// convert converts the given value to the specified type, emitting code to f.
// No conversion is made, if v is already of the correct type.
func (m *Module) convert(f *Function, v value.Value, to irtypes.Type) value.Value {
// Early return if v is already of the correct type.
from := v.Type()
if irtypes.Equal(from, to) {
return v
}
fromType, ok := from.(*irtypes.Int)
if !ok {
panic(fmt.Sprintf("support for converting from type %T not yet implemented", from))
}
toType, ok := to.(*irtypes.Int)
if !ok {
panic(fmt.Sprintf("support for converting to type %T not yet implemented", to))
}
// Convert constant values.
if v, ok := v.(constant.Constant); ok {
switch v := v.(type) {
case *constant.Int:
v, err := constant.NewInt(toType, v.ValueString())
if err != nil {
panic(fmt.Sprintf("unable to create integer constant; %v", err))
}
return v
default:
panic(fmt.Sprintf("support for converting type %T not yet implemented", v))
}
}
// TODO: Add proper support for converting signed and unsigned values, using
// sext and zext, respectively.
// Convert unsigned values.
if irtypes.IsBool(fromType) {
// Zero extend boolean values.
zextInst, err := instruction.NewZExt(v, toType)
if err != nil {
panic(fmt.Sprintf("unable to create sext instruction; %v", err))
}
return f.emitInst(zextInst)
}
// Convert signed values.
if toType.Size() > fromType.Size() {
// Sign extend.
sextInst, err := instruction.NewSExt(v, toType)
if err != nil {
panic(fmt.Sprintf("unable to create sext instruction; %v", err))
}
return f.emitInst(sextInst)
}
// Truncate.
truncInst, err := instruction.NewTrunc(v, toType)
if err != nil {
panic(fmt.Sprintf("unable to create trunc instruction; %v", err))
}
return f.emitInst(truncInst)
}
// NewZExtInst returns a new zext instruction based on the given value and
// target type.
func NewZExtInst(fromType, fromVal, to interface{}) (*instruction.ZExt, error) {
from, err := NewValue(fromType, fromVal)
if err != nil {
return nil, errutil.Err(err)
}
if to, ok := to.(types.Type); ok {
return instruction.NewZExt(from, to)
}
return nil, errutil.Newf("invalid target type; expected types.Type, got %T", to)
}
// unaryExpr lowers the given unary expression to LLVM IR, emitting code to f.
func (m *Module) unaryExpr(f *Function, n *ast.UnaryExpr) value.Value {
switch n.Op {
// -expr
case token.Sub:
// Input:
// void f() {
// int x;
// -x; // <-- relevant line
// }
// Output:
// %2 = sub i32 0, %1
expr := m.expr(f, n.X)
zero := constZero(expr.Type())
subInst, err := instruction.NewSub(zero, expr)
if err != nil {
panic(fmt.Sprintf("unable to create sub instruction; %v", err))
}
// Emit sub instruction.
return f.emitInst(subInst)
// !expr
case token.Not:
// TODO: Replace `(x != 0) ^ 1` with `x == 0`. Using the former for now to
// simplify test cases, as they are generated by Clang.
// Input:
// int g() {
// int y;
// !y; // <-- relevant line
// }
// Output:
// %2 = icmp ne i32 %1, 0
// %3 = xor i1 %2, true
cond := m.cond(f, n.X)
one := constOne(cond.Type())
xorInst, err := instruction.NewXor(cond, one)
if err != nil {
panic(fmt.Sprintf("unable to create xor instruction; %v", err))
}
// Emit xor instruction.
notCond := f.emitInst(xorInst)
zextInst, err := instruction.NewZExt(notCond, m.typeOf(n.X))
if err != nil {
panic(fmt.Sprintf("unable to create zext instruction; %v", err))
}
// Emit zext instruction.
return f.emitInst(zextInst)
default:
panic(fmt.Sprintf("support for unary operator %v not yet implemented", n.Op))
}
}
// fixValueInst replaces dummy values within the given value instruction with
// their corresponding local variables.
