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Prepare for compiling an ISEQ

This commit is contained in:
Takashi Kokubun 2022-12-11 21:16:33 -08:00
Родитель 40ffc1e0f4
Коммит 9c2f612017
3 изменённых файлов: 11 добавлений и 972 удалений
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948
lib/ruby_vm/mjit/compiler.rb
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@ -1,952 +1,10 @@
# Available variables and macros in JIT-ed function:
# ec: the first argument of _mjitXXX
# reg_cfp: the second argument of _mjitXXX
# GET_CFP(): refers to `reg_cfp`
# GET_EP(): refers to `reg_cfp->ep`
# GET_SP(): refers to `reg_cfp->sp`, or `(stack + stack_size)` if local_stack_p
# GET_SELF(): refers to `cfp_self`
# GET_LEP(): refers to `VM_EP_LEP(reg_cfp->ep)`
# EXEC_EC_CFP(): refers to `val = vm_exec(ec, true)` with frame setup
# CALL_METHOD(): using `GET_CFP()` and `EXEC_EC_CFP()`
# TOPN(): refers to `reg_cfp->sp`, or `*(stack + (stack_size - num - 1))` if local_stack_p
# STACK_ADDR_FROM_TOP(): refers to `reg_cfp->sp`, or `stack + (stack_size - num)` if local_stack_p
# DISPATCH_ORIGINAL_INSN(): expanded in _mjit_compile_insn.erb
# THROW_EXCEPTION(): specially defined for JIT
# RESTORE_REGS(): specially defined for `leave`
class RubyVM::MJIT::Compiler # :nodoc: all
C = RubyVM::MJIT.const_get(:C, false)
class RubyVM::MJIT::Compiler
INSNS = RubyVM::MJIT.const_get(:INSNS, false)
UNSUPPORTED_INSNS = [
:defineclass, # low priority
]
def initialize = freeze
# @param iseq [RubyVM::MJIT::CPointer::Struct]
# @param funcname [String]
# @param id [Integer]
# @return [String,NilClass]
def compile(iseq, funcname, id)
status = C.compile_status.new # not freed for now
status.compiled_iseq = iseq.body
status.compiled_id = id
init_compile_status(status, iseq.body, true) # not freed for now
if iseq.body.ci_size > 0 && status.cc_entries_index == -1
return nil
end
src = +''
if !status.compile_info.disable_send_cache && !status.compile_info.disable_inlining
unless precompile_inlinable_iseqs(src, iseq, status)
return nil
end
end
src << "VALUE\n#{funcname}(rb_execution_context_t *ec, rb_control_frame_t *reg_cfp)\n{\n"
success = compile_body(src, iseq, status)
src << "\n} // end of #{funcname}\n"
return success ? src : nil
rescue Exception => e # should we use rb_rescue in C instead?
if C.mjit_opts.warnings || C.mjit_opts.verbose > 0
$stderr.puts "MJIT error: #{e.full_message}"
end
return nil
end
private
def compile_body(src, iseq, status)
status.success = true
status.local_stack_p = !iseq.body.catch_except_p
if status.local_stack_p
src << " VALUE stack[#{iseq.body.stack_max}];\n"
else
src << " VALUE *stack = reg_cfp->sp;\n"
end
unless status.inlined_iseqs.nil? # i.e. compile root
src << " static const rb_iseq_t *original_iseq = (const rb_iseq_t *)#{iseq};\n"
end
src << " static const VALUE *const original_body_iseq = (VALUE *)#{iseq.body.iseq_encoded};\n"
src << " VALUE cfp_self = reg_cfp->self;\n" # cache self across the method
src << "#undef GET_SELF\n"
src << "#define GET_SELF() cfp_self\n"
# Simulate `opt_pc` in setup_parameters_complex. Other PCs which may be passed by catch tables
# are not considered since vm_exec doesn't call jit_exec for catch tables.
if iseq.body.param.flags.has_opt
src << "\n"
src << " switch (reg_cfp->pc - ISEQ_BODY(reg_cfp->iseq)->iseq_encoded) {\n"
(0..iseq.body.param.opt_num).each do |i|
pc_offset = iseq.body.param.opt_table[i]
src << " case #{pc_offset}:\n"
src << " goto label_#{pc_offset};\n"
end
src << " }\n"
end
# Generate merged ivar guards first if needed
if !status.compile_info.disable_ivar_cache && using_ivar?(iseq.body)
src << " if (UNLIKELY(!RB_TYPE_P(GET_SELF(), T_OBJECT))) {"
src << " goto ivar_cancel;\n"
src << " }\n"
end
compile_insns(0, 0, status, iseq.body, src)
compile_cancel_handler(src, iseq.body, status)
src << "#undef GET_SELF\n"
return status.success
end
# Compile one conditional branch. If it has branchXXX insn, this should be
# called multiple times for each branch.
def compile_insns(stack_size, pos, status, body, src)
branch = C.compile_branch.new # not freed for now
branch.stack_size = stack_size
branch.finish_p = false
while pos < body.iseq_size && !already_compiled?(status, pos) && !branch.finish_p
insn = INSNS.fetch(C.rb_vm_insn_decode(body.iseq_encoded[pos]))
status.stack_size_for_pos[pos] = branch.stack_size
src << "\nlabel_#{pos}: /* #{insn.name} */\n"
pos = compile_insn(insn, pos, status, body.iseq_encoded + (pos+1), body, branch, src)
if status.success && branch.stack_size > body.stack_max
if mjit_opts.warnings || mjit_opts.verbose > 0
$stderr.puts "MJIT warning: JIT stack size (#{branch.stack_size}) exceeded its max size (#{body.stack_max})"
end
status.success = false
end
break unless status.success
end
end
# Main function of JIT compilation, vm_exec_core counterpart for JIT. Compile one insn to `f`, may modify
# b->stack_size and return next position.
#
# When you add a new instruction to insns.def, it would be nice to have JIT compilation support here but
# it's optional. This JIT compiler just ignores ISeq which includes unknown instruction, and ISeq which
# does not have it can be compiled as usual.
def compile_insn(insn, pos, status, operands, body, b, src)
sp_inc = C.mjit_call_attribute_sp_inc(insn.bin, operands)
next_pos = pos + insn.len
result = compile_insn_entry(insn, b.stack_size, sp_inc, status.local_stack_p, pos, next_pos, insn.len,
status.inlined_iseqs.nil?, status, operands, body)
if result.nil?
