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f513b6237feabcdf7fa5095f5f58d39b9845f653
c3c/src/compiler/parse_expr.c
Christoffer Lerno f513b6237f Improved error messages for foo(void), foo(int!) declarations.
2022-08-11 12:59:55 +02:00

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// Copyright (c) 2020 Christoffer Lerno. All rights reserved.
// Use of this source code is governed by a LGPLv3.0
// a copy of which can be found in the LICENSE file.
#include "compiler_internal.h"
#include "parser_internal.h"
#define IF_TRY_CATCH_PREC (PREC_AND + 1)
typedef Expr *(*ParseFn)(ParseContext *context, Expr *);
typedef struct
{
ParseFn prefix;
ParseFn infix;
Precedence precedence;
} ParseRule;
extern ParseRule rules[TOKEN_EOF + 1];
inline Expr *parse_precedence_with_left_side(ParseContext *c, Expr *left_side, Precedence precedence)
{
while (1)
{
TokenType tok = c->tok;
Precedence token_precedence = rules[tok].precedence;
if (precedence > token_precedence) break;
if (!expr_ok(left_side)) return left_side;
ParseFn infix_rule = rules[tok].infix;
if (!infix_rule)
{
SEMA_ERROR_HERE("An expression was expected.");
return poisoned_expr;
}
left_side = infix_rule(c, left_side);
}
return left_side;
}
static Expr *parse_precedence(ParseContext *c, Precedence precedence)
{
// Get the rule for the previous token.
ParseFn prefix_rule = rules[c->tok].prefix;
if (prefix_rule == NULL)
{
SEMA_ERROR_HERE("An expression was expected.");
return poisoned_expr;
}
Expr *left_side = prefix_rule(c, NULL);
if (!expr_ok(left_side)) return left_side;
return parse_precedence_with_left_side(c, left_side, precedence);
}
Expr *parse_expr_or_initializer_list(ParseContext *c)
{
return parse_expr(c);
}
static inline bool next_is_try_unwrap(ParseContext *c)
{
return tok_is(c, TOKEN_TRY) && peek(c) != TOKEN_LPAREN;
}
static inline bool next_is_catch_unwrap(ParseContext *c)
{
return tok_is(c, TOKEN_CATCH) && peek(c) != TOKEN_LPAREN;
}
static inline Expr *parse_for_try_expr(ParseContext *c)
{
return parse_precedence(c, PREC_AND + 1);
}
/**
* catch_unwrap ::= CATCH IDENT | (type? IDENT '=' (expr | '(' expr (',' expr) ')'))
*/
static inline Expr *parse_catch_unwrap(ParseContext *c)
{
Expr *expr = expr_new(EXPR_CATCH_UNWRAP, c->span);
advance_and_verify(c, TOKEN_CATCH);
TypeInfo *type = NULL;
ASSIGN_EXPR_OR_RET(Expr * lhs, parse_precedence(c, IF_TRY_CATCH_PREC), poisoned_expr);
if (lhs->expr_kind == EXPR_TYPEINFO)
{
expr->catch_unwrap_expr.type = lhs->type_expr;
ASSIGN_EXPR_OR_RET(expr->catch_unwrap_expr.variable, parse_precedence(c, IF_TRY_CATCH_PREC), poisoned_expr);
}
else
{
expr->catch_unwrap_expr.type = NULL;
expr->catch_unwrap_expr.variable = lhs;
}
if (!try_consume(c, TOKEN_EQ))
{
if (expr->catch_unwrap_expr.type)
{
SEMA_ERROR_HERE("Expected a '=' here.");
return poisoned_expr;
}
vec_add(expr->catch_unwrap_expr.exprs, expr->catch_unwrap_expr.variable);
expr->catch_unwrap_expr.variable = NULL;
RANGE_EXTEND_PREV(expr);
return expr;
}
if (try_consume(c, TOKEN_LPAREN))
{
do
{
ASSIGN_EXPR_OR_RET(Expr * init_expr, parse_expr(c), poisoned_expr);
vec_add(expr->catch_unwrap_expr.exprs, init_expr);
} while (try_consume(c, TOKEN_COMMA));
CONSUME_OR_RET(TOKEN_RPAREN, poisoned_expr);
}
else
{
ASSIGN_EXPR_OR_RET(Expr * init_expr, parse_expr(c), poisoned_expr);
vec_add(expr->catch_unwrap_expr.exprs, init_expr);
}
RANGE_EXTEND_PREV(expr);
return expr;
}
/**
* try_unwrap ::= TRY (IDENT | type? IDENT '=' non_and_expr)
*/
static inline Expr *parse_try_unwrap(ParseContext *c)
{
Expr *expr = EXPR_NEW_TOKEN(EXPR_TRY_UNWRAP);
advance_and_verify(c, TOKEN_TRY);
ASSIGN_EXPR_OR_RET(Expr *lhs, parse_precedence(c, IF_TRY_CATCH_PREC), poisoned_expr);
if (lhs->expr_kind == EXPR_TYPEINFO)
{
expr->try_unwrap_expr.type = lhs->type_expr;
ASSIGN_EXPR_OR_RET(expr->try_unwrap_expr.variable, parse_precedence(c, IF_TRY_CATCH_PREC), poisoned_expr);
}
else
{
expr->try_unwrap_expr.variable = lhs;
}
if (lhs->expr_kind == EXPR_TYPEINFO && expr->try_unwrap_expr.variable->expr_kind != EXPR_IDENTIFIER)
{
SEMA_ERROR(expr->try_unwrap_expr.variable, "A new variable was expected.");
return poisoned_expr;
}
if (try_consume(c, TOKEN_EQ))
{
ASSIGN_EXPR_OR_RET(expr->try_unwrap_expr.init, parse_precedence(c, PREC_AND + 1), poisoned_expr);
}
RANGE_EXTEND_PREV(expr);
return expr;
}
/**
* try_unwrap_chain ::= try_unwrap ('&&' (try_unwrap | non_and_expr))*
* try_unwrap ::= TRY (IDENT | type? IDENT '=' non_and_expr)
*/
static inline Expr *parse_try_unwrap_chain(ParseContext *c)
{
Expr **unwraps = NULL;
ASSIGN_EXPR_OR_RET(Expr * first_unwrap , parse_try_unwrap(c), poisoned_expr);
vec_add(unwraps, first_unwrap);
while (try_consume(c, TOKEN_AND))
{
if (next_is_try_unwrap(c))
{
ASSIGN_EXPR_OR_RET(Expr * expr, parse_try_unwrap(c), poisoned_expr);
vec_add(unwraps, expr);
continue;
}
ASSIGN_EXPR_OR_RET(Expr * next_unwrap, parse_for_try_expr(c), poisoned_expr);
vec_add(unwraps, next_unwrap);
}
Expr *try_unwrap_chain = expr_new_expr(EXPR_TRY_UNWRAP_CHAIN, first_unwrap);
try_unwrap_chain->try_unwrap_chain_expr = unwraps;
RANGE_EXTEND_PREV(try_unwrap_chain);
return try_unwrap_chain;
}
Expr *parse_assert_expr(ParseContext *c)
{
if (next_is_try_unwrap(c))
{
return parse_try_unwrap_chain(c);
}
return parse_expr(c);
}
/**
* cond_list ::= ((expr | decl-expr) COMMA)* (expr | decl-expr | try_unwrap_chain | catch_unwrap )
*
* @return bool
*/
Expr *parse_cond(ParseContext *c)
{
Expr *decl_expr = EXPR_NEW_TOKEN(EXPR_COND);
decl_expr->cond_expr = NULL;
while (1)
{
if (next_is_try_unwrap(c))
{
ASSIGN_EXPR_OR_RET(Expr * try_unwrap, parse_try_unwrap_chain(c), poisoned_expr);
vec_add(decl_expr->cond_expr, try_unwrap);
if (tok_is(c, TOKEN_COMMA))
{
SEMA_ERROR(try_unwrap, "The 'try' must be placed last, can you change it?");
return poisoned_expr;
}
break;
}
if (next_is_catch_unwrap(c))
{
ASSIGN_EXPR_OR_RET(Expr * catch_unwrap, parse_catch_unwrap(c), poisoned_expr);
vec_add(decl_expr->cond_expr, catch_unwrap);
if (tok_is(c, TOKEN_COMMA))
{
SEMA_ERROR(catch_unwrap, "The 'catch' must be placed last, can you change it?");
return poisoned_expr;
}
break;
}
Decl *decl;
ASSIGN_EXPR_OR_RET(Expr * expr, parse_decl_or_expr(c, &decl), poisoned_expr);
if (!expr)
{
expr = expr_new(EXPR_DECL, decl->span);
expr->decl_expr = decl;
}
vec_add(decl_expr->cond_expr, expr);
if (!try_consume(c, TOKEN_COMMA)) break;
}
RANGE_EXTEND_PREV(decl_expr);
return decl_expr;
}
// These used to be explicitly inlined, but that seems to lead to confusing MSVC linker errors.
