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tc_analyze.c
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tc_analyze.c
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/*
* CEKF - VM supporting amb
* Copyright (C) 2022-2023 Bill Hails
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include "tc_analyze.h"
#include "symbols.h"
#include "symbol.h"
#include "memory.h"
#include "hash.h"
#include "tc_debug.h"
#include "tc_helper.h"
#include "print_compiler.h"
#include "lambda_pp.h"
#include "types.h"
#ifdef DEBUG_TC
# include "debugging_on.h"
# include "lambda_pp.h"
#else
# include "debugging_off.h"
#endif
static void addToEnv(TcEnv *env, HashSymbol *key, TcType *type);
static void addToNg(TcNg *env, TcType *type);
static void addFreshVarToEnv(TcEnv *env, HashSymbol *key);
static void addCmpToEnv(TcEnv *env, HashSymbol *key);
static void addBuiltinsToEnv(TcEnv *env, BuiltIns *builtIns);
static void addNamespacesToEnv(TcEnv *env);
static TcType *makeSpaceship(void);
static TcType *makeSmallInteger(void);
static TcType *makeBigInteger(void);
static TcType *makeCharacter(void);
static TcType *makeUnknown(HashSymbol *var);
static TcType *makeVar(HashSymbol *t);
static TcType *makeFn(TcType *arg, TcType *result);
static TcType *makeTuple(int size);
static void addHereToEnv(TcEnv *env);
static void addIfToEnv(TcEnv *env);
static void addIntBinOpToEnv(TcEnv *env, HashSymbol *symbol);
static void addNegToEnv(TcEnv *env);
static void addNotToEnv(TcEnv *env);
static void addThenToEnv(TcEnv *env);
static TcType *analyzeExp(LamExp *exp, TcEnv *env, TcNg *ng);
static TcType *analyzeLam(LamLam *lam, TcEnv *env, TcNg *ng);
static TcType *analyzeVar(ParserInfo I, HashSymbol *var, TcEnv *env, TcNg *ng);
static TcType *analyzeSmallInteger();
static TcType *analyzeBigInteger();
static TcType *analyzePrim(LamPrimApp *app, TcEnv *env, TcNg *ng);
static TcType *analyzeSequence(LamSequence *sequence, TcEnv *env, TcNg *ng);
static TcType *analyzeConstruct(LamConstruct *construct, TcEnv *env, TcNg *ng);
static TcType *analyzeDeconstruct(LamDeconstruct *deconstruct, TcEnv *env, TcNg *ng);
static TcType *analyzeTag(LamExp *tag, TcEnv *env, TcNg *ng);
static TcType *analyzeConstant(LamConstant *constant, TcEnv *env, TcNg *ng);
static TcType *analyzeApply(LamApply *apply, TcEnv *env, TcNg *ng);
static TcType *analyzeIff(LamIff *iff, TcEnv *env, TcNg *ng);
static TcType *analyzeCallCC(LamExp *called, TcEnv *env, TcNg *ng);
static TcType *analyzePrint(LamPrint *print, TcEnv *env, TcNg *ng);
static TcType *analyzeLetRec(LamLetRec *letRec, TcEnv *env, TcNg *ng);
static TcType *analyzeTypeDefs(LamTypeDefs *typeDefs, TcEnv *env, TcNg *ng);
static TcType *analyzeLet(LamLet *let, TcEnv *env, TcNg *ng);
static TcType *analyzeMatch(LamMatch *match, TcEnv *env, TcNg *ng);
static TcType *analyzeCond(LamCond *cond, TcEnv *env, TcNg *ng);
static TcType *analyzeAmb(LamAmb *amb, TcEnv *env, TcNg *ng);
static TcType *analyzeTupleIndex(LamTupleIndex *index, TcEnv *env, TcNg *ng);
static TcType *analyzeMakeTuple(LamArgs *tuple, TcEnv *env, TcNg *ng);
static TcType *analyzeNamespaces(LamNamespaceArray *nsArray, TcEnv *env, TcNg *ng);
static TcType *analyzeCharacter();
static TcType *analyzeBack();
static TcType *analyzeError();
static TcType *analyzeEnv(TcEnv *env);
static bool unify(TcType *a, TcType *b, char *trace __attribute__((unused)));
static TcType *prune(TcType *t);
static bool occursInType(TcType *a, TcType *b);
static bool occursIn(TcType *a, TcType *b);
static bool sameType(TcType *a, TcType *b);
static TcType *analyzeBigIntegerExp(LamExp *exp, TcEnv *env, TcNg *ng);
