forked from OSchip/llvm-project
95 lines
2.8 KiB
C++
95 lines
2.8 KiB
C++
//===-- BPFInstPrinter.cpp - Convert BPF MCInst to asm syntax -------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This class prints an BPF MCInst to a .s file.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "BPF.h"
|
|
#include "BPFInstPrinter.h"
|
|
#include "llvm/MC/MCAsmInfo.h"
|
|
#include "llvm/MC/MCExpr.h"
|
|
#include "llvm/MC/MCInst.h"
|
|
#include "llvm/MC/MCSymbol.h"
|
|
#include "llvm/Support/ErrorHandling.h"
|
|
#include "llvm/Support/FormattedStream.h"
|
|
using namespace llvm;
|
|
|
|
#define DEBUG_TYPE "asm-printer"
|
|
|
|
// Include the auto-generated portion of the assembly writer.
|
|
#include "BPFGenAsmWriter.inc"
|
|
|
|
void BPFInstPrinter::printInst(const MCInst *MI, raw_ostream &O,
|
|
StringRef Annot, const MCSubtargetInfo &STI) {
|
|
printInstruction(MI, O);
|
|
printAnnotation(O, Annot);
|
|
}
|
|
|
|
static void printExpr(const MCExpr *Expr, raw_ostream &O) {
|
|
#ifndef NDEBUG
|
|
const MCSymbolRefExpr *SRE;
|
|
|
|
if (const MCBinaryExpr *BE = dyn_cast<MCBinaryExpr>(Expr))
|
|
SRE = dyn_cast<MCSymbolRefExpr>(BE->getLHS());
|
|
else
|
|
SRE = dyn_cast<MCSymbolRefExpr>(Expr);
|
|
assert(SRE && "Unexpected MCExpr type.");
|
|
|
|
MCSymbolRefExpr::VariantKind Kind = SRE->getKind();
|
|
|
|
assert(Kind == MCSymbolRefExpr::VK_None);
|
|
#endif
|
|
O << *Expr;
|
|
}
|
|
|
|
void BPFInstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
|
|
raw_ostream &O, const char *Modifier) {
|
|
assert((Modifier == 0 || Modifier[0] == 0) && "No modifiers supported");
|
|
const MCOperand &Op = MI->getOperand(OpNo);
|
|
if (Op.isReg()) {
|
|
O << getRegisterName(Op.getReg());
|
|
} else if (Op.isImm()) {
|
|
O << (int32_t)Op.getImm();
|
|
} else {
|
|
assert(Op.isExpr() && "Expected an expression");
|
|
printExpr(Op.getExpr(), O);
|
|
}
|
|
}
|
|
|
|
void BPFInstPrinter::printMemOperand(const MCInst *MI, int OpNo, raw_ostream &O,
|
|
const char *Modifier) {
|
|
const MCOperand &RegOp = MI->getOperand(OpNo);
|
|
const MCOperand &OffsetOp = MI->getOperand(OpNo + 1);
|
|
|
|
// register
|
|
assert(RegOp.isReg() && "Register operand not a register");
|
|
O << getRegisterName(RegOp.getReg());
|
|
|
|
// offset
|
|
if (OffsetOp.isImm()) {
|
|
auto Imm = OffsetOp.getImm();
|
|
if (Imm >= 0)
|
|
O << " + " << formatDec(Imm);
|
|
else
|
|
O << " - " << formatDec(-Imm);
|
|
} else {
|
|
assert(0 && "Expected an immediate");
|
|
}
|
|
}
|
|
|
|
void BPFInstPrinter::printImm64Operand(const MCInst *MI, unsigned OpNo,
|
|
raw_ostream &O) {
|
|
const MCOperand &Op = MI->getOperand(OpNo);
|
|
if (Op.isImm())
|
|
O << (uint64_t)Op.getImm();
|
|
else
|
|
O << Op;
|
|
}
|