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gmqcc/parser.c

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#include <stdio.h>
#include <stdarg.h>
#include "gmqcc.h"
#include "lexer.h"
typedef struct {
char *name;
ast_expression *var;
} varentry_t;
typedef struct {
lex_file *lex;
int tok;
MEM_VECTOR_MAKE(varentry_t, globals);
MEM_VECTOR_MAKE(varentry_t, fields);
MEM_VECTOR_MAKE(ast_function*, functions);
MEM_VECTOR_MAKE(ast_value*, imm_float);
MEM_VECTOR_MAKE(ast_value*, imm_string);
MEM_VECTOR_MAKE(ast_value*, imm_vector);
ast_value *imm_float_zero;
ast_value *imm_vector_zero;
size_t crc_globals;
size_t crc_fields;
ast_function *function;
MEM_VECTOR_MAKE(varentry_t, locals);
size_t blocklocal;
size_t errors;
/* TYPE_FIELD -> parser_find_fields is used instead of find_var
* TODO: TYPE_VECTOR -> x, y and z are accepted in the gmqcc standard
* anything else: type error
*/
qcint memberof;
} parser_t;
MEM_VEC_FUNCTIONS(parser_t, varentry_t, globals)
MEM_VEC_FUNCTIONS(parser_t, varentry_t, fields)
MEM_VEC_FUNCTIONS(parser_t, ast_value*, imm_float)
MEM_VEC_FUNCTIONS(parser_t, ast_value*, imm_string)
MEM_VEC_FUNCTIONS(parser_t, ast_value*, imm_vector)
MEM_VEC_FUNCTIONS(parser_t, varentry_t, locals)
MEM_VEC_FUNCTIONS(parser_t, ast_function*, functions)
static bool GMQCC_WARN parser_pop_local(parser_t *parser);
static bool parse_variable(parser_t *parser, ast_block *localblock);
static ast_block* parse_block(parser_t *parser, bool warnreturn);
static bool parse_block_into(parser_t *parser, ast_block *block, bool warnreturn);
static ast_expression* parse_statement_or_block(parser_t *parser);
static ast_expression* parse_expression_leave(parser_t *parser, bool stopatcomma);
static ast_expression* parse_expression(parser_t *parser, bool stopatcomma);
static void parseerror(parser_t *parser, const char *fmt, ...)
{
va_list ap;
parser->errors++;
va_start(ap, fmt);
vprintmsg(LVL_ERROR, parser->lex->tok.ctx.file, parser->lex->tok.ctx.line, "parse error", fmt, ap);
va_end(ap);
}
/* returns true if it counts as an error */
static bool GMQCC_WARN parsewarning(parser_t *parser, int warntype, const char *fmt, ...)
{
va_list ap;
int lvl = LVL_WARNING;
if (!OPTS_WARN(warntype))
return false;
if (opts_werror) {
parser->errors++;
lvl = LVL_ERROR;
}
va_start(ap, fmt);
vprintmsg(lvl, parser->lex->tok.ctx.file, parser->lex->tok.ctx.line, "warning", fmt, ap);
va_end(ap);
return opts_werror;
}
static bool GMQCC_WARN genwarning(lex_ctx ctx, int warntype, const char *fmt, ...)
{
va_list ap;
int lvl = LVL_WARNING;
if (!OPTS_WARN(warntype))
return false;
if (opts_werror)
lvl = LVL_ERROR;
va_start(ap, fmt);
vprintmsg(lvl, ctx.file, ctx.line, "warning", fmt, ap);
va_end(ap);
return opts_werror;
}
/**********************************************************************
* some maths used for constant folding
*/
vector vec3_add(vector a, vector b)
{
vector out;
out.x = a.x + b.x;
out.y = a.y + b.y;
out.z = a.z + b.z;
return out;
}
vector vec3_sub(vector a, vector b)
{
vector out;
out.x = a.x - b.x;
out.y = a.y - b.y;
out.z = a.z - b.z;
return out;
}
qcfloat vec3_mulvv(vector a, vector b)
{
return (a.x * b.x + a.y * b.y + a.z * b.z);
}
vector vec3_mulvf(vector a, float b)
{
vector out;
out.x = a.x * b;
out.y = a.y * b;
out.z = a.z * b;
return out;
}
/**********************************************************************
* parsing
*/
bool parser_next(parser_t *parser)
{
/* lex_do kills the previous token */
parser->tok = lex_do(parser->lex);
if (parser->tok == TOKEN_EOF)
return true;
if (parser->tok >= TOKEN_ERROR) {
parseerror(parser, "lex error");
return false;
}
return true;
}
#define parser_tokval(p) ((p)->lex->tok.value)
#define parser_token(p) (&((p)->lex->tok))
#define parser_ctx(p) ((p)->lex->tok.ctx)
static ast_value* parser_const_float(parser_t *parser, double d)
{
size_t i;
ast_value *out;
for (i = 0; i < parser->imm_float_count; ++i) {
if (parser->imm_float[i]->constval.vfloat == d)
return parser->imm_float[i];
}
out = ast_value_new(parser_ctx(parser), "#IMMEDIATE", TYPE_FLOAT);
out->isconst = true;
out->constval.vfloat = d;
if (!parser_t_imm_float_add(parser, out)) {
ast_value_delete(out);
return NULL;
}
return out;
}
static ast_value* parser_const_float_0(parser_t *parser)
{
if (!parser->imm_float_zero)
parser->imm_float_zero = parser_const_float(parser, 0);
return parser->imm_float_zero;
}
static char *parser_strdup(const char *str)
{
if (str && !*str) {
/* actually dup empty strings */
char *out = mem_a(1);
*out = 0;
return out;
}
return util_strdup(str);
}
static ast_value* parser_const_string(parser_t *parser, const char *str)
{
size_t i;
ast_value *out;
for (i = 0; i < parser->imm_string_count; ++i) {
if (!strcmp(parser->imm_string[i]->constval.vstring, str))
return parser->imm_string[i];
}
out = ast_value_new(parser_ctx(parser), "#IMMEDIATE", TYPE_STRING);
out->isconst = true;
out->constval.vstring = parser_strdup(str);
if (!parser_t_imm_string_add(parser, out)) {
ast_value_delete(out);
return NULL;
}
return out;
}
static ast_value* parser_const_vector(parser_t *parser, vector v)
{
size_t i;
ast_value *out;
for (i = 0; i < parser->imm_vector_count; ++i) {
if (!memcmp(&parser->imm_vector[i]->constval.vvec, &v, sizeof(v)))
return parser->imm_vector[i];
}
out = ast_value_new(parser_ctx(parser), "#IMMEDIATE", TYPE_VECTOR);
out->isconst = true;
out->constval.vvec = v;
if (!parser_t_imm_vector_add(parser, out)) {
ast_value_delete(out);
return NULL;
}
return out;
}
static ast_value* parser_const_vector_f(parser_t *parser, float x, float y, float z)
{
vector v;
v.x = x;
v.y = y;
v.z = z;
return parser_const_vector(parser, v);
}
static ast_value* parser_const_vector_0(parser_t *parser)
{
if (!parser->imm_vector_zero)
parser->imm_vector_zero = parser_const_vector_f(parser, 0, 0, 0);
return parser->imm_vector_zero;
}
static ast_expression* parser_find_field(parser_t *parser, const char *name)
{
size_t i;
for (i = 0; i < parser->fields_count; ++i) {
if (!strcmp(parser->fields[i].name, name))
return parser->fields[i].var;
}
return NULL;
}
static ast_expression* parser_find_global(parser_t *parser, const char *name)
{
size_t i;
for (i = 0; i < parser->globals_count; ++i) {
if (!strcmp(parser->globals[i].name, name))
return parser->globals[i].var;
}
return NULL;
}
static ast_expression* parser_find_param(parser_t *parser, const char *name)
{
size_t i;
ast_value *fun;
if (!parser->function)
return NULL;
fun = parser->function->vtype;
for (i = 0; i < fun->expression.params_count; ++i) {
if (!strcmp(fun->expression.params[i]->name, name))
return (ast_expression*)(fun->expression.params[i]);
}
return NULL;
}
static ast_expression* parser_find_local(parser_t *parser, const char *name, size_t upto, bool *isparam)
{
size_t i;
*isparam = false;
for (i = parser->locals_count; i > upto;) {
--i;
if (!strcmp(parser->locals[i].name, name))
return parser->locals[i].var;
}
*isparam = true;
return parser_find_param(parser, name);
}
static ast_expression* parser_find_var(parser_t *parser, const char *name)
{
bool dummy;
ast_expression *v;
v = parser_find_local(parser, name, 0, &dummy);
if (!v) v = parser_find_global(parser, name);
return v;
}
typedef struct {
MEM_VECTOR_MAKE(ast_value*, p);
} paramlist_t;
MEM_VEC_FUNCTIONS(paramlist_t, ast_value*, p)
static ast_value *parse_type(parser_t *parser, int basetype, bool *isfunc)
{
paramlist_t params;
ast_value *var;
lex_ctx ctx = parser_ctx(parser);
int vtype = basetype;
int temptype;
size_t i;
bool variadic = false;
MEM_VECTOR_INIT(&params, p);
*isfunc = false;
if (parser->tok == '(') {
*isfunc = true;
while (true) {
ast_value *param;
ast_value *fld;
