Yaossg/RVBTCC
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

more const

Browse source
This commit is contained in:
Yaossg 2024-11-17 17:01:18 +08:00
parent 5670654667
commit e97820d7ef
2 changed files with 52 additions and 58 deletions
Download patch file Download diff file Expand all files Collapse all files

104
boot.c
View file

@ -55,21 +55,32 @@ const int TOKEN_BRACKET_RIGHT = 53;
const int TOKEN_BRACE_LEFT = 54;
const int TOKEN_BRACE_RIGHT = 55;
const int TOKEN_STRING = 99;
const int TOKEN_NUMBER = 100;
const int TOKEN_ID = 101;
const int TOKEN_INT = 102;
const int TOKEN_IF = 103;
const int TOKEN_ELSE = 104;
const int TOKEN_WHILE = 105;
const int TOKEN_BREAK = 106;
const int TOKEN_CONTINUE = 107;
const int TOKEN_RETURN = 108;
const int TOKEN_VOID = 109;
const int TOKEN_CONST = 110;
const int TOKEN_CHAR = 111;
const int TOKEN_FOR = 112;
const int TOKEN_DO = 113;
const int TOKEN_STRING = 150;
const int TOKEN_IF = 102;
const int TOKEN_ELSE = 103;
const int TOKEN_WHILE = 104;
const int TOKEN_FOR = 105;
const int TOKEN_DO = 106;
const int TOKEN_BREAK = 107;
const int TOKEN_CONTINUE = 108;
const int TOKEN_RETURN = 109;
const int TOKEN_CONST = 127;
const int TOKEN_VOID = 128;
const int TOKEN_INT = 129;
const int TOKEN_CHAR = 130;
const int TYPE_VOID = 0;
const int TYPE_INT = 1;
const int TYPE_CHAR = 2;
const int TYPE_VOID_PTR = 16;
const int TYPE_INT_PTR = 17;
const int TYPE_CHAR_PTR = 18;
const int TYPE_PTR_MASK = 16;
const int TYPE_TOKEN_MASK = 128;
int parse_int(int ch) {
int num = ch - '0';
@ -390,39 +401,24 @@ void expect_token(int expected_type) {
}
}
const int TYPE_VOID = 0;
const int TYPE_INT = 1;
const int TYPE_CHAR = 2;
const int TYPE_VOID_PTR = 16;
const int TYPE_INT_PTR = 17;
const int TYPE_CHAR_PTR = 18;
const int TYPE_PTR_MASK = 16;
int parse_type() {
void ignore_const() {
if (token_type == TOKEN_CONST) {
next_token();
}
if (token_type == TOKEN_INT) {
}
int parse_type() {
ignore_const();
if (token_type == TOKEN_INT || token_type == TOKEN_CHAR || token_type == TOKEN_VOID) {
int type = token_type & ~TYPE_TOKEN_MASK;
next_token();
ignore_const();
if (token_type == TOKEN_STAR) {
return TYPE_INT_PTR;
ignore_const();
return type | TYPE_PTR_MASK;
}
unget_token();
return TYPE_INT;
} else if (token_type == TOKEN_CHAR) {
next_token();
if (token_type == TOKEN_STAR) {
return TYPE_CHAR_PTR;
}
unget_token();
return TYPE_CHAR;
} else if (token_type == TOKEN_VOID) {
next_token();
if (token_type == TOKEN_STAR) {
return TYPE_VOID_PTR;
}
unget_token();
return TYPE_VOID;
return type;
} else {
return -1;
}
@ -553,8 +549,7 @@ void load(int rd, int id) {
const char* op = "lw"; // int
if (type == TYPE_CHAR) {
op = "lb";
}
if (type & TYPE_PTR_MASK) {
} else if (type & TYPE_PTR_MASK) {
op = "ld";
}
printf(" %s t%d, 0(t%d) # id: type %d\n", op, rd, rd, type);
@ -566,8 +561,7 @@ void store_t0(int id) {
const char* op = "sw"; // int
if (type == TYPE_CHAR) {
op = "sb";
}
if (type & TYPE_PTR_MASK) {
} else if (type & TYPE_PTR_MASK) {
op = "sd";
}
printf(" %s t0, 0(t1) # id: type %d\n", op, type);
@ -1356,7 +1350,12 @@ void parse_global_variable(int id, const char* name, int type) {
expect_token(TOKEN_SEMICOLON);
}
void parse_decl(int type) {
void parse_global_declaration() {
int type = parse_type();
if (type < 0) {
eprintf("unexpected token: %d\n", token_type);
exit(1);
}
expect_token(TOKEN_ID);
int id = token_data;
char* name = id_table + id_lut[id];
@ -1372,15 +1371,9 @@ void parse_decl(int type) {
void parse_top_level() {
next_token();
int decl_type;
if (token_type == TOKEN_EOF) {
if (token_type == TOKEN_EOF)
return;
} else if ((decl_type = parse_type()) >= 0) {
parse_decl(decl_type);
} else {
eprintf("unexpected token: %d\n", token_type);
exit(1);
}
parse_global_declaration();
parse_top_level();
}
@ -1388,9 +1381,9 @@ void dump_string_table() {
printf(".data\n");
for (int i = 0; i < string_lut_size; ++i) {
printf(".LC%d: .string \"", i);
int offset = 0;
int ch;
while ((ch = string_table[string_lut[i] + offset]) != 0) {
int offset = string_lut[i];
int ch;
while ((ch = string_table[offset++]) != 0) {
if (ch == '\n') {
printf("\\n");
} else if (ch == '\t') {
@ -1408,7 +1401,6 @@ void dump_string_table() {
} else {
printf("%c", ch);
}
offset++;
}
printf("\"\n");
}