summaryrefslogtreecommitdiff
path: root/lib/ruby_vm/mjit/x86_assembler.rb
diff options
context:
space:
mode:
authorTakashi Kokubun <[email protected]>2022-12-30 22:16:07 -0800
committerTakashi Kokubun <[email protected]>2023-03-05 22:11:20 -0800
commit36cec59f0a54b817ae6b3836fb0e97e342b999ce (patch)
tree2978e1388c2c093a521456a9c08cf507ca0df7e0 /lib/ruby_vm/mjit/x86_assembler.rb
parent7abff797b434ead0653c89f5429490bd0f716f88 (diff)
Implement ocb
Diffstat (limited to 'lib/ruby_vm/mjit/x86_assembler.rb')
-rw-r--r--lib/ruby_vm/mjit/x86_assembler.rb390
1 files changed, 0 insertions, 390 deletions
diff --git a/lib/ruby_vm/mjit/x86_assembler.rb b/lib/ruby_vm/mjit/x86_assembler.rb
deleted file mode 100644
index 9856d4e4ac..0000000000
--- a/lib/ruby_vm/mjit/x86_assembler.rb
+++ /dev/null
@@ -1,390 +0,0 @@
-# frozen_string_literal: true
-# https://www.intel.com/content/dam/develop/public/us/en/documents/325383-sdm-vol-2abcd.pdf
-module RubyVM::MJIT
- class X86Assembler
- class Label < Data.define(:id, :name); end
-
- ByteWriter = CType::Immediate.parse('char')
-
- ### prefix ###
- # REX = 0100WR0B
- REX_W = 0b01001000
-
- def initialize
- @bytes = []
- @labels = {}
- @label_id = 0
- @comments = Hash.new { |h, k| h[k] = [] }
- end
-
- def assemble(addr)
- link_labels
- writer = ByteWriter.new(addr)
- # If you pack bytes containing \x00, Ruby fails to recognize bytes after \x00.
- # So writing byte by byte to avoid hitting that situation.
- @bytes.each_with_index do |byte, index|
- writer[index] = byte
- end
- @bytes.size
- ensure
- @bytes.clear
- end
-
- def size
- @bytes.size
- end
-
- #
- # Instructions
- #
-
- def add(dst, src)
- case [dst, src]
- # ADD r/m64, imm8 (Mod 11)
- in [Symbol => dst_reg, Integer => src_imm] if r64?(dst_reg) && imm8?(src_imm)
- # REX.W + 83 /0 ib
- # MI: Operand 1: ModRM:r/m (r, w), Operand 2: imm8/16/32
- insn(
- prefix: REX_W,
- opcode: 0x83,
- mod_rm: mod_rm(mod: 0b11, rm: reg_code(dst_reg)),
- imm: imm8(src_imm),
- )
- # ADD r/m64, imm8 (Mod 00)
- in [[Symbol => dst_reg], Integer => src_imm] if r64?(dst_reg) && imm8?(src_imm)
- # REX.W + 83 /0 ib
- # MI: Operand 1: ModRM:r/m (r, w), Operand 2: imm8/16/32
- insn(
- prefix: REX_W,
- opcode: 0x83,
- mod_rm: mod_rm(mod: 0b00, rm: reg_code(dst_reg)), # Mod 00: [reg]
- imm: imm8(src_imm),
- )
- else
- raise NotImplementedError, "add: not-implemented operands: #{dst.inspect}, #{src.inspect}"
- end
- end
-
- # JZ rel8
- # @param [RubyVM::MJIT::X86Assembler::Label] label
- def jz(label)
- # 74 cb
- insn(opcode: 0x74)
- @bytes.push(label)
- end
-
- def mov(dst, src)
- case dst
- in Symbol => dst_reg
- case src
- # MOV r64, r/m64 (Mod 00)
- in [Symbol => src_reg] if r64?(dst_reg) && r64?(src_reg)
- # REX.W + 8B /r
- # RM: Operand 1: ModRM:reg (w), Operand 2: ModRM:r/m (r)
- insn(
- prefix: REX_W,
- opcode: 0x8b,
- mod_rm: mod_rm(mod: 0b00, reg: reg_code(dst_reg), rm: reg_code(src_reg)), # Mod 00: [reg]
- )
- # MOV r32 r/m32 (Mod 01)
- in [Symbol => src_reg, Integer => src_disp] if r32?(dst_reg) && imm8?(src_disp)
- # 8B /r
- # RM: Operand 1: ModRM:reg (w), Operand 2: ModRM:r/m (r)
- insn(
- opcode: 0x8b,
- mod_rm: mod_rm(mod: 0b01, reg: reg_code(dst_reg), rm: reg_code(src_reg)), # Mod 01: [reg]+disp8
- disp: src_disp,
- )
- # MOV r64, r/m64 (Mod 01)
- in [Symbol => src_reg, Integer => src_disp] if r64?(dst_reg) && r64?(src_reg) && imm8?(src_disp)
- # REX.W + 8B /r
- # RM: Operand 1: ModRM:reg (w), Operand 2: ModRM:r/m (r)
- insn(
- prefix: REX_W,
- opcode: 0x8b,