bool isfield = false;
bool isfuncparam = false;
if (!parser_next(parser))
goto on_error;
if (parser->tok == ')')
break;
if (parser->tok == '.') {
isfield = true;
if (!parser_next(parser)) {
parseerror(parser, "expected field parameter type");
goto on_error;
}
}
if (parser->tok == TOKEN_DOTS) {
/* variadic args */
variadic = true;
if (!parser_next(parser))
goto on_error;
if (parser->tok != ')') {
parseerror(parser, "`...` must be the last parameter of a variadic function declaration");
goto on_error;
}
if (opts_standard == COMPILER_QCC) {
if (parsewarning(parser, WARN_EXTENSIONS, "variadic functions are not available in this standard"))
goto on_error;
}
break;
}
temptype = parser_token(parser)->constval.t;
if (!parser_next(parser))
goto on_error;
param = parse_type(parser, temptype, &isfuncparam);
if (!param)
goto on_error;
if (parser->tok == TOKEN_IDENT) {
/* named parameter */
if (!ast_value_set_name(param, parser_tokval(parser)))
goto on_error;
if (!parser_next(parser))
goto on_error;
}
/* This comes before the isfield part! */
if (isfuncparam) {
ast_value *fval = ast_value_new(ast_ctx(param), param->name, TYPE_FUNCTION);
if (!fval) {
ast_delete(param);
goto on_error;
}
fval->expression.next = (ast_expression*)param;
MEM_VECTOR_MOVE(&param->expression, params, &fval->expression, params);
fval->expression.variadic = param->expression.variadic;
param = fval;
}
if (isfield) {
fld = ast_value_new(ctx, param->name, TYPE_FIELD);
fld->expression.next = (ast_expression*)param;
param = fld;
}
if (!paramlist_t_p_add(&params, param)) {
parseerror(parser, "Out of memory while parsing typename");
goto on_error;
}
if (parser->tok == ',')
continue;
if (parser->tok == ')')
break;
parseerror(parser, "Unexpected token");
goto on_error;
}
if (!parser_next(parser))
goto on_error;
}
var = ast_value_new(ctx, "<unnamed>", vtype);
if (!var)
goto on_error;
var->expression.variadic = variadic;
MEM_VECTOR_MOVE(&params, p, &var->expression, params);
return var;
on_error:
for (i = 0; i < params.p_count; ++i)
ast_value_delete(params.p[i]);
MEM_VECTOR_CLEAR(&params, p);
return NULL;
}
typedef struct
{
size_t etype; /* 0 = expression, others are operators */
int paren;
size_t off;
ast_expression *out;
ast_block *block; /* for commas and function calls */
lex_ctx ctx;
} sy_elem;
typedef struct
{
MEM_VECTOR_MAKE(sy_elem, out);
MEM_VECTOR_MAKE(sy_elem, ops);
} shunt;
MEM_VEC_FUNCTIONS(shunt, sy_elem, out)
MEM_VEC_FUNCTIONS(shunt, sy_elem, ops)
static sy_elem syexp(lex_ctx ctx, ast_expression *v) {
sy_elem e;
e.etype = 0;
e.out = v;
e.block = NULL;
e.ctx = ctx;
e.paren = 0;
return e;
}
static sy_elem syblock(lex_ctx ctx, ast_block *v) {
sy_elem e;
e.etype = 0;
e.out = (ast_expression*)v;
e.block = v;
e.ctx = ctx;
e.paren = 0;
return e;
}
static sy_elem syop(lex_ctx ctx, const oper_info *op) {
sy_elem e;
e.etype = 1 + (op - operators);
e.out = NULL;
e.block = NULL;
e.ctx = ctx;
e.paren = 0;
return e;
}
static sy_elem syparen(lex_ctx ctx, int p, size_t off) {
sy_elem e;
e.etype = 0;
e.off = off;
e.out = NULL;
e.block = NULL;
e.ctx = ctx;
e.paren = p;
return e;
}
#ifdef DEBUGSHUNT
# define DEBUGSHUNTDO(x) x
#else
# define DEBUGSHUNTDO(x)
#endif
static bool parser_sy_pop(parser_t *parser, shunt *sy)
{
const oper_info *op;
lex_ctx ctx;
ast_expression *out = NULL;
ast_expression *exprs[3];
ast_block *blocks[3];
ast_value *asvalue[3];
size_t i, assignop;
qcint generated_op = 0;
if (!sy->ops_count) {
parseerror(parser, "internal error: missing operator");
return false;
}
if (sy->ops[sy->ops_count-1].paren) {
parseerror(parser, "unmatched parenthesis");
return false;
}
op = &operators[sy->ops[sy->ops_count-1].etype - 1];
ctx = sy->ops[sy->ops_count-1].ctx;
DEBUGSHUNTDO(printf("apply %s\n", op->op));
if (sy->out_count < op->operands) {
parseerror(parser, "internal error: not enough operands: %i (operator %s (%i))", sy->out_count,
op->op, (int)op->id);
return false;
}
sy->ops_count--;
sy->out_count -= op->operands;
for (i = 0; i < op->operands; ++i) {
exprs[i] = sy->out[sy->out_count+i].out;
blocks[i] = sy->out[sy->out_count+i].block;
asvalue[i] = (ast_value*)exprs[i];
}
if (blocks[0] && !blocks[0]->exprs_count && op->id != opid1(',')) {
parseerror(parser, "internal error: operator cannot be applied on empty blocks");
return false;
}
#define NotSameType(T) \
(exprs[0]->expression.vtype != exprs[1]->expression.vtype || \
exprs[0]->expression.vtype != T)
#define CanConstFold1(A) \
(ast_istype((A), ast_value) && ((ast_value*)(A))->isconst)
#define CanConstFold(A, B) \
(CanConstFold1(A) && CanConstFold1(B))
#define ConstV(i) (asvalue[(i)]->constval.vvec)
#define ConstF(i) (asvalue[(i)]->constval.vfloat)
#define ConstS(i) (asvalue[(i)]->constval.vstring)
switch (op->id)
{
default:
parseerror(parser, "internal error: unhandled operator: %s (%i)", op->op, (int)op->id);
return false;
case opid1('.'):
if (exprs[0]->expression.vtype == TYPE_ENTITY) {
if (exprs[1]->expression.vtype != TYPE_FIELD) {
parseerror(parser, "type error: right hand of member-operand should be an entity-field");
return false;
}
out = (ast_expression*)ast_entfield_new(ctx, exprs[0], exprs[1]);
}
else if (exprs[0]->expression.vtype == TYPE_VECTOR) {
parseerror(parser, "internal error: vector access is not supposed to be handled at this point");
return false;
}
else {
parseerror(parser, "type error: member-of operator on something that is not an entity or vector");
return false;
}
break;
case opid1(','):
if (blocks[0]) {
if (!ast_block_exprs_add(blocks[0], exprs[1]))
return false;
} else {
blocks[0] = ast_block_new(ctx);
if (!ast_block_exprs_add(blocks[0], exprs[0]) ||
!ast_block_exprs_add(blocks[0], exprs[1]))
{
return false;
}
}
if (!ast_block_set_type(blocks[0], exprs[1]))
return false;
sy->out[sy->out_count++] = syblock(ctx, blocks[0]);
return true;
case opid2('-','P'):
switch (exprs[0]->expression.vtype) {
case TYPE_FLOAT:
if (CanConstFold1(exprs[0]))
out = (ast_expression*)parser_const_float(parser, -ConstF(0));
else
out = (ast_expression*)ast_binary_new(ctx, INSTR_SUB_F,
(ast_expression*)parser_const_float_0(parser),
exprs[0]);
break;
case TYPE_VECTOR:
if (CanConstFold1(exprs[0]))
out = (ast_expression*)parser_const_vector_f(parser,
-ConstV(0).x, -ConstV(0).y, -ConstV(0).z);
else
out = (ast_expression*)ast_binary_new(ctx, INSTR_SUB_V,
(ast_expression*)parser_const_vector_0(parser),
exprs[0]);
break;
default:
parseerror(parser, "invalid types used in expression: cannot negate type %s",
type_name[exprs[0]->expression.vtype]);
return false;
}
break;
case opid2('!','P'):
switch (exprs[0]->expression.vtype) {
case TYPE_FLOAT:
if (CanConstFold1(exprs[0]))
out = (ast_expression*)parser_const_float(parser, !ConstF(0));
else
out = (ast_expression*)ast_unary_new(ctx, INSTR_NOT_F, exprs[0]);
break;
case TYPE_VECTOR:
if (CanConstFold1(exprs[0]))
out = (ast_expression*)parser_const_float(parser,
(!ConstV(0).x && !ConstV(0).y && !ConstV(0).z));
else
out = (ast_expression*)ast_unary_new(ctx, INSTR_NOT_V, exprs[0]);
break;
case TYPE_STRING:
if (CanConstFold1(exprs[0]))
out = (ast_expression*)parser_const_float(parser, !ConstS(0) || !*ConstS(0));
else
out = (ast_expression*)ast_unary_new(ctx, INSTR_NOT_S, exprs[0]);
break;
/* we don't constant-fold NOT for these types */
case TYPE_ENTITY:
out = (ast_expression*)ast_unary_new(ctx, INSTR_NOT_ENT, exprs[0]);
break;
case TYPE_FUNCTION:
out = (ast_expression*)ast_unary_new(ctx, INSTR_NOT_FNC, exprs[0]);
break;
default:
parseerror(parser, "invalid types used in expression: cannot logically negate type %s",
type_name[exprs[0]->expression.vtype]);
return false;
}
break;
case opid1('+'):
if (exprs[0]->expression.vtype != exprs[1]->expression.vtype ||
