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Copy pathcheck_stmt.cpp
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2734 lines (2367 loc) · 75.5 KB
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gb_internal bool is_diverging_expr(Ast *expr) {
expr = unparen_expr(expr);
if (expr->kind != Ast_CallExpr) {
return false;
}
if (expr->CallExpr.proc->kind == Ast_BasicDirective) {
String name = expr->CallExpr.proc->BasicDirective.name.string;
return name == "panic";
}
Ast *proc = unparen_expr(expr->CallExpr.proc);
TypeAndValue tv = proc->tav;
if (tv.mode == Addressing_Builtin) {
Entity *e = entity_of_node(proc);
BuiltinProcId id = BuiltinProc_Invalid;
if (e != nullptr) {
id = cast(BuiltinProcId)e->Builtin.id;
} else {
id = BuiltinProc_DIRECTIVE;
}
return builtin_procs[id].diverging;
}
Type *t = tv.type;
t = base_type(t);
return t != nullptr && t->kind == Type_Proc && t->Proc.diverging;
}
gb_internal bool is_diverging_stmt(Ast *stmt) {
if (stmt->kind != Ast_ExprStmt) {
return false;
}
return is_diverging_expr(stmt->ExprStmt.expr);
}
gb_internal bool contains_deferred_call(Ast *node) {
if (node->viral_state_flags & ViralStateFlag_ContainsDeferredProcedure) {
return true;
}
switch (node->kind) {
case Ast_ExprStmt:
return contains_deferred_call(node->ExprStmt.expr);
case Ast_AssignStmt:
for_array(i, node->AssignStmt.rhs) {
if (contains_deferred_call(node->AssignStmt.rhs[i])) {
return true;
}
}
for_array(i, node->AssignStmt.lhs) {
if (contains_deferred_call(node->AssignStmt.lhs[i])) {
return true;
}
}
break;
case Ast_ValueDecl:
for_array(i, node->ValueDecl.values) {
if (contains_deferred_call(node->ValueDecl.values[i])) {
return true;
}
}
break;
}
return false;
}
gb_internal void check_stmt_list(CheckerContext *ctx, Slice<Ast *> const &stmts, u32 flags) {
if (stmts.count == 0) {
return;
}
if (flags&Stmt_CheckScopeDecls) {
check_scope_decls(ctx, stmts, cast(isize)(1.2*stmts.count));
}
bool ft_ok = (flags & Stmt_FallthroughAllowed) != 0;
flags &= ~Stmt_FallthroughAllowed;
isize max = stmts.count;
for (isize i = stmts.count-1; i >= 0; i--) {
if (stmts[i]->kind != Ast_EmptyStmt) {
break;
}
max--;
}
isize max_non_constant_declaration = stmts.count;
for (isize i = stmts.count-1; i >= 0; i--) {
if (stmts[i]->kind == Ast_EmptyStmt) {
// Okay
} else if (stmts[i]->kind == Ast_ValueDecl && !stmts[i]->ValueDecl.is_mutable) {
// Okay
} else {
break;
}
max_non_constant_declaration--;
}
for (isize i = 0; i < max; i++) {
Ast *n = stmts[i];
if (n->kind == Ast_EmptyStmt) {
continue;
}
u32 new_flags = flags;
if (ft_ok && i+1 == max) {
new_flags |= Stmt_FallthroughAllowed;
}
u32 prev_stmt_flags = ctx->stmt_flags;
ctx->stmt_flags = new_flags;
check_stmt(ctx, n, new_flags);
ctx->stmt_flags = prev_stmt_flags;
if (i+1 < max_non_constant_declaration) {
switch (n->kind) {
case Ast_ReturnStmt:
error(n, "Statements after this 'return' are never executed");
break;
case Ast_BranchStmt:
error(n, "Statements after this '%.*s' are never executed", LIT(n->BranchStmt.token.string));
break;
case Ast_ExprStmt:
if (is_diverging_stmt(n)) {
error(n, "Statements after a diverging procedure call are never executed");
}
break;
}
} else if (i+1 == max_non_constant_declaration) {
if (is_diverging_stmt(n)) {
for (isize j = 0; j < i; j++) {
Ast *stmt = stmts[j];
if (stmt->kind == Ast_ValueDecl && !stmt->ValueDecl.is_mutable) {
} else if (stmt->kind == Ast_DeferStmt) {
error(stmt, "Unreachable defer statement due to diverging procedure call at the end of the current scope");
} else if (contains_deferred_call(stmt)) {