// They are probably still inlined by the compiler, though I haven't checked.
Expr* parse_expr(ParseContext *c)
{
return parse_precedence(c, PREC_ASSIGNMENT);
}
Expr* parse_constant_expr(ParseContext *c)
{
return parse_precedence(c, PREC_TERNARY);
}
/**
* param_path : ('[' expression ']' | '.' IDENT)*
*
* @param c
* @param path reference to the path to return
* @return true if parsing succeeds, false otherwise.
*/
static bool parse_param_path(ParseContext *c, DesignatorElement ***path)
{
*path = NULL;
while (true)
{
if (tok_is(c, TOKEN_LBRACKET))
{
// Parse the inside of [ ]
DesignatorElement *element = CALLOCS(DesignatorElement);
element->kind = DESIGNATOR_ARRAY;
advance_and_verify(c, TOKEN_LBRACKET);
ASSIGN_EXPR_OR_RET(element->index_expr, parse_expr(c), false);
// Possible range
if (try_consume(c, TOKEN_DOTDOT))
{
ASSIGN_EXPR_OR_RET(element->index_end_expr, parse_expr(c), false);
element->kind = DESIGNATOR_RANGE;
}
CONSUME_OR_RET(TOKEN_RBRACKET, false);
// Include right bracket in the expr
vec_add(*path, element);
continue;
}
if (tok_is(c, TOKEN_DOT))
{
advance(c);
DesignatorElement *element = CALLOCS(DesignatorElement);
element->kind = DESIGNATOR_FIELD;
element->field = symstr(c);
EXPECT_OR_RET(TOKEN_IDENT, false);
advance(c);
vec_add(*path, element);
continue;
}
return true;
}
}
/**
* param_list ::= ('...' parameter | parameter (',' parameter)*)?
*
* parameter ::= (param_path '=')? expr
*/
bool parse_arg_list(ParseContext *c, Expr ***result, TokenType param_end, bool *unsplat)
{
*result = NULL;
if (unsplat) *unsplat = false;
while (1)
{
Expr *expr = NULL;
DesignatorElement **path;
SourceSpan start_span = c->span;
if (!parse_param_path(c, &path)) return false;
if (path != NULL)
{
// Create the parameter expr
expr = expr_new(EXPR_DESIGNATOR, start_span);
expr->designator_expr.path = path;
// Expect the '=' after.
CONSUME_OR_RET(TOKEN_EQ, false);
// Now parse the rest
ASSIGN_EXPR_OR_RET(expr->designator_expr.value, parse_expr_or_initializer_list(c), false);
RANGE_EXTEND_PREV(expr);
}
else
{
if (unsplat)
{
*unsplat = try_consume(c, TOKEN_ELLIPSIS);
}
ASSIGN_EXPR_OR_RET(expr, parse_expr_or_initializer_list(c), false);
}
vec_add(*result, expr);
if (!try_consume(c, TOKEN_COMMA))
{
return true;
}
if (tok_is(c, param_end)) return true;
if (unsplat && *unsplat)
{
SEMA_ERROR_HERE("'...' is only allowed on the last argument in a call.");
return false;
}
}
}
/**
* expression_list
* : expression
* | expression_list ',' expression
* ;
* @return Ast *
*/
Expr *parse_expression_list(ParseContext *c, bool allow_decl)
{
Expr *expr_list = EXPR_NEW_TOKEN(EXPR_EXPRESSION_LIST);
while (1)
{
Decl *decl;
ASSIGN_EXPR_OR_RET(Expr * expr, parse_decl_or_expr(c, &decl), poisoned_expr);
if (!expr)
{
if (!allow_decl)
{
SEMA_ERROR_HERE("This looks like a declaration, which isn't allowed here.");
return poisoned_expr;
}
expr = expr_new(EXPR_DECL, decl->span);
expr->decl_expr = decl;
}
vec_add(expr_list->expression_list, expr);
if (!try_consume(c, TOKEN_COMMA)) break;
}
return expr_list;
}
Expr *parse_ct_expression_list(ParseContext *c, bool allow_decl)
{
Expr *expr_list = EXPR_NEW_TOKEN(EXPR_EXPRESSION_LIST);
while (1)
{
Expr *expr;
if (tok_is(c, TOKEN_VAR))
{
ASSIGN_DECL_OR_RET(Decl *decl, parse_var_decl(c), poisoned_expr);
if (!allow_decl)
{
SEMA_ERROR_HERE("This looks like a declaration, which isn't allowed here.");
return poisoned_expr;
}
expr = expr_new(EXPR_DECL, decl->span);
expr->decl_expr = decl;
}
else
{
ASSIGN_EXPR_OR_RET(expr, parse_expr(c), poisoned_expr);
}
vec_add(expr_list->expression_list, expr);
if (!try_consume(c, TOKEN_COMMA)) break;
}
return expr_list;
}
/**
* @param left must be null.
* @return Expr*
*/
static Expr *parse_type_identifier(ParseContext *context, Expr *left)
{
assert(!left && "Unexpected left hand side");
return parse_type_expression_with_path(context, NULL);
}
static Expr *parse_type_expr(ParseContext *c, Expr *left)
{
assert(!left && "Unexpected left hand side");
Expr *expr = EXPR_NEW_TOKEN(EXPR_TYPEINFO);
ASSIGN_TYPE_OR_RET(TypeInfo *type, parse_type(c), poisoned_expr);
expr->span = type->span;
expr->type_expr = type;
if (tok_is(c, TOKEN_SCOPE))
{
SEMA_ERROR_HERE("A type is never followed by '::', did you mean '.'?");
return poisoned_expr;
}
return expr;
}
static Expr *parse_ct_stringify(ParseContext *c, Expr *left)
{
assert(!left && "Unexpected left hand side");
SourceSpan start_span = c->span;
advance(c);
CONSUME_OR_RET(TOKEN_LPAREN, poisoned_expr);
const char *start = c->lexer.current;
ASSIGN_EXPR_OR_RET(Expr *inner, parse_expr(c), poisoned_expr);
const char *end = c->lexer.current;
CONSUME_OR_RET(TOKEN_RPAREN, poisoned_expr);
if (inner->expr_kind == EXPR_HASH_IDENT)
{
Expr *expr = expr_new(EXPR_STRINGIFY, start_span);
expr->inner_expr = inner;
RANGE_EXTEND_PREV(expr);
return expr;
}
size_t len = end - start;
const char *content = str_copy(start, len);
Expr *expr = expr_new(EXPR_CONST, start_span);
expr->const_expr.const_kind = CONST_STRING;
expr->const_expr.string.chars = content;
expr->const_expr.string.len = len;
return expr;
}
static Expr *parse_unary_expr(ParseContext *c, Expr *left)
{
assert(!left && "Did not expect a left hand side!");
Expr *unary = EXPR_NEW_TOKEN(EXPR_UNARY);
unary->unary_expr.operator = unaryop_from_token(c->tok);
advance(c);
Expr *right_side = parse_precedence(c, PREC_UNARY);
CHECK_EXPR_OR_RET(right_side);
unary->unary_expr.expr = right_side;
RANGE_EXTEND_PREV(unary);
return unary;
}
static Expr *parse_post_unary(ParseContext *c, Expr *left)
{
assert(expr_ok(left));
Expr *unary = expr_new_expr(EXPR_POST_UNARY, left);
unary->unary_expr.expr = left;
unary->unary_expr.operator = unaryop_from_token(c->tok);
advance(c);
RANGE_EXTEND_PREV(unary);
return unary;
}
static Expr *parse_ternary_expr(ParseContext *c, Expr *left_side)
{
assert(expr_ok(left_side));
Expr *expr_ternary = expr_new_expr(EXPR_TERNARY, left_side);
expr_ternary->ternary_expr.cond = exprid(left_side);
// Check for elvis
if (try_consume(c, TOKEN_ELVIS))
{
expr_ternary->ternary_expr.then_expr = 0;
}
else
{
advance_and_verify(c, TOKEN_QUESTION);
if (!rules[c->tok].prefix)
{
expr_ternary->expr_kind = EXPR_RETHROW;
expr_ternary->rethrow_expr.inner = left_side;
RANGE_EXTEND_PREV(expr_ternary);
return expr_ternary;
}
ASSIGN_EXPR_OR_RET(Expr * true_expr, parse_expr(c), poisoned_expr);
expr_ternary->ternary_expr.then_expr = exprid(true_expr);
CONSUME_OR_RET(TOKEN_COLON, poisoned_expr);
}
ASSIGN_EXPRID_OR_RET(expr_ternary->ternary_expr.else_expr, parse_precedence(c, PREC_TERNARY), poisoned_expr);
RANGE_EXTEND_PREV(expr_ternary);
return expr_ternary;
}
/**
* grouping_expr
* : '(' expression ')' ('(' expression ')')?
