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aarch64_target

AArch64 direct MilkIR target pipeline to native code

aarch64
compiler
codegen
jit
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0.14.0
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#aarch64_target

AArch64 backend for direct MilkIR instruction selection.

This module owns AArch64 instruction selection, validation and lowering of an embedding-provided internal ABI contract, register allocation policy, frame layout, machine-code emission, relocations, veneers, and final linking.

#Package

  • Milky2018/aarch64_target: AArch64 Target VCode, lowering, allocation, frame layout, emission, and linking.

#When to use it

Use this module as the target sink for Milky2018/milkir/native, then install its generated code object through the embedding runtime.

Environment fields are materialized at each lowered occurrence. MilkIR owns whether stable fields remain separate rematerializable values; the target does not merge them with distance or register-pressure heuristics. No physical register is reserved for embedding context data.

#Example: define the internal ABI

///|
test "validate the AArch64 internal ABI" {
  InternalAbi::new(
    0,
    8,
    [1, 2, 3, 4, 5, 6, 7],
    [0, 1, 2, 3, 4, 5, 6, 7],
    [0, 1, 2, 3, 4, 5, 6, 7],
    [0, 1, 2, 3, 4, 5, 6, 7],
  )
  |> ignore
}

#Integration

Finish a DirectLoweringSession, then use compile_selected for the complete AArch64 target pipeline. It produces a verified Milky2018/vcode/code_object value. Runtime symbol resolution, relocation application, and executable-memory ownership remain responsibilities of the embedding application.

compile performs allocation, frame planning, and emission without repeating checkpoint validation. Its optional on_event callback reports generic stage boundaries and a read-only allocation summary so an embedding can collect metrics without coupling this module to a product metrics system. The callback must not mutate compiler inputs.

Internal functions use the tail-call convention: an ordinary internal caller places stack arguments in its reserved outgoing area, the callee pops that incoming area on return, and the call pseudo immediately restores the caller's frame-base SP. A function containing true tail calls enlarges its incoming area in the prologue to the maximum tail-callee requirement, then reuses that area when transferring control. Platform calls continue to use ordinary AAPCS64 caller-owned stack arguments.

Parallel moves reserve X15 and V18 as one transfer scratch per register bank. X16 remains stack-address-only, while X17 and V16/V17 serve instruction and regalloc spill needs. A stack cycle that temporarily needs the live transfer scratch receives one verified 16-byte emergency frame area; ordinary frames do not pay for it.

AArch64AllocationError

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AArch64AllocationError::output

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fn AArch64AllocationError::output(self : AArch64AllocationError, logger : &Logger) -> Unit

AArch64AllocationError::to_repr

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AArch64AllocationError::to_string

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fn AArch64AllocationError::to_string(self : AArch64AllocationError) -> String

AArch64CompileError

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pub suberror AArch64CompileError {
  TargetValidationFailed(cause~ : TargetVCodeVerifyError)
  AllocationFailed(cause~ : AArch64AllocationError)
  FramePlanningFailed(cause~ : AArch64FrameError)
  EmissionFailed(cause~ : AArch64EmitError)
} derive(
Debug)

AArch64CompileError::output

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fn AArch64CompileError::output(self : AArch64CompileError, logger : &Logger) -> Unit

AArch64CompileError::to_repr

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AArch64CompileError::to_string

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fn AArch64CompileError::to_string(self : AArch64CompileError) -> String

AArch64EmitError

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pub suberror AArch64EmitError {
  InvalidFrame(cause~ : AArch64FrameError)
  InvalidCodeObject(cause~ : 
CodeObjectVerifyError)
  InvalidParallelMove(cause~ : 
MoveResolveError)
  InvalidCallTransfer(cause~ : 
CallTransferError)
  UnresolvedStackMove
  MissingStackObjectArea
  MissingResultArea
  MissingEmergencyMoveArea
  UnexpectedStackOperand(instruction~ : 
Instruction, operand~ : Int)
  FrameOffsetOutOfRange(offset~ : Int)
  InvalidScalarMemoryAccess
  InvalidFloatInstruction
  InvalidVectorInstruction
  InvalidConversionInstruction
  BranchTargetMissing(block~ : 
Block)
  BranchLabelUnbound(label~ : Int)
  BranchSpanNotFixed(offset~ : Int)
  BranchOutOfRange(offset~ : Int, bits~ : Int)
} derive(
Debug)