error(stmt, "Unreachable deferred procedure call due to a diverging procedure call at the end of the current scope");
}
}
}
}
}
}
gb_internal bool check_is_terminating_list(Slice<Ast *> const &stmts, String const &label) {
// Iterate backwards
for (isize n = stmts.count-1; n >= 0; n--) {
Ast *stmt = stmts[n];
if (stmt->kind == Ast_EmptyStmt) {
// Okay
} else if (stmt->kind == Ast_ValueDecl && !stmt->ValueDecl.is_mutable) {
// Okay
} else if (is_diverging_stmt(stmt)) {
return true;
} else {
return check_is_terminating(stmt, label);
}
}
return false;
}
gb_internal bool check_has_break_list(Slice<Ast *> const &stmts, String const &label, bool implicit) {
for (Ast *stmt : stmts) {
if (check_has_break(stmt, label, implicit)) {
return true;
}
}
return false;
}
gb_internal bool check_has_break_expr(Ast * expr, String const &label) {
if (expr && expr->viral_state_flags & ViralStateFlag_ContainsOrBreak) {
return true;
}
return false;
}
gb_internal bool check_has_break_expr_list(Slice<Ast *> const &exprs, String const &label) {
for (Ast *expr : exprs) {
if (check_has_break_expr(expr, label)) {
return true;
}
}
return false;
}
gb_internal bool check_has_break(Ast *stmt, String const &label, bool implicit) {
switch (stmt->kind) {
case Ast_BranchStmt:
if (stmt->BranchStmt.token.kind == Token_break) {
if (stmt->BranchStmt.label == nullptr) {
return implicit;
}
if (stmt->BranchStmt.label->kind == Ast_Ident &&
stmt->BranchStmt.label->Ident.token.string == label) {
return true;
}
}
break;
case Ast_BlockStmt:
return check_has_break_list(stmt->BlockStmt.stmts, label, implicit);
case Ast_IfStmt:
if (stmt->IfStmt.init && check_has_break(stmt->IfStmt.init, label, implicit)) {
return true;
}
if (stmt->IfStmt.cond && check_has_break_expr(stmt->IfStmt.cond, label)) {
return true;
}
if (check_has_break(stmt->IfStmt.body, label, implicit) ||
(stmt->IfStmt.else_stmt != nullptr && check_has_break(stmt->IfStmt.else_stmt, label, implicit))) {
return true;
}
break;
case Ast_CaseClause:
return check_has_break_list(stmt->CaseClause.stmts, label, implicit);
case Ast_SwitchStmt:
if (stmt->SwitchStmt.init && check_has_break_expr(stmt->SwitchStmt.init, label)) {
return true;
}
if (label != "" && check_has_break(stmt->SwitchStmt.body, label, false)) {
return true;
}
break;
case Ast_TypeSwitchStmt:
if (label != "" && check_has_break(stmt->TypeSwitchStmt.body, label, false)) {
return true;
}
break;
case Ast_ForStmt:
if (stmt->ForStmt.init && check_has_break(stmt->ForStmt.init, label, implicit)) {
return true;
}
if (stmt->ForStmt.cond && check_has_break_expr(stmt->ForStmt.cond, label)) {
return true;
}
if (stmt->ForStmt.post && check_has_break(stmt->ForStmt.post, label, implicit)) {
return true;
}
if (label != "" && check_has_break(stmt->ForStmt.body, label, false)) {
return true;
}
break;
case Ast_RangeStmt:
if (label != "" && check_has_break(stmt->RangeStmt.body, label, false)) {
return true;
}
break;
case Ast_ExprStmt:
if (stmt->ExprStmt.expr->viral_state_flags & ViralStateFlag_ContainsOrBreak) {
return true;
}
break;
case Ast_ValueDecl:
if (stmt->ValueDecl.is_mutable && check_has_break_expr_list(stmt->ValueDecl.values, label)) {
return true;
}
break;
case Ast_AssignStmt:
if (check_has_break_expr_list(stmt->AssignStmt.lhs, label)) {
return true;
}
if (check_has_break_expr_list(stmt->AssignStmt.rhs, label)) {
return true;
}
break;
}
return false;
}
String label_string(Ast *node) {
GB_ASSERT(node != nullptr);
if (node->kind == Ast_Ident) {
return node->Ident.token.string;
} else if (node->kind == Ast_Label) {
return label_string(node->Label.name);
