diff --git a/.vscode/lsp.code-snippets b/.vscode/lsp.code-snippets
new file mode 100644
index 0000000..334faab
--- /dev/null
+++ b/.vscode/lsp.code-snippets
@@ -0,0 +1,19 @@
+{
+	// "Print to console": {
+	// 	"scope": "javascript,typescript",
+	// 	"prefix": "log",
+	// 	"body": [
+	// 		"console.log('$1');",
+	// 		"$2"
+	// 	],
+	// 	"description": "Log output to console"
+	// }
+    "allow unused": {
+        "scope": "rust",
+        "prefix": "allowunused",
+        "body": [
+            "#[allow(unused)]"
+        ],
+        "description": "#[allow(unused)]"
+    }
+}
\ No newline at end of file
diff --git a/src/completion/feature.rs b/src/completion/feature.rs
index 8e2c6e4..4946cd2 100644
--- a/src/completion/feature.rs
+++ b/src/completion/feature.rs
@@ -1,11 +1,10 @@
 use std::{fs, path::PathBuf, str::FromStr};
 
 use log::info;
-use regex::Regex;
 use ropey::RopeSlice;
 use tower_lsp::lsp_types::{CompletionItem, CompletionItemKind, CompletionItemLabelDetails, CompletionList, Position, Url};
 
-use crate::{server::LSPServer, utils::{get_word_range_at_position, resolve_path, to_escape_path}};
+use crate::{server::LSPServer, utils::{resolve_path, to_escape_path}};
 
 pub fn include_path_completion(uri: &Url, line: &RopeSlice, pos: Position) -> Option<CompletionList> {
     let line_text = line.as_str().unwrap_or("");
@@ -144,9 +143,11 @@ fn is_port_completion(line: &RopeSlice, pos: &Position) -> bool {
 
 fn get_position_port_param_completion(
     server: &LSPServer,
+    #[allow(unused)]
     line: &RopeSlice,
     url: &Url,
     pos: &Position,
+    #[allow(unused)]
     language_id: &str
 ) -> Option<CompletionList> {
     // 判断在不在一个模块内，并获取这个模块
@@ -225,7 +226,7 @@ fn get_position_port_param_completion(
     None
 }
 
-fn make_port_desc(port: &crate::core::fast_hdlparam::Port) -> String {
+fn make_port_desc(port: &crate::core::hdlparam::Port) -> String {
     let mut port_desc_array = Vec::<String>::new();
     port_desc_array.push(port.dir_type.to_string());
     if port.net_type != "unknown" {
@@ -245,11 +246,12 @@ fn make_port_desc(port: &crate::core::fast_hdlparam::Port) -> String {
     port_desc
 }
 
-fn make_param_desc(param: &crate::core::fast_hdlparam::Parameter) -> String {
+fn make_param_desc(param: &crate::core::hdlparam::Parameter) -> String {
     let mut param_desc_array = Vec::<String>::new();
     param_desc_array.push(format!("parameter {}", param.name));
 
     if param.init != "unknown" {
+        param_desc_array.push("=".to_string());
         param_desc_array.push(param.init.to_string());
     }
     
diff --git a/src/completion/vhdl.rs b/src/completion/vhdl.rs
index e09367a..2456e4e 100644
--- a/src/completion/vhdl.rs
+++ b/src/completion/vhdl.rs
@@ -65,6 +65,7 @@ pub fn completion(server: &LSPServer, params: &CompletionParams) -> Option<Compl
 }
 
