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vm.cpp
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vm.cpp
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/*
Copyright (c) 2016 Microsoft Corporation. All rights reserved.
Released under Apache 2.0 license as described in the file LICENSE.
Author: Leonardo de Moura
*/
#include <string>
#include <algorithm>
#include <vector>
#include <unordered_map>
#include <unordered_set>
#include <iomanip>
#include "util/timeit.h"
#include "util/flet.h"
#include "util/interrupt.h"
#include "util/sstream.h"
#include "util/small_object_allocator.h"
#include "util/sexpr/option_declarations.h"
#include "util/shared_mutex.h"
#include "util/hash.h"
#include "kernel/replace_fn.h"
#include "library/constants.h"
#include "library/kernel_serializer.h"
#include "library/trace.h"
#include "library/module.h"
#include "library/private.h"
#include "library/profiling.h"
#include "library/util.h"
#include "library/time_task.h"
#include "library/vm/vm.h"
#include "library/vm/vm_name.h"
#include "library/vm/vm_option.h"
#include "library/vm/vm_override.h"
#include "library/vm/vm_expr.h"
#include "library/vm/vm_string.h"
#include "library/normalize.h"
#include "library/string.h"
#ifndef LEAN_DEFAULT_PROFILER_FREQ
#define LEAN_DEFAULT_PROFILER_FREQ 1
#endif
namespace lean {
/* Reference to the VM that is currently running. */
LEAN_THREAD_VALUE(vm_state *, g_vm_state, nullptr);
void vm_obj_cell::dec_ref(vm_obj & o, buffer<vm_obj_cell*> & todelete) {
if (LEAN_VM_IS_PTR(o.m_data)) {
vm_obj_cell * c = o.steal_ptr();
if (c->dec_ref_core())
todelete.push_back(c);
}
}
MK_THREAD_LOCAL_GET(small_object_allocator, get_small_allocator, "vm object");
small_object_allocator & get_vm_allocator() {
return get_small_allocator();
}
vm_composite::vm_composite(vm_obj_kind k, unsigned idx, unsigned sz, vm_obj const * data):
vm_obj_cell(k), m_idx(idx), m_size(sz) {
vm_obj * fields = get_field_ptr();
std::uninitialized_copy(data, data + sz, fields);
}
static vm_obj mk_vm_composite(vm_obj_kind k, unsigned idx, unsigned sz, vm_obj const * data) {
lean_assert(k == vm_obj_kind::Constructor || k == vm_obj_kind::Closure);
return vm_obj(new (get_small_allocator().allocate(sizeof(vm_composite) + sz * sizeof(vm_obj))) vm_composite(k, idx, sz, data));
}
void vm_composite::dealloc(buffer<vm_obj_cell*> & todelete) {
unsigned sz = m_size;
vm_obj * fields = get_field_ptr();
for (unsigned i = 0; i < sz; i++) {
dec_ref(fields[i], todelete);
}
this->~vm_composite();
get_small_allocator().deallocate(sizeof(vm_composite) + sz * sizeof(vm_obj), this);
}
vm_obj mk_vm_constructor(unsigned cidx, unsigned sz, vm_obj const * data) {
if (g_vm_state && g_vm_state->profiling()) {
g_vm_state->inc_constructor_allocs();
}
return mk_vm_composite(vm_obj_kind::Constructor, cidx, sz, data);
}
vm_obj mk_vm_constructor(unsigned cidx, std::initializer_list<vm_obj const> args) {
return mk_vm_constructor(cidx, args.size(), args.begin());
}
vm_obj mk_vm_constructor(unsigned cidx, vm_obj const & o1) {
return mk_vm_constructor(cidx, 1, &o1);
}
vm_obj mk_vm_constructor(unsigned cidx, vm_obj const & o1, vm_obj const & o2) {
vm_obj args[2] = {o1, o2};
return mk_vm_constructor(cidx, 2, args);
}
vm_obj mk_vm_constructor(unsigned cidx, vm_obj const & o1, vm_obj const & o2, vm_obj const & o3) {
vm_obj args[3] = {o1, o2, o3};
return mk_vm_constructor(cidx, 3, args);
}
vm_obj mk_vm_constructor(unsigned cidx, vm_obj const & o1, vm_obj const & o2, vm_obj const & o3, vm_obj const & o4) {
vm_obj args[4] = {o1, o2, o3, o4};
return mk_vm_constructor(cidx, 4, args);
}