if C.mjit_opts.warnings || C.mjit_opts.verbose > 0
$stderr.puts "MJIT warning: Skipped to compile unsupported instruction: #{insn.name}"
end
status.success = false
else
result_src, next_pos, finish_p, compile_insns_p = result
src << result_src
b.stack_size += sp_inc
if finish_p
b.finish_p = true
end
if compile_insns_p
if already_compiled?(status, pos + insn.len)
src << "goto label_#{pos + insn.len};\n"
else
compile_insns(b.stack_size, pos + insn.len, status, body, src)
end
end
end
# If next_pos is already compiled and this branch is not finished yet,
# next instruction won't be compiled in C code next and will need `goto`.
if !b.finish_p && next_pos < body.iseq_size && already_compiled?(status, next_pos)
src << "goto label_#{next_pos};\n"
# Verify stack size assumption is the same among multiple branches
if status.stack_size_for_pos[next_pos] != b.stack_size
if mjit_opts.warnings || mjit_opts.verbose > 0
$stderr.puts "MJIT warning: JIT stack assumption is not the same between branches (#{status.stack_size_for_pos[next_pos]} != #{b.stack_size})\n"
end
status.success = false
end
end
return next_pos
end
def compile_insn_entry(insn, stack_size, sp_inc, local_stack_p, pos, next_pos, insn_len, inlined_iseq_p, status, operands, body)
finish_p = false
compile_insns = false
# TODO: define this outside this method, or at least cache it
opt_send_without_block = INSNS.values.find { |i| i.name == :opt_send_without_block }
if opt_send_without_block.nil?
raise 'opt_send_without_block not found'
end
send_compatible_opt_insns = INSNS.values.select do |insn|
insn.name.start_with?('opt_') && opt_send_without_block.opes == insn.opes &&
insn.expr.lines.any? { |l| l.match(/\A\s+CALL_SIMPLE_METHOD\(\);\s+\z/) }
end.map(&:name)
case insn.name
when *UNSUPPORTED_INSNS
return nil
when :opt_send_without_block, :send
if src = compile_send(insn, stack_size, sp_inc, local_stack_p, pos, next_pos, status, operands, body)
return src, next_pos, finish_p, compile_insns
end
when *send_compatible_opt_insns
if C.has_cache_for_send(captured_cc_entries(status)[call_data_index(C.CALL_DATA.new(operands[0]), body)], insn.bin) &&
src = compile_send(opt_send_without_block, stack_size, sp_inc, local_stack_p, pos, next_pos, status, operands, body)
return src, next_pos, finish_p, compile_insns
end
when :getinstancevariable, :setinstancevariable
if src = compile_ivar(insn.name, stack_size, pos, status, operands, body)
return src, next_pos, finish_p, compile_insns
end
when :opt_getconstant_path
if src = compile_getconstant_path(stack_size, pos, insn_len, operands, status)
return src, next_pos, finish_p, compile_insns
end
when :invokebuiltin, :opt_invokebuiltin_delegate, :opt_invokebuiltin_delegate_leave
if src = compile_invokebuiltin(insn, stack_size, sp_inc, body, operands)
if insn.name == :opt_invokebuiltin_delegate_leave
src << compile_leave(stack_size, pos, inlined_iseq_p)
finish_p = true
end
return src, next_pos, finish_p, compile_insns
end
when :leave
if stack_size != 1
raise "Unexpected JIT stack_size on leave: #{stack_size}"
end
src = compile_leave(stack_size, pos, inlined_iseq_p)
finish_p = true
return src, next_pos, finish_p, compile_insns
end
return compile_insn_default(insn, stack_size, sp_inc, local_stack_p, pos, next_pos, insn_len, inlined_iseq_p, operands)
end
# Optimized case of send / opt_send_without_block instructions.
def compile_send(insn, stack_size, sp_inc, local_stack_p, pos, next_pos, status, operands, body)
# compiler: Use captured cc to avoid race condition
cd = C.CALL_DATA.new(operands[0])
cd_index = call_data_index(cd, body)
captured_cc = captured_cc_entries(status)[cd_index]
# compiler: Inline send insn where some supported fastpath is used.
ci = cd.ci
kw_splat = (C.vm_ci_flag(ci) & C.VM_CALL_KW_SPLAT) > 0
if !status.compile_info.disable_send_cache && has_valid_method_type?(captured_cc) && (
# `CC_SET_FASTPATH(cd->cc, vm_call_cfunc_with_frame, ...)` in `vm_call_cfunc`
(vm_cc_cme(captured_cc).def.type == C.VM_METHOD_TYPE_CFUNC && !C.rb_splat_or_kwargs_p(ci) && !kw_splat) ||
# `CC_SET_FASTPATH(cc, vm_call_iseq_setup_func(...), vm_call_iseq_optimizable_p(...))` in `vm_callee_setup_arg`,
# and support only non-VM_CALL_TAILCALL path inside it
(vm_cc_cme(captured_cc).def.type == C.VM_METHOD_TYPE_ISEQ &&
C.fastpath_applied_iseq_p(ci, captured_cc, iseq = def_iseq_ptr(vm_cc_cme(captured_cc).def)) &&
(C.vm_ci_flag(ci) & C.VM_CALL_TAILCALL) == 0)
)
src = +"{\n"
