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e8b3966318
Currently, it prints the backward branch offset as unsigned value
like below:
7: 7d 34 0b 00 00 00 00 00 if r4 s>= r3 goto 11 <LBB0_3>
8: b7 00 00 00 00 00 00 00 r0 = 0
LBB0_2:
9: 07 00 00 00 01 00 00 00 r0 += 1
......
17: bf 31 00 00 00 00 00 00 r1 = r3
18: 6d 32 f6 ff 00 00 00 00 if r2 s> r3 goto 65526 <LBB0_3+0x7FFB0>
The correct print insn 18 should be:
18: 6d 32 f6 ff 00 00 00 00 if r2 s> r3 goto -10 <LBB0_2>
To provide better clarity and be consistent with kernel verifier output,
the insn 7 output is changed to the following with "+" added to
non-negative branch offset:
7: 7d 34 0b 00 00 00 00 00 if r4 s>= r3 goto +11 <LBB0_3>
Signed-off-by: Yonghong Song <yhs@fb.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
llvm-svn: 318442
110 lines
3.2 KiB
C++
110 lines
3.2 KiB
C++
//===-- BPFInstPrinter.cpp - Convert BPF MCInst to asm syntax -------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This class prints an BPF MCInst to a .s file.
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//
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//===----------------------------------------------------------------------===//
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#include "BPFInstPrinter.h"
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#include "BPF.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/FormattedStream.h"
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using namespace llvm;
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#define DEBUG_TYPE "asm-printer"
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// Include the auto-generated portion of the assembly writer.
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#include "BPFGenAsmWriter.inc"
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void BPFInstPrinter::printInst(const MCInst *MI, raw_ostream &O,
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StringRef Annot, const MCSubtargetInfo &STI) {
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printInstruction(MI, O);
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printAnnotation(O, Annot);
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}
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static void printExpr(const MCExpr *Expr, raw_ostream &O) {
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#ifndef NDEBUG
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const MCSymbolRefExpr *SRE;
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if (const MCBinaryExpr *BE = dyn_cast<MCBinaryExpr>(Expr))
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SRE = dyn_cast<MCSymbolRefExpr>(BE->getLHS());
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else
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SRE = dyn_cast<MCSymbolRefExpr>(Expr);
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assert(SRE && "Unexpected MCExpr type.");
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MCSymbolRefExpr::VariantKind Kind = SRE->getKind();
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assert(Kind == MCSymbolRefExpr::VK_None);
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#endif
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O << *Expr;
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}
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void BPFInstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
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raw_ostream &O, const char *Modifier) {
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assert((Modifier == 0 || Modifier[0] == 0) && "No modifiers supported");
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const MCOperand &Op = MI->getOperand(OpNo);
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if (Op.isReg()) {
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O << getRegisterName(Op.getReg());
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} else if (Op.isImm()) {
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O << (int32_t)Op.getImm();
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} else {
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assert(Op.isExpr() && "Expected an expression");
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printExpr(Op.getExpr(), O);
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}
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}
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void BPFInstPrinter::printMemOperand(const MCInst *MI, int OpNo, raw_ostream &O,
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const char *Modifier) {
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const MCOperand &RegOp = MI->getOperand(OpNo);
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const MCOperand &OffsetOp = MI->getOperand(OpNo + 1);
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// register
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assert(RegOp.isReg() && "Register operand not a register");
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O << getRegisterName(RegOp.getReg());
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// offset
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if (OffsetOp.isImm()) {
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auto Imm = OffsetOp.getImm();
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if (Imm >= 0)
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O << " + " << formatDec(Imm);
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else
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O << " - " << formatDec(-Imm);
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} else {
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assert(0 && "Expected an immediate");
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}
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}
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void BPFInstPrinter::printImm64Operand(const MCInst *MI, unsigned OpNo,
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raw_ostream &O) {
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const MCOperand &Op = MI->getOperand(OpNo);
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if (Op.isImm())
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O << (uint64_t)Op.getImm();
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else if (Op.isExpr())
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printExpr(Op.getExpr(), O);
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else
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O << Op;
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}
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void BPFInstPrinter::printBrTargetOperand(const MCInst *MI, unsigned OpNo,
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raw_ostream &O) {
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const MCOperand &Op = MI->getOperand(OpNo);
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if (Op.isImm()) {
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int16_t Imm = Op.getImm();
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O << ((Imm >= 0) ? "+" : "") << Imm;
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} else if (Op.isExpr()) {
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printExpr(Op.getExpr(), O);
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} else {
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O << Op;
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}
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}
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