vm_obj mk_vm_constructor(unsigned cidx, vm_obj const & o1, vm_obj const & o2, vm_obj const & o3, vm_obj const & o4, vm_obj const & o5) {
vm_obj args[5] = {o1, o2, o3, o4, o5};
return mk_vm_constructor(cidx, 5, args);
}
vm_obj update_vm_constructor(vm_obj const & o, unsigned i, vm_obj const & v) {
lean_vm_check(i < csize(o));
if (o.raw()->get_rc() == 1) {
vm_obj * fs = const_cast<vm_obj*>(cfields(o));
fs[i] = v;
return o;
} else {
vm_obj r = mk_vm_constructor(cidx(o), csize(o), cfields(o));
vm_obj * fs = const_cast<vm_obj*>(cfields(r));
fs[i] = v;
return r;
}
}
vm_obj update_vm_pair(vm_obj const & o, vm_obj const & v_1, vm_obj const & v_2) {
lean_vm_check(csize(o) == 2);
if (o.raw()->get_rc() == 1) {
vm_obj * fs = const_cast<vm_obj*>(cfields(o));
fs[0] = v_1;
fs[1] = v_2;
return o;
} else {
return mk_vm_pair(v_1, v_2);
}
}
vm_obj mk_vm_closure(unsigned fn_idx, unsigned sz, vm_obj const * data) {
if (g_vm_state && g_vm_state->profiling()) {
g_vm_state->inc_closure_allocs();
}
return mk_vm_composite(vm_obj_kind::Closure, fn_idx, sz, data);
}
vm_obj mk_vm_closure(unsigned cidx, vm_obj const & o1) {
return mk_vm_closure(cidx, 1, &o1);
}
vm_obj mk_vm_closure(unsigned cidx, vm_obj const & o1, vm_obj const & o2) {
vm_obj args[2] = {o1, o2};
return mk_vm_closure(cidx, 2, args);
}
vm_obj mk_vm_closure(unsigned cidx, vm_obj const & o1, vm_obj const & o2, vm_obj const & o3) {
vm_obj args[3] = {o1, o2, o3};
return mk_vm_closure(cidx, 3, args);
}
vm_obj mk_vm_closure(unsigned cidx, vm_obj const & o1, vm_obj const & o2, vm_obj const & o3, vm_obj const & o4) {
vm_obj args[4] = {o1, o2, o3, o4};
return mk_vm_closure(cidx, 4, args);
}
vm_mpz::vm_mpz(mpz const & v):
vm_obj_cell(vm_obj_kind::MPZ),
m_value(v) {
if (g_vm_state && g_vm_state->profiling()) {
g_vm_state->inc_mpz_allocs();
}
}
vm_obj mk_vm_simple(unsigned v) {
return vm_obj(v);
}
vm_obj mk_vm_mpz(mpz const & v) {
return vm_obj(new (get_small_allocator().allocate(sizeof(vm_mpz))) vm_mpz(v));
}
void vm_mpz::dealloc() {
this->~vm_mpz();
get_small_allocator().deallocate(sizeof(vm_mpz), this);
}
/* TODO(Leo, Jared): delete mk_native_closure that takes environment as argument */
vm_obj mk_native_closure(environment const & env, name const & n, std::initializer_list<vm_obj const> args) {
return mk_native_closure(env, n, args.size(), args.begin());
}
vm_obj mk_native_closure(environment const & /* env */, name const & n, unsigned /* sz */, vm_obj const * /* data */) {
return get_vm_state().get_constant(n);
}
vm_native_closure::vm_native_closure(vm_cfunction fn, unsigned arity, unsigned num_args, vm_obj const * args):
vm_obj_cell(vm_obj_kind::NativeClosure), m_fn(fn), m_arity(arity), m_num_args(num_args) {
/* If the following assertion fails, then it is not necessary to create a closure */
lean_assert(arity > num_args);
vm_obj * new_args = get_args_ptr();
std::uninitialized_copy(args, args + num_args, new_args);
}
void vm_native_closure::dealloc(buffer<vm_obj_cell*> & todelete) {
vm_obj * args = get_args_ptr();
unsigned nargs = m_num_args;
for (unsigned i = 0; i < nargs; i++) {
dec_ref(args[i], todelete);
}
this->~vm_native_closure();
get_small_allocator().deallocate(sizeof(vm_native_closure) + nargs * sizeof(vm_obj), this);
}
vm_obj mk_native_closure(vm_cfunction fn, unsigned arity, unsigned num_args, vm_obj const * args) {
return vm_obj(new (get_small_allocator().allocate(sizeof(vm_native_closure) + num_args * sizeof(vm_obj))) vm_native_closure(fn, arity, num_args, args));
}
vm_obj mk_native_closure(vm_cfunction fn, unsigned arity, std::initializer_list<vm_obj> const & args) {
return mk_native_closure(fn, arity, args.size(), args.begin());