}
GB_ASSERT("INVALID LABEL");
return {};
}
// NOTE(bill): The last expression has to be a 'return' statement
// TODO(bill): This is a mild hack and should be probably handled properly
gb_internal bool check_is_terminating(Ast *node, String const &label) {
switch (node->kind) {
case_ast_node(rs, ReturnStmt, node);
return true;
case_end;
case_ast_node(bs, BlockStmt, node);
if (check_is_terminating_list(bs->stmts, label)) {
if (bs->label != nullptr) {
return check_is_terminating_list(bs->stmts, label_string(bs->label));
}
return true;
}
case_end;
case_ast_node(es, ExprStmt, node);
return check_is_terminating(unparen_expr(es->expr), label);
case_end;
case_ast_node(vd, ValueDecl, node);
return check_has_break_expr_list(vd->values, label);
case_end;
case_ast_node(as, AssignStmt, node);
return check_has_break_expr_list(as->lhs, label) ||
check_has_break_expr_list(as->rhs, label);
case_end;
case_ast_node(bs, BranchStmt, node);
return bs->token.kind == Token_fallthrough;
case_end;
case_ast_node(is, IfStmt, node);
if (is->else_stmt != nullptr) {
if (check_is_terminating(is->body, label) &&
check_is_terminating(is->else_stmt, label)) {
return true;
}
}
case_end;
case_ast_node(ws, WhenStmt, node);
// TODO(bill): Is this logic correct for when statements?
auto const &tv = ws->cond->tav;
if (tv.mode != Addressing_Constant) {
// NOTE(bill): Check the things regardless as a bug occurred earlier
if (ws->else_stmt != nullptr) {
if (check_is_terminating(ws->body, label) &&
check_is_terminating(ws->else_stmt, label)) {
return true;
}
}
return false;
}
if (tv.value.kind == ExactValue_Bool) {
if (tv.value.value_bool) {
return check_is_terminating(ws->body, label);
} else {
if (ws->else_stmt == nullptr) {
return false;
}
return check_is_terminating(ws->else_stmt, label);
}
}
case_end;
case_ast_node(fs, ForStmt, node);
if (fs->cond == nullptr && !check_has_break(fs->body, label, true)) {
if (fs->label) {
return !check_has_break(fs->body, label_string(fs->label), false);
}
return true;
}
case_end;
case_ast_node(rs, UnrollRangeStmt, node);
return false;
case_end;
case_ast_node(rs, RangeStmt, node);
return false;
case_end;
case_ast_node(ss, SwitchStmt, node);
bool has_default = false;
for_array(i, ss->body->BlockStmt.stmts) {
Ast *clause = ss->body->BlockStmt.stmts[i];
ast_node(cc, CaseClause, clause);
if (cc->list.count == 0) {
has_default = true;
}
if (!check_is_terminating_list(cc->stmts, label) ||
check_has_break_list(cc->stmts, label, true)) {
return false;
}
}
return has_default;
case_end;
case_ast_node(ss, TypeSwitchStmt, node);
bool has_default = false;
for_array(i, ss->body->BlockStmt.stmts) {
Ast *clause = ss->body->BlockStmt.stmts[i];
ast_node(cc, CaseClause, clause);
if (cc->list.count == 0) {
has_default = true;
}
if (!check_is_terminating_list(cc->stmts, label) ||
check_has_break_list(cc->stmts, label, true)) {
return false;
}
}
return has_default;
case_end;
}
return false;
}
gb_internal Type *check_assignment_variable(CheckerContext *ctx, Operand *lhs, Operand *rhs) {
if (rhs->mode == Addressing_Invalid) {
return nullptr;
}
if (rhs->type == t_invalid &&
rhs->mode != Addressing_ProcGroup &&
rhs->mode != Addressing_Builtin) {
return nullptr;
}
Ast *node = unparen_expr(lhs->expr);
check_no_copy_assignment(*rhs, str_lit("assignment"));
// NOTE(bill): Ignore assignments to '_'
if (is_blank_ident(node)) {
check_assignment(ctx, rhs, nullptr, str_lit("assignment to '_' identifier"));
if (rhs->mode == Addressing_Invalid) {
return nullptr;
}
return rhs->type;
}
Entity *e = nullptr;
bool used = false;
