blob: ac67c6efabb7a5d635d97620bce15210ddebc32d (
plain)
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
|
//===-- ARMUnwindOpAsm.h - ARM Unwind Opcodes Assembler ---------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares the unwind opcode assmebler for ARM exception handling
// table.
//
//===----------------------------------------------------------------------===//
#ifndef ARM_UNWIND_OP_ASM_H
#define ARM_UNWIND_OP_ASM_H
#include "ARMUnwindOp.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/DataTypes.h"
namespace llvm {
class MCSymbol;
class UnwindOpcodeAssembler {
private:
llvm::SmallVector<uint8_t, 32> Ops;
llvm::SmallVector<unsigned, 8> OpBegins;
bool HasPersonality;
public:
UnwindOpcodeAssembler()
: HasPersonality(0) {
OpBegins.push_back(0);
}
/// Reset the unwind opcode assembler.
void Reset() {
Ops.clear();
OpBegins.clear();
OpBegins.push_back(0);
HasPersonality = 0;
}
/// Set the personality index
void setPersonality(const MCSymbol *Per) {
HasPersonality = 1;
}
/// Emit unwind opcodes for .save directives
void EmitRegSave(uint32_t RegSave);
/// Emit unwind opcodes for .vsave directives
void EmitVFPRegSave(uint32_t VFPRegSave);
/// Emit unwind opcodes to copy address from source register to $sp.
void EmitSetSP(uint16_t Reg);
/// Emit unwind opcodes to add $sp with an offset.
void EmitSPOffset(int64_t Offset);
/// Finalize the unwind opcode sequence for EmitBytes()
void Finalize(unsigned &PersonalityIndex,
SmallVectorImpl<uint8_t> &Result);
private:
void EmitInt8(unsigned Opcode) {
Ops.push_back(Opcode & 0xff);
OpBegins.push_back(OpBegins.back() + 1);
}
void EmitInt16(unsigned Opcode) {
Ops.push_back((Opcode >> 8) & 0xff);
Ops.push_back(Opcode & 0xff);
OpBegins.push_back(OpBegins.back() + 2);
}
void EmitBytes(const uint8_t *Opcode, size_t Size) {
Ops.insert(Ops.end(), Opcode, Opcode + Size);
OpBegins.push_back(OpBegins.back() + Size);
}
};
} // namespace llvm
#endif // ARM_UNWIND_OP_ASM_H
|