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
|
//===-- llvm/InlineAsm.h - Class to represent inline asm strings-*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This class represents the inline asm strings, which are Value*'s that are
// used as the callee operand of call instructions. InlineAsm's are uniqued
// like constants, and created via InlineAsm::get(...).
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_INLINEASM_H
#define LLVM_INLINEASM_H
#include "llvm/Value.h"
#include <vector>
namespace llvm {
class PointerType;
class FunctionType;
class Module;
class InlineAsm : public Value {
InlineAsm(const InlineAsm &); // do not implement
void operator=(const InlineAsm&); // do not implement
std::string AsmString, Constraints;
bool HasSideEffects;
bool IsAlignStack;
InlineAsm(const FunctionType *Ty, StringRef AsmString,
StringRef Constraints, bool hasSideEffects,
bool isAlignStack = false);
virtual ~InlineAsm();
public:
/// InlineAsm::get - Return the specified uniqued inline asm string.
///
static InlineAsm *get(const FunctionType *Ty, StringRef AsmString,
StringRef Constraints, bool hasSideEffects,
bool isAlignStack = false);
bool hasSideEffects() const { return HasSideEffects; }
bool isAlignStack() const { return IsAlignStack; }
/// getType - InlineAsm's are always pointers.
///
const PointerType *getType() const {
return reinterpret_cast<const PointerType*>(Value::getType());
}
/// getFunctionType - InlineAsm's are always pointers to functions.
///
const FunctionType *getFunctionType() const;
const std::string &getAsmString() const { return AsmString; }
const std::string &getConstraintString() const { return Constraints; }
/// Verify - This static method can be used by the parser to check to see if
/// the specified constraint string is legal for the type. This returns true
/// if legal, false if not.
///
static bool Verify(const FunctionType *Ty, StringRef Constraints);
// Constraint String Parsing
enum ConstraintPrefix {
isInput, // 'x'
isOutput, // '=x'
isClobber // '~x'
};
struct ConstraintInfo {
/// Type - The basic type of the constraint: input/output/clobber
///
ConstraintPrefix Type;
/// isEarlyClobber - "&": output operand writes result before inputs are all
/// read. This is only ever set for an output operand.
bool isEarlyClobber;
/// MatchingInput - If this is not -1, this is an output constraint where an
/// input constraint is required to match it (e.g. "0"). The value is the
/// constraint number that matches this one (for example, if this is
/// constraint #0 and constraint #4 has the value "0", this will be 4).
signed char MatchingInput;
/// hasMatchingInput - Return true if this is an output constraint that has
/// a matching input constraint.
bool hasMatchingInput() const { return MatchingInput != -1; }
/// isCommutative - This is set to true for a constraint that is commutative
/// with the next operand.
bool isCommutative;
/// isIndirect - True if this operand is an indirect operand. This means
/// that the address of the source or destination is present in the call
/// instruction, instead of it being returned or passed in explicitly. This
/// is represented with a '*' in the asm string.
bool isIndirect;
/// Code - The constraint code, either the register name (in braces) or the
/// constraint letter/number.
std::vector<std::string> Codes;
/// Parse - Analyze the specified string (e.g. "=*&{eax}") and fill in the
/// fields in this structure. If the constraint string is not understood,
/// return true, otherwise return false.
bool Parse(StringRef Str,
std::vector<InlineAsm::ConstraintInfo> &ConstraintsSoFar);
};
/// ParseConstraints - Split up the constraint string into the specific
/// constraints and their prefixes. If this returns an empty vector, and if
/// the constraint string itself isn't empty, there was an error parsing.
static std::vector<ConstraintInfo>
ParseConstraints(StringRef ConstraintString);
/// ParseConstraints - Parse the constraints of this inlineasm object,
/// returning them the same way that ParseConstraints(str) does.
std::vector<ConstraintInfo>
ParseConstraints() const {
return ParseConstraints(Constraints);
}
// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const InlineAsm *) { return true; }
static inline bool classof(const Value *V) {
return V->getValueID() == Value::InlineAsmVal;
}
/// getNumOperandRegisters - Extract the number of registers field from the
/// inline asm operand flag.
static unsigned getNumOperandRegisters(unsigned Flag) {
return (Flag & 0xffff) >> 3;
}
/// isUseOperandTiedToDef - Return true if the flag of the inline asm
/// operand indicates it is an use operand that's matched to a def operand.
static bool isUseOperandTiedToDef(unsigned Flag, unsigned &Idx) {
if ((Flag & 0x80000000) == 0)
return false;
Idx = (Flag & ~0x80000000) >> 16;
return true;
}
};
} // End llvm namespace
#endif
|