# JIT: Invalidate call cache if it requires vm_search_method. This allows to inline some of following things.
src << " const struct rb_callcache *cc = (struct rb_callcache *)#{captured_cc};\n"
src << " const rb_callable_method_entry_t *cc_cme = (rb_callable_method_entry_t *)#{vm_cc_cme(captured_cc)};\n"
src << " const VALUE recv = stack[#{stack_size + sp_inc - 1}];\n"
# If opt_class_of is true, use RBASIC_CLASS instead of CLASS_OF to reduce code size
opt_class_of = !maybe_special_const?(captured_cc.klass)
src << " if (UNLIKELY(#{opt_class_of ? 'RB_SPECIAL_CONST_P(recv)' : 'false'} || !vm_cc_valid_p(cc, cc_cme, #{opt_class_of ? 'RBASIC_CLASS' : 'CLASS_OF'}(recv)))) {\n"
src << " reg_cfp->pc = original_body_iseq + #{pos};\n"
src << " reg_cfp->sp = vm_base_ptr(reg_cfp) + #{stack_size};\n"
src << " goto send_cancel;\n"
src << " }\n"
# JIT: move sp and pc if necessary
pc_moved_p = compile_pc_and_sp(src, insn, stack_size, sp_inc, local_stack_p, next_pos)
# JIT: If ISeq is inlinable, call the inlined method without pushing a frame.
if iseq && status.inlined_iseqs && iseq.body.to_i == status.inlined_iseqs[pos]&.to_i
src << " {\n"
src << " VALUE orig_self = reg_cfp->self;\n"
src << " reg_cfp->self = stack[#{stack_size + sp_inc - 1}];\n"
src << " stack[#{stack_size + sp_inc - 1}] = _mjit#{status.compiled_id}_inlined_#{pos}(ec, reg_cfp, orig_self, original_iseq);\n"
src << " reg_cfp->self = orig_self;\n"
src << " }\n"
else
# JIT: Forked `vm_sendish` (except method_explorer = vm_search_method_wrap) to inline various things
src << " {\n"
src << " VALUE val;\n"
src << " struct rb_calling_info calling;\n"
if insn.name == :send
src << " calling.block_handler = vm_caller_setup_arg_block(ec, reg_cfp, (const struct rb_callinfo *)#{ci}, (rb_iseq_t *)0x#{operands[1].to_s(16)}, FALSE);\n"
else
src << " calling.block_handler = VM_BLOCK_HANDLER_NONE;\n"
end
src << " calling.kw_splat = #{kw_splat ? 1 : 0};\n"
src << " calling.recv = stack[#{stack_size + sp_inc - 1}];\n"
src << " calling.argc = #{C.vm_ci_argc(ci)};\n"
if vm_cc_cme(captured_cc).def.type == C.VM_METHOD_TYPE_CFUNC
# TODO: optimize this more
src << " calling.ci = (const struct rb_callinfo *)#{ci};\n" # creating local cd here because operand's cd->cc may not be the same as inlined cc.
src << " calling.cc = cc;"
src << " val = vm_call_cfunc_with_frame(ec, reg_cfp, &calling);\n"
else # :iseq
# fastpath_applied_iseq_p checks rb_simple_iseq_p, which ensures has_opt == FALSE
src << " vm_call_iseq_setup_normal(ec, reg_cfp, &calling, cc_cme, 0, #{iseq.body.param.size}, #{iseq.body.local_table_size});\n"
if iseq.body.catch_except_p
src << " VM_ENV_FLAGS_SET(ec->cfp->ep, VM_FRAME_FLAG_FINISH);\n"
src << " val = vm_exec(ec, true);\n"
else
src << " if ((val = jit_exec(ec)) == Qundef) {\n"
src << " VM_ENV_FLAGS_SET(ec->cfp->ep, VM_FRAME_FLAG_FINISH);\n" # This is vm_call0_body's code after vm_call_iseq_setup
src << " val = vm_exec(ec, false);\n"
src << " }\n"
end
end
src << " stack[#{stack_size + sp_inc - 1}] = val;\n"
src << " }\n"
# JIT: We should evaluate ISeq modified for TracePoint if it's enabled. Note: This is slow.
src << " if (UNLIKELY(!mjit_call_p)) {\n"
src << " reg_cfp->sp = vm_base_ptr(reg_cfp) + #{stack_size + sp_inc};\n"
if !pc_moved_p
src << " reg_cfp->pc = original_body_iseq + #{next_pos};\n"
end
src << " goto cancel;\n"
src << " }\n"
end
src << "}\n"
return src
else
return nil
end
end
def compile_ivar(insn_name, stack_size, pos, status, operands, body)
iv_cache = C.iseq_inline_storage_entry.new(operands[1]).iv_cache
dest_shape_id = iv_cache.value >> C.SHAPE_FLAG_SHIFT
source_shape_id = parent_shape_id(dest_shape_id)
attr_index = iv_cache.value & ((1 << C.SHAPE_FLAG_SHIFT) - 1)
src = +''
if !status.compile_info.disable_ivar_cache && source_shape_id != C.INVALID_SHAPE_ID
# JIT: optimize away motion of sp and pc. This path does not call rb_warning() and so it's always leaf and not `handles_sp`.