static TcType *analyzeSmallIntegerExp(LamExp *exp, TcEnv *env, TcNg *ng) __attribute__((unused));
static TcType *analyzeBooleanExp(LamExp *exp, TcEnv *env, TcNg *ng);
static TcType *freshRec(TcType *type, TcNg *ng, TcTypeTable *map);
static TcType *lookup(TcEnv *env, HashSymbol *symbol, TcNg *ng);
static TcType *analyzeLookup(LamLookup *, TcEnv *, TcNg *);
static TcType *lookupConstructorType(HashSymbol *name, int namespace, TcEnv *env, TcNg *ng);
static void addUserTypeToEnv(TcEnv *env, HashSymbol *symbol, TcUserType *type);
bool getUserTypeFromTcEnv(TcEnv *env, HashSymbol *symbol, TcUserType **type);
static int id_counter = 0;
TcEnv *tc_init(BuiltIns *builtIns) {
TcEnv *env = newTcEnv(NULL);
int save = PROTECT(env);
addCmpToEnv(env, eqSymbol());
addCmpToEnv(env, geSymbol());
addCmpToEnv(env, gtSymbol());
addCmpToEnv(env, leSymbol());
addCmpToEnv(env, ltSymbol());
addCmpToEnv(env, neSymbol());
addFreshVarToEnv(env, backSymbol());
addFreshVarToEnv(env, errorSymbol());
addHereToEnv(env);
addIfToEnv(env);
addIntBinOpToEnv(env, addSymbol());
addIntBinOpToEnv(env, divSymbol());
addIntBinOpToEnv(env, mulSymbol());
addIntBinOpToEnv(env, powSymbol());
addIntBinOpToEnv(env, subSymbol());
addNegToEnv(env);
addNotToEnv(env);
addThenToEnv(env);
addBuiltinsToEnv(env, builtIns);
addNamespacesToEnv(env);
UNPROTECT(save);
return env;
}
TcType *tc_analyze(LamExp *exp, TcEnv *env) {
TcNg *ng = newTcNg(NULL);
int save = PROTECT(ng);
TcType *nsType = newTcType_Nsid(NS_GLOBAL); // global ns
PROTECT(nsType);
addToEnv(env, namespaceSymbol(), nsType);
TcType *res = analyzeExp(exp, env, ng);
UNPROTECT(save);
return res;
}
TcType *makeListType(TcType *content) {
TcUserTypeArgs *args = newTcUserTypeArgs(content, NULL);
int save = PROTECT(args);
TcUserType *userType = newTcUserType(newSymbol("list"), args, -1);
PROTECT(userType);
TcType *res = newTcType_UserType(userType);
UNPROTECT(save);
return res;
}
TcType *makeMaybeType(TcType *content) {
TcUserTypeArgs *args = newTcUserTypeArgs(content, NULL);
int save = PROTECT(args);
TcUserType *userType = newTcUserType(newSymbol("maybe"), args, -1);
PROTECT(userType);
TcType *res = newTcType_UserType(userType);
UNPROTECT(save);
return res;
}
TcType *makeMaybeStringType() {
TcType *stringType = makeStringType();
int save = PROTECT(stringType);
TcType *maybeStringType = makeMaybeType(stringType);
UNPROTECT(save);
return maybeStringType;
}
TcType *makeTryType(TcType *failure, TcType *success) {
TcUserTypeArgs *args = newTcUserTypeArgs(success, NULL);
int save = PROTECT(args);
args = newTcUserTypeArgs(failure, args);
PROTECT(args);
TcUserType *userType = newTcUserType(newSymbol("try"), args, -1);
PROTECT(userType);
TcType *res = newTcType_UserType(userType);
UNPROTECT(save);
return res;
}
TcType *makeStringType(void) {
TcType *character = newTcType_Character();
int save = PROTECT(character);
TcType *res = makeListType(character);
UNPROTECT(save);
return res;
}
TcType *makeBasicType(void) {
TcUserType *userType = newTcUserType(newSymbol("basic_type"), NULL, -1);
int save = PROTECT(userType);
PROTECT(userType);
TcType *res = newTcType_UserType(userType);
UNPROTECT(save);
return res;
}
TcType *makeIOType(void) {
TcUserType *userType = newTcUserType(newSymbol("io_mode"), NULL, -1);
int save = PROTECT(userType);
PROTECT(userType);
TcType *res = newTcType_UserType(userType);
UNPROTECT(save);
return res;
}
TcType *makeFTypeType(void) {
TcUserType *userType = newTcUserType(newSymbol("ftype_type"), NULL, -1);
int save = PROTECT(userType);
PROTECT(userType);
TcType *res = newTcType_UserType(userType);
UNPROTECT(save);
return res;
}
static TcType *analyzeExp(LamExp *exp, TcEnv *env, TcNg *ng) {
if (exp == NULL)
