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module RubyVM::RJIT
# Maximum number of temp value types we keep track of
MAX_TEMP_TYPES = 8
# Maximum number of local variable types we keep track of
MAX_LOCAL_TYPES = 8
# Operand to a YARV bytecode instruction
SelfOpnd = :SelfOpnd # The value is self
StackOpnd = Data.define(:index) # Temporary stack operand with stack index
# Potential mapping of a value on the temporary stack to self,
# a local variable, or constant so that we can track its type
MapToStack = :MapToStack # Normal stack value
MapToSelf = :MapToSelf # Temp maps to the self operand
MapToLocal = Data.define(:local_index) # Temp maps to a local variable with index
class Context < Struct.new(
:stack_size, # @param [Integer] The number of values on the stack
:sp_offset, # @param [Integer] JIT sp offset relative to the interpreter's sp
:chain_depth, # @param [Integer] jit_chain_guard depth
:local_types, # @param [Array<RubyVM::RJIT::Type>] Local variable types we keep track of
:temp_types, # @param [Array<RubyVM::RJIT::Type>] Temporary variable types we keep track of
:self_type, # @param [RubyVM::RJIT::Type] Type we track for self
:temp_mapping, # @param [Array<Symbol>] Mapping of temp stack entries to types we track
)
def initialize(
stack_size: 0,
sp_offset: 0,
chain_depth: 0,
local_types: [Type::Unknown] * MAX_LOCAL_TYPES,
temp_types: [Type::Unknown] * MAX_TEMP_TYPES,
self_type: Type::Unknown,
temp_mapping: [MapToStack] * MAX_TEMP_TYPES
) = super
# Deep dup by default for safety
def dup
ctx = super
ctx.local_types = ctx.local_types.dup
ctx.temp_types = ctx.temp_types.dup
ctx.temp_mapping = ctx.temp_mapping.dup
ctx
end
# Create a new Context instance with a given stack_size and sp_offset adjusted
# accordingly. This is useful when you want to virtually rewind a stack_size for
# generating a side exit while considering past sp_offset changes on gen_save_sp.
def with_stack_size(stack_size)
ctx = self.dup
ctx.sp_offset -= ctx.stack_size - stack_size
ctx.stack_size = stack_size
ctx
end
def stack_opnd(depth_from_top)
[SP, C.VALUE.size * (self.sp_offset - 1 - depth_from_top)]
end
def sp_opnd(offset_bytes = 0)
[SP, (C.VALUE.size * self.sp_offset) + offset_bytes]
end
# Push one new value on the temp stack with an explicit mapping
# Return a pointer to the new stack top
def stack_push_mapping(mapping_temp_type)
stack_size = self.stack_size
# Keep track of the type and mapping of the value
if stack_size < MAX_TEMP_TYPES
mapping, temp_type = mapping_temp_type
self.temp_mapping[stack_size] = mapping
self.temp_types[stack_size] = temp_type
case mapping
in MapToLocal[idx]
assert(idx < MAX_LOCAL_TYPES)
else
end
end
self.stack_size += 1
self.sp_offset += 1
return self.stack_opnd(0)
end
# Push one new value on the temp stack
# Return a pointer to the new stack top
def stack_push(val_type)
return self.stack_push_mapping([MapToStack, val_type])
end
# Push the self value on the stack
def stack_push_self
return self.stack_push_mapping([MapToStack, Type::Unknown])
end
# Push a local variable on the stack
def stack_push_local(local_idx)
if local_idx >= MAX_LOCAL_TYPES
return self.stack_push(Type::Unknown)
end
return self.stack_push_mapping([MapToLocal[local_idx], Type::Unknown])
end
# Pop N values off the stack
# Return a pointer to the stack top before the pop operation
def stack_pop(n = 1)
assert(n <= self.stack_size)
top = self.stack_opnd(0)
# Clear the types of the popped values
n.times do |i|
idx = self.stack_size - i - 1
if idx < MAX_TEMP_TYPES
self.temp_types[idx] = Type::Unknown
self.temp_mapping[idx] = MapToStack
end
end
self.stack_size -= n
self.sp_offset -= n
return top
end
def shift_stack(argc)
assert(argc < self.stack_size)
method_name_index = self.stack_size - argc - 1
(method_name_index...(self.stack_size - 1)).each do |i|
if i + 1 < MAX_TEMP_TYPES
self.temp_types[i] = self.temp_types[i + 1]
self.temp_mapping[i] = self.temp_mapping[i + 1]
end
end
self.stack_pop(1)
end
# Get the type of an instruction operand
def get_opnd_type(opnd)
case opnd
in SelfOpnd
self.self_type
in StackOpnd[idx]
assert(idx < self.stack_size)
stack_idx = self.stack_size - 1 - idx
# If outside of tracked range, do nothing
if stack_idx >= MAX_TEMP_TYPES
return Type::Unknown
end
mapping = self.temp_mapping[stack_idx]
case mapping
in MapToSelf
self.self_type
in MapToStack
self.temp_types[self.stack_size - 1 - idx]
in MapToLocal[idx]
assert(idx < MAX_LOCAL_TYPES)
self.local_types[idx]
end
end
end
# Get the currently tracked type for a local variable
def get_local_type(idx)