* ;
*/
static Expr *parse_grouping_expr(ParseContext *c, Expr *left)
{
assert(!left && "Unexpected left hand side");
Expr *expr = EXPR_NEW_TOKEN(EXPR_GROUP);
advance_and_verify(c, TOKEN_LPAREN);
ASSIGN_EXPR_OR_RET(expr->inner_expr, parse_expr(c), poisoned_expr);
CONSUME_OR_RET(TOKEN_RPAREN, poisoned_expr);
// Look at what follows.
if (expr->inner_expr->expr_kind == EXPR_TYPEINFO)
{
TypeInfo *info = expr->inner_expr->type_expr;
if (tok_is(c, TOKEN_LBRACE) && info->resolve_status != RESOLVE_DONE)
{
SEMA_ERROR_HERE("Unexpected start of a block '{' here. If you intended a compound literal, remove the () around the type.");
return poisoned_expr;
}
if (rules[c->tok].prefix)
{
ASSIGN_EXPRID_OR_RET(expr->cast_expr.expr, parse_precedence(c, PREC_CALL), poisoned_expr);
expr->expr_kind = EXPR_CAST;
expr->cast_expr.type_info = type_infoid(info);
}
}
RANGE_EXTEND_PREV(expr);
return expr;
}
/**
* initializer_list
* : '{' initializer_values '}'
* | '{' initializer_values ',' '}'
* ;
*
* initializer_values
* : initializer
* | initializer_values ',' initializer
* ;
*
* @param elements
* @return
*/
Expr *parse_initializer_list(ParseContext *c, Expr *left)
{
assert(!left && "Unexpected left hand side");
Expr *initializer_list = EXPR_NEW_TOKEN(EXPR_INITIALIZER_LIST);
advance_and_verify(c, TOKEN_LBRACE);
if (!try_consume(c, TOKEN_RBRACE))
{
Expr **exprs = NULL;
if (!parse_arg_list(c, &exprs, TOKEN_RBRACE, NULL)) return poisoned_expr;
int designated = -1;
VECEACH(exprs, i)
{
Expr *expr = exprs[i];
if (expr->expr_kind == EXPR_DESIGNATOR)
{
if (designated == 0)
{
SEMA_ERROR(expr, "Designated initialization with '[] = ...' and '.param = ...' cannot be mixed with normal initialization.");
return poisoned_expr;
}
designated = 1;
continue;
}
if (designated == 1)
{
SEMA_ERROR(expr, "Normal initialization cannot be mixed with designated initialization.");
return poisoned_expr;
}
designated = 0;
}
CONSUME_OR_RET(TOKEN_RBRACE, poisoned_expr);
RANGE_EXTEND_PREV(initializer_list);
if (designated == 1)
{
initializer_list->designated_init_list = exprs;
initializer_list->expr_kind = EXPR_DESIGNATED_INITIALIZER_LIST;
}
else
{
initializer_list->initializer_list = exprs;
}
}
RANGE_EXTEND_PREV(initializer_list);
return initializer_list;
}
static Expr *parse_failable(ParseContext *c, Expr *left_side)
{
Expr *failable = expr_new(EXPR_FAILABLE, left_side->span);
advance_and_verify(c, TOKEN_BANG);
failable->inner_expr = left_side;
RANGE_EXTEND_PREV(failable);
return failable;
}
static Expr *parse_binary(ParseContext *c, Expr *left_side)
{
assert(left_side && expr_ok(left_side));
// Remember the operator.
TokenType operator_type = c->tok;
advance(c);
Expr *right_side;
// Assignment operators have precedence right -> left.
if (rules[operator_type].precedence == PREC_ASSIGNMENT)
{
ASSIGN_EXPR_OR_RET(right_side, parse_precedence(c, PREC_ASSIGNMENT), poisoned_expr);
}
else
{
ASSIGN_EXPR_OR_RET(right_side, parse_precedence(c, rules[operator_type].precedence + 1), poisoned_expr);
}
Expr *expr = expr_new_expr(EXPR_BINARY, left_side);
expr->binary_expr.operator = binaryop_from_token(operator_type);
expr->binary_expr.left = exprid(left_side);
expr->binary_expr.right = exprid(right_side);
RANGE_EXTEND_PREV(expr);
return expr;
}
static Expr *parse_call_expr(ParseContext *c, Expr *left)
{
assert(left && expr_ok(left));
Expr **params = NULL;
advance_and_verify(c, TOKEN_LPAREN);
bool unsplat = false;
Decl **body_args = NULL;
if (!tok_is(c, TOKEN_RPAREN))
{
// Pick a modest guess.
