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postfix chain

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Yaossg 2024-11-17 10:29:04 +08:00
parent 3910fc3413
commit fc9ac15c4b
2 changed files with 58 additions and 6 deletions
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17
boot.c
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@ -249,12 +249,16 @@ void next_token() {
} else if (ch == '/') {
int ch2 = getchar();
if (ch2 == '/') {
while ((ch = getchar()) != '\n');
do ch = getchar(); while (ch != '\n' && ch != -1);
next_token();
return;
} else if (ch2 == '*') {
while (1) {
ch = getchar();
if (ch == -1) {
eprintf("expecting '*/'\n");
exit(1);
}
if (ch == '*') {
ch = getchar();
if (ch == '/') {
@ -773,7 +777,7 @@ int parse_postfix_expr() {
store_t0(reg);
printf(" addi t0, t0, %d\n", step_of(type));
store_t0(lhs);
return reg;
lhs = reg;
} else if (token_type == TOKEN_DEC) {
int type = local_type[lhs];
int reg = next_reg(type);
@ -781,11 +785,11 @@ int parse_postfix_expr() {
store_t0(reg);
printf(" addi t0, t0, -%d\n", step_of(type));
store_t0(lhs);
return reg;
lhs = reg;
} else if (token_type == TOKEN_BRACKET_LEFT) {
int rhs = parse_expr();
expect_token(TOKEN_BRACKET_RIGHT);
return indirection_of(asm_add(lhs, rhs));
lhs = indirection_of(asm_add(lhs, rhs));
} else if (token_type == TOKEN_PAREN_LEFT) {
int arg = 0;
int args[8];
@ -817,12 +821,13 @@ int parse_postfix_expr() {
load_address(0, lhs);
printf(" jalr t0\n");
printf(" mv t0, a0\n");
return materialize_t0(local_type[lhs]);
lhs = materialize_t0(local_type[lhs]);
} else {
unget_token();
return lhs;
break;
}
}
return lhs;
}
int parse_prefix_expr() {