Separate check_stmt code into separate procedures

This commit is contained in:
gingerBill
2023-02-01 23:40:42 +00:00
parent f59846377d
commit 51ae21a029
+314 -297
View File
@@ -1912,6 +1912,315 @@ gb_internal void check_value_decl_stmt(CheckerContext *ctx, Ast *node, u32 mod_f
}
}
gb_internal void check_expr_stmt(CheckerContext *ctx, Ast *node) {
ast_node(es, ExprStmt, node);
Operand operand = {Addressing_Invalid};
ExprKind kind = check_expr_base(ctx, &operand, es->expr, nullptr);
switch (operand.mode) {
case Addressing_Type:
{
gbString str = type_to_string(operand.type);
error(node, "'%s' is not an expression", str);
gb_string_free(str);
break;
}
case Addressing_NoValue:
return;
}
if (kind == Expr_Stmt) {
return;
}
Ast *expr = strip_or_return_expr(operand.expr);
if (expr->kind == Ast_CallExpr) {
BuiltinProcId builtin_id = BuiltinProc_Invalid;
bool do_require = false;
AstCallExpr *ce = &expr->CallExpr;
Type *t = base_type(type_of_expr(ce->proc));
if (t->kind == Type_Proc) {
do_require = t->Proc.require_results;
} else if (check_stmt_internal_builtin_proc_id(ce->proc, &builtin_id)) {
auto const &bp = builtin_procs[builtin_id];
do_require = bp.kind == Expr_Expr && !bp.ignore_results;
}
if (do_require) {
gbString expr_str = expr_to_string(ce->proc);
error(node, "'%s' requires that its results must be handled", expr_str);
gb_string_free(expr_str);
}
return;
} else if (expr->kind == Ast_SelectorCallExpr) {
BuiltinProcId builtin_id = BuiltinProc_Invalid;
bool do_require = false;
AstSelectorCallExpr *se = &expr->SelectorCallExpr;
ast_node(ce, CallExpr, se->call);
Type *t = base_type(type_of_expr(ce->proc));
if (t == nullptr) {
gbString expr_str = expr_to_string(ce->proc);
error(node, "'%s' is not a value field nor procedure", expr_str);
gb_string_free(expr_str);
return;
}
if (t->kind == Type_Proc) {
do_require = t->Proc.require_results;
} else if (check_stmt_internal_builtin_proc_id(ce->proc, &builtin_id)) {
auto const &bp = builtin_procs[builtin_id];
do_require = bp.kind == Expr_Expr && !bp.ignore_results;
}
if (do_require) {
gbString expr_str = expr_to_string(ce->proc);
error(node, "'%s' requires that its results must be handled", expr_str);
gb_string_free(expr_str);
}
return;
}
gbString expr_str = expr_to_string(operand.expr);
error(node, "Expression is not used: '%s'", expr_str);
gb_string_free(expr_str);
if (operand.expr->kind == Ast_BinaryExpr) {
ast_node(be, BinaryExpr, operand.expr);
if (be->op.kind != Token_CmpEq) {
return;
}
switch (be->left->tav.mode) {
case Addressing_Context:
case Addressing_Variable:
case Addressing_MapIndex:
case Addressing_SoaVariable:
{
gbString lhs = expr_to_string(be->left);
gbString rhs = expr_to_string(be->right);
error_line("\tSuggestion: Did you mean to do an assignment?\n", lhs, rhs);
error_line("\t '%s = %s;'\n", lhs, rhs);
gb_string_free(rhs);
gb_string_free(lhs);
}
break;
}
}
}
gb_internal void check_assign_stmt(CheckerContext *ctx, Ast *node) {