# compile_pc_and_sp(src, insn, stack_size, sp_inc, local_stack_p, next_pos)
# JIT: prepare vm_getivar/vm_setivar arguments and variables
src << "{\n"
src << " VALUE obj = GET_SELF();\n" # T_OBJECT guaranteed by compile_body
# JIT: cache hit path of vm_getivar/vm_setivar, or cancel JIT (recompile it with exivar)
if insn_name == :setinstancevariable
src << " const uint32_t index = #{attr_index - 1};\n"
src << " const shape_id_t dest_shape_id = (shape_id_t)#{dest_shape_id};\n"
src << " if (dest_shape_id == ROBJECT_SHAPE_ID(obj)) {\n"
src << " VALUE *ptr = ROBJECT_IVPTR(obj);\n"
src << " RB_OBJ_WRITE(obj, &ptr[index], stack[#{stack_size - 1}]);\n"
src << " }\n"
else
src << " const shape_id_t source_shape_id = (shape_id_t)#{dest_shape_id};\n"
if attr_index == 0 # cache hit, but uninitialized iv
src << " /* Uninitialized instance variable */\n"
src << " if (source_shape_id == ROBJECT_SHAPE_ID(obj)) {\n"
src << " stack[#{stack_size}] = Qnil;\n"
src << " }\n"
else
src << " const uint32_t index = #{attr_index - 1};\n"
src << " if (source_shape_id == ROBJECT_SHAPE_ID(obj)) {\n"
src << " stack[#{stack_size}] = ROBJECT_IVPTR(obj)[index];\n"
src << " }\n"
end
end
src << " else {\n"
src << " reg_cfp->pc = original_body_iseq + #{pos};\n"
src << " reg_cfp->sp = vm_base_ptr(reg_cfp) + #{stack_size};\n"
src << " goto ivar_cancel;\n"
src << " }\n"
src << "}\n"
return src
elsif insn_name == :getinstancevariable && !status.compile_info.disable_exivar_cache && source_shape_id != C.INVALID_SHAPE_ID
# JIT: optimize away motion of sp and pc. This path does not call rb_warning() and so it's always leaf and not `handles_sp`.
# compile_pc_and_sp(src, insn, stack_size, sp_inc, local_stack_p, next_pos)
# JIT: prepare vm_getivar's arguments and variables
src << "{\n"
src << " VALUE obj = GET_SELF();\n"
src << " const shape_id_t source_shape_id = (shape_id_t)#{dest_shape_id};\n"
src << " const uint32_t index = #{attr_index - 1};\n"
# JIT: cache hit path of vm_getivar, or cancel JIT (recompile it without any ivar optimization)
src << " struct gen_ivtbl *ivtbl;\n"
src << " if (LIKELY(FL_TEST_RAW(GET_SELF(), FL_EXIVAR) && source_shape_id == rb_shape_get_shape_id(obj) && rb_ivar_generic_ivtbl_lookup(obj, &ivtbl))) {\n"
src << " stack[#{stack_size}] = ivtbl->ivptr[index];\n"
src << " }\n"
src << " else {\n"
src << " reg_cfp->pc = original_body_iseq + #{pos};\n"
src << " reg_cfp->sp = vm_base_ptr(reg_cfp) + #{stack_size};\n"
src << " goto exivar_cancel;\n"
src << " }\n"
src << "}\n"
return src
else
return nil
end
end
def compile_invokebuiltin(insn, stack_size, sp_inc, body, operands)
bf = C.RB_BUILTIN.new(operands[0])
if bf.compiler > 0
index = (insn.name == :invokebuiltin ? -1 : operands[1])
src = +"{\n"
src << " VALUE val;\n"
C.builtin_compiler(src, bf, index, stack_size, body.builtin_inline_p)
src << " stack[#{stack_size + sp_inc - 1}] = val;\n"
src << "}\n"
return src
else
return nil
end
end
def compile_leave(stack_size, pos, inlined_iseq_p)
src = +''
# Skip vm_pop_frame for inlined call
unless inlined_iseq_p
# Cancel on interrupts to make leave insn leaf
src << " if (UNLIKELY(RUBY_VM_INTERRUPTED_ANY(ec))) {\n"
src << " reg_cfp->sp = vm_base_ptr(reg_cfp) + #{stack_size};\n"
src << " reg_cfp->pc = original_body_iseq + #{pos};\n"
src << " rb_threadptr_execute_interrupts(rb_ec_thread_ptr(ec), 0);\n"
src << " }\n"
src << " ec->cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(reg_cfp);\n" # vm_pop_frame
end
src << " return stack[0];\n"
end
def compile_getconstant_path(stack_size, pos, insn_len, operands, status)
ice = C.IC.new(operands[0]).entry
if !status.compile_info.disable_const_cache && ice
# JIT: Inline everything in IC, and cancel the slow path
src = +" if (vm_inlined_ic_hit_p(#{ice.flags}, #{ice.value}, (const rb_cref_t *)#{to_addr(ice.ic_cref)}, reg_cfp->ep)) {\n"
src << " stack[#{stack_size}] = #{ice.value};\n"
src << " }\n"
src << " else {\n"
src << " reg_cfp->sp = vm_base_ptr(reg_cfp) + #{stack_size};\n"
src << " reg_cfp->pc = original_body_iseq + #{pos};\n"
src << " goto const_cancel;\n"
src << " }\n"
return src
else
return nil
end
end
def compile_insn_default(insn, stack_size, sp_inc, local_stack_p, pos, next_pos, insn_len, inlined_iseq_p, operands)
src = +''
finish_p = false
compile_insns = false
# JIT: Declare stack_size to be used in some macro of _mjit_compile_insn_body.erb
src << "{\n"
if local_stack_p
src << " MAYBE_UNUSED(unsigned int) stack_size = #{stack_size};\n"
end
# JIT: Declare variables for operands, popped values and return values
insn.declarations.each do |decl|
src << " #{decl};\n"
end
# JIT: Set const expressions for `RubyVM::OperandsUnifications` insn
insn.preamble.each do |amble|
src << "#{amble.sub(/const \S+\s+/, '')}\n"
end
# JIT: Initialize operands
insn.opes.each_with_index do |ope, i|
src << " #{ope.fetch(:name)} = (#{ope.fetch(:type)})#{operands[i]};\n"
# TODO: resurrect comment_id
end
# JIT: Initialize popped values
insn.pops.reverse_each.with_index.reverse_each do |pop, i|
src << " #{pop.fetch(:name)} = stack[#{stack_size - (i + 1)}];\n"
end
# JIT: move sp and pc if necessary
pc_moved_p = compile_pc_and_sp(src, insn, stack_size, sp_inc, local_stack_p, next_pos)
# JIT: Print insn body in insns.def
next_pos = compile_insn_body(src, insn, pos, next_pos, insn_len, local_stack_p, stack_size, sp_inc, operands)
# JIT: Set return values
insn.rets.reverse_each.with_index do |ret, i|
# TOPN(n) = ...
src << " stack[#{stack_size + sp_inc - (i + 1)}] = #{ret.fetch(:name)};\n"
