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0244f91e89
Now this one is actually not in use because we override entire leave definition for JIT.
498 lines
21 KiB
C
498 lines
21 KiB
C
/**********************************************************************
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mjit_compile.c - MRI method JIT compiler
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Copyright (C) 2017 Takashi Kokubun <takashikkbn@gmail.com>.
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**********************************************************************/
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// NOTE: All functions in this file are executed on MJIT worker. So don't
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// call Ruby methods (C functions that may call rb_funcall) or trigger
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// GC (using ZALLOC, xmalloc, xfree, etc.) in this file.
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#include "ruby/3/config.h"
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#if USE_MJIT
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#include "internal.h"
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#include "internal/compile.h"
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#include "internal/hash.h"
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#include "internal/variable.h"
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#include "mjit.h"
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#include "vm_core.h"
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#include "vm_callinfo.h"
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#include "vm_exec.h"
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#include "vm_insnhelper.h"
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#include "builtin.h"
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#include "insns.inc"
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#include "insns_info.inc"
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// Macros to check if a position is already compiled using compile_status.stack_size_for_pos
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#define NOT_COMPILED_STACK_SIZE -1
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#define ALREADY_COMPILED_P(status, pos) (status->stack_size_for_pos[pos] != NOT_COMPILED_STACK_SIZE)
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// For propagating information needed for lazily pushing a frame.
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struct inlined_call_context {
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int orig_argc; // ci->orig_argc
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VALUE me; // vm_cc_cme(cc)
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int param_size; // def_iseq_ptr(vm_cc_cme(cc)->def)->body->param.size
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int local_size; // def_iseq_ptr(vm_cc_cme(cc)->def)->body->local_table_size
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};
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// Storage to keep compiler's status. This should have information
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// which is global during one `mjit_compile` call. Ones conditional
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// in each branch should be stored in `compile_branch`.
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struct compile_status {
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bool success; // has true if compilation has had no issue
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int *stack_size_for_pos; // stack_size_for_pos[pos] has stack size for the position (otherwise -1)
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// If true, JIT-ed code will use local variables to store pushed values instead of
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// using VM's stack and moving stack pointer.
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bool local_stack_p;
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// Safely-accessible ivar cache entries copied from main thread.
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union iseq_inline_storage_entry *is_entries;
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// Index of call cache entries captured to compiled_iseq to be marked on GC
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int cc_entries_index;
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// A pointer to root (i.e. not inlined) iseq being compiled.
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const struct rb_iseq_constant_body *compiled_iseq;
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int compiled_id; // Just a copy of compiled_iseq->jit_unit->id
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// Mutated optimization levels
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struct rb_mjit_compile_info *compile_info;
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// If `inlined_iseqs[pos]` is not NULL, `mjit_compile_body` tries to inline ISeq there.
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const struct rb_iseq_constant_body **inlined_iseqs;
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struct inlined_call_context inline_context;
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};
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// Storage to keep data which is consistent in each conditional branch.
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// This is created and used for one `compile_insns` call and its values
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// should be copied for extra `compile_insns` call.
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struct compile_branch {
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unsigned int stack_size; // this simulates sp (stack pointer) of YARV
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bool finish_p; // if true, compilation in this branch should stop and let another branch to be compiled
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};
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struct case_dispatch_var {
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FILE *f;
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unsigned int base_pos;
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VALUE last_value;
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};
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static size_t
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call_data_index(CALL_DATA cd, const struct rb_iseq_constant_body *body)
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{
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return cd - body->call_data;
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}
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const struct rb_callcache ** mjit_iseq_cc_entries(const struct rb_iseq_constant_body *const body);
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// Using this function to refer to cc_entries allocated by `mjit_capture_cc_entries`
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// instead of storing cc_entries in status directly so that we always refer to a new address
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// returned by `realloc` inside it.
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static const struct rb_callcache **
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captured_cc_entries(const struct compile_status *status)
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{
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VM_ASSERT(status->cc_entries_index != -1);
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return mjit_iseq_cc_entries(status->compiled_iseq) + status->cc_entries_index;
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}
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// Returns true if call cache is still not obsoleted and vm_cc_cme(cc)->def->type is available.