params = VECNEW(Expr*, 4);
if (!parse_arg_list(c, &params, TOKEN_RPAREN, &unsplat)) return poisoned_expr;
}
if (try_consume(c, TOKEN_EOS) && !tok_is(c, TOKEN_RPAREN))
{
if (!parse_next_may_be_type_or_ident(c))
{
SEMA_ERROR_LAST("Expected an ending ')'. Did you forget a ')' before this ';'?");
return poisoned_expr;
}
if (!parse_parameters(c, VISIBLE_LOCAL, &body_args)) return poisoned_expr;
}
if (!tok_is(c, TOKEN_RPAREN))
{
SEMA_ERROR_LAST("Expected the ending ')' here.");
return poisoned_expr;
}
advance(c);
Expr *call = expr_new_expr(EXPR_CALL, left);
call->call_expr.function = exprid(left);
call->call_expr.arguments = params;
call->call_expr.unsplat_last = unsplat;
call->call_expr.body_arguments = body_args;
RANGE_EXTEND_PREV(call);
if (body_args && !tok_is(c, TOKEN_LBRACE))
{
SEMA_ERROR_HERE("Expected a macro body here.");
return poisoned_expr;
}
if (tok_is(c, TOKEN_LBRACE))
{
ASSIGN_ASTID_OR_RET(call->call_expr.body, parse_compound_stmt(c), poisoned_expr);
}
Attr *attr;
int force_inline = -1;
while (1)
{
if (!parse_attribute(c, &attr)) return poisoned_expr;
if (!attr) break;
AttributeType attr_type = attribute_by_name(attr->name);
int new_inline = attr_type == ATTRIBUTE_INLINE;
switch (attr_type)
{
case ATTRIBUTE_PURE:
if (call->call_expr.attr_pure)
{
SEMA_ERROR(attr, "Repeat of the same attribute is not allowed.");
return poisoned_expr;
}
call->call_expr.attr_pure = true;
continue;
case ATTRIBUTE_INLINE:
case ATTRIBUTE_NOINLINE:
if (force_inline == new_inline)
{
SEMA_ERROR(attr, "Repeat of the same attribute is not allowed.");
return poisoned_expr;
}
if (force_inline != -1)
{
SEMA_ERROR(attr, "@inline and @noinline cannot be combined");
return poisoned_expr;
}
force_inline = new_inline;
continue;
default:
SEMA_ERROR(attr, "Only '@pure', '@inline' and '@noinline' are valid attributes for calls.");
return poisoned_expr;
}
}
if (force_inline != -1)
{
call->call_expr.attr_force_inline = force_inline == 1;
call->call_expr.attr_force_noinline = force_inline == 0;
}
return call;
}
static Expr *parse_subscript_expr(ParseContext *c, Expr *left)
{
assert(left && expr_ok(left));
advance_and_verify(c, TOKEN_LBRACKET);
Expr *subs_expr = expr_new_expr(EXPR_SUBSCRIPT, left);
Expr *index = NULL;
bool is_range = false;
bool from_back = false;
bool end_from_back = false;
Expr *end = NULL;
// Not range with missing entry
if (!tok_is(c, TOKEN_DOTDOT) && !tok_is(c, TOKEN_COLON))
{
// Might be ^ prefix
from_back = try_consume(c, TOKEN_BIT_XOR);
ASSIGN_EXPR_OR_RET(index, parse_expr(c), poisoned_expr);
}
else
{
index = EXPR_NEW_TOKEN(EXPR_CONST);
index->type = type_uint;
index->resolve_status = RESOLVE_DONE;
expr_const_set_int(&index->const_expr, 0, type_uint->type_kind);
}
bool is_len_range = try_consume(c, TOKEN_COLON);
if (is_len_range || try_consume(c, TOKEN_DOTDOT))
{
is_range = true;
if (!tok_is(c, TOKEN_RBRACKET))
{
end_from_back = try_consume(c, TOKEN_BIT_XOR);
ASSIGN_EXPR_OR_RET(end, parse_expr(c), poisoned_expr);
}
}
CONSUME_OR_RET(TOKEN_RBRACKET, poisoned_expr);
RANGE_EXTEND_PREV(subs_expr);
if (is_range)
{
subs_expr->expr_kind = EXPR_SLICE;
subs_expr->slice_expr.expr = exprid(left);
subs_expr->slice_expr.start = exprid(index);
subs_expr->slice_expr.start_from_back = from_back;
subs_expr->slice_expr.end = end ? exprid(end) : 0;
subs_expr->slice_expr.end_from_back = end_from_back;
subs_expr->slice_expr.is_lenrange = is_len_range;
}
else
{
subs_expr->subscript_expr.expr = exprid(left);
subs_expr->subscript_expr.index = exprid(index);
subs_expr->subscript_expr.from_back = from_back;
}
return subs_expr;
}
static Expr *parse_access_expr(ParseContext *c, Expr *left)
{
assert(left && expr_ok(left));
advance_and_verify(c, TOKEN_DOT);
Expr *access_expr = expr_new_expr(EXPR_ACCESS, left);
access_expr->access_expr.parent = left;
ASSIGN_EXPR_OR_RET(access_expr->access_expr.child, parse_precedence(c, PREC_CALL + 1), poisoned_expr);
RANGE_EXTEND_PREV(access_expr);
return access_expr;
}
static Expr *parse_ct_ident(ParseContext *c, Expr *left)
{
assert(!left && "Unexpected left hand side");
if (try_consume(c, TOKEN_CT_CONST_IDENT))
{
SEMA_ERROR_LAST("Compile time identifiers may not be constants.");
return poisoned_expr;
}
Expr *expr = EXPR_NEW_TOKEN(EXPR_CT_IDENT);
expr->ct_ident_expr.identifier = symstr(c);
advance(c);
return expr;
}
static Expr *parse_hash_ident(ParseContext *c, Expr *left)
{
assert(!left && "Unexpected left hand side");
Expr *expr = EXPR_NEW_TOKEN(EXPR_HASH_IDENT);
expr->ct_ident_expr.identifier = symstr(c);
advance(c);
return expr;
}
static Expr *parse_ct_eval(ParseContext *c, Expr *left)
{
assert(!left && "Unexpected left hand side");
Expr *expr = EXPR_NEW_TOKEN(EXPR_CT_EVAL);
advance(c);
CONSUME_OR_RET(TOKEN_LPAREN, poisoned_expr);
ASSIGN_EXPR_OR_RET(expr->inner_expr, parse_expr(c), poisoned_expr);
CONSUME_OR_RET(TOKEN_RPAREN, poisoned_expr);
RANGE_EXTEND_PREV(expr);
return expr;
}
static Expr *parse_ct_sizeof(ParseContext *c, Expr *left)
{
assert(!left && "Unexpected left hand side");
Expr *access = expr_new(EXPR_ACCESS, c->span);
advance(c);
CONSUME_OR_RET(TOKEN_LPAREN, poisoned_expr);
ASSIGN_EXPR_OR_RET(Expr *inner, parse_expr(c), poisoned_expr);
CONSUME_OR_RET(TOKEN_RPAREN, poisoned_expr);
Expr *typeof_expr = expr_new(EXPR_TYPEINFO, inner->span);
TypeInfo *type_info = type_info_new(TYPE_INFO_EXPRESSION, inner->span);
type_info->unresolved_type_expr = inner;
typeof_expr->type_expr = type_info;
access->access_expr.parent = typeof_expr;
Expr *ident = expr_new(EXPR_IDENTIFIER, c->span);
ident->identifier_expr.ident = kw_sizeof;
access->access_expr.child = ident;
RANGE_EXTEND_PREV(access);
return access;
}
static Expr *parse_ct_call(ParseContext *c, Expr *left)
{
assert(!left && "Unexpected left hand side");
Expr *expr = EXPR_NEW_TOKEN(EXPR_CT_CALL);
expr->ct_call_expr.token_type = c->tok;
advance(c);
CONSUME_OR_RET(TOKEN_LPAREN, poisoned_expr);
ASSIGN_EXPR_OR_RET(Expr* internal, parse_precedence(c, PREC_FIRST + 1), poisoned_expr);
ExprFlatElement *flat_path = NULL;
TokenType tok = c->tok;
if (tok == TOKEN_DOT || tok == TOKEN_LBRACKET)
{
while (1)
{
ExprFlatElement flat_element;
if (try_consume(c, TOKEN_LBRACKET))
{
ASSIGN_EXPR_OR_RET(flat_element.inner, parse_expr(c), poisoned_expr);
TRY_CONSUME_OR_RET(TOKEN_RBRACKET, "Expected a ']' after the index.", poisoned_expr);
flat_element.array = true;
}
else if (try_consume(c, TOKEN_DOT))
{
ASSIGN_EXPR_OR_RET(flat_element.inner, parse_precedence(c, PREC_FIRST), poisoned_expr);
flat_element.array = false;
}
else
{
SEMA_ERROR_HERE("Expected '.' or '[' here.");
return poisoned_expr;
}
vec_add(flat_path, flat_element);
if (tok_is(c, TOKEN_RPAREN)) break;
}
RANGE_EXTEND_PREV(internal);
}
expr->ct_call_expr.main_var = internal;
expr->ct_call_expr.flat_path = flat_path;
CONSUME_OR_RET(TOKEN_RPAREN, poisoned_expr);
RANGE_EXTEND_PREV(expr);
return expr;
}
static Expr *parse_ct_conv(ParseContext *c, Expr *left)
{
assert(!left && "Unexpected left hand side");
Expr *expr = EXPR_NEW_TOKEN(EXPR_CT_CONV);
expr->ct_call_expr.token_type = c->tok;
advance(c);
CONSUME_OR_RET(TOKEN_LPAREN, poisoned_expr);
ASSIGN_TYPEID_OR_RET(expr->ct_call_expr.type_from, parse_type(c), poisoned_expr);
TRY_CONSUME_AFTER(TOKEN_COMMA, "Expected ',' here.", poisoned_expr);
