From f03065847882efad78322ebfb24cd2fd0dd14c09 Mon Sep 17 00:00:00 2001
From: Rafael Espindola <rafael.espindola@gmail.com>
Date: Mon, 29 Oct 2012 02:23:07 +0000
Subject: [PATCH] Add -alias and -ralias options to match what we have for
 functions and globals.

llvm-svn: 166909
---
 test/Other/extract-alias.ll         |  9 ++++++
 tools/llvm-extract/llvm-extract.cpp | 47 +++++++++++++++++++++++++++++
 2 files changed, 56 insertions(+)

diff --git a/test/Other/extract-alias.ll b/test/Other/extract-alias.ll
index 85d1ae5b1b5..d5bab4b3f36 100644
--- a/test/Other/extract-alias.ll
+++ b/test/Other/extract-alias.ll
@@ -1,5 +1,7 @@
 ; RUN: llvm-extract -func foo -S < %s | FileCheck %s
 ; RUN: llvm-extract -delete -func foo -S < %s | FileCheck --check-prefix=DELETE %s
+; RUN: llvm-extract -alias zeda0 -S < %s | FileCheck --check-prefix=ALIAS %s
+; RUN: llvm-extract -ralias .*bar -S < %s | FileCheck --check-prefix=ALIASRE %s
 
 ; Both aliases should be converted to declarations
 ; CHECK:      @zeda0 = external global i32
@@ -20,6 +22,13 @@
 ; DELETE-NEXT:  ret void
 ; DELETE-NEXT: }
 
+; ALIAS: @zed = external global i32
+; ALIAS: @zeda0 = alias i32* @zed
+
+; ALIASRE: @a0a0bar = alias void ()* @a0bar
+; ALIASRE: @a0bar = alias void ()* @bar
+; ALIASRE: declare void @bar()
+
 @zed = global i32 0
 @zeda0 = alias i32* @zed
 
diff --git a/tools/llvm-extract/llvm-extract.cpp b/tools/llvm-extract/llvm-extract.cpp
index eb2bc22a569..ac82d98b3b7 100644
--- a/tools/llvm-extract/llvm-extract.cpp
+++ b/tools/llvm-extract/llvm-extract.cpp
@@ -59,6 +59,19 @@ ExtractRegExpFuncs("rfunc", cl::desc("Specify function(s) to extract using a "
                                      "regular expression"),
                    cl::ZeroOrMore, cl::value_desc("rfunction"));
 
+// ExtractAlias - The alias to extract from the module.
+static cl::list<std::string>
+ExtractAliases("alias", cl::desc("Specify alias to extract"),
+               cl::ZeroOrMore, cl::value_desc("alias"));
+
+
+// ExtractRegExpAliases - The aliases, matched via regular expression, to
+// extract from the module.
+static cl::list<std::string>
+ExtractRegExpAliases("ralias", cl::desc("Specify alias(es) to extract using a "
+                                        "regular expression"),
+                     cl::ZeroOrMore, cl::value_desc("ralias"));
+
 // ExtractGlobals - The globals to extract from the module.
 static cl::list<std::string>
 ExtractGlobals("glob", cl::desc("Specify global to extract"),
@@ -97,6 +110,40 @@ int main(int argc, char **argv) {
   // Use SetVector to avoid duplicates.
   SetVector<GlobalValue *> GVs;
 
+  // Figure out which aliases we should extract.
+  for (size_t i = 0, e = ExtractAliases.size(); i != e; ++i) {
+    GlobalAlias *GA = M->getNamedAlias(ExtractAliases[i]);
+    if (!GA) {
+      errs() << argv[0] << ": program doesn't contain alias named '"
+             << ExtractAliases[i] << "'!\n";
+      return 1;
+    }
+    GVs.insert(GA);
+  }
+
+  // Extract aliases via regular expression matching.
+  for (size_t i = 0, e = ExtractRegExpAliases.size(); i != e; ++i) {
+    std::string Error;
+    Regex RegEx(ExtractRegExpAliases[i]);
+    if (!RegEx.isValid(Error)) {
+      errs() << argv[0] << ": '" << ExtractRegExpAliases[i] << "' "
+        "invalid regex: " << Error;
+    }
+    bool match = false;
+    for (Module::alias_iterator GA = M->alias_begin(), E = M->alias_end();
+         GA != E; GA++) {
+      if (RegEx.match(GA->getName())) {
+        GVs.insert(&*GA);
+        match = true;
+      }
+    }
+    if (!match) {
+      errs() << argv[0] << ": program doesn't contain global named '"
+             << ExtractRegExpAliases[i] << "'!\n";
+      return 1;
+    }
+  }
+
   // Figure out which globals we should extract.
   for (size_t i = 0, e = ExtractGlobals.size(); i != e; ++i) {
     GlobalValue *GV = M->getNamedGlobal(ExtractGlobals[i]);