self.local_types[idx] || Type::Unknown
end
# Upgrade (or "learn") the type of an instruction operand
# This value must be compatible and at least as specific as the previously known type.
# If this value originated from self, or an lvar, the learned type will be
# propagated back to its source.
def upgrade_opnd_type(opnd, opnd_type)
case opnd
in SelfOpnd
self.self_type = self.self_type.upgrade(opnd_type)
in StackOpnd[idx]
assert(idx < self.stack_size)
stack_idx = self.stack_size - 1 - idx
# If outside of tracked range, do nothing
if stack_idx >= MAX_TEMP_TYPES
return
end
mapping = self.temp_mapping[stack_idx]
case mapping
in MapToSelf
self.self_type = self.self_type.upgrade(opnd_type)
in MapToStack
self.temp_types[stack_idx] = self.temp_types[stack_idx].upgrade(opnd_type)
in MapToLocal[idx]
assert(idx < MAX_LOCAL_TYPES)
self.local_types[idx] = self.local_types[idx].upgrade(opnd_type)
end
end
end
# Get both the type and mapping (where the value originates) of an operand.
# This is can be used with stack_push_mapping or set_opnd_mapping to copy
# a stack value's type while maintaining the mapping.
def get_opnd_mapping(opnd)
opnd_type = self.get_opnd_type(opnd)
case opnd
in SelfOpnd
return [MapToSelf, opnd_type]
in StackOpnd[idx]
assert(idx < self.stack_size)
stack_idx = self.stack_size - 1 - idx
if stack_idx < MAX_TEMP_TYPES
return [self.temp_mapping[stack_idx], opnd_type]
else
# We can't know the source of this stack operand, so we assume it is
# a stack-only temporary. type will be UNKNOWN
assert(opnd_type == Type::Unknown)
return [MapToStack, opnd_type]
end
end
end
# Overwrite both the type and mapping of a stack operand.
def set_opnd_mapping(opnd, mapping_opnd_type)
case opnd
in SelfOpnd
raise 'self always maps to self'
in StackOpnd[idx]
assert(idx < self.stack_size)
stack_idx = self.stack_size - 1 - idx
# If outside of tracked range, do nothing
if stack_idx >= MAX_TEMP_TYPES
return
end
mapping, opnd_type = mapping_opnd_type
self.temp_mapping[stack_idx] = mapping
# Only used when mapping == MAP_STACK
self.temp_types[stack_idx] = opnd_type
end
end
# Set the type of a local variable
def set_local_type(local_idx, local_type)
if local_idx >= MAX_LOCAL_TYPES
return
end
# If any values on the stack map to this local we must detach them
MAX_TEMP_TYPES.times do |stack_idx|
case self.temp_mapping[stack_idx]
in MapToStack
# noop
in MapToSelf
# noop
in MapToLocal[idx]
if idx == local_idx
self.temp_types[stack_idx] = self.local_types[idx]
self.temp_mapping[stack_idx] = MapToStack
else
# noop
end
end
end
self.local_types[local_idx] = local_type
end
# Erase local variable type information
# eg: because of a call we can't track
def clear_local_types
# When clearing local types we must detach any stack mappings to those
# locals. Even if local values may have changed, stack values will not.
MAX_TEMP_TYPES.times do |stack_idx|
case self.temp_mapping[stack_idx]
in MapToStack
# noop
in MapToSelf
# noop
in MapToLocal[local_idx]
self.temp_types[stack_idx] = self.local_types[local_idx]
self.temp_mapping[stack_idx] = MapToStack
end
end
# Clear the local types
self.local_types = [Type::Unknown] * MAX_LOCAL_TYPES
end
# Compute a difference score for two context objects
def diff(dst)
# Self is the source context (at the end of the predecessor)
src = self
# Can only lookup the first version in the chain
if dst.chain_depth != 0
return TypeDiff::Incompatible
end
# Blocks with depth > 0 always produce new versions
# Sidechains cannot overlap
if src.chain_depth != 0
return TypeDiff::Incompatible
end
if dst.stack_size != src.stack_size
return TypeDiff::Incompatible
end
if dst.sp_offset != src.sp_offset
return TypeDiff::Incompatible
end
# Difference sum
diff = 0
# Check the type of self
diff += case src.self_type.diff(dst.self_type)
in TypeDiff::Compatible[diff] then diff
in TypeDiff::Incompatible then return TypeDiff::Incompatible
end
# For each local type we track
src.local_types.size.times do |i|
t_src = src.local_types[i]
t_dst = dst.local_types[i]
diff += case t_src.diff(t_dst)
in TypeDiff::Compatible[diff] then diff
in TypeDiff::Incompatible then return TypeDiff::Incompatible
end
end
# For each value on the temp stack
src.stack_size.times do |i|
src_mapping, src_type = src.get_opnd_mapping(StackOpnd[i])
dst_mapping, dst_type = dst.get_opnd_mapping(StackOpnd[i])
# If the two mappings aren't the same
if src_mapping != dst_mapping
if dst_mapping == MapToStack
# We can safely drop information about the source of the temp
# stack operand.
diff += 1
else
return TypeDiff::Incompatible
end
end
diff += case src_type.diff(dst_type)
in TypeDiff::Compatible[diff] then diff
in TypeDiff::Incompatible then return TypeDiff::Incompatible
end
end
return TypeDiff::Compatible[diff]
end
private
def assert(cond)
unless cond
raise "'#{cond.inspect}' was not true"
end
end
end
end