ASSIGN_TYPEID_OR_RET(expr->ct_call_expr.type_to, parse_type(c), poisoned_expr);
TRY_CONSUME_AFTER(TOKEN_RPAREN, "Expected ')' here.", poisoned_expr);
RANGE_EXTEND_PREV(expr);
return expr;
}
static Expr *parse_identifier(ParseContext *c, Expr *left)
{
assert(!left && "Unexpected left hand side");
if (symstr(c) == kw_return)
{
Expr *expr = EXPR_NEW_TOKEN(EXPR_RETVAL);
advance(c);
return expr;
}
Expr *expr = EXPR_NEW_TOKEN(EXPR_IDENTIFIER);
expr->identifier_expr.ident = symstr(c);
expr->identifier_expr.is_const = tok_is(c, TOKEN_CONST_IDENT);
advance(c);
return expr;
}
static Expr *parse_identifier_starting_expression(ParseContext *c, Expr *left)
{
assert(!left && "Unexpected left hand side");
bool had_error;
Path *path = parse_path_prefix(c, &had_error);
if (had_error) return poisoned_expr;
switch (c->tok)
{
case TOKEN_IDENT:
case TOKEN_CONST_IDENT:
case TOKEN_AT_IDENT:
{
Expr *expr = parse_identifier(c, NULL);
expr->identifier_expr.path = path;
return expr;
}
case TOKEN_TYPE_IDENT:
return parse_type_expression_with_path(c, path);
default:
SEMA_ERROR_HERE("Expected a type, function or constant.");
return poisoned_expr;
}
}
static Expr *parse_try_expr(ParseContext *c, Expr *left)
{
assert(!left && "Unexpected left hand side");
bool is_try = tok_is(c, TOKEN_TRY);
Expr *try_expr = EXPR_NEW_TOKEN(is_try ? EXPR_TRY : EXPR_CATCH);
advance(c);
if (!try_consume(c, TOKEN_LPAREN))
{
if (is_try)
{
SEMA_ERROR(try_expr, "An unwrapping 'try' can only occur as the last element of a conditional, did you want 'try(expr)'?");
return poisoned_expr;
}
else
{
SEMA_ERROR(try_expr, "An unwrapping 'catch' can only occur as the last element of a conditional, did you want 'catch(expr)'?");
return poisoned_expr;
}
}
ASSIGN_EXPR_OR_RET(try_expr->inner_expr, parse_expr(c), poisoned_expr);
CONSUME_OR_RET(TOKEN_RPAREN, poisoned_expr);
RANGE_EXTEND_PREV(try_expr);
return try_expr;
}
static Expr *parse_force_unwrap_expr(ParseContext *c, Expr *left)
{
Expr *force_unwrap_expr = expr_new_expr(EXPR_FORCE_UNWRAP, left);
advance(c);
force_unwrap_expr->inner_expr = left;
RANGE_EXTEND_PREV(force_unwrap_expr);
return force_unwrap_expr;
}
static Expr *parse_builtin(ParseContext *c, Expr *left)
{
assert(!left && "Had left hand side");
Expr *expr = EXPR_NEW_TOKEN(EXPR_BUILTIN);
advance_and_verify(c, TOKEN_BUILTIN);
if (!token_is_some_ident(c->tok))
{
SEMA_ERROR_HERE("Expected a name here.");
return poisoned_expr;
}
expr->builtin_expr.ident = symstr(c);
if (try_consume(c, TOKEN_CONST_IDENT))
{
expr->expr_kind = EXPR_COMPILER_CONST;
}
else
{
CONSUME_OR_RET(TOKEN_IDENT, poisoned_expr);
}
RANGE_EXTEND_PREV(expr);
return expr;
}
static int read_num_type(const char *string, size_t loc, size_t len)
{
int i = 0;
loc++;
if (string[loc] == '0') return -1;
for (size_t z = loc; z < len; z++)
{
i *= 10;
if (i > 1024) return i;
i += string[z] - '0';
}
return i;
}
static Expr *parse_integer(ParseContext *c, Expr *left)
{
assert(!left && "Had left hand side");
Expr *expr_int = EXPR_NEW_TOKEN(EXPR_CONST);
size_t len = c->data.lex_len;
const char *string = symstr(c);
Int128 i = { 0, 0 };
bool is_unsigned = false;
int type_bits = 0;
int hex_characters = 0;
int oct_characters = 0;
int binary_characters = 0;
bool wrapped = false;
uint64_t max;
switch (len > 2 ? string[1] : '0')
{
case 'x':
is_unsigned = true;
max = UINT64_MAX >> 4;
for (size_t loc = 2; loc < len; loc++)
{
char ch = string[loc];
if (ch == 'u' || ch == 'U')
{
type_bits = read_num_type(string, loc, len);
break;
}
if (ch == 'i' || ch == 'I')
{
is_unsigned = false;
type_bits = read_num_type(string, loc, len);
break;
}
if (ch == '_') continue;
if (i.high > max) wrapped = true;
i = i128_shl64(i, 4);
i = i128_add64(i, (uint64_t) char_hex_to_nibble(ch));
hex_characters++;
}
break;
case 'o':
is_unsigned = true;
max = UINT64_MAX >> 3;
for (size_t loc = 2; loc < len; loc++)
{
char ch = string[loc];
if (ch == 'i' || ch == 'I')
{
is_unsigned = false;
type_bits = read_num_type(string, loc, len);
break;
}
if (ch == 'u' || ch == 'U')
{
type_bits = read_num_type(string, loc, len);
break;
}
if (ch == '_') continue;
if (i.high > max) wrapped = true;
i = i128_shl64(i, 3);
i = i128_add64(i, (uint64_t)(ch - '0'));
oct_characters++;
}
break;
case 'b':
max = UINT64_MAX >> 1;
for (size_t loc = 2; loc < len; loc++)
{
char ch = string[loc];
if (ch == '_') continue;
binary_characters++;
if (i.high > max) wrapped = true;
i = i128_shl64(i, 1);
i = i128_add64(i, (uint64_t)(ch - '0'));
}
break;
default:
for (size_t loc = 0; loc < len; loc++)
{
char ch = string[loc];
switch (ch)
{
case 'i':
case 'I':
is_unsigned = false;
type_bits = read_num_type(string, loc, len);
goto EXIT;
case 'u':
case 'U':
is_unsigned = true;
type_bits = read_num_type(string, loc, len);
goto EXIT;
case '_':
continue;
case NUMBER_CHAR_CASE:
{
uint64_t old_top = i.high;
i = i128_mult64(i, 10);
i = i128_add64(i, (uint64_t)(ch - '0'));
if (!wrapped && old_top > i.high) wrapped = true;
break;
}
default:
UNREACHABLE
}
}
EXIT:
break;
}
if (wrapped)
{
SEMA_ERROR_HERE("Integer size exceeded 128 bits, max 128 bits are supported.");
return poisoned_expr;
}
expr_int->const_expr.const_kind = CONST_INTEGER;
expr_int->const_expr.is_hex = hex_characters > 0;
Type *type = is_unsigned ? type_cuint : type_cint;
expr_int->const_expr.narrowable = !type_bits;
if (type_bits)
{
if (type_bits < 0 || !is_power_of_two((uint64_t)type_bits) || type_bits > 128)
{
SEMA_ERROR_HERE("Integer type suffix should be i8, i16, i32, i64 or i128.");
return poisoned_expr;
}
}
else
{
if (hex_characters)
{
type_bits = 4 * hex_characters;
if (type_bits > 128)
{
SEMA_ERROR_HERE("%d hex digits indicates a bit width over 128, which is not supported.", hex_characters);
return poisoned_expr;
}
}
if (oct_characters)
{
type_bits = 3 * oct_characters;
if (type_bits > 128)
{
SEMA_ERROR_HERE("%d octal digits indicates a bit width over 128, which is not supported.", oct_characters);
return poisoned_expr;
}
}
if (binary_characters)
{
type_bits = binary_characters;
if (type_bits > 128)
{
SEMA_ERROR_HERE("%d binary digits indicates a bit width over 128, which is not supported.", binary_characters);
return poisoned_expr;
}
}
if (type_bits && type_bits < 8) type_bits = 8;
if (type_bits && !is_power_of_two((uint64_t)type_bits)) type_bits = (int)next_highest_power_of_2((uint32_t)type_bits);
}
if (type_bits) expr_int->const_expr.is_hex = false;
if (!type_bits)
{
type_bits = (int)type_size(type) * 8;
}
if (type_bits)
{
type = is_unsigned ? type_int_unsigned_by_bitsize((unsigned)type_bits) : type_int_signed_by_bitsize((unsigned)type_bits);
}
expr_int->const_expr.ixx = (Int) { i, type->type_kind };
if (!int_fits(expr_int->const_expr.ixx, type->type_kind))
{
unsigned radix = 10;
if (hex_characters) radix = 16;
if (oct_characters) radix = 8;
if (binary_characters) radix = 2;
if (type_bits)
{
SEMA_ERROR_HERE("'%s' does not fit in a '%c%d' literal.",
i128_to_string(i, radix, true), is_unsigned ? 'u' : 'i', type_bits);
}
else
{
SEMA_ERROR_HERE("'%s' does not fit in an %s literal.",
i128_to_string(i, radix, true), is_unsigned ? "unsigned int" : "int");
}
return poisoned_expr;
}
expr_int->type = type;
advance(c);
return expr_int;
}
/**
* Parse hex, skipping over invalid characters.