return NULL;
switch (exp->type) {
case LAMEXP_TYPE_LAM:
return prune(analyzeLam(exp->val.lam, env, ng));
case LAMEXP_TYPE_VAR:
return prune(analyzeVar(CPI(exp), exp->val.var, env, ng));
case LAMEXP_TYPE_STDINT:
return prune(analyzeSmallInteger());
case LAMEXP_TYPE_BIGINTEGER:
return prune(analyzeBigInteger());
case LAMEXP_TYPE_PRIM:
return prune(analyzePrim(exp->val.prim, env, ng));
case LAMEXP_TYPE_SEQUENCE:
return prune(analyzeSequence(exp->val.sequence, env, ng));
case LAMEXP_TYPE_MAKEVEC:
cant_happen("encountered make-vec in analyzeExp");
case LAMEXP_TYPE_CONSTRUCT:
return prune(analyzeConstruct(exp->val.construct, env, ng));
case LAMEXP_TYPE_DECONSTRUCT:
return prune(analyzeDeconstruct(exp->val.deconstruct, env, ng));
case LAMEXP_TYPE_TAG:
return prune(analyzeTag(exp->val.tag, env, ng));
case LAMEXP_TYPE_CONSTANT:
return prune(analyzeConstant(exp->val.constant, env, ng));
case LAMEXP_TYPE_APPLY:
return prune(analyzeApply(exp->val.apply, env, ng));
case LAMEXP_TYPE_IFF:
return prune(analyzeIff(exp->val.iff, env, ng));
case LAMEXP_TYPE_CALLCC:
return prune(analyzeCallCC(exp->val.callcc, env, ng));
case LAMEXP_TYPE_PRINT:
return prune(analyzePrint(exp->val.print, env, ng));
case LAMEXP_TYPE_LETREC:
return prune(analyzeLetRec(exp->val.letrec, env, ng));
case LAMEXP_TYPE_TYPEDEFS:
return prune(analyzeTypeDefs(exp->val.typedefs, env, ng));
case LAMEXP_TYPE_LET:
return prune(analyzeLet(exp->val.let, env, ng));
case LAMEXP_TYPE_MATCH:
return prune(analyzeMatch(exp->val.match, env, ng));
case LAMEXP_TYPE_COND:
return prune(analyzeCond(exp->val.cond, env, ng));
case LAMEXP_TYPE_AMB:
return prune(analyzeAmb(exp->val.amb, env, ng));
case LAMEXP_TYPE_CHARACTER:
return prune(analyzeCharacter());
case LAMEXP_TYPE_BACK:
return prune(analyzeBack());
case LAMEXP_TYPE_ERROR:
return prune(analyzeError());
case LAMEXP_TYPE_TUPLE_INDEX:
return prune(analyzeTupleIndex(exp->val.tuple_index, env, ng));
case LAMEXP_TYPE_MAKE_TUPLE:
return prune(analyzeMakeTuple(exp->val.make_tuple, env, ng));
case LAMEXP_TYPE_NAMESPACES:
return prune(analyzeNamespaces(exp->val.namespaces, env, ng));
case LAMEXP_TYPE_ENV:
return prune(analyzeEnv(env));
case LAMEXP_TYPE_LOOKUP:
return prune(analyzeLookup(exp->val.lookup, env, ng));
case LAMEXP_TYPE_CONSTRUCTOR:
return prune(analyzeVar(CPI(exp), exp->val.constructor->name, env, ng));
case LAMEXP_TYPE_COND_DEFAULT:
cant_happen("encountered cond default in analyzeExp");
default:
cant_happen("unrecognized type %s", lamExpTypeName(exp->type));
}
}
static TcType *makeFunctionType(LamVarList *args, TcEnv *env,
TcType *returnType) {
// ENTER(makeFunctionType);
if (args == NULL) {
// LEAVE(makeFunctionType);
return returnType;
}
TcType *next = makeFunctionType(args->next, env, returnType);
int save = PROTECT(next);
TcType *this = NULL;
if (!getFromTcEnv(env, args->var, &this)) {
cant_happen("cannot find var in env in makeFunctionType");
}
TcType *ret = makeFn(this, next);
UNPROTECT(save);
// LEAVE(makeFunctionType);
return ret;
}
static TcType *analyzeLam(LamLam *lam, TcEnv *env, TcNg *ng) {
// ENTER(analyzeLam);
env = newTcEnv(env);
int save = PROTECT(env);
ng = newTcNg(ng);
PROTECT(ng);
for (LamVarList *args = lam->args; args != NULL; args = args->next) {
TcType *freshType = makeFreshVar(args->var->name);
int save2 = PROTECT(freshType);
addToEnv(env, args->var, freshType);
addToNg(ng, freshType);
UNPROTECT(save2);
}
TcType *returnType = analyzeExp(lam->exp, env, ng);
PROTECT(returnType);
TcType *functionType = makeFunctionType(lam->args, env, returnType);
UNPROTECT(save);
// LEAVE(analyzeLam);
return functionType;
}
static TcType *analyzeVar(ParserInfo I, HashSymbol *var, TcEnv *env, TcNg *ng) {