if (lhs->mode == Addressing_Invalid ||
(lhs->type == t_invalid &&
lhs->mode != Addressing_ProcGroup &&
lhs->mode != Addressing_Builtin)) {
return nullptr;
}
if (rhs->mode == Addressing_ProcGroup) {
Array<Entity *> procs = proc_group_entities(ctx, *rhs);
GB_ASSERT(procs.count > 0);
// NOTE(bill): These should be done
for_array(i, procs) {
Type *t = base_type(procs[i]->type);
if (t == t_invalid) {
continue;
}
Operand x = {};
x.mode = Addressing_Value;
x.type = t;
if (check_is_assignable_to(ctx, &x, lhs->type)) {
e = procs[i];
add_entity_use(ctx, rhs->expr, e);
break;
}
}
if (e != nullptr) {
rhs->mode = Addressing_Value;
rhs->type = e->type;
rhs->proc_group = nullptr;
}
} else {
if (node->kind == Ast_Ident) {
ast_node(i, Ident, node);
e = scope_lookup(ctx->scope, i->token.string);
if (e != nullptr && e->kind == Entity_Variable) {
used = (e->flags & EntityFlag_Used) != 0; // NOTE(bill): Make backup just in case
}
}
}
if (e != nullptr && used) {
e->flags |= EntityFlag_Used;
}
Type *assignment_type = lhs->type;
if (rhs->mode == Addressing_Type && is_type_polymorphic(rhs->type)) {
gbString t = type_to_string(rhs->type);
error(rhs->expr, "Invalid use of a non-specialized polymorphic type '%s'", t);
gb_string_free(t);
}
switch (lhs->mode) {
case Addressing_Invalid:
return nullptr;
case Addressing_Variable:
break;
case Addressing_MapIndex: {
Ast *ln = unparen_expr(lhs->expr);
if (ln->kind == Ast_IndexExpr) {
Ast *x = ln->IndexExpr.expr;
TypeAndValue tav = x->tav;
GB_ASSERT(tav.mode != Addressing_Invalid);
if (tav.mode != Addressing_Variable) {
if (!is_type_pointer(tav.type)) {
gbString str = expr_to_string(lhs->expr);
error(lhs->expr, "Cannot assign to the value of a map '%s'", str);
gb_string_free(str);
return nullptr;
}
}
}
break;
}
case Addressing_Context:
break;
case Addressing_SoaVariable:
break;
10BC8
case Addressing_SwizzleVariable:
break;
default: {
if (lhs->expr->kind == Ast_SelectorExpr) {
// NOTE(bill): Extra error checks
Operand op_c = {Addressing_Invalid};
ast_node(se, SelectorExpr, lhs->expr);
check_expr(ctx, &op_c, se->expr);
if (op_c.mode == Addressing_MapIndex) {
gbString str = expr_to_string(lhs->expr);
error(lhs->expr, "Cannot assign to struct field '%s' in map", str);
gb_string_free(str);
return nullptr;
}
}
Entity *e = entity_of_node(lhs->expr);
Entity *original_e = e;
Ast *name = unparen_expr(lhs->expr);
while (name->kind == Ast_SelectorExpr) {
name = name->SelectorExpr.expr;
e = entity_of_node(name);
}
if (e == nullptr) {
e = original_e;
}
gbString str = expr_to_string(lhs->expr);
if (e != nullptr && e->flags & EntityFlag_Param) {
ERROR_BLOCK();
if (e->flags & EntityFlag_Using) {
error(lhs->expr, "Cannot assign to '%s' which is from a 'using' procedure parameter", str);
} else {
error(lhs->expr, "Cannot assign to '%s' which is a procedure parameter", str);
}
if (is_type_pointer(e->type)) {
error_line("\tSuggestion: Did you mean to shadow it? '%.*s := %.*s'?\n", LIT(e->token.string), LIT(e->token.string));
} else {
error_line("\tSuggestion: Did you mean to pass '%.*s' by pointer?\n", LIT(e->token.string));
}
show_error_on_line(e->token.pos, token_pos_end(e->token));
} else {
ERROR_BLOCK();
error(lhs->expr, "Cannot assign to '%s'", str);
if (e && e->flags & EntityFlag_ForValue) {
isize offset = show_error_on_line(e->token.pos, token_pos_end(e->token));
if (offset < 0) {
if (is_type_map(e->type)) {
error_line("\tSuggestion: Did you mean? 'for key, &%.*s in ...'\n", LIT(e->token.string));
} else {
error_line("\tSuggestion: Did you mean? 'for &%.*s in ...'\n", LIT(e->token.string));
