clang 10.0.0git

Address.h
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1 //===-- Address.h - An aligned address -------------------------*- 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 // This class provides a simple wrapper for a pair of a pointer and an
10 // alignment.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #ifndef LLVM_CLANG_LIB_CODEGEN_ADDRESS_H
15 #define LLVM_CLANG_LIB_CODEGEN_ADDRESS_H
16
17 #include "llvm/IR/Constants.h"
18 #include "clang/AST/CharUnits.h"
19
20 namespace clang {
21 namespace CodeGen {
22
23 /// An aligned address.
24 class Address {
25 llvm::Value *Pointer;
26 CharUnits Alignment;
27 public:
28 Address(llvm::Value *pointer, CharUnits alignment)
29 : Pointer(pointer), Alignment(alignment) {
30 assert((!alignment.isZero() || pointer == nullptr) &&
31 "creating valid address with invalid alignment");
32 }
33
34 static Address invalid() { return Address(nullptr, CharUnits()); }
35 bool isValid() const { return Pointer != nullptr; }
36
37 llvm::Value *getPointer() const {
38 assert(isValid());
39 return Pointer;
40 }
41
42 /// Return the type of the pointer value.
43 llvm::PointerType *getType() const {
44 return llvm::cast<llvm::PointerType>(getPointer()->getType());
45 }
46
47 /// Return the type of the values stored in this address.
48 ///
49 /// When IR pointer types lose their element type, we should simply
50 /// store it in Address instead for the convenience of writing code.
51 llvm::Type *getElementType() const {
52 return getType()->getElementType();
53 }
54
55 /// Return the address space that this address resides in.
56 unsigned getAddressSpace() const {
57 return getType()->getAddressSpace();
58 }
59
60 /// Return the IR name of the pointer value.
61 llvm::StringRef getName() const {
62 return getPointer()->getName();
63 }
64
65 /// Return the alignment of this pointer.
66 CharUnits getAlignment() const {
67 assert(isValid());
68 return Alignment;
69 }
70 };
71
72 /// A specialization of Address that requires the address to be an
73 /// LLVM Constant.
74 class ConstantAddress : public Address {
75 public:
76 ConstantAddress(llvm::Constant *pointer, CharUnits alignment)
77 : Address(pointer, alignment) {}
78
79 static ConstantAddress invalid() {
80 return ConstantAddress(nullptr, CharUnits());
81 }
82
83 llvm::Constant *getPointer() const {
84 return llvm::cast<llvm::Constant>(Address::getPointer());
85 }
86
87 ConstantAddress getBitCast(llvm::Type *ty) const {
88 return ConstantAddress(llvm::ConstantExpr::getBitCast(getPointer(), ty),
89 getAlignment());
90 }
91
92 ConstantAddress getElementBitCast(llvm::Type *ty) const {
93 return getBitCast(ty->getPointerTo(getAddressSpace()));
94 }
95
96 static bool isaImpl(Address addr) {
97 return llvm::isa<llvm::Constant>(addr.getPointer());
98 }
99 static ConstantAddress castImpl(Address addr) {
100 return ConstantAddress(llvm::cast<llvm::Constant>(addr.getPointer()),
101 addr.getAlignment());
102 }
103 };
104
105 }
106
107 // Present a minimal LLVM-like casting interface.
108 template <class U> inline U cast(CodeGen::Address addr) {
109 return U::castImpl(addr);
110 }
111 template <class U> inline bool isa(CodeGen::Address addr) {
112 return U::isaImpl(addr);
113 }
114
115 }
116
117 #endif
clang::CodeGen::ConstantAddress::ConstantAddress
ConstantAddress(llvm::Constant *pointer, CharUnits alignment)
Definition: Address.h:76
clang::CharUnits::isZero
bool isZero() const
isZero - Test whether the quantity equals zero.
Definition: CharUnits.h:116
Value
Value
Definition: UninitializedValues.cpp:101
clang::CodeGen::Address::getPointer
llvm::Value * getPointer() const
Definition: Address.h:37
clang::CodeGen::Address::getAddressSpace
unsigned getAddressSpace() const
Return the address space that this address resides in.
Definition: Address.h:56
clang::CodeGen::ConstantAddress::isaImpl
static bool isaImpl(Address addr)
Definition: Address.h:96
CharUnits.h
clang::CharUnits
CharUnits - This is an opaque type for sizes expressed in character units.
Definition: CharUnits.h:38
clang::CodeGen::Address::getAlignment
CharUnits getAlignment() const
Return the alignment of this pointer.
Definition: Address.h:66
clang::CodeGen::Address::isValid
bool isValid() const
Definition: Address.h:35
clang::CodeGen::ConstantAddress::getElementBitCast
ConstantAddress getElementBitCast(llvm::Type *ty) const
Definition: Address.h:92
clang::CodeGen::ConstantAddress::castImpl
static ConstantAddress castImpl(Address addr)
Definition: Address.h:99
clang::CodeGen::Address::invalid
static Address invalid()
Definition: Address.h:34
clang::CodeGen::Address::getType
llvm::PointerType * getType() const
Return the type of the pointer value.
Definition: Address.h:43
clang::isa
bool isa(CodeGen::Address addr)
Definition: Address.h:111
clang::CodeGen::Address::Address
Address(llvm::Value *pointer, CharUnits alignment)
Definition: Address.h:28
clang::CodeGen::AlignmentSource::Type
The l-value was considered opaque, so the alignment was determined from a type.
clang::CodeGen::ConstantAddress::getBitCast
ConstantAddress getBitCast(llvm::Type *ty) const
Definition: Address.h:87
clang::CodeGen::Address
An aligned address.
Definition: Address.h:24
clang
Dataflow Directional Tag Classes.
Definition: CFGReachabilityAnalysis.h:21
clang::CodeGen::ConstantAddress::getPointer
llvm::Constant * getPointer() const
Definition: Address.h:83
clang::cast
U cast(CodeGen::Address addr)
Definition: Address.h:108
clang::CodeGen::Address::getElementType
llvm::Type * getElementType() const
Return the type of the values stored in this address.
Definition: Address.h:51
clang::CodeGen::Address::getName
llvm::StringRef getName() const
Return the IR name of the pointer value.
Definition: Address.h:61
clang::CodeGen::ConstantAddress
A specialization of Address that requires the address to be an LLVM Constant.
Definition: Address.h:74
clang::CodeGen::ConstantAddress::invalid
static ConstantAddress invalid()
Definition: Address.h:79