[buck] java & clang combined capture

Summary:
A buck integration for capturing simultaneously clang and java targets.
Just like the java-specific `JavaGenruleCapture` integration, it relies on
dummy targets that depend on the flavoured clang versions.

For example, a `cxx_library` target named `//clang:hello` will have an associated target
called `//clang:hello_infer` that depends on `//clang:hello#infer-capture-all`,
and whose output is a text file containing the output path of the dependency.

Reviewed By: jvillard

Differential Revision: D21620458

fbshipit-source-id: 23919387b

infer/man/man1/infer-capture.txt

@@ -126,6 +126,10 @@ BUCK OPTIONS
            Activates: Buck integration for clang-based targets
            (C/C++/Objective-C/Objective-C++). (Conversely: --no-buck-clang)
 
+       --buck-combined
+           Activates: Buck integration for clang-based and Java targets.
+           (Conversely: --no-buck-combined)
+
        --buck-compilation-database { no-deps | deps }
            Buck integration using the compilation database, with or without
            dependencies. Only includes clang targets, as per Buck's

infer/man/man1/infer-full.txt

@@ -143,6 +143,10 @@ OPTIONS
            (C/C++/Objective-C/Objective-C++). (Conversely: --no-buck-clang)       
     See also infer-capture(1).
 
+       --buck-combined
+           Activates: Buck integration for clang-based and Java targets.
+           (Conversely: --no-buck-combined)           See also infer-capture(1).
+
        --buck-compilation-database { no-deps | deps }
            Buck integration using the compilation database, with or without
            dependencies. Only includes clang targets, as per Buck's

infer/man/man1/infer.txt

@@ -143,6 +143,10 @@ OPTIONS
            (C/C++/Objective-C/Objective-C++). (Conversely: --no-buck-clang)       
     See also infer-capture(1).
 
+       --buck-combined
+           Activates: Buck integration for clang-based and Java targets.
+           (Conversely: --no-buck-combined)           See also infer-capture(1).
+
        --buck-compilation-database { no-deps | deps }
            Buck integration using the compilation database, with or without
            dependencies. Only includes clang targets, as per Buck's

infer/src/base/BuckMode.ml

@@ -20,10 +20,14 @@ let pp_clang_compilation_db_deps fmt = function
       F.pp_print_string fmt "DepsAllDepths"
 
 
-type t = ClangFlavors | ClangCompilationDB of clang_compilation_db_deps | JavaGenruleMaster
+type t =
-
+  | CombinedGenrule
-let is_java_genrule_master = function
+  | ClangFlavors
-  | JavaGenruleMaster ->
+  | ClangCompilationDB of clang_compilation_db_deps
+  | JavaGenruleMaster
+
+let is_java_genrule_master_or_combined = function
+  | JavaGenruleMaster | CombinedGenrule ->
       true
   | ClangFlavors | ClangCompilationDB _ ->
       false
@@ -32,12 +36,12 @@ let is_java_genrule_master = function
 let is_clang_compilation_db = function
   | ClangCompilationDB _ ->
       true
-  | ClangFlavors | JavaGenruleMaster ->
+  | ClangFlavors | JavaGenruleMaster | CombinedGenrule ->
       false
 
 
 let is_clang_flavors = function
   | ClangFlavors ->
       true
-  | ClangCompilationDB _ | JavaGenruleMaster ->
+  | ClangCompilationDB _ | JavaGenruleMaster | CombinedGenrule ->
       false

infer/src/base/BuckMode.mli

@@ -13,9 +13,13 @@ type clang_compilation_db_deps = NoDependencies | DepsUpToDepth of int | DepsAll
 
 val pp_clang_compilation_db_deps : F.formatter -> clang_compilation_db_deps -> unit
 
-type t = ClangFlavors | ClangCompilationDB of clang_compilation_db_deps | JavaGenruleMaster
+type t =
+  | CombinedGenrule
+  | ClangFlavors
+  | ClangCompilationDB of clang_compilation_db_deps
+  | JavaGenruleMaster
 
-val is_java_genrule_master : t -> bool
+val is_java_genrule_master_or_combined : t -> bool
 
 val is_clang_compilation_db : t -> bool
 

infer/src/base/Config.ml

@@ -727,6 +727,11 @@ and buck_mode =
      clang targets, as per Buck's $(i,#compilation-database) flavor."
     ~symbols:[("no-deps", `NoDeps); ("deps", `DepsTmp)]
   |> ignore ;
+  CLOpt.mk_bool ~long:"buck-combined"
+    ~in_help:InferCommand.[(Capture, manual_buck)]
+    ~f:(set_mode `CombinedGenrule)
+    "Buck integration for clang-based and Java targets."
+  |> ignore ;
   buck_mode
 