ast_node(as, AssignStmt, node);
if (as->op.kind == Token_Eq) {
// a, b, c = 1, 2, 3; // Multisided
isize lhs_count = as->lhs.count;
if (lhs_count == 0) {
error(as->op, "Missing lhs in assignment statement");
return;
}
TEMPORARY_ALLOCATOR_GUARD();
// NOTE(bill): If there is a bad syntax error, rhs > lhs which would mean there would need to be
// an extra allocation
auto lhs_operands = array_make<Operand>(temporary_allocator(), lhs_count);
auto rhs_operands = array_make<Operand>(temporary_allocator(), 0, 2*lhs_count);
for_array(i, as->lhs) {
if (is_blank_ident(as->lhs[i])) {
Operand *o = &lhs_operands[i];
o->expr = as->lhs[i];
o->mode = Addressing_Value;
} else {
ctx->assignment_lhs_hint = unparen_expr(as->lhs[i]);
check_expr(ctx, &lhs_operands[i], as->lhs[i]);
}
}
ctx->assignment_lhs_hint = nullptr; // Reset the assignment_lhs_hint
check_assignment_arguments(ctx, lhs_operands, &rhs_operands, as->rhs);
auto lhs_to_ignore = array_make<bool>(temporary_allocator(), lhs_count);
isize rhs_count = rhs_operands.count;
isize max = gb_min(lhs_count, rhs_count);
for (isize i = 0; i < max; i++) {
if (lhs_to_ignore[i]) {
continue;
}
check_assignment_variable(ctx, &lhs_operands[i], &rhs_operands[i]);
}
if (lhs_count != rhs_count) {
error(as->lhs[0], "Assignment count mismatch '%td' = '%td'", lhs_count, rhs_count);
}
} else {
// a += 1; // Single-sided
Token op = as->op;
if (as->lhs.count != 1 || as->rhs.count != 1) {
error(op, "Assignment operation '%.*s' requires single-valued expressions", LIT(op.string));
return;
}
if (!gb_is_between(op.kind, Token__AssignOpBegin+1, Token__AssignOpEnd-1)) {
error(op, "Unknown Assignment operation '%.*s'", LIT(op.string));
return;
}
Operand lhs = {Addressing_Invalid};
Operand rhs = {Addressing_Invalid};
Ast *binary_expr = alloc_ast_node(node->file(), Ast_BinaryExpr);
ast_node(be, BinaryExpr, binary_expr);
be->op = op;
be->op.kind = cast(TokenKind)(cast(i32)be->op.kind - (Token_AddEq - Token_Add));
// NOTE(bill): Only use the first one will be used
be->left = as->lhs[0];
be->right = as->rhs[0];
check_expr(ctx, &lhs, as->lhs[0]);
check_binary_expr(ctx, &rhs, binary_expr, nullptr, true);
if (rhs.mode != Addressing_Invalid) {
// NOTE(bill): Only use the first one will be used
check_assignment_variable(ctx, &lhs, &rhs);
}
}
}
gb_internal void check_if_stmt(CheckerContext *ctx, Ast *node, u32 mod_flags) {
ast_node(is, IfStmt, node);
check_open_scope(ctx, node);
check_label(ctx, is->label, node);
if (is->init != nullptr) {
check_stmt(ctx, is->init, 0);
}
Operand operand = {Addressing_Invalid};
check_expr(ctx, &operand, is->cond);
if (operand.mode != Addressing_Invalid && !is_type_boolean(operand.type)) {
error(is->cond, "Non-boolean condition in 'if' statement");
}
check_stmt(ctx, is->body, mod_flags);
if (is->else_stmt != nullptr) {
switch (is->else_stmt->kind) {
case Ast_IfStmt:
case Ast_BlockStmt:
check_stmt(ctx, is->else_stmt, mod_flags);
break;
default:
