// Allocates a literal array on the stack
func (v *Codegen) genArrayLiteral(n *parser.ArrayLiteral) llvm.Value {
memberLLVMType := v.typeToLLVMType(n.Type.(parser.ArrayType).MemberType)
// allocate backing array
arrAlloca := v.builder.CreateArrayAlloca(llvm.ArrayType(memberLLVMType, len(n.Members)), llvm.ConstInt(llvm.IntType(32), uint64(len(n.Members)), false), "")
// allocate the array object
structAlloca := v.builder.CreateAlloca(v.typeToLLVMType(n.Type), "")
// set the length of the array
lenGEP := v.builder.CreateGEP(structAlloca, []llvm.Value{llvm.ConstInt(llvm.IntType(32), 0, false), llvm.ConstInt(llvm.IntType(32), 0, false)}, "")
v.builder.CreateStore(llvm.ConstInt(llvm.IntType(32), uint64(len(n.Members)), false), lenGEP)
// set the array pointer to the backing array we allocated
arrGEP := v.builder.CreateGEP(structAlloca, []llvm.Value{llvm.ConstInt(llvm.IntType(32), 0, false), llvm.ConstInt(llvm.IntType(32), 1, false)}, "")
v.builder.CreateStore(v.builder.CreateBitCast(arrAlloca, llvm.PointerType(llvm.ArrayType(memberLLVMType, 0), 0), ""), arrGEP)
// copy the constant array to the backing array
arrConstVals := make([]llvm.Value, 0, len(n.Members))
for _, mem := range n.Members {
arrConstVals = append(arrConstVals, v.genExpr(mem))
}
arrConst := llvm.ConstArray(llvm.ArrayType(memberLLVMType, len(n.Members)), arrConstVals)
v.builder.CreateStore(arrConst, arrAlloca)
return v.builder.CreateLoad(structAlloca, "")
}
// Allocates a literal array on the stack
func (v *Codegen) genArrayLiteral(n *parser.ArrayLiteral) llvm.Value {
arrayLLVMType := v.typeToLLVMType(n.Type)
memberLLVMType := v.typeToLLVMType(n.Type.(parser.ArrayType).MemberType)
if v.inFunction {
// allocate backing array
arrAlloca := v.builder.CreateAlloca(llvm.ArrayType(memberLLVMType, len(n.Members)), "")
// copy the constant array to the backing array
for idx, value := range n.Members {
gep := v.builder.CreateGEP(arrAlloca, []llvm.Value{llvm.ConstInt(llvm.IntType(32), 0, false), llvm.ConstInt(llvm.IntType(32), uint64(idx), false)}, "")
value := v.genExpr(value)
v.builder.CreateStore(value, gep)
}
// allocate struct
structAlloca := v.builder.CreateAlloca(arrayLLVMType, "")
// set the length of the array
lenGEP := v.builder.CreateGEP(structAlloca, []llvm.Value{llvm.ConstInt(llvm.IntType(32), 0, false), llvm.ConstInt(llvm.IntType(32), 0, false)}, "")
v.builder.CreateStore(llvm.ConstInt(llvm.IntType(32), uint64(len(n.Members)), false), lenGEP)
// set the array pointer to the backing array we allocated
arrGEP := v.builder.CreateGEP(structAlloca, []llvm.Value{llvm.ConstInt(llvm.IntType(32), 0, false), llvm.ConstInt(llvm.IntType(32), 1, false)}, "")
v.builder.CreateStore(v.builder.CreateBitCast(arrAlloca, llvm.PointerType(llvm.ArrayType(memberLLVMType, 0), 0), ""), arrGEP)
return v.builder.CreateLoad(structAlloca, "")
} else {
backName := fmt.Sprintf("_globarr_back_%d", v.arrayIndex)
v.arrayIndex++
backGlob := llvm.AddGlobal(v.curFile.Module, llvm.ArrayType(memberLLVMType, len(n.Members)), backName)
backGlob.SetLinkage(llvm.InternalLinkage)
backGlob.SetGlobalConstant(false)
arrConstVals := make([]llvm.Value, len(n.Members))
for idx, mem := range n.Members {
value := v.genExpr(mem)
if !value.IsConstant() {
v.err("Encountered non-constant value in global array")
}
arrConstVals[idx] = v.genExpr(mem)
}
backGlob.SetInitializer(llvm.ConstArray(memberLLVMType, arrConstVals))
lengthVal := llvm.ConstInt(llvm.IntType(32), uint64(len(n.Members)), false)
backRef := llvm.ConstBitCast(backGlob, llvm.PointerType(llvm.ArrayType(memberLLVMType, 0), 0))
return llvm.ConstStruct([]llvm.Value{lengthVal, backRef}, false)
}
}
// Allocates a literal array on the stack
func (v *Codegen) genArrayLiteral(n *parser.CompositeLiteral) llvm.Value {
arrayLLVMType := v.typeToLLVMType(n.Type)
