Rollup merge of rust-lang#120656 - Zalathar:filecheck-flags, r=wesleywiser

Allow tests to specify a `//@ filecheck-flags:` header

This allows individual codegen/assembly/mir-opt tests to pass extra flags to the LLVM `filecheck` tool as needed.

---

The original motivation was noticing that `tests/run-make/instrument-coverage` was very close to being an ordinary codegen test, except that it needs some extra logic to set up platform-specific variables to be passed into filecheck.

I then saw the comment in `verify_with_filecheck` indicating that a `filecheck-flags` header might be useful for other purposes as well.

Author: GuillaumeGomez

src/tools/compiletest/src/header.rs

@@ -197,6 +197,8 @@ pub struct TestProps {
     /// Extra flags to pass to `llvm-cov` when producing coverage reports.
     /// Only used by the "coverage-run" test mode.
     pub llvm_cov_flags: Vec<String>,
+    /// Extra flags to pass to LLVM's `filecheck` tool, in tests that use it.
+    pub filecheck_flags: Vec<String>,
 }
 
 mod directives {
@@ -236,6 +238,7 @@ mod directives {
     pub const REMAP_SRC_BASE: &'static str = "remap-src-base";
     pub const COMPARE_OUTPUT_LINES_BY_SUBSET: &'static str = "compare-output-lines-by-subset";
     pub const LLVM_COV_FLAGS: &'static str = "llvm-cov-flags";
+    pub const FILECHECK_FLAGS: &'static str = "filecheck-flags";
     // This isn't a real directive, just one that is probably mistyped often
     pub const INCORRECT_COMPILER_FLAGS: &'static str = "compiler-flags";
 }
@@ -286,6 +289,7 @@ impl TestProps {
             mir_unit_test: None,
             remap_src_base: false,
             llvm_cov_flags: vec![],
+            filecheck_flags: vec![],
         }
     }
 
@@ -542,6 +546,10 @@ impl TestProps {
                     if let Some(flags) = config.parse_name_value_directive(ln, LLVM_COV_FLAGS) {
                         self.llvm_cov_flags.extend(split_flags(&flags));
                     }
+
+                    if let Some(flags) = config.parse_name_value_directive(ln, FILECHECK_FLAGS) {
+                        self.filecheck_flags.extend(split_flags(&flags));
+                    }
                 },
             );
 

src/tools/compiletest/src/runtest.rs

@@ -2909,25 +2909,32 @@ impl<'test> TestCx<'test> {
     fn verify_with_filecheck(&self, output: &Path) -> ProcRes {
         let mut filecheck = Command::new(self.config.llvm_filecheck.as_ref().unwrap());
         filecheck.arg("--input-file").arg(output).arg(&self.testpaths.file);
-        // It would be more appropriate to make most of the arguments configurable through
-        // a comment-attribute similar to `compile-flags`. For example, --check-prefixes is a very
-        // useful flag.
-        //
-        // For now, though…
-        let prefix_for_target =
-            if self.config.target.contains("msvc") { "MSVC" } else { "NONMSVC" };
-        let prefixes = if let Some(rev) = self.revision {
-            format!("CHECK,{},{}", prefix_for_target, rev)
-        } else {
-            format!("CHECK,{}", prefix_for_target)
-        };
-        if self.config.llvm_version.unwrap_or(0) >= 130000 {
-            filecheck.args(&["--allow-unused-prefixes", "--check-prefixes", &prefixes]);
-        } else {
-            filecheck.args(&["--check-prefixes", &prefixes]);
+
+        // FIXME: Consider making some of these prefix flags opt-in per test,
+        // via `filecheck-flags` or by adding new header directives.
+
+        // Because we use custom prefixes, we also have to register the default prefix.
+        filecheck.arg("--check-prefix=CHECK");
+
+        // Some tests use the current revision name as a check prefix.
+        if let Some(rev) = self.revision {
+            filecheck.arg("--check-prefix").arg(rev);
         }
+
+        // Some tests also expect either the MSVC or NONMSVC prefix to be defined.
+        let msvc_or_not = if self.config.target.contains("msvc") { "MSVC" } else { "NONMSVC" };
+        filecheck.arg("--check-prefix").arg(msvc_or_not);
+
+        // The filecheck tool normally fails if a prefix is defined but not used.
+        // However, we define several prefixes globally for all tests.
+        filecheck.arg("--allow-unused-prefixes");
+
         // Provide more context on failures.
         filecheck.args(&["--dump-input-context", "100"]);
+
+        // Add custom flags supplied by the `filecheck-flags:` test header.
+        filecheck.args(&self.props.filecheck_flags);
+
         self.compose_and_run(filecheck, "", None, None)
     }
 

tests/codegen/instrument-coverage-off.rs renamed to tests/codegen/instrument-coverage/instrument-coverage-off.rs

