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ir/ir_check.c
Dmitry Stogov 169033c291 RETURN may be followed by ENTRY
2023-01-23 16:04:11 +03:00

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/*
* IR - Lightweight JIT Compilation Framework
* (IR verification)
* Copyright (C) 2022 Zend by Perforce.
* Authors: Dmitry Stogov <dmitry@php.net>
*/
#include "ir.h"
#include "ir_private.h"
void ir_consistency_check(void)
{
IR_ASSERT(IR_UNUSED == 0);
IR_ASSERT(IR_NOP == 0);
IR_ASSERT((int)IR_BOOL == (int)IR_C_BOOL);
IR_ASSERT((int)IR_U8 == (int)IR_C_U8);
IR_ASSERT((int)IR_U16 == (int)IR_C_U16);
IR_ASSERT((int)IR_U32 == (int)IR_C_U32);
IR_ASSERT((int)IR_U64 == (int)IR_C_U64);
IR_ASSERT((int)IR_ADDR == (int)IR_C_ADDR);
IR_ASSERT((int)IR_CHAR == (int)IR_C_CHAR);
IR_ASSERT((int)IR_I8 == (int)IR_C_I8);
IR_ASSERT((int)IR_I16 == (int)IR_C_I16);
IR_ASSERT((int)IR_I32 == (int)IR_C_I32);
IR_ASSERT((int)IR_I64 == (int)IR_C_I64);
IR_ASSERT((int)IR_DOUBLE == (int)IR_C_DOUBLE);
IR_ASSERT((int)IR_FLOAT == (int)IR_C_FLOAT);
IR_ASSERT((IR_EQ ^ 1) == IR_NE);
IR_ASSERT((IR_LT ^ 3) == IR_GT);
IR_ASSERT((IR_GT ^ 3) == IR_LT);
IR_ASSERT((IR_LE ^ 3) == IR_GE);
IR_ASSERT((IR_GE ^ 3) == IR_LE);
IR_ASSERT((IR_ULT ^ 3) == IR_UGT);
IR_ASSERT((IR_UGT ^ 3) == IR_ULT);
IR_ASSERT((IR_ULE ^ 3) == IR_UGE);
IR_ASSERT((IR_UGE ^ 3) == IR_ULE);
IR_ASSERT(IR_ADD + 1 == IR_SUB);
}
static bool ir_check_use_list(ir_ctx *ctx, ir_ref from, ir_ref to)
{
ir_ref n, j, *p;
ir_use_list *use_list = &ctx->use_lists[from];
n = use_list->count;
for (j = 0, p = &ctx->use_edges[use_list->refs]; j < n; j++, p++) {
if (*p == to) {
return 1;
}
}
return 0;
}
static bool ir_check_input_list(ir_ctx *ctx, ir_ref from, ir_ref to)
{
ir_insn *insn = &ctx->ir_base[to];
ir_ref n, j, *p;
n = ir_input_edges_count(ctx, insn);
for (j = 1, p = insn->ops + 1; j <= n; j++, p++) {
if (*p == from) {
return 1;
}
}
return 0;
}
bool ir_check(ir_ctx *ctx)
{
ir_ref i, j, n, *p, use;
ir_insn *insn, *use_insn;
uint32_t flags;
bool ok = 1;
for (i = IR_UNUSED + 1, insn = ctx->ir_base + i; i < ctx->insns_count;) {
flags = ir_op_flags[insn->op];
n = ir_input_edges_count(ctx, insn);
for (j = 1, p = insn->ops + 1; j <= n; j++, p++) {
use = *p;
if (use != IR_UNUSED) {
if (IR_IS_CONST_REF(use)) {
if (use >= ctx->consts_count) {
fprintf(stderr, "ir_base[%d].ops[%d] constant reference (%d) is out of range\n", i, j, use);
ok = 0;
}
} else {
if (use >= ctx->insns_count) {
fprintf(stderr, "ir_base[%d].ops[%d] insn reference (%d) is out of range\n", i, j, use);
ok = 0;
}
use_insn = &ctx->ir_base[use];
switch (IR_OPND_KIND(flags, j)) {
case IR_OPND_DATA:
