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Add support for referencing global variables/functions
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4907 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -133,8 +133,14 @@ namespace {
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// If this operand is a constant, emit the code to copy the constant into
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// the register here...
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//
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if (Constant *C = dyn_cast<Constant>(V))
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if (Constant *C = dyn_cast<Constant>(V)) {
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copyConstantToRegister(C, Reg);
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} else if (GlobalValue *GV = dyn_cast<GlobalValue>(V)) {
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// Move the address of the global into the register
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BuildMI(BB, X86::MOVir32, 1, Reg).addReg(GV);
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} else {
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assert(0 && "Don't know how to handle a value of this type!");
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}
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return Reg;
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}
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@ -11,6 +11,7 @@
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#include "llvm/CodeGen/MachineCodeEmitter.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/Value.h"
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namespace {
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class Emitter : public FunctionPass {
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@ -224,7 +225,12 @@ void Emitter::emitInstruction(MachineInstr &MI) {
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MCE.emitByte(BaseOpcode + getX86RegNum(MI.getOperand(0).getReg()));
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if (MI.getNumOperands() == 2) {
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unsigned Size = 4;
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emitConstant(MI.getOperand(1).getImmedValue(), Size);
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if (Value *V = MI.getOperand(1).getVRegValue()) {
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assert(Size == 4 && "Don't know how to emit non-pointer values!");
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MCE.emitGlobalAddress(cast<GlobalValue>(V));
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} else {
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emitConstant(MI.getOperand(1).getImmedValue(), Size);
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}
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}
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break;
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case X86II::MRMDestReg:
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@ -96,6 +96,10 @@ static void printOp(std::ostream &O, const MachineOperand &MO,
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const MRegisterInfo &RI) {
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switch (MO.getType()) {
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case MachineOperand::MO_VirtualRegister:
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if (Value *V = MO.getVRegValue()) {
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O << "<" << V->getName() << ">";
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return;
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}
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case MachineOperand::MO_MachineRegister:
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if (MO.getReg() < MRegisterInfo::FirstVirtualRegister)
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O << RI.get(MO.getReg()).Name;
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@ -172,11 +176,15 @@ void X86InstrInfo::print(const MachineInstr *MI, std::ostream &O,
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// There are currently two forms of acceptable AddRegFrm instructions.
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// Either the instruction JUST takes a single register (like inc, dec, etc),
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// or it takes a register and an immediate of the same size as the register
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// (move immediate f.e.).
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// (move immediate f.e.). Note that this immediate value might be stored as
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// an LLVM value, to represent, for example, loading the address of a global
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// into a register.
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//
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assert(isReg(MI->getOperand(0)) &&
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(MI->getNumOperands() == 1 ||
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(MI->getNumOperands() == 2 && isImmediate(MI->getOperand(1)))) &&
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(MI->getNumOperands() == 2 &&
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(MI->getOperand(1).getVRegValue() ||
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isImmediate(MI->getOperand(1))))) &&
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"Illegal form for AddRegFrm instruction!");
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unsigned Reg = MI->getOperand(0).getReg();
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@ -96,6 +96,10 @@ static void printOp(std::ostream &O, const MachineOperand &MO,
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const MRegisterInfo &RI) {
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switch (MO.getType()) {
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case MachineOperand::MO_VirtualRegister:
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if (Value *V = MO.getVRegValue()) {
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O << "<" << V->getName() << ">";
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return;
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}
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case MachineOperand::MO_MachineRegister:
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if (MO.getReg() < MRegisterInfo::FirstVirtualRegister)
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O << RI.get(MO.getReg()).Name;
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@ -172,11 +176,15 @@ void X86InstrInfo::print(const MachineInstr *MI, std::ostream &O,
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// There are currently two forms of acceptable AddRegFrm instructions.
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// Either the instruction JUST takes a single register (like inc, dec, etc),
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// or it takes a register and an immediate of the same size as the register
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// (move immediate f.e.).
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// (move immediate f.e.). Note that this immediate value might be stored as
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// an LLVM value, to represent, for example, loading the address of a global
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// into a register.
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//
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assert(isReg(MI->getOperand(0)) &&
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(MI->getNumOperands() == 1 ||
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(MI->getNumOperands() == 2 && isImmediate(MI->getOperand(1)))) &&
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(MI->getNumOperands() == 2 &&
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(MI->getOperand(1).getVRegValue() ||
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isImmediate(MI->getOperand(1))))) &&
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"Illegal form for AddRegFrm instruction!");
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unsigned Reg = MI->getOperand(0).getReg();
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@ -11,6 +11,7 @@
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#include "llvm/CodeGen/MachineCodeEmitter.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/Value.h"
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namespace {
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class Emitter : public FunctionPass {
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@ -224,7 +225,12 @@ void Emitter::emitInstruction(MachineInstr &MI) {
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MCE.emitByte(BaseOpcode + getX86RegNum(MI.getOperand(0).getReg()));
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if (MI.getNumOperands() == 2) {
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unsigned Size = 4;
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emitConstant(MI.getOperand(1).getImmedValue(), Size);
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if (Value *V = MI.getOperand(1).getVRegValue()) {
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assert(Size == 4 && "Don't know how to emit non-pointer values!");
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MCE.emitGlobalAddress(cast<GlobalValue>(V));
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} else {
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emitConstant(MI.getOperand(1).getImmedValue(), Size);
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}
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}
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break;
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case X86II::MRMDestReg:
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@ -133,8 +133,14 @@ namespace {
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// If this operand is a constant, emit the code to copy the constant into
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// the register here...
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//
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if (Constant *C = dyn_cast<Constant>(V))
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if (Constant *C = dyn_cast<Constant>(V)) {
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copyConstantToRegister(C, Reg);
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} else if (GlobalValue *GV = dyn_cast<GlobalValue>(V)) {
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// Move the address of the global into the register
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BuildMI(BB, X86::MOVir32, 1, Reg).addReg(GV);
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} else {
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assert(0 && "Don't know how to handle a value of this type!");
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}
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return Reg;
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}
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