69 lines
2.1 KiB
C++
69 lines
2.1 KiB
C++
//===-- SafeStackLayout.h - SafeStack frame layout -------------*- C++ -*--===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_LIB_CODEGEN_SAFESTACKLAYOUT_H
|
|
#define LLVM_LIB_CODEGEN_SAFESTACKLAYOUT_H
|
|
|
|
#include "SafeStackColoring.h"
|
|
|
|
namespace llvm {
|
|
namespace safestack {
|
|
|
|
/// Compute the layout of an unsafe stack frame.
|
|
class StackLayout {
|
|
unsigned MaxAlignment;
|
|
|
|
struct StackRegion {
|
|
unsigned Start;
|
|
unsigned End;
|
|
StackColoring::LiveRange Range;
|
|
StackRegion(unsigned Start, unsigned End,
|
|
const StackColoring::LiveRange &Range)
|
|
: Start(Start), End(End), Range(Range) {}
|
|
};
|
|
/// The list of current stack regions, sorted by StackRegion::Start.
|
|
SmallVector<StackRegion, 16> Regions;
|
|
|
|
struct StackObject {
|
|
const Value *Handle;
|
|
unsigned Size, Alignment;
|
|
StackColoring::LiveRange Range;
|
|
};
|
|
SmallVector<StackObject, 8> StackObjects;
|
|
|
|
DenseMap<const Value *, unsigned> ObjectOffsets;
|
|
|
|
void layoutObject(StackObject &Obj);
|
|
|
|
public:
|
|
StackLayout(unsigned StackAlignment) : MaxAlignment(StackAlignment) {}
|
|
/// Add an object to the stack frame. Value pointer is opaque and used as a
|
|
/// handle to retrieve the object's offset in the frame later.
|
|
void addObject(const Value *V, unsigned Size, unsigned Alignment,
|
|
const StackColoring::LiveRange &Range);
|
|
|
|
/// Run the layout computation for all previously added objects.
|
|
void computeLayout();
|
|
|
|
/// Returns the offset to the object start in the stack frame.
|
|
unsigned getObjectOffset(const Value *V) { return ObjectOffsets[V]; }
|
|
|
|
/// Returns the size of the entire frame.
|
|
unsigned getFrameSize() { return Regions.empty() ? 0 : Regions.back().End; }
|
|
|
|
/// Returns the alignment of the frame.
|
|
unsigned getFrameAlignment() { return MaxAlignment; }
|
|
void print(raw_ostream &OS);
|
|
};
|
|
|
|
} // namespace safestack
|
|
} // namespace llvm
|
|
|
|
#endif // LLVM_LIB_CODEGEN_SAFESTACKLAYOUT_H
|