if (use_insn->op == IR_VAR
|| !(ir_op_flags[use_insn->op] & IR_OP_FLAG_DATA)) {
if (!(ir_op_flags[use_insn->op] & IR_OP_FLAG_MEM)
|| use_insn->type == IR_VOID) {
fprintf(stderr, "ir_base[%d].ops[%d] reference (%d) must be DATA\n", i, j, use);
ok = 0;
}
}
if (use >= i
&& !(insn->op == IR_PHI && j > 1 && ctx->ir_base[insn->op1].op == IR_LOOP_BEGIN)) {
fprintf(stderr, "ir_base[%d].ops[%d] invalid forward reference (%d)\n", i, j, use);
ok = 0;
}
if (flags & IR_OP_FLAG_DATA) {
switch (insn->op) {
case IR_COND:
if (j == 1) {
break;
}
IR_FALLTHROUGH;
case IR_ADD:
case IR_SUB:
case IR_MUL:
case IR_DIV:
case IR_MOD:
case IR_NEG:
case IR_ABS:
case IR_ADD_OV:
case IR_SUB_OV:
case IR_MUL_OV:
case IR_NOT:
case IR_OR:
case IR_AND:
case IR_XOR:
case IR_SHL:
case IR_SHR:
case IR_SAR:
case IR_ROL:
case IR_ROR:
case IR_BSWAP:
case IR_MIN:
case IR_MAX:
case IR_PHI:
case IR_COPY:
case IR_PI:
if (insn->type != use_insn->type) {
if (j == 2
&& (insn->op == IR_SHL
|| insn->op == IR_SHR
|| insn->op == IR_SAR
|| insn->op == IR_ROL
|| insn->op == IR_ROR)
&& ir_type_size[use_insn->type] < ir_type_size[insn->type]) {
/* second argument of SHIFT may be incompatible with result */
break;
}
if (sizeof(void*) == 8) {
if (insn->type == IR_ADDR && use_insn->type == IR_U64) {
break;
}
} else {
if (insn->type == IR_ADDR && use_insn->type == IR_U32) {
break;
}
}
fprintf(stderr, "ir_base[%d].ops[%d] (%d) type is incompatible with result type (%d != %d)\n",
i, j, use, use_insn->type, insn->type);
ok = 0;
}
break;
}
}
break;
case IR_OPND_CONTROL:
if (flags & IR_OP_FLAG_BB_START) {
if (!(ir_op_flags[use_insn->op] & IR_OP_FLAG_BB_END)) {
fprintf(stderr, "ir_base[%d].ops[%d] reference (%d) must be BB_END\n", i, j, use);
ok = 0;
}
} else {
if (ir_op_flags[use_insn->op] & IR_OP_FLAG_BB_END) {
fprintf(stderr, "ir_base[%d].ops[%d] reference (%d) must not be BB_END\n", i, j, use);
ok = 0;
}
}
break;
case IR_OPND_CONTROL_DEP:
if (use >= i
&& !(insn->op == IR_LOOP_BEGIN)) {
fprintf(stderr, "ir_base[%d].ops[%d] invalid forward reference (%d)\n", i, j, use);
ok = 0;
} else if (insn->op == IR_PHI) {
ir_insn *merge_insn = &ctx->ir_base[insn->op1];
if (merge_insn->op != IR_MERGE && merge_insn->op != IR_LOOP_BEGIN) {
fprintf(stderr, "ir_base[%d].ops[%d] reference (%d) must be MERGE or LOOP_BEGIN\n", i, j, use);
ok = 0;
}
}
break;
case IR_OPND_CONTROL_REF:
if (!(ir_op_flags[use_insn->op] & IR_OP_FLAG_CONTROL)) {
fprintf(stderr, "ir_base[%d].ops[%d] reference (%d) must be CONTROL\n", i, j, use);
ok = 0;
}
break;
case IR_OPND_VAR:
if (ctx->ir_base[use].op != IR_VAR) {
fprintf(stderr, "ir_base[%d].ops[%d] reference (%d) must be VAR\n", i, j, use);
