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llvm_typer.cr
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require "../types"
require "llvm"
module Crystal
class LLVMTyper
getter landing_pad_type : LLVM::Type
alias TypeCache = Hash(Type, LLVM::Type)
@layout : LLVM::TargetData
@landing_pad_type : LLVM::Type
@@closure_counter = 0
def initialize(@program : Program, @llvm_context : LLVM::Context)
@cache = TypeCache.new
@struct_cache = TypeCache.new
# For union types we just need to know the maximum size of their types.
# It might happen that we have a recursive type, for example:
#
# ```
# struct Foo
# def initialize
# @x = uninitialized Pointer(Int32 | Foo)
# end
# end
# ```
#
# In that case, when we are computing the llvm type of Foo, we will
# need to compute the llvm type of `@x`. Its type is a pointer to
# a union. In order to compute the llvm type of a union we need
# to compute the size of each type. For this, we compute the llvm
# type of each type in the union and then get their size. The problem
# here is that we are computing `Foo`, so we can't know its size yet.
#
# To solve this, when computing the llvm type of the union types,
# we do it with a `wants_size` flag. In the case of pointers we
# can just return a word size (using size_of(LLVM::VoidPointer)) instead
# of computing the llvm type of the pointer element. This avoids the
# recursion.
#
# We still need a separate cache for this types that we use to compute
# types, because there can be cycles.
@wants_size_cache = TypeCache.new
@wants_size_struct_cache = TypeCache.new
@structs = {} of String => LLVM::Type
machine = program.target_machine
@layout = machine.data_layout
@landing_pad_type = @llvm_context.struct([@llvm_context.void_pointer, @llvm_context.int32], "landing_pad")
end
def type_id_pointer
@llvm_context.int32.pointer
end
@proc_type : LLVM::Type?
def proc_type
@proc_type ||= @structs["->"] ||= @llvm_context.struct [@llvm_context.void_pointer, @llvm_context.void_pointer], "->"
end
@nil_type : LLVM::Type?
def nil_type
@nil_type ||= @structs["Nil"] ||= @llvm_context.struct([] of LLVM::Type, "Nil")
end
def nil_value
nil_type.null
end
def llvm_string_type(bytesize)
@llvm_context.struct [
@llvm_context.int32, # type_id
@llvm_context.int32, # @bytesize
@llvm_context.int32, # @length
@llvm_context.int8.array(bytesize + 1), # @c
]
end
def llvm_type(type, wants_size = false)
type = type.remove_indirection
if wants_size
@wants_size_cache[type] ||= create_llvm_type(type, wants_size: true)
else
@cache[type] ||= create_llvm_type(type, wants_size)
end
end
private def create_llvm_type(type : NoReturnType, wants_size)
@llvm_context.void
end
private def create_llvm_type(type : VoidType, wants_size)
@llvm_context.void
end
private def create_llvm_type(type : NilType, wants_size)
nil_type
end
private def create_llvm_type(type : BoolType, wants_size)
@llvm_context.int1
end
private def create_llvm_type(type : CharType, wants_size)
@llvm_context.int32
end
private def create_llvm_type(type : IntegerType, wants_size)
@llvm_context.int(8 * type.bytes)
end
private def create_llvm_type(type : FloatType, wants_size)
type.bytes == 4 ? @llvm_context.float : @llvm_context.double
end
private def create_llvm_type(type : SymbolType, wants_size)
@llvm_context.int32
end
private def create_llvm_type(type : EnumType, wants_size)
llvm_type(type.base_type)
end
private def create_llvm_type(type : ProcInstanceType, wants_size)
proc_type
end
private def create_llvm_type(type : InstanceVarContainer, wants_size)
# The size of a class is the same as the size of a pointer
if wants_size && !type.struct?
return @llvm_context.void_pointer
end
final_type = llvm_struct_type(type, wants_size)
unless type.struct?