- mod_rm: mod_rm(mod: 0b01, reg: reg_code(dst_reg), rm: reg_code(src_reg)), # Mod 01: [reg]+disp8
- disp: src_disp,
- )
- # MOV r/m64, imm32 (Mod 11)
- in Integer => src_imm if r64?(dst_reg) && imm32?(src_imm)
- # REX.W + C7 /0 id
- # MI: Operand 1: ModRM:r/m (w), Operand 2: imm8/16/32/64
- insn(
- prefix: REX_W,
- opcode: 0xc7,
- mod_rm: mod_rm(mod: 0b11, rm: reg_code(dst_reg)), # Mod 11: reg
- imm: imm32(src_imm),
- )
- # MOV r64, imm64
- in Integer => src_imm if r64?(dst_reg) && imm64?(src_imm)
- # REX.W + B8+ rd io
- # OI: Operand 1: opcode + rd (w), Operand 2: imm8/16/32/64
- insn(
- prefix: REX_W,
- opcode: 0xb8 + reg_code(dst_reg),
- imm: imm64(src_imm),
- )
- else
- raise NotImplementedError, "mov: not-implemented operands: #{dst.inspect}, #{src.inspect}"
- end
- in [Symbol => dst_reg]
- case src
- # MOV r/m64, imm32 (Mod 00)
- in Integer => src_imm if r64?(dst_reg) && imm32?(src_imm)
- # REX.W + C7 /0 id
- # MI: Operand 1: ModRM:r/m (w), Operand 2: imm8/16/32/64
- insn(
- prefix: REX_W,
- opcode: 0xc7,
- mod_rm: mod_rm(mod: 0b00, rm: reg_code(dst_reg)), # Mod 00: [reg]
- imm: imm32(src_imm),
- )
- # MOV r/m64, r64 (Mod 00)
- in Symbol => src_reg if r64?(dst_reg) && r64?(src_reg)
- # REX.W + 89 /r
- # MR: Operand 1: ModRM:r/m (w), Operand 2: ModRM:reg (r)
- insn(
- prefix: REX_W,
- opcode: 0x89,
- mod_rm: mod_rm(mod: 0b00, reg: reg_code(src_reg), rm: reg_code(dst_reg)), # Mod 00: [reg]
- )
- else
- raise NotImplementedError, "mov: not-implemented operands: #{dst.inspect}, #{src.inspect}"
- end
- in [Symbol => dst_reg, Integer => dst_disp]
- # Optimize encoding when disp is 0
- return mov([dst_reg], src) if dst_disp == 0
-
- case src
- # MOV r/m64, imm32 (Mod 01)
- in Integer => src_imm if r64?(dst_reg) && imm8?(dst_disp) && imm32?(src_imm)
- # REX.W + C7 /0 id
- # MI: Operand 1: ModRM:r/m (w), Operand 2: imm8/16/32/64
- insn(
- prefix: REX_W,
- opcode: 0xc7,
- mod_rm: mod_rm(mod: 0b01, rm: reg_code(dst_reg)), # Mod 01: [reg]+disp8
- disp: dst_disp,
- imm: imm32(src_imm),
- )
- # MOV r/m64, r64 (Mod 01)
- in Symbol => src_reg if r64?(dst_reg) && imm8?(dst_disp) && r64?(src_reg)
- # REX.W + 89 /r
- # MR: Operand 1: ModRM:r/m (w), Operand 2: ModRM:reg (r)
- insn(
- prefix: REX_W,
- opcode: 0x89,
- mod_rm: mod_rm(mod: 0b01, reg: reg_code(src_reg), rm: reg_code(dst_reg)), # Mod 01: [reg]+disp8
- disp: dst_disp,
- )
- else
- raise NotImplementedError, "mov: not-implemented operands: #{dst.inspect}, #{src.inspect}"
- end
- else
- raise NotImplementedError, "mov: not-implemented operands: #{dst.inspect}, #{src.inspect}"
- end
- end
-
- def push(src)
- case src
- # PUSH r64
- in Symbol => src_reg if r64?(src_reg)
- # 50+rd
- # O: Operand 1: opcode + rd (r)
- insn(opcode: 0x50 + reg_code(src_reg))
- else
- raise NotImplementedError, "push: not-implemented operands: #{src.inspect}"
- end
- end
-
- def pop(dst)
- case dst
- # POP r64
- in Symbol => dst_reg if r64?(dst_reg)
- # 58+ rd
- # O: Operand 1: opcode + rd (r)
- insn(opcode: 0x58 + reg_code(dst_reg))
- else
- raise NotImplementedError, "pop: not-implemented operands: #{dst.inspect}"
- end
- end
-
- # RET
- def ret
- # Near return: A return to a procedure within the current code segment
- insn(opcode: 0xc3)
- end
-
- def test(left, right)
- case [left, right]
- # TEST r/m32, r32 (Mod 11)
- in [Symbol => left_reg, Symbol => right_reg] if r32?(left_reg) && r32?(right_reg)
- # 85 /r
- # MR: Operand 1: ModRM:r/m (r), Operand 2: ModRM:reg (r)
- insn(
- opcode: 0x85,