error(is->else_stmt, "Invalid 'else' statement in 'if' statement");
break;
}
}
check_close_scope(ctx);
}
gb_internal void check_return_stmt(CheckerContext *ctx, Ast *node) {
ast_node(rs, ReturnStmt, node);
GB_ASSERT(ctx->curr_proc_sig != nullptr);
if (ctx->in_defer) {
error(rs->token, "'return' cannot be used within a defer statement");
return;
}
Type *proc_type = ctx->curr_proc_sig;
GB_ASSERT(proc_type != nullptr);
GB_ASSERT(proc_type->kind == Type_Proc);
TypeProc *pt = &proc_type->Proc;
if (pt->diverging) {
error(rs->token, "Diverging procedures may not return");
return;
}
Entity **result_entities = nullptr;
isize result_count = 0;
bool has_named_results = pt->has_named_results;
if (pt->results) {
result_entities = proc_type->Proc.results->Tuple.variables.data;
result_count = proc_type->Proc.results->Tuple.variables.count;
}
auto operands = array_make<Operand>(heap_allocator(), 0, 2*rs->results.count);
defer (array_free(&operands));
check_unpack_arguments(ctx, result_entities, result_count, &operands, rs->results, true, false);
if (result_count == 0 && rs->results.count > 0) {
error(rs->results[0], "No return values expected");
} else if (has_named_results && operands.count == 0) {
// Okay
} else if (operands.count != result_count) {
// Ignore error message as it has most likely already been reported
if (all_operands_valid(operands)) {
error(node, "Expected %td return values, got %td", result_count, operands.count);
}
} else {
for (isize i = 0; i < result_count; i++) {
Entity *e = pt->results->Tuple.variables[i];
Operand *o = &operands[i];
check_assignment(ctx, o, e->type, str_lit("return statement"));
if (is_type_untyped(o->type)) {
update_untyped_expr_type(ctx, o->expr, e->type, true);
}
// NOTE(bill): This is very basic escape analysis
// This needs to be improved tremendously, and a lot of it done during the
// middle-end (or LLVM side) to improve checks and error messages
Ast *expr = unparen_expr(o->expr);
if (expr->kind == Ast_UnaryExpr && expr->UnaryExpr.op.kind == Token_And) {
Ast *x = unparen_expr(expr->UnaryExpr.expr);
if (x->kind == Ast_CompoundLit) {
error(expr, "Cannot return the address to a stack value from a procedure");
} else if (x->kind == Ast_IndexExpr) {
Ast *array = x->IndexExpr.expr;
if (is_type_array_like(type_of_expr(array)) && check_expr_is_stack_variable(array)) {
gbString t = type_to_string(type_of_expr(array));
error(expr, "Cannot return the address to an element of stack variable from a procedure, of type %s", t);
gb_string_free(t);
}
} else {
if (check_expr_is_stack_variable(x)) {
error(expr, "Cannot return the address to a stack variable from a procedure");
}
}
}
}
}
}
gb_internal void check_for_stmt(CheckerContext *ctx, Ast *node, u32 mod_flags) {
ast_node(fs, ForStmt, node);
mod_flags |= Stmt_BreakAllowed | Stmt_ContinueAllowed;
check_open_scope(ctx, node);
check_label(ctx, fs->label, node); // TODO(bill): What should the label's "scope" be?