// ENTER(analyzeVar);
TcType *res = lookup(env, var, ng);
if (res == NULL) {
// ppTcEnv(env);
cant_happen("undefined variable %s in %s, line %d", var->name, I.filename, I.lineno);
return makeUnknown(var);
}
// LEAVE(analyzeVar);
return res;
}
static TcType *analyzeSmallInteger() {
return makeSmallInteger();
}
static TcType *analyzeBigInteger() {
// ENTER(analyzeBigInteger);
TcType *res = makeBigInteger();
// LEAVE(analyzeBigInteger);
return res;
}
static TcType *analyzeBinaryArith(LamExp *exp1, LamExp *exp2, TcEnv *env,
TcNg *ng) {
// ENTER(analyzeBinaryArith);
(void) analyzeBigIntegerExp(exp1, env, ng);
TcType *res = analyzeBigIntegerExp(exp2, env, ng);
// LEAVE(analyzeBinaryArith);
return res;
}
static TcType *analyzeComparison(LamExp *exp1, LamExp *exp2, TcEnv *env,
TcNg *ng) {
// ENTER(analyzeComparison);
TcType *type1 = analyzeExp(exp1, env, ng);
int save = PROTECT(type1);
TcType *type2 = analyzeExp(exp2, env, ng);
PROTECT(type2);
if (!unify(type1, type2, "comparison")) {
eprintf("while unifying comparison:\n");
ppLamExp(exp1);
eprintf("\nwith\n");
ppLamExp(exp2);
eprintf("\n");
REPORT_PARSER_INFO(exp1);
if (!EQ_PARSER_INFO(exp1, exp2)) {
REPORT_PARSER_INFO(exp2);
}
}
UNPROTECT(save);
TcType *res = makeBoolean();
// LEAVE(analyzeComparison);
return res;
}
static TcType *analyzeSpaceship(LamExp *exp1, LamExp *exp2, TcEnv *env,
TcNg *ng) {
// ENTER(analyzeComparison);
TcType *type1 = analyzeExp(exp1, env, ng);
int save = PROTECT(type1);
TcType *type2 = analyzeExp(exp2, env, ng);
PROTECT(type2);
if (!unify(type1, type2, "<=>")) {
eprintf("while unifying <=>:\n");
ppLamExp(exp1);
eprintf("\nwith\n");
ppLamExp(exp1);
eprintf("\n");
REPORT_PARSER_INFO(exp1);
if (!EQ_PARSER_INFO(exp1, exp2)) {
REPORT_PARSER_INFO(exp2);
}
}
UNPROTECT(save);
TcType *res = makeSpaceship();
// LEAVE(analyzeComparison);
return res;
}
static TcType *analyzePrim(LamPrimApp *app, TcEnv *env, TcNg *ng) {
// ENTER(analyzePrim);
TcType *res = NULL;
switch (app->type) {
case LAMPRIMOP_TYPE_ADD:
case LAMPRIMOP_TYPE_SUB:
case LAMPRIMOP_TYPE_MUL:
case LAMPRIMOP_TYPE_DIV:
case LAMPRIMOP_TYPE_MOD:
case LAMPRIMOP_TYPE_POW:
res = analyzeBinaryArith(app->exp1, app->exp2, env, ng);
break;
case LAMPRIMOP_TYPE_EQ:
case LAMPRIMOP_TYPE_NE:
case LAMPRIMOP_TYPE_GT:
case LAMPRIMOP_TYPE_LT:
case LAMPRIMOP_TYPE_GE:
case LAMPRIMOP_TYPE_LE:
res = analyzeComparison(app->exp1, app->exp2, env, ng);
break;
case LAMPRIMOP_TYPE_CMP:
res = analyzeSpaceship(app->exp1, app->exp2, env, ng);
break;
case LAMPRIMOP_TYPE_VEC:
cant_happen("encountered VEC in analyzePrim");
break;
default:
cant_happen("unrecognised type %d in analyzePrim", app->type);
}
// LEAVE(analyzePrim);
return res;
}
static TcType *analyzeSequence(LamSequence *sequence, TcEnv *env, TcNg *ng) {
// ENTER(analyzeSequence);
if (sequence == NULL) {
cant_happen("NULL sequence in analyzeSequence");
}
TcType *type = analyzeExp(sequence->exp, env, ng);
if (sequence->next != NULL) {
TcType *res = analyzeSequence(sequence->next, env, ng);
// LEAVE(analyzeSequence);
return res;
}
// LEAVE(analyzeSequence);
return type;
}
static LamApply *constructToApply(LamConstruct *construct) {
// ENTER(constructToApply);
LamExp *constructor =
newLamExp_Var(CPI(construct), construct->name);
int save = PROTECT(constructor);
LamApply *apply = newLamApply(CPI(construct), constructor, construct->args);
UNPROTECT(save);
// LEAVE(constructToApply);
return apply;
}
static TcType *analyzeConstruct(LamConstruct *construct, TcEnv *env, TcNg *ng) {
// ENTER(analyzeConstruct);
LamApply *apply = constructToApply(construct);
int save = PROTECT(apply);
TcType *res = analyzeApply(apply, env, ng);