* @param result_pointer ref to place to put the data
* @param data start pointer
* @param end end pointer
*/
static void parse_hex(char *result_pointer, const char *data, const char *end)
{
char *data_current = result_pointer;
assert(data_current);
while (data < end)
{
int val;
int val2;
while ((val = char_hex_to_nibble(*(data++))) < 0) if (data == end) goto DONE;
while ((val2 = char_hex_to_nibble(*(data++))) < 0);
*(data_current++) = (char)((val << 4) | val2);
}
DONE:;
}
/**
* Slow base64 -> sextet
*/
static char base64_to_sextet(char c)
{
if (c >= 'A' && c <= 'Z') return c - 'A';
if (c >= 'a' && c <= 'z') return c - 'a' + 26;
if (c >= '0' && c <= '9') return c - '0' + 52;
if (c == '+') return 62;
if (c == '/') return 63;
if (c == '=') return 0;
return -1;
}
/**
* Parse hex, skipping over invalid characters.
* @param result_pointer ref to place to put the data
* @param data start pointer
* @param end end pointer
*/
static void parse_base64(char *result_pointer, char *result_pointer_end, const char *data, const char *end)
{
char *data_current = result_pointer;
assert(data_current);
while (data < end)
{
int val;
int val2;
int val3;
int val4;
while ((val = base64_to_sextet(*(data++))) < 0) if (data == end) goto DONE;
while ((val2 = base64_to_sextet(*(data++))) < 0);
while ((val3 = base64_to_sextet(*(data++))) < 0);
while ((val4 = base64_to_sextet(*(data++))) < 0);
uint32_t triplet = (uint32_t)((val << 3 * 6) + (val2 << 2 * 6) + (val3 << 6) + val4);
if (data_current < result_pointer_end) *(data_current++) = (char)((triplet >> 16) & 0xFF);
if (data_current < result_pointer_end) *(data_current++) = (char)((triplet >> 8) & 0xFF);
if (data_current < result_pointer_end) *(data_current++) = (char)(triplet & 0xFF);
}
DONE:;
}
static Expr *parse_bytes_expr(ParseContext *c, Expr *left)
{
assert(!left && "Had left hand side");
ArraySize len = 0;
char *data = NULL;
while (c->tok == TOKEN_BYTES)
{
ArraySize next_len = c->data.bytes_len;
if (!next_len)
{
advance(c);
continue;
}
ArraySize new_len = len + next_len;
char *new_data = MALLOC(new_len);
if (data)
{
memmove(new_data, data, len);
}
data = new_data;
if (c->data.is_base64)
{
const char *base64data = c->data.lex_start + 4;
const char *end = base64data + c->data.lex_len - 1 - 4;
parse_base64(new_data + len, new_data + next_len, base64data, end);
}
else
{
const char *hexdata = c->data.lex_start + 2;
const char *end = hexdata + c->data.lex_len - 1 - 2;
parse_hex(new_data + len, hexdata, end);
}
len = new_len;
advance(c);
}
Expr *expr_bytes = EXPR_NEW_TOKEN(EXPR_CONST);
expr_bytes->const_expr.bytes.ptr = data;
expr_bytes->const_expr.bytes.len = len;
expr_bytes->const_expr.const_kind = CONST_BYTES;
Type *type = type_get_array(type_char, len);
expr_bytes->type = type;
return expr_bytes;
}
static Expr *parse_char_lit(ParseContext *c, Expr *left)
{
assert(!left && "Had left hand side");
Expr *expr_int = EXPR_NEW_TOKEN(EXPR_CONST);
expr_int->const_expr.is_character = true;
expr_int->const_expr.ixx.i = c->data.char_value;
expr_int->const_expr.narrowable = true;
expr_int->const_expr.const_kind = CONST_INTEGER;
switch (c->data.width)
{
case 1:
expr_int->type = type_char;
expr_int->const_expr.ixx.type = TYPE_U8;
break;
case 2:
expr_int->type = type_ushort;
expr_int->const_expr.ixx.type = TYPE_U16;
break;
case 3:
case 4:
expr_int->type = type_uint;
expr_int->const_expr.ixx.type = TYPE_U32;
break;
case 5:
case 6:
case 7:
case 8:
expr_int->type = type_ulong;
expr_int->const_expr.ixx.type = TYPE_U64;
break;
default:
expr_int->type = type_u128;
expr_int->const_expr.ixx.type = TYPE_U128;
break;
}
advance(c);
return expr_int;
}
static Expr *parse_double(ParseContext *c, Expr *left)
{
assert(!left && "Had left hand side");
char *err;
Expr *number = EXPR_NEW_TOKEN(EXPR_CONST);
const char *original = symstr(c);
bool is_hex = original[0] == '0' && original[1] == 'x';
Float f = is_hex ? float_from_hex(original, &err) : float_from_string(original, &err);
if (f.type == TYPE_POISONED)
{
SEMA_ERROR_HERE(err);
return poisoned_expr;
}
number->const_expr.fxx = f;
switch (number->const_expr.fxx.type)
{
case TYPE_F128:
number->type = type_f128;
break;
case TYPE_F64:
number->type = type_double;
break;
case TYPE_F32:
number->type = type_float;
break;
case TYPE_F16:
number->type = type_half;
break;
default:
UNREACHABLE
}
number->const_expr.const_kind = CONST_FLOAT;
number->const_expr.narrowable = true;
advance(c);
return number;
}
static int append_esc_string_token(char *restrict dest, const char *restrict src, size_t *pos)
{
int scanned;
uint64_t unicode_char;
signed char scanned_char = char_is_valid_escape(src[0]);
if (scanned_char < 0) return -1;
switch (scanned_char)
{
case 'x':
{
int h = char_hex_to_nibble(src[1]);
int l = char_hex_to_nibble(src[2]);
if (h < 0 || l < 0) return -1;
unicode_char = ((unsigned) h << 4U) + (unsigned)l;
scanned = 3;
break;
}
case 'u':
{
int x1 = char_hex_to_nibble(src[1]);
int x2 = char_hex_to_nibble(src[2]);
int x3 = char_hex_to_nibble(src[3]);
int x4 = char_hex_to_nibble(src[4]);
if (x1 < 0 || x2 < 0 || x3 < 0 || x4 < 0) return -1;
unicode_char = ((unsigned) x1 << 12U) + ((unsigned) x2 << 8U) + ((unsigned) x3 << 4U) + (unsigned)x4;
scanned = 5;
break;
}
case 'U':
{
int x1 = char_hex_to_nibble(src[1]);
int x2 = char_hex_to_nibble(src[2]);
int x3 = char_hex_to_nibble(src[3]);
int x4 = char_hex_to_nibble(src[4]);
int x5 = char_hex_to_nibble(src[5]);
int x6 = char_hex_to_nibble(src[6]);
int x7 = char_hex_to_nibble(src[7]);
int x8 = char_hex_to_nibble(src[8]);
if (x1 < 0 || x2 < 0 || x3 < 0 || x4 < 0 || x5 < 0 || x6 < 0 || x7 < 0 || x8 < 0) return -1;
unicode_char = ((unsigned) x1 << 28U) + ((unsigned) x2 << 24U) + ((unsigned) x3 << 20U) + ((unsigned) x4 << 16U) +
((unsigned) x5 << 12U) + ((unsigned) x6 << 8U) + ((unsigned) x7 << 4U) + (unsigned)x8;
scanned = 9;
break;
}
default:
dest[(*pos)++] = scanned_char;
return 1;
}
if (unicode_char < 0x80U)
{
dest[(*pos)++] = (char)unicode_char;
}
else if (unicode_char < 0x800U)
{
dest[(*pos)++] = (char)(0xC0U | (unicode_char >> 6U));
dest[(*pos)++] = (char)(0x80U | (unicode_char & 0x3FU));
}
else if (unicode_char < 0x10000U)
{
dest[(*pos)++] = (char)(0xE0U | (unicode_char >> 12U));
dest[(*pos)++] = (char)(0x80U | ((unicode_char >> 6U) & 0x3FU));
dest[(*pos)++] = (char)(0x80U | (unicode_char & 0x3FU));
}
else
{
dest[(*pos)++] = (char)(0xF0U | (unicode_char >> 18U));
dest[(*pos)++] = (char)(0x80U | ((unicode_char >> 12U) & 0x3FU));
dest[(*pos)++] = (char)(0x80U | ((unicode_char >> 6U) & 0x3FU));
dest[(*pos)++] = (char)(0x80U | (unicode_char & 0x3FU));
}
return scanned;
}
static Expr *parse_string_literal(ParseContext *c, Expr *left)
{
assert(!left && "Had left hand side");
Expr *expr_string = EXPR_NEW_TOKEN(EXPR_CONST);
const char *str = symstr(c);
size_t len = c->data.strlen;
advance_and_verify(c, TOKEN_STRING);
// This is wasteful for adding many tokens together
// and can be optimized.
