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zend_jit_ir.c
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/*
* +----------------------------------------------------------------------+
* | Zend JIT |
* +----------------------------------------------------------------------+
* | Copyright (c) The PHP Group |
* +----------------------------------------------------------------------+
* | This source file is subject to version 3.01 of the PHP license, |
* | that is bundled with this package in the file LICENSE, and is |
* | available through the world-wide-web at the following url: |
* | https://www.php.net/license/3_01.txt |
* | If you did not receive a copy of the PHP license and are unable to |
* | obtain it through the world-wide-web, please send a note to |
* | license@php.net so we can mail you a copy immediately. |
* +----------------------------------------------------------------------+
* | Authors: Dmitry Stogov <dmitry@php.net> |
* +----------------------------------------------------------------------+
*/
#include "jit/ir/ir.h"
#include "jit/ir/ir_builder.h"
#if defined(IR_TARGET_X86)
# define IR_REG_SP 4 /* IR_REG_RSP */
# define IR_REG_FP 5 /* IR_REG_RBP */
# define ZREG_FP 6 /* IR_REG_RSI */
# define ZREG_IP 7 /* IR_REG_RDI */
# define ZREG_FIRST_FPR 8
# define IR_REGSET_PRESERVED ((1<<3) | (1<<5) | (1<<6) | (1<<7)) /* all preserved registers */
#elif defined(IR_TARGET_X64)
# define IR_REG_SP 4 /* IR_REG_RSP */
# define IR_REG_FP 5 /* IR_REG_RBP */
# define ZREG_FP 14 /* IR_REG_R14 */
# define ZREG_IP 15 /* IR_REG_R15 */
# define ZREG_FIRST_FPR 16
# if defined(_WIN64)
# define IR_REGSET_PRESERVED ((1<<3) | (1<<5) | (1<<6) | (1<<7) | (1<<12) | (1<<13) | (1<<14) | (1<<15))
/*
# define IR_REGSET_PRESERVED ((1<<3) | (1<<5) | (1<<6) | (1<<7) | (1<<12) | (1<<13) | (1<<14) | (1<<15) | \
(1<<(16+6)) | (1<<(16+7)) | (1<<(16+8)) | (1<<(16+9)) | (1<<(16+10)) | \
(1<<(16+11)) | (1<<(16+12)) | (1<<(16+13)) | (1<<(16+14)) | (1<<(16+15)))
*/
# define IR_SHADOW_ARGS 32
# else
# define IR_REGSET_PRESERVED ((1<<3) | (1<<5) | (1<<12) | (1<<13) | (1<<14) | (1<<15)) /* all preserved registers */
# endif
#elif defined(IR_TARGET_AARCH64)
# define IR_REG_SP 31 /* IR_REG_RSP */
# define IR_REG_FP 29 /* IR_REG_X29 */
# define ZREG_FP 27 /* IR_REG_X27 */
# define ZREG_IP 28 /* IR_REG_X28 */
# define ZREG_FIRST_FPR 32
# define IR_REGSET_PRESERVED ((1<<19) | (1<<20) | (1<<21) | (1<<22) | (1<<23) | \
(1<<24) | (1<<25) | (1<<26) | (1<<27) | (1<<28)) /* all preserved registers */
#else
# error "Unknown IR target"
#endif
#define ZREG_RX ZREG_IP
#define OPTIMIZE_FOR_SIZE 0
/* IR builder defines */
#undef _ir_CTX
#define _ir_CTX (&jit->ctx)
#undef ir_CONST_ADDR
#define ir_CONST_ADDR(_addr) jit_CONST_ADDR(jit, (uintptr_t)(_addr))
#define ir_CONST_FUNC(_addr) jit_CONST_FUNC(jit, (uintptr_t)(_addr), 0)
#define ir_CONST_FC_FUNC(_addr) jit_CONST_FUNC(jit, (uintptr_t)(_addr), IR_FASTCALL_FUNC)
#define ir_CAST_FC_FUNC(_addr) ir_fold2(_ir_CTX, IR_OPT(IR_PROTO, IR_ADDR), (_addr), \
ir_proto_0(_ir_CTX, IR_FASTCALL_FUNC, IR_I32))
#define ir_CONST_FUNC_PROTO(_addr, _proto) \
jit_CONST_FUNC_PROTO(jit, (uintptr_t)(_addr), (_proto))
#undef ir_ADD_OFFSET
#define ir_ADD_OFFSET(_addr, _offset) \
jit_ADD_OFFSET(jit, _addr, _offset)
#ifdef ZEND_ENABLE_ZVAL_LONG64
