Merge pull request #957 from iovisor/misc_fixes

Fixes for LLVM4+, python3

src/cc/export/helpers.h

@@ -147,7 +147,7 @@ static u32 (*bpf_get_prandom_u32)(void) =
 static int (*bpf_trace_printk_)(const char *fmt, u64 fmt_size, ...) =
   (void *) BPF_FUNC_trace_printk;
 int bpf_trace_printk(const char *fmt, ...) asm("llvm.bpf.extra");
-static void bpf_tail_call_(u64 map_fd, void *ctx, int index) {
+static inline void bpf_tail_call_(u64 map_fd, void *ctx, int index) {
   ((void (*)(void *, u64, int))BPF_FUNC_tail_call)(ctx, map_fd, index);
 }
 static int (*bpf_clone_redirect)(void *ctx, int ifindex, u32 flags) =

src/cc/frontends/b/codegen_llvm.cc

@@ -1163,6 +1163,8 @@ StatusTuple CodegenLLVM::visit_func_decl_stmt_node(FuncDeclStmtNode *n) {
   Function *fn = mod_->getFunction(n->id_->name_);
   if (fn) return mkstatus_(n, "Function %s already defined", n->id_->c_str());
   fn = Function::Create(fn_type, GlobalValue::ExternalLinkage, n->id_->name_, mod_);
+  fn->setCallingConv(CallingConv::C);
+  fn->addFnAttr(Attribute::NoUnwind);
   fn->setSection(BPF_FN_PREFIX + n->id_->name_);
 
   BasicBlock *label_entry = BasicBlock::Create(ctx(), "entry", fn);

src/cc/frontends/clang/loader.cc

@@ -211,24 +211,25 @@ int ClangLoader::parse(unique_ptr<llvm::Module> *mod, unique_ptr<vector<TableDes
   }
 
   // pre-compilation pass for generating tracepoint structures
-  auto invocation0 = make_unique<CompilerInvocation>();
-  if (!CompilerInvocation::CreateFromArgs(*invocation0, const_cast<const char **>(ccargs.data()),
+  CompilerInstance compiler0;
+  CompilerInvocation &invocation0 = compiler0.getInvocation();
+  if (!CompilerInvocation::CreateFromArgs(
+          invocation0, const_cast<const char **>(ccargs.data()),
           const_cast<const char **>(ccargs.data()) + ccargs.size(), diags))
     return -1;
 
-  invocation0->getPreprocessorOpts().RetainRemappedFileBuffers = true;
+  invocation0.getPreprocessorOpts().RetainRemappedFileBuffers = true;
   for (const auto &f : remapped_files_)
-    invocation0->getPreprocessorOpts().addRemappedFile(f.first, &*f.second);
+    invocation0.getPreprocessorOpts().addRemappedFile(f.first, &*f.second);
 
   if (in_memory) {
-    invocation0->getPreprocessorOpts().addRemappedFile(main_path, &*main_buf);
-    invocation0->getFrontendOpts().Inputs.clear();
-    invocation0->getFrontendOpts().Inputs.push_back(FrontendInputFile(main_path, IK_C));
+    invocation0.getPreprocessorOpts().addRemappedFile(main_path, &*main_buf);
+    invocation0.getFrontendOpts().Inputs.clear();
+    invocation0.getFrontendOpts().Inputs.push_back(
+        FrontendInputFile(main_path, IK_C));
   }
-  invocation0->getFrontendOpts().DisableFree = false;
+  invocation0.getFrontendOpts().DisableFree = false;
 
-  CompilerInstance compiler0;
-  compiler0.setInvocation(invocation0.release());
   compiler0.createDiagnostics(new IgnoringDiagConsumer());
 
   // capture the rewritten c file
@@ -239,24 +240,25 @@ int ClangLoader::parse(unique_ptr<llvm::Module> *mod, unique_ptr<vector<TableDes
   unique_ptr<llvm::MemoryBuffer> out_buf = llvm::MemoryBuffer::getMemBuffer(out_str);
 