while (tok_is(c, TOKEN_STRING))
{
size_t next_len = c->data.strlen;
if (!next_len) continue;
char *buffer = malloc_string(len + next_len + 1);
memcpy(buffer, str, len);
memcpy(buffer + len, symstr(c), next_len);
len += next_len;
buffer[len] = '\0';
str = buffer;
advance_and_verify(c, TOKEN_STRING);
}
if (len > UINT32_MAX)
{
SEMA_ERROR_HERE("String exceeded max size.");
return poisoned_expr;
}
assert(str);
expr_string->const_expr.string.chars = str;
expr_string->const_expr.string.len = (uint32_t)len;
expr_string->type = type_get_ptr(type_get_array(type_char, len));
expr_string->const_expr.const_kind = CONST_STRING;
return expr_string;
}
static Expr *parse_bool(ParseContext *c, Expr *left)
{
assert(!left && "Had left hand side");
Expr *number = EXPR_NEW_TOKEN(EXPR_CONST);
number->const_expr = (ExprConst) { .b = tok_is(c, TOKEN_TRUE), .const_kind = CONST_BOOL };
number->type = type_bool;
advance(c);
return number;
}
static Expr *parse_null(ParseContext *c, Expr *left)
{
assert(!left && "Had left hand side");
Expr *number = EXPR_NEW_TOKEN(EXPR_CONST);
number->const_expr.const_kind = CONST_POINTER;
number->const_expr.ptr = 0;
number->type = type_voidptr;
advance(c);
return number;
}
Expr *parse_type_compound_literal_expr_after_type(ParseContext *c, TypeInfo *type_info)
{
Expr *expr = expr_new(EXPR_COMPOUND_LITERAL, type_info->span);
expr->expr_compound_literal.type_info = type_info;
EXPECT_OR_RET(TOKEN_LBRACE, poisoned_expr);
ASSIGN_EXPR_OR_RET(expr->expr_compound_literal.initializer, parse_initializer_list(c, NULL), poisoned_expr);
RANGE_EXTEND_PREV(expr);
return expr;
}
Expr *parse_any_expression(ParseContext *c, TypeInfo *type)
{
Expr *expr = expr_new(EXPR_VARIANT, type->span);
advance_and_verify(c, TOKEN_LBRACE);
ASSIGN_EXPRID_OR_RET(expr->variant_expr.ptr, parse_expr(c), poisoned_expr);
TRY_CONSUME_OR_RET(TOKEN_COMMA, "Expected a ','", poisoned_expr);
ASSIGN_EXPRID_OR_RET(expr->variant_expr.type_id, parse_expr(c), poisoned_expr);
TRY_CONSUME_OR_RET(TOKEN_RBRACE, "Missing end '}'", poisoned_expr);
return expr;
}
/**
* type_identifier ::= TYPE_IDENT initializer_list?
*
* @param left must be null.
* @return Expr*
*/
Expr *parse_type_expression_with_path(ParseContext *c, Path *path)
{
TypeInfo *type;
if (path)
{
type = type_info_new(TYPE_INFO_IDENTIFIER, path->span);
type->unresolved.path = path;
type->unresolved.name = symstr(c);
advance_and_verify(c, TOKEN_TYPE_IDENT);
RANGE_EXTEND_PREV(type);
ASSIGN_TYPE_OR_RET(type, parse_type_with_base(c, type), poisoned_expr);
type->failable = try_consume(c, TOKEN_BANG);
}
else
{
ASSIGN_TYPE_OR_RET(type, parse_optional_type(c), poisoned_expr);
}
if (tok_is(c, TOKEN_LBRACE))
{
if (type->resolve_status == RESOLVE_DONE && type->type == type_any)
{
return parse_any_expression(c, type);
}
return parse_type_compound_literal_expr_after_type(c, type);
}
Expr *expr = expr_new(EXPR_TYPEINFO, type->span);
expr->type_expr = type;
if (tok_is(c, TOKEN_SCOPE))
{
SEMA_ERROR_HERE("A type is never followed by '::', did you mean '.'?");
return poisoned_expr;
}
return expr;
}
/**
* function_block
* : '{|' stmt_list '|}'
*/
static Expr* parse_expr_block(ParseContext *c, Expr *left)
{
assert(!left && "Had left hand side");
Expr *expr = EXPR_NEW_TOKEN(EXPR_EXPR_BLOCK);
advance_and_verify(c, TOKEN_LBRAPIPE);
AstId *next = &expr->expr_block.first_stmt;
while (!try_consume(c, TOKEN_RBRAPIPE))
{
Ast *stmt = parse_stmt(c);
if (!ast_ok(stmt)) return poisoned_expr;
ast_append(&next, stmt);
}
RANGE_EXTEND_PREV(expr);
return expr;
}
ParseRule rules[TOKEN_EOF + 1] = {
[TOKEN_BOOL] = { parse_type_identifier, NULL, PREC_NONE },
[TOKEN_CHAR] = { parse_type_identifier, NULL, PREC_NONE },
[TOKEN_ICHAR] = { parse_type_identifier, NULL, PREC_NONE },
[TOKEN_SHORT] = { parse_type_identifier, NULL, PREC_NONE },
[TOKEN_USHORT] = { parse_type_identifier, NULL, PREC_NONE },
[TOKEN_INT] = { parse_type_identifier, NULL, PREC_NONE },
[TOKEN_UINT] = { parse_type_identifier, NULL, PREC_NONE },
[TOKEN_LONG] = { parse_type_identifier, NULL, PREC_NONE },
[TOKEN_ULONG] = { parse_type_identifier, NULL, PREC_NONE },
[TOKEN_INT128] = { parse_type_identifier, NULL, PREC_NONE },
[TOKEN_UINT128] = { parse_type_identifier, NULL, PREC_NONE },
[TOKEN_ISIZE] = { parse_type_identifier, NULL, PREC_NONE },
[TOKEN_USIZE] = { parse_type_identifier, NULL, PREC_NONE },
[TOKEN_IPTR] = { parse_type_identifier, NULL, PREC_NONE },
[TOKEN_UPTR] = { parse_type_identifier, NULL, PREC_NONE },
[TOKEN_IPTRDIFF] = { parse_type_identifier, NULL, PREC_NONE },
[TOKEN_UPTRDIFF] = { parse_type_identifier, NULL, PREC_NONE },
[TOKEN_FLOAT] = { parse_type_identifier, NULL, PREC_NONE },
[TOKEN_DOUBLE] = { parse_type_identifier, NULL, PREC_NONE },
[TOKEN_FLOAT16] = { parse_type_identifier, NULL, PREC_NONE },
[TOKEN_FLOAT128] = { parse_type_identifier, NULL, PREC_NONE },