# define IR_LONG IR_I64
# define ir_CONST_LONG ir_CONST_I64
# define ir_UNARY_OP_L ir_UNARY_OP_I64
# define ir_BINARY_OP_L ir_BINARY_OP_I64
# define ir_ADD_L ir_ADD_I64
# define ir_SUB_L ir_SUB_I64
# define ir_MUL_L ir_MUL_I64
# define ir_DIV_L ir_DIV_I64
# define ir_MOD_L ir_MOD_I64
# define ir_NEG_L ir_NEG_I64
# define ir_ABS_L ir_ABS_I64
# define ir_SEXT_L ir_SEXT_I64
# define ir_ZEXT_L ir_ZEXT_I64
# define ir_TRUNC_L ir_TRUNC_I64
# define ir_BITCAST_L ir_BITCAST_I64
# define ir_FP2L ir_FP2I64
# define ir_ADD_OV_L ir_ADD_OV_I64
# define ir_SUB_OV_L ir_SUB_OV_I64
# define ir_MUL_OV_L ir_MUL_OV_I64
# define ir_NOT_L ir_NOT_I64
# define ir_OR_L ir_OR_I64
# define ir_AND_L ir_AND_I64
# define ir_XOR_L ir_XOR_I64
# define ir_SHL_L ir_SHL_I64
# define ir_SHR_L ir_SHR_I64
# define ir_SAR_L ir_SAR_I64
# define ir_ROL_L ir_ROL_I64
# define ir_ROR_L ir_ROR_I64
# define ir_MIN_L ir_MIN_I64
# define ir_MAX_L ir_MAX_I64
# define ir_LOAD_L ir_LOAD_I64
#else
# define IR_LONG IR_I32
# define ir_CONST_LONG ir_CONST_I32
# define ir_UNARY_OP_L ir_UNARY_OP_I32
# define ir_BINARY_OP_L ir_BINARY_OP_I32
# define ir_ADD_L ir_ADD_I32
# define ir_SUB_L ir_SUB_I32
# define ir_MUL_L ir_MUL_I32
# define ir_DIV_L ir_DIV_I32
# define ir_MOD_L ir_MOD_I32
# define ir_NEG_L ir_NEG_I32
# define ir_ABS_L ir_ABS_I32
# define ir_SEXT_L ir_SEXT_I32
# define ir_ZEXT_L ir_ZEXT_I32
# define ir_TRUNC_L ir_TRUNC_I32
# define ir_BITCAST_L ir_BITCAST_I32
# define ir_FP2L ir_FP2I32
# define ir_ADD_OV_L ir_ADD_OV_I32
# define ir_SUB_OV_L ir_SUB_OV_I32
# define ir_MUL_OV_L ir_MUL_OV_I32
# define ir_NOT_L ir_NOT_I32
# define ir_OR_L ir_OR_I32
# define ir_AND_L ir_AND_I32
# define ir_XOR_L ir_XOR_I32
# define ir_SHL_L ir_SHL_I32
# define ir_SHR_L ir_SHR_I32
# define ir_SAR_L ir_SAR_I32
# define ir_ROL_L ir_ROL_I32
# define ir_ROR_L ir_ROR_I32
# define ir_MIN_L ir_MIN_I32
# define ir_MAX_L ir_MAX_I32
# define ir_LOAD_L ir_LOAD_I32
#endif
/* A helper structure to collect IT rers for the following use in (MERGE/PHI)_N */
typedef struct _ir_refs {
uint32_t count;
uint32_t limit;
ir_ref refs[] ZEND_ELEMENT_COUNT(count);
} ir_refs;
#define ir_refs_size(_n) (offsetof(ir_refs, refs) + sizeof(ir_ref) * (_n))
#define ir_refs_init(_name, _n) _name = alloca(ir_refs_size(_n)); \
do {_name->count = 0; _name->limit = (_n);} while (0)
static void ir_refs_add(ir_refs *refs, ir_ref ref)
{
ir_ref *ptr;
ZEND_ASSERT(refs->count < refs->limit);
ptr = refs->refs;
ptr[refs->count++] = ref;
}
static size_t zend_jit_trace_prologue_size = (size_t)-1;
#if defined(IR_TARGET_X86) || defined(IR_TARGET_X64)
static uint32_t allowed_opt_flags = 0;
static uint32_t default_mflags = 0;
#endif
static bool delayed_call_chain = 0; // TODO: remove this var (use jit->delayed_call_level) ???
#ifdef ZTS
# ifdef _WIN32
extern uint32_t _tls_index;
extern char *_tls_start;
extern char *_tls_end;
# endif
static size_t tsrm_ls_cache_tcb_offset = 0;
static size_t tsrm_tls_index = 0;
static size_t tsrm_tls_offset = 0;
# define EG_TLS_OFFSET(field) \
(executor_globals_offset + offsetof(zend_executor_globals, field))
# define CG_TLS_OFFSET(field) \
(compiler_globals_offset + offsetof(zend_compiler_globals, field))
# define jit_EG(_field) \
ir_ADD_OFFSET(jit_TLS(jit), EG_TLS_OFFSET(_field))
# define jit_CG(_field) \
ir_ADD_OFFSET(jit_TLS(jit), CG_TLS_OFFSET(_field))
#else
# define jit_EG(_field) \
ir_CONST_ADDR(&EG(_field))
# define jit_CG(_field) \
ir_CONST_ADDR(&CG(_field))
#endif
#define jit_CALL(_call, _field) \
ir_ADD_OFFSET(_call, offsetof(zend_execute_data, _field))
#define jit_EX(_field) \
jit_CALL(jit_FP(jit), _field)
#define jit_RX(_field) \
jit_CALL(jit_IP(jit), _field)
#define JIT_STUBS(_) \
_(exception_handler, IR_SKIP_PROLOGUE) \
_(exception_handler_undef, IR_SKIP_PROLOGUE) \
_(exception_handler_free_op2, IR_SKIP_PROLOGUE) \
_(exception_handler_free_op1_op2, IR_SKIP_PROLOGUE) \
_(interrupt_handler, IR_SKIP_PROLOGUE) \
_(leave_function_handler, IR_SKIP_PROLOGUE) \
_(negative_shift, IR_SKIP_PROLOGUE) \
_(mod_by_zero, IR_SKIP_PROLOGUE) \
_(invalid_this, IR_SKIP_PROLOGUE) \