}
vm_obj mk_native_closure(vm_cfunction_1 fn, unsigned num_args, vm_obj const * args) {
return mk_native_closure(reinterpret_cast<vm_cfunction>(fn), 1, num_args, args);
}
vm_obj mk_native_closure(vm_cfunction_2 fn, unsigned num_args, vm_obj const * args) {
return mk_native_closure(reinterpret_cast<vm_cfunction>(fn), 2, num_args, args);
}
vm_obj mk_native_closure(vm_cfunction_3 fn, unsigned num_args, vm_obj const * args) {
return mk_native_closure(reinterpret_cast<vm_cfunction>(fn), 3, num_args, args);
}
vm_obj mk_native_closure(vm_cfunction_4 fn, unsigned num_args, vm_obj const * args) {
return mk_native_closure(reinterpret_cast<vm_cfunction>(fn), 4, num_args, args);
}
vm_obj mk_native_closure(vm_cfunction_5 fn, unsigned num_args, vm_obj const * args) {
return mk_native_closure(reinterpret_cast<vm_cfunction>(fn), 5, num_args, args);
}
vm_obj mk_native_closure(vm_cfunction_6 fn, unsigned num_args, vm_obj const * args) {
return mk_native_closure(reinterpret_cast<vm_cfunction>(fn), 6, num_args, args);
}
vm_obj mk_native_closure(vm_cfunction_7 fn, unsigned num_args, vm_obj const * args) {
return mk_native_closure(reinterpret_cast<vm_cfunction>(fn), 7, num_args, args);
}
vm_obj mk_native_closure(vm_cfunction_8 fn, unsigned num_args, vm_obj const * args) {
return mk_native_closure(reinterpret_cast<vm_cfunction>(fn), 8, num_args, args);
}
vm_obj mk_native_closure(vm_cfunction_N fn, unsigned arity, unsigned num_args, vm_obj const * args) {
return mk_native_closure(reinterpret_cast<vm_cfunction>(fn), arity, num_args, args);
}
vm_obj mk_native_closure(vm_cfunction_1 fn, std::initializer_list<vm_obj> const & args) {
return mk_native_closure(fn, args.size(), args.begin());
}
vm_obj mk_native_closure(vm_cfunction_2 fn, std::initializer_list<vm_obj> const & args) {
return mk_native_closure(fn, args.size(), args.begin());
}
vm_obj mk_native_closure(vm_cfunction_3 fn, std::initializer_list<vm_obj> const & args) {
return mk_native_closure(fn, args.size(), args.begin());
}
vm_obj mk_native_closure(vm_cfunction_4 fn, std::initializer_list<vm_obj> const & args) {
return mk_native_closure(fn, args.size(), args.begin());
}
vm_obj mk_native_closure(vm_cfunction_5 fn, std::initializer_list<vm_obj> const & args) {
return mk_native_closure(fn, args.size(), args.begin());
}
vm_obj mk_native_closure(vm_cfunction_6 fn, std::initializer_list<vm_obj> const & args) {
return mk_native_closure(fn, args.size(), args.begin());
}
vm_obj mk_native_closure(vm_cfunction_7 fn, std::initializer_list<vm_obj> const & args) {
return mk_native_closure(fn, args.size(), args.begin());
}
vm_obj mk_native_closure(vm_cfunction_8 fn, std::initializer_list<vm_obj> const & args) {
return mk_native_closure(fn, args.size(), args.begin());
}
vm_obj mk_native_closure(vm_cfunction_N fn, unsigned arity, std::initializer_list<vm_obj> const & args) {
return mk_native_closure(fn, arity, args.size(), args.begin());
}
void vm_obj_cell::dealloc() {
try {
buffer<vm_obj_cell*> todo;
todo.push_back(this);
while (!todo.empty()) {
vm_obj_cell * it = todo.back();
todo.pop_back();
lean_assert(it->get_rc() == 0);
switch (it->kind()) {
case vm_obj_kind::Simple: lean_unreachable();
case vm_obj_kind::Constructor: to_composite(it)->dealloc(todo); break;
case vm_obj_kind::Closure: to_composite(it)->dealloc(todo); break;
case vm_obj_kind::MPZ: to_mpz_core(it)->dealloc(); break;
case vm_obj_kind::External: to_external(it)->dealloc(); break;
case vm_obj_kind::NativeClosure: to_native_closure(it)->dealloc(todo); break;
}
}
} catch (std::bad_alloc&) {
// We need this catch, because push_back may fail when expanding the buffer.