[TOKEN_VOID] = { parse_type_identifier, NULL, PREC_NONE },
[TOKEN_TYPEID] = { parse_type_identifier, NULL, PREC_NONE },
[TOKEN_ANYERR] = { parse_type_identifier, NULL, PREC_NONE },
[TOKEN_VARIANT] = { parse_type_identifier, NULL, PREC_NONE },
[TOKEN_QUESTION] = { NULL, parse_ternary_expr, PREC_TERNARY },
[TOKEN_QUESTQUEST] = { NULL, parse_binary, PREC_TERNARY},
[TOKEN_ELVIS] = { NULL, parse_ternary_expr, PREC_TERNARY },
[TOKEN_PLUSPLUS] = { parse_unary_expr, parse_post_unary, PREC_CALL },
[TOKEN_MINUSMINUS] = { parse_unary_expr, parse_post_unary, PREC_CALL },
[TOKEN_LPAREN] = { parse_grouping_expr, parse_call_expr, PREC_CALL },
[TOKEN_LBRAPIPE] = { parse_expr_block, NULL, PREC_NONE },
[TOKEN_TRY] = { parse_try_expr, NULL, PREC_NONE },
[TOKEN_CATCH] = { parse_try_expr, NULL, PREC_NONE },
[TOKEN_BANGBANG] = { NULL, parse_force_unwrap_expr, PREC_CALL },
[TOKEN_LBRACKET] = { NULL, parse_subscript_expr, PREC_CALL },
[TOKEN_MINUS] = { parse_unary_expr, parse_binary, PREC_ADDITIVE },
[TOKEN_PLUS] = { NULL, parse_binary, PREC_ADDITIVE },
[TOKEN_DIV] = { NULL, parse_binary, PREC_MULTIPLICATIVE },
[TOKEN_MOD] = { NULL, parse_binary, PREC_MULTIPLICATIVE },
[TOKEN_STAR] = { parse_unary_expr, parse_binary, PREC_MULTIPLICATIVE },
[TOKEN_DOT] = { NULL, parse_access_expr, PREC_CALL },
[TOKEN_BANG] = { parse_unary_expr, parse_failable, PREC_CALL },
[TOKEN_BYTES] = { parse_bytes_expr, NULL, PREC_NONE },
[TOKEN_BIT_NOT] = { parse_unary_expr, NULL, PREC_UNARY },
[TOKEN_BIT_XOR] = { NULL, parse_binary, PREC_BIT },
[TOKEN_BIT_OR] = { NULL, parse_binary, PREC_BIT },
[TOKEN_AMP] = { parse_unary_expr, parse_binary, PREC_BIT },
[TOKEN_EQEQ] = { NULL, parse_binary, PREC_RELATIONAL },
[TOKEN_NOT_EQUAL] = { NULL, parse_binary, PREC_RELATIONAL },
[TOKEN_GREATER] = { NULL, parse_binary, PREC_RELATIONAL },
[TOKEN_GREATER_EQ] = { NULL, parse_binary, PREC_RELATIONAL },
[TOKEN_LESS] = { NULL, parse_binary, PREC_RELATIONAL },
[TOKEN_LESS_EQ] = { NULL, parse_binary, PREC_RELATIONAL },
[TOKEN_SHL] = { NULL, parse_binary, PREC_SHIFT },
[TOKEN_SHR] = { NULL, parse_binary, PREC_SHIFT },
[TOKEN_TRUE] = { parse_bool, NULL, PREC_NONE },
[TOKEN_FALSE] = { parse_bool, NULL, PREC_NONE },
[TOKEN_NULL] = { parse_null, NULL, PREC_NONE },
[TOKEN_INTEGER] = { parse_integer, NULL, PREC_NONE },
[TOKEN_BUILTIN] = { parse_builtin, NULL, PREC_NONE },
[TOKEN_CHAR_LITERAL] = { parse_char_lit, NULL, PREC_NONE },
[TOKEN_STRING] = { parse_string_literal, NULL, PREC_NONE },
[TOKEN_REAL] = { parse_double, NULL, PREC_NONE },
[TOKEN_OR] = { NULL, parse_binary, PREC_OR },
[TOKEN_AND] = { parse_unary_expr, parse_binary, PREC_AND },
[TOKEN_EQ] = { NULL, parse_binary, PREC_ASSIGNMENT },
[TOKEN_PLUS_ASSIGN] = { NULL, parse_binary, PREC_ASSIGNMENT },
[TOKEN_MINUS_ASSIGN] = { NULL, parse_binary, PREC_ASSIGNMENT },
[TOKEN_MULT_ASSIGN] = { NULL, parse_binary, PREC_ASSIGNMENT },
[TOKEN_MOD_ASSIGN] = { NULL, parse_binary, PREC_ASSIGNMENT },
[TOKEN_DIV_ASSIGN] = { NULL, parse_binary, PREC_ASSIGNMENT },
[TOKEN_BIT_XOR_ASSIGN] = { NULL, parse_binary, PREC_ASSIGNMENT },
[TOKEN_BIT_AND_ASSIGN] = { NULL, parse_binary, PREC_ASSIGNMENT },
[TOKEN_BIT_OR_ASSIGN] = { NULL, parse_binary, PREC_ASSIGNMENT },
[TOKEN_SHR_ASSIGN] = { NULL, parse_binary, PREC_ASSIGNMENT },
[TOKEN_SHL_ASSIGN] = { NULL, parse_binary, PREC_ASSIGNMENT },
[TOKEN_IDENT] = { parse_identifier_starting_expression, NULL, PREC_NONE },
[TOKEN_TYPE_IDENT] = { parse_type_identifier, NULL, PREC_NONE },
[TOKEN_CT_IDENT] = { parse_ct_ident, NULL, PREC_NONE },
[TOKEN_CONST_IDENT] = { parse_identifier, NULL, PREC_NONE },
[TOKEN_CT_CONST_IDENT] = { parse_ct_ident, NULL, PREC_NONE },
[TOKEN_CT_TYPE_IDENT] = { parse_type_identifier, NULL, PREC_NONE },
[TOKEN_HASH_IDENT] = { parse_hash_ident, NULL, PREC_NONE },
[TOKEN_AT_IDENT] = { parse_identifier, NULL, PREC_NONE },
//[TOKEN_HASH_TYPE_IDENT] = { parse_type_identifier, NULL, PREC_NONE }
[TOKEN_CT_SIZEOF] = { parse_ct_sizeof, NULL, PREC_NONE },
[TOKEN_CT_ALIGNOF] = { parse_ct_call, NULL, PREC_NONE },
[TOKEN_CT_DEFINED] = { parse_ct_call, NULL, PREC_NONE },
[TOKEN_CT_EVAL] = { parse_ct_eval, NULL, PREC_NONE },
[TOKEN_CT_EXTNAMEOF] = { parse_ct_call, NULL, PREC_NONE },
[TOKEN_CT_OFFSETOF] = { parse_ct_call, NULL, PREC_NONE },
[TOKEN_CT_NAMEOF] = { parse_ct_call, NULL, PREC_NONE },
[TOKEN_CT_QNAMEOF] = { parse_ct_call, NULL, PREC_NONE },
[TOKEN_CT_TYPEOF] = { parse_type_expr, NULL, PREC_NONE },
[TOKEN_CT_STRINGIFY] = { parse_ct_stringify, NULL, PREC_NONE },
[TOKEN_CT_EVALTYPE] = { parse_type_expr, NULL, PREC_NONE },
[TOKEN_CT_CONVERTIBLE] = { parse_ct_conv, NULL, PREC_NONE },
[TOKEN_CT_CASTABLE] = { parse_ct_conv, NULL, PREC_NONE },
[TOKEN_LBRACE] = { parse_initializer_list, NULL, PREC_NONE },
};
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