_(undefined_function, IR_SKIP_PROLOGUE) \
_(throw_cannot_pass_by_ref, IR_SKIP_PROLOGUE) \
_(icall_throw, IR_SKIP_PROLOGUE) \
_(leave_throw, IR_SKIP_PROLOGUE) \
_(hybrid_runtime_jit, IR_SKIP_PROLOGUE | IR_START_BR_TARGET) \
_(hybrid_profile_jit, IR_SKIP_PROLOGUE | IR_START_BR_TARGET) \
_(hybrid_func_hot_counter, IR_SKIP_PROLOGUE | IR_START_BR_TARGET) \
_(hybrid_loop_hot_counter, IR_SKIP_PROLOGUE | IR_START_BR_TARGET) \
_(hybrid_func_trace_counter, IR_SKIP_PROLOGUE | IR_START_BR_TARGET) \
_(hybrid_ret_trace_counter, IR_SKIP_PROLOGUE | IR_START_BR_TARGET) \
_(hybrid_loop_trace_counter, IR_SKIP_PROLOGUE | IR_START_BR_TARGET) \
_(trace_halt, IR_SKIP_PROLOGUE) \
_(trace_escape, IR_SKIP_PROLOGUE) \
_(trace_exit, IR_SKIP_PROLOGUE) \
_(undefined_offset, IR_FUNCTION | IR_FASTCALL_FUNC) \
_(undefined_key, IR_FUNCTION | IR_FASTCALL_FUNC) \
_(cannot_add_element, IR_FUNCTION | IR_FASTCALL_FUNC) \
_(assign_const, IR_FUNCTION | IR_FASTCALL_FUNC) \
_(assign_tmp, IR_FUNCTION | IR_FASTCALL_FUNC) \
_(assign_var, IR_FUNCTION | IR_FASTCALL_FUNC) \
_(assign_cv_noref, IR_FUNCTION | IR_FASTCALL_FUNC) \
_(assign_cv, IR_FUNCTION | IR_FASTCALL_FUNC) \
_(new_array, IR_FUNCTION | IR_FASTCALL_FUNC) \
#define JIT_STUB_ID(name, flags) \
jit_stub_ ## name,
#define JIT_STUB_FORWARD(name, flags) \
static int zend_jit_ ## name ## _stub(zend_jit_ctx *jit);
#define JIT_STUB(name, flags) \
{JIT_STUB_PREFIX #name, zend_jit_ ## name ## _stub, flags},
typedef enum _jit_stub_id {
JIT_STUBS(JIT_STUB_ID)
jit_last_stub
} jit_stub_id;
typedef struct _zend_jit_reg_var {
ir_ref ref;
uint32_t flags;
} zend_jit_reg_var;
typedef struct _zend_jit_ctx {
ir_ctx ctx;
const zend_op *last_valid_opline;
bool use_last_valid_opline;
bool track_last_valid_opline;
bool reuse_ip;
uint32_t delayed_call_level;
int b; /* current basic block number or -1 */
#ifdef ZTS
ir_ref tls;
#endif
ir_ref fp;
ir_ref trace_loop_ref;
ir_ref return_inputs;
const zend_op_array *op_array;
const zend_op_array *current_op_array;
zend_ssa *ssa;
zend_string *name;
ir_ref *bb_start_ref; /* PHP BB -> IR ref mapping */
ir_ref *bb_predecessors; /* PHP BB -> index in bb_edges -> IR refs of predessors */
ir_ref *bb_edges;
zend_jit_trace_info *trace;
zend_jit_reg_var *ra;
int delay_var;
ir_refs *delay_refs;
ir_ref eg_exception_addr;
HashTable addr_hash;
ir_ref stub_addr[jit_last_stub];
} zend_jit_ctx;
typedef int8_t zend_reg;
typedef struct _zend_jit_registers_buf {
#if defined(IR_TARGET_X64)
uint64_t gpr[16]; /* general purpose integer register */
double fpr[16]; /* floating point registers */
#elif defined(IR_TARGET_X86)
uint32_t gpr[8]; /* general purpose integer register */
double fpr[8]; /* floating point registers */
#elif defined (IR_TARGET_AARCH64)
uint64_t gpr[32]; /* general purpose integer register */
double fpr[32]; /* floating point registers */
#else
# error "Unknown IR target"
#endif
} zend_jit_registers_buf;
/* Keep 32 exit points in a single code block */
#define ZEND_JIT_EXIT_POINTS_SPACING 4 // push byte + short jmp = bytes
#define ZEND_JIT_EXIT_POINTS_PER_GROUP 32 // number of continuous exit points
static uint32_t zend_jit_exit_point_by_addr(const void *addr);
int ZEND_FASTCALL zend_jit_trace_exit(uint32_t exit_num, zend_jit_registers_buf *regs);
static int zend_jit_assign_to_variable(zend_jit_ctx *jit,
const zend_op *opline,
zend_jit_addr var_use_addr,
zend_jit_addr var_addr,
uint32_t var_info,
uint32_t var_def_info,
uint8_t val_type,
zend_jit_addr val_addr,
uint32_t val_info,
zend_jit_addr res_addr,
zend_jit_addr ref_addr,
bool check_exception);
typedef struct _zend_jit_stub {
const char *name;
int (*stub)(zend_jit_ctx *jit);
uint32_t flags;
} zend_jit_stub;
JIT_STUBS(JIT_STUB_FORWARD)