end
# JIT: We should evaluate ISeq modified for TracePoint if it's enabled. Note: This is slow.
# leaf insn may not cancel JIT. leaf_without_check_ints is covered in RUBY_VM_CHECK_INTS of _mjit_compile_insn_body.erb.
unless insn.always_leaf? || insn.leaf_without_check_ints?
src << " if (UNLIKELY(!mjit_call_p)) {\n"
src << " reg_cfp->sp = vm_base_ptr(reg_cfp) + #{stack_size + sp_inc};\n"
if !pc_moved_p
src << " reg_cfp->pc = original_body_iseq + #{next_pos};\n"
end
src << " goto cancel;\n"
src << " }\n"
end
src << "}\n"
# compiler: If insn has conditional JUMP, the code should go to the branch not targeted by JUMP next.
if insn.expr.match?(/if\s+\([^{}]+\)\s+\{[^{}]+JUMP\([^)]+\);[^{}]+\}/)
compile_insns = true
end
# compiler: If insn returns (leave) or does longjmp (throw), the branch should no longer be compiled. TODO: create attr for it?
if insn.expr.match?(/\sTHROW_EXCEPTION\([^)]+\);/) || insn.expr.match?(/\bvm_pop_frame\(/)
finish_p = true
end
return src, next_pos, finish_p, compile_insns
end
def compile_insn_body(src, insn, pos, next_pos, insn_len, local_stack_p, stack_size, sp_inc, operands)
# Print a body of insn, but with macro expansion.
expand_simple_macros(insn.expr).each_line do |line|
# Expand dynamic macro here
# TODO: support combination of following macros in the same line
case line
when /\A\s+RUBY_VM_CHECK_INTS\(ec\);\s+\z/
if insn.leaf_without_check_ints? # lazily move PC and optionalize mjit_call_p here
src << " if (UNLIKELY(RUBY_VM_INTERRUPTED_ANY(ec))) {\n"
src << " reg_cfp->pc = original_body_iseq + #{next_pos};\n" # ADD_PC(INSN_ATTR(width));
src << " rb_threadptr_execute_interrupts(rb_ec_thread_ptr(ec), 0);\n"
src << " if (UNLIKELY(!mjit_call_p)) {\n"
src << " reg_cfp->sp = vm_base_ptr(reg_cfp) + #{stack_size};\n"
src << " goto cancel;\n"
src << " }\n"
src << " }\n"
else
src << to_cstr(line)
end
when /\A\s+JUMP\((?<dest>[^)]+)\);\s+\z/
dest = Regexp.last_match[:dest]
if insn.name == :opt_case_dispatch # special case... TODO: use another macro to avoid checking name
hash_offsets = C.rb_hash_values(operands[0]).uniq
else_offset = cast_offset(operands[1])
base_pos = pos + insn_len
src << " switch (#{dest}) {\n"
hash_offsets.each do |offset|
src << " case #{offset}:\n"
src << " goto label_#{base_pos + offset};\n"
end
src << " case #{else_offset}:\n"
src << " goto label_#{base_pos + else_offset};\n"
src << " }\n"
else
# Before we `goto` next insn, we need to set return values, especially for getinlinecache
insn.rets.reverse_each.with_index do |ret, i|
# TOPN(n) = ...
src << " stack[#{stack_size + sp_inc - (i + 1)}] = #{ret.fetch(:name)};\n"
end
next_pos = pos + insn_len + cast_offset(operands[0]) # workaround: assuming dest == operands[0]. TODO: avoid relying on it
src << " goto label_#{next_pos};\n"
end
when /\A\s+CALL_SIMPLE_METHOD\(\);\s+\z/
# For `opt_xxx`'s fallbacks.
if local_stack_p
src << " reg_cfp->sp = vm_base_ptr(reg_cfp) + #{stack_size};\n"
end
src << " reg_cfp->pc = original_body_iseq + #{pos};\n"
src << " goto cancel;\n"
when /\A(?<prefix>.+\b)INSN_LABEL\((?<name>[^)]+)\)(?<suffix>.+)\z/m
prefix, name, suffix = Regexp.last_match[:prefix], Regexp.last_match[:name], Regexp.last_match[:suffix]
src << "#{prefix}INSN_LABEL(#{name}_#{pos})#{suffix}"
else
if insn.handles_sp?
# If insn.handles_sp? is true, cfp->sp might be changed inside insns (like vm_caller_setup_arg_block)
# and thus we need to use cfp->sp, even when local_stack_p is TRUE. When insn.handles_sp? is true,
# cfp->sp should be available too because _mjit_compile_pc_and_sp.erb sets it.
src << to_cstr(line)