AArch64EmitError::output

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fn AArch64EmitError::output(self : AArch64EmitError, logger : &Logger) -> Unit

AArch64EmitError::to_repr

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AArch64EmitError::to_string

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fn AArch64EmitError::to_string(self : AArch64EmitError) -> String

AArch64FrameError

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pub suberror AArch64FrameError {
  InvalidAllocation(cause~ : AArch64AllocationError)
  InvalidGenericFrame(cause~ : 
FrameVerifyError)
  InvalidSavedRegister(reg~ : 
PhysicalReg, offset~ : Int)
  InvalidStackSlot(slot~ : 
StackSlot)
  OutgoingAreaMismatch(expected~ : Int, actual~ : Int)
  ResultAreaMismatch(expected~ : Int, actual~ : Int)
  TailAreaMismatch(expected_incoming~ : Int, actual_incoming~ : Int, expected_tail~ : Int, actual_tail~ : Int)
  InvalidStackObjectArea(message~ : String)
  MovePlanningFailed(cause~ : 
MoveResolveError)
  InvalidEmergencyMoveArea(offset~ : Int?)
  StaleAllocation(expected_edits~ : Int, actual_edits~ : Int)
  SavedRegisterSetMismatch
} derive(
Debug)

AArch64FrameError::output

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fn AArch64FrameError::output(self : AArch64FrameError, logger : &Logger) -> Unit

AArch64FrameError::to_repr

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AArch64FrameError::to_string

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fn AArch64FrameError::to_string(self : AArch64FrameError) -> String

AArch64LinkError

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pub suberror AArch64LinkError {
  InvalidCodeObject(message~ : String)
  InvalidCodeBase(address~ : Int64)
  UnresolvedRelocation(index~ : Int)
  RelocationOutOfRange(index~ : Int)
  UnsupportedRelocation(index~ : Int)
} derive(Eq, 
Debug)

AArch64LinkError::equal

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AArch64LinkError::not_equal

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fn AArch64LinkError::not_equal(x : AArch64LinkError, y : AArch64LinkError) -> Bool

AArch64LinkError::output

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fn AArch64LinkError::output(self : AArch64LinkError, logger : &Logger) -> Unit

AArch64LinkError::to_repr

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AArch64LinkError::to_string

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fn AArch64LinkError::to_string(self : AArch64LinkError) -> String

AArch64LowerError

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pub suberror AArch64LowerError {
  UnsupportedOperation(block_index~ : Int, instruction_index~ : Int, operation~ : 
Operation)
  UnsupportedAbi(message~ : String)
  BuildFailure(cause~ : 
VCodeBuildError)
  InvalidTarget(cause~ : TargetVCodeVerifyError)
} derive(
Debug)

AArch64LowerError::output

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fn AArch64LowerError::output(self : AArch64LowerError, logger : &Logger) -> Unit

AArch64LowerError::to_repr

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AArch64LowerError::to_string

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fn AArch64LowerError::to_string(self : AArch64LowerError) -> String

InternalAbiError

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pub suberror InternalAbiError {
  InvalidRegister(role~ : String, index~ : Int)
  DuplicateRegister(role~ : String, index~ : Int)
  ContextRegisterReused(index~ : Int)
  ResultAreaRegisterReused(index~ : Int)
  InvalidSignature(message~ : String)
} derive(Eq, 
Debug)

InternalAbiError::equal

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InternalAbiError::not_equal

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fn InternalAbiError::not_equal(x : InternalAbiError, y : InternalAbiError) -> Bool

InternalAbiError::output

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fn InternalAbiError::output(self : InternalAbiError, logger : &Logger) -> Unit

InternalAbiError::to_repr

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InternalAbiError::to_string

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fn InternalAbiError::to_string(self : InternalAbiError) -> String

TargetVCodeVerifyError

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pub suberror TargetVCodeVerifyError {
  CommonFailure(cause~ : 
VCodeVerifyError)
  InvalidInstruction(instruction~ : 
Instruction, message~ : String)
} derive(Eq, 
Debug)