}
} else {
error_line("\t");
for (isize i = 0; i < offset-1; i++) {
error_line(" ");
}
error_line("'%.*s' is immutable, declare it as '&%.*s' to make it mutable\n", LIT(e->token.string), LIT(e->token.string));
}
} else if (e && e->flags & EntityFlag_SwitchValue) {
isize offset = show_error_on_line(e->token.pos, token_pos_end(e->token));
if (offset < 0) {
error_line("\tSuggestion: Did you mean? 'switch &%.*s in ...'\n", LIT(e->token.string));
} else {
error_line("\t");
for (isize i = 0; i < offset-1; i++) {
error_line(" ");
}
error_line("'%.*s' is immutable, declare it as '&%.*s' to make it mutable\n", LIT(e->token.string), LIT(e->token.string));
}
}
}
gb_string_free(str);
break;
}
}
Entity *lhs_e = entity_of_node(lhs->expr);
u8 prev_bit_field_bit_size = ctx->bit_field_bit_size;
if (lhs_e && lhs_e->kind == Entity_Variable && lhs_e->Variable.bit_field_bit_size) {
// HACK NOTE(bill): This is a bit of a hack, but it will work fine for this use case
ctx->bit_field_bit_size = lhs_e->Variable.bit_field_bit_size;
}
check_assignment(ctx, rhs, assignment_type, str_lit("assignment"));
ctx->bit_field_bit_size = prev_bit_field_bit_size;
if (rhs->mode == Addressing_Invalid) {
return nullptr;
}
return rhs->type;
}
gb_internal void check_stmt_internal(CheckerContext *ctx, Ast *node, u32 flags);
gb_internal void check_stmt(CheckerContext *ctx, Ast *node, u32 flags) {
u32 prev_state_flags = ctx->state_flags;
if (node->state_flags != 0) {
u32 in = node->state_flags;
u32 out = ctx->state_flags;
if (in & StateFlag_no_bounds_check) {
out |= StateFlag_no_bounds_check;
out &= ~StateFlag_bounds_check;
} else if (in & StateFlag_bounds_check) {
out |= StateFlag_bounds_check;
out &= ~StateFlag_no_bounds_check;
}
if (in & StateFlag_no_type_assert) {
out |= StateFlag_no_type_assert;
out &= ~StateFlag_type_assert;
} else if (in & StateFlag_type_assert) {
out |= StateFlag_type_assert;
out &= ~StateFlag_no_type_assert;
}
ctx->state_flags = out;
}
check_stmt_internal(ctx, node, flags);
ctx->state_flags = prev_state_flags;
}
gb_internal void check_when_stmt(CheckerContext *ctx, AstWhenStmt *ws, u32 flags) {
Operand operand = {Addressing_Invalid};
check_expr(ctx, &operand, ws->cond);
if (operand.mode != Addressing_Constant || !is_type_boolean(operand.type)) {
error(ws->cond, "Non-constant boolean 'when' condition");
return;
}
if (ws->body == nullptr || ws->body->kind != Ast_BlockStmt) {
error(ws->cond, "Invalid body for 'when' statement");
return;
}
if (operand.value.kind == ExactValue_Bool &&
operand.value.value_bool) {
check_stmt_list(ctx, ws->body->BlockStmt.stmts, flags);
} else if (ws->else_stmt) {
switch (ws->else_stmt->kind) {
case Ast_BlockStmt:
check_stmt_list(ctx, ws->else_stmt->BlockStmt.stmts, flags);
break;
case Ast_WhenStmt:
check_when_stmt(ctx, &ws->else_stmt->WhenStmt, flags);
break;
default:
error(ws->else_stmt, "Invalid 'else' statement in 'when' statement");
break;
}
}
}
gb_internal void check_label(CheckerContext *ctx, Ast *label, Ast *parent) {
if (label == nullptr) {
return;
}
ast_node(l, Label, label);
if (l->name->kind != Ast_Ident) {
error(l->name, "A label's name must be an identifier");
return;
}
String name = l->name->Ident.token.string;
if (is_blank_ident(name)) {
error(l->name, "A label's name cannot be a blank identifier");
return;
}
if (ctx->curr_proc_decl == nullptr) {
error(l->name, "A label is only allowed within a procedure");
return;
}
GB_ASSERT(ctx->decl != nullptr);
bool ok = true;
for_array(i, ctx->decl->labels) {
BlockLabel bl = ctx->decl->labels[i];
if (bl.name == name) {