 
@@ -2590,6 +2595,8 @@ and buck_mode : BuckMode.t option =
       Some (ClangCompilationDB DepsAllDepths)
   | `ClangCompilationDB `DepsTmp, Some depth ->
       Some (ClangCompilationDB (DepsUpToDepth depth))
+  | `CombinedGenrule, _ ->
+      Some CombinedGenrule
 
 
 and buck_targets_blacklist = !buck_targets_blacklist

infer/src/integration/Buck.ml

@@ -81,7 +81,7 @@ module Target = struct
     match (mode, command) with
     | ClangCompilationDB _, _ ->
         add_flavor_internal target "compilation-database"
-    | ClangFlavors, Compile | JavaGenruleMaster, _ ->
+    | ClangFlavors, Compile | JavaGenruleMaster, _ | CombinedGenrule, _ ->
         target
     | ClangFlavors, _ ->
         add_flavor_internal target "infer-capture-all"
@@ -191,12 +191,14 @@ let parameters_with_argument =
 
 let get_accepted_buck_kinds_pattern (mode : BuckMode.t) =
   match mode with
+  | CombinedGenrule ->
+      "^(android|apple|cxx|java)_(binary|library)$"
   | ClangCompilationDB _ ->
       "^(apple|cxx)_(binary|library|test)$"
-  | JavaGenruleMaster ->
-      "^(java|android)_library$"
   | ClangFlavors ->
       "^(apple|cxx)_(binary|library)$"
+  | JavaGenruleMaster ->
+      "^(java|android)_library$"
 
 
 let max_command_line_length = 50
@@ -209,15 +211,14 @@ let infer_enabled_label = "infer_enabled"
 (** for genrule_master_mode, this is the target name suffix for the capture genrules *)
 let genrule_suffix = "_infer"
 
-let config buck_mode =
+let config =
   let clang_path =
     List.fold ["clang"; "install"; "bin"; "clang"] ~init:Config.fcp_dir ~f:Filename.concat
   in
-  let args =
+  let get_java_genrule_config () =
-    match (buck_mode : BuckMode.t) with
-    | JavaGenruleMaster ->
     ["infer.version=" ^ Version.versionString; "infer.mode=capture"]
-    | ClangFlavors ->
+  in
+  let get_flavors_config () =
     [ "client.id=infer.clang"
     ; Printf.sprintf "*//infer.infer_bin=%s" Config.bin_dir
     ; Printf.sprintf "*//infer.clang_compiler=%s" clang_path
@@ -236,6 +237,16 @@ let config buck_mode =
     else
       [ Printf.sprintf "*//infer.blacklist_regex=(%s)"
           (String.concat ~sep:")|(" Config.buck_blacklist) ]
+  in
+  fun buck_mode ->
+    let args =
+      match (buck_mode : BuckMode.t) with
+      | JavaGenruleMaster ->
+          get_java_genrule_config ()
+      | ClangFlavors ->
+          get_flavors_config ()
+      | CombinedGenrule ->
+          get_java_genrule_config () @ get_flavors_config ()
       | ClangCompilationDB _ ->
           []
     in
@@ -247,17 +258,18 @@ let resolve_pattern_targets (buck_mode : BuckMode.t) ~filter_kind targets =
   |> ( match buck_mode with
      | ClangFlavors | ClangCompilationDB NoDependencies ->
          Fn.id
-     | JavaGenruleMaster | ClangCompilationDB DepsAllDepths ->
+     | CombinedGenrule | ClangCompilationDB DepsAllDepths | JavaGenruleMaster ->
          Query.deps None
      | ClangCompilationDB (DepsUpToDepth depth) ->
          Query.deps (Some depth) )
   |> (if filter_kind then Query.kind ~pattern:(get_accepted_buck_kinds_pattern buck_mode) else Fn.id)
-  |> ( if BuckMode.is_java_genrule_master buck_mode then
+  |> ( if BuckMode.is_java_genrule_master_or_combined buck_mode then
        Query.label_filter ~label:infer_enabled_label
      else Fn.id )
   |> Query.exec ~buck_config:(config buck_mode)
   |>
-  if BuckMode.is_java_genrule_master buck_mode then List.rev_map ~f:(fun s -> s ^ genrule_suffix)
+  if BuckMode.is_java_genrule_master_or_combined buck_mode then
+    List.rev_map ~f:(fun s -> s ^ genrule_suffix)
   else Fn.id
 