TargetVCodeVerifyError::equal

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TargetVCodeVerifyError::not_equal

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TargetVCodeVerifyError::output

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fn TargetVCodeVerifyError::output(self : TargetVCodeVerifyError, logger : &Logger) -> Unit

TargetVCodeVerifyError::to_repr

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TargetVCodeVerifyError::to_string

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fn TargetVCodeVerifyError::to_string(self : TargetVCodeVerifyError) -> String

AArch64Address

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AArch64Address::equal

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AArch64Address::not_equal

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fn AArch64Address::not_equal(x : AArch64Address, y : AArch64Address) -> Bool

AArch64Address::to_repr

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AArch64Condition

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pub(all) enum AArch64Condition {
  Eq
  Ne
  Lt
  Le
  Gt
  Ge
  Lo
  Ls
  Hi
  Hs
} derive(Eq, 
Debug)

AArch64Condition::equal

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AArch64Condition::not_equal

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fn AArch64Condition::not_equal(x : AArch64Condition, y : AArch64Condition) -> Bool

AArch64Condition::to_repr

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AArch64Conversion

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AArch64Conversion::equal

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AArch64Conversion::not_equal

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fn AArch64Conversion::not_equal(x : AArch64Conversion, y : AArch64Conversion) -> Bool

AArch64Conversion::to_repr

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AArch64FloatBinary

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pub(all) enum AArch64FloatBinary {
  Add
  Sub
  Mul
  Div
  Min
  Max
  CopySign
} derive(Eq, 
Debug)

AArch64FloatBinary::equal

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AArch64FloatBinary::not_equal

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AArch64FloatBinary::to_repr

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AArch64FloatCondition

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pub(all) enum AArch64FloatCondition {
  Equal
  NotEqual
  LessThan
  LessOrEqual
  GreaterThan
  GreaterOrEqual
  Ordered
  Unordered
} derive(Eq, 
Debug)

AArch64FloatCondition::equal

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AArch64FloatCondition::not_equal

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AArch64FloatCondition::to_repr

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AArch64FloatTernary

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pub(all) enum AArch64FloatTernary {
  Fmadd
  Fmsub
  Fnmadd
  Fnmsub
} derive(Eq, 
Debug)

AArch64FloatTernary::equal

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AArch64FloatTernary::not_equal

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AArch64FloatTernary::to_repr

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AArch64FloatTrapCondition

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pub(all) enum AArch64FloatTrapCondition {
  Unordered
  LessThan
  LessOrEqual
  GreaterOrEqual
} derive(Eq, 
Debug)

AArch64FloatTrapCondition::equal

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AArch64FloatTrapCondition::not_equal

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AArch64FloatTrapCondition::to_repr

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AArch64FloatUnary

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pub(all) enum AArch64FloatUnary {
  Negate
  Absolute
  SquareRoot
  Ceil
  Floor
  Truncate
  Nearest
} derive(Eq, 
Debug)

AArch64FloatUnary::equal

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AArch64FloatUnary::not_equal

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fn AArch64FloatUnary::not_equal(x : AArch64FloatUnary, y : AArch64FloatUnary) -> Bool

AArch64FloatUnary::to_repr

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AArch64Frame

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pub struct AArch64Frame {
  // private fields
}

AArch64Frame::alignment

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fn AArch64Frame::alignment(self : AArch64Frame) -> Int

AArch64Frame::emergency_move_offset

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fn AArch64Frame::emergency_move_offset(self : AArch64Frame) -> Int?

AArch64Frame::frame_size

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fn AArch64Frame::frame_size(self : AArch64Frame) -> Int

AArch64Frame::incoming_args_size

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fn AArch64Frame::incoming_args_size(self : AArch64Frame) -> Int

AArch64Frame::outgoing_args_size

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fn AArch64Frame::outgoing_args_size(self : AArch64Frame) -> Int

AArch64Frame::saved_registers

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AArch64Frame::slot_offset

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fn AArch64Frame::slot_offset(self : AArch64Frame, slot : 
StackSlot) -> Int?

AArch64Frame::stack_object_offset

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fn AArch64Frame::stack_object_offset(self : AArch64Frame, object : AArch64StackObject) -> Int?