error(label, "Duplicate label with the name '%.*s'", LIT(name));
ok = false;
break;
}
}
Entity *e = alloc_entity_label(ctx->scope, l->name->Ident.token, t_invalid, label, parent);
add_entity(ctx, ctx->scope, l->name, e);
e->parent_proc_decl = ctx->curr_proc_decl;
if (ok) {
BlockLabel bl = {name, label};
array_add(&ctx->decl->labels, bl);
}
}
// Returns 'true' for 'continue', 'false' for 'return'
gb_internal bool check_using_stmt_entity(CheckerContext *ctx, AstUsingStmt *us, Ast *expr, bool is_selector, Entity *e) {
if (e == nullptr) {
if (is_blank_ident(expr)) {
error(us->token, "'using' in a statement is not allowed with the blank identifier '_'");
} else {
error(us->token, "'using' applied to an unknown entity");
}
return true;
}
add_entity_use(ctx, expr, e);
ERROR_BLOCK();
switch (e->kind) {
case Entity_TypeName: {
Type *t = base_type(e->type);
if (t->kind == Type_Enum) {
for_array(i, t->Enum.fields) {
Entity *f = t->Enum.fields[i];
if (!is_entity_exported(f)) continue;
Entity *found = scope_insert(ctx->scope, f);
if (found != nullptr) {
gbString expr_str = expr_to_string(expr);
error(us->token, "Namespace collision while 'using' enum '%s' of: %.*s", expr_str, LIT(found->token.string));
gb_string_free(expr_str);
return false;
}
f->using_parent = e;
}
} else {
error(us->token, "'using' can be only applied to enum type entities");
}
break;
}
case Entity_ImportName: {
Scope *scope = e->ImportName.scope;
rw_mutex_lock(&scope->mutex);
defer (rw_mutex_unlock(&scope->mutex));
for (auto const &entry : scope->elements) {
String name = entry.key;
Entity *decl = entry.value;
if (!is_entity_exported(decl, true)) continue;
Entity *found = scope_insert_with_name(ctx->scope, name, decl);
if (found != nullptr) {
gbString expr_str = expr_to_string(expr);
error(us->token,
"Namespace collision while 'using' import name '%s' of: %.*s\n"
"\tat %s\n"
"\tat %s",
expr_str, LIT(found->token.string),
token_pos_to_string(found->token.pos),
token_pos_to_string(decl->token.pos)
);
gb_string_free(expr_str);
return false;
}
}
break;
}
case Entity_Variable: {
bool is_ptr = is_type_pointer(e->type);
Type *t = base_type(type_deref(e->type));
if (t->kind == Type_Struct) {
wait_signal_until_available(&t->Struct.fields_wait_signal);
Scope *found = t->Struct.scope;
GB_ASSERT(found != nullptr);
for (auto const &entry : found->elements) {
Entity *f = entry.value;
if (f->kind == Entity_Variable) {
Entity *uvar = alloc_entity_using_variable(e, f->token, f->type, expr);
if (!is_ptr && e->flags & EntityFlag_Value) uvar->flags |= EntityFlag_Value;
if (e->flags & EntityFlag_Param) uvar->flags |= EntityFlag_Param;
Entity *prev = scope_insert(ctx->scope, uvar);
if (prev != nullptr) {
gbString expr_str = expr_to_string(expr);
error(us->token, "Namespace collision while using '%s' of: '%.*s'", expr_str, LIT(prev->token.string));
gb_string_free(expr_str);
return false;
}
}
}
} else {
error(us->token, "'using' can only be applied to variables of type 'struct'");
return false;
}
break;
}
case Entity_Constant:
error(us->token, "'using' cannot be applied to a constant");
break;
case Entity_Procedure:
case Entity_ProcGroup:
case Entity_Builtin:
error(us->token, "'using' cannot be applied to a procedure");
break;
case Entity_Nil:
error(us->token, "'using' cannot be applied to 'nil'");
break;
case Entity_Label:
error(us->token, "'using' cannot be applied to a label");
break;
case Entity_Invalid:
error(us->token, "'using' cannot be applied to an invalid entity");
break;
default:
GB_PANIC("TODO(bill): 'using' other expressions?");
