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Add support for referencing global variables/functions

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4907 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2002-12-04 06:45:19 +00:00
parent b72d221d61
commit dbf30f7b02
6 changed files with 48 additions and 8 deletions
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8
lib/Target/X86/InstSelectSimple.cpp
View File

@ -133,8 +133,14 @@ namespace {
// If this operand is a constant, emit the code to copy the constant into
// the register here...
//
if (Constant *C = dyn_cast<Constant>(V))
if (Constant *C = dyn_cast<Constant>(V)) {
copyConstantToRegister(C, Reg);
} else if (GlobalValue *GV = dyn_cast<GlobalValue>(V)) {
// Move the address of the global into the register
BuildMI(BB, X86::MOVir32, 1, Reg).addReg(GV);
} else {
assert(0 && "Don't know how to handle a value of this type!");
}
return Reg;
}

8
lib/Target/X86/MachineCodeEmitter.cpp
View File

@ -11,6 +11,7 @@
#include "llvm/CodeGen/MachineCodeEmitter.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/Value.h"
namespace {
class Emitter : public FunctionPass {
@ -224,7 +225,12 @@ void Emitter::emitInstruction(MachineInstr &MI) {
MCE.emitByte(BaseOpcode + getX86RegNum(MI.getOperand(0).getReg()));
if (MI.getNumOperands() == 2) {
unsigned Size = 4;
emitConstant(MI.getOperand(1).getImmedValue(), Size);
if (Value *V = MI.getOperand(1).getVRegValue()) {
assert(Size == 4 && "Don't know how to emit non-pointer values!");
MCE.emitGlobalAddress(cast<GlobalValue>(V));
} else {
emitConstant(MI.getOperand(1).getImmedValue(), Size);
}
}
break;
case X86II::MRMDestReg:

12
lib/Target/X86/Printer.cpp
View File

@ -96,6 +96,10 @@ static void printOp(std::ostream &O, const MachineOperand &MO,
const MRegisterInfo &RI) {
switch (MO.getType()) {
case MachineOperand::MO_VirtualRegister:
if (Value *V = MO.getVRegValue()) {
O << "<" << V->getName() << ">";
return;
}
case MachineOperand::MO_MachineRegister:
if (MO.getReg() < MRegisterInfo::FirstVirtualRegister)
O << RI.get(MO.getReg()).Name;
@ -172,11 +176,15 @@ void X86InstrInfo::print(const MachineInstr *MI, std::ostream &O,
// There are currently two forms of acceptable AddRegFrm instructions.
// Either the instruction JUST takes a single register (like inc, dec, etc),
// or it takes a register and an immediate of the same size as the register
// (move immediate f.e.).
// (move immediate f.e.). Note that this immediate value might be stored as
// an LLVM value, to represent, for example, loading the address of a global
// into a register.
//
assert(isReg(MI->getOperand(0)) &&
(MI->getNumOperands() == 1 ||
(MI->getNumOperands() == 2 && isImmediate(MI->getOperand(1)))) &&
(MI->getNumOperands() == 2 &&
(MI->getOperand(1).getVRegValue() ||
isImmediate(MI->getOperand(1))))) &&
"Illegal form for AddRegFrm instruction!");
unsigned Reg = MI->getOperand(0).getReg();

12
lib/Target/X86/X86AsmPrinter.cpp
View File

@ -96,6 +96,10 @@ static void printOp(std::ostream &O, const MachineOperand &MO,
const MRegisterInfo &RI) {
switch (MO.getType()) {
case MachineOperand::MO_VirtualRegister:
if (Value *V = MO.getVRegValue()) {
O << "<" << V->getName() << ">";
return;
}
case MachineOperand::MO_MachineRegister:
if (MO.getReg() < MRegisterInfo::FirstVirtualRegister)
O << RI.get(MO.getReg()).Name;
@ -172,11 +176,15 @@ void X86InstrInfo::print(const MachineInstr *MI, std::ostream &O,
// There are currently two forms of acceptable AddRegFrm instructions.
// Either the instruction JUST takes a single register (like inc, dec, etc),
// or it takes a register and an immediate of the same size as the register
// (move immediate f.e.).
// (move immediate f.e.). Note that this immediate value might be stored as
// an LLVM value, to represent, for example, loading the address of a global
// into a register.
//
assert(isReg(MI->getOperand(0)) &&
(MI->getNumOperands() == 1 ||
(MI->getNumOperands() == 2 && isImmediate(MI->getOperand(1)))) &&
(MI->getNumOperands() == 2 &&
(MI->getOperand(1).getVRegValue() ||
isImmediate(MI->getOperand(1))))) &&
"Illegal form for AddRegFrm instruction!");
unsigned Reg = MI->getOperand(0).getReg();

8
lib/Target/X86/X86CodeEmitter.cpp
View File

@ -11,6 +11,7 @@
#include "llvm/CodeGen/MachineCodeEmitter.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/Value.h"
namespace {
class Emitter : public FunctionPass {
@ -224,7 +225,12 @@ void Emitter::emitInstruction(MachineInstr &MI) {
MCE.emitByte(BaseOpcode + getX86RegNum(MI.getOperand(0).getReg()));
if (MI.getNumOperands() == 2) {
unsigned Size = 4;
emitConstant(MI.getOperand(1).getImmedValue(), Size);
if (Value *V = MI.getOperand(1).getVRegValue()) {
assert(Size == 4 && "Don't know how to emit non-pointer values!");
MCE.emitGlobalAddress(cast<GlobalValue>(V));
} else {
emitConstant(MI.getOperand(1).getImmedValue(), Size);
}
}
break;
case X86II::MRMDestReg:

8
lib/Target/X86/X86ISelSimple.cpp
View File

@ -133,8 +133,14 @@ namespace {
// If this operand is a constant, emit the code to copy the constant into
// the register here...
//
if (Constant *C = dyn_cast<Constant>(V))
if (Constant *C = dyn_cast<Constant>(V)) {
copyConstantToRegister(C, Reg);
} else if (GlobalValue *GV = dyn_cast<GlobalValue>(V)) {
// Move the address of the global into the register
BuildMI(BB, X86::MOVir32, 1, Reg).addReg(GV);
} else {
assert(0 && "Don't know how to handle a value of this type!");
}
return Reg;
}