 fn completion_item_to_lsp_item(
+    #[allow(unused)]
     server: &LSPServer,
     item: vhdl_lang::CompletionItem,
 ) -> CompletionItem {
diff --git a/src/core/cache_storage.rs b/src/core/cache_storage.rs
new file mode 100644
index 0000000..0ca4134
--- /dev/null
+++ b/src/core/cache_storage.rs
@@ -0,0 +1,12 @@
+/// 用于进行高效 IR 缓存的模块
+
+
+#[allow(unused)]
+pub fn dump_ir_storage() {
+
+}
+
+#[allow(unused)]
+pub fn load_ir_storage() {
+
+}
\ No newline at end of file
diff --git a/src/core/fast_hdlparam.rs b/src/core/hdlparam.rs
similarity index 100%
rename from src/core/fast_hdlparam.rs
rename to src/core/hdlparam.rs
diff --git a/src/core/mod.rs b/src/core/mod.rs
index d9427ff..4650153 100644
--- a/src/core/mod.rs
+++ b/src/core/mod.rs
@@ -1,7 +1,7 @@
-pub mod fast_hdlparam;
-// pub use fast_hdlparam::*;
+pub mod hdlparam;
 
 pub mod sv_parser;
-// pub use sv_parser::*;
 
-pub mod vhdl_parser;
\ No newline at end of file
+pub mod vhdl_parser;
+
+pub mod cache_storage;
\ No newline at end of file
diff --git a/src/core/sv_parser.rs b/src/core/sv_parser.rs
index 2f22df5..f60247b 100644
--- a/src/core/sv_parser.rs
+++ b/src/core/sv_parser.rs
@@ -11,7 +11,7 @@ use sv_parser::{unwrap_node, Locate, RefNode, SyntaxTree};
 use crate::sources::recovery_sv_parse;
 use crate::utils::to_escape_path;
 
-use super::fast_hdlparam::{FastHdlparam, Macro};
+use super::hdlparam::{FastHdlparam, Macro};
 
 #[allow(unused)]
 pub fn sv_parser(path: &str) -> Option<FastHdlparam> {
@@ -86,7 +86,7 @@ pub fn make_fast_from_syntaxtree(syntax_tree: &SyntaxTree, path: &PathBuf) -> Re
                                     Some(RefNode::DefaultText(x)) => syntax_tree.get_str(&x.nodes.0).unwrap(),
                                     _ => "Unknown"
                                 };
-                                params_vec.push(crate::core::fast_hdlparam::DefineParam { name: param_name.to_string(), value: param_val.to_string() });
+                                params_vec.push(crate::core::hdlparam::DefineParam { name: param_name.to_string(), value: param_val.to_string() });
                             }
                         }
                     }
@@ -590,7 +590,7 @@ fn get_identifier(node: RefNode) -> Option<Locate> {
     }
 }
 
-fn get_includes(path: &PathBuf) -> Vec<crate::core::fast_hdlparam::Include> {
+fn get_includes(path: &PathBuf) -> Vec<crate::core::hdlparam::Include> {
     let mut includes = Vec::new();
 
     let file = File::open(path).unwrap();
@@ -607,13 +607,13 @@ fn get_includes(path: &PathBuf) -> Vec<crate::core::fast_hdlparam::Include> {
                 let path = parts[1];
                 let last_character = line_content.find(path).unwrap() + path.len();
 
-                includes.push(crate::core::fast_hdlparam::Include {
+                includes.push(crate::core::hdlparam::Include {
                     path: path.to_string(),
-                    range: crate::core::fast_hdlparam::Range {
-                        start: crate::core::fast_hdlparam::Position {
+                    range: crate::core::hdlparam::Range {
+                        start: crate::core::hdlparam::Position {
                             line: (line_number + 1) as u32, character: 1
                         },
-                        end: crate::core::fast_hdlparam::Position {
+                        end: crate::core::hdlparam::Position {
                             line: (line_number + 1) as u32, character: last_character as u32
                         }
                     }
diff --git a/src/core/vhdl_parser.rs b/src/core/vhdl_parser.rs
index 0e8976a..d648720 100644
--- a/src/core/vhdl_parser.rs
+++ b/src/core/vhdl_parser.rs
@@ -3,7 +3,7 @@ use std::path::PathBuf;
 use vhdl_lang::ast::DesignFile;
 use vhdl_lang::{kind_str, Token, VHDLParser, VHDLStandard};
 
