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Save PC and SP on entry exit

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This commit is contained in:
Takashi Kokubun 2023-02-08 10:24:13 -08:00
parent 6be4e065eb
commit 2cd6406d67
4 changed files with 16 additions and 10 deletions
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15
lib/ruby_vm/mjit/exit_compiler.rb
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@ -8,11 +8,12 @@ module RubyVM::MJIT
# Used for invalidating a block on entry.
# @param pc [Integer]
# @param asm [RubyVM::MJIT::Assembler]
def compile_entry_exit(pc, asm, cause:)
def compile_entry_exit(pc, ctx, asm, cause:)
# Increment per-insn exit counter
incr_insn_exit(pc, asm)
# TODO: Saving pc and sp may be needed later
# Fix pc/sp offsets for the interpreter
save_pc_and_sp(pc, ctx, asm, reset_sp_offset: false)
# Restore callee-saved registers
asm.comment("#{cause}: entry exit")
@ -45,7 +46,7 @@ module RubyVM::MJIT
incr_insn_exit(jit.pc, asm)
# Fix pc/sp offsets for the interpreter
save_pc_and_sp(jit, ctx.dup, asm) # dup to avoid sp_offset update
save_pc_and_sp(jit.pc, ctx.dup, asm) # dup to avoid sp_offset update
# Restore callee-saved registers
asm.comment("exit to interpreter on #{pc_to_insn(jit.pc).name}")
@ -93,17 +94,19 @@ module RubyVM::MJIT
# @param jit [RubyVM::MJIT::JITState]
# @param ctx [RubyVM::MJIT::Context]
# @param asm [RubyVM::MJIT::Assembler]
def save_pc_and_sp(jit, ctx, asm)
def save_pc_and_sp(pc, ctx, asm, reset_sp_offset: true)
# Update pc (TODO: manage PC offset?)
asm.comment("save PC#{' and SP' if ctx.sp_offset != 0} to CFP")
asm.mov(:rax, jit.pc) # rax = jit.pc
asm.mov(:rax, pc) # rax = jit.pc
asm.mov([CFP, C.rb_control_frame_t.offsetof(:pc)], :rax) # cfp->pc = rax
# Update sp
if ctx.sp_offset != 0
asm.add(SP, C.VALUE.size * ctx.sp_offset) # sp += stack_size
asm.mov([CFP, C.rb_control_frame_t.offsetof(:sp)], SP) # cfp->sp = sp
ctx.sp_offset = 0
if reset_sp_offset
ctx.sp_offset = 0
end
end
end