final_type = final_type.pointer
end
final_type
end
private def create_llvm_type(type : MetaclassType, wants_size)
@llvm_context.int32
end
private def create_llvm_type(type : LibType, wants_size)
@llvm_context.int32
end
private def create_llvm_type(type : GenericClassInstanceMetaclassType, wants_size)
@llvm_context.int32
end
private def create_llvm_type(type : GenericModuleInstanceMetaclassType, wants_size)
@llvm_context.int32
end
private def create_llvm_type(type : VirtualMetaclassType, wants_size)
@llvm_context.int32
end
private def create_llvm_type(type : PointerInstanceType, wants_size)
if wants_size
return @llvm_context.void_pointer
end
pointed_type = llvm_embedded_type(type.element_type, wants_size)
pointed_type = @llvm_context.int8 if pointed_type.void?
pointed_type.pointer
end
private def create_llvm_type(type : StaticArrayInstanceType, wants_size)
pointed_type = llvm_embedded_type(type.element_type, wants_size)
pointed_type = @llvm_context.int8 if pointed_type.void?
pointed_type.array type.size.as(NumberLiteral).value.to_i
end
private def create_llvm_type(type : TupleInstanceType, wants_size)
llvm_name = llvm_name(type, wants_size)
if s = @structs[llvm_name]?
return s
end
@llvm_context.struct(llvm_name) do |a_struct|
if wants_size
@wants_size_cache[type] = a_struct
else
@cache[type] = a_struct
@structs[llvm_name] = a_struct
end
type.tuple_types.map { |tuple_type| llvm_embedded_type(tuple_type, wants_size).as(LLVM::Type) }
end
end
private def create_llvm_type(type : NamedTupleInstanceType, wants_size)
llvm_name = llvm_name(type, wants_size)
if s = @structs[llvm_name]?
return s
end
@llvm_context.struct(llvm_name) do |a_struct|
if wants_size
@wants_size_cache[type] = a_struct
else
@cache[type] = a_struct
@structs[llvm_name] = a_struct
end
type.entries.map { |entry| llvm_embedded_type(entry.type, wants_size).as(LLVM::Type) }
end
end
private def create_llvm_type(type : NilableType, wants_size)
llvm_type(type.not_nil_type, wants_size)
end
private def create_llvm_type(type : ReferenceUnionType, wants_size)
type_id_pointer
end
private def create_llvm_type(type : NilableReferenceUnionType, wants_size)
type_id_pointer
end
private def create_llvm_type(type : NilableProcType, wants_size)
proc_type
end
private def create_llvm_type(type : TypeDefType, wants_size)
llvm_type(type.typedef, wants_size)
end
private def create_llvm_type(type : VirtualType, wants_size)
type_id_pointer
end
private def create_llvm_type(type : AliasType, wants_size)
llvm_type(type.remove_alias, wants_size)
end
private def create_llvm_type(type : ReferenceStorageType, wants_size)
llvm_struct_type(type.reference_type, wants_size)
end
private def create_llvm_type(type : NonGenericModuleType | GenericClassType, wants_size)
# This can only be reached if the module or generic class don't have implementors
@llvm_context.int1
end
private def create_llvm_type(type : Type, wants_size)
raise "BUG: called create_llvm_type for #{type}"
end
def llvm_struct_type(type, wants_size = false)
type = type.remove_indirection
if wants_size
@wants_size_struct_cache[type] ||= create_llvm_struct_type(type, wants_size: true)
else
@struct_cache[type] ||= create_llvm_struct_type(type, wants_size)
end
end
private def create_llvm_struct_type(type : StaticArrayInstanceType, wants_size)
llvm_type(type, wants_size)
end
private def create_llvm_struct_type(type : TupleInstanceType, wants_size)
llvm_type(type, wants_size)
end
private def create_llvm_struct_type(type : NamedTupleInstanceType, wants_size)
llvm_type(type, wants_size)
end
private def create_llvm_struct_type(type : InstanceVarContainer, wants_size)
if type.extern_union?
return create_llvm_c_union_struct_type(type, wants_size)
end
llvm_name = llvm_name(type, wants_size)
if s = @structs[llvm_name]?
