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Subject[PATCH v2 06/18] perf clang: Add builtin clang support ant test case
Date
Add basic clang support in clang.cpp and test__clang() testcase.
The first testcase checks if builtin clang is able to generate LLVM IR.

tests/clang.c is a proxy. Real testcase resides in utils/c++/clang-test.cpp
in c++ and exports C interface to perf test subsystem.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexei Starovoitov <ast@fb.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
---
tools/perf/tests/Build | 1 +
tools/perf/tests/builtin-test.c | 9 ++++
tools/perf/tests/clang.c | 42 +++++++++++++++++
tools/perf/tests/tests.h | 3 ++
tools/perf/util/Build | 2 +
tools/perf/util/c++/Build | 2 +
tools/perf/util/c++/clang-c.h | 16 +++++++
tools/perf/util/c++/clang-test.cpp | 31 ++++++++++++
tools/perf/util/c++/clang.cpp | 96 ++++++++++++++++++++++++++++++++++++++
tools/perf/util/c++/clang.h | 16 +++++++
10 files changed, 218 insertions(+)
create mode 100644 tools/perf/tests/clang.c
create mode 100644 tools/perf/util/c++/Build
create mode 100644 tools/perf/util/c++/clang-c.h
create mode 100644 tools/perf/util/c++/clang-test.cpp
create mode 100644 tools/perf/util/c++/clang.cpp
create mode 100644 tools/perf/util/c++/clang.h

diff --git a/tools/perf/tests/Build b/tools/perf/tests/Build
index dc51bc5..6a20004 100644
--- a/tools/perf/tests/Build
+++ b/tools/perf/tests/Build
@@ -42,6 +42,7 @@ perf-y += backward-ring-buffer.o
perf-y += sdt.o
perf-y += is_printable_array.o
perf-y += bitmap.o
+perf-y += clang.o

$(OUTPUT)tests/llvm-src-base.c: tests/bpf-script-example.c tests/Build
$(call rule_mkdir)
diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
index 778668a..b9b6053 100644
--- a/tools/perf/tests/builtin-test.c
+++ b/tools/perf/tests/builtin-test.c
@@ -230,6 +230,15 @@ static struct test generic_tests[] = {
.func = test__bitmap_print,
},
{
+ .desc = "Test builtin clang support",
+ .func = test__clang,
+ .subtest = {
+ .skip_if_fail = true,
+ .get_nr = test__clang_subtest_get_nr,
+ .get_desc = test__clang_subtest_get_desc,
+ }
+ },
+ {
.func = NULL,
},
};
diff --git a/tools/perf/tests/clang.c b/tools/perf/tests/clang.c
new file mode 100644
index 0000000..57ee160
--- /dev/null
+++ b/tools/perf/tests/clang.c
@@ -0,0 +1,42 @@
+#include "tests.h"
+#include "debug.h"
+#include "util.h"
+#include "c++/clang-c.h"
+
+static struct {
+ int (*func)(void);
+ const char *desc;
+} clang_testcase_table[] = {
+#ifdef HAVE_LIBCLANGLLVM_SUPPORT
+ {
+ .func = test__clang_to_IR,
+ .desc = "Test builtin clang compile C source to IR",
+ },
+#endif
+};
+
+int test__clang_subtest_get_nr(void)
+{
+ return (int)ARRAY_SIZE(clang_testcase_table);
+}
+
+const char *test__clang_subtest_get_desc(int i)
+{
+ if (i < 0 || i >= (int)ARRAY_SIZE(clang_testcase_table))
+ return NULL;
+ return clang_testcase_table[i].desc;
+}
+
+#ifndef HAVE_LIBCLANGLLVM_SUPPORT
+int test__clang(int i __maybe_unused)
+{
+ return TEST_SKIP;
+}
+#else
+int test__clang(int i __maybe_unused)
+{
+ if (i < 0 || i >= (int)ARRAY_SIZE(clang_testcase_table))
+ return TEST_FAIL;
+ return clang_testcase_table[i].func();
+}
+#endif
diff --git a/tools/perf/tests/tests.h b/tools/perf/tests/tests.h
index 7c196c5..39a4887 100644
--- a/tools/perf/tests/tests.h
+++ b/tools/perf/tests/tests.h
@@ -91,6 +91,9 @@ int test__cpu_map_print(int subtest);
int test__sdt_event(int subtest);
int test__is_printable_array(int subtest);
int test__bitmap_print(int subtest);
+int test__clang(int subtest);
+const char *test__clang_subtest_get_desc(int subtest);
+int test__clang_subtest_get_nr(void);

