Generate necessary config files for the Clang tool on the Go side.

PiperOrigin-RevId: 655682520

tools/nvidia_driver_differ/parser/BUILD

@@ -7,7 +7,10 @@ package(
 
 go_library(
     name = "parser",
-    srcs = ["json_definitions.go"],
+    srcs = [
+        "clang_config.go",
+        "json_definitions.go",
+    ],
     visibility = ["//tools/nvidia_driver_differ:__subpackages__"],
     deps = ["@com_github_google_go_cmp//cmp:go_default_library"],
 )

tools/nvidia_driver_differ/parser/clang_config.go

@@ -0,0 +1,58 @@
+// Copyright 2024 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package parser
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+)
+
+// ClangASTConfig is the format for compilation_commands.json.
+type ClangASTConfig struct {
+	Directory string   `json:"directory"`
+	Arguments []string `json:"arguments"`
+	Filename  string   `json:"file"`
+}
+
+// NewParserConfig creates a ClangASTConfig for the given file using the list of includes.
+func NewParserConfig(directory, filename string, includes []string) ClangASTConfig {
+	args := []string{"clang"}
+	for _, include := range includes {
+		args = append(args, "-I", include)
+	}
+	args = append(args, filename)
+
+	return ClangASTConfig{
+		Directory: directory,
+		Arguments: args,
+		Filename:  filename,
+	}
+}
+
+// CreateCompileCommandsFile writes the given config to file.
+func CreateCompileCommandsFile(config []ClangASTConfig, path string) error {
+	f, err := os.Create(path)
+	if err != nil {
+		return fmt.Errorf("failed to create %s: %w", path, err)
+	}
+	defer f.Close()
+
+	if err := json.NewEncoder(f).Encode(config); err != nil {
+		return fmt.Errorf("failed to write config to file: %w", err)
+	}
+
+	return nil
+}

tools/nvidia_driver_differ/parser/json_definitions.go

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// Package parser contains functions for parsing the output of driver_ast_parser.
+// Package parser contains functions for interfacing with driver_ast_parser.
 package parser
 
 import (