/Users/buildslave/jenkins/sharedspace/clang-stage2-coverage-R@2/llvm/lib/CodeGen/SafeStackLayout.h
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1 | | //===-- SafeStackLayout.h - SafeStack frame layout -------------*- C++ -*--===// |
2 | | // |
3 | | // The LLVM Compiler Infrastructure |
4 | | // |
5 | | // This file is distributed under the University of Illinois Open Source |
6 | | // License. See LICENSE.TXT for details. |
7 | | // |
8 | | //===----------------------------------------------------------------------===// |
9 | | |
10 | | #ifndef LLVM_LIB_CODEGEN_SAFESTACKLAYOUT_H |
11 | | #define LLVM_LIB_CODEGEN_SAFESTACKLAYOUT_H |
12 | | |
13 | | #include "SafeStackColoring.h" |
14 | | |
15 | | namespace llvm { |
16 | | namespace safestack { |
17 | | |
18 | | /// Compute the layout of an unsafe stack frame. |
19 | | class StackLayout { |
20 | | unsigned MaxAlignment; |
21 | | |
22 | | struct StackRegion { |
23 | | unsigned Start; |
24 | | unsigned End; |
25 | | StackColoring::LiveRange Range; |
26 | | StackRegion(unsigned Start, unsigned End, |
27 | | const StackColoring::LiveRange &Range) |
28 | 244 | : Start(Start), End(End), Range(Range) {} |
29 | | }; |
30 | | /// The list of current stack regions, sorted by StackRegion::Start. |
31 | | SmallVector<StackRegion, 16> Regions; |
32 | | |
33 | | struct StackObject { |
34 | | const Value *Handle; |
35 | | unsigned Size, Alignment; |
36 | | StackColoring::LiveRange Range; |
37 | | }; |
38 | | SmallVector<StackObject, 8> StackObjects; |
39 | | |
40 | | DenseMap<const Value *, unsigned> ObjectOffsets; |
41 | | |
42 | | void layoutObject(StackObject &Obj); |
43 | | |
44 | | public: |
45 | 145 | StackLayout(unsigned StackAlignment) : MaxAlignment(StackAlignment) {} |
46 | | /// Add an object to the stack frame. Value pointer is opaque and used as a |
47 | | /// handle to retrieve the object's offset in the frame later. |
48 | | void addObject(const Value *V, unsigned Size, unsigned Alignment, |
49 | | const StackColoring::LiveRange &Range); |
50 | | |
51 | | /// Run the layout computation for all previously added objects. |
52 | | void computeLayout(); |
53 | | |
54 | | /// Returns the offset to the object start in the stack frame. |
55 | 247 | unsigned getObjectOffset(const Value *V) { return ObjectOffsets[V]; } |
56 | | |
57 | | /// Returns the size of the entire frame. |
58 | 145 | unsigned getFrameSize() { return Regions.empty() ? 145 00 : Regions.back().End145 ; } |
59 | | |
60 | | /// Returns the alignment of the frame. |
61 | 145 | unsigned getFrameAlignment() { return MaxAlignment; } |
62 | | void print(raw_ostream &OS); |
63 | | }; |
64 | | |
65 | | } // namespace safestack |
66 | | } // namespace llvm |
67 | | |
68 | | #endif // LLVM_LIB_CODEGEN_SAFESTACKLAYOUT_H |