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// This file defines how to compile assignments
#include "../ast.h"
#include "../environment.h"
#include "../stdlib/datatypes.h"
#include "../stdlib/text.h"
#include "../stdlib/util.h"
#include "../typecheck.h"
#include "compilation.h"
public
Text_t compile_update_assignment(env_t *env, ast_t *ast) {
if (!is_update_assignment(ast)) code_err(ast, "This is not an update assignment");
binary_operands_t update = UPDATE_OPERANDS(ast);
type_t *lhs_t = get_type(env, update.lhs);
bool needs_idemotency_fix = !is_idempotent(update.lhs);
Text_t lhs = needs_idemotency_fix ? Text("(*lhs)") : compile_lvalue(env, update.lhs);
Text_t update_assignment = EMPTY_TEXT;
switch (ast->tag) {
case PlusUpdate: {
if (lhs_t->tag == IntType || lhs_t->tag == NumType || lhs_t->tag == ByteType)
update_assignment = Texts(lhs, " += ", compile_to_type(env, update.rhs, lhs_t), ";");
break;
}
case MinusUpdate: {
if (lhs_t->tag == IntType || lhs_t->tag == NumType || lhs_t->tag == ByteType)
update_assignment = Texts(lhs, " -= ", compile_to_type(env, update.rhs, lhs_t), ";");
break;
}
case MultiplyUpdate: {
if (lhs_t->tag == IntType || lhs_t->tag == NumType || lhs_t->tag == ByteType)
update_assignment = Texts(lhs, " *= ", compile_to_type(env, update.rhs, lhs_t), ";");
break;
}
case DivideUpdate: {
if (lhs_t->tag == IntType || lhs_t->tag == NumType || lhs_t->tag == ByteType)
update_assignment = Texts(lhs, " /= ", compile_to_type(env, update.rhs, lhs_t), ";");
break;
}
case LeftShiftUpdate: {
if (lhs_t->tag == IntType || lhs_t->tag == ByteType)
update_assignment = Texts(lhs, " <<= ", compile_to_type(env, update.rhs, lhs_t), ";");
break;
}
case RightShiftUpdate: {
if (lhs_t->tag == IntType || lhs_t->tag == ByteType)
update_assignment = Texts(lhs, " >>= ", compile_to_type(env, update.rhs, lhs_t), ";");
break;
}
case AndUpdate: {
if (lhs_t->tag == BoolType)
update_assignment =
Texts("if (", lhs, ") ", lhs, " = ", compile_to_type(env, update.rhs, Type(BoolType)), ";");
break;
}
case OrUpdate: {
if (lhs_t->tag == BoolType)
update_assignment =
Texts("if (!", lhs, ") ", lhs, " = ", compile_to_type(env, update.rhs, Type(BoolType)), ";");
break;
}
default: break;
}
if (update_assignment.length == 0) {
ast_t *binop = new (ast_t);
*binop = *ast;
binop->tag = binop_tag(binop->tag);
if (needs_idemotency_fix) binop->__data.Plus.lhs = LiteralCode(Text("*lhs"), .type = lhs_t);
update_assignment = Texts(lhs, " = ", compile_to_type(env, binop, lhs_t), ";");
}
if (needs_idemotency_fix)
return Texts("{ ", compile_declaration(Type(PointerType, .pointed = lhs_t), Text("lhs")), " = &",
compile_lvalue(env, update.lhs), "; ", update_assignment, "; }");
else return update_assignment;
}
public
Text_t compile_assignment(env_t *env, ast_t *target, Text_t value) {
return Texts(compile_lvalue(env, target), " = ", value);
}
public
Text_t compile_assignment_statement(env_t *env, ast_t *ast) {
DeclareMatch(assign, ast, Assign);
// Single assignment, no temp vars needed:
if (assign->targets && !assign->targets->next) {
type_t *lhs_t = get_type(env, assign->targets->ast);
if (assign->targets->ast->tag == Index && lhs_t->tag == OptionalType
&& value_type(get_type(env, Match(assign->targets->ast, Index)->indexed))->tag == TableType)
lhs_t = Match(lhs_t, OptionalType)->type;
if (has_stack_memory(lhs_t))
code_err(ast, "Stack references cannot be assigned to "
"variables because the "
"variable's scope may outlive the scope of the "
"stack memory.");
env_t *val_env = with_enum_scope(env, lhs_t);
Text_t val = compile_to_type(val_env, assign->values->ast, lhs_t);
return Texts(compile_assignment(env, assign->targets->ast, val), ";\n");
}
Text_t code = Text("{ // Assignment\n");
int64_t i = 1;
for (ast_list_t *value = assign->values, *target = assign->targets; value && target;
value = value->next, target = target->next) {