ok = 0;
}
if (use >= i) {
fprintf(stderr, "ir_base[%d].ops[%d] invalid forward reference (%d)\n", i, j, use);
ok = 0;
}
break;
default:
fprintf(stderr, "ir_base[%d].ops[%d] reference (%d) of unsupported kind\n", i, j, use);
ok = 0;
}
}
} else if ((insn->op == IR_RETURN || insn->op == IR_UNREACHABLE) && j == 2) {
/* pass (function returns void) */
} else if (insn->op == IR_BEGIN && j == 1) {
/* pass (start of unreachable basic block) */
// } else if (insn->op == IR_LOOP_BEGIN || insn->op == IR_MERGE) {
// /* TODO: something wrong ??? */
} else if (IR_OPND_KIND(flags, j) != IR_OPND_CONTROL_REF
&& (insn->op != IR_SNAPSHOT || j == 1)) {
fprintf(stderr, "ir_base[%d].ops[%d] missing reference (%d)\n", i, j, use);
ok = 0;
}
if (ctx->use_lists
&& use > 0
&& !ir_check_use_list(ctx, use, i)) {
fprintf(stderr, "ir_base[%d].ops[%d] is not in use list (%d)\n", i, j, use);
ok = 0;
}
}
if (ctx->use_lists) {
ir_use_list *use_list = &ctx->use_lists[i];
ir_ref count;
for (j = 0, p = &ctx->use_edges[use_list->refs]; j < use_list->count; j++, p++) {
use = *p;
if (!ir_check_input_list(ctx, i, use)) {
fprintf(stderr, "ir_base[%d] is in use list of ir_base[%d]\n", use, i);
ok = 0;
}
}
if ((flags & IR_OP_FLAG_CONTROL) && !(flags & IR_OP_FLAG_MEM)) {
switch (insn->op) {
case IR_SWITCH:
/* may have many successors */
if (use_list->count < 1) {
fprintf(stderr, "ir_base[%d].op (SWITCH) must have at least 1 succesor (%d)\n", i, use_list->count);
ok = 0;
}
break;
case IR_IF:
if (use_list->count != 2) {
fprintf(stderr, "ir_base[%d].op (IF) must have 2 succesors (%d)\n", i, use_list->count);
ok = 0;
}
break;
case IR_UNREACHABLE:
case IR_IJMP:
case IR_RETURN:
if (use_list->count == 1) {
/* UNREACHABLE, IJMP and RETURN may be used in MERGE with the following ENTRY */
break;
}
if (use_list->count != 0) {
fprintf(stderr, "ir_base[%d].op (%s) must not have successors (%d)\n",
i, ir_op_name[insn->op], use_list->count);
ok = 0;
}
break;
default:
/* skip data references */
count = use_list->count;
for (j = 0, p = &ctx->use_edges[use_list->refs]; j < use_list->count; j++, p++) {
use = *p;
if (!(ir_op_flags[ctx->ir_base[use].op] & IR_OP_FLAG_CONTROL)) {
count--;
}
}
if (count != 1) {
if (insn->op == IR_CALL && count == 2) {
/* result of CALL may be used as data in control instruction */
break;
}
fprintf(stderr, "ir_base[%d].op (%s) must have 1 succesor (%d)\n",
i, ir_op_name[insn->op], count);
ok = 0;
}
break;
}
}
}
n = 1 + (n >> 2); // support for multi-word instructions like MERGE and PHI
i += n;
insn += n;
}
IR_ASSERT(ok);
return ok;
}
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