(exprs[0]->expression.vtype != TYPE_VECTOR && exprs[0]->expression.vtype != TYPE_FLOAT) )
{
parseerror(parser, "invalid types used in expression: cannot add type %s and %s",
type_name[exprs[0]->expression.vtype],
type_name[exprs[1]->expression.vtype]);
return false;
}
switch (exprs[0]->expression.vtype) {
case TYPE_FLOAT:
if (CanConstFold(exprs[0], exprs[1]))
{
out = (ast_expression*)parser_const_float(parser, ConstF(0) + ConstF(1));
}
else
out = (ast_expression*)ast_binary_new(ctx, INSTR_ADD_F, exprs[0], exprs[1]);
break;
case TYPE_VECTOR:
if (CanConstFold(exprs[0], exprs[1]))
out = (ast_expression*)parser_const_vector(parser, vec3_add(ConstV(0), ConstV(1)));
else
out = (ast_expression*)ast_binary_new(ctx, INSTR_ADD_V, exprs[0], exprs[1]);
break;
default:
parseerror(parser, "invalid types used in expression: cannot add type %s and %s",
type_name[exprs[0]->expression.vtype],
type_name[exprs[1]->expression.vtype]);
return false;
};
break;
case opid1('-'):
if (exprs[0]->expression.vtype != exprs[1]->expression.vtype ||
(exprs[0]->expression.vtype != TYPE_VECTOR && exprs[0]->expression.vtype != TYPE_FLOAT) )
{
parseerror(parser, "invalid types used in expression: cannot subtract type %s from %s",
type_name[exprs[1]->expression.vtype],
type_name[exprs[0]->expression.vtype]);
return false;
}
switch (exprs[0]->expression.vtype) {
case TYPE_FLOAT:
if (CanConstFold(exprs[0], exprs[1]))
out = (ast_expression*)parser_const_float(parser, ConstF(0) - ConstF(1));
else
out = (ast_expression*)ast_binary_new(ctx, INSTR_SUB_F, exprs[0], exprs[1]);
break;
case TYPE_VECTOR:
if (CanConstFold(exprs[0], exprs[1]))
out = (ast_expression*)parser_const_vector(parser, vec3_sub(ConstV(0), ConstV(1)));
else
out = (ast_expression*)ast_binary_new(ctx, INSTR_SUB_V, exprs[0], exprs[1]);
break;
default:
parseerror(parser, "invalid types used in expression: cannot subtract type %s from %s",
type_name[exprs[1]->expression.vtype],
type_name[exprs[0]->expression.vtype]);
return false;
};
break;
case opid1('*'):
if (exprs[0]->expression.vtype != exprs[1]->expression.vtype &&
exprs[0]->expression.vtype != TYPE_VECTOR &&
exprs[0]->expression.vtype != TYPE_FLOAT &&
exprs[1]->expression.vtype != TYPE_VECTOR &&
exprs[1]->expression.vtype != TYPE_FLOAT)
{
parseerror(parser, "invalid types used in expression: cannot multiply types %s and %s",
type_name[exprs[1]->expression.vtype],
type_name[exprs[0]->expression.vtype]);
return false;
}
switch (exprs[0]->expression.vtype) {
case TYPE_FLOAT:
if (exprs[1]->expression.vtype == TYPE_VECTOR)
{
if (CanConstFold(exprs[0], exprs[1]))
out = (ast_expression*)parser_const_vector(parser, vec3_mulvf(ConstV(1), ConstF(0)));
else
out = (ast_expression*)ast_binary_new(ctx, INSTR_MUL_FV, exprs[0], exprs[1]);
}
else
{
if (CanConstFold(exprs[0], exprs[1]))
out = (ast_expression*)parser_const_float(parser, ConstF(0) * ConstF(1));
else
out = (ast_expression*)ast_binary_new(ctx, INSTR_MUL_F, exprs[0], exprs[1]);
}
break;
case TYPE_VECTOR:
if (exprs[1]->expression.vtype == TYPE_FLOAT)
{
if (CanConstFold(exprs[0], exprs[1]))
out = (ast_expression*)parser_const_vector(parser, vec3_mulvf(ConstV(0), ConstF(1)));
else
out = (ast_expression*)ast_binary_new(ctx, INSTR_MUL_VF, exprs[0], exprs[1]);
}
else
{
if (CanConstFold(exprs[0], exprs[1]))
out = (ast_expression*)parser_const_float(parser, vec3_mulvv(ConstV(0), ConstV(1)));
else
out = (ast_expression*)ast_binary_new(ctx, INSTR_MUL_V, exprs[0], exprs[1]);
}
break;
default:
parseerror(parser, "invalid types used in expression: cannot multiply types %s and %s",
type_name[exprs[1]->expression.vtype],
type_name[exprs[0]->expression.vtype]);
return false;
};
break;
case opid1('/'):
if (NotSameType(TYPE_FLOAT)) {
parseerror(parser, "invalid types used in expression: cannot divide types %s and %s",
type_name[exprs[0]->expression.vtype],
type_name[exprs[1]->expression.vtype]);
return false;
}
if (CanConstFold(exprs[0], exprs[1]))
out = (ast_expression*)parser_const_float(parser, ConstF(0) / ConstF(1));
else
out = (ast_expression*)ast_binary_new(ctx, INSTR_DIV_F, exprs[0], exprs[1]);
break;
case opid1('%'):
case opid2('%','='):
parseerror(parser, "qc does not have a modulo operator");
return false;
case opid1('|'):
case opid1('&'):
if (NotSameType(TYPE_FLOAT)) {
parseerror(parser, "invalid types used in expression: cannot perform bit operations between types %s and %s",
type_name[exprs[0]->expression.vtype],
type_name[exprs[1]->expression.vtype]);
return false;
}
if (CanConstFold(exprs[0], exprs[1]))
out = (ast_expression*)parser_const_float(parser,
(op->id == opid1('|') ? (float)( ((qcint)ConstF(0)) | ((qcint)ConstF(1)) ) :
(float)( ((qcint)ConstF(0)) & ((qcint)ConstF(1)) ) ));
else
out = (ast_expression*)ast_binary_new(ctx,
(op->id == opid1('|') ? INSTR_BITOR : INSTR_BITAND),
exprs[0], exprs[1]);
break;
case opid1('^'):
parseerror(parser, "TODO: bitxor");
return false;
case opid2('<','<'):
case opid2('>','>'):
case opid3('<','<','='):
case opid3('>','>','='):
parseerror(parser, "TODO: shifts");
return false;
case opid2('|','|'):
generated_op += 1; /* INSTR_OR */
case opid2('&','&'):
generated_op += INSTR_AND;
if (NotSameType(TYPE_FLOAT)) {
parseerror(parser, "invalid types used in expression: cannot perform logical operations between types %s and %s",
type_name[exprs[0]->expression.vtype],
type_name[exprs[1]->expression.vtype]);
parseerror(parser, "TODO: logical ops for arbitrary types using INSTR_NOT");
parseerror(parser, "TODO: optional early out");
return false;
}
if (opts_standard == COMPILER_GMQCC)
printf("TODO: early out logic\n");
if (CanConstFold(exprs[0], exprs[1]))
out = (ast_expression*)parser_const_float(parser,
(generated_op == INSTR_OR ? (ConstF(0) || ConstF(1)) : (ConstF(0) && ConstF(1))));
else
out = (ast_expression*)ast_binary_new(ctx, generated_op, exprs[0], exprs[1]);
break;
case opid1('>'):
generated_op += 1; /* INSTR_GT */
case opid1('<'):
generated_op += 1; /* INSTR_LT */
case opid2('>', '='):
generated_op += 1; /* INSTR_GE */
case opid2('<', '='):
generated_op += INSTR_LE;
if (NotSameType(TYPE_FLOAT)) {
parseerror(parser, "invalid types used in expression: cannot perform comparison between types %s and %s",
type_name[exprs[0]->expression.vtype],
type_name[exprs[1]->expression.vtype]);
return false;
}
out = (ast_expression*)ast_binary_new(ctx, generated_op, exprs[0], exprs[1]);
break;
case opid2('!', '='):
if (exprs[0]->expression.vtype != exprs[1]->expression.vtype) {
parseerror(parser, "invalid types used in expression: cannot perform comparison between types %s and %s",
type_name[exprs[0]->expression.vtype],
type_name[exprs[1]->expression.vtype]);
return false;
}
out = (ast_expression*)ast_binary_new(ctx, type_ne_instr[exprs[0]->expression.vtype], exprs[0], exprs[1]);
break;
case opid2('=', '='):
if (exprs[0]->expression.vtype != exprs[1]->expression.vtype) {
parseerror(parser, "invalid types used in expression: cannot perform comparison between types %s and %s",
type_name[exprs[0]->expression.vtype],
type_name[exprs[1]->expression.vtype]);
return false;
}
out = (ast_expression*)ast_binary_new(ctx, type_eq_instr[exprs[0]->expression.vtype], exprs[0], exprs[1]);
break;
case opid1('='):
if (ast_istype(exprs[0], ast_entfield)) {
ast_expression *field = ((ast_entfield*)exprs[0])->field;
assignop = type_storep_instr[exprs[0]->expression.vtype];
if (!ast_compare_type(field->expression.next, exprs[1])) {
char ty1[1024];
char ty2[1024];
ast_type_to_string(field->expression.next, ty1, sizeof(ty1));
ast_type_to_string(exprs[1], ty2, sizeof(ty2));
if (opts_standard == COMPILER_QCC &&