func (m dummyMap) fixValueInst(oldValInst instruction.ValueInst) instruction.ValueInst {
switch oldValInst := oldValInst.(type) {
// Binary Operations
case *instruction.Add:
x := m.fixValue(oldValInst.X())
y := m.fixValue(oldValInst.Y())
inst, err := instruction.NewAdd(x, y)
if err != nil {
panic(errutil.Err(err))
}
return inst
case *instruction.FAdd:
x := m.fixValue(oldValInst.X())
y := m.fixValue(oldValInst.Y())
inst, err := instruction.NewFAdd(x, y)
if err != nil {
panic(errutil.Err(err))
}
return inst
case *instruction.Sub:
x := m.fixValue(oldValInst.X())
y := m.fixValue(oldValInst.Y())
inst, err := instruction.NewSub(x, y)
if err != nil {
panic(errutil.Err(err))
}
return inst
case *instruction.FSub:
x := m.fixValue(oldValInst.X())
y := m.fixValue(oldValInst.Y())
inst, err := instruction.NewFSub(x, y)
if err != nil {
panic(errutil.Err(err))
}
return inst
case *instruction.Mul:
x := m.fixValue(oldValInst.X())
y := m.fixValue(oldValInst.Y())
inst, err := instruction.NewMul(x, y)
if err != nil {
panic(errutil.Err(err))
}
return inst
case *instruction.FMul:
x := m.fixValue(oldValInst.X())
y := m.fixValue(oldValInst.Y())
inst, err := instruction.NewFMul(x, y)
if err != nil {
panic(errutil.Err(err))
}
return inst
case *instruction.UDiv:
x := m.fixValue(oldValInst.X())
y := m.fixValue(oldValInst.Y())
inst, err := instruction.NewUDiv(x, y)
if err != nil {
panic(errutil.Err(err))
}
return inst
case *instruction.SDiv:
x := m.fixValue(oldValInst.X())
y := m.fixValue(oldValInst.Y())
inst, err := instruction.NewSDiv(x, y)
if err != nil {
panic(errutil.Err(err))
}
return inst
case *instruction.FDiv:
x := m.fixValue(oldValInst.X())
y := m.fixValue(oldValInst.Y())
inst, err := instruction.NewFDiv(x, y)
if err != nil {
panic(errutil.Err(err))
}
return inst
case *instruction.URem:
x := m.fixValue(oldValInst.X())
y := m.fixValue(oldValInst.Y())
inst, err := instruction.NewURem(x, y)
if err != nil {
panic(errutil.Err(err))
}
return inst
case *instruction.SRem:
x := m.fixValue(oldValInst.X())
y := m.fixValue(oldValInst.Y())
inst, err := instruction.NewSRem(x, y)
if err != nil {
panic(errutil.Err(err))
}
return inst
case *instruction.FRem:
x := m.fixValue(oldValInst.X())
y := m.fixValue(oldValInst.Y())
inst, err := instruction.NewFRem(x, y)
if err != nil {
panic(errutil.Err(err))
}
return inst
// Bitwise Binary Operations
case *instruction.ShL:
x := m.fixValue(oldValInst.X())
y := m.fixValue(oldValInst.Y())
inst, err := instruction.NewShL(x, y)
if err != nil {
panic(errutil.Err(err))
}
return inst
case *instruction.LShR:
x := m.fixValue(oldValInst.X())
y := m.fixValue(oldValInst.Y())
inst, err := instruction.NewLShR(x, y)
if err != nil {
panic(errutil.Err(err))
}
return inst
case *instruction.AShR:
x := m.fixValue(oldValInst.X())
y := m.fixValue(oldValInst.Y())
inst, err := instruction.NewAShR(x, y)
if err != nil {
panic(errutil.Err(err))
}
return inst
case *instruction.And:
x := m.fixValue(oldValInst.X())
y := m.fixValue(oldValInst.Y())
inst, err := instruction.NewAnd(x, y)
if err != nil {
panic(errutil.Err(err))
}
return inst
case *instruction.Or:
x := m.fixValue(oldValInst.X())
y := m.fixValue(oldValInst.Y())
inst, err := instruction.NewOr(x, y)
if err != nil {
panic(errutil.Err(err))
}
return inst
case *instruction.Xor:
x := m.fixValue(oldValInst.X())
y := m.fixValue(oldValInst.Y())
inst, err := instruction.NewXor(x, y)
if err != nil {
panic(errutil.Err(err))
}
return inst
// Vector Operations
case *instruction.ExtractElement:
panic("irx.dummyMap.fixValueInst: ExtractElement not yet implemented")
case *instruction.InsertElement:
panic("irx.dummyMap.fixValueInst: InsertElement not yet implemented")
case *instruction.ShuffleVector:
panic("irx.dummyMap.fixValueInst: ShuffleVector not yet implemented")
// Aggregate Operations
case *instruction.ExtractValue:
panic("irx.dummyMap.fixValueInst: ExtractValue not yet implemented")
case *instruction.InsertValue:
panic("irx.dummyMap.fixValueInst: InsertValue not yet implemented")
// Memory Access and Addressing Operations
case *instruction.Alloca:
// Nothing to do; alloca contains no dummy values.
