Turn new #file behavior off by default

Author: beccadax

include/swift/Basic/LangOptions.h

@@ -96,7 +96,7 @@ namespace swift {
 
     /// If true, '#file' evaluates to the full path rather than a
     /// human-readable string.
-    bool MagicFileIdentifierEvaluatesToPath = false;
+    bool MagicFileIdentifierEvaluatesToPath = true;
 
     ///
     /// Support for alternate usage modes

test/PlaygroundTransform/implicit_return_never.swift

@@ -13,7 +13,7 @@
 
 func f() -> Int {
     fatalError()
-// CRASH-CHECK: {{[fF]}}atal error: file main.swift (main), line [[@LINE-1]]
+// CRASH-CHECK: {{[fF]}}atal error: file {{.*}}/main.swift, line [[@LINE-1]]
 }
 
 f()

test/PlaygroundTransform/placeholder.swift

@@ -15,7 +15,7 @@
 func f(crash crash: Bool) -> Int {
   if crash {
     return <#T#>
-    // CRASH-CHECK: {{[fF]}}atal error: attempt to evaluate editor placeholder: file main.swift (main), line [[@LINE-1]]
+    // CRASH-CHECK: {{[fF]}}atal error: attempt to evaluate editor placeholder: file {{.*}}/main.swift, line [[@LINE-1]]
   } else {
     return 42
   }

test/SILGen/magic_identifier_file.swift

@@ -0,0 +1,25 @@
+// RUN: %target-swift-emit-silgen -pound-file=path -module-name Foo %s | %FileCheck --check-prefixes=BOTH,PATH %s
+// RUN: %target-swift-emit-silgen -pound-file=compact -module-name Foo %s | %FileCheck --check-prefixes=BOTH,COMPACT %s
+// RUN: not %target-swift-emit-silgen -pound-file=zyzyx -module-name Foo %s 2>&1 | %FileCheck --check-prefix=ZYZYX %s
+
+// RUN: %target-swift-emit-silgen -pound-file path -module-name Foo %s | %FileCheck --check-prefixes=BOTH,PATH %s
+// RUN: %target-swift-emit-silgen -pound-file compact -module-name Foo %s | %FileCheck --check-prefixes=BOTH,COMPACT %s
+// RUN: not %target-swift-emit-silgen -pound-file zyzyx -module-name Foo %s 2>&1 | %FileCheck --check-prefix=ZYZYX %s
+
+// RUN: %target-swift-emit-silgen %s -module-name Foo | %FileCheck --check-prefixes=BOTH,COMPACT %s
+
+// ZYZYX: error: invalid value 'zyzyx' in '-pound-file'
+
+func directUse() {
+// BOTH-LABEL: sil {{.*}} @$s3Foo9directUseyyF
+  print(#file)
+// PATH: string_literal utf8 "SOURCE_DIR/test/SILGen/magic_identifier_file.swift"
+// COMPACT: string_literal utf8 "magic_identifier_file.swift (Foo)"
+}
+
+func indirectUse() {
+// BOTH-LABEL: sil {{.*}} @$s3Foo11indirectUseyyF
+  fatalError()
+// PATH: string_literal utf8 "SOURCE_DIR/test/SILGen/magic_identifier_file.swift"
+// COMPACT: string_literal utf8 "magic_identifier_file.swift (Foo)"
+}