   // first pass
-  auto invocation1 = make_unique<CompilerInvocation>();
-  if (!CompilerInvocation::CreateFromArgs(*invocation1, const_cast<const char **>(ccargs.data()),
+  CompilerInstance compiler1;
+  CompilerInvocation &invocation1 = compiler1.getInvocation();
+  if (!CompilerInvocation::CreateFromArgs(
+          invocation1, const_cast<const char **>(ccargs.data()),
           const_cast<const char **>(ccargs.data()) + ccargs.size(), diags))
     return -1;
 
   // This option instructs clang whether or not to free the file buffers that we
   // give to it. Since the embedded header files should be copied fewer times
   // and reused if possible, set this flag to true.
-  invocation1->getPreprocessorOpts().RetainRemappedFileBuffers = true;
+  invocation1.getPreprocessorOpts().RetainRemappedFileBuffers = true;
   for (const auto &f : remapped_files_)
-    invocation1->getPreprocessorOpts().addRemappedFile(f.first, &*f.second);
-  invocation1->getPreprocessorOpts().addRemappedFile(main_path, &*out_buf);
-  invocation1->getFrontendOpts().Inputs.clear();
-  invocation1->getFrontendOpts().Inputs.push_back(FrontendInputFile(main_path, IK_C));
-  invocation1->getFrontendOpts().DisableFree = false;
+    invocation1.getPreprocessorOpts().addRemappedFile(f.first, &*f.second);
+  invocation1.getPreprocessorOpts().addRemappedFile(main_path, &*out_buf);
+  invocation1.getFrontendOpts().Inputs.clear();
+  invocation1.getFrontendOpts().Inputs.push_back(
+      FrontendInputFile(main_path, IK_C));
+  invocation1.getFrontendOpts().DisableFree = false;
 
-  CompilerInstance compiler1;
-  compiler1.setInvocation(invocation1.release());
   compiler1.createDiagnostics();
 
   // capture the rewritten c file
@@ -270,21 +272,22 @@ int ClangLoader::parse(unique_ptr<llvm::Module> *mod, unique_ptr<vector<TableDes
   *tables = bact.take_tables();
 
   // second pass, clear input and take rewrite buffer
-  auto invocation2 = make_unique<CompilerInvocation>();
-  if (!CompilerInvocation::CreateFromArgs(*invocation2, const_cast<const char **>(ccargs.data()),
+  CompilerInstance compiler2;
+  CompilerInvocation &invocation2 = compiler2.getInvocation();
+  if (!CompilerInvocation::CreateFromArgs(
+          invocation2, const_cast<const char **>(ccargs.data()),
           const_cast<const char **>(ccargs.data()) + ccargs.size(), diags))
     return -1;
-  CompilerInstance compiler2;
-  invocation2->getPreprocessorOpts().RetainRemappedFileBuffers = true;
+  invocation2.getPreprocessorOpts().RetainRemappedFileBuffers = true;
   for (const auto &f : remapped_files_)
-    invocation2->getPreprocessorOpts().addRemappedFile(f.first, &*f.second);
-  invocation2->getPreprocessorOpts().addRemappedFile(main_path, &*out_buf1);
-  invocation2->getFrontendOpts().Inputs.clear();
-  invocation2->getFrontendOpts().Inputs.push_back(FrontendInputFile(main_path, IK_C));
-  invocation2->getFrontendOpts().DisableFree = false;
+    invocation2.getPreprocessorOpts().addRemappedFile(f.first, &*f.second);
+  invocation2.getPreprocessorOpts().addRemappedFile(main_path, &*out_buf1);
+  invocation2.getFrontendOpts().Inputs.clear();
+  invocation2.getFrontendOpts().Inputs.push_back(
+      FrontendInputFile(main_path, IK_C));
+  invocation2.getFrontendOpts().DisableFree = false;
   // suppress warnings in the 2nd pass, but bail out on errors (our fault)
-  invocation2->getDiagnosticOpts().IgnoreWarnings = true;
-  compiler2.setInvocation(invocation2.release());
+  invocation2.getDiagnosticOpts().IgnoreWarnings = true;
   compiler2.createDiagnostics();
 
