Introduce unit tests for the new BpfBytecode class

For now, BpfBytecode only stores the sections, so move there the
corresponding test from tests/codegen/general.cpp. The advantage is that
now the test is executed for all LLVM versions instead of just LLVM 12.

tests/CMakeLists.txt

@@ -19,6 +19,7 @@ endif()
 
 add_executable(bpftrace_test
   ast.cpp
+  bpfbytecode.cpp
   bpftrace.cpp
   child.cpp
   clang_parser.cpp

tests/bpfbytecode.cpp

@@ -0,0 +1,37 @@
+#include "bpfbytecode.h"
+#include "driver.h"
+#include "mocks.h"
+#include "passes/codegen_llvm.h"
+#include "passes/semantic_analyser.h"
+
+#include "gtest/gtest.h"
+
+namespace bpftrace {
+namespace test {
+namespace bpfbytecode {
+
+BpfBytecode codegen(const std::string &input)
+{
+  auto bpftrace = get_mock_bpftrace();
+
+  Driver driver(*bpftrace);
+  EXPECT_EQ(driver.parse_str(input), 0);
+
+  ast::SemanticAnalyser semantics(driver.root.get(), *bpftrace);
+  EXPECT_EQ(semantics.analyse(), 0);
+
+  ast::CodegenLLVM codegen(driver.root.get(), *bpftrace);
+  return codegen.compile();
+}
+
+TEST(bpfbytecode, populate_sections)
+{
+  auto bytecode = codegen("kprobe:foo { 1 } kprobe:bar { 1 }");
+
+  EXPECT_TRUE(bytecode.hasSection("s_kprobe:foo_1"));
+  EXPECT_TRUE(bytecode.hasSection("s_kprobe:bar_2"));
+}
+
+} // namespace bpfbytecode
+} // namespace test
+} // namespace bpftrace

tests/codegen/general.cpp

@@ -47,23 +47,6 @@ class MockBPFtrace : public BPFtrace
   }
 };
 
-TEST(codegen, populate_sections)
-{
-  auto bpftrace = get_mock_bpftrace();
-  Driver driver(*bpftrace);
-
-  ASSERT_EQ(driver.parse_str("kprobe:foo { 1 } kprobe:bar { 1 }"), 0);
-  // Override to mockbpffeature.
-  bpftrace->feature_ = std::make_unique<MockBPFfeature>(true);
-  ast::SemanticAnalyser semantics(driver.root.get(), *bpftrace);
-  ASSERT_EQ(semantics.analyse(), 0);
-  ast::CodegenLLVM codegen(driver.root.get(), *bpftrace);
-  auto bytecode = codegen.compile();
-
-  EXPECT_TRUE(bytecode.hasSection("s_kprobe:foo_1"));
-  EXPECT_TRUE(bytecode.hasSection("s_kprobe:bar_2"));
-}
-
 TEST(codegen, printf_offsets)
 {
   auto bpftrace = get_mock_bpftrace();