++ b/gcc/doc/sourcebuild.texi
@@ -2943,6 +2943,19 @@ Passes if @var{regex} does not match demangled text in the dump file with
 suffix @var{suffix}.
 @end table
 
+The @var{suffix} argument which describes the dump file to be scanned
+may contain a glob pattern that must expand to exactly one file
+name. This is useful if, e.g., different pass instances are executed
+depending on torture testing command-line flags, producing dump files
+whose names differ only in their pass instance number suffix.  For
+example, to scan instances 1, 2, 3 of a tree pass ``mypass'' for
+occurrences of the string ``code has been optimized'', use:
+@smallexample
+/* @{ dg-options "-fdump-tree-mypass" @} */
+/* @{ dg-final @{ scan-tree-dump "code has been optimized" "mypass\[1-3\]" @} @} */
+@end smallexample
+
+
 @subsubsection Check for output files
 
 @table @code

diff --git a/gcc/testsuite/lib/scandump.exp b/gcc/testsuite/lib/scandump.exp
index 2479c89..6cb208f 100644 (file)
--- a/gcc/testsuite/lib/scandump.exp
+++ b/gcc/testsuite/lib/scandump.exp
@@ -42,6 +42,34 @@ proc dump-base { args } {
     return $dumpbase
 }
 
+# Expand dump file name pattern to exactly one file.
+# Return a single dump file name or an empty string
+# if the pattern matches no file or more than one file.
+#
+# Argument 0 is the testcase name
+# Argument 1 is the dump file glob pattern
+proc glob-dump-file { args } {
+
+    set pattern [lindex $args 1]
+    set dump_file "[glob -nocomplain $pattern]"
+    set num_files [llength $dump_file]
+
+    if { $num_files != 1 } {
+       set testcase [lindex $args 0]
+       if { $num_files == 0 } {
+           verbose -log "$testcase: dump file does not exist"
+       }
+
+       if { $num_files > 1 } {
+           verbose -log "$testcase: multiple dump files found"
+       }
+
+       return
+    }
+
+    return $dump_file
+}
+
 # Utility for scanning compiler result, invoked via dg-final.
 # Call pass if pattern is present, otherwise fail.
 #
@@ -70,10 +98,10 @@ proc scan-dump { args } {
     set testname "$testcase scan-[lindex $args 0]-dump $suf \"$printable_pattern\""
     set src [file tail $filename]
     set dumpbase [dump-base $src [lindex $args 3]]
-    set output_file "[glob -nocomplain $dumpbase.[lindex $args 2]]"
+
+    set pattern "$dumpbase.[lindex $args 2]"
+    set output_file "[glob-dump-file $testcase $pattern]"
     if { $output_file == "" } {
-       verbose -log "$testcase: dump file does not exist"
-       verbose -log "dump file: $dumpbase.$suf"
        unresolved "$testname"
        return
     }
@@ -116,9 +144,10 @@ proc scan-dump-times { args } {
     set testname "$testcase scan-[lindex $args 0]-dump-times $suf \"$printable_pattern\" [lindex $args 2]"
     set src [file tail $filename]
     set dumpbase [dump-base $src [lindex $args 4]]
-    set output_file "[glob -nocomplain $dumpbase.[lindex $args 3]]"
+
+    set pattern "$dumpbase.[lindex $args 3]"
+    set output_file "[glob-dump-file $testcase $pattern]"
     if { $output_file == "" } {
-       verbose -log "$testcase: dump file does not exist"
        unresolved "$testname"
        return
     }
@@ -162,9 +191,10 @@ proc scan-dump-not { args } {
     set testname "$testcase scan-[lindex $args 0]-dump-not $suf \"$printable_pattern\""
     set src [file tail $filename]
     set dumpbase [dump-base $src [lindex $args 3]]
-    set output_file "[glob -nocomplain $dumpbase.[lindex $args 2]]"
+
+    set pattern "$dumpbase.[lindex $args 2]"
+    set output_file "[glob-dump-file $testcase $pattern]"
     if { $output_file == "" } {
-       verbose -log "$testcase: dump file does not exist"
        unresolved "$testname"
        return
     }
@@ -219,9 +249,10 @@ proc scan-dump-dem { args } {
     set testname "$testcase scan-[lindex $args 0]-dump-dem $suf \"$printable_pattern\""
     set src [file tail $filename]
     set dumpbase [dump-base $src [lindex $args 3]]
-    set output_file "[glob -nocomplain $dumpbase.[lindex $args 2]]"
+
+    set pattern "$dumpbase.[lindex $args 2]"
+    set output_file "[glob-dump-file $testcase $pattern]"
     if { $output_file == "" } {
-       verbose -log "$testcase: dump file does not exist"
        unresolved "$testname"
        return
     }
@@ -275,9 +306,10 @@ proc scan-dump-dem-not { args } {
     set testname "$testcase scan-[lindex $args 0]-dump-dem-not $suf \"$printable_pattern\""
     set src [file tail $filename]
     set dumpbase [dump-base $src [lindex $args 3]]
-    set output_file "[glob -nocomplain $dumpbase.[lindex $args 2]]"
+
+    set pattern "$dumpbase.[lindex $args 2]"
+    set output_file "[glob-dump-file $testcase $pattern]"
     if { $output_file == "" } {
-       verbose -log "$testcase: dump file does not exist"
        unresolved "$testname"
        return
     }