   EmitLLVMOnlyAction ir_act(&*ctx_);

src/python/bcc/__init__.py

@@ -764,7 +764,7 @@ class BPF(object):
         fn = self.load_func(fn_name, BPF.KPROBE)
         ev_name = "p_%s_0x%x" % (self._probe_repl.sub("_", path), addr)
         res = lib.bpf_attach_uprobe(fn.fd, 0, ev_name.encode("ascii"),
-                path, addr, pid, cpu, group_fd,
+                path.encode("ascii"), addr, pid, cpu, group_fd,
                 self._reader_cb_impl, ct.cast(id(self), ct.py_object))
         res = ct.cast(res, ct.c_void_p)
         if not res:
@@ -814,7 +814,7 @@ class BPF(object):
         fn = self.load_func(fn_name, BPF.KPROBE)
         ev_name = "r_%s_0x%x" % (self._probe_repl.sub("_", path), addr)
         res = lib.bpf_attach_uprobe(fn.fd, 1, ev_name.encode("ascii"),
-                path, addr, pid, cpu, group_fd,
+                path.encode("ascii"), addr, pid, cpu, group_fd,
                 self._reader_cb_impl, ct.cast(id(self), ct.py_object))
         res = ct.cast(res, ct.c_void_p)
         if not res:
@@ -1046,7 +1046,8 @@ class BPF(object):
         for k, v in self.open_tracepoints.items():
             lib.perf_reader_free(v)
             (tp_category, tp_name) = k.split(':')
-            lib.bpf_detach_tracepoint(tp_category, tp_name)
+            lib.bpf_detach_tracepoint(tp_category.encode("ascii"),
+                    tp_name.encode("ascii"))
         self.open_tracepoints.clear()
         for (ev_type, ev_config) in list(self.open_perf_events.keys()):
             self.detach_perf_event(ev_type, ev_config)

tests/python/CMakeLists.txt

@@ -17,7 +17,7 @@ endif()
 add_test(NAME py_test_stat1_b WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
   COMMAND ${TEST_WRAPPER} py_stat1_b namespace ${CMAKE_CURRENT_SOURCE_DIR}/test_stat1.py test_stat1.b proto.b)
 add_test(NAME py_test_bpf_log WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
-  COMMAND ${TEST_WRAPPER} py_bpf_prog namespace ${CMAKE_CURRENT_SOURCE_DIR}/test_bpf_log.py)
+  COMMAND ${TEST_WRAPPER} py_bpf_prog sudo ${CMAKE_CURRENT_SOURCE_DIR}/test_bpf_log.py)
 add_test(NAME py_test_stat1_c WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
   COMMAND ${TEST_WRAPPER} py_stat1_c namespace ${CMAKE_CURRENT_SOURCE_DIR}/test_stat1.py test_stat1.c)
 #add_test(NAME py_test_xlate1_b WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}

tests/python/test_bpf_log.py

@@ -51,7 +51,7 @@ class TestBPFProgLoad(TestCase):
         except Exception:
             self.fp.flush()
             self.fp.seek(0)
-            self.assertEqual(error_msg in self.fp.read(), True)
+            self.assertEqual(error_msg in self.fp.read().decode(), True)
 
 
     def test_log_no_debug(self):
@@ -61,7 +61,7 @@ class TestBPFProgLoad(TestCase):
         except Exception:
             self.fp.flush()
             self.fp.seek(0)
-            self.assertEqual(error_msg in self.fp.read(), True)
+            self.assertEqual(error_msg in self.fp.read().decode(), True)
 
 
 if __name__ == "__main__":

tests/python/test_tracepoint.py

@@ -61,10 +61,8 @@ class TestTracepointDataLoc(unittest.TestCase):
         b = bcc.BPF(text=text)
         subprocess.check_output(["/bin/ls"])
         sleep(1)
-        found = False
-        for k, v in b["execs"].items():
-            found = "ls" in v.filename
-        self.assertTrue(found, "'ls' was not found in map")
+        self.assertTrue("/bin/ls" in [v.filename.decode()
+                                      for v in b["execs"].values()])
 
 if __name__ == "__main__":
     unittest.main()