@@ -0,0 +1,120 @@
+//@ edition: 2021
+//@ needs-profiler-support
+//@ compile-flags: -Cinstrument-coverage -Copt-level=0
+//@ revisions: LINUX DARWIN WINDOWS
+
+//@ [LINUX] only-linux
+//@ [LINUX] filecheck-flags: -DINSTR_PROF_DATA=__llvm_prf_data
+//@ [LINUX] filecheck-flags: -DINSTR_PROF_NAME=__llvm_prf_names
+//@ [LINUX] filecheck-flags: -DINSTR_PROF_CNTS=__llvm_prf_cnts
+//@ [LINUX] filecheck-flags: -DINSTR_PROF_COVMAP=__llvm_covmap
+//@ [LINUX] filecheck-flags: -DINSTR_PROF_COVFUN=__llvm_covfun
+//@ [LINUX] filecheck-flags: '-DCOMDAT_IF_SUPPORTED=, comdat'
+
+//@ [DARWIN] only-macos
+//@ [DARWIN] filecheck-flags: -DINSTR_PROF_DATA=__DATA,__llvm_prf_data,regular,live_support
+//@ [DARWIN] filecheck-flags: -DINSTR_PROF_NAME=__DATA,__llvm_prf_names
+//@ [DARWIN] filecheck-flags: -DINSTR_PROF_CNTS=__DATA,__llvm_prf_cnts
+//@ [DARWIN] filecheck-flags: -DINSTR_PROF_COVMAP=__LLVM_COV,__llvm_covmap
+//@ [DARWIN] filecheck-flags: -DINSTR_PROF_COVFUN=__LLVM_COV,__llvm_covfun
+//@ [DARWIN] filecheck-flags: -DCOMDAT_IF_SUPPORTED=
+
+//@ [WINDOWS] only-windows
+//@ [WINDOWS] filecheck-flags: -DINSTR_PROF_DATA=.lprfd$M
+//@ [WINDOWS] filecheck-flags: -DINSTR_PROF_NAME=.lprfn$M
+//@ [WINDOWS] filecheck-flags: -DINSTR_PROF_CNTS=.lprfc$M
+//@ [WINDOWS] filecheck-flags: -DINSTR_PROF_COVMAP=.lcovmap$M
+//@ [WINDOWS] filecheck-flags: -DINSTR_PROF_COVFUN=.lcovfun$M
+//@ [WINDOWS] filecheck-flags: '-DCOMDAT_IF_SUPPORTED=, comdat'
+
+// ignore-tidy-linelength
+
+pub fn will_be_called() -> &'static str {
+    let val = "called";
+    println!("{}", val);
+    val
+}
+
+pub fn will_not_be_called() -> bool {
+    println!("should not have been called");
+    false
+}
+
+pub fn print<T>(left: &str, value: T, right: &str)
+where
+    T: std::fmt::Display,
+{
+    println!("{}{}{}", left, value, right);
+}
+
+pub fn wrap_with<F, T>(inner: T, should_wrap: bool, wrapper: F)
+where
+    F: FnOnce(&T)
+{
+    if should_wrap {
+        wrapper(&inner)
+    }
+}
+
+fn main() {
+    let less = 1;
+    let more = 100;
+
+    if less < more {
+        wrap_with(will_be_called(), less < more, |inner| print(" ***", inner, "*** "));
+        wrap_with(will_be_called(), more < less, |inner| print(" ***", inner, "*** "));
+    } else {
+        wrap_with(will_not_be_called(), true, |inner| print("wrapped result is: ", inner, ""));
+    }
+}
+
+// Check for metadata, variables, declarations, and function definitions injected
+// into LLVM IR when compiling with -Cinstrument-coverage.
+
+// WINDOWS:      $__llvm_profile_runtime_user = comdat any
+
+// CHECK:        @__llvm_coverage_mapping = private constant
+// CHECK-SAME:   section "[[INSTR_PROF_COVMAP]]", align 8
+
+// CHECK:        @__covrec_{{[A-F0-9]+}}u = linkonce_odr hidden constant
+// CHECK-SAME:   section "[[INSTR_PROF_COVFUN]]"[[COMDAT_IF_SUPPORTED]], align 8
+
+// WINDOWS:      @__llvm_profile_runtime = external{{.*}}global i32
+
+// CHECK:        @__profc__R{{[a-zA-Z0-9_]+}}testprog14will_be_called = {{private|internal}} global
+// CHECK-SAME:   section "[[INSTR_PROF_CNTS]]"{{.*}}, align 8
+
+// CHECK:        @__profd__R{{[a-zA-Z0-9_]+}}testprog14will_be_called = {{private|internal}} global
+// CHECK-SAME:   @__profc__R{{[a-zA-Z0-9_]+}}testprog14will_be_called
+// CHECK-SAME:   section "[[INSTR_PROF_DATA]]"{{.*}}, align 8
+
+// CHECK:        @__profc__R{{[a-zA-Z0-9_]+}}testprog4main = {{private|internal}} global
+// CHECK-SAME:   section "[[INSTR_PROF_CNTS]]"{{.*}}, align 8
+
+// CHECK:        @__profd__R{{[a-zA-Z0-9_]+}}testprog4main = {{private|internal}} global
+// CHECK-SAME:   @__profc__R{{[a-zA-Z0-9_]+}}testprog4main
+// CHECK-SAME:   section "[[INSTR_PROF_DATA]]"{{.*}}, align 8
+
+// CHECK:        @__llvm_prf_nm = private constant
+// CHECK-SAME:   section "[[INSTR_PROF_NAME]]", align 1
+
+// CHECK:        @llvm.used = appending global
+// CHECK-SAME:   @__llvm_coverage_mapping
+// CHECK-SAME:   @__llvm_prf_nm
+// CHECK-SAME:   section "llvm.metadata"
+
+// CHECK:        define internal { {{.*}} } @_R{{[a-zA-Z0-9_]+}}testprog14will_be_called() unnamed_addr #{{[0-9]+}} {
+// CHECK-NEXT:   start:
+// CHECK-NOT:    define internal
+// CHECK:        atomicrmw add ptr
+// CHECK-SAME:   @__profc__R{{[a-zA-Z0-9_]+}}testprog14will_be_called,
+
+// CHECK:        declare void @llvm.instrprof.increment(ptr, i64, i32, i32) #[[LLVM_INSTRPROF_INCREMENT_ATTR:[0-9]+]]
+
+// WINDOWS:      define linkonce_odr hidden i32 @__llvm_profile_runtime_user() #[[LLVM_PROFILE_RUNTIME_USER_ATTR:[0-9]+]] comdat {
+// WINDOWS-NEXT: %1 = load i32, ptr @__llvm_profile_runtime
+// WINDOWS-NEXT: ret i32 %1
+// WINDOWS-NEXT: }
+
+// CHECK:        attributes #[[LLVM_INSTRPROF_INCREMENT_ATTR]] = { nounwind }
+// WINDOWS:      attributes #[[LLVM_PROFILE_RUNTIME_USER_ATTR]] = { noinline }