static const zend_jit_stub zend_jit_stubs[] = {
JIT_STUBS(JIT_STUB)
};
#if defined(_WIN32) || defined(IR_TARGET_AARCH64)
/* We keep addresses in SHM to share them between sepaeate processes (on Windows) or to support veneers (on AArch64) */
static void** zend_jit_stub_handlers = NULL;
#else
static void* zend_jit_stub_handlers[sizeof(zend_jit_stubs) / sizeof(zend_jit_stubs[0])];
#endif
#if defined(IR_TARGET_AARCH64)
# ifdef __FreeBSD__
/* https://github.com/freebsd/freebsd-src/blob/c52ca7dd09066648b1cc40f758289404d68ab886/libexec/rtld-elf/aarch64/reloc.c#L180-L184 */
typedef struct TLSDescriptor {
void* thunk;
int index;
size_t offset;
} TLSDescriptor;
# endif
#define IR_HAS_VENEERS (1U<<31) /* IR_RESERVED_FLAG_1 */
static const void *zend_jit_get_veneer(ir_ctx *ctx, const void *addr)
{
int i, count = sizeof(zend_jit_stubs) / sizeof(zend_jit_stubs[0]);
for (i = 0; i < count; i++) {
if (zend_jit_stub_handlers[i] == addr) {
return zend_jit_stub_handlers[count + i];
}
}
if (((zend_jit_ctx*)ctx)->trace
&& (void*)addr >= dasm_buf && (void*)addr < dasm_end) {
uint32_t exit_point = zend_jit_exit_point_by_addr(addr);
if (exit_point != (uint32_t)-1) {
zend_jit_trace_info *t = ((zend_jit_ctx*)ctx)->trace;
ZEND_ASSERT(exit_point < t->exit_count);
return (const void*)((char*)ctx->deoptimization_exits_base + (exit_point * 4));
}
}
return NULL;
}
static bool zend_jit_set_veneer(ir_ctx *ctx, const void *addr, const void *veneer)
{
int i, count = sizeof(zend_jit_stubs) / sizeof(zend_jit_stubs[0]);
uint32_t exit_point = zend_jit_exit_point_by_addr(addr);
if (exit_point != (uint32_t)-1) {
return 1;
}
for (i = 0; i < count; i++) {
if (zend_jit_stub_handlers[i] == addr) {
const void **ptr = (const void**)&zend_jit_stub_handlers[count + i];
*ptr = veneer;
ctx->flags2 |= IR_HAS_VENEERS;
#ifdef HAVE_CAPSTONE
int64_t offset;
if (JIT_G(debug) & ZEND_JIT_DEBUG_ASM) {
const char *name = ir_disasm_find_symbol((uint64_t)(uintptr_t)addr, &offset);
if (name && !offset) {
if (strstr(name, "@veneer") == NULL) {
char *new_name;
zend_spprintf(&new_name, 0, "%s@veneer", name);
ir_disasm_add_symbol(new_name, (uint64_t)(uintptr_t)veneer, 4);
efree(new_name);
} else {
ir_disasm_add_symbol(name, (uint64_t)(uintptr_t)veneer, 4);
}
}
}
#endif
return 1;
}
}
return 0;
}
static void zend_jit_commit_veneers(void)
{
int i, count = sizeof(zend_jit_stubs) / sizeof(zend_jit_stubs[0]);
for (i = 0; i < count; i++) {
if (zend_jit_stub_handlers[count + i]) {
zend_jit_stub_handlers[i] = zend_jit_stub_handlers[count + i];
zend_jit_stub_handlers[count + i] = NULL;
}
}
}
#endif
static bool zend_jit_prefer_const_addr_load(zend_jit_ctx *jit, uintptr_t addr)
{
#if defined(IR_TARGET_X86)
return 0; /* always use immediate value */
#elif defined(IR_TARGET_X64)
return addr > 0xffffffff; /* prefer loading long constant from memery */
#elif defined(IR_TARGET_AARCH64)
return addr > 0xffff;
#else
# error "Unknown IR target"
#endif
}
static const char* zend_reg_name(int8_t reg)
{
return ir_reg_name(reg, ir_reg_is_int(reg) ? IR_LONG : IR_DOUBLE);
}
/* IR helpers */
#ifdef ZTS
static ir_ref jit_TLS(zend_jit_ctx *jit)
{
ZEND_ASSERT(jit->ctx.control);
if (jit->tls) {
/* Emit "TLS" once for basic block */
ir_insn *insn;
ir_ref ref = jit->ctx.control;
while (1) {
if (ref == jit->tls) {
return jit->tls;
}
insn = &jit->ctx.ir_base[ref];
if (insn->op >= IR_START || insn->op == IR_CALL) {
break;
}
ref = insn->op1;
}
}
jit->tls = ir_TLS(
tsrm_ls_cache_tcb_offset ? tsrm_ls_cache_tcb_offset : tsrm_tls_index,
tsrm_ls_cache_tcb_offset ? IR_NULL : tsrm_tls_offset);
return jit->tls;
}
#endif
static ir_ref jit_CONST_ADDR(zend_jit_ctx *jit, uintptr_t addr)
{
ir_ref ref;
zval *zv;
if (addr == 0) {
return IR_NULL;