field->expression.next->expression.vtype == TYPE_FUNCTION &&
exprs[1]->expression.vtype == TYPE_FUNCTION)
{
if (parsewarning(parser, WARN_ASSIGN_FUNCTION_TYPES,
"invalid types in assignment: cannot assign %s to %s", ty2, ty1))
{
parser->errors++;
}
}
else
parseerror(parser, "invalid types in assignment: cannot assign %s to %s", ty2, ty1);
}
}
else
{
assignop = type_store_instr[exprs[0]->expression.vtype];
if (!ast_compare_type(exprs[0], exprs[1])) {
char ty1[1024];
char ty2[1024];
ast_type_to_string(exprs[0], ty1, sizeof(ty1));
ast_type_to_string(exprs[1], ty2, sizeof(ty2));
if (opts_standard == COMPILER_QCC &&
exprs[0]->expression.vtype == TYPE_FUNCTION &&
exprs[1]->expression.vtype == TYPE_FUNCTION)
{
if (parsewarning(parser, WARN_ASSIGN_FUNCTION_TYPES,
"invalid types in assignment: cannot assign %s to %s", ty2, ty1))
{
parser->errors++;
}
}
else
parseerror(parser, "invalid types in assignment: cannot assign %s to %s", ty2, ty1);
}
}
out = (ast_expression*)ast_store_new(ctx, assignop, exprs[0], exprs[1]);
break;
case opid2('+','='):
case opid2('-','='):
if (exprs[0]->expression.vtype != exprs[1]->expression.vtype ||
(exprs[0]->expression.vtype != TYPE_VECTOR && exprs[0]->expression.vtype != TYPE_FLOAT) )
{
parseerror(parser, "invalid types used in expression: cannot add or subtract type %s and %s",
type_name[exprs[0]->expression.vtype],
type_name[exprs[1]->expression.vtype]);
return false;
}
if (ast_istype(exprs[0], ast_entfield))
assignop = type_storep_instr[exprs[0]->expression.vtype];
else
assignop = type_store_instr[exprs[0]->expression.vtype];
switch (exprs[0]->expression.vtype) {
case TYPE_FLOAT:
out = (ast_expression*)ast_binstore_new(ctx, assignop,
(op->id == opid2('+','=') ? INSTR_ADD_F : INSTR_SUB_F),
exprs[0], exprs[1]);
break;
case TYPE_VECTOR:
out = (ast_expression*)ast_binstore_new(ctx, assignop,
(op->id == opid2('+','=') ? INSTR_ADD_V : INSTR_SUB_V),
exprs[0], exprs[1]);
break;
default:
parseerror(parser, "invalid types used in expression: cannot add or subtract type %s and %s",
type_name[exprs[0]->expression.vtype],
type_name[exprs[1]->expression.vtype]);
return false;
};
break;
}
#undef NotSameType
if (!out) {
parseerror(parser, "failed to apply operand %s", op->op);
return false;
}
DEBUGSHUNTDO(printf("applied %s\n", op->op));
sy->out[sy->out_count++] = syexp(ctx, out);
return true;
}
static bool parser_close_call(parser_t *parser, shunt *sy)
{
/* was a function call */
ast_expression *fun;
ast_call *call;
size_t fid;
size_t paramcount;
sy->ops_count--;
fid = sy->ops[sy->ops_count].off;
/* out[fid] is the function
* everything above is parameters...
* 0 params = nothing
* 1 params = ast_expression
* more = ast_block
*/
if (sy->out_count < 1 || sy->out_count <= fid) {
parseerror(parser, "internal error: function call needs function and parameter list...");
return false;
}
fun = sy->out[fid].out;
call = ast_call_new(sy->ops[sy->ops_count].ctx, fun);
if (!call) {
parseerror(parser, "out of memory");
return false;
}
if (fid+1 == sy->out_count) {
/* no arguments */
paramcount = 0;
} else if (fid+2 == sy->out_count) {
ast_block *params;
sy->out_count--;
params = sy->out[sy->out_count].block;
if (!params) {
/* 1 param */
paramcount = 1;
if (!ast_call_params_add(call, sy->out[sy->out_count].out)) {
ast_delete(sy->out[sy->out_count].out);
parseerror(parser, "out of memory");
return false;
}
} else {
paramcount = params->exprs_count;
MEM_VECTOR_MOVE(params, exprs, call, params);
ast_delete(params);
}
if (!ast_call_check_types(call))
parser->errors++;
} else {
parseerror(parser, "invalid function call");
return false;
}
/* overwrite fid, the function, with a call */
sy->out[fid] = syexp(call->expression.node.context, (ast_expression*)call);
if (fun->expression.vtype != TYPE_FUNCTION) {
parseerror(parser, "not a function (%s)", type_name[fun->expression.vtype]);
return false;
}
if (!fun->expression.next) {
parseerror(parser, "could not determine function return type");
return false;
} else {
if (fun->expression.params_count != paramcount &&
!(fun->expression.variadic &&
fun->expression.params_count < paramcount))
{
ast_value *fval;
const char *fewmany = (fun->expression.params_count > paramcount) ? "few" : "many";
fval = (ast_istype(fun, ast_value) ? ((ast_value*)fun) : NULL);
if (opts_standard == COMPILER_GMQCC)
{
if (fval)
parseerror(parser, "too %s parameters for call to %s: expected %i, got %i\n"
" -> `%s` has been declared here: %s:%i",
fewmany, fval->name, (int)fun->expression.params_count, (int)paramcount,
fval->name, ast_ctx(fun).file, (int)ast_ctx(fun).line);
else
parseerror(parser, "too %s parameters for function call: expected %i, got %i\n"
" -> `%s` has been declared here: %s:%i",
fewmany, fval->name, (int)fun->expression.params_count, (int)paramcount,
fval->name, ast_ctx(fun).file, (int)ast_ctx(fun).line);
return false;
}
else
{
if (fval)
return !parsewarning(parser, WARN_TOO_FEW_PARAMETERS,
"too %s parameters for call to %s: expected %i, got %i\n"
" -> `%s` has been declared here: %s:%i",
fewmany, fval->name, (int)fun->expression.params_count, (int)paramcount,
fval->name, ast_ctx(fun).file, (int)ast_ctx(fun).line);
else
return !parsewarning(parser, WARN_TOO_FEW_PARAMETERS,
"too %s parameters for function call: expected %i, got %i\n"
" -> `%s` has been declared here: %s:%i",
fewmany, fval->name, (int)fun->expression.params_count, (int)paramcount,
fval->name, ast_ctx(fun).file, (int)ast_ctx(fun).line);
}
}
}
return true;
}
static bool parser_close_paren(parser_t *parser, shunt *sy, bool functions_only)
{
if (!sy->ops_count) {
parseerror(parser, "unmatched closing paren");
return false;
}
/* this would for bit a + (x) because there are no operators inside (x)
if (sy->ops[sy->ops_count-1].paren == 1) {
parseerror(parser, "empty parenthesis expression");
return false;
}
*/
while (sy->ops_count) {
if (sy->ops[sy->ops_count-1].paren == 'f') {
if (!parser_close_call(parser, sy))
return false;
break;
}
if (sy->ops[sy->ops_count-1].paren == 1) {
sy->ops_count--;
return !functions_only;
}
if (!parser_sy_pop(parser, sy))
return false;
}
return true;
}
static void parser_reclassify_token(parser_t *parser)
{
size_t i;
for (i = 0; i < operator_count; ++i) {
if (!strcmp(parser_tokval(parser), operators[i].op)) {
parser->tok = TOKEN_OPERATOR;
return;
}
}
}
static ast_expression* parse_expression_leave(parser_t *parser, bool stopatcomma)
{
ast_expression *expr = NULL;
shunt sy;
bool wantop = false;
bool gotmemberof = false;
/* count the parens because an if starts with one, so the
* end of a condition is an unmatched closing paren
*/
int parens = 0;
MEM_VECTOR_INIT(&sy, out);
MEM_VECTOR_INIT(&sy, ops);
parser->lex->flags.noops = false;
parser_reclassify_token(parser);
while (true)
{
if (gotmemberof)
gotmemberof = false;
else
parser->memberof = 0;
if (parser->tok == TOKEN_IDENT)
{
ast_expression *var;
if (wantop) {
parseerror(parser, "expected operator or end of statement");
goto onerr;
}
wantop = true;
/* variable */
if (opts_standard == COMPILER_GMQCC)
{
if (parser->memberof == TYPE_ENTITY) {
/* still get vars first since there could be a fieldpointer */
var = parser_find_var(parser, parser_tokval(parser));
if (!var)
var = parser_find_field(parser, parser_tokval(parser));
}
else if (parser->memberof == TYPE_VECTOR)
{
parseerror(parser, "TODO: implement effective vector member access");
goto onerr;
}
else if (parser->memberof) {
parseerror(parser, "namespace for member not found");
goto onerr;
}
else
var = parser_find_var(parser, parser_tokval(parser));
} else {
var = parser_find_var(parser, parser_tokval(parser));
if (!var)
var = parser_find_field(parser, parser_tokval(parser));