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static bool
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has_valid_method_type(CALL_CACHE cc)
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{
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return vm_cc_cme(cc) != NULL;
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}
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// Returns true if iseq can use fastpath for setup, otherwise NULL. This becomes true in the same condition
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// as CC_SET_FASTPATH (in vm_callee_setup_arg) is called from vm_call_iseq_setup.
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static bool
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fastpath_applied_iseq_p(const CALL_INFO ci, const CALL_CACHE cc, const rb_iseq_t *iseq)
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{
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extern bool rb_simple_iseq_p(const rb_iseq_t *iseq);
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return iseq != NULL
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&& !(vm_ci_flag(ci) & VM_CALL_KW_SPLAT) && rb_simple_iseq_p(iseq) // Top of vm_callee_setup_arg. In this case, opt_pc is 0.
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&& vm_ci_argc(ci) == (unsigned int)iseq->body->param.lead_num // exclude argument_arity_error (assumption: `calling->argc == ci->orig_argc` in send insns)
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&& vm_call_iseq_optimizable_p(ci, cc); // CC_SET_FASTPATH condition
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}
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static int
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compile_case_dispatch_each(VALUE key, VALUE value, VALUE arg)
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{
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struct case_dispatch_var *var = (struct case_dispatch_var *)arg;
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unsigned int offset;
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if (var->last_value != value) {
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offset = FIX2INT(value);
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var->last_value = value;
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fprintf(var->f, " case %d:\n", offset);
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fprintf(var->f, " goto label_%d;\n", var->base_pos + offset);
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fprintf(var->f, " break;\n");
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}
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return ST_CONTINUE;
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}
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// Calling rb_id2str in MJIT worker causes random SEGV. So this is disabled by default.
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static void
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comment_id(FILE *f, ID id)
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{
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#ifdef MJIT_COMMENT_ID
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VALUE name = rb_id2str(id);
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const char *p, *e;
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char c, prev = '\0';
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if (!name) return;
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p = RSTRING_PTR(name);
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e = RSTRING_END(name);
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fputs("/* :\"", f);
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for (; p < e; ++p) {
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switch (c = *p) {
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case '*': case '/': if (prev != (c ^ ('/' ^ '*'))) break;
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case '\\': case '"': fputc('\\', f);
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}
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fputc(c, f);
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prev = c;
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}
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fputs("\" */", f);
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#endif
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}
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static void compile_insns(FILE *f, const struct rb_iseq_constant_body *body, unsigned int stack_size,
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unsigned int pos, struct compile_status *status);
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// Main function of JIT compilation, vm_exec_core counterpart for JIT. Compile one insn to `f`, may modify
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// b->stack_size and return next position.
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//
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// When you add a new instruction to insns.def, it would be nice to have JIT compilation support here but
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// it's optional. This JIT compiler just ignores ISeq which includes unknown instruction, and ISeq which
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// does not have it can be compiled as usual.
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static unsigned int
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compile_insn(FILE *f, const struct rb_iseq_constant_body *body, const int insn, const VALUE *operands,
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const unsigned int pos, struct compile_status *status, struct compile_branch *b)
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{
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unsigned int next_pos = pos + insn_len(insn);
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/*****************/
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#include "mjit_compile.inc"
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/*****************/
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// If next_pos is already compiled and this branch is not finished yet,
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// next instruction won't be compiled in C code next and will need `goto`.
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if (!b->finish_p && next_pos < body->iseq_size && ALREADY_COMPILED_P(status, next_pos)) {
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fprintf(f, "goto label_%d;\n", next_pos);
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// Verify stack size assumption is the same among multiple branches
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if ((unsigned int)status->stack_size_for_pos[next_pos] != b->stack_size) {
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if (mjit_opts.warnings || mjit_opts.verbose)
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fprintf(stderr, "MJIT warning: JIT stack assumption is not the same between branches (%d != %u)\n",
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status->stack_size_for_pos[next_pos], b->stack_size);
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status->success = false;
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}
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}
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return next_pos;
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}
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// Compile one conditional branch. If it has branchXXX insn, this should be
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// called multiple times for each branch.