}
zv = zend_hash_index_lookup(&jit->addr_hash, addr);
if (Z_TYPE_P(zv) == IS_LONG) {
ref = Z_LVAL_P(zv);
ZEND_ASSERT(jit->ctx.ir_base[ref].opt == IR_OPT(IR_ADDR, IR_ADDR));
} else {
ref = ir_unique_const_addr(&jit->ctx, addr);
ZVAL_LONG(zv, ref);
}
return ref;
}
static ir_ref jit_CONST_FUNC_PROTO(zend_jit_ctx *jit, uintptr_t addr, ir_ref proto)
{
ir_ref ref;
ir_insn *insn;
zval *zv;
ZEND_ASSERT(addr != 0);
zv = zend_hash_index_lookup(&jit->addr_hash, addr);
if (Z_TYPE_P(zv) == IS_LONG) {
ref = Z_LVAL_P(zv);
ZEND_ASSERT(jit->ctx.ir_base[ref].opt == IR_OPT(IR_FUNC_ADDR, IR_ADDR) && jit->ctx.ir_base[ref].proto == proto);
} else {
ref = ir_unique_const_addr(&jit->ctx, addr);
insn = &jit->ctx.ir_base[ref];
insn->optx = IR_OPT(IR_FUNC_ADDR, IR_ADDR);
insn->proto = proto;
ZVAL_LONG(zv, ref);
}
return ref;
}
static ir_ref jit_CONST_FUNC(zend_jit_ctx *jit, uintptr_t addr, uint16_t flags)
{
#if defined(IR_TARGET_X86)
/* TODO: dummy prototype (only flags matter) ??? */
ir_ref proto = flags ? ir_proto_0(&jit->ctx, flags, IR_I32) : 0;
#else
ir_ref proto = 0;
#endif
return jit_CONST_FUNC_PROTO(jit, addr, proto);
}
static ir_ref jit_ADD_OFFSET(zend_jit_ctx *jit, ir_ref addr, uintptr_t offset)
{
if (offset) {
addr = ir_ADD_A(addr, ir_CONST_ADDR(offset));
}
return addr;
}
static ir_ref jit_EG_exception(zend_jit_ctx *jit)
{
#ifdef ZTS
return jit_EG(exception);
#else
ir_ref ref = jit->eg_exception_addr;
if (UNEXPECTED(!ref)) {
ref = ir_unique_const_addr(&jit->ctx, (uintptr_t)&EG(exception));
jit->eg_exception_addr = ref;
}
return ref;
#endif
}
static ir_ref jit_STUB_ADDR(zend_jit_ctx *jit, jit_stub_id id)
{
ir_ref ref = jit->stub_addr[id];
if (UNEXPECTED(!ref)) {
ref = ir_unique_const_addr(&jit->ctx, (uintptr_t)zend_jit_stub_handlers[id]);
jit->stub_addr[id] = ref;
}
return ref;
}
static ir_ref jit_STUB_FUNC_ADDR(zend_jit_ctx *jit, jit_stub_id id, uint16_t flags)
{
ir_ref ref = jit->stub_addr[id];
ir_insn *insn;
if (UNEXPECTED(!ref)) {
ref = ir_unique_const_addr(&jit->ctx, (uintptr_t)zend_jit_stub_handlers[id]);
insn = &jit->ctx.ir_base[ref];
insn->optx = IR_OPT(IR_FUNC_ADDR, IR_ADDR);
#if defined(IR_TARGET_X86)
/* TODO: dummy prototype (only flags matter) ??? */
insn->proto = flags ? ir_proto_0(&jit->ctx, flags, IR_I32) : 0;
#else
insn->proto = 0;
#endif
jit->stub_addr[id] = ref;
}
return ref;
}
static void jit_SNAPSHOT(zend_jit_ctx *jit, ir_ref addr)
{
if (JIT_G(trigger) == ZEND_JIT_ON_HOT_TRACE && JIT_G(current_frame)) {
const void *ptr = (const void*)jit->ctx.ir_base[addr].val.addr;
const zend_op_array *op_array = &JIT_G(current_frame)->func->op_array;
uint32_t stack_size = op_array->last_var + op_array->T;
if (ptr == zend_jit_stub_handlers[jit_stub_exception_handler]
|| ptr == zend_jit_stub_handlers[jit_stub_exception_handler_undef]
|| ptr == zend_jit_stub_handlers[jit_stub_exception_handler_free_op1_op2]
|| ptr == zend_jit_stub_handlers[jit_stub_exception_handler_free_op2]
|| ptr == zend_jit_stub_handlers[jit_stub_interrupt_handler]
|| ptr == zend_jit_stub_handlers[jit_stub_leave_function_handler]
|| ptr == zend_jit_stub_handlers[jit_stub_negative_shift]
|| ptr == zend_jit_stub_handlers[jit_stub_mod_by_zero]
|| ptr == zend_jit_stub_handlers[jit_stub_invalid_this]
|| ptr == zend_jit_stub_handlers[jit_stub_undefined_function]
|| ptr == zend_jit_stub_handlers[jit_stub_throw_cannot_pass_by_ref]
|| ptr == zend_jit_stub_handlers[jit_stub_icall_throw]
|| ptr == zend_jit_stub_handlers[jit_stub_leave_throw]
|| ptr == zend_jit_stub_handlers[jit_stub_trace_halt]
|| ptr == zend_jit_stub_handlers[jit_stub_trace_escape]) {
/* This is a GUARD that trigger exit through a stub code (without deoptimization) */
return;
}