}
if (!var) {
parseerror(parser, "unexpected ident: %s", parser_tokval(parser));
goto onerr;
}
if (ast_istype(var, ast_value))
((ast_value*)var)->uses++;
if (!shunt_out_add(&sy, syexp(parser_ctx(parser), var))) {
parseerror(parser, "out of memory");
goto onerr;
}
DEBUGSHUNTDO(printf("push %s\n", parser_tokval(parser)));
}
else if (parser->tok == TOKEN_FLOATCONST) {
ast_value *val;
if (wantop) {
parseerror(parser, "expected operator or end of statement, got constant");
goto onerr;
}
wantop = true;
val = parser_const_float(parser, (parser_token(parser)->constval.f));
if (!val)
return false;
if (!shunt_out_add(&sy, syexp(parser_ctx(parser), (ast_expression*)val))) {
parseerror(parser, "out of memory");
goto onerr;
}
DEBUGSHUNTDO(printf("push %g\n", parser_token(parser)->constval.f));
}
else if (parser->tok == TOKEN_INTCONST) {
ast_value *val;
if (wantop) {
parseerror(parser, "expected operator or end of statement, got constant");
goto onerr;
}
wantop = true;
val = parser_const_float(parser, (double)(parser_token(parser)->constval.i));
if (!val)
return false;
if (!shunt_out_add(&sy, syexp(parser_ctx(parser), (ast_expression*)val))) {
parseerror(parser, "out of memory");
goto onerr;
}
DEBUGSHUNTDO(printf("push %i\n", parser_token(parser)->constval.i));
}
else if (parser->tok == TOKEN_STRINGCONST) {
ast_value *val;
if (wantop) {
parseerror(parser, "expected operator or end of statement, got constant");
goto onerr;
}
wantop = true;
val = parser_const_string(parser, parser_tokval(parser));
if (!val)
return false;
if (!shunt_out_add(&sy, syexp(parser_ctx(parser), (ast_expression*)val))) {
parseerror(parser, "out of memory");
goto onerr;
}
DEBUGSHUNTDO(printf("push string\n"));
}
else if (parser->tok == TOKEN_VECTORCONST) {
ast_value *val;
if (wantop) {
parseerror(parser, "expected operator or end of statement, got constant");
goto onerr;
}
wantop = true;
val = parser_const_vector(parser, parser_token(parser)->constval.v);
if (!val)
return false;
if (!shunt_out_add(&sy, syexp(parser_ctx(parser), (ast_expression*)val))) {
parseerror(parser, "out of memory");
goto onerr;
}
DEBUGSHUNTDO(printf("push '%g %g %g'\n",
parser_token(parser)->constval.v.x,
parser_token(parser)->constval.v.y,
parser_token(parser)->constval.v.z));
}
else if (parser->tok == '(') {
parseerror(parser, "internal error: '(' should be classified as operator");
goto onerr;
}
else if (parser->tok == ')') {
if (wantop) {
DEBUGSHUNTDO(printf("do[op] )\n"));
--parens;
if (parens < 0)
break;
/* we do expect an operator next */
/* closing an opening paren */
if (!parser_close_paren(parser, &sy, false))
goto onerr;
} else {
DEBUGSHUNTDO(printf("do[nop] )\n"));
--parens;
if (parens < 0)
break;
/* allowed for function calls */
if (!parser_close_paren(parser, &sy, true))
goto onerr;
}
wantop = true;
}
else if (parser->tok != TOKEN_OPERATOR) {
if (wantop) {
parseerror(parser, "expected operator or end of statement");
goto onerr;
}
break;
}
else
{
/* classify the operator */
/* TODO: suffix operators */
const oper_info *op;
const oper_info *olast = NULL;
size_t o;
for (o = 0; o < operator_count; ++o) {
if ((!(operators[o].flags & OP_PREFIX) == wantop) &&
!(operators[o].flags & OP_SUFFIX) && /* remove this */
!strcmp(parser_tokval(parser), operators[o].op))
{
break;
}
}
if (o == operator_count) {
/* no operator found... must be the end of the statement */
break;
}
/* found an operator */
op = &operators[o];
/* when declaring variables, a comma starts a new variable */
if (op->id == opid1(',') && !parens && stopatcomma) {
/* fixup the token */
parser->tok = ',';
break;
}
if (sy.ops_count && !sy.ops[sy.ops_count-1].paren)
olast = &operators[sy.ops[sy.ops_count-1].etype-1];
while (olast && (
(op->prec < olast->prec) ||
(op->assoc == ASSOC_LEFT && op->prec <= olast->prec) ) )
{
if (!parser_sy_pop(parser, &sy))
goto onerr;
if (sy.ops_count && !sy.ops[sy.ops_count-1].paren)
olast = &operators[sy.ops[sy.ops_count-1].etype-1];
else
olast = NULL;
}
if (op->id == opid1('.') && opts_standard == COMPILER_GMQCC) {
/* for gmqcc standard: open up the namespace of the previous type */
ast_expression *prevex = sy.out[sy.out_count-1].out;
if (!prevex) {
parseerror(parser, "unexpected member operator");
goto onerr;
}
if (prevex->expression.vtype == TYPE_ENTITY)
parser->memberof = TYPE_ENTITY;
else if (prevex->expression.vtype == TYPE_VECTOR)
parser->memberof = TYPE_VECTOR;
else {
parseerror(parser, "type error: type has no members");
goto onerr;
}
gotmemberof = true;
}
if (op->id == opid1('(')) {
if (wantop) {
DEBUGSHUNTDO(printf("push [op] (\n"));
++parens;
/* we expected an operator, this is the function-call operator */
if (!shunt_ops_add(&sy, syparen(parser_ctx(parser), 'f', sy.out_count-1))) {
parseerror(parser, "out of memory");
goto onerr;
}
} else {
++parens;
if (!shunt_ops_add(&sy, syparen(parser_ctx(parser), 1, 0))) {
parseerror(parser, "out of memory");
goto onerr;
}
DEBUGSHUNTDO(printf("push [nop] (\n"));
}
wantop = false;
} else {
DEBUGSHUNTDO(printf("push operator %s\n", op->op));
if (!shunt_ops_add(&sy, syop(parser_ctx(parser), op)))
goto onerr;
wantop = false;
}
}
if (!parser_next(parser)) {
goto onerr;
}
if (parser->tok == ';' || parser->tok == ']') {
break;
}
}
while (sy.ops_count) {
if (!parser_sy_pop(parser, &sy))
goto onerr;
}
parser->lex->flags.noops = true;
if (!sy.out_count) {
parseerror(parser, "empty expression");
expr = NULL;
} else
expr = sy.out[0].out;
MEM_VECTOR_CLEAR(&sy, out);
MEM_VECTOR_CLEAR(&sy, ops);
DEBUGSHUNTDO(printf("shunt done\n"));
return expr;
onerr:
parser->lex->flags.noops = true;
MEM_VECTOR_CLEAR(&sy, out);
MEM_VECTOR_CLEAR(&sy, ops);
return NULL;
}
static ast_expression* parse_expression(parser_t *parser, bool stopatcomma)
{
ast_expression *e = parse_expression_leave(parser, stopatcomma);
if (!e)
return NULL;
if (!parser_next(parser)) {
ast_delete(e);
return NULL;
}
return e;
}
static bool parse_if(parser_t *parser, ast_block *block, ast_expression **out)
{
ast_ifthen *ifthen;
ast_expression *cond, *ontrue, *onfalse = NULL;
lex_ctx ctx = parser_ctx(parser);
/* skip the 'if' and check for opening paren */
if (!parser_next(parser) || parser->tok != '(') {
parseerror(parser, "expected 'if' condition in parenthesis");
return false;
}
/* parse into the expression */
if (!parser_next(parser)) {
parseerror(parser, "expected 'if' condition after opening paren");
return false;
}
/* parse the condition */
cond = parse_expression_leave(parser, false);
if (!cond)
return false;
/* closing paren */
if (parser->tok != ')') {
parseerror(parser, "expected closing paren after 'if' condition");
ast_delete(cond);
return false;
}
/* parse into the 'then' branch */
if (!parser_next(parser)) {
parseerror(parser, "expected statement for on-true branch of 'if'");
ast_delete(cond);
return false;
}
ontrue = parse_statement_or_block(parser);
if (!ontrue) {
ast_delete(cond);
return false;
}
/* check for an else */
if (!strcmp(parser_tokval(parser), "else")) {
/* parse into the 'else' branch */
if (!parser_next(parser)) {
parseerror(parser, "expected on-false branch after 'else'");
ast_delete(ontrue);
ast_delete(cond);
return false;
}
onfalse = parse_statement_or_block(parser);
if (!onfalse) {
ast_delete(ontrue);
ast_delete(cond);
return false;
}
}
ifthen = ast_ifthen_new(ctx, cond, ontrue, onfalse);
*out = (ast_expression*)ifthen;
return true;
}
static bool parse_while(parser_t *parser, ast_block *block, ast_expression **out)
{
ast_loop *aloop;
ast_expression *cond, *ontrue;
lex_ctx ctx = parser_ctx(parser);
/* skip the 'while' and check for opening paren */
if (!parser_next(parser) || parser->tok != '(') {