AArch64Frame::summary

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fn AArch64Frame::summary(self : AArch64Frame) -> String

AArch64Frame::tail_args_size

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fn AArch64Frame::tail_args_size(self : AArch64Frame) -> Int

AArch64Inst

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pub(all) enum AArch64Inst {
  IncomingReg(
ValueType, 
PhysicalReg)
  IncomingStack(
ValueType, Int)
  IncomingResultArea(
PhysicalReg)
  IncomingCallResult(
ValueType, 
PhysicalReg)
  IncomingCallAreaResult(
ValueType, Int)
  OutgoingReg(
ValueType, 
PhysicalReg)
  OutgoingAreaResult(
ValueType, Int)
  KeepAlive(
ValueType)
  LoadConstant(GprWidth, UInt64)
  LoadVectorConstant(UInt64, UInt64)
  LoadNull(
ValueType)
  LoadAddress(AArch64Address)
  StackAddress(AArch64StackObject)
  LoadFloatConstant(
ValueType, UInt64)
  Move(
ValueType)
  CarrierMove(
ValueType, 
ValueType)
  Select(
ValueType)
  VectorSelect
  VectorSplat(
VectorLane)
  VectorExtractLane(
VectorLane, Int, 
Signedness?)
  VectorReplaceLane(
VectorLane, Int)
  VectorShuffle(FixedArray[Int])
  VectorSwizzle
  VectorBitwise(
VectorBitwiseOp)
  VectorIntUnary(
VectorLane, AArch64VectorIntUnary)
  VectorIntBinary(
VectorLane, AArch64VectorIntBinary)
  VectorIntShift(
VectorLane, 
VectorIntShiftOp)
  VectorIntCompare(
VectorLane, 
VectorIntComparison)
  VectorConvert(AArch64VectorConversion)
  VectorPredicate(AArch64VectorPredicate)
  VectorFloatUnary(
VectorLane, 
VectorFloatUnaryOp)
  VectorFloatBinary(
VectorLane, 
VectorFloatBinaryOp)
  VectorFloatTernary(
VectorLane, 
FloatTernaryOp)
  VectorFloatCompare(
VectorLane, 
VectorFloatComparison)
  VectorPairwiseAddI16x8
  VectorRelaxedDot8To16
  IntUnary(GprWidth, AArch64IntUnary)
  IntBinary(GprWidth, AArch64IntBinary)
  IntBinaryImmediate(GprWidth, AArch64IntBinary, UInt64)
  IntMultiplyAdd(GprWidth)
  IntShiftRegister(GprWidth, AArch64Shift)
  IntShiftImmediate(GprWidth, AArch64Shift, Int)
  IntAddShiftedLeft(GprWidth, Int)
  PopulationCount(GprWidth)
  IntHighMultiply(GprWidth, 
Signedness)
  IntWithOverflow(GprWidth, 
IntOverflowOp)
  IntRemainder(GprWidth, 
Signedness)
  TrapIfZero(GprWidth)
  TrapIfSignedDivOverflow(GprWidth)
  CompareSet(GprWidth, AArch64Condition)
  ReferenceCompareSet(
ValueType, AArch64Condition)
  FloatUnary(
ValueType, AArch64FloatUnary)
  FloatBinary(
ValueType, AArch64FloatBinary)
  FloatTernary(
ValueType, AArch64FloatTernary)
  FloatCompareSet(
ValueType, AArch64FloatCondition)
  TrapIfFloat(
ValueType, AArch64FloatTrapCondition)
  Convert(AArch64Conversion)
  AddAddress
  AddAddressImmediate(UInt64)
  AddAddressUxtw(Int)
  ScalarLoad(
AccessWidth, 
LoadExtension, 
ValueType, UInt64)
  ScalarLoadUxtw(
AccessWidth, 
LoadExtension, 
ValueType, Int)
  ScalarStore(
AccessWidth, 
ValueType, UInt64)
  ScalarStoreUxtw(
AccessWidth, 
ValueType, Int)
  VectorLoad128(UInt64)
  VectorStore128(UInt64)
  VectorLoadSplat(
VectorLane, UInt64)
  VectorLoadExtend(
VectorLane, 
Signedness, UInt64)
  VectorLoadZero(
AccessWidth, UInt64)
  VectorLoadLane(
VectorLane, Int, UInt64)
  VectorStoreLane(
VectorLane, Int, UInt64)
  AtomicLoad(
AccessWidth, 
ValueType)
  AtomicStore(
AccessWidth, 
ValueType)
  AtomicRmw(
AccessWidth, 
ValueType, 
AtomicRmwOp)
  AtomicCompareExchange(
AccessWidth, 
ValueType)
  AtomicFence
  SafepointMarker
  PlatformCall(
ExternalSymbol, 
Signature)
  ReturnsTwicePlatformCall(
ExternalSymbol, 
Signature)
  InternalCall(
CodeSymbol, 
Signature, InternalCallPlan)
  InternalCallIndirect(
Signature, InternalCallPlan)
  TailCallDirect(
CodeSymbol, 
Signature, InternalCallPlan)
  TailCallIndirect(
Signature, InternalCallPlan)
  Jump
  BranchNonZero(GprWidth)
  BranchCompare(GprWidth, AArch64Condition)
  BranchCompareImmediate(GprWidth, AArch64Condition, UInt64)
  Switch(GprWidth, Array[UInt64])
  Trap(
TrapReason)
  Return
} derive(Eq, 
Debug)