else
# If local_stack_p is TRUE and insn.handles_sp? is false, stack values are only available in local variables
# for stack. So we need to replace those macros if local_stack_p is TRUE here.
case line
when /\bGET_SP\(\)/
# reg_cfp->sp
src << to_cstr(line.sub(/\bGET_SP\(\)/, local_stack_p ? '(stack + stack_size)' : 'GET_SP()'))
when /\bSTACK_ADDR_FROM_TOP\((?<num>[^)]+)\)/
# #define STACK_ADDR_FROM_TOP(n) (GET_SP()-(n))
num = Regexp.last_match[:num]
src << to_cstr(line.sub(/\bSTACK_ADDR_FROM_TOP\(([^)]+)\)/, local_stack_p ? "(stack + (stack_size - (#{num})))" : "STACK_ADDR_FROM_TOP(#{num})"))
when /\bTOPN\((?<num>[^)]+)\)/
# #define TOPN(n) (*(GET_SP()-(n)-1))
num = Regexp.last_match[:num]
src << to_cstr(line.sub(/\bTOPN\(([^)]+)\)/, local_stack_p ? "*(stack + (stack_size - (#{num}) - 1))" : "TOPN(#{num})"))
else
src << to_cstr(line)
end
end
end
end
return next_pos
end
def compile_pc_and_sp(src, insn, stack_size, sp_inc, local_stack_p, next_pos)
# JIT: When an insn is leaf, we don't need to Move pc for a catch table on catch_except_p, #caller_locations,
# and rb_profile_frames. For check_ints, we lazily move PC when we have interruptions.
pc_moved_p = false
unless insn.always_leaf? || insn.leaf_without_check_ints?
src << " reg_cfp->pc = original_body_iseq + #{next_pos};\n" # ADD_PC(INSN_ATTR(width));
pc_moved_p = true
end
# JIT: move sp to use or preserve stack variables
if local_stack_p
# sp motion is optimized away for `handles_sp? #=> false` case.
# Thus sp should be set properly before `goto cancel`.
if insn.handles_sp?
# JIT-only behavior (pushing JIT's local variables to VM's stack):
push_size = -sp_inc + insn.rets.size - insn.pops.size
src << " reg_cfp->sp = vm_base_ptr(reg_cfp) + #{push_size};\n"
push_size.times do |i|
src << " *(reg_cfp->sp + #{i - push_size}) = stack[#{stack_size - push_size + i}];\n"
end
end
else
if insn.handles_sp?
src << " reg_cfp->sp = vm_base_ptr(reg_cfp) + #{stack_size - insn.pops.size};\n" # POPN(INSN_ATTR(popn));
else
src << " reg_cfp->sp = vm_base_ptr(reg_cfp) + #{stack_size};\n"
end
end
return pc_moved_p
end
# Print the block to cancel inlined method call. It's supporting only `opt_send_without_block` for now.
def compile_inlined_cancel_handler(src, body, inline_context)
src << "\ncancel:\n"
src << " rb_mjit_recompile_inlining(original_iseq);\n"
# Swap pc/sp set on cancel with original pc/sp.
src << " const VALUE *current_pc = reg_cfp->pc;\n"
src << " VALUE *current_sp = reg_cfp->sp;\n"
src << " reg_cfp->pc = orig_pc;\n"
src << " reg_cfp->sp = orig_sp;\n\n"
# Lazily push the current call frame.
src << " struct rb_calling_info calling;\n"
src << " calling.block_handler = VM_BLOCK_HANDLER_NONE;\n" # assumes `opt_send_without_block`
src << " calling.argc = #{inline_context.orig_argc};\n"
src << " calling.recv = reg_cfp->self;\n"
src << " reg_cfp->self = orig_self;\n"
# fastpath_applied_iseq_p checks rb_simple_iseq_p, which ensures has_opt == FALSE
src << " vm_call_iseq_setup_normal(ec, reg_cfp, &calling, (const rb_callable_method_entry_t *)#{inline_context.me}, 0, #{inline_context.param_size}, #{inline_context.local_size});\n\n"
# Start usual cancel from here.
src << " reg_cfp = ec->cfp;\n" # work on the new frame
src << " reg_cfp->pc = current_pc;\n"
src << " reg_cfp->sp = current_sp;\n"
(0...body.stack_max).each do |i| # should be always `status->local_stack_p`
src << " *(vm_base_ptr(reg_cfp) + #{i}) = stack[#{i}];\n"
end
# We're not just returning Qundef here so that caller's normal cancel handler can
# push back `stack` to `cfp->sp`.
src << " return vm_exec(ec, false);\n"
end
# Print the block to cancel JIT execution.
def compile_cancel_handler(src, body, status)
if status.inlined_iseqs.nil? # the current ISeq is being inlined
compile_inlined_cancel_handler(src, body, status.inline_context)
return
end
src << "\nsend_cancel:\n"
src << " rb_mjit_recompile_send(original_iseq);\n"
src << " goto cancel;\n"
src << "\nivar_cancel:\n"
src << " rb_mjit_recompile_ivar(original_iseq);\n"
src << " goto cancel;\n"
src << "\nexivar_cancel:\n"
src << " rb_mjit_recompile_exivar(original_iseq);\n"
src << " goto cancel;\n"
src << "\nconst_cancel:\n"
src << " rb_mjit_recompile_const(original_iseq);\n"
src << " goto cancel;\n"
src << "\ncancel:\n"
if status.local_stack_p
(0...body.stack_max).each do |i|
src << " *(vm_base_ptr(reg_cfp) + #{i}) = stack[#{i}];\n"
end
end
src << " return Qundef;\n"
end
def precompile_inlinable_child_iseq(src, child_iseq, status, ci, cc, pos)
child_status = C.compile_status.new # not freed for now
child_status.compiled_iseq = status.compiled_iseq
child_status.compiled_id = status.compiled_id
init_compile_status(child_status, child_iseq.body, false) # not freed for now
child_status.inline_context.orig_argc = C.vm_ci_argc(ci)
child_status.inline_context.me = vm_cc_cme(cc).to_i
child_status.inline_context.param_size = child_iseq.body.param.size
child_status.inline_context.local_size = child_iseq.body.local_table_size
if child_iseq.body.ci_size > 0 && child_status.cc_entries_index == -1
return false
end
src << "ALWAYS_INLINE(static VALUE _mjit#{status.compiled_id}_inlined_#{pos}(rb_execution_context_t *ec, rb_control_frame_t *reg_cfp, const VALUE orig_self, const rb_iseq_t *original_iseq));\n"
src << "static inline VALUE\n_mjit#{status.compiled_id}_inlined_#{pos}(rb_execution_context_t *ec, rb_control_frame_t *reg_cfp, const VALUE orig_self, const rb_iseq_t *original_iseq)\n{\n"
src << " const VALUE *orig_pc = reg_cfp->pc;\n"
src << " VALUE *orig_sp = reg_cfp->sp;\n"
success = compile_body(src, child_iseq, child_status)
src << "\n} /* end of _mjit#{status.compiled_id}_inlined_#{pos} */\n\n"
return success;
end
def precompile_inlinable_iseqs(src, iseq, status)
body = iseq.body
pos = 0
while pos < body.iseq_size
insn = INSNS.fetch(C.rb_vm_insn_decode(body.iseq_encoded[pos]))
if insn.name == :opt_send_without_block || insn.name == :opt_size # `compile_inlined_cancel_handler` supports only `opt_send_without_block`
cd = C.CALL_DATA.new(body.iseq_encoded[pos + 1])
ci = cd.ci
cc = captured_cc_entries(status)[call_data_index(cd, body)] # use copy to avoid race condition
if (child_iseq = rb_mjit_inlinable_iseq(ci, cc)) != nil
status.inlined_iseqs[pos] = child_iseq.body
if C.mjit_opts.verbose >= 1 # print beforehand because ISeq may be GCed during copy job.