parseerror(parser, "expected 'while' condition in parenthesis");
return false;
}
/* parse into the expression */
if (!parser_next(parser)) {
parseerror(parser, "expected 'while' condition after opening paren");
return false;
}
/* parse the condition */
cond = parse_expression_leave(parser, false);
if (!cond)
return false;
/* closing paren */
if (parser->tok != ')') {
parseerror(parser, "expected closing paren after 'while' condition");
ast_delete(cond);
return false;
}
/* parse into the 'then' branch */
if (!parser_next(parser)) {
parseerror(parser, "expected while-loop body");
ast_delete(cond);
return false;
}
ontrue = parse_statement_or_block(parser);
if (!ontrue) {
ast_delete(cond);
return false;
}
aloop = ast_loop_new(ctx, NULL, cond, NULL, NULL, ontrue);
*out = (ast_expression*)aloop;
return true;
}
static bool parse_dowhile(parser_t *parser, ast_block *block, ast_expression **out)
{
ast_loop *aloop;
ast_expression *cond, *ontrue;
lex_ctx ctx = parser_ctx(parser);
/* skip the 'do' and get the body */
if (!parser_next(parser)) {
parseerror(parser, "expected loop body");
return false;
}
ontrue = parse_statement_or_block(parser);
if (!ontrue)
return false;
/* expect the "while" */
if (parser->tok != TOKEN_KEYWORD ||
strcmp(parser_tokval(parser), "while"))
{
parseerror(parser, "expected 'while' and condition");
ast_delete(ontrue);
return false;
}
/* skip the 'while' and check for opening paren */
if (!parser_next(parser) || parser->tok != '(') {
parseerror(parser, "expected 'while' condition in parenthesis");
ast_delete(ontrue);
return false;
}
/* parse into the expression */
if (!parser_next(parser)) {
parseerror(parser, "expected 'while' condition after opening paren");
ast_delete(ontrue);
return false;
}
/* parse the condition */
cond = parse_expression_leave(parser, false);
if (!cond)
return false;
/* closing paren */
if (parser->tok != ')') {
parseerror(parser, "expected closing paren after 'while' condition");
ast_delete(ontrue);
ast_delete(cond);
return false;
}
/* parse on */
if (!parser_next(parser) || parser->tok != ';') {
parseerror(parser, "expected semicolon after condition");
ast_delete(ontrue);
ast_delete(cond);
return false;
}
if (!parser_next(parser)) {
parseerror(parser, "parse error");
ast_delete(ontrue);
ast_delete(cond);
return false;
}
aloop = ast_loop_new(ctx, NULL, NULL, cond, NULL, ontrue);
*out = (ast_expression*)aloop;
return true;
}
static bool parse_for(parser_t *parser, ast_block *block, ast_expression **out)
{
ast_loop *aloop;
ast_expression *initexpr, *cond, *increment, *ontrue;
size_t oldblocklocal;
bool retval = true;
lex_ctx ctx = parser_ctx(parser);
oldblocklocal = parser->blocklocal;
parser->blocklocal = parser->locals_count;
initexpr = NULL;
cond = NULL;
increment = NULL;
ontrue = NULL;
/* skip the 'while' and check for opening paren */
if (!parser_next(parser) || parser->tok != '(') {
parseerror(parser, "expected 'for' expressions in parenthesis");
goto onerr;
}
/* parse into the expression */
if (!parser_next(parser)) {
parseerror(parser, "expected 'for' initializer after opening paren");
goto onerr;
}
if (parser->tok == TOKEN_TYPENAME) {
if (opts_standard != COMPILER_GMQCC) {
if (parsewarning(parser, WARN_EXTENSIONS,
"current standard does not allow variable declarations in for-loop initializers"))
goto onerr;
}
parseerror(parser, "TODO: assignment of new variables to be non-const");
goto onerr;
if (!parse_variable(parser, block))
goto onerr;
}
else if (parser->tok != ';')
{
initexpr = parse_expression_leave(parser, false);
if (!initexpr)
goto onerr;
}
/* move on to condition */
if (parser->tok != ';') {
parseerror(parser, "expected semicolon after for-loop initializer");
goto onerr;
}
if (!parser_next(parser)) {
parseerror(parser, "expected for-loop condition");
goto onerr;
}
/* parse the condition */
if (parser->tok != ';') {
cond = parse_expression_leave(parser, false);
if (!cond)
goto onerr;
}
/* move on to incrementor */
if (parser->tok != ';') {
parseerror(parser, "expected semicolon after for-loop initializer");
goto onerr;
}
if (!parser_next(parser)) {
parseerror(parser, "expected for-loop condition");
goto onerr;
}
/* parse the incrementor */
if (parser->tok != ')') {
increment = parse_expression_leave(parser, false);
if (!increment)
goto onerr;
if (!ast_istype(increment, ast_store) &&
!ast_istype(increment, ast_call) &&
!ast_istype(increment, ast_binstore))
{
if (genwarning(ast_ctx(increment), WARN_EFFECTLESS_STATEMENT, "statement has no effect"))
goto onerr;
}
}
/* closing paren */
if (parser->tok != ')') {
parseerror(parser, "expected closing paren after 'for-loop' incrementor");
goto onerr;
}
/* parse into the 'then' branch */
if (!parser_next(parser)) {
parseerror(parser, "expected for-loop body");
goto onerr;
}
ontrue = parse_statement_or_block(parser);
if (!ontrue) {
goto onerr;
}
aloop = ast_loop_new(ctx, initexpr, cond, NULL, increment, ontrue);
*out = (ast_expression*)aloop;
while (parser->locals_count > parser->blocklocal)
retval = retval && parser_pop_local(parser);
parser->blocklocal = oldblocklocal;
return retval;
onerr:
if (initexpr) ast_delete(initexpr);
if (cond) ast_delete(cond);
if (increment) ast_delete(increment);
while (parser->locals_count > parser->blocklocal)
(void)!parser_pop_local(parser);
parser->blocklocal = oldblocklocal;
return false;
}
static bool parse_statement(parser_t *parser, ast_block *block, ast_expression **out)
{
if (parser->tok == TOKEN_TYPENAME)
{
/* local variable */
if (!block) {
parseerror(parser, "cannot declare a variable from here");
return false;
}
if (opts_standard == COMPILER_QCC) {
if (parsewarning(parser, WARN_EXTENSIONS, "missing 'local' keyword when declaring a local variable"))
return false;
}
if (!parse_variable(parser, block))
return false;
*out = NULL;
return true;
}
else if (parser->tok == TOKEN_KEYWORD)
{
if (!strcmp(parser_tokval(parser), "local"))
{
if (!block) {
parseerror(parser, "cannot declare a local variable here");
return false;
}
if (!parser_next(parser)) {
parseerror(parser, "expected variable declaration");
return false;
}
if (!parse_variable(parser, block))
return false;
*out = NULL;
return true;
}
else if (!strcmp(parser_tokval(parser), "return"))
{
ast_expression *exp = NULL;
ast_return *ret = NULL;
ast_value *expected = parser->function->vtype;
if (!parser_next(parser)) {
parseerror(parser, "expected return expression");
return false;
}
if (parser->tok != ';') {
exp = parse_expression(parser, false);
if (!exp)
return false;
if (exp->expression.vtype != expected->expression.next->expression.vtype) {
parseerror(parser, "return with invalid expression");
}
ret = ast_return_new(exp->expression.node.context, exp);
if (!ret) {
ast_delete(exp);
return false;
}
} else {
if (!parser_next(parser))
parseerror(parser, "parse error");
if (expected->expression.next->expression.vtype != TYPE_VOID) {
if (opts_standard != COMPILER_GMQCC)
(void)!parsewarning(parser, WARN_MISSING_RETURN_VALUES, "return without value");
else
parseerror(parser, "return without value");
}
ret = ast_return_new(parser_ctx(parser), NULL);
}
*out = (ast_expression*)ret;
return true;
}
else if (!strcmp(parser_tokval(parser), "if"))
{
return parse_if(parser, block, out);
}
else if (!strcmp(parser_tokval(parser), "while"))
{
return parse_while(parser, block, out);
}
else if (!strcmp(parser_tokval(parser), "do"))
{
return parse_dowhile(parser, block, out);
}
else if (!strcmp(parser_tokval(parser), "for"))
{
if (opts_standard == COMPILER_QCC) {
if (parsewarning(parser, WARN_EXTENSIONS, "for loops are not recognized in the original Quake C standard, to enable try an alternate standard --std=?"))