-use super::fast_hdlparam::*;
+use super::hdlparam::*;
 
 #[allow(unused)]
 pub fn vhdl_parser(path: &str) -> FastHdlparam {
diff --git a/src/definition/feature.rs b/src/definition/feature.rs
index 5e5b94b..343cf4c 100644
--- a/src/definition/feature.rs
+++ b/src/definition/feature.rs
@@ -5,7 +5,7 @@ use regex::Regex;
 use ropey::RopeSlice;
 use tower_lsp::lsp_types::{GotoDefinitionResponse, LocationLink, Position, Range, Url};
 
-use crate::{core::fast_hdlparam::FastHdlparam, server::LSPServer, utils::{get_word_range_at_position, resolve_path, to_escape_path}};
+use crate::{core::hdlparam::FastHdlparam, server::LSPServer, utils::{get_word_range_at_position, resolve_path, to_escape_path}};
 
 /// 跳转到 include 的文件
 pub fn goto_include_definition(uri: &Url, line: &RopeSlice, pos: Position) -> Option<GotoDefinitionResponse> {
diff --git a/src/hover/feature.rs b/src/hover/feature.rs
index 1fbc935..58573b7 100644
--- a/src/hover/feature.rs
+++ b/src/hover/feature.rs
@@ -5,7 +5,7 @@ use regex::Regex;
 use ropey::RopeSlice;
 use tower_lsp::lsp_types::{Hover, HoverContents, LanguageString, MarkedString, Position, Range, Url};
 
-use crate::{core::fast_hdlparam::{Define, FastHdlparam}, server::LSPServer};
+use crate::{core::hdlparam::{Define, FastHdlparam}, server::LSPServer};
 
 use super::{get_word_range_at_position, resolve_path, to_escape_path};
 
@@ -290,7 +290,7 @@ pub fn hover_position_port_param(
     None
 }
 
-fn make_port_desc_hover(port: &crate::core::fast_hdlparam::Port, range: &Range, language_id: &str) -> Hover {
+fn make_port_desc_hover(port: &crate::core::hdlparam::Port, range: &Range, language_id: &str) -> Hover {
     let mut port_desc_array = Vec::<String>::new();
     port_desc_array.push(port.dir_type.to_string());
     if port.net_type != "unknown" {
@@ -317,11 +317,12 @@ fn make_port_desc_hover(port: &crate::core::fast_hdlparam::Port, range: &Range,
     }
 }
 
-fn make_param_desc_hover(param: &crate::core::fast_hdlparam::Parameter, range: &Range, language_id: &str) -> Hover {
+fn make_param_desc_hover(param: &crate::core::hdlparam::Parameter, range: &Range, language_id: &str) -> Hover {
     let mut param_desc_array = Vec::<String>::new();
     param_desc_array.push(format!("parameter {}", param.name));
 
     if param.init != "unknown" {
+        param_desc_array.push("=".to_string());
         param_desc_array.push(param.init.to_string());
     }
     
@@ -394,7 +395,7 @@ pub fn hover_module_declaration(
 
 
 /// 根据 module 获取 module 的简单描述代码
-fn make_module_profile_code(module: &crate::core::fast_hdlparam::Module) -> String {
+fn make_module_profile_code(module: &crate::core::hdlparam::Module) -> String {
     let mut codes = Vec::<String>::new();
     let param_num = module.params.len();
     let port_num = module.ports.len();
diff --git a/src/request/mod.rs b/src/request/mod.rs
index e6ce8be..b106c97 100644
--- a/src/request/mod.rs
+++ b/src/request/mod.rs
@@ -1,3 +1,5 @@
+use std::borrow::Cow;
+use std::str::FromStr;
 use std::{fs, future};
 use std::path::PathBuf;
 use std::sync::Arc;
@@ -9,9 +11,10 @@ use serde::{Deserialize, Serialize};
 use tower_lsp::jsonrpc::Result;
 use tower_lsp::lsp_types::*;
 
