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https://github.com/c64scene-ar/llvm-6502.git
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2867c85a37
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154850 91177308-0d34-0410-b5e6-96231b3b80d8
119 lines
4.2 KiB
C++
119 lines
4.2 KiB
C++
//===---- llvm/Support/MDBuilder.h - Builder for LLVM metadata --*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the MDBuilder class, which is used as a convenient way to
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// create LLVM metadata with a consistent and simplified interface.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_MDBUILDER_H
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#define LLVM_SUPPORT_MDBUILDER_H
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/LLVMContext.h"
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#include "llvm/Metadata.h"
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#include "llvm/ADT/APInt.h"
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namespace llvm {
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class MDBuilder {
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LLVMContext &Context;
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public:
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MDBuilder(LLVMContext &context) : Context(context) {}
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/// \brief Return the given string as metadata.
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MDString *createString(StringRef Str) {
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return MDString::get(Context, Str);
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}
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//===------------------------------------------------------------------===//
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// FPMath metadata.
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//===------------------------------------------------------------------===//
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/// \brief Return metadata with the given settings. The special value 0.0
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/// for the Accuracy parameter indicates the default (maximal precision)
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/// setting.
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MDNode *createFPMath(float Accuracy) {
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if (Accuracy == 0.0)
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return 0;
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assert(Accuracy > 0.0 && "Invalid fpmath accuracy!");
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Value *Op = ConstantFP::get(Type::getFloatTy(Context), Accuracy);
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return MDNode::get(Context, Op);
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}
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//===------------------------------------------------------------------===//
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// Range metadata.
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//===------------------------------------------------------------------===//
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/// \brief Return metadata describing the range [Lo, Hi).
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MDNode *createRange(const APInt &Lo, const APInt &Hi) {
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assert(Lo.getBitWidth() == Hi.getBitWidth() && "Mismatched bitwidths!");
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// If the range is everything then it is useless.
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if (Hi == Lo)
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return 0;
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// Return the range [Lo, Hi).
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Type *Ty = IntegerType::get(Context, Lo.getBitWidth());
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Value *Range[2] = { ConstantInt::get(Ty, Lo), ConstantInt::get(Ty, Hi) };
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return MDNode::get(Context, Range);
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}
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//===------------------------------------------------------------------===//
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// TBAA metadata.
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//===------------------------------------------------------------------===//
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/// \brief Return metadata appropriate for a TBAA root node. Each returned
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/// node is distinct from all other metadata and will never be identified
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/// (uniqued) with anything else.
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MDNode *createAnonymousTBAARoot() {
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// To ensure uniqueness the root node is self-referential.
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MDNode *Dummy = MDNode::getTemporary(Context, ArrayRef<Value*>());
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MDNode *Root = MDNode::get(Context, Dummy);
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// At this point we have
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// !0 = metadata !{} <- dummy
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// !1 = metadata !{metadata !0} <- root
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// Replace the dummy operand with the root node itself and delete the dummy.
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Root->replaceOperandWith(0, Root);
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MDNode::deleteTemporary(Dummy);
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// We now have
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// !1 = metadata !{metadata !1} <- self-referential root
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return Root;
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}
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/// \brief Return metadata appropriate for a TBAA root node with the given
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/// name. This may be identified (uniqued) with other roots with the same
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/// name.
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MDNode *createTBAARoot(StringRef Name) {
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return MDNode::get(Context, createString(Name));
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}
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/// \brief Return metadata for a non-root TBAA node with the given name,
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/// parent in the TBAA tree, and value for 'pointsToConstantMemory'.
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MDNode *createTBAANode(StringRef Name, MDNode *Parent,
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bool isConstant = false) {
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if (isConstant) {
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Constant *Flags = ConstantInt::get(Type::getInt64Ty(Context), 1);
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Value *Ops[3] = { createString(Name), Parent, Flags };
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return MDNode::get(Context, Ops);
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} else {
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Value *Ops[2] = { createString(Name), Parent };
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return MDNode::get(Context, Ops);
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}
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}
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};
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} // end namespace llvm
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#endif
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