UNPROTECT(save);
// LEAVE(analyzeConstruct);
return res;
}
static TcType *findNthArg(int n, TcType *fn) {
if (fn == NULL) {
cant_happen("findNthArg hit NULL");
}
if (fn->type != TCTYPE_TYPE_FUNCTION) {
cant_happen("findNthArg given non-function type %s", tcTypeTypeName(fn->type));
}
if (n == 0) {
return fn->val.function->arg;
}
TcType *res = findNthArg(n - 1, fn->val.function->result);
return res;
}
static TcType *findResultType(TcType *fn) {
if (fn == NULL) {
cant_happen("findResultType hit NULL");
}
if (fn->type != TCTYPE_TYPE_FUNCTION) {
return fn;
}
TcType *res = findResultType(fn->val.function->result);
return res;
}
static TcType *analyzeDeconstruct(LamDeconstruct *deconstruct, TcEnv *env,
TcNg *ng) {
// ENTER(analyzeDeconstruct);
// eprintf("analyze deconstruct %s\n", deconstruct->name->name);
// ppTcEnv(env);
TcType *constructor = lookupConstructorType(deconstruct->name, deconstruct->nsid, env, ng);
int save = PROTECT(constructor);
// ppTcType(constructor); eprintf("\n");
if (constructor == NULL) {
can_happen("undefined type deconstructor %s",
deconstruct->name->name);
REPORT_PARSER_INFO(deconstruct);
TcType *res = makeFreshVar(deconstruct->name->name);
// LEAVE(analyzeDeconstruct);
return res;
}
TcType *fieldType = findNthArg(deconstruct->vec - 1, constructor);
TcType *resultType = findResultType(constructor);
TcType *expType = analyzeExp(deconstruct->exp, env, ng);
PROTECT(expType);
if (!unify(expType, resultType, "deconstruct")) {
eprintf("while unifying deconstruct:\n");
REPORT_PARSER_INFO(deconstruct);
ppLamDeconstruct(deconstruct);
eprintf("\n");
}
UNPROTECT(save);
// LEAVE(analyzeDeconstruct);
return fieldType;
}
static TcType *analyzeTupleIndex(LamTupleIndex *index, TcEnv *env, TcNg *ng) {
TcType *tuple = analyzeExp(index->exp, env, ng);
int save = PROTECT(tuple);
TcType *template = makeTuple(index->size);
PROTECT(template);
if (!unify(tuple, template, "tuple index")) {
eprintf("while analyzing tuple ");
REPORT_PARSER_INFO(index->exp);
ppTcType(tuple);
HashSymbol *name = newSymbol("tuple");
UNPROTECT(save);
return makeUnknown(name);
}
UNPROTECT(save);
return template->val.tuple->entries[index->vec];
}
static TcType *analyzeMakeTuple(LamArgs *tuple, TcEnv *env, TcNg *ng) {
TcTypeArray *values = newTcTypeArray();
int save = PROTECT(values);
while (tuple != NULL) {
TcType *part = analyzeExp(tuple->exp, env, ng);
int save2 = PROTECT(part);
pushTcTypeArray(values, part);
UNPROTECT(save2);
tuple = tuple->next;
}
TcType *res = newTcType_Tuple(values);
UNPROTECT(save);
return res;
}
TcType *lookupNsRef(int index, TcEnv *env) {
#ifdef SAFETY_CHECKS
if (index == NS_GLOBAL) {
cant_happen("lookupNsRef passed global namespace");
}
#endif
Index i = index;
TcType *nsType = NULL;
if (!getFromTcEnv(env, namespacesSymbol(), &nsType)) {
cant_happen("failed to retrieve namespaces");
}
#ifdef SAFETY_CHECKS
if (nsType->type != TCTYPE_TYPE_NAMESPACES) {
cant_happen("expected namespaces");
}
if (i >= nsType->val.namespaces->size) {
cant_happen("index out of range");
}
#endif
return nsType->val.namespaces->entries[i];
}
static TcType *analyzeLookup(LamLookup *lookup, TcEnv *env, TcNg *ng) {
TcType *nsType = lookupNsRef(lookup->nsid, env);
return analyzeExp(lookup->exp, nsType->val.env, ng);
}
static TcType *analyzeNamespaces(LamNamespaceArray *nsArray, TcEnv *env, TcNg *ng) {
TcType *nsType = NULL;
if (!getFromTcEnv(env, namespacesSymbol(), &nsType)) {
cant_happen("failed to retrieve namespaces");
}
for (Index i = 0; i < nsArray->size; i++) {
TcEnv *env2 = newTcEnv(env);
int save = PROTECT(env2);
TcNg *ng2 = newTcNg(ng);
PROTECT(ng2);
TcType *nsId = newTcType_Nsid((int) i);
