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https://github.com/rui314/chibicc
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[GNU] Add statement expression
This is a GNU C extension but will be useful for writing tests.
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c2cc1d3c45
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@ -98,6 +98,7 @@ typedef enum {
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ND_BLOCK, // { ... }
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ND_FUNCALL, // Function call
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ND_EXPR_STMT, // Expression statement
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ND_STMT_EXPR, // Statement expression
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ND_VAR, // Variable
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ND_NUM, // Integer
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} NodeKind;
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@ -119,7 +120,7 @@ struct Node {
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Node *init;
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Node *inc;
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// Block
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// Block or statement expression
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Node *body;
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// Function call
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@ -6,6 +6,7 @@ static char *argreg64[] = {"%rdi", "%rsi", "%rdx", "%rcx", "%r8", "%r9"};
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static Obj *current_fn;
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static void gen_expr(Node *node);
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static void gen_stmt(Node *node);
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static int count(void) {
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static int i = 1;
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@ -104,6 +105,10 @@ static void gen_expr(Node *node) {
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gen_expr(node->rhs);
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store(node->ty);
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return;
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case ND_STMT_EXPR:
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for (Node *n = node->body; n; n = n->next)
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gen_stmt(n);
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return;
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case ND_FUNCALL: {
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int nargs = 0;
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for (Node *arg = node->args; arg; arg = arg->next) {
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15
parse.c
15
parse.c
@ -545,8 +545,21 @@ static Node *funcall(Token **rest, Token *tok) {
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return node;
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}
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// primary = "(" expr ")" | "sizeof" unary | ident func-args? | str | num
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// primary = "(" "{" stmt+ "}" ")"
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// | "(" expr ")"
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// | "sizeof" unary
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// | ident func-args?
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// | str
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// | num
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static Node *primary(Token **rest, Token *tok) {
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if (equal(tok, "(") && equal(tok->next, "{")) {
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// This is a GNU statement expresssion.
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Node *node = new_node(ND_STMT_EXPR, tok);
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node->body = compound_stmt(&tok, tok->next->next)->body;
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*rest = skip(tok, ")");
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return node;
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}
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if (equal(tok, "(")) {
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Node *node = expr(&tok, tok->next);
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*rest = skip(tok, ")");
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6
test.sh
6
test.sh
@ -207,4 +207,10 @@ assert 119 'int main() { return "\x77"[0]; }'
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assert 165 'int main() { return "\xA5"[0]; }'
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assert 255 'int main() { return "\x00ff"[0]; }'
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assert 0 'int main() { return ({ 0; }); }'
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assert 2 'int main() { return ({ 0; 1; 2; }); }'
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assert 1 'int main() { ({ 0; return 1; 2; }); return 3; }'
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assert 6 'int main() { return ({ 1; }) + ({ 2; }) + ({ 3; }); }'
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assert 3 'int main() { return ({ int x=3; x; }); }'
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echo OK
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12
type.c
12
type.c
@ -89,5 +89,17 @@ void add_type(Node *node) {
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error_tok(node->tok, "invalid pointer dereference");
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node->ty = node->lhs->ty->base;
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return;
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case ND_STMT_EXPR:
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if (node->body) {
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Node *stmt = node->body;
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while (stmt->next)
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stmt = stmt->next;
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if (stmt->kind == ND_EXPR_STMT) {
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node->ty = stmt->lhs->ty;
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return;
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}
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}
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error_tok(node->tok, "statement expression returning void is not supported");
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return;
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}
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}
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