// In this case, we avoid the crash, and "accept" the memory leak.
}
}
unsigned hash(vm_obj const & o) {
check_system("hash(vm_obj)");
unsigned int h = 555; // just a seed for the hash
h = hash(h, (unsigned int)(kind(o)));
if (is_simple(o)) {
return hash(h, (unsigned int)(0));
} else if (is_constructor(o) || is_closure(o)) {
h = hash(h, is_closure(o) ? cfn_idx(o) : cidx(o));
for (unsigned i = 0; i < csize(o); i++) {
h = hash(h, hash(cfield(o, i)));
}
return h;
} else if (is_mpz(o)) {
return hash(h, to_mpz(o).hash());
} else if (is_external(o)) {
unsigned int oh = to_external(o)->hash();
return oh;
} else if (is_native_closure(o)) {
auto nc = to_native_closure(o);
h = hash_ptr(nc->get_fn());
vm_obj const * args = nc->get_args();
for (unsigned i = 0; i < nc->get_num_args(); i++) {
h = hash(h, hash(args[i]));
}
return h;
} else { // unknown
return h;
}
}
void display(std::ostream & out, vm_obj const & o) {
if (is_simple(o)) {
out << "#" << cidx(o);
} else if (is_constructor(o)) {
out << "(#" << cidx(o);
for (unsigned i = 0; i < csize(o); i++) {
out << " ";
display(out, cfield(o, i));
}
out << ")";
} else if (is_mpz(o)) {
out << to_mpz(o);
} else if (is_external(o)) {
out << "[external]";
} else if (is_closure(o)) {
if (auto n = find_vm_name(cfn_idx(o))) {
out << "(" << *n;
} else {
out << "(fn#" << cfn_idx(o);
}
for (unsigned i = 0; i < csize(o); i++) {
out << " ";
display(out, cfield(o, i));
}
out << ")";
} else if (is_native_closure(o)) {
out << "([native_closure]";
vm_obj const * args = to_native_closure(o)->get_args();
for (unsigned i = 0; i < to_native_closure(o)->get_num_args(); i++) {
out << " ";
display(out, args[i]);
}
out << ")";
} else {
out << "[unknown]";
}
}
struct vm_obj_cell_hash {
unsigned operator()(vm_obj_cell const * o) const { return hash_ptr(o); }
};
struct vm_obj_cell_eq {
bool operator()(vm_obj_cell const * o1, vm_obj_cell const * o2) const { return o1 == o2; }
};
struct ts_vm_obj::to_ts_vm_obj_fn {
std::unordered_map<vm_obj_cell *, vm_obj, vm_obj_cell_hash, vm_obj_cell_eq> m_cache;
std::vector<vm_obj_cell*> & m_objs;
vm_clone_fn m_fn;
void * alloc_composite(unsigned sz) {
return new char[sizeof(vm_composite) + sz * sizeof(vm_obj)];
}
void * alloc_native_closure(unsigned num_args) {
return new char[sizeof(vm_native_closure) + num_args * sizeof(vm_obj)];
}
vm_obj visit_constructor(vm_obj const & o) {
buffer<vm_obj> fields;
for (unsigned i = 0; i < csize(o); i++)
fields.push_back(visit(cfield(o, i)));
return vm_obj(new (alloc_composite(fields.size())) vm_composite(vm_obj_kind::Constructor, cidx(o), fields.size(), fields.data()));
}
vm_obj visit_closure(vm_obj const & o) {
buffer<vm_obj> fields;
for (unsigned i = 0; i < csize(o); i++)
fields.push_back(visit(cfield(o, i)));
return vm_obj(new (alloc_composite(fields.size())) vm_composite(vm_obj_kind::Closure, cfn_idx(o), fields.size(), fields.data()));
}
vm_obj visit_mpz(vm_obj const & o) {
return vm_obj(new vm_mpz(to_mpz(o)));
}
vm_obj visit_external(vm_obj const & o) {
return mk_vm_external(to_external(o)->ts_clone(m_fn));
}
vm_obj visit_native_closure(vm_obj const & o) {
vm_native_closure * cell = to_native_closure(o);
buffer<vm_obj> args;
unsigned nargs = cell->get_num_args();
for (unsigned i = 0; i < nargs; i++)
args.push_back(visit(cell->get_args()[i]));
return vm_obj(new (alloc_native_closure(nargs)) vm_native_closure(cell->get_fn(), cell->get_arity(),
nargs, args.data()));
}
vm_obj visit(vm_obj const & o) {
if (is_simple(o)) return o;
auto it = m_cache.find(o.raw());
if (it != m_cache.end())
return it->second;
vm_obj r;
switch (o.kind()) {
case vm_obj_kind::Simple: lean_unreachable();
case vm_obj_kind::Constructor: r = visit_constructor(o); break;
case vm_obj_kind::Closure: r = visit_closure(o); break;
case vm_obj_kind::MPZ: r = visit_mpz(o); break;
case vm_obj_kind::External: r = visit_external(o); break;
case vm_obj_kind::NativeClosure: r = visit_native_closure(o); break;
}
// Leak r so that the vm_obj destructor is never called.