/* Check if we need snapshot entries for polymorphic method call */
zend_jit_trace_info *t = jit->trace;
uint32_t exit_point = 0, n = 0;
if (addr < 0) {
if (t->exit_count > 0
&& jit->ctx.ir_base[addr].val.u64 == (uintptr_t)zend_jit_trace_get_exit_addr(t->exit_count - 1)) {
exit_point = t->exit_count - 1;
if (t->exit_info[exit_point].flags & ZEND_JIT_EXIT_METHOD_CALL) {
n = 2;
}
}
}
if (stack_size || n) {
zend_jit_trace_stack *stack = JIT_G(current_frame)->stack;
uint32_t snapshot_size, i;
snapshot_size = stack_size;
while (snapshot_size > 0) {
ir_ref ref = STACK_REF(stack, snapshot_size - 1);
if (!ref || ref == IR_NULL || (STACK_FLAGS(stack, snapshot_size - 1) & (/*ZREG_LOAD|*/ZREG_STORE))) {
snapshot_size--;
} else {
break;
}
}
if (snapshot_size || n) {
ir_ref snapshot;
snapshot = ir_SNAPSHOT(snapshot_size + n);
for (i = 0; i < snapshot_size; i++) {
ir_ref ref = STACK_REF(stack, i);
if (!ref || ref == IR_NULL || (STACK_FLAGS(stack, i) & (/*ZREG_LOAD|*/ZREG_STORE))) {
ref = IR_UNUSED;
}
ir_SNAPSHOT_SET_OP(snapshot, i + 1, ref);
}
if (n) {
ir_SNAPSHOT_SET_OP(snapshot, snapshot_size + 1, t->exit_info[exit_point].poly_func_ref);
ir_SNAPSHOT_SET_OP(snapshot, snapshot_size + 2, t->exit_info[exit_point].poly_this_ref);
}
}
}
}
}
static int32_t _add_trace_const(zend_jit_trace_info *t, int64_t val)
{
int32_t i;
for (i = 0; i < t->consts_count; i++) {
if (t->constants[i].i == val) {
return i;
}
}
ZEND_ASSERT(i < 0x7fffffff);
t->consts_count = i + 1;
t->constants = erealloc(t->constants, (i + 1) * sizeof(zend_jit_exit_const));
t->constants[i].i = val;
return i;
}
uint32_t zend_jit_duplicate_exit_point(ir_ctx *ctx, zend_jit_trace_info *t, uint32_t exit_point, ir_ref snapshot_ref)
{
uint32_t stack_size, stack_offset;
uint32_t new_exit_point = t->exit_count;
if (new_exit_point >= ZEND_JIT_TRACE_MAX_EXITS) {
ctx->status = -ZEND_JIT_TRACE_STOP_TOO_MANY_EXITS;
return exit_point;
}
t->exit_count++;
memcpy(&t->exit_info[new_exit_point], &t->exit_info[exit_point], sizeof(zend_jit_trace_exit_info));
stack_size = t->exit_info[new_exit_point].stack_size;
if (stack_size != 0) {
stack_offset = t->stack_map_size;
t->stack_map_size += stack_size;
// TODO: reduce number of reallocations ???
t->stack_map = erealloc(t->stack_map, t->stack_map_size * sizeof(zend_jit_trace_stack));
memcpy(t->stack_map + stack_offset, t->stack_map + t->exit_info[new_exit_point].stack_offset, stack_size * sizeof(zend_jit_trace_stack));
t->exit_info[new_exit_point].stack_offset = stack_offset;
}
t->exit_info[new_exit_point].flags &= ~ZEND_JIT_EXIT_FIXED;
return new_exit_point;
}
void *zend_jit_snapshot_handler(ir_ctx *ctx, ir_ref snapshot_ref, ir_insn *snapshot, void *addr)
{
zend_jit_trace_info *t = ((zend_jit_ctx*)ctx)->trace;
uint32_t exit_point, exit_flags;
ir_ref n = snapshot->inputs_count;
ir_ref i;
exit_point = zend_jit_exit_point_by_addr(addr);
ZEND_ASSERT(exit_point < t->exit_count);
exit_flags = t->exit_info[exit_point].flags;
if (exit_flags & ZEND_JIT_EXIT_METHOD_CALL) {
int8_t *reg_ops = ctx->regs[snapshot_ref];
ZEND_ASSERT(reg_ops[n - 1] != -1 && reg_ops[n] != -1);
if ((exit_flags & ZEND_JIT_EXIT_FIXED)
&& (t->exit_info[exit_point].poly_func_reg != reg_ops[n - 1]
|| t->exit_info[exit_point].poly_this_reg != reg_ops[n])) {
exit_point = zend_jit_duplicate_exit_point(ctx, t, exit_point, snapshot_ref);
addr = (void*)zend_jit_trace_get_exit_addr(exit_point);
exit_flags &= ~ZEND_JIT_EXIT_FIXED;
}
t->exit_info[exit_point].poly_func_reg = reg_ops[n - 1];
t->exit_info[exit_point].poly_this_reg = reg_ops[n];
n -= 2;
}
for (i = 2; i <= n; i++) {
ir_ref ref = ir_insn_op(snapshot, i);
if (ref) {
int8_t *reg_ops = ctx->regs[snapshot_ref];
int8_t reg = reg_ops[i];
ir_ref var = i - 2;
