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//===- ASanStackFrameLayout.h - ComputeASanStackFrameLayout -----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This header defines ComputeASanStackFrameLayout and auxiliary data structs.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TRANSFORMS_UTILS_ASANSTACKFRAMELAYOUT_H
#define LLVM_TRANSFORMS_UTILS_ASANSTACKFRAMELAYOUT_H
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/SmallVector.h"
namespace llvm {
class AllocaInst;
// These magic constants should be the same as in
// in asan_internal.h from ASan runtime in compiler-rt.
static const int kAsanStackLeftRedzoneMagic = 0xf1;
static const int kAsanStackMidRedzoneMagic = 0xf2;
static const int kAsanStackRightRedzoneMagic = 0xf3;
// Input/output data struct for ComputeASanStackFrameLayout.
struct ASanStackVariableDescription {
const char *Name; // Name of the variable that will be displayed by asan
// if a stack-related bug is reported.
uint64_t Size; // Size of the variable in bytes.
size_t Alignment; // Alignment of the variable (power of 2).
AllocaInst *AI; // The actual AllocaInst.
size_t Offset; // Offset from the beginning of the frame;
// set by ComputeASanStackFrameLayout.
};
// Output data struct for ComputeASanStackFrameLayout.
struct ASanStackFrameLayout {
// Frame description, see DescribeAddressIfStack in ASan runtime.
SmallString<64> DescriptionString;
// The contents of the shadow memory for the stack frame that we need
// to set at function entry.
SmallVector<uint8_t, 64> ShadowBytes;
size_t FrameAlignment; // Alignment for the entire frame.
size_t FrameSize; // Size of the frame in bytes.
};
void ComputeASanStackFrameLayout(
// The array of stack variables. The elements may get reordered and changed.
SmallVectorImpl<ASanStackVariableDescription> &Vars,
// AddressSanitizer's shadow granularity. Usually 8, may also be 16, 32, 64.
size_t Granularity,
// The minimal size of the left-most redzone (header).
// At least 4 pointer sizes, power of 2, and >= Granularity.
// The resulting FrameSize should be multiple of MinHeaderSize.
size_t MinHeaderSize,
// The result is put here.
ASanStackFrameLayout *Layout);
} // llvm namespace
#endif // LLVM_TRANSFORMS_UTILS_ASANSTACKFRAMELAYOUT_H
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