[LLVM-C] Improve Bindings to The Internalize Pass

Summary: Adds a binding to the internalize pass that allows the caller to pass a function pointer that acts as the visibility-preservation predicate.  Previously, one could only pass an unsigned value (not LLVMBool?) that directed the pass to consider "main" or not.

Reviewers: whitequark, deadalnix, harlanhaskins

Reviewed By: whitequark, harlanhaskins

Subscribers: kren1, hiraditya, llvm-commits, harlanhaskins

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D62456

llvm-svn: 366777

Author: CodaFi

llvm/include/llvm-c/Transforms/IPO.h

@@ -67,6 +67,21 @@ void LLVMAddIPSCCPPass(LLVMPassManagerRef PM);
 /** See llvm::createInternalizePass function. */
 void LLVMAddInternalizePass(LLVMPassManagerRef, unsigned AllButMain);
 
+/**
+ * Create and add the internalize pass to the given pass manager with the
+ * provided preservation callback.
+ *
+ * The context parameter is forwarded to the callback on each invocation.
+ * As such, it is the responsibility of the caller to extend its lifetime
+ * until execution of this pass has finished.
+ *
+ * @see llvm::createInternalizePass function.
+ */
+void LLVMAddInternalizePassWithMustPreservePredicate(
+    LLVMPassManagerRef PM,
+    void *Context,
+    LLVMBool (*MustPreserve)(LLVMValueRef, void *));
+
 /** See llvm::createStripDeadPrototypesPass function. */
 void LLVMAddStripDeadPrototypesPass(LLVMPassManagerRef PM);
 

llvm/lib/Transforms/IPO/IPO.cpp

@@ -121,6 +121,15 @@ void LLVMAddInternalizePass(LLVMPassManagerRef PM, unsigned AllButMain) {
   unwrap(PM)->add(createInternalizePass(PreserveMain));
 }
 
+void LLVMAddInternalizePassWithMustPreservePredicate(
+    LLVMPassManagerRef PM,
+    void *Context,
+    LLVMBool (*Pred)(LLVMValueRef, void *)) {
+  unwrap(PM)->add(createInternalizePass([=](const GlobalValue &GV) {
+    return Pred(wrap(&GV), Context) == 0 ? false : true;
+  }));
+}
+
 void LLVMAddStripDeadPrototypesPass(LLVMPassManagerRef PM) {
   unwrap(PM)->add(createStripDeadPrototypesPass());
 }