if (fs->init != nullptr) {
check_stmt(ctx, fs->init, 0);
}
if (fs->cond != nullptr) {
Operand o = {Addressing_Invalid};
check_expr(ctx, &o, fs->cond);
if (o.mode != Addressing_Invalid && !is_type_boolean(o.type)) {
error(fs->cond, "Non-boolean condition in 'for' statement");
}
}
if (fs->post != nullptr) {
check_stmt(ctx, fs->post, 0);
if (fs->post->kind != Ast_AssignStmt) {
error(fs->post, "'for' statement post statement must be a simple statement");
}
}
check_stmt(ctx, fs->body, mod_flags);
check_close_scope(ctx);
}
gb_internal void check_stmt_internal(CheckerContext *ctx, Ast *node, u32 flags) {
u32 mod_flags = flags & (~Stmt_FallthroughAllowed);
switch (node->kind) {
@@ -1920,179 +2229,11 @@ gb_internal void check_stmt_internal(CheckerContext *ctx, Ast *node, u32 flags)
case_ast_node(_, BadDecl, node); case_end;
case_ast_node(es, ExprStmt, node)
Operand operand = {Addressing_Invalid};
ExprKind kind = check_expr_base(ctx, &operand, es->expr, nullptr);
switch (operand.mode) {
case Addressing_Type: {
gbString str = type_to_string(operand.type);
error(node, "'%s' is not an expression", str);
gb_string_free(str);
break;
}
case Addressing_NoValue:
return;
default: {
if (kind == Expr_Stmt) {
return;
}
Ast *expr = strip_or_return_expr(operand.expr);
if (expr->kind == Ast_CallExpr) {
BuiltinProcId builtin_id = BuiltinProc_Invalid;
bool do_require = false;
AstCallExpr *ce = &expr->CallExpr;
Type *t = base_type(type_of_expr(ce->proc));
if (t->kind == Type_Proc) {
do_require = t->Proc.require_results;
} else if (check_stmt_internal_builtin_proc_id(ce->proc, &builtin_id)) {
auto const &bp = builtin_procs[builtin_id];
do_require = bp.kind == Expr_Expr && !bp.ignore_results;
}
if (do_require) {
gbString expr_str = expr_to_string(ce->proc);
error(node, "'%s' requires that its results must be handled", expr_str);
gb_string_free(expr_str);
}
return;
} else if (expr->kind == Ast_SelectorCallExpr) {
BuiltinProcId builtin_id = BuiltinProc_Invalid;
bool do_require = false;
AstSelectorCallExpr *se = &expr->SelectorCallExpr;
ast_node(ce, CallExpr, se->call);
Type *t = base_type(type_of_expr(ce->proc));
if (t == nullptr) {
gbString expr_str = expr_to_string(ce->proc);
error(node, "'%s' is not a value field nor procedure", expr_str);
gb_string_free(expr_str);
return;
}
if (t->kind == Type_Proc) {
do_require = t->Proc.require_results;
} else if (check_stmt_internal_builtin_proc_id(ce->proc, &builtin_id)) {
auto const &bp = builtin_procs[builtin_id];
do_require = bp.kind == Expr_Expr && !bp.ignore_results;
}
if (do_require) {
gbString expr_str = expr_to_string(ce->proc);
error(node, "'%s' requires that its results must be handled", expr_str);
gb_string_free(expr_str);
}
return;
}
gbString expr_str = expr_to_string(operand.expr);
error(node, "Expression is not used: '%s'", expr_str);
gb_string_free(expr_str);
if (operand.expr->kind == Ast_BinaryExpr) {
ast_node(be, BinaryExpr, operand.expr);
if (be->op.kind != Token_CmpEq) {
break;
}
switch (be->left->tav.mode) {
case Addressing_Context:
case Addressing_Variable:
case Addressing_MapIndex:
case Addressing_SoaVariable:
{
gbString lhs = expr_to_string(be->left);
gbString rhs = expr_to_string(be->right);
error_line("\tSuggestion: Did you mean to do an assignment?\n", lhs, rhs);
error_line("\t '%s = %s;'\n", lhs, rhs);
gb_string_free(rhs);
gb_string_free(lhs);
}
break;
}
}
break;
}
}
check_expr_stmt(ctx, node);