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static void
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compile_insns(FILE *f, const struct rb_iseq_constant_body *body, unsigned int stack_size,
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unsigned int pos, struct compile_status *status)
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{
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int insn;
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struct compile_branch branch;
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branch.stack_size = stack_size;
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branch.finish_p = false;
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while (pos < body->iseq_size && !ALREADY_COMPILED_P(status, pos) && !branch.finish_p) {
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#if OPT_DIRECT_THREADED_CODE || OPT_CALL_THREADED_CODE
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insn = rb_vm_insn_addr2insn((void *)body->iseq_encoded[pos]);
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#else
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insn = (int)body->iseq_encoded[pos];
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#endif
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status->stack_size_for_pos[pos] = (int)branch.stack_size;
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fprintf(f, "\nlabel_%d: /* %s */\n", pos, insn_name(insn));
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pos = compile_insn(f, body, insn, body->iseq_encoded + (pos+1), pos, status, &branch);
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if (status->success && branch.stack_size > body->stack_max) {
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if (mjit_opts.warnings || mjit_opts.verbose)
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fprintf(stderr, "MJIT warning: JIT stack size (%d) exceeded its max size (%d)\n", branch.stack_size, body->stack_max);
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status->success = false;
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}
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if (!status->success)
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break;
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}
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}
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// Print the block to cancel inlined method call. It's supporting only `opt_send_without_block` for now.
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static void
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compile_inlined_cancel_handler(FILE *f, const struct rb_iseq_constant_body *body, struct inlined_call_context *inline_context)
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{
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fprintf(f, "\ncancel:\n");
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fprintf(f, " RB_DEBUG_COUNTER_INC(mjit_cancel);\n");
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fprintf(f, " rb_mjit_iseq_compile_info(original_iseq->body)->disable_inlining = true;\n");
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fprintf(f, " rb_mjit_recompile_iseq(original_iseq);\n");
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// Swap pc/sp set on cancel with original pc/sp.
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fprintf(f, " const VALUE *current_pc = reg_cfp->pc;\n");
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fprintf(f, " VALUE *current_sp = reg_cfp->sp;\n");
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fprintf(f, " reg_cfp->pc = orig_pc;\n");
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fprintf(f, " reg_cfp->sp = orig_sp;\n\n");
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// Lazily push the current call frame.
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fprintf(f, " struct rb_calling_info calling;\n");
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fprintf(f, " calling.block_handler = VM_BLOCK_HANDLER_NONE;\n"); // assumes `opt_send_without_block`
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fprintf(f, " calling.argc = %d;\n", inline_context->orig_argc);
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fprintf(f, " calling.recv = reg_cfp->self;\n");
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fprintf(f, " reg_cfp->self = orig_self;\n");
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fprintf(f, " vm_call_iseq_setup_normal(ec, reg_cfp, &calling, (const rb_callable_method_entry_t *)0x%"PRIxVALUE", 0, %d, %d);\n\n",
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inline_context->me, inline_context->param_size, inline_context->local_size); // fastpath_applied_iseq_p checks rb_simple_iseq_p, which ensures has_opt == FALSE
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// Start usual cancel from here.
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fprintf(f, " reg_cfp = ec->cfp;\n"); // work on the new frame
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fprintf(f, " reg_cfp->pc = current_pc;\n");
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fprintf(f, " reg_cfp->sp = current_sp;\n");
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for (unsigned int i = 0; i < body->stack_max; i++) { // should be always `status->local_stack_p`
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fprintf(f, " *(vm_base_ptr(reg_cfp) + %d) = stack[%d];\n", i, i);
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}
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// We're not just returning Qundef here so that caller's normal cancel handler can
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// push back `stack` to `cfp->sp`.
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fprintf(f, " return vm_exec(ec, FALSE);\n");
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}
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// Print the block to cancel JIT execution.
