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
140
141
142
143
144
145
146
147
148
| //===--- Context.cpp - Context for the constexpr VM -------------*- C++ -*-===//
//
// 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 "Context.h"
#include "ByteCodeEmitter.h"
#include "ByteCodeExprGen.h"
#include "ByteCodeStmtGen.h"
#include "EvalEmitter.h"
#include "Interp.h"
#include "InterpFrame.h"
#include "InterpStack.h"
#include "PrimType.h"
#include "Program.h"
#include "clang/AST/Expr.h"
using namespace clang;
using namespace clang::interp;
Context::Context(ASTContext &Ctx)
: Ctx(Ctx), ForceInterp(getLangOpts().ForceNewConstInterp),
P(new Program(*this)) {}
Context::~Context() {}
InterpResult Context::isPotentialConstantExpr(State &Parent,
const FunctionDecl *FD) {
Function *Func = P->getFunction(FD);
if (!Func) {
if (auto R = ByteCodeStmtGen<ByteCodeEmitter>(*this, *P).compileFunc(FD)) {
Func = *R;
} else if (ForceInterp) {
handleAllErrors(R.takeError(), [&Parent](ByteCodeGenError &Err) {
Parent.FFDiag(Err.getLoc(), diag::err_experimental_clang_interp_failed);
});
return InterpResult::Fail;
} else {
consumeError(R.takeError());
return InterpResult::Bail;
}
}
if (!Func->isConstexpr())
return InterpResult::Fail;
APValue Dummy;
return Run(Parent, Func, Dummy);
}
InterpResult Context::evaluateAsRValue(State &Parent, const Expr *E,
APValue &Result) {
ByteCodeExprGen<EvalEmitter> C(*this, *P, Parent, Stk, Result);
return Check(Parent, C.interpretExpr(E));
}
InterpResult Context::evaluateAsInitializer(State &Parent, const VarDecl *VD,
APValue &Result) {
ByteCodeExprGen<EvalEmitter> C(*this, *P, Parent, Stk, Result);
return Check(Parent, C.interpretDecl(VD));
}
const LangOptions &Context::getLangOpts() const { return Ctx.getLangOpts(); }
llvm::Optional<PrimType> Context::classify(QualType T) {
if (T->isReferenceType() || T->isPointerType()) {
return PT_Ptr;
}
if (T->isBooleanType())
return PT_Bool;
if (T->isSignedIntegerOrEnumerationType()) {
switch (Ctx.getIntWidth(T)) {
case 64:
return PT_Sint64;
case 32:
return PT_Sint32;
case 16:
return PT_Sint16;
case 8:
return PT_Sint8;
default:
return {};
}
}
if (T->isUnsignedIntegerOrEnumerationType()) {
switch (Ctx.getIntWidth(T)) {
case 64:
return PT_Uint64;
case 32:
return PT_Uint32;
case 16:
return PT_Uint16;
case 8:
return PT_Uint8;
default:
return {};
}
}
if (T->isNullPtrType())
return PT_Ptr;
if (auto *AT = dyn_cast<AtomicType>(T))
return classify(AT->getValueType());
return {};
}
unsigned Context::getCharBit() const {
return Ctx.getTargetInfo().getCharWidth();
}
InterpResult Context::Run(State &Parent, Function *Func, APValue &Result) {
InterpResult Flag;
{
InterpState State(Parent, *P, Stk, *this);
State.Current = new InterpFrame(State, Func, nullptr, {}, {});
if (Interpret(State, Result)) {
Flag = InterpResult::Success;
} else {
Flag = InterpResult::Fail;
}
}
if (Flag != InterpResult::Success)
Stk.clear();
return Flag;
}
InterpResult Context::Check(State &Parent, llvm::Expected<bool> &&R) {
if (R) {
return *R ? InterpResult::Success : InterpResult::Fail;
} else if (ForceInterp) {
handleAllErrors(R.takeError(), [&Parent](ByteCodeGenError &Err) {
Parent.FFDiag(Err.getLoc(), diag::err_experimental_clang_interp_failed);
});
return InterpResult::Fail;
} else {
consumeError(R.takeError());
return InterpResult::Bail;
}
}
|