return s
end
@llvm_context.struct(llvm_name, type.packed?) do |a_struct|
if wants_size
@wants_size_struct_cache[type] = a_struct
else
@struct_cache[type] = a_struct
@structs[llvm_name] = a_struct
end
ivars = type.all_instance_vars
ivars_size = ivars.size
ivars_size += 1 unless type.struct?
element_types = Array(LLVM::Type).new(ivars_size)
element_types.push @llvm_context.int32 unless type.struct? # For the type id
ivars.each do |name, ivar|
if type.extern?
element_types.push llvm_embedded_c_type(ivar.type, wants_size)
else
element_types.push llvm_embedded_type(ivar.type, wants_size)
end
end
element_types
end
end
private def create_llvm_c_union_struct_type(type, wants_size)
llvm_name = llvm_name(type, wants_size)
if s = @structs[llvm_name]?
return s
end
@llvm_context.struct(llvm_name) do |a_struct|
if wants_size
@wants_size_struct_cache[type] = a_struct
else
@struct_cache[type] = a_struct
@structs[llvm_name] = a_struct
end
# We are going to represent the union like this:
# 1. Find out what's the type with the largest alignment
# 2. Find out what's the type's size
# 3. Have the first member of the union be an array
# of ints that match that alignment, up to that type's
# size, followed by another member that is just bytes
# to fill the rest of the union's size.
#
# So for example if we have this:
#
# struct Foo
# x : Int8
# y : Int32
# end
#
# union Bar
# foo : Foo
# padding : UInt8[24]
# end
#
# We have that for Bar, the largest alignment of its types
# is 4 (for Foo's Int32). Foo's size is 8 bytes (4 for x, 4 for y).
# Then for the first union member we'll have [2 x i32].
# The total size of the union is 24 bytes. We already filled
# 8 bytes so we still need 16 bytes.
# The resulting union is { [2 x i32], [16 x i8] }.
max_size = 0
max_align = 0
max_align_type = nil
max_align_type_size = 0
type.instance_vars.each do |name, var|
var_type = var.type
unless var_type.void?
llvm_type = llvm_embedded_c_type(var_type, wants_size: true)
size = size_of(llvm_type)
align = align_of(llvm_type)
if size > max_size
max_size = size
end
if align > max_align
max_align = align
max_align_type = llvm_type
max_align_type_size = size
end
end
end
filler = @llvm_context.int(max_align * 8)
filler_size = max_align_type_size // max_align
union_fill = [filler.array(filler_size)] of LLVM::Type
if max_align_type_size < max_size
union_fill << @llvm_context.int8.array(max_size - max_align_type_size)
end
union_fill
end
end
private def create_llvm_struct_type(type : Type, wants_size)
raise "BUG: called llvm_struct_type for #{type}"
end
def llvm_embedded_type(type, wants_size = false)
type = type.remove_indirection
case type
when NoReturnType, VoidType
@llvm_context.int8
else
llvm_type(type, wants_size)
end
end
def llvm_embedded_c_type(type : ProcInstanceType, wants_size = false)
proc_type(type).pointer
end
def llvm_embedded_c_type(type, wants_size = false)
llvm_embedded_type(type, wants_size)
end
def llvm_c_type(type : ProcInstanceType)
proc_type(type).pointer
end
def llvm_c_type(type : NilableProcType)
proc_type(type.proc_type).pointer
end
def llvm_c_type(type : TupleInstanceType)
llvm_struct_type(type)
end
def llvm_c_type(type)
if type.extern?
llvm_struct_type(type)
elsif type.passed_by_value?