- mod_rm: mod_rm(mod: 0b11, reg: reg_code(right_reg), rm: reg_code(left_reg)), # Mod 11: reg
- )
- else
- raise NotImplementedError, "pop: not-implemented operands: #{dst.inspect}"
- end
- end
-
- #
- # Utilities
- #
-
- attr_reader :comments
-
- def comment(message)
- @comments[@bytes.size] << message
- end
-
- def new_label(name)
- Label.new(id: @label_id += 1, name:)
- end
-
- # @param [RubyVM::MJIT::X86Assembler::Label] label
- def write_label(label)
- @labels[label] = @bytes.size
- end
-
- def incr_counter(name)
- if C.mjit_opts.stats
- comment("increment counter #{name}")
- mov(:rax, C.rb_mjit_counters[name].to_i)
- add([:rax], 1) # TODO: lock
- end
- end
-
- def imm32?(imm)
- (-0x8000_0000..0x7fff_ffff).include?(imm) # TODO: consider uimm
- end
-
- private
-
- def insn(prefix: nil, opcode:, mod_rm: nil, disp: nil, imm: nil)
- if prefix
- @bytes.push(prefix)
- end
- @bytes.push(opcode)
- if mod_rm
- @bytes.push(mod_rm)
- end
- if disp
- unless imm8?(disp) # TODO: support displacement in 2 or 4 bytes as well
- raise NotImplementedError, "not-implemented disp: #{disp}"
- end
- @bytes.push(disp)
- end
- if imm
- @bytes.push(*imm)
- end
- end
-
- def reg_code(reg)
- case reg
- when :al, :ax, :eax, :rax then 0
- when :cl, :cx, :ecx, :rcx then 1
- when :dl, :dx, :edx, :rdx then 2
- when :bl, :bx, :ebx, :rbx then 3
- when :ah, :sp, :esp, :rsp then 4
- when :ch, :bp, :ebp, :rbp then 5
- when :dh, :si, :esi, :rsi then 6
- when :bh, :di, :edi, :rdi then 7
- else raise ArgumentError, "unexpected reg: #{reg.inspect}"
- end
- end
-
- # Table 2-2. 32-Bit Addressing Forms with the ModR/M Byte
- #
- # 7 6 5 4 3 2 1 0
- # +--+--+--+--+--+--+--+--+
- # | Mod | Reg/ | R/M |
- # | | Opcode | |
- # +--+--+--+--+--+--+--+--+
- #
- # The r/m field can specify a register as an operand or it can be combined
- # with the mod field to encode an addressing mode.
- #
- # /0: R/M is 0 (not used)
- # /r: R/M is a register
- def mod_rm(mod:, reg: 0, rm: 0)
- if mod > 0b11
- raise ArgumentError, "too large Mod: #{mod}"
- end
- if reg > 0b111
- raise ArgumentError, "too large Reg/Opcode: #{reg}"
- end
- if rm > 0b111
- raise ArgumentError, "too large R/M: #{rm}"
- end
- (mod << 6) + (reg << 3) + rm
- end
-
- # ib: 1 byte
- def imm8(imm)
- unless imm8?(imm)
- raise ArgumentError, "unexpected imm8: #{imm}"
- end
- imm_bytes(imm, 1)
- end
-
- # id: 4 bytes
- def imm32(imm)
- unless imm32?(imm)
- raise ArgumentError, "unexpected imm32: #{imm}"
- end
- imm_bytes(imm, 4)
- end
-
- # io: 8 bytes
- def imm64(imm)
- unless imm64?(imm)
- raise ArgumentError, "unexpected imm64: #{imm}"
- end
- imm_bytes(imm, 8)
- end
-
- def imm_bytes(imm, num_bytes)
- bytes = []
- bits = imm
- num_bytes.times do
- bytes << (bits & 0xff)
- bits >>= 8
- end
- if bits != 0
- raise ArgumentError, "unexpected imm with #{num_bytes} bytes: #{imm}"
- end
- bytes
- end
-
- def imm8?(imm)
- (-0x80..0x7f).include?(imm)
- end
-
- def imm64?(imm)
- (-0x8000_0000_0000_0000..0x7fff_ffff_ffff_ffff).include?(imm) # TODO: consider uimm
- end
-
- def r32?(reg)
- reg.start_with?('e')
- end
-
- def r64?(reg)
- reg.start_with?('r')
- end
-
- def link_labels
- @bytes.each_with_index do |byte, index|
- if byte.is_a?(Label)
- src_index = index + 1 # offset 1 byte for rel8 itself
- dst_index = @labels.fetch(byte)
- rel8 = dst_index - src_index
- raise "unexpected offset: #{rel8}" unless imm8?(rel8)
- @bytes[index] = rel8
- end
- end
- end
- end
-end
generated by cgit v1.2.3 (git 2.25.1) at 2025-06-20 11:59:45 +0000