Plugin variant 2

Author: wsmoses

compiler/rustc_codegen_llvm/src/llvm_util.rs

@@ -10,6 +10,8 @@ use rustc_span::symbol::Symbol;
 use rustc_target::spec::{MergeFunctions, PanicStrategy};
 use std::ffi::{CStr, CString};
 
+use libc;
+
 use std::slice;
 use std::str;
 use std::sync::atomic::{AtomicBool, Ordering};
@@ -113,6 +115,16 @@ unsafe fn configure_llvm(sess: &Session) {
     }
 
     llvm::LLVMInitializePasses();
+    
+    for plugin in &sess.opts.cg.llvm_plugins {
+        let path = CString::new(plugin.as_bytes()).unwrap();
+        let res = libc::dlopen(path.as_ptr(), libc::RTLD_LAZY | libc::RTLD_GLOBAL);
+        if res.is_null() {
+            println!("{}", CStr::from_ptr(libc::dlerror()).to_string_lossy().into_owned());
+        }
+        println!("{:p}", res);
+        println!("{}", plugin);
+    }
 
     rustc_llvm::initialize_available_targets();
 

compiler/rustc_session/src/options.rs

@@ -789,6 +789,8 @@ options! {CodegenOptions, CodegenSetter, basic_codegen_options,
         "generate build artifacts that are compatible with linker-based LTO"),
     llvm_args: Vec<String> = (Vec::new(), parse_list, [TRACKED],
         "a list of arguments to pass to LLVM (space separated)"),
+    llvm_plugins: Vec<String> = (Vec::new(), parse_list, [TRACKED],
+        "a list LLVM plugins to enable (space separated)"),
     lto: LtoCli = (LtoCli::Unspecified, parse_lto, [TRACKED],
         "perform LLVM link-time optimizations"),
     metadata: Vec<String> = (Vec::new(), parse_list, [TRACKED],