ABI checker: when invoking via build system, explicitly mention ABI breakge in diagnostics

The error messages emitted from the ABI checker are mostly explanations of breakages. We should
explicitly mention why they are emitted to differentiate them from other compiler diagnostics.

rdar://68864860

Author: nkcsgexi

test/api-digester/breakage-allowlist.swift

@@ -10,29 +10,29 @@
 // RUN: echo "public func foo() {}" > %t.mod1/Foo.swift
 // RUN: echo "public func bar() {}" > %t.mod2/Foo.swift
 
-// RUN: echo "Foo: func foo() has been removed" > %t/incomplete-allowlist.txt
-// RUN: echo "Foo: func foo() has been removed" > %t/complete-allowlist.txt
-// RUN: echo "Foo: func bar() is a new API without @available attribute" >> %t/complete-allowlist.txt
+// RUN: echo "ABI breakage: func foo() has been removed" > %t/incomplete-allowlist.txt
+// RUN: echo "ABI breakage: func foo() has been removed" > %t/complete-allowlist.txt
+// RUN: echo "ABI breakage: func bar() is a new API without @available attribute" >> %t/complete-allowlist.txt
 
 // RUN: %target-swift-frontend -disable-objc-attr-requires-foundation-module -emit-module -o %t.mod1/Foo.swiftmodule  %t.mod1/Foo.swift -parse-as-library -enable-library-evolution -emit-module-source-info -emit-module-source-info-path %t.mod1/Foo.swiftsourceinfo -emit-module-interface-path %t.mod1/Foo.swiftinterface -module-name Foo -swift-version 5
 
 // RUN: %target-swift-frontend -disable-objc-attr-requires-foundation-module -emit-module -o %t.mod2/Foo.swiftmodule  %t.mod2/Foo.swift -parse-as-library -enable-library-evolution -emit-module-source-info -emit-module-source-info-path %t.mod2/Foo.swiftsourceinfo -emit-module-interface-path %t.mod2/Foo.swiftinterface -module-name Foo -swift-version 5
 
 // RUN: %api-digester -dump-sdk -module Foo -output-dir %t.baseline -module-cache-path %t.module-cache %clang-importer-sdk-nosource -I %t.mod1 -abi -use-interface-for-module Foo
 
-// RUN: %api-digester -diagnose-sdk -print-module -baseline-dir %t.baseline -module Foo -I %t.mod2 -module-cache-path %t.module-cache %clang-importer-sdk-nosource -abi -breakage-allowlist-path %t/complete-allowlist.txt -o %t/expected-diags.txt
+// RUN: %api-digester -diagnose-sdk -baseline-dir %t.baseline -module Foo -I %t.mod2 -module-cache-path %t.module-cache %clang-importer-sdk-nosource -abi -breakage-allowlist-path %t/complete-allowlist.txt -o %t/expected-diags.txt
 
-// RUN: not %api-digester -diagnose-sdk -print-module -baseline-dir %t.baseline -module Foo -I %t.mod2 -module-cache-path %t.module-cache %clang-importer-sdk-nosource -abi -compiler-style-diags
+// RUN: not %api-digester -diagnose-sdk -baseline-dir %t.baseline -module Foo -I %t.mod2 -module-cache-path %t.module-cache %clang-importer-sdk-nosource -abi -compiler-style-diags
 
-// RUN: not %api-digester -diagnose-sdk -print-module -baseline-dir %t.baseline -module Foo -I %t.mod2 -module-cache-path %t.module-cache %clang-importer-sdk-nosource -abi -compiler-style-diags -breakage-allowlist-path %t/incomplete-allowlist.txt
+// RUN: not %api-digester -diagnose-sdk -baseline-dir %t.baseline -module Foo -I %t.mod2 -module-cache-path %t.module-cache %clang-importer-sdk-nosource -abi -compiler-style-diags -breakage-allowlist-path %t/incomplete-allowlist.txt
 
