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path: root/tool/ruby_vm/views/_mjit_compile_insn.erb
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% # -*- mode:c; style:ruby; coding: utf-8; indent-tabs-mode: nil -*-
% # Copyright (c) 2018 Takashi Kokubun.  All rights reserved.
% #
% # This file is a part of  the programming language Ruby.  Permission is hereby
% # granted, to either  redistribute and/or modify this file,  provided that the
% # conditions mentioned  in the  file COPYING  are met.   Consult the  file for
% # details.
    fprintf(f, "{\n");
    {
% # compiler: Prepare operands which may be used by `insn.call_attribute`
% insn.opes.each_with_index do |ope, i|
        MAYBE_UNUSED(<%= ope.fetch(:decl) %>) = (<%= ope.fetch(:type) %>)operands[<%= i %>];
% end
%
% # JIT: Declare stack_size to be used in some macro of _mjit_compile_insn_body.erb
        if (status->local_stack_p) {
            fprintf(f, "    MAYBE_UNUSED(unsigned int) stack_size = %u;\n", b->stack_size);
        }
%
% # JIT: Declare variables for operands, popped values and return values
% insn.declarations.each do |decl|
        fprintf(f, "    <%= decl %>;\n");
% end

% # JIT: Set const expressions for `RubyVM::OperandsUnifications` insn
% insn.preamble.each do |amble|
        fprintf(f, "<%= amble.expr %>\n");
% end
%
% # JIT: Initialize operands
% insn.opes.each_with_index do |ope, i|
        fprintf(f, "    <%= ope.fetch(:name) %> = (<%= ope.fetch(:type) %>)0x%"PRIxVALUE";", operands[<%= i %>]);
%   case ope.fetch(:type)
%   when 'ID'
        comment_id(f, (ID)operands[<%= i %>]);
%   when 'CALL_INFO'
        comment_id(f, ((CALL_INFO)operands[<%= i %>])->mid);
%   when 'VALUE'
        if (SYMBOL_P((VALUE)operands[<%= i %>])) comment_id(f, SYM2ID((VALUE)operands[<%= i %>]));
%   end
        fprintf(f, "\n");
% end
%
% # JIT: Initialize popped values
% insn.pops.reverse_each.with_index.reverse_each do |pop, i|
        fprintf(f, "    <%= pop.fetch(:name) %> = stack[%d];\n", b->stack_size - <%= i + 1 %>);
% end
%
% # JIT: move sp and pc if necessary
<%= render 'mjit_compile_pc_and_sp', locals: { insn: insn } -%>
%
% # JIT: Print insn body in insns.def
<%= render 'mjit_compile_insn_body', locals: { insn: insn } -%>
%
% # JIT: Set return values
% insn.rets.reverse_each.with_index do |ret, i|
%   # TOPN(n) = ...
        fprintf(f, "    stack[%d] = <%= ret.fetch(:name) %>;\n", b->stack_size + (int)<%= insn.call_attribute('sp_inc') %> - <%= i + 1 %>);
% end
%
% # JIT: We should evaluate ISeq modified for TracePoint if it's enabled. Note: This is slow.
% unless insn.always_leaf?
        fprintf(f, "    if (UNLIKELY(ruby_vm_event_enabled_flags & ISEQ_TRACE_EVENTS)) {\n");
        fprintf(f, "        reg_cfp->sp = (VALUE *)reg_cfp->bp + %d;\n", b->stack_size + (int)<%= insn.call_attribute('sp_inc') %> + 1);
        if (!body->catch_except_p) {
            fprintf(f, "        reg_cfp->pc = original_body_iseq + %d;\n", next_pos);
        }
        fprintf(f, "        goto cancel;\n");
        fprintf(f, "    }\n");
% end
%
% # compiler: Move JIT compiler's internal stack pointer
        b->stack_size += <%= insn.call_attribute('sp_inc') %>;
    }
    fprintf(f, "}\n");
%
% # compiler: If insn has conditional JUMP, the branch which is not targeted by JUMP should be compiled too.
% if insn.expr.expr =~ /if\s+\([^{}]+\)\s+\{[^{}]+JUMP\([^)]+\);[^{}]+\}/
    compile_insns(f, body, b->stack_size, pos + insn_len(insn), status);
% 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.expr =~ /\sTHROW_EXCEPTION\([^)]+\);/ || insn.expr.expr =~ /\sRESTORE_REGS\(\);/
    b->finish_p = TRUE;
% end