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7e172b57e0
Summary: This change is part of step five in the series of changes to remove alignment argument from memcpy/memmove/memset in favour of alignment attributes. In particular, this changes the creation of memcpys in the SafeStack pass to set the alignment of the destination object to its stack alignment while separately setting the source byval arguments alignment to its alignment. Steps: Step 1) Remove alignment parameter and create alignment parameter attributes for memcpy/memmove/memset. ( rL322965, rC322964, rL322963 ) Step 2) Expand the IRBuilder API to allow creation of memcpy/memmove with differing source and dest alignments. ( rL323597 ) Step 3) Update Clang to use the new IRBuilder API. ( rC323617 ) Step 4) Update Polly to use the new IRBuilder API. ( rL323618 ) Step 5) Update LLVM passes that create memcpy/memmove calls to use the new IRBuilder API, and those that use use MemIntrinsicInst::[get|set]Alignment() to use [get|set]DestAlignment() and [get|set]SourceAlignment() instead. (rL323886, rL323891, rL324148, rL324273, rL324278, rL324384, rL324395, rL324402, rL324626, rL324642, rL324653, rL324654, rL324773, rL324774, rL324781, rL324784 ) Step 6) Remove the single-alignment IRBuilder API for memcpy/memmove, and the MemIntrinsicInst::[get|set]Alignment() methods. Reference http://lists.llvm.org/pipermail/llvm-dev/2015-August/089384.html http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20151109/312083.html Reviewers: eugenis, bollu Reviewed By: eugenis Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D42710 llvm-svn: 324955
85 lines
2.4 KiB
C++
85 lines
2.4 KiB
C++
//===- SafeStackLayout.h - SafeStack frame layout --------------*- 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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#ifndef LLVM_LIB_CODEGEN_SAFESTACKLAYOUT_H
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#define LLVM_LIB_CODEGEN_SAFESTACKLAYOUT_H
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#include "SafeStackColoring.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/SmallVector.h"
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namespace llvm {
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class raw_ostream;
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class Value;
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namespace safestack {
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/// Compute the layout of an unsafe stack frame.
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class StackLayout {
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unsigned MaxAlignment;
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struct StackRegion {
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unsigned Start;
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unsigned End;
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StackColoring::LiveRange Range;
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StackRegion(unsigned Start, unsigned End,
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const StackColoring::LiveRange &Range)
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: Start(Start), End(End), Range(Range) {}
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};
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/// The list of current stack regions, sorted by StackRegion::Start.
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SmallVector<StackRegion, 16> Regions;
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struct StackObject {
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const Value *Handle;
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unsigned Size, Alignment;
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StackColoring::LiveRange Range;
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};
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SmallVector<StackObject, 8> StackObjects;
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DenseMap<const Value *, unsigned> ObjectOffsets;
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DenseMap<const Value *, unsigned> ObjectAlignments;
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void layoutObject(StackObject &Obj);
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public:
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StackLayout(unsigned StackAlignment) : MaxAlignment(StackAlignment) {}
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/// Add an object to the stack frame. Value pointer is opaque and used as a
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/// handle to retrieve the object's offset in the frame later.
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void addObject(const Value *V, unsigned Size, unsigned Alignment,
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const StackColoring::LiveRange &Range);
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/// Run the layout computation for all previously added objects.
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void computeLayout();
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/// Returns the offset to the object start in the stack frame.
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unsigned getObjectOffset(const Value *V) { return ObjectOffsets[V]; }
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/// Returns the alignment of the object
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unsigned getObjectAlignment(const Value *V) { return ObjectAlignments[V]; }
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/// Returns the size of the entire frame.
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unsigned getFrameSize() { return Regions.empty() ? 0 : Regions.back().End; }
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/// Returns the alignment of the frame.
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unsigned getFrameAlignment() { return MaxAlignment; }
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void print(raw_ostream &OS);
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};
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} // end namespace safestack
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} // end namespace llvm
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#endif // LLVM_LIB_CODEGEN_SAFESTACKLAYOUT_H
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