[infer][genrule] Add example of Buck DEFS macro to generate Infer analysis targets

Summary: Adding Buck `DEFS` macros for generating Infer genrules. The generated genrules can be used to run the analysis on any existing `java_library` targets.

Reviewed By: sblackshear

Differential Revision: D4291234

fbshipit-source-id: 6430e2e

Author: jeremydubreil

.buckconfig

@@ -1,3 +1,5 @@
+[buildfile]
+  includes = //DEFS
 
 [project]
   ignore = .git, .ml, .mli

DEFS

@@ -0,0 +1,47 @@
+import os
+
+original_java_library = java_library
+def java_library(
+    name,
+    deps=[],
+    **kwargs
+    ):
+  compile_name = name + '_compile'
+  top_deps = []
+
+  if 'GENERATE_INFER_GENRULES' in os.environ:
+    export_srcs_name = name + '_export_srcs'
+    genrule(
+      name = export_srcs_name,
+      srcs = kwargs.get('srcs', []),
+      cmd = 'mkdir -p $OUT && cp -R $SRCDIR/* $OUT/',
+      out = 'src_copy',
+    )
+    infer_name = name + '_infer'
+    genrule(
+      name = infer_name,
+      cmd = ' '.join([
+        os.getenv('INFER_BIN', 'infer'),
+        '--results-dir', '$OUT',
+        '--classpath', '$(classpath :{})'.format(compile_name),
+        '--sourcepath', '$(location :{})'.format(export_srcs_name),
+        '--generated-classes', '$(location :{})'.format(compile_name),
+        '--', 'genrule'
+      ]),
+      out = 'infer_out',
+    )
+    top_deps += [':' + infer_name, ':' + export_srcs_name]
+
+  original_java_library(
+    name=name,
+    exported_deps=[
+      ':' + compile_name,
+    ],
+    deps=top_deps,
+    visibility = kwargs.get('visibility', [])
+  )
+  original_java_library(
+    name=compile_name,
+    deps=deps,
+    **kwargs
+  )

infer/tests/build_systems/buck/Makefile

@@ -24,7 +24,7 @@ $(JAR_OUTPUT): $(JAVA_SOURCE_FILES)
 
 .PHONY: genrule
 genrule: $(JAR_OUTPUT)
-	cd $(ROOT_DIR) && $(call silent_on_success, INFER_BIN=$(INFER_BIN) NO_BUCKD=1 buck build --no-cache //infer/tests/codetoanalyze/java/infer:run_infer)
+	cd $(ROOT_DIR) && $(call silent_on_success, INFER_BIN=$(INFER_BIN) NO_BUCKD=1 GENERATE_INFER_GENRULES=1 buck build --no-cache //infer/tests/build_systems/genrule/module2:module2_infer)
 
 infer-out/report.json: genrule $(INFER_BIN) $(JAVA_SOURCE_FILES)
 	cd $(ROOT_DIR) && $(call silent_on_success, INFER_BIN=$(INFER_BIN) NO_BUCKD=1 $(INFER_BIN) -a $(ANALYZER) --results-dir $(CURDIR)/infer-out  -- buck build --no-cache //infer/tests/codetoanalyze/java/infer:compile)

infer/tests/build_systems/genrule/annotations/BUCK

@@ -0,0 +1,7 @@
+java_library(
+    name='annotations',
+    srcs=['Nullable.java'],
+    visibility=[
+        'PUBLIC'
+    ],
+)

infer/tests/build_systems/genrule/annotations/Nullable.java

@@ -0,0 +1,4 @@
+package genrule.annotations;
+
+public @interface Nullable {
+}

infer/tests/build_systems/genrule/module1/BUCK

@@ -0,0 +1,10 @@
+java_library(
+    name='module1',
+    srcs=['Class1.java'],
+    deps=[
+        '//infer/tests/build_systems/genrule/annotations:annotations',
+    ],
+    visibility=[
+        'PUBLIC'
+    ],
+)

infer/tests/build_systems/genrule/module1/Class1.java

@@ -0,0 +1,17 @@
+package genrule.module1;
+
+import genrule.annotations.Nullable;
+
+public class Class1 {
+
+  @Nullable
+  public static String returnsNull() {
+    return null;
+  }
+
+  void localNPE1() {
+    Object obj = null;
+    obj.toString();
+  }
+
+}

infer/tests/build_systems/genrule/module2/BUCK

@@ -0,0 +1,7 @@
+java_library(
+    name='module2',
+    srcs=['Class2.java'],
+    deps=[
+        '//infer/tests/build_systems/genrule/module1:module1'
+    ]
+)

infer/tests/build_systems/genrule/module2/Class2.java

@@ -0,0 +1,17 @@
+package genrule.module2;
+
+import genrule.module1.Class1;
+
+public class Class2 {
+
+  void interTargetNPE() {
+    Object obj = Class1.returnsNull();
+    obj.toString();
+  }
+
+  void localNPE2() {
+    Object obj = null;
+    obj.toString();
+  }
+
+}

infer/tests/codetoanalyze/java/infer/BUCK

@@ -2,11 +2,9 @@
 
 import os
 
-sources = glob(['**/*.java'])
-
 java_library(
     name = 'compile',
-    srcs = sources,
+    srcs = glob(['**/*.java']),
     deps = [
         '//dependencies/java/guava:guava',
         '//dependencies/java/jsr-305:jsr-305',
@@ -19,21 +17,3 @@ java_library(
         'PUBLIC'
     ]
 )
-
-genrule(
-    name = 'run_infer',
-    srcs = sources,
-    out = 'infer-out',
-    bash = ' '.join([
-        os.getenv('INFER_BIN', 'infer'),
-        '--sourcepath',
-        '$SRCDIR',
-        '--classpath',
-        '$(classpath :compile)',
-        '--generated-classes',
-        '$(location :compile)',
-        '--out',
-        '$OUT',
-        '--',
-        'genrule']),
-)