 
@@ -346,11 +358,12 @@ let parse_command_and_targets (buck_mode : BuckMode.t) ~filter_kind original_buc
   let targets =
     match (filter_kind, buck_mode, parsed_args) with
     | ( (`No | `Auto)
-      , (ClangFlavors | JavaGenruleMaster)
+      , (ClangFlavors | JavaGenruleMaster | CombinedGenrule)
       , {pattern_targets= []; alias_targets= []; normal_targets} ) ->
         normal_targets
-    | `No, (ClangFlavors | JavaGenruleMaster), {pattern_targets= []; alias_targets; normal_targets}
+    | ( `No
-      ->
+      , (ClangFlavors | JavaGenruleMaster | CombinedGenrule)
+      , {pattern_targets= []; alias_targets; normal_targets} ) ->
         alias_targets |> resolve_alias_targets |> List.rev_append normal_targets
     | (`Yes | `No | `Auto), _, {pattern_targets; alias_targets; normal_targets} ->
         let filter_kind = match filter_kind with `No -> false | `Yes | `Auto -> true in

infer/src/integration/BuckGenrule.ml

@@ -42,7 +42,7 @@ module L = Logging
 ]
 *)
 
-(** Read the build report json file buck produced, and parse into a sorted list of pairs
+(** Read the build report json file buck produced, and parse into a list of pairs
     [(target, output-path)]. NB contrary to what buck documentation says, the output path is always
     present even when the target is locally cached. *)
 let read_and_parse_report build_report =
@@ -78,9 +78,56 @@ let read_and_parse_report build_report =
     | _ ->
         None
   in
-  Yojson.Basic.from_file build_report
+  Yojson.Basic.from_file build_report |> get_json_field "results" |> Option.bind ~f:parse_results
-  |> get_json_field "results" |> Option.bind ~f:parse_results
+
-  |> Option.map ~f:(List.stable_sort ~compare:[%compare: string * string])
+
+(** Function for processing paths in a buck build report and generating an [infer-deps.txt] file.
+    Given a pair [(buck_target, output_path)],
+
+    - if [output_path] contains a capture DB, then generate the appropriate deps line;
+    - if [output_path] contains an [infer-deps.txt] file, expand and inline it;
+    - if [output_path] is a dummy target used in the combined genrule integration for clang targets,
+      read its contents, parse them as an output directory path and apply the above two tests to
+      that *)
+let expand_target acc (target, target_path) =
+  let expand_dir acc (target, target_path) =
+    (* invariant: [target_path] is absolute *)
+    let db_file = ResultsDirEntryName.get_path ~results_dir:target_path CaptureDB in
+    match Sys.file_exists db_file with
+    | `Yes ->
+        (* there is a capture DB at this path, so terminate expansion and generate deps line *)
+        let line = Printf.sprintf "%s\t-\t%s" target target_path in
+        line :: acc
+    | `No | `Unknown -> (
+        (* no capture DB was found, so look for, and inline, an [infer-deps.txt] file *)
+        let infer_deps = ResultsDirEntryName.get_path ~results_dir:target_path BuckDependencies in
+        match Sys.file_exists infer_deps with
+        | `Yes ->
+            Utils.with_file_in infer_deps
+              ~f:(In_channel.fold_lines ~init:acc ~f:(fun acc line -> line :: acc))
+        | `No | `Unknown ->
+            L.internal_error "No capture DB or infer-deps file in %s@." target_path ;
+            acc )
+  in
+  let target_path =
+    if Filename.is_absolute target_path then target_path else Config.project_root ^/ target_path
+  in
+  match Sys.is_directory target_path with
+  | `Yes ->
+      (* output path is directory, so should contain either a capture DB or an [infer-deps.txt] file *)
+      expand_dir acc (target, target_path)
+  | `No | `Unknown -> (
+    (* output path is not a directory, so assume it's an intermediate genrule output containing the
+       output path of the underlying capture target *)
+    match Utils.read_file target_path with
+    | Ok [new_target_path] ->
+        expand_dir acc (target, new_target_path)
+    | Ok _ ->
+        L.internal_error "Couldn't parse intermediate deps file %s@." target_path ;
+        acc
+    | Error error ->
+        L.internal_error "Error %s@\nCouldn't read intermediate deps file %s@." error target_path ;
+        acc )
 
