Implement string and character backslash constants. (b4758ff1) · Commits · e / os / android_system_core

libacc/acc.cpp

+97 −16

Original line number	Diff line number	Diff line
		@@ -1841,14 +1841,93 @@ class Compiler : public ErrorSink {
		return isalnum(ch) \| (ch == '_');
		}

		/* read a character constant */
		void getq() {
		/* read a character constant, advances ch to after end of constant */
		int getq() {
		int val = ch;
		if (ch == '\\') {
		inp();
		if (ch == 'n')
		ch = '\n';
		if (isoctal(ch)) {
		// 1 to 3 octal characters.
		val = 0;
		for(int i = 0; i < 3; i++) {
		if (isoctal(ch)) {
		val = (val << 3) + ch - '0';
		inp();
		}
		}
		return val;
		} else if (ch == 'x' \|\| ch == 'X') {
		// N hex chars
		inp();
		if (! isxdigit(ch)) {
		error("'x' character escape requires at least one digit.");
		} else {
		val = 0;
		while (isxdigit(ch)) {
		int d = ch;
		if (isdigit(d)) {
		d -= '0';
		} else if (d <= 'F') {
		d = d - 'A' + 10;
		} else {
		d = d - 'a' + 10;
		}
		val = (val << 4) + d;
		inp();
		}
		}
		} else {
		int val = ch;
		switch (ch) {
		case 'a':
		val = '\a';
		break;
		case 'b':
		val = '\b';
		break;
		case 'f':
		val = '\f';
		break;
		case 'n':
		val = '\n';
		break;
		case 'r':
		val = '\r';
		break;
		case 't':
		val = '\t';
		break;
		case 'v':
		val = '\v';
		break;
		case '\\':
		val = '\\';
		break;
		case '\'':
		val = '\'';
		break;
		case '"':
		val = '"';
		break;
		case '?':
		val = '?';
		break;
		default:
		error("Undefined character escape %c", ch);
		break;
		}
		inp();
		return val;
		}
		} else {
		inp();
		}
		return val;
		}

		static bool isoctal(int ch) {
		return ch >= '0' && ch <= '7';
		}

		void next() {
		int l, a;
		@@ -1908,10 +1987,12 @@ class Compiler : public ErrorSink {
		inp();
		if (tok == '\'') {
		tok = TOK_NUM;
		getq();
		tokc = ch;
		inp();
		tokc = getq();
		if (ch != '\'') {
		error("Expected a ' character, got %c", ch);
		} else {
		inp();
		}
		} else if ((tok == '/') & (ch == '*')) {
		inp();
		while (ch) {
		@@ -2071,14 +2152,14 @@ class Compiler : public ErrorSink {
		int c;
		String tString;
		t = 0;
		n = 1; /* type of expression 0 = forward, 1 = value, other =
		lvalue */
		n = 1; /* type of expression 0 = forward, 1 = value, other = lvalue */
		if (tok == '\"') {
		pGen->li((int) glo);
		while (ch != '\"') {
		getq();
		*allocGlobalSpace(1) = ch;
		inp();
		while (ch != '\"' && ch != EOF) {
		*allocGlobalSpace(1) = getq();
		}
		if (ch != '\"') {
		error("Unterminated string constant.");
		}
		*glo = 0;
		/* align heap */
		@@ -2176,7 +2257,7 @@ class Compiler : public ErrorSink {
		a = pGen->beginFunctionCallArguments();
		next();
		l = 0;
		while (tok != ')') {
		while (tok != ')' && tok != EOF) {
		expr();
		pGen->storeR0ToArg(l);
		if (tok == ',')
		@@ -2184,7 +2265,7 @@ class Compiler : public ErrorSink {
		l = l + 4;
		}
		pGen->endFunctionCallArguments(a, l);
		next();
		skip(')');
		if (!n) {
		/* forward reference */
		t = t + 4;

libacc/tests/data/constants.c

0 → 100644

+30 −0

Original line number	Diff line number	Diff line
		#define FOO 0x10

		int main() {
		printf("0 = %d\n", 0);
		printf("010 = %d\n", 010);
		printf("0x10 = %d\n", FOO);
		printf("'\\a' = %d\n", '\a');
		printf("'\\b' = %d\n", '\b');
		printf("'\\f' = %d\n", '\f');
		printf("'\\n' = %d\n", '\n');
		printf("'\\r' = %d\n", '\r');
		printf("'\\t' = %d\n", '\t');
		printf("'\\v' = %d\n", '\v');
		// Undefined
		// printf("'\\z' = %d\n", '\z');
		printf("'\\\\' = %d\n", '\\');
		printf("'\\'' = %d\n", '\'');
		printf("'\\\"' = %d\n", '\"');
		printf("'\\?' = %d\n", '\?');
		printf("'\\0' = %d\n", '\0');
		printf("'\\1' = %d\n", '\1');
		printf("'\\12' = %d\n", '\12');
		printf("'\\123' = %d\n", '\123');
		printf("'\\x0' = %d\n", '\x0');
		printf("'\\x1' = %d\n", '\x1');
		printf("'\\x12' = %d\n", '\x12');
		printf("'\\x123' = %d\n", '\x123');
		printf("'\\x1f' = %d\n", '\x1f');
		printf("'\\x1F' = %d\n", '\x1F');
		}