341 lines
12 KiB
C++
341 lines
12 KiB
C++
/*
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Copyright (c) 2016 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Author: Leonardo de Moura
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*/
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#include "runtime/sstream.h"
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#include "util/fresh_name.h"
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#include "kernel/instantiate.h"
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#include "library/sorry.h"
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#include "library/constants.h"
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#include "library/trace.h"
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#include "library/annotation.h"
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#include "library/util.h"
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#include "library/replace_visitor.h"
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#include "library/vm/vm.h"
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#include "library/vm/optimize.h"
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#include "library/compiler/simp_inductive.h"
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#include "library/compiler/util.h"
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namespace lean {
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class emit_bytecode_fn {
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environment m_env;
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name_generator m_ngen;
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buffer<vm_instr> & m_code;
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void emit(vm_instr const & i) {
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m_code.push_back(i);
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}
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unsigned next_pc() const {
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return m_code.size();
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}
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expr mk_local(name const & n) {
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return ::lean::mk_local(n, mk_enf_neutral());
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}
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void compile_args(unsigned nargs, expr const * args, unsigned bpz, name_map<unsigned> const & m) {
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for (unsigned i = 0; i < nargs; i++, bpz++) {
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compile(args[i], bpz, m);
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}
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}
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void compile_rev_args(unsigned nargs, expr const * args, unsigned bpz, name_map<unsigned> const & m) {
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unsigned i = nargs;
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while (i > 0) {
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--i;
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compile(args[i], bpz, m);
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bpz++;
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}
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}
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void compile_global(vm_decl const & decl, unsigned nargs, expr const * args, unsigned bpz, name_map<unsigned> const & m) {
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compile_rev_args(nargs, args, bpz, m);
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if (decl.get_arity() <= nargs) {
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if (decl.is_builtin())
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emit(mk_invoke_builtin_instr(decl.get_idx()));
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else if (decl.is_cfun())
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emit(mk_invoke_cfun_instr(decl.get_idx()));
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else
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emit(mk_invoke_global_instr(decl.get_idx()));
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emit_apply_instr(nargs - decl.get_arity());
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} else {
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lean_assert(decl.get_arity() > nargs);
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emit(mk_closure_instr(decl.get_idx(), nargs));
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}
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}
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[[ noreturn ]] void throw_unknown_constant(name const & n) {
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throw exception(sstream() << "code generation failed, VM does not have code for '" << n << "'");
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}
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void emit_apply_instr(unsigned n) {
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for (unsigned i = 0; i < n; i++)
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emit(mk_apply_instr());
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}
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void compile_constant(expr const & e) {
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name const & n = const_name(e);
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if (is_enf_neutral(e)) {
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emit(mk_sconstructor_instr(0));
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} else if (is_enf_unreachable(e)) {
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emit(mk_unreachable_instr());
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} else if (n == get_nat_zero_name()) {
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emit(mk_num_instr(mpz(0)));
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} else if (auto idx = is_internal_cnstr(e)) {
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emit(mk_sconstructor_instr(*idx));
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} else if (optional<vm_decl> decl = get_vm_decl(m_env, n)) {
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compile_global(*decl, 0, nullptr, 0, name_map<unsigned>());
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} else {
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throw_unknown_constant(n);
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}
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}
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void compile_local(expr const & e, name_map<unsigned> const & m) {
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unsigned idx = *m.find(local_name(e));
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emit(mk_push_instr(idx));
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}
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void compile_cases_on(expr const & e, unsigned bpz, name_map<unsigned> const & m) {
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buffer<expr> args;
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expr fn = get_app_args(e, args);
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lean_assert(is_constant(fn));
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name const & fn_name = const_name(fn);
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unsigned num = get_vm_supported_cases_num_minors(m_env, fn);
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lean_assert(args.size() == num + 1);
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lean_assert(num >= 1);
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/** compile major premise */
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compile(args[0], bpz, m);
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unsigned cases_pos = next_pc();
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buffer<unsigned> cases_args;
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buffer<unsigned> goto_pcs;
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cases_args.resize(num, 0);
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if (fn_name == get_nat_cases_on_name()) {
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emit(mk_nat_cases_instr(0, 0));
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} else if (optional<unsigned> builtin_cases_idx = get_vm_builtin_cases_idx(m_env, fn_name)) {
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#if defined(__GNUC__) && !defined(__CLANG__)
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#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
