[Internalize] Support glob patterns for API lists

The internalize pass supports an option to provide a list of symbols
that should not be internalized. THis is useful retaining certain
defintions that should be kept alive. However, this interface is
somewhat difficult to use as it requires knowing every single symbol's
name and specifying it. Many APIs provide common prefixes for the
symbols exported by the library, so it would make sense to be able to
match these using a simple glob pattern. This patch changes the handling
from a simple string comparison to a glob pattern match.

Reviewed By: MaskRay

Differential Revision: https://reviews.llvm.org/D130319

llvm/lib/Transforms/IPO/Internalize.cpp

@@ -28,6 +28,7 @@
 #include "llvm/Pass.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Debug.h"
+#include "llvm/Support/GlobPattern.h"
 #include "llvm/Support/LineIterator.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/raw_ostream.h"
@@ -40,13 +41,13 @@ STATISTIC(NumAliases, "Number of aliases internalized");
 STATISTIC(NumFunctions, "Number of functions internalized");
 STATISTIC(NumGlobals, "Number of global vars internalized");
 
-// APIFile - A file which contains a list of symbols that should not be marked
+// APIFile - A file which contains a list of symbol glob patterns that should
-// external.
+// not be marked external.
 static cl::opt<std::string>
     APIFile("internalize-public-api-file", cl::value_desc("filename"),
             cl::desc("A file containing list of symbol names to preserve"));
 
-// APIList - A list of symbols that should not be marked internal.
+// APIList - A list of symbol glob patterns that should not be marked internal.
 static cl::list<std::string>
     APIList("internalize-public-api-list", cl::value_desc("list"),
             cl::desc("A list of symbol names to preserve"), cl::CommaSeparated);
@@ -59,29 +60,44 @@ public:
   PreserveAPIList() {
     if (!APIFile.empty())
       LoadFile(APIFile);
-    ExternalNames.insert(APIList.begin(), APIList.end());
+    for (StringRef Pattern : APIList)
+      addGlob(Pattern);
   }
 
   bool operator()(const GlobalValue &GV) {
-    return ExternalNames.count(GV.getName());
+    return llvm::any_of(
+        ExternalNames, [&](GlobPattern &GP) { return GP.match(GV.getName()); });
   }
 
 private:
   // Contains the set of symbols loaded from file
-  StringSet<> ExternalNames;
+  SmallVector<GlobPattern> ExternalNames;
+
+  void addGlob(StringRef Pattern) {
+    auto GlobOrErr = GlobPattern::create(Pattern);
+    if (!GlobOrErr) {
+      errs() << "WARNING: when loading pattern: '"
+             << toString(GlobOrErr.takeError()) << "' ignoring";
+      return;
+    }
+    ExternalNames.emplace_back(std::move(*GlobOrErr));
+  }
 
   void LoadFile(StringRef Filename) {
     // Load the APIFile...
-    ErrorOr<std::unique_ptr<MemoryBuffer>> Buf =
+    ErrorOr<std::unique_ptr<MemoryBuffer>> BufOrErr =
         MemoryBuffer::getFile(Filename);
-    if (!Buf) {
+    if (!BufOrErr) {
       errs() << "WARNING: Internalize couldn't load file '" << Filename
              << "'! Continuing as if it's empty.\n";
       return; // Just continue as if the file were empty
     }
-    for (line_iterator I(*Buf->get(), true), E; I != E; ++I)
+    Buf = std::move(*BufOrErr);
-      ExternalNames.insert(*I);
+    for (line_iterator I(*Buf, true), E; I != E; ++I)
+      addGlob(*I);
   }
+
+  std::shared_ptr<MemoryBuffer> Buf;
 };
 } // end anonymous namespace
 

llvm/test/Transforms/Internalize/globs.ll

@@ -0,0 +1,22 @@
+; RUN: opt < %s -internalize -internalize-public-api-list 'bar?,_*,*_,[ab]' -S | FileCheck %s
+
+; CHECK: @foo = internal global
+@foo = global i32 0
+
+; CHECK: @bar_ = global
+@bar_ = global i32 0
+
+; CHECK: @_foo = global
+@_foo = global i32 0
+
+; CHECK: @foo_ = global
+@foo_ = global i32 0
+
+; CHECK: @a = global
+@a = global i32 0
+
+; CHECK: @b = global
+@b = global i32 0
+
+; CHECK: @c = internal global
+@c = global i32 0