#if defined(__arm__) || defined(__aarch64__)
#ifdef HAVE_DWARF_UNWIND_SUPPORT
diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index eb60e61..20044d0 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -123,6 +123,8 @@ libperf-$(CONFIG_LIBELF) += genelf.o
libperf-$(CONFIG_LIBELF) += genelf_debug.o
endif

+libperf-$(CONFIG_CXX) += c++/
+
CFLAGS_config.o += -DETC_PERFCONFIG="BUILD_STR($(ETC_PERFCONFIG_SQ))"
# avoid compiler warnings in 32-bit mode
CFLAGS_genelf_debug.o += -Wno-packed
diff --git a/tools/perf/util/c++/Build b/tools/perf/util/c++/Build
new file mode 100644
index 0000000..988fef1
--- /dev/null
+++ b/tools/perf/util/c++/Build
@@ -0,0 +1,2 @@
+libperf-$(CONFIG_CLANGLLVM) += clang.o
+libperf-$(CONFIG_CLANGLLVM) += clang-test.o
diff --git a/tools/perf/util/c++/clang-c.h b/tools/perf/util/c++/clang-c.h
new file mode 100644
index 0000000..dcde4b5
--- /dev/null
+++ b/tools/perf/util/c++/clang-c.h
@@ -0,0 +1,16 @@
+#ifndef PERF_UTIL_CLANG_C_H
+#define PERF_UTIL_CLANG_C_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern void perf_clang__init(void);
+extern void perf_clang__cleanup(void);
+
+extern int test__clang_to_IR(void);
+
+#ifdef __cplusplus
+}
+#endif
+#endif
diff --git a/tools/perf/util/c++/clang-test.cpp b/tools/perf/util/c++/clang-test.cpp
new file mode 100644
index 0000000..3da6bfa
--- /dev/null
+++ b/tools/perf/util/c++/clang-test.cpp
@@ -0,0 +1,31 @@
+#include "clang.h"
+#include "clang-c.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/LLVMContext.h"
+
+class perf_clang_scope {
+public:
+ explicit perf_clang_scope() {perf_clang__init();}
+ ~perf_clang_scope() {perf_clang__cleanup();}
+};
+
+extern "C" {
+
+int test__clang_to_IR(void)
+{
+ perf_clang_scope _scope;
+
+ std::unique_ptr<llvm::Module> M =
+ perf::getModuleFromSource("perf-test.c",
+ "int myfunc(void) {return 1;}");
+
+ if (!M)
+ return -1;
+
+ for (llvm::Function& F : *M)
+ if (F.getName() == "myfunc")
+ return 0;
+ return -1;
+}
+
+}
diff --git a/tools/perf/util/c++/clang.cpp b/tools/perf/util/c++/clang.cpp
new file mode 100644
index 0000000..c17b117
--- /dev/null
+++ b/tools/perf/util/c++/clang.cpp
@@ -0,0 +1,96 @@
+/*
+ * llvm C frontend for perf. Support dynamically compile C file
+ *
+ * Inspired by clang example code:
+ * http://llvm.org/svn/llvm-project/cfe/trunk/examples/clang-interpreter/main.cpp
+ *
+ * Copyright (C) 2016 Wang Nan <wangnan0@huawei.com>
+ * Copyright (C) 2016 Huawei Inc.
+ */
+
+#include "clang/CodeGen/CodeGenAction.h"
+#include "clang/Frontend/CompilerInvocation.h"
+#include "clang/Frontend/CompilerInstance.h"