ZEND_ASSERT(var < t->exit_info[exit_point].stack_size);
if (t->stack_map[t->exit_info[exit_point].stack_offset + var].flags == ZREG_ZVAL_COPY) {
ZEND_ASSERT(reg != ZREG_NONE);
if ((exit_flags & ZEND_JIT_EXIT_FIXED)
&& t->stack_map[t->exit_info[exit_point].stack_offset + var].reg != IR_REG_NUM(reg)) {
exit_point = zend_jit_duplicate_exit_point(ctx, t, exit_point, snapshot_ref);
addr = (void*)zend_jit_trace_get_exit_addr(exit_point);
exit_flags &= ~ZEND_JIT_EXIT_FIXED;
}
t->stack_map[t->exit_info[exit_point].stack_offset + var].reg = IR_REG_NUM(reg);
} else if (t->stack_map[t->exit_info[exit_point].stack_offset + var].flags != ZREG_CONST) {
ZEND_ASSERT(t->stack_map[t->exit_info[exit_point].stack_offset + var].type == IS_LONG ||
t->stack_map[t->exit_info[exit_point].stack_offset + var].type == IS_DOUBLE);
if (ref > 0) {
if (reg != ZREG_NONE) {
if (reg & IR_REG_SPILL_LOAD) {
ZEND_ASSERT(!(reg & IR_REG_SPILL_SPECIAL));
/* spill slot on a CPU stack */
if ((exit_flags & ZEND_JIT_EXIT_FIXED)
&& (t->stack_map[t->exit_info[exit_point].stack_offset + var].ref != ref
|| t->stack_map[t->exit_info[exit_point].stack_offset + var].reg != ZREG_NONE
|| !(t->stack_map[t->exit_info[exit_point].stack_offset + var].flags & ZREG_SPILL_SLOT))) {
exit_point = zend_jit_duplicate_exit_point(ctx, t, exit_point, snapshot_ref);
addr = (void*)zend_jit_trace_get_exit_addr(exit_point);
exit_flags &= ~ZEND_JIT_EXIT_FIXED;
}
t->stack_map[t->exit_info[exit_point].stack_offset + var].ref = ref;
t->stack_map[t->exit_info[exit_point].stack_offset + var].reg = ZREG_NONE;
t->stack_map[t->exit_info[exit_point].stack_offset + var].flags |= ZREG_SPILL_SLOT;
} else if (reg & IR_REG_SPILL_SPECIAL) {
/* spill slot on a VM stack */
if ((exit_flags & ZEND_JIT_EXIT_FIXED)
&& (t->stack_map[t->exit_info[exit_point].stack_offset + var].reg != ZREG_NONE
|| t->stack_map[t->exit_info[exit_point].stack_offset + var].flags != ZREG_TYPE_ONLY)) {
exit_point = zend_jit_duplicate_exit_point(ctx, t, exit_point, snapshot_ref);
addr = (void*)zend_jit_trace_get_exit_addr(exit_point);
exit_flags &= ~ZEND_JIT_EXIT_FIXED;
}
t->stack_map[t->exit_info[exit_point].stack_offset + var].reg = ZREG_NONE;
t->stack_map[t->exit_info[exit_point].stack_offset + var].flags = ZREG_TYPE_ONLY;
} else {
if ((exit_flags & ZEND_JIT_EXIT_FIXED)
&& t->stack_map[t->exit_info[exit_point].stack_offset + var].reg != IR_REG_NUM(reg)) {
exit_point = zend_jit_duplicate_exit_point(ctx, t, exit_point, snapshot_ref);
addr = (void*)zend_jit_trace_get_exit_addr(exit_point);
exit_flags &= ~ZEND_JIT_EXIT_FIXED;
}
t->stack_map[t->exit_info[exit_point].stack_offset + var].reg = IR_REG_NUM(reg);
}
} else {
if ((exit_flags & ZEND_JIT_EXIT_FIXED)
&& (t->stack_map[t->exit_info[exit_point].stack_offset + var].reg != ZREG_NONE
|| t->stack_map[t->exit_info[exit_point].stack_offset + var].flags != ZREG_TYPE_ONLY)) {
exit_point = zend_jit_duplicate_exit_point(ctx, t, exit_point, snapshot_ref);
addr = (void*)zend_jit_trace_get_exit_addr(exit_point);
exit_flags &= ~ZEND_JIT_EXIT_FIXED;
}
t->stack_map[t->exit_info[exit_point].stack_offset + var].flags = ZREG_TYPE_ONLY;
}
} else if (!(exit_flags & ZEND_JIT_EXIT_FIXED)) {
int32_t idx = _add_trace_const(t, ctx->ir_base[ref].val.i64);
t->stack_map[t->exit_info[exit_point].stack_offset + var].flags = ZREG_CONST;
t->stack_map[t->exit_info[exit_point].stack_offset + var].ref = idx;
}
}
}
}
t->exit_info[exit_point].flags |= ZEND_JIT_EXIT_FIXED;
return addr;
}
static void jit_SIDE_EXIT(zend_jit_ctx *jit, ir_ref addr)
{
jit_SNAPSHOT(jit, addr);
ir_IJMP(addr);
}
/* PHP JIT helpers */
static ir_ref jit_EMALLOC(zend_jit_ctx *jit, size_t size, const zend_op_array *op_array, const zend_op *opline)