-// RUN: %api-digester -diagnose-sdk -print-module -baseline-dir %t.baseline -module Foo -I %t.mod2 -module-cache-path %t.module-cache %clang-importer-sdk-nosource -abi -compiler-style-diags -breakage-allowlist-path %t/complete-allowlist.txt
+// RUN: %api-digester -diagnose-sdk -baseline-dir %t.baseline -module Foo -I %t.mod2 -module-cache-path %t.module-cache %clang-importer-sdk-nosource -abi -compiler-style-diags -breakage-allowlist-path %t/complete-allowlist.txt
 
-// RUN: not %api-digester -diagnose-sdk -print-module -baseline-dir %t.baseline -module Foo -I %t.mod2 -module-cache-path %t.module-cache %clang-importer-sdk-nosource -abi -serialize-diagnostics-path %t/serialized-diag.dia
+// RUN: not %api-digester -diagnose-sdk -baseline-dir %t.baseline -module Foo -I %t.mod2 -module-cache-path %t.module-cache %clang-importer-sdk-nosource -abi -serialize-diagnostics-path %t/serialized-diag.dia
 // RUN: ls %t/serialized-diag.dia
 
-// RUN: not %api-digester -diagnose-sdk -print-module -baseline-dir %t.baseline -module Foo -I %t.mod2 -module-cache-path %t.module-cache %clang-importer-sdk-nosource -abi -serialize-diagnostics-path %t/serialized-diag.dia -breakage-allowlist-path %t/incomplete-allowlist.txt
+// RUN: not %api-digester -diagnose-sdk -baseline-dir %t.baseline -module Foo -I %t.mod2 -module-cache-path %t.module-cache %clang-importer-sdk-nosource -abi -serialize-diagnostics-path %t/serialized-diag.dia -breakage-allowlist-path %t/incomplete-allowlist.txt
 // RUN: ls %t/serialized-diag.dia
 
-// RUN: %api-digester -diagnose-sdk -print-module -baseline-dir %t.baseline -module Foo -I %t.mod2 -module-cache-path %t.module-cache %clang-importer-sdk-nosource -abi -serialize-diagnostics-path %t/serialized-diag.dia -breakage-allowlist-path %t/complete-allowlist.txt
+// RUN: %api-digester -diagnose-sdk -baseline-dir %t.baseline -module Foo -I %t.mod2 -module-cache-path %t.module-cache %clang-importer-sdk-nosource -abi -serialize-diagnostics-path %t/serialized-diag.dia -breakage-allowlist-path %t/complete-allowlist.txt
 // RUN: ls %t/serialized-diag.dia

test/api-digester/compare-dump-abi.swift

@@ -18,5 +18,5 @@
 // RUN: not %api-digester -diagnose-sdk -print-module -baseline-dir %t.baseline -module cake -I %t.mod2 -I %S/Inputs/APINotesLeft -module-cache-path %t.module-cache %clang-importer-sdk-nosource -abi -o %t.result -compiler-style-diags 2> %t.abi.compiler.diags
 // RUN: %FileCheck %s < %t.abi.compiler.diags
 
-// CHECK: cake_current/cake.swift:39:15: error: cake: struct C6 is now with @frozen
-// CHECK: cake_current/cake.swift:41:13: error: cake: enum IceKind is now without @frozen
+// CHECK: cake_current/cake.swift:39:15: error: ABI breakage: struct C6 is now with @frozen
+// CHECK: cake_current/cake.swift:41:13: error: ABI breakage: enum IceKind is now without @frozen

tools/swift-api-digester/ModuleAnalyzerNodes.cpp

@@ -409,10 +409,16 @@ StringRef SDKNodeDecl::getScreenInfo() const {
   auto &Ctx = getSDKContext();
   llvm::SmallString<64> SS;
   llvm::raw_svector_ostream OS(SS);
-  if (Ctx.getOpts().PrintModule)
-    OS << ModuleName;
-  if (!HeaderName.empty())
-    OS << "(" << HeaderName << ")";
+  if (Ctx.getOpts().CompilerStyle) {
+    // Compiler style we don't need source info
+    OS << (Ctx.checkingABI() ? "ABI breakage" : "API breakage");
+  } else {
+    // Print more source info.
+    if (Ctx.getOpts().PrintModule)
+      OS << ModuleName;
+    if (!HeaderName.empty())
+      OS << "(" << HeaderName << ")";
+  }
   if (!OS.str().empty())
     OS << ": ";
   bool IsExtension = false;