[libc] rename newhdrgen to just hdrgen (#118545)

Link: #117208
Fixes: #117254

Author: nickdesaulniers

libc/CMakeLists.txt

@@ -57,7 +57,7 @@ if(LIBC_BUILD_GPU_LOADER OR ((NOT LLVM_RUNTIMES_BUILD) AND LLVM_LIBC_GPU_BUILD))
   return()
 endif()
 
-add_subdirectory(newhdrgen)
+add_subdirectory(hdrgen)
 
 option(LIBC_CMAKE_VERBOSE_LOGGING
   "Log details warnings and notifications during CMake configuration." OFF)

libc/cmake/modules/LLVMLibCHeaderRules.cmake

@@ -112,7 +112,7 @@ function(add_gen_header target_name)
 
   add_custom_command(
     OUTPUT ${out_file}
-    COMMAND ${Python3_EXECUTABLE} ${LIBC_SOURCE_DIR}/newhdrgen/yaml_to_classes.py
+    COMMAND ${Python3_EXECUTABLE} ${LIBC_SOURCE_DIR}/hdrgen/yaml_to_classes.py
             ${yaml_file}
             --h_def_file ${def_file}
             ${entry_points}
@@ -126,7 +126,7 @@ function(add_gen_header target_name)
     set(decl_out_file ${LIBC_INCLUDE_DIR}/llvm-libc-decls/${relative_path})
     add_custom_command(
       OUTPUT ${decl_out_file}
-      COMMAND ${Python3_EXECUTABLE} ${LIBC_SOURCE_DIR}/newhdrgen/yaml_to_classes.py
+      COMMAND ${Python3_EXECUTABLE} ${LIBC_SOURCE_DIR}/hdrgen/yaml_to_classes.py
               ${yaml_file}
               --export-decls
               ${entry_points}

libc/docs/dev/header_generation.rst

@@ -0,0 +1,17 @@
+if(LLVM_LIBC_FULL_BUILD)
+  enable_testing()
+
+  set(NEWHDGEN_TESTS_DIR ${CMAKE_CURRENT_SOURCE_DIR}/tests)
+  set(TEST_OUTPUT_DIR ${CMAKE_BINARY_DIR}/hdrgen/output)
+
+  add_test(
+    NAME hdrgen_integration_test
+    COMMAND python3 ${NEWHDGEN_TESTS_DIR}/test_integration.py --output_dir ${TEST_OUTPUT_DIR}
+  )
+
+  add_custom_target(check-hdrgen
+    COMMAND ${CMAKE_CTEST_COMMAND} -R hdrgen_integration_test --output-on-failure
+  )
+
+  message(STATUS "Integration test for hdrgen added.")
+endif()

libc/docs/dev/source_tree_layout.rst

@@ -9,7 +9,7 @@
 class TestHeaderGenIntegration(unittest.TestCase):
     def setUp(self):
         self.output_dir = Path(
-            args.output_dir if args.output_dir else "libc/newhdrgen/tests/output"
+            args.output_dir if args.output_dir else "libc/hdrgen/tests/output"
         )
 
         self.maxDiff = None
@@ -21,7 +21,7 @@ def run_script(self, yaml_file, h_def_file, output_dir, entry_points):
         h_def_file = self.source_dir / h_def_file
         command = [
             "python3",
-            str(self.source_dir / "libc/newhdrgen/yaml_to_classes.py"),
+            str(self.source_dir / "libc/hdrgen/yaml_to_classes.py"),
             str(yaml_file),
             "--h_def_file",
             str(h_def_file),
@@ -51,10 +51,10 @@ def compare_files(self, generated_file, expected_file):
         self.assertEqual(gen_content, exp_content)
 
     def test_generate_header(self):
-        yaml_file = "libc/newhdrgen/tests/input/test_small.yaml"
-        h_def_file = "libc/newhdrgen/tests/input/test_small.h.def"
+        yaml_file = "libc/hdrgen/tests/input/test_small.yaml"
+        h_def_file = "libc/hdrgen/tests/input/test_small.h.def"
         expected_output_file = (
-            self.source_dir / "libc/newhdrgen/tests/expected_output/test_header.h"
+            self.source_dir / "libc/hdrgen/tests/expected_output/test_header.h"
         )
         output_file = self.output_dir / "test_small.h"
         entry_points = {"func_b", "func_a", "func_c", "func_d", "func_e"}