From d41672fa697c2730fc5c52005030e30b3faec024 Mon Sep 17 00:00:00 2001
From: Sriraman Tallam <tmsriram@google.com>
Date: Thu, 28 Apr 2016 18:15:44 +0000
Subject: [PATCH] Add "PIE Level" metadata to module flags.

http://reviews.llvm.org/D19671

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267911 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/IR/Module.h       | 11 +++++++++++
 include/llvm/Support/CodeGen.h |  4 ++++
 lib/IR/Module.cpp              | 14 ++++++++++++++
 3 files changed, 29 insertions(+)

diff --git a/include/llvm/IR/Module.h b/include/llvm/IR/Module.h
index 0a6a127bb0d..25585b0cb6a 100644
--- a/include/llvm/IR/Module.h
+++ b/include/llvm/IR/Module.h
@@ -732,6 +732,17 @@ public:
   void setPICLevel(PICLevel::Level PL);
 /// @}
 
+/// @}
+/// @name Utility functions for querying and setting PIE level
+/// @{
+
+  /// \brief Returns the PIE level (small or large model)
+  PIELevel::Level getPIELevel() const;
+
+  /// \brief Set the PIE level (small or large model)
+  void setPIELevel(PIELevel::Level PL);
+/// @}
+
   /// @name Utility functions for querying and setting PGO summary
   /// @{
 
diff --git a/include/llvm/Support/CodeGen.h b/include/llvm/Support/CodeGen.h
index 0ff3d56363c..6e31ef4cb10 100644
--- a/include/llvm/Support/CodeGen.h
+++ b/include/llvm/Support/CodeGen.h
@@ -32,6 +32,10 @@ namespace llvm {
     enum Level { Default=0, Small=1, Large=2 };
   }
 
+  namespace PIELevel {
+    enum Level { Default=0, Small=1, Large=2 };
+  }
+
   // TLS models.
   namespace TLSModel {
     enum Model {
diff --git a/lib/IR/Module.cpp b/lib/IR/Module.cpp
index 10110367841..b15cac40274 100644
--- a/lib/IR/Module.cpp
+++ b/lib/IR/Module.cpp
@@ -497,6 +497,20 @@ void Module::setPICLevel(PICLevel::Level PL) {
   addModuleFlag(ModFlagBehavior::Error, "PIC Level", PL);
 }
 
+PIELevel::Level Module::getPIELevel() const {
+  auto *Val = cast_or_null<ConstantAsMetadata>(getModuleFlag("PIE Level"));
+
+  if (!Val)
+    return PIELevel::Default;
+
+  return static_cast<PIELevel::Level>(
+      cast<ConstantInt>(Val->getValue())->getZExtValue());
+}
+
+void Module::setPIELevel(PIELevel::Level PL) {
+  addModuleFlag(ModFlagBehavior::Error, "PIE Level", PL);
+}
+
 void Module::setMaximumFunctionCount(uint64_t Count) {
   addModuleFlag(ModFlagBehavior::Error, "MaxFunctionCount", Count);
 }