-use crate::core::fast_hdlparam::FastHdlparam;
+use crate::core::hdlparam::FastHdlparam;
 use crate::core::sv_parser::make_fast_from_syntaxtree;
 
+use crate::core::vhdl_parser::{make_fast_from_design_file, vhdl_parse};
 use crate::utils::*;
 use crate::server::{Backend, GLOBAL_BACKEND};
 use crate::sources::recovery_sv_parse;
@@ -85,9 +88,22 @@ fn make_textdocumenitem_from_path(path_buf: &PathBuf) -> Option<TextDocumentItem
 }
 
 /// 前端交互接口： do_fast，输入文件路径，计算出对应的 fast 结构
-pub fn do_fast<'a>(path: String,  _server: &Arc<Backend>) -> Result<FastHdlparam> {
+pub fn do_fast<'a>(path: String, backend: &Arc<Backend>) -> Result<FastHdlparam> {
     info!("parse fast {}", path);
+    
+    let language_id = get_language_id_by_path_str(&path);
+    match language_id.as_str() {
+        "vhdl" => do_vhdl_fast(&path, backend),
+        "verilog" | "systemverilog" => do_sv_fast(&path, backend),
+        _ => Err(tower_lsp::jsonrpc::Error {
+            code: tower_lsp::jsonrpc::ErrorCode::InvalidRequest,
+            message: Cow::Owned(format!("invalid file: {path}, expect vhdl, verilog or system verilog!")),
+            data: None
+        })
+    }
+}
 
+fn do_sv_fast(path: &str, backend: &Arc<Backend>) -> Result<FastHdlparam> {
     let path_buf = PathBuf::from(&path);
 
     let doc = match make_textdocumenitem_from_path(&path_buf) {
@@ -95,7 +111,7 @@ pub fn do_fast<'a>(path: String,  _server: &Arc<Backend>) -> Result<FastHdlparam
         None => {
             let api_error = tower_lsp::jsonrpc::Error {
                 code: tower_lsp::jsonrpc::ErrorCode::InvalidParams,
-                message: std::borrow::Cow::Owned(format!("cannot make doc from path : {path}")),
+                message: Cow::Owned(format!("cannot make doc from path : {path}")),
                 data: None
             };
         
@@ -115,27 +131,42 @@ pub fn do_fast<'a>(path: String,  _server: &Arc<Backend>) -> Result<FastHdlparam
         &includes
     );
 
+    let sources = &backend.server.srcs;
     if let Some(syntax_tree) = parse_result {
         if let Ok(fast) = make_fast_from_syntaxtree(&syntax_tree, &path_buf) {
-            let hdl_param = _server.server.srcs.hdl_param.clone();
+            let hdl_param = sources.hdl_param.clone();
             hdl_param.update_fast(path.to_string(), fast.clone());
             return Ok(fast);
         }
     }
 
-    let api_error = tower_lsp::jsonrpc::Error {
+    Err(tower_lsp::jsonrpc::Error {
         code: tower_lsp::jsonrpc::ErrorCode::ParseError,
-        message: std::borrow::Cow::Owned("message".to_string()),
+        message: Cow::Owned(format!("error happen when parse {path} [do_sv_fast]")),
         data: None
-    };
+    })
+}
 
-    Err(api_error)
+fn do_vhdl_fast(path: &str, backend: &Arc<Backend>) -> Result<FastHdlparam> {
+    let sources = &backend.server.srcs;
+    let pathbuf = PathBuf::from_str(path).unwrap();
+    if let Some(design_file) = vhdl_parse(&pathbuf) {
+        let hdl_param = sources.hdl_param.clone();
+        if let Some(fast) = make_fast_from_design_file(&design_file) {
+            hdl_param.update_fast(path.to_string(), fast.clone());
+            return Ok(fast);
+        }
+    }
+
+    Err(tower_lsp::jsonrpc::Error {
+        code: tower_lsp::jsonrpc::ErrorCode::ParseError,
+        message: Cow::Owned(format!("error happen when parse {path} in [do_vhdl_fast]")),
+        data: None
+    })
 }
 
