[AddressSanitizer] Refactor: Permit >1 interesting operands per instruction

Summary:
Refactor getInterestingMemoryOperands() so that information about the
pointer operand is returned through an array of structures instead of
passing each piece of information separately by-value.

This is in preparation for returning information about multiple pointer
operands from a single instruction.

A side effect is that, instead of repeatedly generating the same
information through isInterestingMemoryAccess(), it is now simply collected
once and then passed around; that's probably more efficient.

HWAddressSanitizer has a bunch of copypasted code from AddressSanitizer,
so these changes have to be duplicated.

This is patch 3/4 of a patch series:
https://reviews.llvm.org/D77616 [PATCH 1/4] [AddressSanitizer] Refactor ClDebug{Min,Max} handling
https://reviews.llvm.org/D77617 [PATCH 2/4] [AddressSanitizer] Split out memory intrinsic handling
https://reviews.llvm.org/D77618 [PATCH 3/4] [AddressSanitizer] Refactor: Permit >1 interesting operands per instruction
https://reviews.llvm.org/D77619 [PATCH 4/4] [AddressSanitizer] Instrument byval call arguments

[glider: renamed llvm::InterestingMemoryOperand::Type to OpType to fix
GCC compilation]

Reviewers: kcc, glider

Reviewed By: glider

Subscribers: hiraditya, jfb, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D77618

Author: thejh

llvm/include/llvm/Transforms/Instrumentation/AddressSanitizerCommon.h

@@ -0,0 +1,49 @@
+//===--------- Definition of the AddressSanitizer class ---------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares common infrastructure for AddressSanitizer and
+// HWAddressSanitizer.
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_TRANSFORMS_INSTRUMENTATION_ADDRESSSANITIZERCOMMON_H
+#define LLVM_TRANSFORMS_INSTRUMENTATION_ADDRESSSANITIZERCOMMON_H
+
+#include "llvm/IR/Instruction.h"
+#include "llvm/IR/Module.h"
+
+namespace llvm {
+
+class InterestingMemoryOperand {
+public:
+  Use *PtrUse;
+  bool IsWrite;
+  Type *OpType;
+  uint64_t TypeSize;
+  unsigned Alignment;
+  // The mask Value, if we're looking at a masked load/store.
+  Value *MaybeMask;
+
+  InterestingMemoryOperand(Instruction *I, unsigned OperandNo, bool IsWrite,
+                           class Type *OpType, unsigned Alignment,
+                           Value *MaybeMask = nullptr)
+      : IsWrite(IsWrite), OpType(OpType), Alignment(Alignment),
+        MaybeMask(MaybeMask) {
+    const DataLayout &DL = I->getModule()->getDataLayout();
+    TypeSize = DL.getTypeStoreSizeInBits(OpType);
+    PtrUse = &I->getOperandUse(OperandNo);
+  }
+
+  Instruction *getInsn() { return cast<Instruction>(PtrUse->getUser()); }
+
+  Value *getPtr() { return PtrUse->get(); }
+};
+
+} // namespace llvm
+
+#endif