return oldValInst
case *instruction.Load:
srcAddr := m.fixValue(oldValInst.SrcAddr())
inst, err := instruction.NewLoad(srcAddr)
if err != nil {
panic(errutil.Err(err))
}
return inst
case *instruction.CmpXchg:
panic("irx.dummyMap.fixValueInst: CmpXchg not yet implemented")
case *instruction.AtomicRMW:
panic("irx.dummyMap.fixValueInst: AtomicRMW not yet implemented")
case *instruction.GetElementPtr:
srcAddr := m.fixValue(oldValInst.SrcAddr())
var indices []value.Value
for _, oldIndex := range oldValInst.Indices() {
index := m.fixValue(oldIndex)
indices = append(indices, index)
}
inst, err := instruction.NewGetElementPtr(srcAddr, indices)
if err != nil {
panic(errutil.Err(err))
}
return inst
// Conversion Operations
case *instruction.Trunc:
from := m.fixValue(oldValInst.From())
to := oldValInst.RetType()
inst, err := instruction.NewTrunc(from, to)
if err != nil {
panic(errutil.Err(err))
}
return inst
case *instruction.ZExt:
from := m.fixValue(oldValInst.From())
to := oldValInst.RetType()
inst, err := instruction.NewZExt(from, to)
if err != nil {
panic(errutil.Err(err))
}
return inst
case *instruction.SExt:
from := m.fixValue(oldValInst.From())
to := oldValInst.RetType()
inst, err := instruction.NewSExt(from, to)
if err != nil {
panic(errutil.Err(err))
}
return inst
case *instruction.FPTrunc:
from := m.fixValue(oldValInst.From())
to := oldValInst.RetType()
inst, err := instruction.NewFPTrunc(from, to)
if err != nil {
panic(errutil.Err(err))
}
return inst
case *instruction.FPExt:
from := m.fixValue(oldValInst.From())
to := oldValInst.RetType()
inst, err := instruction.NewFPExt(from, to)
if err != nil {
panic(errutil.Err(err))
}
return inst
case *instruction.FPToUI:
from := m.fixValue(oldValInst.From())
to := oldValInst.RetType()
inst, err := instruction.NewFPToUI(from, to)
if err != nil {
panic(errutil.Err(err))
}
return inst
case *instruction.FPToSI:
from := m.fixValue(oldValInst.From())
to := oldValInst.RetType()
inst, err := instruction.NewFPToSI(from, to)
if err != nil {
panic(errutil.Err(err))
}
return inst
case *instruction.UIToFP:
from := m.fixValue(oldValInst.From())
to := oldValInst.RetType()
inst, err := instruction.NewUIToFP(from, to)
if err != nil {
panic(errutil.Err(err))
}
return inst
case *instruction.SIToFP:
from := m.fixValue(oldValInst.From())
to := oldValInst.RetType()
inst, err := instruction.NewSIToFP(from, to)
if err != nil {
panic(errutil.Err(err))
}
return inst
case *instruction.PtrToInt:
from := m.fixValue(oldValInst.From())
to := oldValInst.RetType()
inst, err := instruction.NewPtrToInt(from, to)
if err != nil {
panic(errutil.Err(err))
}
return inst
case *instruction.IntToPtr:
from := m.fixValue(oldValInst.From())
to := oldValInst.RetType()
inst, err := instruction.NewIntToPtr(from, to)
if err != nil {
panic(errutil.Err(err))
}
return inst
case *instruction.BitCast:
from := m.fixValue(oldValInst.From())
to := oldValInst.RetType()
inst, err := instruction.NewBitCast(from, to)
if err != nil {
panic(errutil.Err(err))
}
return inst
case *instruction.AddrSpaceCast:
from := m.fixValue(oldValInst.From())
to := oldValInst.RetType()
inst, err := instruction.NewAddrSpaceCast(from, to)
if err != nil {
panic(errutil.Err(err))
}
return inst
// Other Operations
case *instruction.ICmp:
cond := oldValInst.Cond()
x := m.fixValue(oldValInst.X())
y := m.fixValue(oldValInst.Y())
inst, err := instruction.NewICmp(cond, x, y)
if err != nil {
panic(errutil.Err(err))
}
return inst
case *instruction.FCmp:
panic("irx.dummyMap.fixValueInst: FCmp not yet implemented")
case *instruction.PHI:
oldIncs := oldValInst.Incs()
var incs []*instruction.Incoming
for _, oldInc := range oldIncs {
val := m.fixValue(oldInc.Value())
pred := m.fixNamedValue(oldInc.Pred())
inc, err := instruction.NewIncoming(val, pred)
if err != nil {
panic(errutil.Err(err))
}
incs = append(incs, inc)
}
inst, err := instruction.NewPHI(incs)
if err != nil {
panic(errutil.Err(err))
}
return inst
case *instruction.Select:
cond := m.fixValue(oldValInst.Cond())
x := m.fixValue(oldValInst.X())
y := m.fixValue(oldValInst.Y())
inst, err := instruction.NewSelect(cond, x, y)
if err != nil {
panic(errutil.Err(err))
}
return inst
case *instruction.Call:
result := oldValInst.RetType()
// TODO: Fix value of callee if the type of Callee changes from string to
// value.Value.
callee := oldValInst.Callee()
var args []value.Value
for _, oldArg := range oldValInst.Args() {
arg := m.fixValue(oldArg)
args = append(args, arg)
}
inst, err := instruction.NewCall(result, callee, args)
if err != nil {
panic(errutil.Err(err))
}
return inst
case *instruction.VAArg:
panic("irx.dummyMap.fixValueInst: VAArg not yet implemented")
case *instruction.LandingPad:
panic("irx.dummyMap.fixValueInst: LandingPad not yet implemented")
case *instruction.CatchPad:
panic("irx.dummyMap.fixValueInst: CatchPad not yet implemented")
case *instruction.CleanupPad:
panic("irx.dummyMap.fixValueInst: CleanupPad not yet implemented")
default:
panic("irx.dummyMap.fixValueInst: not yet implemented")
}
}