AArch64Inst::equal

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fn AArch64Inst::equal(AArch64Inst, AArch64Inst) -> Bool

AArch64Inst::not_equal

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fn AArch64Inst::not_equal(x : AArch64Inst, y : AArch64Inst) -> Bool

AArch64Inst::to_repr

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AArch64IntBinary

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pub(all) enum AArch64IntBinary {
  Add
  Sub
  Mul
  And
  Orr
  Eor
  Sdiv
  Udiv
} derive(Eq, 
Debug)

AArch64IntBinary::equal

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AArch64IntBinary::not_equal

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fn AArch64IntBinary::not_equal(x : AArch64IntBinary, y : AArch64IntBinary) -> Bool

AArch64IntBinary::to_repr

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AArch64IntUnary

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pub(all) enum AArch64IntUnary {
  Mvn
  Clz
  Rbit
  Neg
} derive(Eq, 
Debug)

AArch64IntUnary::equal

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AArch64IntUnary::not_equal

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fn AArch64IntUnary::not_equal(x : AArch64IntUnary, y : AArch64IntUnary) -> Bool

AArch64IntUnary::to_repr

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AArch64LinkPlan

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pub struct AArch64LinkPlan {
  // private fields
} derive(
Debug)

AArch64LinkPlan::code

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fn AArch64LinkPlan::code(self : AArch64LinkPlan) -> Array[Byte]

fn AArch64LinkPlan::link(self : AArch64LinkPlan, code_address : Int64, resolve : (
RelocationTarget) -> Int64?) -> Array[Byte] raise AArch64LinkError

AArch64LinkPlan::to_repr

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AArch64LinkPlan::veneer_offsets

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fn AArch64LinkPlan::veneer_offsets(self : AArch64LinkPlan) -> Array[Int]

AArch64Shift

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pub(all) enum AArch64Shift {
  Lsl
  Asr
  Lsr
  Ror
} derive(Eq, 
Debug)

AArch64Shift::equal

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AArch64Shift::not_equal

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fn AArch64Shift::not_equal(x : AArch64Shift, y : AArch64Shift) -> Bool

AArch64Shift::to_repr

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AArch64StackObject

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pub struct AArch64StackObject {
  id : Int
  size : Int
  alignment : Int
} derive(Eq, 
Debug)

AArch64StackObject::equal

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AArch64StackObject::new

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fn AArch64StackObject::new(id : Int, size : Int, alignment : Int) -> AArch64StackObject

AArch64StackObject::not_equal

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AArch64StackObject::to_repr

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AArch64VectorConversion

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AArch64VectorConversion::equal

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AArch64VectorConversion::not_equal

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AArch64VectorConversion::to_repr

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AArch64VectorIntBinary

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AArch64VectorIntBinary::equal

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AArch64VectorIntBinary::not_equal

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AArch64VectorIntBinary::to_repr