+#include "clang/Frontend/TextDiagnosticPrinter.h"
+#include "clang/Tooling/Tooling.h"
+#include "llvm/IR/Module.h"
+#include "llvm/Option/Option.h"
+#include "llvm/Support/ManagedStatic.h"
+#include <memory>
+
+#include "clang.h"
+#include "clang-c.h"
+
+namespace perf {
+
+static std::unique_ptr<llvm::LLVMContext> LLVMCtx;
+
+using namespace clang;
+
+static vfs::InMemoryFileSystem *
+buildVFS(StringRef& Name, StringRef& Content)
+{
+ vfs::InMemoryFileSystem *VFS = new vfs::InMemoryFileSystem(true);
+ VFS->addFile(Twine(Name), 0, llvm::MemoryBuffer::getMemBuffer(Content));
+ return VFS;
+}
+
+static CompilerInvocation *
+createCompilerInvocation(StringRef& Path, DiagnosticsEngine& Diags)
+{
+ llvm::opt::ArgStringList CCArgs {
+ "-cc1",
+ "-triple", "bpf-pc-linux",
+ "-fsyntax-only",
+ "-ferror-limit", "19",
+ "-fmessage-length", "127",
+ "-O2",
+ "-nostdsysteminc",
+ "-nobuiltininc",
+ "-vectorize-loops",
+ "-vectorize-slp",
+ "-Wno-unused-value",
+ "-Wno-pointer-sign",
+ "-x", "c"};
+ CompilerInvocation *CI = tooling::newInvocation(&Diags, CCArgs);
+
+ FrontendOptions& Opts = CI->getFrontendOpts();
+ Opts.Inputs.clear();
+ Opts.Inputs.emplace_back(Path, IK_C);
+ return CI;
+}
+
+std::unique_ptr<llvm::Module>
+getModuleFromSource(StringRef Name, StringRef Content)
+{
+ CompilerInstance Clang;
+ Clang.createDiagnostics();
+
+ IntrusiveRefCntPtr<vfs::FileSystem> VFS = buildVFS(Name, Content);
+ Clang.setVirtualFileSystem(&*VFS);
+
+ IntrusiveRefCntPtr<CompilerInvocation> CI =
+ createCompilerInvocation(Name, Clang.getDiagnostics());
+ Clang.setInvocation(&*CI);
+
+ std::unique_ptr<CodeGenAction> Act(new EmitLLVMOnlyAction(&*LLVMCtx));
+ if (!Clang.ExecuteAction(*Act))
+ return std::unique_ptr<llvm::Module>(nullptr);
+
+ return Act->takeModule();
+}
+
+}
+
+extern "C" {
+void perf_clang__init(void)
+{
+ perf::LLVMCtx.reset(new llvm::LLVMContext());
+}
+
+void perf_clang__cleanup(void)
+{
+ perf::LLVMCtx.reset(nullptr);
+ llvm::llvm_shutdown();
+}
+}
diff --git a/tools/perf/util/c++/clang.h b/tools/perf/util/c++/clang.h
new file mode 100644
index 0000000..f64483b
--- /dev/null
+++ b/tools/perf/util/c++/clang.h
@@ -0,0 +1,16 @@
+#ifndef PERF_UTIL_CLANG_H
+#define PERF_UTIL_CLANG_H
+
+#include "llvm/ADT/StringRef.h"
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/IR/Module.h"
+#include <memory>
+namespace perf {
+
+using namespace llvm;
+
+std::unique_ptr<Module>
+getModuleFromSource(StringRef Name, StringRef Content);
+
+}
+#endif
--
1.8.3.4
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