}
return true;
}
gb_internal void error_var_decl_identifier(Ast *name) {
GB_ASSERT(name != nullptr);
GB_ASSERT(name->kind != Ast_Ident);
ERROR_BLOCK();
gbString s = expr_to_string(name);
defer (gb_string_free(s));
error(name, "A variable declaration must be an identifier, got '%s'", s);
if (name->kind == Ast_Implicit) {
String imp = name->Implicit.string;
if (imp == "context") {
error_line("\tSuggestion: '%.*s' is a reserved keyword, would 'ctx' suffice?\n", LIT(imp));
} else {
error_line("\tNote: '%.*s' is a reserved keyword\n", LIT(imp));
}
}
}
gb_internal void check_inline_range_stmt(CheckerContext *ctx, Ast *node, u32 mod_flags) {
ast_node(irs, UnrollRangeStmt, node);
check_open_scope(ctx, node);
Type *val0 = nullptr;
Type *val1 = nullptr;
Entity *entities[2] = {};
isize entity_count = 0;
Ast *expr = unparen_expr(irs->expr);
ExactValue inline_for_depth = exact_value_i64(0);
if (is_ast_range(expr)) {
ast_node(ie, BinaryExpr, expr);
Operand x = {};
Operand y = {};
bool ok = check_range(ctx, expr, true, &x, &y, &inline_for_depth);
if (!ok) {
goto skip_expr;
}
val0 = x.type;
val1 = t_int;
} else {
Operand operand = {Addressing_Invalid};
check_expr_or_type(ctx, &operand, irs->expr);
if (operand.mode == Addressing_Type) {
if (!is_type_enum(operand.type)) {
gbString t = type_to_string(operand.type);
error(operand.expr, "Cannot iterate over the type '%s'", t);
gb_string_free(t);
goto skip_expr;
} else {
val0 = operand.type;
val1 = t_int;
add_type_info_type(ctx, operand.type);
Type *bt = base_type(operand.type);
inline_for_depth = exact_value_i64(bt->Enum.fields.count);
goto skip_expr;
}
} else if (operand.mode != Addressing_Invalid) {
Type *t = base_type(operand.type);
switch (t->kind) {
case Type_Basic:
if (is_type_string(t) && t->Basic.kind != Basic_cstring) {
val0 = t_rune;
val1 = t_int;
inline_for_depth = exact_value_i64(operand.value.value_string.len);
}
break;
case Type_Array:
val0 = t->Array.elem;
val1 = t_int;
inline_for_depth = exact_value_i64(t->Array.count);
break;
case Type_EnumeratedArray:
val0 = t->EnumeratedArray.elem;
val1 = t->EnumeratedArray.index;
inline_for_depth = exact_value_i64(t->EnumeratedArray.count);
break;
}
}
if (val0 == nullptr) {
gbString s = expr_to_string(operand.expr);
gbString t = type_to_string(operand.type);
error(operand.expr, "Cannot iterate over '%s' of type '%s' in an '#unroll for' statement", s, t);
gb_string_free(t);
gb_string_free(s);
} else if (operand.mode != Addressing_Constant) {
error(operand.expr, "An '#unroll for' expression must be known at compile time");
}
}
skip_expr:; // NOTE(zhiayang): again, declaring a variable immediately after a label... weird.
Ast * lhs[2] = {irs->val0, irs->val1};
Type *rhs[2] = {val0, val1};
for (isize i = 0; i < 2; i++) {
if (lhs[i] == nullptr) {
continue;
}
Ast * name = lhs[i];
Type *type = rhs[i];
Entity *entity = nullptr;
if (name->kind == Ast_Ident) {
Token token = name->Ident.token;
String str = token.string;
Entity *found = nullptr;
if (!is_blank_ident(str)) {
found = scope_lookup_current(ctx->scope, str);
}
if (found == nullptr) {
entity = alloc_entity_variable(ctx->scope, token, type, EntityState_Resolved);
entity->flags |= EntityFlag_Value;
add_entity_definition(&ctx->checker->info, name, entity);
} else {
TokenPos pos = found->token.pos;
error(token,
"Redeclaration of '%.*s' in this scope\n"
"\tat %s", LIT(str), token_pos_to_string(pos));
entity = found;
}
} else {
error_var_decl_identifier(name);
}
if (entity == nullptr) {
entity = alloc_entity_dummy_variable(builtin_pkg->scope, ast_token(name));
}