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Add MC instruction printer support for ARM and Thumb1 jump tables.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@114555 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1385,6 +1385,47 @@ static MCSymbol *getPICLabel(const char *Prefix, unsigned FunctionNumber,
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return Label;
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}
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void ARMAsmPrinter::EmitJumpTable(const MachineInstr *MI) {
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unsigned Opcode = MI->getOpcode();
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int OpNum = 1;
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if (Opcode == ARM::BR_JTadd)
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OpNum = 2;
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else if (Opcode == ARM::BR_JTm)
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OpNum = 3;
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const MachineOperand &MO1 = MI->getOperand(OpNum);
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const MachineOperand &MO2 = MI->getOperand(OpNum+1); // Unique Id
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unsigned JTI = MO1.getIndex();
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// Emit a label for the jump table.
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MCSymbol *JTISymbol = GetARMJTIPICJumpTableLabel2(JTI, MO2.getImm());
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OutStreamer.EmitLabel(JTISymbol);
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// Emit each entry of the table.
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const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
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const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
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const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
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for (unsigned i = 0, e = JTBBs.size(); i != e; ++i) {
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MachineBasicBlock *MBB = JTBBs[i];
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// Construct an MCExpr for the entry. We want a value of the form:
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// (BasicBlockAddr - TableBeginAddr)
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//
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// For example, a table with entries jumping to basic blocks BB0 and BB1
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// would look like:
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// LJTI_0_0:
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// .word (LBB0 - LJTI_0_0)
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// .word (LBB1 - LJTI_0_0)
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const MCExpr *Expr = MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext);
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if (TM.getRelocationModel() == Reloc::PIC_)
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Expr = MCBinaryExpr::CreateSub(Expr, MCSymbolRefExpr::Create(JTISymbol,
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OutContext),
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OutContext);
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OutStreamer.EmitValue(Expr, 4);
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}
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}
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void ARMAsmPrinter::EmitJump2Table(const MachineInstr *MI) {
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unsigned Opcode = MI->getOpcode();
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int OpNum = (Opcode == ARM::t2BR_JT) ? 2 : 1;
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@ -1664,9 +1705,14 @@ void ARMAsmPrinter::printInstructionThroughMCStreamer(const MachineInstr *MI) {
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case ARM::tBR_JTr:
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case ARM::BR_JTr:
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case ARM::BR_JTm:
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case ARM::BR_JTadd:
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abort();
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break;
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case ARM::BR_JTadd: {
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// Lower and emit the instruction itself, then the jump table following it.
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MCInst TmpInst;
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MCInstLowering.Lower(MI, TmpInst);
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OutStreamer.EmitInstruction(TmpInst);
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EmitJumpTable(MI);
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return;
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}
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}
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MCInst TmpInst;
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