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static void
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compile_cancel_handler(FILE *f, const struct rb_iseq_constant_body *body, struct compile_status *status)
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{
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if (status->inlined_iseqs == NULL) { // the current ISeq is being inlined
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compile_inlined_cancel_handler(f, body, &status->inline_context);
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return;
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}
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fprintf(f, "\nsend_cancel:\n");
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fprintf(f, " RB_DEBUG_COUNTER_INC(mjit_cancel_send_inline);\n");
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fprintf(f, " rb_mjit_iseq_compile_info(original_iseq->body)->disable_send_cache = true;\n");
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fprintf(f, " rb_mjit_recompile_iseq(original_iseq);\n");
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fprintf(f, " goto cancel;\n");
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fprintf(f, "\nivar_cancel:\n");
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fprintf(f, " RB_DEBUG_COUNTER_INC(mjit_cancel_ivar_inline);\n");
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fprintf(f, " rb_mjit_iseq_compile_info(original_iseq->body)->disable_ivar_cache = true;\n");
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fprintf(f, " rb_mjit_recompile_iseq(original_iseq);\n");
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fprintf(f, " goto cancel;\n");
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fprintf(f, "\nexivar_cancel:\n");
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fprintf(f, " RB_DEBUG_COUNTER_INC(mjit_cancel_exivar_inline);\n");
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fprintf(f, " rb_mjit_iseq_compile_info(original_iseq->body)->disable_exivar_cache = true;\n");
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fprintf(f, " rb_mjit_recompile_iseq(original_iseq);\n");
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fprintf(f, " goto cancel;\n");
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fprintf(f, "\ncancel:\n");
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fprintf(f, " RB_DEBUG_COUNTER_INC(mjit_cancel);\n");
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if (status->local_stack_p) {
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for (unsigned int i = 0; i < body->stack_max; i++) {
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fprintf(f, " *(vm_base_ptr(reg_cfp) + %d) = stack[%d];\n", i, i);
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}
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}
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fprintf(f, " return Qundef;\n");
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}
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extern int
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mjit_capture_cc_entries(const struct rb_iseq_constant_body *compiled_iseq, const struct rb_iseq_constant_body *captured_iseq);
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extern bool mjit_copy_cache_from_main_thread(const rb_iseq_t *iseq,
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union iseq_inline_storage_entry *is_entries);
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static bool
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mjit_compile_body(FILE *f, const rb_iseq_t *iseq, struct compile_status *status)
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{
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const struct rb_iseq_constant_body *body = iseq->body;
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status->success = true;
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status->local_stack_p = !body->catch_except_p;
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if (status->local_stack_p) {
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fprintf(f, " VALUE stack[%d];\n", body->stack_max);
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}
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else {
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fprintf(f, " VALUE *stack = reg_cfp->sp;\n");
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}
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if (status->inlined_iseqs != NULL) // i.e. compile root
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fprintf(f, " static const rb_iseq_t *original_iseq = (const rb_iseq_t *)0x%"PRIxVALUE";\n", (VALUE)iseq);
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fprintf(f, " static const VALUE *const original_body_iseq = (VALUE *)0x%"PRIxVALUE";\n",
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(VALUE)body->iseq_encoded);
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// Simulate `opt_pc` in setup_parameters_complex. Other PCs which may be passed by catch tables
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// are not considered since vm_exec doesn't call mjit_exec for catch tables.
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if (body->param.flags.has_opt) {
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int i;
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fprintf(f, "\n");
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fprintf(f, " switch (reg_cfp->pc - reg_cfp->iseq->body->iseq_encoded) {\n");
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for (i = 0; i <= body->param.opt_num; i++) {
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VALUE pc_offset = body->param.opt_table[i];
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fprintf(f, " case %"PRIdVALUE":\n", pc_offset);
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fprintf(f, " goto label_%"PRIdVALUE";\n", pc_offset);
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}
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fprintf(f, " }\n");
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}
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compile_insns(f, body, 0, 0, status);
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compile_cancel_handler(f, body, status);
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return status->success;
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}
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// Return true if the ISeq can be inlined without pushing a new control frame.
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static bool
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inlinable_iseq_p(const struct rb_iseq_constant_body *body)
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{
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// 1) If catch_except_p, caller frame should be preserved when callee catches an exception.
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// Then we need to wrap `vm_exec()` but then we can't inline the call inside it.
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//
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// 2) If `body->catch_except_p` is false and `handles_sp?` of an insn is false,
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// sp is not moved as we assume `status->local_stack_p = !body->catch_except_p`.
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//
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// 3) If `body->catch_except_p` is false and `always_leaf?` of an insn is true,
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// pc is not moved.