 
 let infer_deps_of_build_report build_report =
@@ -88,12 +135,13 @@ let infer_deps_of_build_report build_report =
   | None ->
       L.die InternalError "Couldn't parse buck build report: %s@." build_report
   | Some target_path_list ->
-      let out_line out_channel (target, target_output_path) =
+      let infer_deps_lines =
-        Printf.fprintf out_channel "%s\t-\t%s\n" target (Config.project_root ^/ target_output_path)
+        List.fold target_path_list ~init:[] ~f:expand_target
+        |> List.dedup_and_sort ~compare:String.compare
       in
       let infer_deps = ResultsDir.get_path BuckDependencies in
       Utils.with_file_out infer_deps ~f:(fun out_channel ->
-          List.iter target_path_list ~f:(out_line out_channel) )
+          Out_channel.output_lines out_channel infer_deps_lines )
 
 
 let run_buck_capture cmd =
@@ -106,12 +154,12 @@ let run_buck_capture cmd =
   Buck.wrap_buck_call ~extend_env ~label:"build" cmd |> ignore
 
 
-let capture build_cmd =
+let capture buck_mode build_cmd =
   let prog, buck_cmd = (List.hd_exn build_cmd, List.tl_exn build_cmd) in
   L.progress "Querying buck for genrule capture targets...@." ;
   let time0 = Mtime_clock.counter () in
   let command, args, targets =
-    Buck.parse_command_and_targets JavaGenruleMaster ~filter_kind:`Yes buck_cmd
+    Buck.parse_command_and_targets buck_mode ~filter_kind:`Yes buck_cmd
   in
   L.progress "Found %d genrule capture targets in %a.@." (List.length targets) Mtime.Span.pp
     (Mtime_clock.count time0) ;
@@ -121,7 +169,7 @@ let capture build_cmd =
   in
   let updated_buck_cmd =
     (* make buck tell us where in buck-out are the capture directories for merging *)
-    (prog :: command :: "--build-report" :: build_report_file :: Buck.config JavaGenruleMaster)
+    (prog :: command :: "--build-report" :: build_report_file :: Buck.config buck_mode)
     @ List.rev_append Config.buck_build_args_no_inline (Buck.store_args_in_file all_args)
   in
   L.(debug Capture Quiet)

infer/src/integration/BuckGenrule.mli

@@ -7,5 +7,5 @@
 
 open! IStd
 
-val capture : string list -> unit
+val capture : BuckMode.t -> string list -> unit
 (** do genrule capture with the given buck command line *)

