From 721c201bd55ffb73cb2ba8d39e0570fa38c44e15 Mon Sep 17 00:00:00 2001
From: dim <dim@FreeBSD.org>
Date: Wed, 15 Aug 2012 19:34:23 +0000
Subject: Vendor import of llvm trunk r161861:
http://llvm.org/svn/llvm-project/llvm/trunk@161861
---
include/llvm/MDBuilder.h | 141 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 141 insertions(+)
create mode 100644 include/llvm/MDBuilder.h
(limited to 'include/llvm/MDBuilder.h')
diff --git a/include/llvm/MDBuilder.h b/include/llvm/MDBuilder.h
new file mode 100644
index 0000000..2aa48b0
--- /dev/null
+++ b/include/llvm/MDBuilder.h
@@ -0,0 +1,141 @@
+//===---- llvm/MDBuilder.h - Builder for LLVM metadata ----------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the MDBuilder class, which is used as a convenient way to
+// create LLVM metadata with a consistent and simplified interface.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_MDBUILDER_H
+#define LLVM_MDBUILDER_H
+
+#include "llvm/Constants.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/LLVMContext.h"
+#include "llvm/Metadata.h"
+#include "llvm/ADT/APInt.h"
+
+namespace llvm {
+
+ class MDBuilder {
+ LLVMContext &Context;
+
+ public:
+ MDBuilder(LLVMContext &context) : Context(context) {}
+
+ /// \brief Return the given string as metadata.
+ MDString *createString(StringRef Str) {
+ return MDString::get(Context, Str);
+ }
+
+ //===------------------------------------------------------------------===//
+ // FPMath metadata.
+ //===------------------------------------------------------------------===//
+
+ /// \brief Return metadata with the given settings. The special value 0.0
+ /// for the Accuracy parameter indicates the default (maximal precision)
+ /// setting.
+ MDNode *createFPMath(float Accuracy) {
+ if (Accuracy == 0.0)
+ return 0;
+ assert(Accuracy > 0.0 && "Invalid fpmath accuracy!");
+ Value *Op = ConstantFP::get(Type::getFloatTy(Context), Accuracy);
+ return MDNode::get(Context, Op);
+ }
+
+ //===------------------------------------------------------------------===//
+ // Prof metadata.
+ //===------------------------------------------------------------------===//
+
+ /// \brief Return metadata containing two branch weights.
+ MDNode *createBranchWeights(uint32_t TrueWeight, uint32_t FalseWeight) {
+ uint32_t Weights[] = { TrueWeight, FalseWeight };
+ return createBranchWeights(Weights);
+ }
+
+ /// \brief Return metadata containing a number of branch weights.
+ MDNode *createBranchWeights(ArrayRef<uint32_t> Weights) {
+ assert(Weights.size() >= 2 && "Need at least two branch weights!");
+
+ SmallVector<Value *, 4> Vals(Weights.size()+1);
+ Vals[0] = createString("branch_weights");
+
+ Type *Int32Ty = Type::getInt32Ty(Context);
+ for (unsigned i = 0, e = Weights.size(); i != e; ++i)
+ Vals[i+1] = ConstantInt::get(Int32Ty, Weights[i]);
+
+ return MDNode::get(Context, Vals);
+ }
+
+ //===------------------------------------------------------------------===//
+ // Range metadata.
+ //===------------------------------------------------------------------===//
+
+ /// \brief Return metadata describing the range [Lo, Hi).
+ 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)
+ return 0;
+
+ // Return the range [Lo, Hi).
+ Type *Ty = IntegerType::get(Context, Lo.getBitWidth());
+ Value *Range[2] = { ConstantInt::get(Ty, Lo), ConstantInt::get(Ty, Hi) };
+ return MDNode::get(Context, Range);
+ }
+
+
+ //===------------------------------------------------------------------===//
+ // TBAA metadata.
+ //===------------------------------------------------------------------===//
+
+ /// \brief 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() {
+ // To ensure uniqueness the root node is self-referential.
+ MDNode *Dummy = MDNode::getTemporary(Context, ArrayRef<Value*>());
+ MDNode *Root = MDNode::get(Context, Dummy);
+ // At this point we have
+ // !0 = metadata !{} <- dummy
+ // !1 = metadata !{metadata !0} <- root
+ // Replace the dummy operand with the root node itself and delete the dummy.
+ Root->replaceOperandWith(0, Root);
+ MDNode::deleteTemporary(Dummy);
+ // We now have
+ // !1 = metadata !{metadata !1} <- self-referential root
+ return Root;
+ }
+
+ /// \brief 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) {
+ return MDNode::get(Context, createString(Name));
+ }
+
+ /// \brief 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) {
+ if (isConstant) {
+ Constant *Flags = ConstantInt::get(Type::getInt64Ty(Context), 1);
+ Value *Ops[3] = { createString(Name), Parent, Flags };
+ return MDNode::get(Context, Ops);
+ } else {
+ Value *Ops[2] = { createString(Name), Parent };
+ return MDNode::get(Context, Ops);
+ }
+ }
+
+ };
+
+} // end namespace llvm
+
+#endif
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