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if (body->catch_except_p)
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return false;
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unsigned int pos = 0;
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while (pos < body->iseq_size) {
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#if OPT_DIRECT_THREADED_CODE || OPT_CALL_THREADED_CODE
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int insn = rb_vm_insn_addr2insn((void *)body->iseq_encoded[pos]);
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#else
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int insn = (int)body->iseq_encoded[pos];
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#endif
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// All insns in the ISeq except `leave` (to be overridden in the inlined code)
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// should meet following strong assumptions:
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// * Do not require `cfp->sp` motion
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// * Do not move `cfp->pc`
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// * Do not read any `cfp->pc`
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if (insn != BIN(leave) && insn_may_depend_on_sp_or_pc(insn, body->iseq_encoded + (pos + 1)))
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return false;
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// At this moment, `cfp->ep` in an inlined method is not working.
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switch (insn) {
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case BIN(getlocal):
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case BIN(getlocal_WC_0):
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case BIN(getlocal_WC_1):
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case BIN(setlocal):
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case BIN(setlocal_WC_0):
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case BIN(setlocal_WC_1):
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case BIN(getblockparam):
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case BIN(getblockparamproxy):
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case BIN(setblockparam):
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return false;
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}
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pos += insn_len(insn);
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}
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return true;
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}
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// This needs to be macro instead of a function because it's using `alloca`.
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#define INIT_COMPILE_STATUS(status, body, compile_root_p) do { \
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status = (struct compile_status){ \
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.stack_size_for_pos = (int *)alloca(sizeof(int) * body->iseq_size), \
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.inlined_iseqs = compile_root_p ? \
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alloca(sizeof(const struct rb_iseq_constant_body *) * body->iseq_size) : NULL, \
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.is_entries = (body->is_size > 0) ? \
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alloca(sizeof(union iseq_inline_storage_entry) * body->is_size) : NULL, \
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.cc_entries_index = (body->ci_size > 0) ? \
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mjit_capture_cc_entries(status.compiled_iseq, body) : -1, \
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.compiled_id = status.compiled_id, \
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.compiled_iseq = status.compiled_iseq, \
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.compile_info = compile_root_p ? \
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rb_mjit_iseq_compile_info(body) : alloca(sizeof(struct rb_mjit_compile_info)) \
|
|
}; \
|
|
memset(status.stack_size_for_pos, NOT_COMPILED_STACK_SIZE, sizeof(int) * body->iseq_size); \
|
|
if (compile_root_p) \
|
|
memset((void *)status.inlined_iseqs, 0, sizeof(const struct rb_iseq_constant_body *) * body->iseq_size); \
|
|
else \
|
|
memset(status.compile_info, 0, sizeof(struct rb_mjit_compile_info)); \
|
|
} while (0)
|
|
|
|
// Compile inlinable ISeqs to C code in `f`. It returns true if it succeeds to compile them.
|
|
static bool
|
|
precompile_inlinable_iseqs(FILE *f, const rb_iseq_t *iseq, struct compile_status *status)
|
|
{
|
|
const struct rb_iseq_constant_body *body = iseq->body;
|
|
unsigned int pos = 0;
|
|
while (pos < body->iseq_size) {
|
|
#if OPT_DIRECT_THREADED_CODE || OPT_CALL_THREADED_CODE
|
|
int insn = rb_vm_insn_addr2insn((void *)body->iseq_encoded[pos]);
|
|
#else
|
|
int insn = (int)body->iseq_encoded[pos];
|
|
#endif
|
|
if (insn == BIN(opt_send_without_block)) { // `compile_inlined_cancel_handler` supports only `opt_send_without_block`
|
|
CALL_DATA cd = (CALL_DATA)body->iseq_encoded[pos + 1];
|
|
const struct rb_callinfo *ci = cd->ci;
|
|
const struct rb_callcache *cc = captured_cc_entries(status)[call_data_index(cd, body)]; // use copy to avoid race condition
|
|
|
|
const rb_iseq_t *child_iseq;
|
|
if (has_valid_method_type(cc) &&
|
|
!(vm_ci_flag(ci) & VM_CALL_TAILCALL) && // inlining only non-tailcall path
|
|
vm_cc_cme(cc)->def->type == VM_METHOD_TYPE_ISEQ &&
|
|
fastpath_applied_iseq_p(ci, cc, child_iseq = def_iseq_ptr(vm_cc_cme(cc)->def)) &&
|
|
// CC_SET_FASTPATH in vm_callee_setup_arg
|
|
inlinable_iseq_p(child_iseq->body)) {
|
|
status->inlined_iseqs[pos] = child_iseq->body;
|
|
|
|
if (mjit_opts.verbose >= 1) // print beforehand because ISeq may be GCed during copy job.