// We use a different allocator here so it needs to be deallocated in ts_vm_obj::data::~data
m_objs.push_back(vm_obj(r).steal_ptr());
m_cache.insert(mk_pair(o.raw(), r));
return r;
}
to_ts_vm_obj_fn(std::vector<vm_obj_cell*> & objs):
m_objs(objs), m_fn([&](vm_obj const & o) { return visit(o); }) {}
vm_obj operator()(vm_obj const & o) { return visit(o); }
};
ts_vm_obj::ts_vm_obj(vm_obj const & o) {
m_data = std::make_shared<data>();
m_data->m_root = to_ts_vm_obj_fn(m_data->m_objs)(o);
}
ts_vm_obj::data::~data() {
if (!is_simple(m_root)) steal_ptr(m_root);
for (vm_obj_cell * cell : m_objs) {
switch (cell->kind()) {
case vm_obj_kind::Simple:
/* We should not use lean_unreachable, since it throws an exception, and
some compiler complain about code that may throw exceptions in destructors.
*/
lean_assert(false);
break;
case vm_obj_kind::Constructor:
case vm_obj_kind::Closure:
static_cast<vm_composite*>(cell)->~vm_composite();
delete[] reinterpret_cast<char*>(cell);
break;
case vm_obj_kind::MPZ:
delete static_cast<vm_mpz*>(cell);
break;
case vm_obj_kind::External:
delete static_cast<vm_external*>(cell);
break;
case vm_obj_kind::NativeClosure:
static_cast<vm_native_closure*>(cell)->~vm_native_closure();
delete[] reinterpret_cast<char*>(cell);
break;
}
}
}
struct ts_vm_obj::to_vm_obj_fn {
std::unordered_map<vm_obj_cell *, vm_obj, vm_obj_cell_hash, vm_obj_cell_eq> m_cache;
vm_clone_fn m_fn;
vm_obj visit_constructor(vm_obj const & o) {
buffer<vm_obj> fields;
for (unsigned i = 0; i < csize(o); i++)
fields.push_back(visit(cfield(o, i)));
return mk_vm_constructor(cidx(o), fields.size(), fields.data());
}
vm_obj visit_closure(vm_obj const & o) {
buffer<vm_obj> fields;
for (unsigned i = 0; i < csize(o); i++)
fields.push_back(visit(cfield(o, i)));
return mk_vm_closure(cfn_idx(o), fields.size(), fields.data());
}
vm_obj visit_mpz(vm_obj const & o) {
return mk_vm_mpz(to_mpz(o));
}
vm_obj visit_external(vm_obj const & o) {
return mk_vm_external(to_external(o)->clone(m_fn));
}
vm_obj visit_native_closure(vm_obj const & o) {
vm_native_closure * cell = to_native_closure(o);
buffer<vm_obj> args;
for (unsigned i = 0; i < cell->get_num_args(); i++)
args.push_back(visit(cell->get_args()[i]));
return mk_native_closure(cell->get_fn(), cell->get_arity(), args.size(), args.data());
}
vm_obj visit(vm_obj const & o) {
if (is_simple(o)) return o;
auto it = m_cache.find(o.raw());
if (it != m_cache.end())
return it->second;
vm_obj r;
switch (o.kind()) {
case vm_obj_kind::Simple: lean_unreachable();
case vm_obj_kind::Constructor: r = visit_constructor(o); break;
case vm_obj_kind::Closure: r = visit_closure(o); break;
case vm_obj_kind::MPZ: r = visit_mpz(o); break;
case vm_obj_kind::External: r = visit_external(o); break;
case vm_obj_kind::NativeClosure: r = visit_native_closure(o); break;
}
m_cache.insert(mk_pair(o.raw(), r));
return r;
}
vm_obj operator()(vm_obj const & o) { return visit(o); }
to_vm_obj_fn():m_fn([&](vm_obj const & o) { return visit(o); }) {}
};
vm_obj ts_vm_obj::to_vm_obj() const {
return to_vm_obj_fn()(m_data->m_root);
}
static void display_fn(std::ostream & out, unsigned fn_idx) {