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AArch64VectorIntUnary

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pub(all) enum AArch64VectorIntUnary {
  Absolute
  Negate
  PopulationCount
  ExtendAddPairwise(
Signedness)
} derive(Eq, 
Debug)

AArch64VectorIntUnary::equal

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AArch64VectorIntUnary::not_equal

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AArch64VectorIntUnary::to_repr

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AArch64VectorPredicate

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AArch64VectorPredicate::equal

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AArch64VectorPredicate::not_equal

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AArch64VectorPredicate::to_repr

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CallArgumentLocation

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type CallArgumentLocation derive(Eq, 
Debug)

CallArgumentLocation::equal

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CallArgumentLocation::not_equal

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CallArgumentLocation::to_repr

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CallLayout

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type CallLayout derive(Eq, 
Debug)

CallLayout::equal

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fn CallLayout::equal(CallLayout, CallLayout) -> Bool

CallLayout::not_equal

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fn CallLayout::not_equal(x : CallLayout, y : CallLayout) -> Bool

CallLayout::to_repr

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CallResultLocation

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type CallResultLocation derive(Eq, 
Debug)

CallResultLocation::equal

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CallResultLocation::not_equal

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CallResultLocation::to_repr

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CompilationDiagnostics

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pub(all) struct CompilationDiagnostics {
  target_vcode : String
  allocated_vcode : String
  object : 
UnlinkedCodeObject
}

CompilationSession

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pub struct CompilationSession {
  // private fields
}

Compiles selected AArch64 VCode through allocation, frame planning, and emission. Each stage validates the invariant it introduces without revalidating invariants already established by this pipeline.

on_event is an observation-only seam. It must not mutate function or any compiler object reachable while the callback runs.

CompilationSession::compile_selected

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Compile selected VCode while retaining allocator scratch capacity for the next serial call on this session.

CompilationSession::new

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DirectLoweringSession

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pub struct DirectLoweringSession {
  // private fields
}

DirectLoweringSession::finish_selected

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fn DirectLoweringSession::finish_selected(self : DirectLoweringSession, verify_selected? : Bool) -> SelectedFunction raise AArch64LowerError

Finish direct selection and return the VCode consumed by target compilation.

verify_selected=false is reserved for compiler-owned construction paths covered by strict validation in CI. Public callers should keep the default.

DirectLoweringSession::new

source

DirectLoweringSession::sink

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GprWidth

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pub(all) enum GprWidth {
  W32
  W64
} derive(Eq, 
Debug)

GprWidth::equal

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fn GprWidth::equal(GprWidth, GprWidth) -> Bool

GprWidth::not_equal

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fn GprWidth::not_equal(x : GprWidth, y : GprWidth) -> Bool

GprWidth::to_repr

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InternalAbi

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pub struct InternalAbi {
  // private fields
}

InternalAbi::new

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fn InternalAbi::new(context_argument : Int, result_area_argument : Int, integer_arguments : Array[Int], fp_arguments : Array[Int], integer_results : Array[Int], fp_results : Array[Int]) -> InternalAbi raise InternalAbiError

InternalCallPlan

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pub struct InternalCallPlan {
  // private fields
} derive(Eq, 
Debug)

InternalCallPlan::equal

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InternalCallPlan::not_equal

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fn InternalCallPlan::not_equal(x : InternalCallPlan, y : InternalCallPlan) -> Bool

InternalCallPlan::to_repr

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LoweringContext

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pub struct LoweringContext {
  // private fields
}

LoweringContext::new

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fn LoweringContext::new(internal_abi : InternalAbi) -> LoweringContext

LoweringContext::with_environment_field

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LoweringContext::with_environment_field_resolver

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SelectedFunction

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pub struct SelectedFunction {
  // private fields
}

Opaque evidence that direct AArch64 selection and VCode validation completed.

allocate

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compile

source

Compile externally supplied AArch64 VCode through the safe validated entry.

compile_selected

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Compile VCode produced by select without repeating target validation.

diagnose_selected

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fn diagnose_selected(selected : SelectedFunction) -> CompilationDiagnostics raise AArch64CompileError

emit

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plan_frame

source

verify_allocation

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verify_frame

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verify_vcode

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fn verify_vcode(function : 
Function[AArch64Inst]) -> Unit raise TargetVCodeVerifyError

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