|
|
fprintf(stderr, "JIT inline: %s@%s:%d => %s@%s:%d\n",
|
|
RSTRING_PTR(iseq->body->location.label),
|
|
RSTRING_PTR(rb_iseq_path(iseq)), FIX2INT(iseq->body->location.first_lineno),
|
|
RSTRING_PTR(child_iseq->body->location.label),
|
|
RSTRING_PTR(rb_iseq_path(child_iseq)), FIX2INT(child_iseq->body->location.first_lineno));
|
|
|
|
struct compile_status child_status = { .compiled_iseq = status->compiled_iseq, .compiled_id = status->compiled_id };
|
|
INIT_COMPILE_STATUS(child_status, child_iseq->body, false);
|
|
child_status.inline_context = (struct inlined_call_context){
|
|
.orig_argc = vm_ci_argc(ci),
|
|
.me = (VALUE)vm_cc_cme(cc),
|
|
.param_size = child_iseq->body->param.size,
|
|
.local_size = child_iseq->body->local_table_size
|
|
};
|
|
if ((child_iseq->body->ci_size > 0 && child_status.cc_entries_index == -1)
|
|
|| (child_status.is_entries != NULL && !mjit_copy_cache_from_main_thread(child_iseq, child_status.is_entries))) {
|
|
return false;
|
|
}
|
|
|
|
fprintf(f, "ALWAYS_INLINE(static VALUE _mjit%d_inlined_%d(rb_execution_context_t *ec, rb_control_frame_t *reg_cfp, const VALUE orig_self, const rb_iseq_t *original_iseq));\n", status->compiled_id, pos);
|
|
fprintf(f, "static inline VALUE\n_mjit%d_inlined_%d(rb_execution_context_t *ec, rb_control_frame_t *reg_cfp, const VALUE orig_self, const rb_iseq_t *original_iseq)\n{\n", status->compiled_id, pos);
|
|
fprintf(f, " const VALUE *orig_pc = reg_cfp->pc;\n");
|
|
fprintf(f, " VALUE *orig_sp = reg_cfp->sp;\n");
|
|
bool success = mjit_compile_body(f, child_iseq, &child_status);
|
|
fprintf(f, "\n} /* end of _mjit%d_inlined_%d */\n\n", status->compiled_id, pos);
|
|
|
|
if (!success)
|
|
return false;
|
|
}
|
|
}
|
|
pos += insn_len(insn);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
// Compile ISeq to C code in `f`. It returns true if it succeeds to compile.
|
|
bool
|
|
mjit_compile(FILE *f, const rb_iseq_t *iseq, const char *funcname, int id)
|
|
{
|
|
struct compile_status status = { .compiled_iseq = iseq->body, .compiled_id = id };
|
|
INIT_COMPILE_STATUS(status, iseq->body, true);
|
|
if ((iseq->body->ci_size > 0 && status.cc_entries_index == -1)
|
|
|| (status.is_entries != NULL && !mjit_copy_cache_from_main_thread(iseq, status.is_entries))) {
|
|
return false;
|
|
}
|
|
|
|
if (!status.compile_info->disable_send_cache && !status.compile_info->disable_inlining) {
|
|
if (!precompile_inlinable_iseqs(f, iseq, &status))
|
|
return false;
|
|
}
|
|
|
|
#ifdef _WIN32
|
|
fprintf(f, "__declspec(dllexport)\n");
|
|
#endif
|
|
fprintf(f, "VALUE\n%s(rb_execution_context_t *ec, rb_control_frame_t *reg_cfp)\n{\n", funcname);
|
|
bool success = mjit_compile_body(f, iseq, &status);
|
|
fprintf(f, "\n} // end of %s\n", funcname);
|
|
return success;
|
|
}
|
|
|
|
#endif // USE_MJIT
|