if (auto r = find_vm_name(fn_idx))
out << *r;
else
out << fn_idx;
}
static void display_builtin_cases(std::ostream & out, unsigned cases_idx) {
display_fn(out, cases_idx);
}
void vm_instr::display(std::ostream & out) const {
switch (m_op) {
case opcode::Push: out << "push " << m_idx; break;
case opcode::Move: out << "move " << m_idx; break;
case opcode::Ret: out << "ret"; break;
case opcode::Drop: out << "drop " << m_num; break;
case opcode::Goto: out << "goto " << m_pc[0]; break;
case opcode::SConstructor: out << "scnstr #" << m_cidx; break;
case opcode::String: out << "string " << quote_string_literal(*m_string); break;
case opcode::Constructor: out << "cnstr #" << m_cidx << " " << m_nfields; break;
case opcode::Num: out << "num " << *m_mpz; break;
case opcode::Unreachable: out << "unreachable"; break;
case opcode::Destruct: out << "destruct"; break;
case opcode::Cases2: out << "cases2 " << m_pc[1]; break;
case opcode::CasesN:
out << "cases";
for (unsigned i = 0; i < get_casesn_size(); i++)
out << " " << get_casesn_pc(i);
break;
case opcode::BuiltinCases:
out << "builtin_cases ";
display_builtin_cases(out, get_cases_idx());
out << ",";
for (unsigned i = 0; i < get_casesn_size(); i++)
out << " " << get_casesn_pc(i);
break;
case opcode::NatCases: out << "nat_cases " << m_pc[1]; break;
case opcode::Proj: out << "proj " << m_idx; break;
case opcode::Apply: out << "apply"; break;
case opcode::InvokeGlobal:
out << "ginvoke ";
display_fn(out, m_fn_idx);
break;
case opcode::InvokeBuiltin:
out << "builtin ";
display_fn(out, m_fn_idx);
break;
case opcode::InvokeCFun:
out << "cfun ";
display_fn(out, m_fn_idx);
break;
case opcode::Closure:
out << "closure ";
display_fn(out, m_fn_idx);
out << " " << m_nargs;
break;
case opcode::Expr:
out << "pexpr " << *m_expr; break;
case opcode::LocalInfo:
out << "localinfo " << m_local_info->first << " @ " << m_local_idx; break;
}
}
unsigned vm_instr::get_num_pcs() const {
switch (m_op) {
case opcode::Goto:
return 1;
case opcode::Cases2: case opcode::NatCases:
return 2;
case opcode::CasesN: case opcode::BuiltinCases:
return get_casesn_size();
default:
return 0;
}
}
unsigned vm_instr::get_pc(unsigned i) const {
lean_assert(i < get_num_pcs());
switch (m_op) {
case opcode::Goto:
case opcode::Cases2: case opcode::NatCases:
return m_pc[i];
case opcode::CasesN: case opcode::BuiltinCases:
return get_casesn_pc(i);
default:
lean_unreachable();
}
}
void vm_instr::set_pc(unsigned i, unsigned pc) {
lean_assert(i < get_num_pcs());
switch (m_op) {
case opcode::Goto:
case opcode::Cases2: case opcode::NatCases:
m_pc[i] = pc;
break;
case opcode::CasesN: case opcode::BuiltinCases:
set_casesn_pc(i, pc);
break;
default:
lean_unreachable();
}
}
vm_instr mk_push_instr(unsigned idx) {
vm_instr r(opcode::Push);
r.m_idx = idx;
return r;
};
vm_instr mk_move_instr(unsigned idx) {
vm_instr r(opcode::Move);
r.m_idx = idx;
return r;
};
vm_instr mk_drop_instr(unsigned n) {
vm_instr r(opcode::Drop);
r.m_num = n;
return r;
}
vm_instr mk_proj_instr(unsigned n) {
vm_instr r(opcode::Proj);
r.m_idx = n;
return r;
}
vm_instr mk_goto_instr(unsigned pc) {
