1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
//===- EHPersonalities.cpp - Compute EH-related information ---------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/EHPersonalities.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/IR/CFG.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Instructions.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
/// See if the given exception handling personality function is one that we
/// understand. If so, return a description of it; otherwise return Unknown.
EHPersonality llvm::classifyEHPersonality(const Value *Pers) {
const GlobalValue *F =
Pers ? dyn_cast<GlobalValue>(Pers->stripPointerCasts()) : nullptr;
if (!F || !F->getValueType() || !F->getValueType()->isFunctionTy())
return EHPersonality::Unknown;
return StringSwitch<EHPersonality>(F->getName())
.Case("__gnat_eh_personality", EHPersonality::GNU_Ada)
.Case("__gxx_personality_v0", EHPersonality::GNU_CXX)
.Case("__gxx_personality_seh0", EHPersonality::GNU_CXX)
.Case("__gxx_personality_sj0", EHPersonality::GNU_CXX_SjLj)
.Case("__gcc_personality_v0", EHPersonality::GNU_C)
.Case("__gcc_personality_seh0", EHPersonality::GNU_C)
.Case("__gcc_personality_sj0", EHPersonality::GNU_C_SjLj)
.Case("__objc_personality_v0", EHPersonality::GNU_ObjC)
.Case("_except_handler3", EHPersonality::MSVC_X86SEH)
.Case("_except_handler4", EHPersonality::MSVC_X86SEH)
.Case("__C_specific_handler", EHPersonality::MSVC_TableSEH)
.Case("__CxxFrameHandler3", EHPersonality::MSVC_CXX)
.Case("ProcessCLRException", EHPersonality::CoreCLR)
.Case("rust_eh_personality", EHPersonality::Rust)
.Case("__gxx_wasm_personality_v0", EHPersonality::Wasm_CXX)
.Case("__xlcxx_personality_v1", EHPersonality::XL_CXX)
.Default(EHPersonality::Unknown);
}
StringRef llvm::getEHPersonalityName(EHPersonality Pers) {
switch (Pers) {
case EHPersonality::GNU_Ada: return "__gnat_eh_personality";
case EHPersonality::GNU_CXX: return "__gxx_personality_v0";
case EHPersonality::GNU_CXX_SjLj: return "__gxx_personality_sj0";
case EHPersonality::GNU_C: return "__gcc_personality_v0";
case EHPersonality::GNU_C_SjLj: return "__gcc_personality_sj0";
case EHPersonality::GNU_ObjC: return "__objc_personality_v0";
case EHPersonality::MSVC_X86SEH: return "_except_handler3";
case EHPersonality::MSVC_TableSEH:
return "__C_specific_handler";
case EHPersonality::MSVC_CXX: return "__CxxFrameHandler3";
case EHPersonality::CoreCLR: return "ProcessCLRException";
case EHPersonality::Rust: return "rust_eh_personality";
case EHPersonality::Wasm_CXX: return "__gxx_wasm_personality_v0";
case EHPersonality::XL_CXX:
return "__xlcxx_personality_v1";
case EHPersonality::Unknown: llvm_unreachable("Unknown EHPersonality!");
}
llvm_unreachable("Invalid EHPersonality!");
}
EHPersonality llvm::getDefaultEHPersonality(const Triple &T) {
return EHPersonality::GNU_C;
}
bool llvm::canSimplifyInvokeNoUnwind(const Function *F) {
EHPersonality Personality = classifyEHPersonality(F->getPersonalityFn());
// We can't simplify any invokes to nounwind functions if the personality
// function wants to catch asynch exceptions. The nounwind attribute only
// implies that the function does not throw synchronous exceptions.
return !isAsynchronousEHPersonality(Personality);
}
DenseMap<BasicBlock *, ColorVector> llvm::colorEHFunclets(Function &F) {
SmallVector<std::pair<BasicBlock *, BasicBlock *>, 16> Worklist;
BasicBlock *EntryBlock = &F.getEntryBlock();
DenseMap<BasicBlock *, ColorVector> BlockColors;
// Build up the color map, which maps each block to its set of 'colors'.
// For any block B the "colors" of B are the set of funclets F (possibly
// including a root "funclet" representing the main function) such that
// F will need to directly contain B or a copy of B (where the term "directly
// contain" is used to distinguish from being "transitively contained" in
// a nested funclet).
//
// Note: Despite not being a funclet in the truest sense, a catchswitch is
// considered to belong to its own funclet for the purposes of coloring.
DEBUG_WITH_TYPE("winehprepare-coloring", dbgs() << "\nColoring funclets for "
<< F.getName() << "\n");
Worklist.push_back({EntryBlock, EntryBlock});
while (!Worklist.empty()) {
BasicBlock *Visiting;
BasicBlock *Color;
std::tie(Visiting, Color) = Worklist.pop_back_val();
DEBUG_WITH_TYPE("winehprepare-coloring",
dbgs() << "Visiting " << Visiting->getName() << ", "
<< Color->getName() << "\n");
Instruction *VisitingHead = Visiting->getFirstNonPHI();
if (VisitingHead->isEHPad()) {
// Mark this funclet head as a member of itself.
Color = Visiting;
}
// Note that this is a member of the given color.
ColorVector &Colors = BlockColors[Visiting];
if (!is_contained(Colors, Color))
Colors.push_back(Color);
else
continue;
DEBUG_WITH_TYPE("winehprepare-coloring",
dbgs() << " Assigned color \'" << Color->getName()
<< "\' to block \'" << Visiting->getName()
<< "\'.\n");
BasicBlock *SuccColor = Color;
Instruction *Terminator = Visiting->getTerminator();
if (auto *CatchRet = dyn_cast<CatchReturnInst>(Terminator)) {
Value *ParentPad = CatchRet->getCatchSwitchParentPad();
if (isa<ConstantTokenNone>(ParentPad))
SuccColor = EntryBlock;
else
SuccColor = cast<Instruction>(ParentPad)->getParent();
}
for (BasicBlock *Succ : successors(Visiting))
Worklist.push_back({Succ, SuccColor});
}
return BlockColors;
}
|
