IRGen: Don't output the full file path in the noescape closure verification

At Odebug we print the full path to the file and in optimized mode no
file name will be included.

This mirrors what we do in Swift's asserts.

rdar://47880964

Author: aschwaighofer

lib/IRGen/GenHeap.cpp

@@ -17,6 +17,7 @@
 
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/Compiler.h"
+#include "llvm/Support/Path.h"
 #include "llvm/IR/DerivedTypes.h"
 #include "llvm/IR/Function.h"
 #include "llvm/IR/GlobalVariable.h"
@@ -1332,7 +1333,12 @@ llvm::Value *IRGenFunction::emitIsEscapingClosureCall(
   auto loc = SILLocation::decode(sourceLoc, IGM.Context.SourceMgr);
   auto line = llvm::ConstantInt::get(IGM.Int32Ty, loc.Line);
   auto col = llvm::ConstantInt::get(IGM.Int32Ty, loc.Column);
-  auto filename = IGM.getAddrOfGlobalString(loc.Filename);
+
+  // Only output the filepath in debug mode. It is going to leak into the
+  // executable. This is the same behavior as asserts.
+  auto filename = IGM.IRGen.Opts.shouldOptimize()
+                      ? IGM.getAddrOfGlobalString("")
+                      : IGM.getAddrOfGlobalString(loc.Filename);
   auto filenameLength =
       llvm::ConstantInt::get(IGM.Int32Ty, loc.Filename.size());
   auto type = llvm::ConstantInt::get(IGM.Int32Ty, verificationType);

test/IRGen/closure.swift

@@ -1,11 +1,15 @@
 // RUN: %target-swift-frontend -primary-file %s -emit-ir | %FileCheck %s
 // RUN: %target-swift-frontend -primary-file %s -emit-ir | %FileCheck %s --check-prefix=CAPTURE
+// RUN: %target-swift-frontend -primary-file %s -O -emit-ir | %FileCheck %s --check-prefix=OPT
 
 // REQUIRES: CPU=x86_64
 
+// CHECK-DAG: [[FILENAME:@[0-9]+]] = {{.*}} c"{{.*}}closure.swift\00"
+// OPT: [[FILENAME:@[0-9]+]] = {{.*}} [1 x i8] zeroinitializer
+
 // -- partial_apply context metadata
 
-// CHECK: [[METADATA:@.*]] = private constant %swift.full_boxmetadata { void (%swift.refcounted*)* @objectdestroy, i8** null, %swift.type { i64 1024 }, i32 16, i8* bitcast ({ i32, i32, i32, i32 }* @"\01l__swift5_reflection_descriptor" to i8*) }
+// CHECK-DAG: [[METADATA:@.*]] = private constant %swift.full_boxmetadata { void (%swift.refcounted*)* @objectdestroy, i8** null, %swift.type { i64 1024 }, i32 16, i8* bitcast ({ i32, i32, i32, i32 }* @"\01l__swift5_reflection_descriptor" to i8*) }
 
 func a(i i: Int) -> (Int) -> Int {
   return { x in i }
@@ -65,3 +69,11 @@ func useClosure(_ cl : () -> ()) {}
 func no_capture_descriptor(_ c: C, _ d: C, _ e: C, _ f: C, _ g: C) {
   useClosure( { _ = c ; _ = d ; _ = e ; _ = f ; _ = g })
 }
+
+// CHECK-LABEL: define hidden swiftcc { i8*, %swift.refcounted* } @"$s7closure9letEscape1fyycyyXE_tF"(i8*, %swift.opaque*)
+// CHECK: call i1 @swift_isEscapingClosureAtFileLocation(%swift.refcounted* {{.*}}, i8* getelementptr inbounds ({{.*}} [[FILENAME]]
+// OPT-LABEL: define hidden swiftcc { i8*, %swift.refcounted* } @"$s7closure9letEscape1fyycyyXE_tF"(i8*, %swift.opaque*)
+// OPT: call i1 @swift_isEscapingClosureAtFileLocation(%swift.refcounted* {{.*}}, i8* getelementptr inbounds ({{.*}} [[FILENAME]]
+func letEscape(f: () -> ()) -> () -> () {
+  return withoutActuallyEscaping(f) { return $0 }
+}