return false;
}
return parse_for(parser, block, out);
}
parseerror(parser, "Unexpected keyword");
return false;
}
else if (parser->tok == '{')
{
ast_block *inner;
inner = parse_block(parser, false);
if (!inner)
return false;
*out = (ast_expression*)inner;
return true;
}
else
{
ast_expression *exp = parse_expression(parser, false);
if (!exp)
return false;
*out = exp;
if (!ast_istype(exp, ast_store) &&
!ast_istype(exp, ast_call) &&
!ast_istype(exp, ast_binstore))
{
if (genwarning(ast_ctx(exp), WARN_EFFECTLESS_STATEMENT, "statement has no effect"))
return false;
}
return true;
}
}
static bool GMQCC_WARN parser_pop_local(parser_t *parser)
{
varentry_t *ve;
parser->locals_count--;
ve = &parser->locals[parser->locals_count];
if (ast_istype(ve->var, ast_value) && !(((ast_value*)(ve->var))->uses)) {
if (parsewarning(parser, WARN_UNUSED_VARIABLE, "unused variable: `%s`", ve->name))
return false;
}
mem_d(parser->locals[parser->locals_count].name);
return true;
}
static bool parse_block_into(parser_t *parser, ast_block *block, bool warnreturn)
{
size_t oldblocklocal;
bool retval = true;
oldblocklocal = parser->blocklocal;
parser->blocklocal = parser->locals_count;
if (!parser_next(parser)) { /* skip the '{' */
parseerror(parser, "expected function body");
goto cleanup;
}
while (parser->tok != TOKEN_EOF && parser->tok < TOKEN_ERROR)
{
ast_expression *expr;
if (parser->tok == '}')
break;
if (!parse_statement(parser, block, &expr)) {
/* parseerror(parser, "parse error"); */
block = NULL;
goto cleanup;
}
if (!expr)
continue;
if (!ast_block_exprs_add(block, expr)) {
ast_delete(expr);
block = NULL;
goto cleanup;
}
}
if (parser->tok != '}') {
block = NULL;
} else {
if (warnreturn && parser->function->vtype->expression.next->expression.vtype != TYPE_VOID)
{
if (!block->exprs_count ||
!ast_istype(block->exprs[block->exprs_count-1], ast_return))
{
if (parsewarning(parser, WARN_MISSING_RETURN_VALUES, "control reaches end of non-void function")) {
block = NULL;
goto cleanup;
}
}
}
(void)parser_next(parser);
}
cleanup:
while (parser->locals_count > parser->blocklocal)
retval = retval && parser_pop_local(parser);
parser->blocklocal = oldblocklocal;
return !!block;
}
static ast_block* parse_block(parser_t *parser, bool warnreturn)
{
ast_block *block;
block = ast_block_new(parser_ctx(parser));
if (!block)
return NULL;
if (!parse_block_into(parser, block, warnreturn)) {
ast_block_delete(block);
return NULL;
}
return block;
}
static ast_expression* parse_statement_or_block(parser_t *parser)
{
ast_expression *expr = NULL;
if (parser->tok == '{')
return (ast_expression*)parse_block(parser, false);
if (!parse_statement(parser, NULL, &expr))
return NULL;
return expr;
}
/* loop method */
static bool create_vector_members(parser_t *parser, ast_value *var, varentry_t *ve)
{
size_t i;
size_t len = strlen(var->name);
for (i = 0; i < 3; ++i) {
ve[i].var = (ast_expression*)ast_member_new(ast_ctx(var), (ast_expression*)var, i);
if (!ve[i].var)
break;
ve[i].name = (char*)mem_a(len+3);
if (!ve[i].name) {
ast_delete(ve[i].var);
break;
}
memcpy(ve[i].name, var->name, len);
ve[i].name[len] = '_';
ve[i].name[len+1] = 'x'+i;
ve[i].name[len+2] = 0;
}
if (i == 3)
return true;
/* unroll */
do {
--i;
mem_d(ve[i].name);
ast_delete(ve[i].var);
ve[i].name = NULL;
ve[i].var = NULL;
} while (i);
return false;
}
static bool parse_function_body(parser_t *parser, ast_value *var)
{
ast_block *block = NULL;
ast_function *func;
ast_function *old;
size_t parami;
ast_expression *framenum = NULL;
ast_expression *nextthink = NULL;
/* None of the following have to be deleted */
ast_expression *fld_think, *fld_nextthink, *fld_frame;
ast_expression *gbl_time, *gbl_self;
bool has_frame_think;
bool retval = true;
has_frame_think = false;
old = parser->function;
if (var->expression.variadic) {
if (parsewarning(parser, WARN_VARIADIC_FUNCTION,
"variadic function with implementation will not be able to access additional parameters"))
{
return false;
}
}
if (parser->tok == '[') {
/* got a frame definition: [ framenum, nextthink ]
* this translates to:
* self.frame = framenum;
* self.nextthink = time + 0.1;
* self.think = nextthink;
*/
nextthink = NULL;
fld_think = parser_find_field(parser, "think");
fld_nextthink = parser_find_field(parser, "nextthink");
fld_frame = parser_find_field(parser, "frame");
if (!fld_think || !fld_nextthink || !fld_frame) {
parseerror(parser, "cannot use [frame,think] notation without the required fields");
parseerror(parser, "please declare the following entityfields: `frame`, `think`, `nextthink`");
return false;
}
gbl_time = parser_find_global(parser, "time");
gbl_self = parser_find_global(parser, "self");
if (!gbl_time || !gbl_self) {
parseerror(parser, "cannot use [frame,think] notation without the required globals");
parseerror(parser, "please declare the following globals: `time`, `self`");
return false;
}
if (!parser_next(parser))
return false;
framenum = parse_expression_leave(parser, true);
if (!framenum) {
parseerror(parser, "expected a framenumber constant in[frame,think] notation");
return false;
}
if (!ast_istype(framenum, ast_value) || !( (ast_value*)framenum )->isconst) {
ast_unref(framenum);
parseerror(parser, "framenumber in [frame,think] notation must be a constant");
return false;
}
if (parser->tok != ',') {
ast_unref(framenum);
parseerror(parser, "expected comma after frame number in [frame,think] notation");
parseerror(parser, "Got a %i\n", parser->tok);
return false;
}
if (!parser_next(parser)) {
ast_unref(framenum);
return false;
}
if (parser->tok == TOKEN_IDENT && !parser_find_var(parser, parser_tokval(parser)))
{
/* qc allows the use of not-yet-declared functions here
* - this automatically creates a prototype */
varentry_t varent;
ast_value *thinkfunc;
ast_expression *functype = fld_think->expression.next;
thinkfunc = ast_value_new(parser_ctx(parser), parser_tokval(parser), functype->expression.vtype);
if (!thinkfunc || !ast_type_adopt(thinkfunc, functype)) {
ast_unref(framenum);
parseerror(parser, "failed to create implicit prototype for `%s`", parser_tokval(parser));
return false;
}
if (!parser_next(parser)) {
ast_unref(framenum);
ast_delete(thinkfunc);
return false;
}
varent.var = (ast_expression*)thinkfunc;
varent.name = util_strdup(thinkfunc->name);
if (!parser_t_globals_add(parser, varent)) {
ast_unref(framenum);
ast_delete(thinkfunc);
return false;
}
nextthink = (ast_expression*)thinkfunc;
} else {
nextthink = parse_expression_leave(parser, true);
if (!nextthink) {
ast_unref(framenum);
parseerror(parser, "expected a think-function in [frame,think] notation");
return false;
}
}
if (!ast_istype(nextthink, ast_value)) {
parseerror(parser, "think-function in [frame,think] notation must be a constant");
retval = false;
}
if (retval && parser->tok != ']') {