case_end;
case_ast_node(as, AssignStmt, node);
switch (as->op.kind) {
case Token_Eq: {
// a, b, c = 1, 2, 3; // Multisided
isize lhs_count = as->lhs.count;
if (lhs_count == 0) {
error(as->op, "Missing lhs in assignment statement");
return;
}
TEMPORARY_ALLOCATOR_GUARD();
// NOTE(bill): If there is a bad syntax error, rhs > lhs which would mean there would need to be
// an extra allocation
auto lhs_operands = array_make<Operand>(temporary_allocator(), lhs_count);
auto rhs_operands = array_make<Operand>(temporary_allocator(), 0, 2*lhs_count);
for_array(i, as->lhs) {
if (is_blank_ident(as->lhs[i])) {
Operand *o = &lhs_operands[i];
o->expr = as->lhs[i];
o->mode = Addressing_Value;
} else {
ctx->assignment_lhs_hint = unparen_expr(as->lhs[i]);
check_expr(ctx, &lhs_operands[i], as->lhs[i]);
}
}
ctx->assignment_lhs_hint = nullptr; // Reset the assignment_lhs_hint
check_assignment_arguments(ctx, lhs_operands, &rhs_operands, as->rhs);
auto lhs_to_ignore = array_make<bool>(temporary_allocator(), lhs_count);
isize rhs_count = rhs_operands.count;
isize max = gb_min(lhs_count, rhs_count);
for (isize i = 0; i < max; i++) {
if (lhs_to_ignore[i]) {
continue;
}
check_assignment_variable(ctx, &lhs_operands[i], &rhs_operands[i]);
}
if (lhs_count != rhs_count) {
error(as->lhs[0], "Assignment count mismatch '%td' = '%td'", lhs_count, rhs_count);
}
break;
}
default: {
// a += 1; // Single-sided
Token op = as->op;
if (as->lhs.count != 1 || as->rhs.count != 1) {
error(op, "Assignment operation '%.*s' requires single-valued expressions", LIT(op.string));
return;
}
if (!gb_is_between(op.kind, Token__AssignOpBegin+1, Token__AssignOpEnd-1)) {
error(op, "Unknown Assignment operation '%.*s'", LIT(op.string));
return;
}
Operand lhs = {Addressing_Invalid};
Operand rhs = {Addressing_Invalid};
Ast *binary_expr = alloc_ast_node(node->file(), Ast_BinaryExpr);
ast_node(be, BinaryExpr, binary_expr);
be->op = op;
be->op.kind = cast(TokenKind)(cast(i32)be->op.kind - (Token_AddEq - Token_Add));
// NOTE(bill): Only use the first one will be used
be->left = as->lhs[0];
be->right = as->rhs[0];
check_expr(ctx, &lhs, as->lhs[0]);
check_binary_expr(ctx, &rhs, binary_expr, nullptr, true);
if (rhs.mode == Addressing_Invalid) {
return;
}
// NOTE(bill): Only use the first one will be used
check_assignment_variable(ctx, &lhs, &rhs);
break;
}
}
check_assign_stmt(ctx, node);
case_end;
case_ast_node(bs, BlockStmt, node);
@@ -2105,35 +2246,7 @@ gb_internal void check_stmt_internal(CheckerContext *ctx, Ast *node, u32 flags)
case_end;
case_ast_node(is, IfStmt, node);
check_open_scope(ctx, node);
check_label(ctx, is->label, node);
if (is->init != nullptr) {
check_stmt(ctx, is->init, 0);
}
Operand operand = {Addressing_Invalid};
check_expr(ctx, &operand, is->cond);
if (operand.mode != Addressing_Invalid && !is_type_boolean(operand.type)) {
error(is->cond, "Non-boolean condition in 'if' statement");
}
check_stmt(ctx, is->body, mod_flags);
if (is->else_stmt != nullptr) {
switch (is->else_stmt->kind) {
case Ast_IfStmt:
case Ast_BlockStmt:
check_stmt(ctx, is->else_stmt, mod_flags);
break;
default:
error(is->else_stmt, "Invalid 'else' statement in 'if' statement");
break;
}
}
check_close_scope(ctx);
check_if_stmt(ctx, node, mod_flags);
case_end;
case_ast_node(ws, WhenStmt, node);
@@ -2141,109 +2254,13 @@ gb_internal void check_stmt_internal(CheckerContext *ctx, Ast *node, u32 flags)
case_end;