 
-
 // 下面是服务端发送给客户端的
-
 #[derive(Serialize, Deserialize)]
 pub struct StringNotification {
     pub content: String
diff --git a/src/sources.rs b/src/sources.rs
index 7f60bbf..77f54f1 100644
--- a/src/sources.rs
+++ b/src/sources.rs
@@ -1,4 +1,4 @@
-use crate::core::fast_hdlparam::HdlParam;
+use crate::core::hdlparam::HdlParam;
 use crate::core::sv_parser::make_fast_from_syntaxtree;
 use crate::core::vhdl_parser::make_fast_from_design_file;
 use crate::core::vhdl_parser::vhdl_parse;
diff --git a/src/utils/fast.rs b/src/utils/fast.rs
index 9a02b63..babafd6 100644
--- a/src/utils/fast.rs
+++ b/src/utils/fast.rs
@@ -1,5 +1,5 @@
 
-use crate::{core::fast_hdlparam::Define, server::LSPServer};
+use crate::{core::hdlparam::Define, server::LSPServer};
 
 impl LSPServer {
     /// 根据输入的 macro 名字，寻找 fast 中存在的第一个 macro
diff --git a/src/utils/file.rs b/src/utils/file.rs
index dc529ff..ac4fcf7 100644
--- a/src/utils/file.rs
+++ b/src/utils/file.rs
@@ -1,4 +1,4 @@
-use std::{fs, path::PathBuf, str::FromStr};
+use std::{fs, path::PathBuf};
 
 use log::info;
 use ropey::Rope;
diff --git a/src/utils/mod.rs b/src/utils/mod.rs
index 2d83b0c..c38e2ec 100644
--- a/src/utils/mod.rs
+++ b/src/utils/mod.rs
@@ -79,6 +79,8 @@ pub fn get_word_range_at_position(line: &RopeSlice, pos: Position, regex: Regex)
 }
 
 /// 根据 uri 获取 hdl 的 language id
+/// 返回值为 "vhdl" | "verilog" | "systemverilog" | "plaintext"
+/// 不采用枚举是因为需要在 lsp 中使用到它们的字符串值
 pub fn get_language_id_by_uri(uri: &Url) -> String {
     let path = uri.path();
     let ext_name = std::path::Path::new(path)
@@ -86,13 +88,28 @@ pub fn get_language_id_by_uri(uri: &Url) -> String {
         .and_then(std::ffi::OsStr::to_str)
         .unwrap_or("");
 
+    get_language_id_by_extname(ext_name)
+}
+
+/// 根据路径字符串获取 hdl 的 language id
+/// 返回值为 "vhdl" | "verilog" | "systemverilog" | "plaintext"
+/// 不采用枚举是因为需要在 lsp 中使用到它们的字符串值
+pub fn get_language_id_by_path_str(path_str: &str) -> String {
+    let ext_name = std::path::Path::new(path_str)
+        .extension()
+        .and_then(std::ffi::OsStr::to_str)
+        .unwrap_or("");
+    get_language_id_by_extname(ext_name)
+}
+
+fn get_language_id_by_extname(ext_name: &str) -> String {
     match ext_name {
         "vhd" | "vhdl" | "vho" | "vht" => "vhdl".to_string(),
         "v" | "V" | "vh" | "vl" => "verilog".to_string(),
         "sv" | "svh" => "systemverilog".to_string(),
         _ => "plaintext".to_string()
     }
-}
+} 
 
 /// 根据基础路径和给出的 path 路径，计算出绝对路径
 ///