mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-02-21 21:29:41 +00:00
0b36bb37d0
from instructions. Chandler doesn't like them being here. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154813 91177308-0d34-0410-b5e6-96231b3b80d8
103 lines
3.7 KiB
C++
103 lines
3.7 KiB
C++
//===---- llvm/Support/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_SUPPORT_MDBUILDER_H
|
|
#define LLVM_SUPPORT_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) {}
|
|
|
|
/// CreateString - Return the given string as metadata.
|
|
MDString *CreateString(StringRef Str) {
|
|
return MDString::get(Context, Str);
|
|
}
|
|
|
|
//===------------------------------------------------------------------===//
|
|
// Range metadata.
|
|
//===------------------------------------------------------------------===//
|
|
|
|
/// CreateRange - 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.
|
|
//===------------------------------------------------------------------===//
|
|
|
|
/// 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() {
|
|
// 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;
|
|
}
|
|
|
|
/// 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) {
|
|
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) {
|
|
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
|