tests/codegen/instrument-coverage.rs renamed to tests/codegen/instrument-coverage/instrument-coverage.rs

@@ -0,0 +1,4 @@
+// Simple test that uses the default CHECK prefix and should always succeed.
+
+// CHECK: main
+fn main() {}

tests/codegen/instrument-coverage/testprog.rs

@@ -0,0 +1,8 @@
+// Arguments provided via `filecheck-flags` should be passed to `filecheck`.
+
+//@ revisions: good bad
+//@ [good] filecheck-flags: --check-prefix=CUSTOM
+//@ [bad] should-fail
+
+// CUSTOM: main
+fn main() {}

tests/codegen/meta-filecheck/check-prefix.rs

@@ -0,0 +1,7 @@
+// This is exactly like `msvc-prefix-good.rs`, except that it should always fail.
+
+//@ should-fail
+
+// MSVC: text that should not match
+// NONMSVC: text that should not match
+fn main() {}

tests/codegen/meta-filecheck/filecheck-flags.rs

@@ -0,0 +1,7 @@
+// One of MSVC or NONMSVC should always be defined, so this test should pass.
+
+// (one of these should always be present)
+
+// MSVC: main
+// NONMSVC: main
+fn main() {}

tests/codegen/meta-filecheck/msvc-prefix-bad.rs

@@ -0,0 +1,5 @@
+// A test that doesn't include any filecheck directives should fail.
+
+//@ should-fail
+
+fn main() {}