infer/src/integration/Driver.ml

@@ -18,6 +18,7 @@ type mode =
   | Analyze
   | Ant of {prog: string; args: string list}
   | BuckClangFlavor of {build_cmd: string list}
+  | BuckCombinedGenrule of {build_cmd: string list}
   | BuckCompilationDB of {deps: BuckMode.clang_compilation_db_deps; prog: string; args: string list}
   | BuckGenrule of {prog: string}
   | BuckGenruleMaster of {build_cmd: string list}
@@ -39,6 +40,8 @@ let pp_mode fmt = function
       F.fprintf fmt "Ant driver mode:@\nprog = '%s'@\nargs = %a" prog Pp.cli_args args
   | BuckClangFlavor {build_cmd} ->
       F.fprintf fmt "BuckClangFlavor driver mode: build_cmd = %a" Pp.cli_args build_cmd
+  | BuckCombinedGenrule {build_cmd} ->
+      F.fprintf fmt "BuckCombinedGenrule driver mode: build_cmd = %a" Pp.cli_args build_cmd
   | BuckCompilationDB {deps; prog; args} ->
       F.fprintf fmt "BuckCompilationDB driver mode:@\nprog = '%s'@\nargs = %a@\ndeps = %a" prog
         Pp.cli_args args BuckMode.pp_clang_compilation_db_deps deps
@@ -119,6 +122,9 @@ let capture ~changed_files = function
   | BuckClangFlavor {build_cmd} ->
       L.progress "Capturing in buck mode...@." ;
       BuckFlavors.capture build_cmd
+  | BuckCombinedGenrule {build_cmd} ->
+      L.progress "Capturing in buck combined genrule mode...@." ;
+      BuckGenrule.capture CombinedGenrule build_cmd
   | BuckCompilationDB {deps; prog; args} ->
       L.progress "Capturing using Buck's compilation database...@." ;
       let json_cdb =
@@ -130,7 +136,7 @@ let capture ~changed_files = function
       JMain.from_arguments prog
   | BuckGenruleMaster {build_cmd} ->
       L.progress "Capturing for BuckGenruleMaster integration...@." ;
-      BuckGenrule.capture build_cmd
+      BuckGenrule.capture JavaGenruleMaster build_cmd
   | Clang {compiler; prog; args} ->
       if CLOpt.is_originator then L.progress "Capturing in make/cc mode...@." ;
       Clang.capture compiler ~prog ~args
@@ -246,7 +252,7 @@ let analyze_and_report ?suppress_console_report ~changed_files mode =
            && InferCommand.equal Run Config.command ->
         (* if doing capture + analysis of buck with flavors, we always need to merge targets before the analysis phase *)
         true
-    | Analyze | BuckGenruleMaster _ ->
+    | Analyze | BuckGenruleMaster _ | BuckCombinedGenrule _ ->
         ResultsDir.RunState.get_merge_capture ()
     | _ ->
         false
@@ -285,6 +291,8 @@ let assert_supported_mode required_analyzer requested_mode_string =
     match required_analyzer with
     | `Clang ->
         Version.clang_enabled
+    | `ClangJava ->
+        Version.clang_enabled && Version.java_enabled
     | `Java ->
         Version.java_enabled
     | `Xcode ->
@@ -295,6 +303,8 @@ let assert_supported_mode required_analyzer requested_mode_string =
       match required_analyzer with
       | `Clang ->
           "clang"
+      | `ClangJava ->
+          "clang & java"
       | `Java ->
           "java"
       | `Xcode ->
@@ -326,6 +336,8 @@ let assert_supported_build_system build_system =
         match Config.buck_mode with
         | None ->
             error_no_buck_mode_specified ()
+        | Some CombinedGenrule ->
+            (`ClangJava, "buck combined genrule")
         | Some ClangFlavors ->
             (`Clang, "buck with flavors")
         | Some (ClangCompilationDB _) ->
@@ -357,6 +369,8 @@ let mode_of_build_command build_cmd (buck_mode : BuckMode.t option) =
           Ant {prog; args}
       | BBuck, None ->
           error_no_buck_mode_specified ()
+      | BBuck, Some CombinedGenrule ->
+          BuckCombinedGenrule {build_cmd}
       | BBuck, Some (ClangCompilationDB deps) ->
           BuckCompilationDB {deps; prog; args= List.append args (List.rev Config.buck_build_args)}
       | BBuck, Some ClangFlavors when Config.is_checker_enabled Linters ->

infer/src/integration/Driver.mli

@@ -15,6 +15,7 @@ type mode =
   | Analyze
   | Ant of {prog: string; args: string list}
   | BuckClangFlavor of {build_cmd: string list}
+  | BuckCombinedGenrule of {build_cmd: string list}
   | BuckCompilationDB of {deps: BuckMode.clang_compilation_db_deps; prog: string; args: string list}
   | BuckGenrule of {prog: string}
   | BuckGenruleMaster of {build_cmd: string list}

