/Users/buildslave/jenkins/workspace/clang-stage2-coverage-R/llvm/lib/CodeGen/SafeStackLayout.h
Line | Count | Source (jump to first uncovered line) |
1 | | //===- SafeStackLayout.h - SafeStack frame layout --------------*- C++ -*--===// |
2 | | // |
3 | | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
4 | | // See https://llvm.org/LICENSE.txt for license information. |
5 | | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
6 | | // |
7 | | //===----------------------------------------------------------------------===// |
8 | | |
9 | | #ifndef LLVM_LIB_CODEGEN_SAFESTACKLAYOUT_H |
10 | | #define LLVM_LIB_CODEGEN_SAFESTACKLAYOUT_H |
11 | | |
12 | | #include "SafeStackColoring.h" |
13 | | #include "llvm/ADT/DenseMap.h" |
14 | | #include "llvm/ADT/SmallVector.h" |
15 | | |
16 | | namespace llvm { |
17 | | |
18 | | class raw_ostream; |
19 | | class Value; |
20 | | |
21 | | namespace safestack { |
22 | | |
23 | | /// Compute the layout of an unsafe stack frame. |
24 | | class StackLayout { |
25 | | unsigned MaxAlignment; |
26 | | |
27 | | struct StackRegion { |
28 | | unsigned Start; |
29 | | unsigned End; |
30 | | StackColoring::LiveRange Range; |
31 | | |
32 | | StackRegion(unsigned Start, unsigned End, |
33 | | const StackColoring::LiveRange &Range) |
34 | 250 | : Start(Start), End(End), Range(Range) {} |
35 | | }; |
36 | | |
37 | | /// The list of current stack regions, sorted by StackRegion::Start. |
38 | | SmallVector<StackRegion, 16> Regions; |
39 | | |
40 | | struct StackObject { |
41 | | const Value *Handle; |
42 | | unsigned Size, Alignment; |
43 | | StackColoring::LiveRange Range; |
44 | | }; |
45 | | |
46 | | SmallVector<StackObject, 8> StackObjects; |
47 | | |
48 | | DenseMap<const Value *, unsigned> ObjectOffsets; |
49 | | DenseMap<const Value *, unsigned> ObjectAlignments; |
50 | | |
51 | | void layoutObject(StackObject &Obj); |
52 | | |
53 | | public: |
54 | 152 | StackLayout(unsigned StackAlignment) : MaxAlignment(StackAlignment) {} |
55 | | |
56 | | /// Add an object to the stack frame. Value pointer is opaque and used as a |
57 | | /// handle to retrieve the object's offset in the frame later. |
58 | | void addObject(const Value *V, unsigned Size, unsigned Alignment, |
59 | | const StackColoring::LiveRange &Range); |
60 | | |
61 | | /// Run the layout computation for all previously added objects. |
62 | | void computeLayout(); |
63 | | |
64 | | /// Returns the offset to the object start in the stack frame. |
65 | 252 | unsigned getObjectOffset(const Value *V) { return ObjectOffsets[V]; } |
66 | | |
67 | | /// Returns the alignment of the object |
68 | 7 | unsigned getObjectAlignment(const Value *V) { return ObjectAlignments[V]; } |
69 | | |
70 | | /// Returns the size of the entire frame. |
71 | 152 | unsigned getFrameSize() { return Regions.empty() ? 00 : Regions.back().End; } |
72 | | |
73 | | /// Returns the alignment of the frame. |
74 | 152 | unsigned getFrameAlignment() { return MaxAlignment; } |
75 | | |
76 | | void print(raw_ostream &OS); |
77 | | }; |
78 | | |
79 | | } // end namespace safestack |
80 | | |
81 | | } // end namespace llvm |
82 | | |
83 | | #endif // LLVM_LIB_CODEGEN_SAFESTACKLAYOUT_H |