type_t *lhs_t = get_type(env, target->ast);
if (target->ast->tag == Index && lhs_t->tag == OptionalType
&& value_type(get_type(env, Match(target->ast, Index)->indexed))->tag == TableType)
lhs_t = Match(lhs_t, OptionalType)->type;
if (has_stack_memory(lhs_t))
code_err(ast, "Stack references cannot be assigned to "
"variables because the "
"variable's scope may outlive the scope of the "
"stack memory.");
env_t *val_env = with_enum_scope(env, lhs_t);
Text_t val = compile_to_type(val_env, value->ast, lhs_t);
code = Texts(code, compile_type(lhs_t), " $", i, " = ", val, ";\n");
i += 1;
}
i = 1;
for (ast_list_t *target = assign->targets; target; target = target->next) {
code = Texts(code, compile_assignment(env, target->ast, Texts("$", i)), ";\n");
i += 1;
}
return Texts(code, "\n}");
}
public
Text_t compile_lvalue(env_t *env, ast_t *ast) {
if (!can_be_mutated(env, ast)) {
if (ast->tag == Index) {
ast_t *subject = Match(ast, Index)->indexed;
code_err(subject, "This is an immutable value, you can't mutate "
"its contents");
} else if (ast->tag == FieldAccess) {
ast_t *subject = Match(ast, FieldAccess)->fielded;
type_t *t = get_type(env, subject);
code_err(subject, "This is an immutable ", type_to_str(t), " value, you can't assign to its fields");
} else {
code_err(ast, "This is a value of type ", type_to_str(get_type(env, ast)),
" and can't be used as an assignment target");
}
}
if (ast->tag == Index) {
DeclareMatch(index, ast, Index);
type_t *container_t = get_type(env, index->indexed);
if (container_t->tag == OptionalType)
code_err(index->indexed, "This value might be none, so it can't be "
"safely used as an assignment target");
if (!index->index && container_t->tag == PointerType) return compile(env, ast);
container_t = value_type(container_t);
type_t *index_t = get_type(env, index->index);
if (container_t->tag == ListType) {
Text_t target_code = compile_to_pointer_depth(env, index->indexed, 1, false);
type_t *item_type = Match(container_t, ListType)->item_type;
Text_t index_code =
index->index->tag == Int
? compile_int_to_type(env, index->index, Type(IntType, .bits = TYPE_IBITS64))
: (index_t->tag == BigIntType ? Texts("Int64$from_int(", compile(env, index->index), ", no)")
: Texts("(Int64_t)(", compile(env, index->index), ")"));
if (index->unchecked) {
return Texts("List_lvalue_unchecked(", compile_type(item_type), ", ", target_code, ", ", index_code,
")");
} else {
return Texts("List_lvalue(", compile_type(item_type), ", ", target_code, ", ", index_code, ", ",
(int64_t)(ast->start - ast->file->text), ", ", (int64_t)(ast->end - ast->file->text), ")");
}
} else if (container_t->tag == TableType) {
DeclareMatch(table_type, container_t, TableType);
if (table_type->default_value) {
type_t *value_type = get_type(env, table_type->default_value);
return Texts("*Table$get_or_setdefault(", compile_to_pointer_depth(env, index->indexed, 1, false), ", ",
compile_type(table_type->key_type), ", ", compile_type(value_type), ", ",
compile_to_type(env, index->index, table_type->key_type), ", ",
compile_to_type(env, table_type->default_value, table_type->value_type), ", ",
compile_type_info(container_t), ")");
}
if (index->unchecked) code_err(ast, "Table indexes cannot be unchecked");
return Texts("*(", compile_type(Type(PointerType, table_type->value_type)), ")Table$reserve(",
compile_to_pointer_depth(env, index->indexed, 1, false), ", ",
compile_to_type(env, index->index, Type(PointerType, table_type->key_type, .is_stack = true)),
", NULL,", compile_type_info(container_t), ")");
} else {
code_err(ast, "I don't know how to assign to this target");
}
} else if (ast->tag == Var || ast->tag == FieldAccess || ast->tag == InlineCCode) {
return compile(env, ast);
} else {
code_err(ast, "I don't know how to assign to this");
}
return EMPTY_TEXT;
}
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