infer/tests/build_systems/buck_combined/.buckconfig

@@ -0,0 +1,2 @@
+[buildfile]
+  includes = //DEFS

infer/tests/build_systems/buck_combined/.buckversion

@@ -0,0 +1 @@
+../../../../.buckversion

infer/tests/build_systems/buck_combined/DEFS

@@ -0,0 +1,91 @@
+import os
+
+original_cxx_library = cxx_library
+original_java_library = java_library
+
+infer_clang_flavor = "infer-capture-all"
+
+def _cxx_infer_capture_genrule(name):
+  cmd = "echo $(location :{}#{}) > $OUT".format(name, infer_clang_flavor)
+
+  genrule(
+      name = name + "_infer",
+      out = "dummy_out",
+      cmd = cmd,
+  )
+
+def cxx_library(name, **kwargs):
+  _cxx_infer_capture_genrule(name)
+  new_kwargs = dict(kwargs, labels=kwargs.get("labels", []) + ["infer_enabled"])
+
+  original_cxx_library(
+    name=name,
+    **new_kwargs
+  )
+
+
+def _get_project_root():
+  return "\$(git rev-parse --show-toplevel)/infer/tests/build_systems/buck_combined"
+
+def _infer_capture_genrule(
+    name,
+    srcs
+  ):
+
+  args = [
+      "--jobs",
+      "1",
+      "--genrule-mode",
+      "--quiet",
+      "--no-progress-bar",
+      "--results-dir",
+      "$OUT",
+      "--sourcepath",
+      "$SRCDIR",
+      "--project-root",
+      _get_project_root(),
+      "--classpath",
+      "$(classpath :{})".format(name),
+      "--generated-classes",
+      "$(location :{})".format(name),
+      "capture",
+  ]
+
+  args_file = os.path.join("$TMP", "args.txt")
+  subcommands = [
+    "echo {} >> {}".format(arg, args_file)
+    for arg in args
+  ] + [
+    "infer @" + args_file
+  ]
+
+  genrule(
+      name = name + "_infer",
+      srcs = srcs,
+      cmd = " && ".join(subcommands),
+      out = "infer_out",
+      labels = ["infer_genrule"],
+  )
+
+
+def _make_infer_capture_genrule(name, kwargs):
+  java_sources = [
+    f
+    for f in kwargs.get("srcs", [])
+    if f.endswith(".java")
+  ]
+
+  if java_sources != []:
+    _infer_capture_genrule(name, java_sources)
+    kwargs["labels"] = kwargs.get("labels", []) + ["infer_enabled"]
+
+  return kwargs
+
+
+def java_library(name, **kwargs):
+  new_kwargs = _make_infer_capture_genrule(name, kwargs)
+
+  original_java_library(
+    name=name,
+    **new_kwargs
+  )

infer/tests/build_systems/buck_combined/Makefile

@@ -0,0 +1,26 @@
+# Copyright (c) Facebook, Inc. and its affiliates.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+TESTS_DIR = ../..
+ROOT_DIR = $(TESTS_DIR)/../..
+
+BUCK_TARGET = //clang:hello //java:hello
+SOURCES = clang/hello.c clang/hello2.c
+OBJECTS = buck-out/gen/clang/hello\#compile-hello.c.o1f717d69,default/hello.c.o
+INFER_OPTIONS = --report-custom-error --developer-mode --no-linters --buck-combined
+INFERPRINT_OPTIONS = --issues-tests
+CLEAN_EXTRA = buck-out
+
+include $(TESTS_DIR)/infer.make
+
+$(OBJECTS): $(SOURCES)
+	$(QUIET)$(call silent_on_success,Compiling Buck flavors tests,\
+	$(BUCK) build --no-cache $(BUCK_TARGET))
+
+infer-out/report.json: $(CLANG_DEPS) $(SOURCES) $(MAKEFILE_LIST)
+	$(QUIET)$(REMOVE_DIR) buck-out && \
+	$(call silent_on_success,Testing infer-run Buck combined genrule integration,\
+	$(INFER_BIN) $(INFER_OPTIONS) run --results-dir $(CURDIR)/infer-out -- \
+	  $(BUCK) build --no-cache $(BUCK_TARGET))

infer/tests/build_systems/buck_combined/clang/BUCK

@@ -0,0 +1,6 @@
+cxx_library(
+  name = 'hello',
+  srcs = [
+    'hello.c', 'hello2.c',
+  ],
+)

infer/tests/build_systems/buck_combined/clang/hello.c

@@ -0,0 +1,13 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#include <stdlib.h>
+
+void test() {
+  int* s = NULL;
+  *s = 42;
+}

infer/tests/build_systems/buck_combined/clang/hello2.c

@@ -0,0 +1,13 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#include <stdlib.h>
+
+void test2() {
+  int* s = NULL;
+  *s = 42;
+}

infer/tests/build_systems/buck_combined/issues.exp

@@ -0,0 +1,3 @@
+clang/hello.c, test, 2, NULL_DEREFERENCE, no_bucket, ERROR, [start of procedure test()]
+clang/hello2.c, test2, 2, NULL_DEREFERENCE, no_bucket, ERROR, [start of procedure test2()]
+java/NullDeref.java, NullDeref.callToStringWithNullBad():java.lang.String, 1, NULL_DEREFERENCE, no_bucket, ERROR, [start of procedure callToStringWithNullBad(),start of procedure myToString(...),Skipping toString(): unknown method]

infer/tests/build_systems/buck_combined/java/BUCK

@@ -0,0 +1,6 @@
+java_library(
+  name='hello',
+  srcs=glob(["*.java"]),
+  deps=[],
+  visibility=['PUBLIC'],
+)

infer/tests/build_systems/buck_combined/java/NullDeref.java

@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+public class NullDeref {
+  private static String myToString(Object foo) {
+    return foo.toString();
+  }
+
+  public String callToStringWithNullBad() {
+    return myToString(null);
+  }
+}