# C types that are passed by value must be considered,
# for the ABI, as being passed behind a pointer
llvm_type(type).pointer
else
llvm_type(type)
end
end
# StaticArray can only be "returned" in lib externs,
# not in C functions, and there it must not be a pointer.
def llvm_c_return_type(type : StaticArrayInstanceType)
llvm_struct_type(type)
end
def llvm_c_return_type(type : NilType)
@llvm_context.void
end
def llvm_c_return_type(type)
llvm_c_type(type)
end
def llvm_return_type(type : NilType)
@llvm_context.void
end
def llvm_return_type(type)
llvm_type(type)
end
# Since LLVM 15, LLVM intrinsics must return unnamed structs, and instances
# of the named `Tuple` struct are no longer substitutable
# This happens when binding to intrinsics like `llvm.sadd.with.overflow.*`
# as lib funs directly
def llvm_intrinsic_return_type(type : TupleInstanceType)
@llvm_context.struct(type.tuple_types.map { |tuple_type| llvm_embedded_type(tuple_type).as(LLVM::Type) })
end
def llvm_intrinsic_return_type(type : NamedTupleInstanceType)
@llvm_context.struct(type.entries.map { |entry| llvm_embedded_type(entry.type).as(LLVM::Type) })
end
def llvm_intrinsic_return_type(type : Type)
llvm_return_type(type)
end
def closure_type(type : ProcInstanceType)
arg_types = type.arg_types.map { |arg_type| llvm_type(arg_type) }
arg_types.insert(0, @llvm_context.void_pointer)
LLVM::Type.function(arg_types, llvm_type(type.return_type))
end
def proc_type(type : ProcInstanceType)
arg_types = type.arg_types.map { |arg_type| llvm_type(arg_type).as(LLVM::Type) }
LLVM::Type.function(arg_types, llvm_type(type.return_type))
end
def closure_context_type(vars, parent_llvm_type, self_type)
@@closure_counter += 1
llvm_name = "closure_#{@@closure_counter}"
@llvm_context.struct(llvm_name) do |a_struct|
@structs[llvm_name] = a_struct
elems = vars.map { |var| llvm_type(var.type).as(LLVM::Type) }
# Make sure to copy the given LLVM::Type to this context
elems << copy_type(parent_llvm_type).pointer if parent_llvm_type
elems << llvm_type(self_type) if self_type
elems
end
end
# Copy existing LLVM types, possibly from another context,
# into this typer's context.
def copy_types(types : Array(LLVM::Type))
types.map do |type|
copy_type(type).as(LLVM::Type)
end
end
# Copy an existing LLVM type, possibly from another context,
# into this typer's context.
def copy_type(type : LLVM::Type)
case type.kind
when .void?
@llvm_context.void
when .integer?
@llvm_context.int(type.int_width)
when .float?
@llvm_context.float
when .double?
@llvm_context.double
when .pointer?
{% if LibLLVM::IS_LT_150 %}
copy_type(type.element_type).pointer
{% else %}
@llvm_context.pointer
{% end %}
when .array?
copy_type(type.element_type).array(type.array_size)
when .vector?
copy_type(type.element_type).vector(type.vector_size)
when .function?
params_types = copy_types(type.params_types)
ret_type = copy_type(type.return_type)
LLVM::Type.function(params_types, ret_type, type.varargs?)
when .struct?
llvm_name = type.struct_name
if llvm_name
@structs[llvm_name] ||= begin
@llvm_context.struct(llvm_name, type.packed_struct?) do |the_struct|
@structs[llvm_name] = the_struct
copy_types(type.struct_element_types)
end
end
else
# The case of an anonymous struct (only happens with C bindings and C ABI,
# where structs like `{ double, double }` are generated)
@llvm_context.struct(copy_types(type.struct_element_types), packed: type.packed_struct?)
end
else
raise "don't know how to copy type: #{type} (#{type.kind})"
end
end
def llvm_name(type, wants_size)
llvm_name = type.llvm_name
llvm_name = "#{llvm_name}.wants_size" if wants_size
llvm_name
end
def size_of(type)
if type.void?
0_u64
else
@layout.size_in_bytes type
end
end
def offset_of(type, element_index)
@layout.offset_of_element(type, element_index)
end
def align_of(type)
if type.void?
1_u32
else
@layout.abi_alignment(type)
end
end
def size_t
if @program.bits64?
@llvm_context.int64
else
@llvm_context.int32
end
end
@pointer_size : UInt64?
def pointer_size
@pointer_size ||= size_of(@llvm_context.void_pointer)
end
end
end