PROTECT(nsId);
addToEnv(env2, namespaceSymbol(), nsId);
TcType *res = analyzeExp(nsArray->entries[i], env2, ng2);
PROTECT(res);
pushTcNamespaceArray(nsType->val.namespaces, res);
UNPROTECT(save);
}
return nsType;
}
static TcType *analyzeEnv(TcEnv *env) {
return newTcType_Env(env);
}
static TcType *analyzeTag(LamExp *tagged, TcEnv *env, TcNg *ng) {
return analyzeExp(tagged, env, ng);
}
static TcType *analyzeConstant(LamConstant *constant, TcEnv *env, TcNg *ng) {
// ENTER(analyzeConstant);
TcType *constType = lookup(env, constant->name, ng);
if (constType == NULL) {
can_happen("undefined constant %s", constant->name->name);
TcType *res = makeFreshVar("err");
// LEAVE(analyzeConstant);
return res;
}
// LEAVE(analyzeConstant);
return constType;
}
// apply(fn) => fn
// apply(fn, arg_1, arg_2, arg_3) => apply(apply(apply(fn, arg1), arg_2), arg_3)
static LamApply *curryLamApplyHelper(int nargs, LamExp *function,
LamArgs *args) {
if (nargs == 1) {
LamApply *res = newLamApply(CPI(function), function, args);
return res;
}
LamArgs *singleArg = newLamArgs(CPI(args), args->exp, NULL);
int save = PROTECT(singleArg);
LamApply *new = newLamApply(CPI(function), function, singleArg);
PROTECT(new);
LamExp *newFunction = newLamExp_Apply(CPI(new), new);
PROTECT(newFunction);
LamApply *curried =
curryLamApplyHelper(nargs - 1, newFunction, args->next);
UNPROTECT(save);
return curried;
}
static LamApply *curryLamApply(LamApply *apply) {
return curryLamApplyHelper(countLamArgs(apply->args), apply->function, apply->args);
}
static TcType *analyzeApply(LamApply *apply, TcEnv *env, TcNg *ng) {
// ENTER(analyzeApply);
switch (countLamArgs(apply->args)) {
case 0:{
TcType *res = analyzeExp(apply->function, env, ng);
// LEAVE(analyzeApply);
return res;
}
case 1:{
// fn :: #a -> #b
TcType *fn = analyzeExp(apply->function, env, ng);
int save = PROTECT(fn);
// arg :: #c
TcType *arg = analyzeExp(apply->args->exp, env, ng);
PROTECT(arg);
// res :: #d
TcType *res = makeFreshVar("apply");
PROTECT(res);
// functionType :: #c -> #d
TcType *functionType = makeFn(arg, res);
PROTECT(functionType);
// unify(#a -> #b, #c -> #d)
if (!unify(fn, functionType, "apply")) {
eprintf("while analyzing apply ");
ppLamExp(apply->function);
eprintf(" to ");
ppLamExp(apply->args->exp);
eprintf("\n");
REPORT_PARSER_INFO(apply->function);
if (!EQ_PARSER_INFO(apply->function, apply->args)) {
REPORT_PARSER_INFO(apply->args);
}
}
UNPROTECT(save);
// LEAVE(analyzeApply);
res = prune(res);
// #d/#b
return res;
}
default:{
LamApply *curried = curryLamApply(apply);
int save = PROTECT(curried);
TcType *res = analyzeApply(curried, env, ng);
UNPROTECT(save);
// LEAVE(analyzeApply);
return res;
}
}
}
static TcType *analyzeIff(LamIff *iff, TcEnv *env, TcNg *ng) {
// ENTER(analyzeIff);
(void) analyzeBooleanExp(iff->condition, env, ng);
TcType *consequent = analyzeExp(iff->consequent, env, ng);
int save = PROTECT(consequent);
TcType *alternative = analyzeExp(iff->alternative, env, ng);
PROTECT(alternative);
if (!unify(consequent, alternative, "iff")) {
eprintf("while unifying consequent:\n");
ppLamExp(iff->consequent);
eprintf("\nwith alternative:\n");
ppLamExp(iff->alternative);
eprintf("\n");
REPORT_PARSER_INFO(iff->consequent);
if (!EQ_PARSER_INFO(iff->consequent, iff->alternative)) {
REPORT_PARSER_INFO(iff->alternative);
}
}
UNPROTECT(save);
// LEAVE(analyzeIff);
return consequent;
}
static TcType *analyzeCallCC(LamExp *called, TcEnv *env, TcNg *ng) {
// 'call/cc' is ((a -> b) -> a) -> a
TcType *a = makeFreshVar("callccA");
int save = PROTECT(a);
TcType *b = makeFreshVar("callccB");
PROTECT(b);
TcType *ab = makeFn(a, b);
PROTECT(ab);
TcType *aba = makeFn(ab, a);