memberLLVMType := v.typeToLLVMType(n.Type.ActualType().(parser.ArrayType).MemberType)
arrayValues := make([]llvm.Value, len(n.Values))
for idx, mem := range n.Values {
value := v.genExpr(mem)
if !v.inFunction() && !value.IsConstant() {
v.err("Encountered non-constant value in global array")
}
arrayValues[idx] = value
}
lengthValue := llvm.ConstInt(v.typeToLLVMType(parser.PRIMITIVE_uint), uint64(len(n.Values)), false)
var backingArrayPointer llvm.Value
if v.inFunction() {
// allocate backing array
backingArray := v.builder().CreateAlloca(llvm.ArrayType(memberLLVMType, len(n.Values)), "")
// copy the constant array to the backing array
for idx, value := range arrayValues {
gep := v.builder().CreateStructGEP(backingArray, idx, "")
v.builder().CreateStore(value, gep)
}
backingArrayPointer = v.builder().CreateBitCast(backingArray, llvm.PointerType(memberLLVMType, 0), "")
} else {
backName := fmt.Sprintf("_globarr_back_%d", v.arrayIndex)
v.arrayIndex++
backingArray := llvm.AddGlobal(v.curFile.LlvmModule, llvm.ArrayType(memberLLVMType, len(n.Values)), backName)
backingArray.SetLinkage(llvm.InternalLinkage)
backingArray.SetGlobalConstant(false)
backingArray.SetInitializer(llvm.ConstArray(memberLLVMType, arrayValues))
backingArrayPointer = llvm.ConstBitCast(backingArray, llvm.PointerType(memberLLVMType, 0))
}
structValue := llvm.Undef(arrayLLVMType)
structValue = v.builder().CreateInsertValue(structValue, lengthValue, 0, "")
structValue = v.builder().CreateInsertValue(structValue, backingArrayPointer, 1, "")
return structValue
}
func (v *Codegen) enumTypeToLLVMTypeFields(typ parser.EnumType) []llvm.Type {
longestLength := uint64(0)
for _, member := range typ.Members {
memLength := v.targetData.TypeAllocSize(v.typeToLLVMType(member.Type))
if memLength > longestLength {
longestLength = memLength
}
}
// TODO: verify no overflow
return []llvm.Type{llvm.IntType(32), llvm.ArrayType(llvm.IntType(8), int(longestLength))}
}
func (v *Codegen) genStringLiteral(n *parser.StringLiteral) llvm.Value {
memberLLVMType := v.typeToLLVMType(parser.PRIMITIVE_u8)
nullTerm := n.IsCString
length := len(n.Value)
if nullTerm {
length++
}
var backingArrayPointer llvm.Value
if v.inFunction() {
// allocate backing array
backingArray := v.builder().CreateAlloca(llvm.ArrayType(memberLLVMType, length), "stackstr")
v.builder().CreateStore(llvm.ConstString(n.Value, nullTerm), backingArray)
backingArrayPointer = v.builder().CreateBitCast(backingArray, llvm.PointerType(memberLLVMType, 0), "")
} else {
backName := fmt.Sprintf("_globarr_back_%d", v.arrayIndex)
v.arrayIndex++
backingArray := llvm.AddGlobal(v.curFile.LlvmModule, llvm.ArrayType(memberLLVMType, length), backName)
backingArray.SetLinkage(llvm.InternalLinkage)
backingArray.SetGlobalConstant(false)
backingArray.SetInitializer(llvm.ConstString(n.Value, nullTerm))
backingArrayPointer = llvm.ConstBitCast(backingArray, llvm.PointerType(memberLLVMType, 0))
}
if n.Type.ActualType().Equals(parser.ArrayOf(parser.PRIMITIVE_u8)) {
lengthValue := llvm.ConstInt(v.typeToLLVMType(parser.PRIMITIVE_uint), uint64(length), false)
structValue := llvm.Undef(v.typeToLLVMType(n.Type))
structValue = v.builder().CreateInsertValue(structValue, lengthValue, 0, "")
structValue = v.builder().CreateInsertValue(structValue, backingArrayPointer, 1, "")
return structValue
} else {
return backingArrayPointer
}
}
func (t arrayBType) ToLLVM(c llvm.Context) llvm.Type {
return llvm.ArrayType(t.elem.ToLLVM(c), int(t.length))
}
func (v *Codegen) arrayTypeToLLVMType(typ parser.ArrayType) llvm.Type {
fields := []llvm.Type{llvm.IntType(32), llvm.PointerType(llvm.ArrayType(v.typeToLLVMType(typ.MemberType), 0), 0)}
return llvm.StructType(fields, false)
}
// mapIterNext advances the iterator, and returns the tuple (ok, k, v).
