LLVM 17.0.0git
MSP430InstPrinter.cpp
Go to the documentation of this file.
1//===-- MSP430InstPrinter.cpp - Convert MSP430 MCInst to assembly syntax --===//
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 prints an MSP430 MCInst to a .s file.
10//
11//===----------------------------------------------------------------------===//
12
13#include "MSP430InstPrinter.h"
14#include "MSP430.h"
15#include "llvm/MC/MCAsmInfo.h"
16#include "llvm/MC/MCExpr.h"
17#include "llvm/MC/MCInst.h"
18#include "llvm/MC/MCInstrInfo.h"
21using namespace llvm;
22
23#define DEBUG_TYPE "asm-printer"
24
25// Include the auto-generated portion of the assembly writer.
26#define PRINT_ALIAS_INSTR
27#include "MSP430GenAsmWriter.inc"
28
30 StringRef Annot, const MCSubtargetInfo &STI,
31 raw_ostream &O) {
32 if (!printAliasInstr(MI, Address, O))
34 printAnnotation(O, Annot);
35}
36
37void MSP430InstPrinter::printPCRelImmOperand(const MCInst *MI, unsigned OpNo,
38 raw_ostream &O) {
39 const MCOperand &Op = MI->getOperand(OpNo);
40 if (Op.isImm()) {
41 int64_t Imm = Op.getImm() * 2 + 2;
42 O << "$";
43 if (Imm >= 0)
44 O << '+';
45 O << Imm;
46 } else {
47 assert(Op.isExpr() && "unknown pcrel immediate operand");
48 Op.getExpr()->print(O, &MAI);
49 }
50}
51
52void MSP430InstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
53 raw_ostream &O, const char *Modifier) {
54 assert((Modifier == nullptr || Modifier[0] == 0) && "No modifiers supported");
55 const MCOperand &Op = MI->getOperand(OpNo);
56 if (Op.isReg()) {
57 O << getRegisterName(Op.getReg());
58 } else if (Op.isImm()) {
59 O << '#' << Op.getImm();
60 } else {
61 assert(Op.isExpr() && "unknown operand kind in printOperand");
62 O << '#';
63 Op.getExpr()->print(O, &MAI);
64 }
65}
66
67void MSP430InstPrinter::printSrcMemOperand(const MCInst *MI, unsigned OpNo,
68 raw_ostream &O,
69 const char *Modifier) {
70 const MCOperand &Base = MI->getOperand(OpNo);
71 const MCOperand &Disp = MI->getOperand(OpNo+1);
72
73 // Print displacement first
74
75 // If the global address expression is a part of displacement field with a
76 // register base, we should not emit any prefix symbol here, e.g.
77 // mov.w &foo, r1
78 // vs
79 // mov.w glb(r1), r2
80 // Otherwise (!) msp430-as will silently miscompile the output :(
81 if (Base.getReg() == MSP430::SR)
82 O << '&';
83
84 if (Disp.isExpr())
85 Disp.getExpr()->print(O, &MAI);
86 else {
87 assert(Disp.isImm() && "Expected immediate in displacement field");
88 O << Disp.getImm();
89 }
90
91 // Print register base field
92 if ((Base.getReg() != MSP430::SR) &&
93 (Base.getReg() != MSP430::PC))
94 O << '(' << getRegisterName(Base.getReg()) << ')';
95}
96
97void MSP430InstPrinter::printIndRegOperand(const MCInst *MI, unsigned OpNo,
98 raw_ostream &O) {
99 const MCOperand &Base = MI->getOperand(OpNo);
100 O << "@" << getRegisterName(Base.getReg());
101}
102
103void MSP430InstPrinter::printPostIndRegOperand(const MCInst *MI, unsigned OpNo,
104 raw_ostream &O) {
105 const MCOperand &Base = MI->getOperand(OpNo);
106 O << "@" << getRegisterName(Base.getReg()) << "+";
107}
108
109void MSP430InstPrinter::printCCOperand(const MCInst *MI, unsigned OpNo,
110 raw_ostream &O) {
111 unsigned CC = MI->getOperand(OpNo).getImm();
112
113 switch (CC) {
114 default:
115 llvm_unreachable("Unsupported CC code");
116 case MSP430CC::COND_E:
117 O << "eq";
118 break;
120 O << "ne";
121 break;
123 O << "hs";
124 break;
126 O << "lo";
127 break;
129 O << "ge";
130 break;
131 case MSP430CC::COND_L:
132 O << 'l';
133 break;
134 case MSP430CC::COND_N:
135 O << 'n';
136 break;
137 }
138}
IRTranslator LLVM IR MI
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
void print(raw_ostream &OS, const MCAsmInfo *MAI, bool InParens=false) const
Definition: MCExpr.cpp:41
void printAnnotation(raw_ostream &OS, StringRef Annot)
Utility function for printing annotations.
const MCAsmInfo & MAI
Definition: MCInstPrinter.h:50
Instances of this class represent a single low-level machine instruction.
Definition: MCInst.h:184
Instances of this class represent operands of the MCInst class.
Definition: MCInst.h:36
int64_t getImm() const
Definition: MCInst.h:80
bool isImm() const
Definition: MCInst.h:62
const MCExpr * getExpr() const
Definition: MCInst.h:114
bool isExpr() const
Definition: MCInst.h:65
Generic base class for all target subtargets.
static const char * getRegisterName(MCRegister Reg)
void printInst(const MCInst *MI, uint64_t Address, StringRef Annot, const MCSubtargetInfo &STI, raw_ostream &O) override
Print the specified MCInst to the specified raw_ostream.
void printInstruction(const MCInst *MI, uint64_t Address, raw_ostream &O)
bool printAliasInstr(const MCInst *MI, uint64_t Address, raw_ostream &O)
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:50
This class implements an extremely fast bulk output stream that can only output to a stream.
Definition: raw_ostream.h:52
#define llvm_unreachable(msg)
Marks that the current location is not supposed to be reachable.
@ COND_LO
Definition: MSP430.h:26
@ COND_N
Definition: MSP430.h:29
@ COND_L
Definition: MSP430.h:28
@ COND_E
Definition: MSP430.h:23
@ COND_GE
Definition: MSP430.h:27
@ COND_NE
Definition: MSP430.h:24
@ COND_HS
Definition: MSP430.h:25
This is an optimization pass for GlobalISel generic memory operations.
Definition: AddressRanges.h:18