int postfix_expression(void) {
if ( primary_expression() ) {
} else if( postfix_expression() ) {
if( lookaheadT.type == LBRACKET ) {
match(LBRACKET);
expression();
match(RBRACKET);
} else if( lookaheadT.type == LPAREN ) {
match(LPAREN);
if( argument_expression_list() ) {
}
match(RPAREN);
} else if( lookaheadT.type == PERIOD ) {
match(PERIOD);
match(ID);
} else if( lookaheadT.type == PTR_OP ) {
match(PTR_OP);
match(ID);
} else if( lookaheadT.type == INC_OP ) {
match(INC_OP);
} else if( lookaheadT.type == DEC_OP ) {
match(DEC_OP);
} else {
abort();
}
} else {
abort();
}
}
int argument_expression_list(void) {
if( assignment_expression() ) {
} else if( argument_expression_list() ) {
match(COMMA);
assignment_expression();
} else {
abort();
}
}
/**
后缀表达式
<postfix_expression>::=<primary_expression>
{<TK_OPENPA><expression><TK_CLOSEPA>
|<TK_OPENPA><TK_CLOSEPA>
|<TK_OPENPA><arguement_expression_list><TK_CLOSEPA>
|<TK_DOT><IDENTIFIER>
|<TK_POINTSTO><IDENTIFIER>}
*/
void postfix_expression(){
primary_expression();
while(1){
if(TK_DOT == token || TK_POINTSTO == token){
get_token();
token |= SC_MEMBER;
get_token();
}else if(TK_OPENBR == token){
get_token();
expression();
skip(TK_CLOSEBR);
get_token();
}else if(TK_OPENPA == token){
argument_expression_list();
}else
break;
}
}
struct Symbol* postfix_expression(struct PostfixExpression* node, struct Symbol** orig_symbol)
{
struct Symbol* symbol, *ref, *newSymbol = 0, *symbol1;
switch (node->type) {
case 0:
return primary_expression(node->primaryExpression, orig_symbol);
case 1:
symbol = load_symbol(postfix_expression(node->postfixExpression, orig_symbol));
test_referenceable(symbol);
ref = load_symbol(expression_func(node->expression));
*orig_symbol = new_symbol("", symbol->storage, 0, symbol->specifier, symbol->stars - 1, 0, 0);
if (symbol->stars == 1)
(*orig_symbol)->specifier = 32;
ADDSTRING(" ");
code_gen_symbol('%', *orig_symbol);
ADDSTRING(" = getelementptr inbounds ");
code_gen_type_specifier(symbol->specifier, 0, symbol->length, symbol->stars);
ADDSTRING(" ");
if (symbol->depth == 0)
code_gen_symbol('@', symbol);
else
code_gen_symbol('%', symbol);
if (symbol->length)
ADDSTRING(", i32 0");
ADDSTRING(", ");
test_integer(ref);
code_gen_type_specifier(ref->specifier, 0, 0, 0);
ADDSTRING(" ");
code_gen_symbol('%', ref);
ADDSTRING("\n");
ADDSTRING(" ");
newSymbol = new_symbol("", 0, 2, symbol->specifier, symbol->stars - 1, 0, 0);
newSymbol->reference = *orig_symbol;
code_gen_symbol('%', newSymbol);
ADDSTRING(" = load ");
code_gen_type_specifier(symbol->specifier, 0, (*orig_symbol)->length, symbol->stars);
ADDSTRING(" ");
code_gen_symbol('%', *orig_symbol);
ADDSTRING(", align ");
if (newSymbol->stars)
{
if (PTR_LENGTH == 8)
{
ADDSTRING("8\n");
}
else
{
ADDSTRING("4\n");
}
}
else
{
int len = len_gen_type_specifier(newSymbol->specifier);
sprintf(buf, "%d\n", len);
ADDSTRING(buf);
}
return newSymbol;
case 2:
case 3:
symbol = postfix_expression(node->postfixExpression, orig_symbol);
test_functionable(symbol);
if (node->type == 3)
{
argument_expression_list(node->argumentExpressionList, symbol->parameterlist);
}
if (!(symbol->specifier & 0x02)) {
newSymbol = new_symbol("", symbol->storage, 2, symbol->specifier, symbol->stars, 0, symbol->length);
ADDSTRING(" ");
code_gen_symbol('%', newSymbol);
ADDSTRING(" = call ");
} else {
ADDSTRING(" call ");
newSymbol = symbol;
}
if (strcmp(symbol->name, "free") != 0)
{
code_gen_type_specifier(symbol->specifier, 0, symbol->length, symbol->stars);
ADDSTRING(" ");
if (strcmp(symbol->name, "printf") == 0 || strcmp(symbol->name, "scanf") == 0)
{
ADDSTRING("(i8*, ...)* ");
}
code_gen_symbol('@', symbol);
}
else
{
ADDSTRING("i32 (");
code_gen_type_specifier(symbol_arg[0]->specifier, 0, 0, symbol_arg[0]->stars);
ADDSTRING(", ...)* bitcast (i32 (...)* @free to i32 (");
code_gen_type_specifier(symbol_arg[0]->specifier, 0, 0, symbol_arg[0]->stars);
ADDSTRING(", ...)*)");
}
ADDSTRING("(");
if (node->type == 3)
{
pop_arg();
}
ADDSTRING(")\n");
*orig_symbol = newSymbol;
return newSymbol;
case 4:
case 5:
// to do: struct
return 0;
case 6:
case 7:
symbol = load_symbol(postfix_expression(node->postfixExpression, orig_symbol));
test_changeable(*orig_symbol);
symbol1 = new_symbol("", symbol->storage, 2, symbol->specifier, symbol->stars, 0, symbol->length);
ADDSTRING(" ");
code_gen_symbol('%', symbol1);
ADDSTRING(" = ");
if ((symbol->specifier & (3 << 6)) > 0)
{
ADDSTRING("f");
}
if (node->type == 6)
{
ADDSTRING("add ");
}
else
{
ADDSTRING("sub ");
}
code_gen_type_specifier(symbol->specifier,1,symbol->length, symbol->stars);
ADDSTRING(" ");
code_gen_symbol('%', symbol);
ADDSTRING(", ");
if ((symbol->specifier & (3 << 6)) > 0)
{
ADDSTRING("1.000000e+00\n");
}
else
{
ADDSTRING("1\n");
}
ADDSTRING(" store ");
code_gen_type_specifier(symbol->specifier,0,symbol->length, symbol->stars);
ADDSTRING(" ");
code_gen_symbol('%', symbol1);
ADDSTRING(", ");
code_gen_type_specifier(symbol->specifier,0,symbol->length, symbol->stars);
ADDSTRING("* ");
code_gen_symbol('%', *orig_symbol);
ADDSTRING(", align ");
int l = len_gen_type_specifier(symbol->specifier);
sprintf(buf, "%d", l);
ADDSTRING(buf);
ADDSTRING("\n");
return symbol;
default:
return 0;
}
}