func (fr *frame) mapIterNext(iter []*govalue) []*govalue {
maptyp := iter[0].Type().Underlying().(*types.Map)
ktyp := maptyp.Key()
klltyp := fr.types.ToLLVM(ktyp)
vtyp := maptyp.Elem()
vlltyp := fr.types.ToLLVM(vtyp)
m, isinitptr := iter[0], iter[1]
i8ptr := llvm.PointerType(llvm.Int8Type(), 0)
mapiterbufty := llvm.ArrayType(i8ptr, 4)
mapiterbuf := fr.allocaBuilder.CreateAlloca(mapiterbufty, "")
mapiterbufelem0ptr := fr.builder.CreateStructGEP(mapiterbuf, 0, "")
keybuf := fr.allocaBuilder.CreateAlloca(klltyp, "")
keyptr := fr.builder.CreateBitCast(keybuf, i8ptr, "")
valbuf := fr.allocaBuilder.CreateAlloca(vlltyp, "")
valptr := fr.builder.CreateBitCast(valbuf, i8ptr, "")
isinit := fr.builder.CreateLoad(isinitptr.value, "")
initbb := llvm.AddBasicBlock(fr.function, "")
nextbb := llvm.AddBasicBlock(fr.function, "")
contbb := llvm.AddBasicBlock(fr.function, "")
fr.builder.CreateCondBr(isinit, nextbb, initbb)
fr.builder.SetInsertPointAtEnd(initbb)
fr.builder.CreateStore(llvm.ConstAllOnes(llvm.Int1Type()), isinitptr.value)
fr.runtime.mapiterinit.call(fr, m.value, mapiterbufelem0ptr)
fr.builder.CreateBr(contbb)
fr.builder.SetInsertPointAtEnd(nextbb)
fr.runtime.mapiternext.call(fr, mapiterbufelem0ptr)
fr.builder.CreateBr(contbb)
fr.builder.SetInsertPointAtEnd(contbb)
mapiterbufelem0 := fr.builder.CreateLoad(mapiterbufelem0ptr, "")
okbit := fr.builder.CreateIsNotNull(mapiterbufelem0, "")
ok := fr.builder.CreateZExt(okbit, llvm.Int8Type(), "")
loadbb := llvm.AddBasicBlock(fr.function, "")
cont2bb := llvm.AddBasicBlock(fr.function, "")
fr.builder.CreateCondBr(okbit, loadbb, cont2bb)
fr.builder.SetInsertPointAtEnd(loadbb)
fr.runtime.mapiter2.call(fr, mapiterbufelem0ptr, keyptr, valptr)
loadbb = fr.builder.GetInsertBlock()
loadedkey := fr.builder.CreateLoad(keybuf, "")
loadedval := fr.builder.CreateLoad(valbuf, "")
fr.builder.CreateBr(cont2bb)
fr.builder.SetInsertPointAtEnd(cont2bb)
k := fr.builder.CreatePHI(klltyp, "")
k.AddIncoming(
[]llvm.Value{llvm.ConstNull(klltyp), loadedkey},
[]llvm.BasicBlock{contbb, loadbb},
)
v := fr.builder.CreatePHI(vlltyp, "")
v.AddIncoming(
[]llvm.Value{llvm.ConstNull(vlltyp), loadedval},
[]llvm.BasicBlock{contbb, loadbb},
)
return []*govalue{newValue(ok, types.Typ[types.Bool]), newValue(k, ktyp), newValue(v, vtyp)}
}