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
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
|
//===--- SemaStmtAttr.cpp - Statement Attribute Handling ------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements stmt-related attribute processing.
//
//===----------------------------------------------------------------------===//
#include "clang/Sema/SemaInternal.h"
#include "clang/AST/ASTContext.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Sema/DelayedDiagnostic.h"
#include "clang/Sema/Lookup.h"
#include "clang/Sema/LoopHint.h"
#include "clang/Sema/ScopeInfo.h"
#include "llvm/ADT/StringExtras.h"
using namespace clang;
using namespace sema;
static Attr *handleFallThroughAttr(Sema &S, Stmt *St, const AttributeList &A,
SourceRange Range) {
if (!isa<NullStmt>(St)) {
S.Diag(A.getRange().getBegin(), diag::err_fallthrough_attr_wrong_target)
<< St->getLocStart();
if (isa<SwitchCase>(St)) {
SourceLocation L = S.getLocForEndOfToken(Range.getEnd());
S.Diag(L, diag::note_fallthrough_insert_semi_fixit)
<< FixItHint::CreateInsertion(L, ";");
}
return nullptr;
}
if (S.getCurFunction()->SwitchStack.empty()) {
S.Diag(A.getRange().getBegin(), diag::err_fallthrough_attr_outside_switch);
return nullptr;
}
return ::new (S.Context) FallThroughAttr(A.getRange(), S.Context,
A.getAttributeSpellingListIndex());
}
static Attr *handleLoopHintAttr(Sema &S, Stmt *St, const AttributeList &A,
SourceRange) {
if (St->getStmtClass() != Stmt::DoStmtClass &&
St->getStmtClass() != Stmt::ForStmtClass &&
St->getStmtClass() != Stmt::CXXForRangeStmtClass &&
St->getStmtClass() != Stmt::WhileStmtClass) {
S.Diag(St->getLocStart(), diag::err_pragma_loop_precedes_nonloop);
return nullptr;
}
IdentifierLoc *OptionLoc = A.getArgAsIdent(0);
IdentifierInfo *OptionInfo = OptionLoc->Ident;
IdentifierLoc *ValueLoc = A.getArgAsIdent(1);
IdentifierInfo *ValueInfo = ValueLoc->Ident;
Expr *ValueExpr = A.getArgAsExpr(2);
assert(OptionInfo && "Attribute must have valid option info.");
LoopHintAttr::OptionType Option =
llvm::StringSwitch<LoopHintAttr::OptionType>(OptionInfo->getNameStart())
.Case("vectorize", LoopHintAttr::Vectorize)
.Case("vectorize_width", LoopHintAttr::VectorizeWidth)
.Case("interleave", LoopHintAttr::Interleave)
.Case("interleave_count", LoopHintAttr::InterleaveCount)
.Default(LoopHintAttr::Vectorize);
int ValueInt;
if (Option == LoopHintAttr::Vectorize || Option == LoopHintAttr::Interleave) {
if (!ValueInfo) {
S.Diag(ValueLoc->Loc, diag::err_pragma_loop_invalid_keyword)
<< /*MissingKeyword=*/true << "";
return nullptr;
}
if (ValueInfo->isStr("disable"))
ValueInt = 0;
else if (ValueInfo->isStr("enable"))
ValueInt = 1;
else {
S.Diag(ValueLoc->Loc, diag::err_pragma_loop_invalid_keyword)
<< /*MissingKeyword=*/false << ValueInfo;
return nullptr;
}
} else if (Option == LoopHintAttr::VectorizeWidth ||
Option == LoopHintAttr::InterleaveCount) {
// FIXME: We should support template parameters for the loop hint value.
// See bug report #19610.
llvm::APSInt ValueAPS;
if (!ValueExpr || !ValueExpr->isIntegerConstantExpr(ValueAPS, S.Context)) {
S.Diag(ValueLoc->Loc, diag::err_pragma_loop_invalid_value)
<< /*MissingValue=*/true << "";
return nullptr;
}
if ((ValueInt = ValueAPS.getSExtValue()) < 1) {
S.Diag(ValueLoc->Loc, diag::err_pragma_loop_invalid_value)
<< /*MissingValue=*/false << ValueInt;
return nullptr;
}
} else
llvm_unreachable("Unknown loop hint option");
return LoopHintAttr::CreateImplicit(S.Context, Option, ValueInt,
A.getRange());
}
static void
CheckForIncompatibleAttributes(Sema &S, SmallVectorImpl<const Attr *> &Attrs) {
int PrevOptionValue[4] = {-1, -1, -1, -1};
int OptionId[4] = {LoopHintAttr::Vectorize, LoopHintAttr::VectorizeWidth,
LoopHintAttr::Interleave, LoopHintAttr::InterleaveCount};
for (const auto *I : Attrs) {
const LoopHintAttr *LH = dyn_cast<LoopHintAttr>(I);
// Skip non loop hint attributes
if (!LH)
continue;
int State, Value;
int Option = LH->getOption();
int ValueInt = LH->getValue();
switch (Option) {
case LoopHintAttr::Vectorize:
case LoopHintAttr::VectorizeWidth:
State = 0;
Value = 1;
break;
case LoopHintAttr::Interleave:
case LoopHintAttr::InterleaveCount:
State = 2;
Value = 3;
break;
}
SourceLocation ValueLoc = LH->getRange().getEnd();
// Compatibility testing is split into two cases.