vm_instr r(opcode::Goto);
r.m_pc[0] = pc;
return r;
}
vm_instr mk_sconstructor_instr(unsigned cidx) {
vm_instr r(opcode::SConstructor);
r.m_cidx = cidx;
return r;
}
vm_instr mk_constructor_instr(unsigned cidx, unsigned nfields) {
vm_instr r(opcode::Constructor);
r.m_cidx = cidx;
r.m_nfields = nfields;
return r;
}
vm_instr mk_num_instr(mpz const & v) {
if (v < LEAN_MAX_SMALL_NAT) {
vm_instr r(opcode::SConstructor);
r.m_num = static_cast<unsigned>(v);
return r;
} else {
vm_instr r(opcode::Num);
r.m_mpz = new mpz(v);
return r;
}
}
vm_instr mk_expr_instr(expr const &v) {
vm_instr r(opcode::Expr);
r.m_expr = new expr(v);
return r;
}
vm_instr mk_string_instr(std::string const & v) {
vm_instr r(opcode::String);
r.m_string = new std::string(v);
return r;
}
vm_instr mk_local_info_instr(unsigned idx, name const & n, optional<expr> const & e) {
vm_instr r(opcode::LocalInfo);
r.m_local_idx = idx;
r.m_local_info = new vm_local_info(n, e);
return r;
}
vm_instr mk_ret_instr() { return vm_instr(opcode::Ret); }
vm_instr mk_destruct_instr() { return vm_instr(opcode::Destruct); }
vm_instr mk_unreachable_instr() { return vm_instr(opcode::Unreachable); }
vm_instr mk_apply_instr() { return vm_instr(opcode::Apply); }
vm_instr mk_nat_cases_instr(unsigned pc1, unsigned pc2) {
vm_instr r(opcode::NatCases);
r.m_pc[0] = pc1;
r.m_pc[1] = pc2;
return r;
}
vm_instr mk_cases2_instr(unsigned pc1, unsigned pc2) {
vm_instr r(opcode::Cases2);
r.m_pc[0] = pc1;
r.m_pc[1] = pc2;
return r;
}
vm_instr mk_casesn_instr(unsigned num_pc, unsigned const * pcs) {
lean_assert(num_pc >= 2);
vm_instr r(opcode::CasesN);
r.m_cases_idx = 0; /* not really needed, but it avoids a valgrind warning. */
r.m_npcs = new unsigned[num_pc + 1];
r.m_npcs[0] = num_pc;
for (unsigned i = 0; i < num_pc; i++)
r.m_npcs[i+1] = pcs[i];
return r;
}
vm_instr mk_builtin_cases_instr(unsigned cases_idx, unsigned num_pc, unsigned const * pcs) {
vm_instr r(opcode::BuiltinCases);
r.m_cases_idx = cases_idx;
r.m_npcs = new unsigned[num_pc + 1];
r.m_npcs[0] = num_pc;
for (unsigned i = 0; i < num_pc; i++)
r.m_npcs[i+1] = pcs[i];
return r;
}
vm_instr mk_invoke_global_instr(unsigned fn_idx) {
vm_instr r(opcode::InvokeGlobal);
r.m_fn_idx = fn_idx;
return r;
}
vm_instr mk_invoke_builtin_instr(unsigned fn_idx) {
vm_instr r(opcode::InvokeBuiltin);
r.m_fn_idx = fn_idx;
return r;
}
vm_instr mk_invoke_cfun_instr(unsigned fn_idx) {
vm_instr r(opcode::InvokeCFun);
r.m_fn_idx = fn_idx;
return r;
}
vm_instr mk_closure_instr(unsigned fn_idx, unsigned n) {
vm_instr r(opcode::Closure);
r.m_fn_idx = fn_idx;
r.m_nargs = n;
return r;
}
void vm_instr::release_memory() {
switch (m_op) {
case opcode::CasesN:
case opcode::BuiltinCases:
delete[] m_npcs;
break;
case opcode::Num:
delete m_mpz;
break;
case opcode::Expr:
delete m_expr;
break;
case opcode::LocalInfo:
delete m_local_info;
break;
case opcode::String:
delete m_string;
break;
default:
break;
}
}
void vm_instr::copy_args(vm_instr const & i) {
switch (i.m_op) {
case opcode::InvokeGlobal: case opcode::InvokeBuiltin: case opcode::InvokeCFun:
m_fn_idx = i.m_fn_idx;
break;
case opcode::Closure:
m_fn_idx = i.m_fn_idx;
m_nargs = i.m_nargs;
break;
case opcode::Push: case opcode::Move: case opcode::Proj:
m_idx = i.m_idx;
break;
case opcode::Drop:
m_num = i.m_num;
break;
case opcode::Goto:
m_pc[0] = i.m_pc[0];
break;
case opcode::Cases2: case opcode::NatCases:
m_pc[0] = i.m_pc[0];
m_pc[1] = i.m_pc[1];
break;
case opcode::CasesN:
case opcode::BuiltinCases:
m_npcs = new unsigned[i.m_npcs[0] + 1];
for (unsigned j = 0; j < i.m_npcs[0] + 1; j++)
m_npcs[j] = i.m_npcs[j];
m_cases_idx = i.m_cases_idx;
break;
case opcode::SConstructor:
m_cidx = i.m_cidx;
break;
case opcode::Constructor:
m_cidx = i.m_cidx;
m_nfields = i.m_nfields;
break;
case opcode::Num:
m_mpz = new mpz(*i.m_mpz);
break;
case opcode::Expr:
m_expr = new expr(*i.m_expr);
break;
case opcode::String:
m_string = new std::string(*i.m_string);
break;
case opcode::LocalInfo:
m_local_idx = i.m_local_idx;
m_local_info = new vm_local_info(*i.m_local_info);
break;
case opcode::Ret: case opcode::Destruct:
case opcode::Unreachable: case opcode::Apply:
break;
}
}
vm_instr::vm_instr(vm_instr const & i):
m_op(i.m_op) {
copy_args(i);
}
vm_instr::vm_instr(vm_instr && i):
m_op(i.m_op) {
switch (m_op) {
case opcode::Num:
m_mpz = i.m_mpz;
i.m_mpz = nullptr;
break;
case opcode::CasesN: case opcode::BuiltinCases:
m_npcs = i.m_npcs;
m_cases_idx = i.m_cases_idx;
i.m_npcs = nullptr;
break;
default:
copy_args(i);
break;
}
}
vm_instr::~vm_instr() {
release_memory();
}
vm_instr & vm_instr::operator=(vm_instr const & s) {
release_memory();
m_op = s.m_op;
copy_args(s);
return *this;
}
vm_instr & vm_instr::operator=(vm_instr && s) {
release_memory();
m_op = s.m_op;
switch (m_op) {
case opcode::Num:
m_mpz = s.m_mpz;
s.m_mpz = nullptr;
break;
case opcode::CasesN: case opcode::BuiltinCases:
m_cases_idx = s.m_cases_idx;
m_npcs = s.m_npcs;
s.m_npcs = nullptr;
break;
default:
copy_args(s);
break;
}
return *this;
}
void vm_instr::serialize(serializer & s, std::function<name(unsigned)> const & idx2name) const {
s << static_cast<char>(m_op);
switch (m_op) {
case opcode::InvokeGlobal: case opcode::InvokeBuiltin: case opcode::InvokeCFun:
s << idx2name(m_fn_idx);
break;
case opcode::Closure:
s << idx2name(m_fn_idx) << m_nargs;
break;
case opcode::Push: case opcode::Move: case opcode::Proj:
s << m_idx;
break;
case opcode::Drop:
s << m_num;
break;
case opcode::Goto:
s << m_pc[0];
break;
case opcode::Cases2: case opcode::NatCases:
s << m_pc[0];
s << m_pc[1];
break;
case opcode::BuiltinCases:
s << idx2name(m_cases_idx);
/* fall-thru */
case opcode::CasesN:
s << m_npcs[0];
for (unsigned j = 1; j < m_npcs[0] + 1; j++)
s << m_npcs[j];
break;
case opcode::SConstructor:
s << m_cidx;
break;
case opcode::Constructor:
s << m_cidx << m_nfields;
break;
case opcode::Num:
s << *m_mpz;
break;
case opcode::Expr:
s << *m_expr;
break;
case opcode::String:
s << *m_string;
break;
case opcode::LocalInfo:
s << m_local_idx << m_local_info->first << m_local_info->second;
break;
case opcode::Ret: case opcode::Destruct:
case opcode::Unreachable: case opcode::Apply:
break;
}
}
static unsigned read_fn_idx(deserializer & d) {
name n;
d >> n;
return get_vm_index(n);