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#endif
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emit(mk_builtin_cases_instr(*builtin_cases_idx, cases_args.size(), cases_args.data()));
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} else if (num == 1) {
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emit(mk_destruct_instr());
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} else if (num == 2) {
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emit(mk_cases2_instr(0, 0));
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} else {
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emit(mk_casesn_instr(cases_args.size(), cases_args.data()));
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}
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for (unsigned i = 1; i < args.size(); i++) {
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cases_args[i - 1] = next_pc();
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expr b = args[i];
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buffer<expr> locals;
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name_map<unsigned> new_m = m;
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unsigned new_bpz = bpz;
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while (is_lambda(b)) {
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name n = m_ngen.next();
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new_m.insert(n, new_bpz);
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locals.push_back(mk_local(n));
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new_bpz++;
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b = binding_body(b);
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}
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b = instantiate_rev(b, locals.size(), locals.data());
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compile(b, new_bpz, new_m);
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if (locals.size() > 0)
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emit(mk_drop_instr(locals.size()));
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// if it is not the last case, we need to use a goto
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if (i + 1 < args.size()) {
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goto_pcs.push_back(next_pc());
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emit(mk_goto_instr(0)); // fix later
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}
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}
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/* Fix cases instruction pc's */
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if (num >= 2 || get_vm_builtin_cases_idx(m_env, fn_name)) {
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for (unsigned i = 0; i < cases_args.size(); i++)
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m_code[cases_pos].set_pc(i, cases_args[i]);
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}
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unsigned end_pc = next_pc();
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/* Fix goto instruction pc's */
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for (unsigned i = 0; i < goto_pcs.size(); i++) {
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m_code[goto_pcs[i]].set_goto_pc(end_pc);
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}
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}
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void compile_cnstr(expr const & e, unsigned bpz, name_map<unsigned> const & m) {
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buffer<expr> args;
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expr const & fn = get_app_args(e, args);
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lean_assert(is_internal_cnstr(fn));
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unsigned cidx = *is_internal_cnstr(fn);
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compile_args(args.size(), args.data(), bpz, m);
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emit(mk_constructor_instr(cidx, get_app_num_args(e)));
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}
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void compile_external(name const & n, buffer<expr> & args, unsigned bpz, name_map<unsigned> const & m) {
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// Not sure if this is the best approach, trying to lazy load the required
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// dynamic libraries.
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std::cout << "external compile" << n << std::endl;
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optional<vm_decl> decl = get_vm_decl(m_env, n);
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lean_assert(decl);
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compile_global(*decl, args.size(), args.data(), bpz, m);
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}
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void compile_fn_call(expr const & e, unsigned bpz, name_map<unsigned> const & m) {
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buffer<expr> args;
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expr fn = get_app_args(e, args);
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if (!is_constant(fn)) {
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compile_rev_args(args.size(), args.data(), bpz, m);
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compile(fn, bpz + args.size(), m);
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emit_apply_instr(args.size());
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return;
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} else if (is_constant(fn)) {
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if (is_enf_neutral(fn)) {
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emit(mk_sconstructor_instr(0));
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} else if (is_enf_unreachable(fn)) {
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emit(mk_unreachable_instr());
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} else if (optional<vm_decl> decl = get_vm_decl(m_env, const_name(fn))) {
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compile_global(*decl, args.size(), args.data(), bpz, m);
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} else {
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throw_unknown_constant(const_name(fn));
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}
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} else {
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lean_unreachable();
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}
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}
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void compile_app(expr const & e, unsigned bpz, name_map<unsigned> const & m) {
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expr const & fn = get_app_fn(e);
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if (is_vm_supported_cases(m_env, fn)) {
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compile_cases_on(e, bpz, m);
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} else if (is_internal_cnstr(fn)) {
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compile_cnstr(e, bpz, m);
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} else if (is_sorry(e)) {
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compile_global(*get_vm_decl(m_env, "sorry"), 0, nullptr, bpz, m);
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} else {
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compile_fn_call(e, bpz, m);
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}
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}
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class elim_comp_irrelevant_marks_fn : public replace_visitor {
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virtual expr visit_mdata(expr const & e) override {
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return replace_visitor::visit_mdata(e);
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}
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};
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optional<expr> to_type_info(expr const & t) {
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if (!is_enf_neutral(t) && !has_loose_bvars(t) && !has_param_univ(t)) {
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return some_expr(elim_comp_irrelevant_marks_fn()(t));
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} else {
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return none_expr();
