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104 lines
4.3 KiB
104 lines
4.3 KiB
/******************************************************************************
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* Copyright (C) 2015 Dibyendu Majumdar
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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******************************************************************************/
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#include <ravi_gccjit.h>
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void ravi_emit_RETURN(ravi_function_def_t *def, int A, int B, int pc) {
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// Here is what OP_RETURN looks like. We only compile steps
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// marked with //*. This is because the rest is only relevant in the
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// interpreter
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// case OP_RETURN: {
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// int b = GETARG_B(i);
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//* if (cl->p->sizep > 0) luaF_close(L, base);
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//* b = luaD_poscall(L, ra, (b != 0 ? b - 1 : L->top - ra));
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// if (!(ci->callstatus & CIST_REENTRY)) /* 'ci' still the called one */
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// return; /* external invocation: return */
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// else { /* invocation via reentry: continue execution */
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// ci = L->ci;
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// if (b) L->top = ci->top;
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// goto newframe; /* restart luaV_execute over new Lua function */
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// }
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// }
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// As Lua inserts redundant OP_RETURN instructions it is
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// possible that this is one of them. If this is the case then the
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// current block may already be terminated - so we have to insert
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// a new block
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if (def->current_block_terminated) {
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gcc_jit_block *block = gcc_jit_function_new_block(
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def->jit_function, unique_name(def, "OP_RETURN", pc));
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ravi_set_current_block(def, block);
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}
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// Load pointer to base
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ravi_emit_load_base(def);
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// Get pointer to register A
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gcc_jit_lvalue *ra_ptr = ravi_emit_get_register(def, A);
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// if (cl->p->sizep > 0) luaF_close(L, base);
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// Get pointer to Proto->sizep
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gcc_jit_lvalue *psize = ravi_emit_get_Proto_sizep(def);
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// Test if psize > 0
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gcc_jit_rvalue *psize_gt_0 = ravi_emit_comparison(
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def, GCC_JIT_COMPARISON_GT, gcc_jit_lvalue_as_rvalue(psize),
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gcc_jit_context_new_rvalue_from_int(def->function_context,
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def->ravi->types->C_intT, 0));
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gcc_jit_block *then_block = gcc_jit_function_new_block(
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def->jit_function, unique_name(def, "OP_RETURN_if_sizep_gt_0", pc));
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gcc_jit_block *else_block = gcc_jit_function_new_block(
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def->jit_function, unique_name(def, "OP_RETURN_else_sizep_gt_0", pc));
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ravi_emit_conditional_branch(def, psize_gt_0, then_block, else_block);
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ravi_set_current_block(def, then_block);
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gcc_jit_block_add_eval(def->current_block, NULL,
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ravi_function_call2_rvalue(
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def, def->ravi->types->luaF_closeT,
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gcc_jit_param_as_rvalue(def->L), def->base_ref));
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// gcc_jit_lvalue_as_rvalue(def->base)));
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ravi_emit_branch(def, else_block);
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ravi_set_current_block(def, else_block);
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gcc_jit_rvalue *nresults = NULL;
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if (B != 0)
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nresults = ravi_int_constant(def, B - 1);
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else
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nresults = ravi_emit_num_stack_elements(
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def, gcc_jit_lvalue_get_address(ra_ptr, NULL));
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//* b = luaD_poscall(L, ci, ra, (b != 0 ? b - 1 : L->top - ra));
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gcc_jit_rvalue *b = ravi_function_call4_rvalue(
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def, def->ravi->types->luaD_poscallT, gcc_jit_param_as_rvalue(def->L),
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gcc_jit_lvalue_as_rvalue(def->ci_val),
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gcc_jit_lvalue_get_address(ra_ptr, NULL), nresults);
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gcc_jit_block_end_with_return(def->current_block, NULL, b);
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def->current_block_terminated = true;
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}
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