rustc: Dispose of LLVM passes in test cases

src/librustc/back/passes.rs

@@ -299,18 +299,27 @@ fn passes_exist() {
     let mut failed = ~[];
     unsafe { llvm::LLVMInitializePasses(); }
     for analysis_passes.each() |&(name,_)| {
-        if !create_pass(name).is_some() {
+        let pass = create_pass(name);
+        if !pass.is_some() {
             failed.push(name);
+        } else {
+            unsafe { llvm::LLVMDestroyPass(pass.get()) }
         }
     }
     for transform_passes.each() |&(name,_)| {
-        if !create_pass(name).is_some() {
+        let pass = create_pass(name);
+        if !pass.is_some() {
             failed.push(name);
+        } else {
+            unsafe { llvm::LLVMDestroyPass(pass.get()) }
         }
     }
     for utility_passes.each() |&(name,_)| {
-        if !create_pass(name).is_some() {
+        let pass = create_pass(name);
+        if !pass.is_some() {
             failed.push(name);
+        } else {
+            unsafe { llvm::LLVMDestroyPass(pass.get()) }
         }
     }
 

src/librustc/lib/llvm.rs

@@ -1684,6 +1684,9 @@ pub unsafe fn LLVMRunPassManager(PM: PassManagerRef,
         #[fast_ffi]
         pub unsafe fn LLVMCreatePass(PassName:*c_char) -> PassRef;
 
+        #[fast_ffi]
+        pub unsafe fn LLVMDestroyPass(P: PassRef);
+
         /** Adds a verification pass. */
         #[fast_ffi]
         pub unsafe fn LLVMAddVerifierPass(PM: PassManagerRef);

src/rustllvm/PassWrapper.cpp

@@ -63,3 +63,8 @@ extern "C" LLVMPassRef LLVMCreatePass(const char * PassName) {
         return (LLVMPassRef)0;
     }
 }
+
+extern "C" void LLVMDestroyPass(LLVMPassRef PassRef) {
+    Pass *p = unwrap(PassRef);
+    delete p;
+}

src/rustllvm/rustllvm.def.in

@@ -588,6 +588,7 @@ LLVMInlineAsm
 LLVMInitializePasses
 LLVMAddPass
 LLVMCreatePass
+LLVMDestroyPass
 LLVMDIBuilderCreate
 LLVMDIBuilderDispose
 LLVMDIBuilderFinalize