child_location = child_iseq.body.location
$stderr.puts "JIT inline: #{child_location.label}@#{C.rb_iseq_path(child_iseq)}:#{C.rb_iseq_first_lineno(child_iseq)} " \
"=> #{iseq.body.location.label}@#{C.rb_iseq_path(iseq)}:#{C.rb_iseq_first_lineno(iseq)}"
end
if !precompile_inlinable_child_iseq(src, child_iseq, status, ci, cc, pos)
return false
end
end
end
pos += insn.len
end
return true
end
def init_compile_status(status, body, compile_root_p)
status.stack_size_for_pos = Fiddle.malloc(Fiddle::SIZEOF_INT * body.iseq_size)
body.iseq_size.times do |i|
status.stack_size_for_pos[i] = C.NOT_COMPILED_STACK_SIZE
end
if compile_root_p
status.inlined_iseqs = Fiddle.malloc(Fiddle::SIZEOF_VOIDP * body.iseq_size)
body.iseq_size.times do |i|
status.inlined_iseqs[i] = nil
end
end
if body.ci_size > 0
status.cc_entries_index = C.mjit_capture_cc_entries(status.compiled_iseq, body)
else
status.cc_entries_index = -1
end
if compile_root_p
status.compile_info = rb_mjit_iseq_compile_info(body)
else
status.compile_info = Fiddle.malloc(C.rb_mjit_compile_info.sizeof)
status.compile_info.disable_ivar_cache = false
status.compile_info.disable_exivar_cache = false
status.compile_info.disable_send_cache = false
status.compile_info.disable_inlining = false
status.compile_info.disable_const_cache = false
end
end
def using_ivar?(body)
pos = 0
while pos < body.iseq_size
insn = INSNS.fetch(C.rb_vm_insn_decode(body.iseq_encoded[pos]))
case insn.name
when :getinstancevariable, :setinstancevariable
return true
end
pos += insn.len
end
return false
end
# Expand simple macro that doesn't require dynamic C code.
def expand_simple_macros(arg_expr)
arg_expr.dup.tap do |expr|
# For `leave`. We can't proceed next ISeq in the same JIT function.
expr.gsub!(/^(?<indent>\s*)RESTORE_REGS\(\);\n/) do
indent = Regexp.last_match[:indent]
<<-end.gsub(/^ {12}/, '')
#if OPT_CALL_THREADED_CODE
#{indent}rb_ec_thread_ptr(ec)->retval = val;
#{indent}return 0;
#else
#{indent}return val;
#endif
end
end
expr.gsub!(/^(?<indent>\s*)NEXT_INSN\(\);\n/) do
indent = Regexp.last_match[:indent]
<<-end.gsub(/^ {12}/, '')
#{indent}UNREACHABLE_RETURN(Qundef);
end
end
end
end
def to_cstr(expr)
expr.gsub(/^(?!#)/, ' ') # indent everything but preprocessor lines
end
# Interpret unsigned long as signed long (VALUE -> OFFSET)
def cast_offset(offset)
if offset >= 1 << 8 * Fiddle::SIZEOF_VOIDP - 1 # negative
offset -= 1 << 8 * Fiddle::SIZEOF_VOIDP
end
offset
end
def captured_cc_entries(status)
status.compiled_iseq.mjit_unit.cc_entries + status.cc_entries_index
end
def call_data_index(cd, body)
cd - body.call_data
end
def vm_cc_cme(cc)
# TODO: add VM_ASSERT like actual vm_cc_cme
cc.cme_
end
def def_iseq_ptr(method_def)
C.rb_iseq_check(method_def.body.iseq.iseqptr)
end
def rb_mjit_iseq_compile_info(body)
body.mjit_unit.compile_info
end
def ISEQ_IS_SIZE(body)
