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Define constants for magic registers

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This commit is contained in:
Takashi Kokubun 2022-12-23 16:23:21 -08:00
parent 783f730773
commit 5db2ef5e14
2 changed files with 16 additions and 11 deletions
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17
lib/ruby_vm/mjit/compiler.rb
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@ -13,6 +13,11 @@ module RubyVM::MJIT
Qnil = Fiddle::Qnil
Qundef = Fiddle::Qundef
# Fixed registers
EC = :rdi # TODO: change this
CFP = :rsi # TODO: change this
SP = :rbx
class Compiler
attr_accessor :write_pos
@ -65,10 +70,10 @@ module RubyVM::MJIT
# @param asm [RubyVM::MJIT::X86Assembler]
def compile_prologue(asm)
# Save callee-saved registers used by JITed code
asm.push(:rbx)
asm.push(SP)
# Load sp to a register
asm.mov(:rbx, [:rsi, C.rb_control_frame_t.offsetof(:sp)]) # rbx = cfp->sp
asm.mov(SP, [CFP, C.rb_control_frame_t.offsetof(:sp)]) # rbx = cfp->sp
end
# @param asm [RubyVM::MJIT::X86Assembler]
@ -103,16 +108,16 @@ module RubyVM::MJIT
def compile_exit(ctx, asm, exit_pc)
# update pc
asm.mov(:rax, exit_pc) # rax = exit_pc
asm.mov([:rsi, C.rb_control_frame_t.offsetof(:pc)], :rax) # cfp->pc = rax
asm.mov([CFP, C.rb_control_frame_t.offsetof(:pc)], :rax) # cfp->pc = rax
# update sp
if ctx.stack_size > 0
asm.add(:rbx, C.VALUE.size * ctx.stack_size) # rbx += stack_size
asm.mov([:rsi, C.rb_control_frame_t.offsetof(:sp)], :rbx) # cfp->sp = rbx
asm.add(SP, C.VALUE.size * ctx.stack_size) # rbx += stack_size
asm.mov([CFP, C.rb_control_frame_t.offsetof(:sp)], SP) # cfp->sp = rbx
end
# Restore callee-saved registers
asm.pop(:rbx)
asm.pop(SP)
asm.mov(:rax, Qundef)
asm.ret