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
|
//===--- CodeGenTypes.cpp - Type translation for LLVM CodeGen -------------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Chris Lattner and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This is the code that handles AST -> LLVM type lowering.
//
//===----------------------------------------------------------------------===//
#include "CodeGenTypes.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/AST/AST.h"
#include "llvm/DerivedTypes.h"
using namespace clang;
using namespace CodeGen;
CodeGenTypes::CodeGenTypes(ASTContext &Ctx)
: Context(Ctx), Target(Ctx.Target) {
}
/// ConvertType - Convert the specified type to its LLVM form.
const llvm::Type *CodeGenTypes::ConvertType(QualType T) {
// FIXME: Cache these, move the CodeGenModule, expand, etc.
const clang::Type &Ty = *T.getCanonicalType();
switch (Ty.getTypeClass()) {
case Type::Builtin: {
switch (cast<BuiltinType>(Ty).getKind()) {
case BuiltinType::Void:
// LLVM void type can only be used as the result of a function call. Just
// map to the same as char.
return llvm::IntegerType::get(8);
case BuiltinType::Bool:
// FIXME: This is very strange. We want scalars to be i1, but in memory
// they can be i1 or i32. Should the codegen handle this issue?
return llvm::Type::Int1Ty;
case BuiltinType::Char_S:
case BuiltinType::Char_U:
case BuiltinType::SChar:
case BuiltinType::UChar:
case BuiltinType::Short:
case BuiltinType::UShort:
case BuiltinType::Int:
case BuiltinType::UInt:
case BuiltinType::Long:
case BuiltinType::ULong:
case BuiltinType::LongLong:
case BuiltinType::ULongLong:
return llvm::IntegerType::get(Context.getTypeSize(T, SourceLocation()));
case BuiltinType::Float: return llvm::Type::FloatTy;
case BuiltinType::Double: return llvm::Type::DoubleTy;
case BuiltinType::LongDouble:
// FIXME: mapping long double onto double.
return llvm::Type::DoubleTy;
}
break;
}
case Type::Complex: {
std::vector<const llvm::Type*> Elts;
Elts.push_back(ConvertType(cast<ComplexType>(Ty).getElementType()));
Elts.push_back(Elts[0]);
return llvm::StructType::get(Elts);
}
case Type::Pointer: {
const PointerType &P = cast<PointerType>(Ty);
return llvm::PointerType::get(ConvertType(P.getPointeeType()));
}
case Type::Reference: {
const ReferenceType &R = cast<ReferenceType>(Ty);
return llvm::PointerType::get(ConvertType(R.getReferenceeType()));
}
case Type::Array: {
const ArrayType &A = cast<ArrayType>(Ty);
assert(A.getSizeModifier() == ArrayType::Normal &&
A.getIndexTypeQualifier() == 0 &&
"FIXME: We only handle trivial array types so far!");
llvm::APSInt Size(32);
if (A.getSizeExpr() &&
A.getSizeExpr()->isIntegerConstantExpr(Size, Context)) {
const llvm::Type *EltTy = ConvertType(A.getElementType());
return llvm::ArrayType::get(EltTy, Size.getZExtValue());
} else {
assert(0 && "FIXME: VLAs not implemented yet!");
}
}
case Type::OCUVector:
case Type::Vector: {
const VectorType &VT = cast<VectorType>(Ty);
return llvm::VectorType::get(ConvertType(VT.getElementType()),
VT.getNumElements());
}
case Type::FunctionNoProto:
case Type::FunctionProto: {
const FunctionType &FP = cast<FunctionType>(Ty);
const llvm::Type *ResultType;
if (FP.getResultType()->isVoidType())
ResultType = llvm::Type::VoidTy; // Result of function uses llvm void.
else
ResultType = ConvertType(FP.getResultType());
// FIXME: Convert argument types.
bool isVarArg;
std::vector<const llvm::Type*> ArgTys;
// Struct return passes the struct byref.
if (!ResultType->isFirstClassType() && ResultType != llvm::Type::VoidTy) {
ArgTys.push_back(llvm::PointerType::get(ResultType));
ResultType = llvm::Type::VoidTy;
}
if (const FunctionTypeProto *FTP = dyn_cast<FunctionTypeProto>(&FP)) {
DecodeArgumentTypes(*FTP, ArgTys);
isVarArg = FTP->isVariadic();
} else {
isVarArg = true;
}
return llvm::FunctionType::get(ResultType, ArgTys, isVarArg, 0);
}
case Type::TypeName:
case Type::Tagged:
break;
}
// FIXME: implement.
return llvm::OpaqueType::get();
}
void CodeGenTypes::DecodeArgumentTypes(const FunctionTypeProto &FTP,
std::vector<const llvm::Type*> &ArgTys) {
for (unsigned i = 0, e = FTP.getNumArgs(); i != e; ++i) {
const llvm::Type *Ty = ConvertType(FTP.getArgType(i));
if (Ty->isFirstClassType())
ArgTys.push_back(Ty);
else
ArgTys.push_back(llvm::PointerType::get(Ty));
}
}
|