PROTECT(aba);
TcType *calledType = analyzeExp(called, env, ng);
PROTECT(calledType);
if (!unify(calledType, aba, "call/cc")) {
eprintf("while unifying call/cc:\n");
ppLamExp(called);
eprintf("\n");
REPORT_PARSER_INFO(called);
}
UNPROTECT(save);
return a;
}
static TcType *analyzePrint(LamPrint *print, TcEnv *env, TcNg *ng) {
// a -> a, but installs a printer for type a
// ENTER(analyzePrint);
TcType *type = analyzeExp(print->exp, env, ng);
int save = PROTECT(type);
print->printer = compilePrinterForType(CPI(print), type, env);
UNPROTECT(save);
// LEAVE(analyzePrint);
IFDEBUG(ppTcType(type));
return type;
}
static bool isLambdaBinding(LamLetRecBindings *bindings) {
return bindings->val->type == LAMEXP_TYPE_LAM;
}
static void prepareLetRecEnv(LamLetRecBindings *bindings, TcEnv *env) {
TcType *freshType = makeFreshVar(bindings->var->name);
int save = PROTECT(freshType);
addToEnv(env, bindings->var, freshType);
UNPROTECT(save);
}
static void processLetRecBinding(LamLetRecBindings *bindings, TcEnv *env,
TcNg *ng) {
TcType *existingType = NULL;
if (!getFromTcEnv(env, bindings->var, &existingType)) {
cant_happen("failed to retrieve fresh var from env in analyzeLetRec");
}
int save = PROTECT(existingType);
// Recursive functions need to be statically typed inside their own context:
TcNg *ng2 = newTcNg(ng);
PROTECT(ng2);
addToNg(ng2, existingType);
TcType *type = analyzeExp(bindings->val, env, ng2);
PROTECT(type);
if (!unify(existingType, type, "letrec")) {
eprintf("while unifying letrec %s with ", bindings->var->name);
ppLamExp(bindings->val);
eprintf("\nExisting Type: ");
ppTcType(existingType);
eprintf("\nNew Type: ");
ppTcType(type);
eprintf("\n");
REPORT_PARSER_INFO(bindings->val);
}
DEBUGN("analyzeLetRec %s :: ", bindings->var->name);
IFDEBUGN(ppTcType(existingType));
UNPROTECT(save);
}
static TcType *analyzeLetRec(LamLetRec *letRec, TcEnv *env, TcNg *ng) {
// ENTER(analyzeLetRec);
env = newTcEnv(env);
int save = PROTECT(env);
ng = newTcNg(ng);
PROTECT(ng);
// bind lambdas early
for (LamLetRecBindings *bindings = letRec->bindings; bindings != NULL;
bindings = bindings->next) {
if (isLambdaBinding(bindings)) {
prepareLetRecEnv(bindings, env);
}
}
for (LamLetRecBindings *bindings = letRec->bindings; bindings != NULL;
bindings = bindings->next) {
DEBUGN("analyzeLetRec %s => ", bindings->var->name);
IFDEBUGN(ppLamExp(bindings->val));
if (!isLambdaBinding(bindings)) {
prepareLetRecEnv(bindings, env);
}
processLetRecBinding(bindings, env, ng);
}
// HACK! second pass through fixes up forward references
if (!hadErrors()) {
for (LamLetRecBindings *bindings = letRec->bindings; bindings != NULL;
bindings = bindings->next) {
if (isLambdaBinding(bindings)) {
processLetRecBinding(bindings, env, ng);
}
}
}
// HACK! third pass through fixes up even more forward references
if (!hadErrors()) {
for (LamLetRecBindings *bindings = letRec->bindings; bindings != NULL;
bindings = bindings->next) {
if (isLambdaBinding(bindings)) {
processLetRecBinding(bindings, env, ng);
}
}
}
TcType *res = analyzeExp(letRec->body, env, ng);
UNPROTECT(save);
// LEAVE(analyzeLetRec);
return res;
}
static TcUserTypeArgs *makeTcUserTypeArgs(LamTypeArgs *lamTypeArgs,
TcTypeTable *map) {
if (lamTypeArgs == NULL) {
return NULL;
}
TcUserTypeArgs *next = makeTcUserTypeArgs(lamTypeArgs->next, map);
int save = PROTECT(next);
TcType *name = NULL;
if (!getTcTypeTable(map, lamTypeArgs->name, &name)) {
name = makeVar(lamTypeArgs->name);
int save2 = PROTECT(name);
setTcTypeTable(map, lamTypeArgs->name, name);
UNPROTECT(save2);
}
TcUserTypeArgs *this = newTcUserTypeArgs(name, next);
UNPROTECT(save);
return this;
}