case_ast_node(rs, ReturnStmt, node);
GB_ASSERT(ctx->curr_proc_sig != nullptr);
if (ctx->in_defer) {
error(rs->token, "'return' cannot be used within a defer statement");
break;
}
Type *proc_type = ctx->curr_proc_sig;
GB_ASSERT(proc_type != nullptr);
GB_ASSERT(proc_type->kind == Type_Proc);
TypeProc *pt = &proc_type->Proc;
if (pt->diverging) {
error(rs->token, "Diverging procedures may not return");
break;
}
Entity **result_entities = nullptr;
isize result_count = 0;
bool has_named_results = pt->has_named_results;
if (pt->results) {
result_entities = proc_type->Proc.results->Tuple.variables.data;
result_count = proc_type->Proc.results->Tuple.variables.count;
}
auto operands = array_make<Operand>(heap_allocator(), 0, 2*rs->results.count);
defer (array_free(&operands));
check_unpack_arguments(ctx, result_entities, result_count, &operands, rs->results, true, false);
if (result_count == 0 && rs->results.count > 0) {
error(rs->results[0], "No return values expected");
} else if (has_named_results && operands.count == 0) {
// Okay
} else if (operands.count != result_count) {
// Ignore error message as it has most likely already been reported
if (all_operands_valid(operands)) {
error(node, "Expected %td return values, got %td", result_count, operands.count);
}
} else {
for (isize i = 0; i < result_count; i++) {
Entity *e = pt->results->Tuple.variables[i];
Operand *o = &operands[i];
check_assignment(ctx, o, e->type, str_lit("return statement"));
if (is_type_untyped(o->type)) {
update_untyped_expr_type(ctx, o->expr, e->type, true);
}
// NOTE(bill): This is very basic escape analysis
// This needs to be improved tremendously, and a lot of it done during the
// middle-end (or LLVM side) to improve checks and error messages
Ast *expr = unparen_expr(o->expr);
if (expr->kind == Ast_UnaryExpr && expr->UnaryExpr.op.kind == Token_And) {
Ast *x = unparen_expr(expr->UnaryExpr.expr);
if (x->kind == Ast_CompoundLit) {
error(expr, "Cannot return the address to a stack value from a procedure");
} else if (x->kind == Ast_IndexExpr) {
Ast *array = x->IndexExpr.expr;
if (is_type_array_like(type_of_expr(array)) && check_expr_is_stack_variable(array)) {
gbString t = type_to_string(type_of_expr(array));
error(expr, "Cannot return the address to an element of stack variable from a procedure, of type %s", t);
gb_string_free(t);
}
} else {
if (check_expr_is_stack_variable(x)) {
error(expr, "Cannot return the address to a stack variable from a procedure");
}
}
}
}
}
check_return_stmt(ctx, node);
case_end;
case_ast_node(fs, ForStmt, node);
u32 new_flags = mod_flags | Stmt_BreakAllowed | Stmt_ContinueAllowed;
check_open_scope(ctx, node);
check_label(ctx, fs->label, node); // TODO(bill): What should the label's "scope" be?
if (fs->init != nullptr) {
check_stmt(ctx, fs->init, 0);
}
if (fs->cond != nullptr) {
Operand o = {Addressing_Invalid};
check_expr(ctx, &o, fs->cond);
if (o.mode != Addressing_Invalid && !is_type_boolean(o.type)) {
error(fs->cond, "Non-boolean condition in 'for' statement");
}
}
if (fs->post != nullptr) {
check_stmt(ctx, fs->post, 0);
if (fs->post->kind != Ast_AssignStmt) {
error(fs->post, "'for' statement post statement must be a simple statement");
}
}
check_stmt(ctx, fs->body, new_flags);
check_close_scope(ctx);
check_for_stmt(ctx, node, mod_flags);
case_end;
case_ast_node(rs, RangeStmt, node);
check_range_stmt(ctx, node, mod_flags);
case_end;