Add convenience methods to MDBuilder for attaching metadata to instructions,

and retrieving it from instructions.  I don't have a use for this but is seems
logical for it to exist.  While there, remove some 'const' markings from methods
which are in fact 'const' in practice, but aren't logically 'const'.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154811 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/Support/MDBuilder.h b/include/llvm/Support/MDBuilder.h
index 20f5d70c554f0c8a1b1bbecc7e8655ea0adb7f33..72b2c6746ac0d6d378fb618ba09d79c32053a9ae 100644 (file)
--- a/include/llvm/Support/MDBuilder.h
+++ b/include/llvm/Support/MDBuilder.h
@@ -17,6 +17,7 @@
 
 #include "llvm/Constants.h"
 #include "llvm/DerivedTypes.h"
+#include "llvm/Instructions.h"
 #include "llvm/LLVMContext.h"
 #include "llvm/Metadata.h"
 #include "llvm/ADT/APInt.h"
@@ -30,7 +31,7 @@ namespace llvm {
     MDBuilder(LLVMContext &context) : Context(context) {}
 
     /// CreateString - Return the given string as metadata.
-    MDString *CreateString(StringRef Str) const {
+    MDString *CreateString(StringRef Str) {
       return MDString::get(Context, Str);
     }
 
@@ -39,7 +40,7 @@ namespace llvm {
     //===------------------------------------------------------------------===//
 
     /// CreateRange - Return metadata describing the range [Lo, Hi).
-    MDNode *CreateRange(const APInt &Lo, const APInt &Hi) const {
+    MDNode *CreateRange(const APInt &Lo, const APInt &Hi) {
       assert(Lo.getBitWidth() == Hi.getBitWidth() && "Mismatched bitwidths!");
       // If the range is everything then it is useless.
       if (Hi == Lo)
@@ -51,6 +52,16 @@ namespace llvm {
       return MDNode::get(Context, Range);
     }
 
+    /// GetRangeMetadata - Get range metadata attached to an instruction.
+    MDNode *GetRangeMetadata(Instruction *I) const {
+      return I->getMetadata(LLVMContext::MD_range);
+    }
+
+    /// SetRangeMetadata - Attach range metadata to an instruction.
+    void SetRangeMetadata(Instruction *I, MDNode *RangeTag) {
+      I->setMetadata(LLVMContext::MD_range, RangeTag);
+    }
+
 
     //===------------------------------------------------------------------===//
     // TBAA metadata.
@@ -59,7 +70,7 @@ namespace llvm {
     /// CreateAnonymousTBAARoot - Return metadata appropriate for a TBAA root
     /// node.  Each returned node is distinct from all other metadata and will
     /// never be identified (uniqued) with anything else.
-    MDNode *CreateAnonymousTBAARoot() const {
+    MDNode *CreateAnonymousTBAARoot() {
       // To ensure uniqueness the root node is self-referential.
       MDNode *Dummy = MDNode::getTemporary(Context, ArrayRef<Value*>());
       MDNode *Root = MDNode::get(Context, Dummy);
@@ -77,14 +88,14 @@ namespace llvm {
     /// CreateTBAARoot - Return metadata appropriate for a TBAA root node with
     /// the given name.  This may be identified (uniqued) with other roots with
     /// the same name.
-    MDNode *CreateTBAARoot(StringRef Name) const {
+    MDNode *CreateTBAARoot(StringRef Name) {
       return MDNode::get(Context, CreateString(Name));
     }
 
     /// CreateTBAANode - Return metadata for a non-root TBAA node with the given
     /// name, parent in the TBAA tree, and value for 'pointsToConstantMemory'.
     MDNode *CreateTBAANode(StringRef Name, MDNode *Parent,
-                           bool isConstant = false) const {
+                           bool isConstant = false) {
       if (isConstant) {
         Constant *Flags = ConstantInt::get(Type::getInt64Ty(Context), 1);
         Value *Ops[3] = { CreateString(Name), Parent, Flags };
@@ -94,6 +105,17 @@ namespace llvm {
         return MDNode::get(Context, Ops);
       }
     }
+
+    /// GetTBAAMetadata - Get tbaa metadata attached to an instruction.
+    MDNode *GetTBAAMetadata(Instruction *I) const {
+      return I->getMetadata(LLVMContext::MD_tbaa);
+    }
+
+    /// SetTBAAMetadata - Attach tbaa metadata to an instruction.
+    void SetTBAAMetadata(Instruction *I, MDNode *TBAATag) {
+      I->setMetadata(LLVMContext::MD_tbaa, TBAATag);
+    }
+
   };
 
 } // end namespace llvm