// 1. if the current loop hint sets state (enable/disable) - check against
// previous state and value.
// 2. if the current loop hint sets a value - check against previous state
// and value.
if (Option == State) {
if (PrevOptionValue[State] != -1) {
// Cannot specify state twice.
int PrevValue = PrevOptionValue[State];
S.Diag(ValueLoc, diag::err_pragma_loop_compatibility)
<< /*Duplicate=*/true << LoopHintAttr::getOptionName(Option)
<< LoopHintAttr::getValueName(PrevValue)
<< LoopHintAttr::getOptionName(Option)
<< LoopHintAttr::getValueName(Value);
}
if (PrevOptionValue[Value] != -1) {
// Compare state with previous width/count.
int PrevOption = OptionId[Value];
int PrevValueInt = PrevOptionValue[Value];
if ((ValueInt == 0 && PrevValueInt > 1) ||
(ValueInt == 1 && PrevValueInt <= 1))
S.Diag(ValueLoc, diag::err_pragma_loop_compatibility)
<< /*Duplicate=*/false << LoopHintAttr::getOptionName(PrevOption)
<< PrevValueInt << LoopHintAttr::getOptionName(Option)
<< LoopHintAttr::getValueName(ValueInt);
}
} else {
if (PrevOptionValue[State] != -1) {
// Compare width/count value with previous state.
int PrevOption = OptionId[State];
int PrevValueInt = PrevOptionValue[State];
if ((ValueInt > 1 && PrevValueInt == 0) ||
(ValueInt <= 1 && PrevValueInt == 1))
S.Diag(ValueLoc, diag::err_pragma_loop_compatibility)
<< /*Duplicate=*/false << LoopHintAttr::getOptionName(PrevOption)
<< LoopHintAttr::getValueName(PrevValueInt)
<< LoopHintAttr::getOptionName(Option) << ValueInt;
}
if (PrevOptionValue[Value] != -1) {
// Cannot specify a width/count twice.
int PrevValueInt = PrevOptionValue[Value];
S.Diag(ValueLoc, diag::err_pragma_loop_compatibility)
<< /*Duplicate=*/true << LoopHintAttr::getOptionName(Option)
<< PrevValueInt << LoopHintAttr::getOptionName(Option) << ValueInt;
}
}
PrevOptionValue[Option] = ValueInt;
}
}
static Attr *ProcessStmtAttribute(Sema &S, Stmt *St, const AttributeList &A,
SourceRange Range) {
switch (A.getKind()) {
case AttributeList::UnknownAttribute:
S.Diag(A.getLoc(), A.isDeclspecAttribute() ?
diag::warn_unhandled_ms_attribute_ignored :
diag::warn_unknown_attribute_ignored) << A.getName();
return nullptr;
case AttributeList::AT_FallThrough:
return handleFallThroughAttr(S, St, A, Range);
case AttributeList::AT_LoopHint:
return handleLoopHintAttr(S, St, A, Range);
default:
// if we're here, then we parsed a known attribute, but didn't recognize
// it as a statement attribute => it is declaration attribute
S.Diag(A.getRange().getBegin(), diag::err_attribute_invalid_on_stmt)
<< A.getName() << St->getLocStart();
return nullptr;
}
}
StmtResult Sema::ProcessStmtAttributes(Stmt *S, AttributeList *AttrList,
SourceRange Range) {
SmallVector<const Attr*, 8> Attrs;
for (const AttributeList* l = AttrList; l; l = l->getNext()) {
if (Attr *a = ProcessStmtAttribute(*this, S, *l, Range))
Attrs.push_back(a);
}
CheckForIncompatibleAttributes(*this, Attrs);
if (Attrs.empty())
return S;
return ActOnAttributedStmt(Range.getBegin(), Attrs, S);
}
|