TcType *makeUserType(HashSymbol *name, TcUserTypeArgs *args, int nsid) {
if (strcmp(name->name, "list") == 0 && nsid != -1) {
cant_happen("list in ns %d", nsid);
}
TcUserType *tcUserType = newTcUserType(name, args, nsid);
int save = PROTECT(tcUserType);
TcType *res =
newTcType_UserType(tcUserType);
UNPROTECT(save);
return res;
}
static TcType *makeTcUserType(LamType *lamType, TcTypeTable *map, int nsid) {
TcUserTypeArgs *args = makeTcUserTypeArgs(lamType->args, map);
int save = PROTECT(args);
TcType *res = makeUserType(lamType->name, args, nsid);
UNPROTECT(save);
return res;
}
static TcType *makeTuple(int size) {
TcTypeArray *array = newTcTypeArray();
int save = PROTECT(array);
while (size-- > 0) {
TcType *part = makeFreshVar("tuple");
int save2 = PROTECT(part);
pushTcTypeArray(array, part);
UNPROTECT(save2);
}
TcType *res = newTcType_Tuple(array);
UNPROTECT(save);
return res;
}
static TcType *makeTypeConstructorArg(LamTypeConstructorType *arg,
TcTypeTable *map, TcEnv *env);
static TcTypeArray *makeTupleArray(LamTypeConstructorArgs *args, TcTypeTable *map, TcEnv *env) {
TcTypeArray *array = newTcTypeArray();
int save = PROTECT(array);
while (args != NULL) {
TcType *arg = makeTypeConstructorArg(args->arg, map, env);
int save2 = PROTECT(arg);
pushTcTypeArray(array, arg);
UNPROTECT(save2);
args = args->next;
}
UNPROTECT(save);
return array;
}
static TcUserTypeArgs *makeUserTypeArgs(LamTypeConstructorArgs *args,
TcTypeTable *map, TcEnv *env) {
if (args == NULL) {
return NULL;
}
TcUserTypeArgs *next = makeUserTypeArgs(args->next, map, env);
int save = PROTECT(next);
TcType *arg = makeTypeConstructorArg(args->arg, map, env);
PROTECT(arg);
TcUserTypeArgs *this = newTcUserTypeArgs(arg, next);
UNPROTECT(save);
return this;
}
static int findNamespace(LamLookupOrSymbol *los, TcEnv *env) {
switch (los->type) {
case LAMLOOKUPORSYMBOL_TYPE_LOOKUP:
return los->val.lookup->nsid;
case LAMLOOKUPORSYMBOL_TYPE_SYMBOL:{
// eprintf("looking for %s in ", los->val.symbol->name);
// ppTcEnv(env);
TcUserType *userType;
if (getUserTypeFromTcEnv(env, los->val.symbol, &userType)) {
return userType->ns;
}
TcType *ns = NULL;
getFromTcEnv(env, namespaceSymbol(), &ns);
#ifdef SAFETY_CHECKS
if (ns == NULL) {
cant_happen("cannot locate current namespace");
}
#endif
return ns->val.nsid;
}
default:
cant_happen("unrecognized %s", lamLookupOrSymbolTypeName(los->type));
}
}
static HashSymbol *getUnderlyingFunction(LamLookupOrSymbol *los) {
switch (los->type) {
case LAMLOOKUPORSYMBOL_TYPE_LOOKUP:
return los->val.lookup->symbol;
case LAMLOOKUPORSYMBOL_TYPE_SYMBOL:
return los->val.symbol;
default:
cant_happen("unrecognized %s", lamLookupOrSymbolTypeName(los->type));
}
}
static TcType *makeTypeConstructorApplication(LamTypeFunction *func,
TcTypeTable *map,
TcEnv *env) {
// this code is building the inner application of a type, i.e.
// list(t) in the context of t -> list(t) -> list(t)
TcUserTypeArgs *args = makeUserTypeArgs(func->args, map, env);
int save = PROTECT(args);
int ns = findNamespace(func->name, env);
TcType *res = makeUserType(getUnderlyingFunction(func->name), args, ns);
UNPROTECT(save);
return res;
}
static TcType *makeTupleApplication(LamTypeConstructorArgs *tuple, TcTypeTable *map, TcEnv *env) {
TcTypeArray *array = makeTupleArray(tuple, map, env);
int save = PROTECT(array);
TcType *res = newTcType_Tuple(array);
UNPROTECT(save);
return res;
}
static TcType *makeTypeConstructorArg(LamTypeConstructorType *arg,
TcTypeTable *map, TcEnv *env) {
TcType *res = NULL;
switch (arg->type) {
case LAMTYPECONSTRUCTORTYPE_TYPE_INTEGER:
res = makeBigInteger();
break;
case LAMTYPECONSTRUCTORTYPE_TYPE_CHARACTER:
res = makeCharacter();
break;