body.ic_size + body.ivc_size + body.ise_size + body.icvarc_size
end
# Return true if an object of the class may be a special const (immediate).
# It's "maybe" because Integer and Float are not guaranteed to be an immediate.
# If this returns false, rb_class_of could be optimzied to RBASIC_CLASS.
def maybe_special_const?(klass)
[
C.rb_cFalseClass,
C.rb_cNilClass,
C.rb_cTrueClass,
C.rb_cInteger,
C.rb_cSymbol,
C.rb_cFloat,
].include?(klass)
end
def has_valid_method_type?(cc)
vm_cc_cme(cc) != nil
end
def already_compiled?(status, pos)
status.stack_size_for_pos[pos] != C.NOT_COMPILED_STACK_SIZE
end
# Return an iseq pointer if cc has inlinable iseq.
def rb_mjit_inlinable_iseq(ci, cc)
if has_valid_method_type?(cc) &&
C.vm_ci_flag(ci) & C.VM_CALL_TAILCALL == 0 && # inlining only non-tailcall path
vm_cc_cme(cc).def.type == C.VM_METHOD_TYPE_ISEQ &&
C.fastpath_applied_iseq_p(ci, cc, iseq = def_iseq_ptr(vm_cc_cme(cc).def)) &&
inlinable_iseq_p(iseq.body) # CC_SET_FASTPATH in vm_callee_setup_arg
return iseq
end
return nil
end
# Return true if the ISeq can be inlined without pushing a new control frame.
def inlinable_iseq_p(body)
# 1) If catch_except_p, caller frame should be preserved when callee catches an exception.
# Then we need to wrap `vm_exec()` but then we can't inline the call inside it.
#
# 2) If `body->catch_except_p` is false and `handles_sp?` of an insn is false,
# sp is not moved as we assume `status->local_stack_p = !body->catch_except_p`.
#
# 3) If `body->catch_except_p` is false and `always_leaf?` of an insn is true,
# pc is not moved.
if body.catch_except_p
return false
end
pos = 0
while pos < body.iseq_size
insn = INSNS.fetch(C.rb_vm_insn_decode(body.iseq_encoded[pos]))
# All insns in the ISeq except `leave` (to be overridden in the inlined code)
# should meet following strong assumptions:
# * Do not require `cfp->sp` motion
# * Do not move `cfp->pc`
# * Do not read any `cfp->pc`
if insn.name == :invokebuiltin || insn.name == :opt_invokebuiltin_delegate || insn.name == :opt_invokebuiltin_delegate_leave
# builtin insn's inlinability is handled by `Primitive.attr! 'inline'` per iseq
if !body.builtin_inline_p
return false;
end
elsif insn.name != :leave && C.insn_may_depend_on_sp_or_pc(insn.bin, body.iseq_encoded + (pos + 1))
return false
end
# At this moment, `cfp->ep` in an inlined method is not working.
case insn.name
when :getlocal,
:getlocal_WC_0,
:getlocal_WC_1,
:setlocal,
:setlocal_WC_0,
:setlocal_WC_1,
:getblockparam,
:getblockparamproxy,
:setblockparam
return false
end
pos += insn.len
end
return true
end
# CPointer::Struct could be nil on field reference, and this is a helper to
# handle that case while using CPointer::Struct#to_s in most cases.
# @param struct [RubyVM::MJIT::CPointer::Struct]
def to_addr(struct)
struct&.to_s || 'NULL'
end
def parent_shape_id(shape_id)
return shape_id if shape_id == C.INVALID_SHAPE_ID
parent_id = C.rb_shape_get_shape_by_id(shape_id).parent_id
parent = C.rb_shape_get_shape_by_id(parent_id)
if parent.type == C.SHAPE_CAPACITY_CHANGE
parent.parent_id
else
parent_id
end
def compile(iseq)
# TODO: implement
end
end

9
mjit.c
Просмотреть файл

@ -366,6 +366,7 @@ mjit_compile(FILE *f, const rb_iseq_t *iseq, const char *funcname, int id)
return false;
}
//================================================================================
//
// New stuff from here
//
@ -373,7 +374,13 @@ mjit_compile(FILE *f, const rb_iseq_t *iseq, const char *funcname, int id)
void
rb_mjit_compile(const rb_iseq_t *iseq)
{
// TODO: implement
bool original_call_p = mjit_call_p;
mjit_call_p = false; // Avoid impacting JIT metrics by itself
VALUE iseq_ptr = rb_funcall(rb_cMJITIseqPtr, rb_intern("new"), 1, SIZET2NUM((size_t)iseq));
rb_funcall(rb_cMJITCompiler, rb_intern("compile"), 1, iseq_ptr);
mjit_call_p = original_call_p;
}
void

26
vm.c
Просмотреть файл

@ -382,32 +382,6 @@ extern VALUE rb_vm_invoke_bmethod(rb_execution_context_t *ec, rb_proc_t *proc, V
static VALUE vm_invoke_proc(rb_execution_context_t *ec, rb_proc_t *proc, VALUE self, int argc, const VALUE *argv, int kw_splat, VALUE block_handler);
#if USE_MJIT || USE_YJIT
# ifdef MJIT_HEADER
NOINLINE(static COLDFUNC VALUE mjit_check_iseq(rb_execution_context_t *ec, const rb_iseq_t *iseq, struct rb_iseq_constant_body *body));
# else
static inline VALUE mjit_check_iseq(rb_execution_context_t *ec, const rb_iseq_t *iseq, struct rb_iseq_constant_body *body);
# endif
static VALUE
mjit_check_iseq(rb_execution_context_t *ec, const rb_iseq_t *iseq, struct rb_iseq_constant_body *body)
{
uintptr_t mjit_state = (uintptr_t)(body->jit_func);
ASSUME(MJIT_FUNC_STATE_P(mjit_state));
switch ((enum rb_mjit_func_state)mjit_state) {
case MJIT_FUNC_NOT_COMPILED:
if (body->total_calls == mjit_opts.call_threshold) {
rb_mjit_compile(iseq);
if (UNLIKELY(mjit_opts.wait && !MJIT_FUNC_STATE_P(body->jit_func))) {
return body->jit_func(ec, ec->cfp);
}
}
break;
case MJIT_FUNC_COMPILING:
case MJIT_FUNC_FAILED:
break;
}
return Qundef;
}
// Try to execute the current iseq in ec. Use JIT code if it is ready.
// If it is not, add ISEQ to the compilation queue and return Qundef for MJIT.
// YJIT compiles on the thread running the iseq.