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}
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}
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void compile_let(expr e, unsigned bpz, name_map<unsigned> const & m) {
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unsigned counter = 0;
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buffer<expr> locals;
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name_map<unsigned> new_m = m;
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while (is_let(e)) {
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counter++;
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compile(instantiate_rev(let_value(e), locals.size(), locals.data()), bpz, new_m);
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emit(mk_local_info_instr(bpz, let_name(e), to_type_info(let_type(e))));
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name n = m_ngen.next();
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new_m.insert(n, bpz);
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locals.push_back(mk_local(n));
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bpz++;
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e = let_body(e);
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}
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lean_assert(counter > 0);
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compile(instantiate_rev(e, locals.size(), locals.data()), bpz, new_m);
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emit(mk_drop_instr(counter));
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}
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void compile_lit(expr const & e) {
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switch (lit_value(e).kind()) {
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case literal_kind::Nat:
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emit(mk_num_instr(lit_value(e).get_nat().to_mpz()));
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break;
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case literal_kind::String:
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emit(mk_string_instr(lit_value(e).get_string().to_std_string()));
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break;
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}
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}
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void compile_proj_cnstr(expr const & e, unsigned bpz, name_map<unsigned> const & m) {
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compile(proj_expr(e), bpz, m);
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emit(mk_proj_instr(proj_idx(e).get_small_value()));
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}
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void compile(expr const & e, unsigned bpz, name_map<unsigned> const & m) {
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switch (e.kind()) {
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case expr_kind::BVar: lean_unreachable();
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case expr_kind::Sort: lean_unreachable();
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case expr_kind::MVar: lean_unreachable();
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case expr_kind::Pi: lean_unreachable();
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case expr_kind::Lambda: lean_unreachable();
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case expr_kind::MData: compile(mdata_expr(e), bpz, m); break;
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case expr_kind::Proj: compile_proj_cnstr(e, bpz, m); break;
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case expr_kind::Const: compile_constant(e); break;
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case expr_kind::FVar: compile_local(e, m); break;
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case expr_kind::App: compile_app(e, bpz, m); break;
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case expr_kind::Let: compile_let(e, bpz, m); break;
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case expr_kind::Lit: compile_lit(e); break;
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}
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}
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unsigned get_arity(expr e) {
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unsigned r = 0;
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while (is_lambda(e)) {
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r++;
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e = binding_body(e);
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}
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return r;
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}
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public:
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emit_bytecode_fn(environment const & env, buffer<vm_instr> & code):
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m_env(env), m_code(code) {}
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pair<unsigned, list<vm_local_info>> operator()(expr e) {
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buffer<expr> locals;
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unsigned bpz = 0;
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unsigned arity = get_arity(e);
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unsigned i = arity;
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name_map<unsigned> m;
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list<vm_local_info> args_info;
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while (is_lambda(e)) {
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name n = m_ngen.next();
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i--;
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m.insert(n, i);
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locals.push_back(mk_local(n));
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bpz++;
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args_info = cons(vm_local_info(binding_name(e), to_type_info(binding_domain(e))), args_info);
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e = binding_body(e);
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}
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e = instantiate_rev(e, locals.size(), locals.data());
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compile(e, bpz, m);
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emit(mk_ret_instr());
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return mk_pair(arity, args_info);
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}
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};
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environment emit_bytecode(environment const & env, comp_decls const & ds) {
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environment new_env = env;
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for (comp_decl const & d : ds) {
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new_env = reserve_vm_index(new_env, d.fst(), d.snd());
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}
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for (comp_decl const & d : ds) {
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buffer<vm_instr> code;
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emit_bytecode_fn emitter(new_env, code);
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list<vm_local_info> args_info;
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unsigned arity;
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std::tie(arity, args_info) = emitter(d.snd());
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lean_trace(name({"compiler", "code_gen"}), tout() << " " << d.fst() << " " << arity << "\n";
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display_vm_code(tout().get_stream(), code.size(), code.data()););
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optimize(new_env, code);
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lean_trace(name({"compiler", "optimize_bytecode"}), tout() << " " << d.fst() << " " << arity << "\n";
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display_vm_code(tout().get_stream(), code.size(), code.data()););
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new_env = update_vm_code(new_env, d.fst(), code.size(), code.data(), args_info);
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}
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return new_env;
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}
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}
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