{
#if ZEND_DEBUG
return ir_CALL_5(IR_ADDR, ir_CONST_FC_FUNC(_emalloc),
ir_CONST_ADDR(size),
op_array->filename ? ir_CONST_ADDR(op_array->filename->val) : IR_NULL,
ir_CONST_U32(opline ? opline->lineno : 0),
IR_NULL,
ir_CONST_U32(0));
#elif defined(HAVE_BUILTIN_CONSTANT_P)
if (size > 24 && size <= 32) {
return ir_CALL(IR_ADDR, ir_CONST_FC_FUNC(_emalloc_32));
} else {
return ir_CALL_1(IR_ADDR, ir_CONST_FC_FUNC(_emalloc), ir_CONST_ADDR(size));
}
#else
return ir_CALL_1(IR_ADDR, ir_CONST_FC_FUNC(_emalloc), ir_CONST_ADDR(size));
#endif
}
static ir_ref jit_EFREE(zend_jit_ctx *jit, ir_ref ptr, size_t size, const zend_op_array *op_array, const zend_op *opline)
{
#if ZEND_DEBUG
return ir_CALL_5(IR_ADDR, ir_CONST_FC_FUNC(_efree),
ptr,
op_array && op_array->filename ? ir_CONST_ADDR(op_array->filename->val) : IR_NULL,
ir_CONST_U32(opline ? opline->lineno : 0),
IR_NULL,
ir_CONST_U32(0));
#elif defined(HAVE_BUILTIN_CONSTANT_P)
if (size > 24 && size <= 32) {
return ir_CALL_1(IR_ADDR, ir_CONST_FC_FUNC(_efree_32), ptr);
} else {
return ir_CALL_1(IR_ADDR, ir_CONST_FC_FUNC(_efree), ptr);
}
#else
return ir_CALL_1(IR_ADDR, ir_CONST_FC_FUNC(_efree), ptr);
#endif
}
static ir_ref jit_FP(zend_jit_ctx *jit)
{
ZEND_ASSERT(jit->ctx.control);
if (jit->fp == IR_UNUSED) {
/* Emit "RLOAD FP" once for basic block */
jit->fp = ir_RLOAD_A(ZREG_FP);
} else {
ir_insn *insn;
ir_ref ref = jit->ctx.control;
while (1) {
if (ref == jit->fp) {
break;
}
insn = &jit->ctx.ir_base[ref];
if (insn->op >= IR_START || insn->op == IR_CALL) {
jit->fp = ir_RLOAD_A(ZREG_FP);
break;
}
ref = insn->op1;
}
}
return jit->fp;
}
static void jit_STORE_FP(zend_jit_ctx *jit, ir_ref ref)
{
ir_RSTORE(ZREG_FP, ref);
jit->fp = IR_UNUSED;
}
static ir_ref jit_IP(zend_jit_ctx *jit)
{
return ir_RLOAD_A(ZREG_IP);
}
static void jit_STORE_IP(zend_jit_ctx *jit, ir_ref ref)
{
ir_RSTORE(ZREG_IP, ref);
}
static ir_ref jit_IP32(zend_jit_ctx *jit)
{
return ir_RLOAD_U32(ZREG_IP);
}
static void jit_LOAD_IP(zend_jit_ctx *jit, ir_ref ref)
{
if (GCC_GLOBAL_REGS) {
jit_STORE_IP(jit, ref);
} else {
ir_STORE(jit_EX(opline), ref);
}
}
static void jit_LOAD_IP_ADDR(zend_jit_ctx *jit, const zend_op *target)
{
jit_LOAD_IP(jit, ir_CONST_ADDR(target));
}
static void zend_jit_track_last_valid_opline(zend_jit_ctx *jit)
{
jit->use_last_valid_opline = 0;
jit->track_last_valid_opline = 1;
}
static void zend_jit_use_last_valid_opline(zend_jit_ctx *jit)
{
if (jit->track_last_valid_opline) {
jit->use_last_valid_opline = 1;
jit->track_last_valid_opline = 0;
}
}
static bool zend_jit_trace_uses_initial_ip(zend_jit_ctx *jit)
{
return jit->use_last_valid_opline;
}
static void zend_jit_set_last_valid_opline(zend_jit_ctx *jit, const zend_op *opline)
{
if (!jit->reuse_ip) {
jit->track_last_valid_opline = 1;
jit->last_valid_opline = opline;
}
}
static void zend_jit_reset_last_valid_opline(zend_jit_ctx *jit)
{
jit->track_last_valid_opline = 0;
jit->last_valid_opline = NULL;
}
static void zend_jit_start_reuse_ip(zend_jit_ctx *jit)
{
zend_jit_reset_last_valid_opline(jit);
jit->reuse_ip = 1;
}
static int zend_jit_reuse_ip(zend_jit_ctx *jit)
{
if (!jit->reuse_ip) {
zend_jit_start_reuse_ip(jit);
// RX = EX(call);
jit_STORE_IP(jit, ir_LOAD_A(jit_EX(call)));
}
return 1;
}
static void zend_jit_stop_reuse_ip(zend_jit_ctx *jit)
{
jit->reuse_ip = 0;
}
static int zend_jit_save_call_chain(zend_jit_ctx *jit, uint32_t call_level)
{
ir_ref rx, call;
if (call_level == 1) {
// JIT: call = NULL;
call = IR_NULL;
} else {
// JIT: call = EX(call);
call = ir_LOAD_A(jit_EX(call));
}
rx = jit_IP(jit);
// JIT: call->prev_execute_data = call;
ir_STORE(jit_CALL(rx, prev_execute_data), call);
// JIT: EX(call) = call;
ir_STORE(jit_EX(call), rx);