parseerror(parser, "expected closing `]` for [frame,think] notation");
retval = false;
}
if (retval && !parser_next(parser)) {
retval = false;
}
if (retval && parser->tok != '{') {
parseerror(parser, "a function body has to be declared after a [frame,think] declaration");
retval = false;
}
if (!retval) {
ast_unref(nextthink);
ast_unref(framenum);
return false;
}
has_frame_think = true;
}
block = ast_block_new(parser_ctx(parser));
if (!block) {
parseerror(parser, "failed to allocate block");
if (has_frame_think) {
ast_unref(nextthink);
ast_unref(framenum);
}
return false;
}
if (has_frame_think) {
lex_ctx ctx;
ast_expression *self_frame;
ast_expression *self_nextthink;
ast_expression *self_think;
ast_expression *time_plus_1;
ast_store *store_frame;
ast_store *store_nextthink;
ast_store *store_think;
ctx = parser_ctx(parser);
self_frame = (ast_expression*)ast_entfield_new(ctx, gbl_self, fld_frame);
self_nextthink = (ast_expression*)ast_entfield_new(ctx, gbl_self, fld_nextthink);
self_think = (ast_expression*)ast_entfield_new(ctx, gbl_self, fld_think);
time_plus_1 = (ast_expression*)ast_binary_new(ctx, INSTR_ADD_F,
gbl_time, (ast_expression*)parser_const_float(parser, 0.1));
if (!self_frame || !self_nextthink || !self_think || !time_plus_1) {
if (self_frame) ast_delete(self_frame);
if (self_nextthink) ast_delete(self_nextthink);
if (self_think) ast_delete(self_think);
if (time_plus_1) ast_delete(time_plus_1);
retval = false;
}
if (retval)
{
store_frame = ast_store_new(ctx, INSTR_STOREP_F, self_frame, framenum);
store_nextthink = ast_store_new(ctx, INSTR_STOREP_F, self_nextthink, time_plus_1);
store_think = ast_store_new(ctx, INSTR_STOREP_FNC, self_think, nextthink);
if (!store_frame) {
ast_delete(self_frame);
retval = false;
}
if (!store_nextthink) {
ast_delete(self_nextthink);
retval = false;
}
if (!store_think) {
ast_delete(self_think);
retval = false;
}
if (!retval) {
if (store_frame) ast_delete(store_frame);
if (store_nextthink) ast_delete(store_nextthink);
if (store_think) ast_delete(store_think);
retval = false;
}
if (retval && !ast_block_exprs_add(block, (ast_expression*)store_frame)) {
ast_delete(store_frame);
ast_delete(store_nextthink);
ast_delete(store_think);
retval = false;
}
if (retval && !ast_block_exprs_add(block, (ast_expression*)store_nextthink)) {
ast_delete(store_nextthink);
ast_delete(store_think);
retval = false;
}
if (retval && !ast_block_exprs_add(block, (ast_expression*)store_think) )
{
ast_delete(store_think);
retval = false;
}
}
if (!retval) {
parseerror(parser, "failed to generate code for [frame,think]");
ast_unref(nextthink);
ast_unref(framenum);
ast_delete(block);
return false;
}
}
for (parami = 0; parami < var->expression.params_count; ++parami) {
size_t e;
varentry_t ve[3];
ast_value *param = var->expression.params[parami];
if (param->expression.vtype != TYPE_VECTOR &&
(param->expression.vtype != TYPE_FIELD ||
param->expression.next->expression.vtype != TYPE_VECTOR))
{
continue;
}
if (!create_vector_members(parser, param, ve)) {
ast_block_delete(block);
return false;
}
for (e = 0; e < 3; ++e) {
if (!parser_t_locals_add(parser, ve[e]))
break;
if (!ast_block_collect(block, ve[e].var)) {
parser->locals_count--;
break;
}
ve[e].var = NULL; /* collected */
}
if (e != e) {
parser->locals -= e;
do {
mem_d(ve[e].name);
--e;
} while (e);
ast_block_delete(block);
return false;
}
}
func = ast_function_new(ast_ctx(var), var->name, var);
if (!func) {
parseerror(parser, "failed to allocate function for `%s`", var->name);
ast_block_delete(block);
goto enderr;
}
if (!parser_t_functions_add(parser, func)) {
parseerror(parser, "failed to allocate slot for function `%s`", var->name);
ast_block_delete(block);
goto enderrfn;
}
parser->function = func;
if (!parse_block_into(parser, block, true)) {
ast_block_delete(block);
goto enderrfn2;
}
if (!ast_function_blocks_add(func, block)) {
ast_block_delete(block);
goto enderrfn2;
}
parser->function = old;
while (parser->locals_count)
retval = retval && parser_pop_local(parser);
if (parser->tok == ';')
return parser_next(parser);
else if (opts_standard == COMPILER_QCC)
parseerror(parser, "missing semicolon after function body (mandatory with -std=qcc)");
return retval;
enderrfn2:
parser->functions_count--;
enderrfn:
ast_function_delete(func);
var->constval.vfunc = NULL;
enderr:
while (parser->locals_count) {
parser->locals_count--;
mem_d(parser->locals[parser->locals_count].name);
}
parser->function = old;
return false;
}
static bool parse_variable(parser_t *parser, ast_block *localblock)
{
bool isfunc = false;
lex_ctx ctx;
ast_value *var = NULL;
bool cleanvar = false;
varentry_t varent;
varentry_t ve[3];
ast_expression *olddecl;
ast_value *typevar;
bool hadproto;
bool isparam;
bool retval = true;
/* go */
int basetype = parser_token(parser)->constval.t;
if (!parser_next(parser)) {
parseerror(parser, "expected variable definition");
return false;
}
typevar = parse_type(parser, basetype, &isfunc);
if (!typevar)
return false;
while (true)
{
hadproto = false;
olddecl = NULL;
isparam = false;
varent.name = NULL;
ve[0].name = ve[1].name = ve[2].name = NULL;
ve[0].var = ve[1].var = ve[2].var = NULL;
ctx = parser_ctx(parser);
var = ast_value_copy(typevar);
cleanvar = true;
if (!var) {
parseerror(parser, "failed to create variable");
retval = false;
goto cleanup;
}
if (parser->tok != TOKEN_IDENT) {
parseerror(parser, "expected variable name");
retval = false;
goto cleanup;
}
if (!localblock) {
if (!strcmp(parser_tokval(parser), "end_sys_globals"))
parser->crc_globals = parser->globals_count;
else if (!strcmp(parser_tokval(parser), "end_sys_fields"))
parser->crc_fields = parser->fields_count;
}
if (!isfunc) {
if (!localblock && (olddecl = parser_find_global(parser, parser_tokval(parser)))) {
parseerror(parser, "global `%s` already declared here: %s:%i",
parser_tokval(parser), ast_ctx(olddecl).file, (int)ast_ctx(olddecl).line);
retval = false;
goto cleanup;
}
if (localblock) {
olddecl = parser_find_local(parser, parser_tokval(parser), parser->blocklocal, &isparam);
if (opts_standard == COMPILER_GMQCC)
{
if (olddecl)
{
if (!isparam) {
parseerror(parser, "local `%s` already declared here: %s:%i",
parser_tokval(parser), ast_ctx(olddecl).file, (int)ast_ctx(olddecl).line);
retval = false;
goto cleanup;
}
}
if( (!isparam && olddecl) ||
(olddecl = parser_find_local(parser, parser_tokval(parser), 0, &isparam))
)
{
if (parsewarning(parser, WARN_LOCAL_SHADOWS,
"local `%s` is shadowing a parameter", parser_tokval(parser)))
{
parseerror(parser, "local `%s` already declared here: %s:%i",
parser_tokval(parser), ast_ctx(olddecl).file, (int)ast_ctx(olddecl).line);
retval = false;
goto cleanup;
}
}
}
else
{
if (olddecl)
{
ast_value_delete(var);
var = NULL;
if (isparam &&
parsewarning(parser, WARN_LOCAL_SHADOWS,
"a parameter is shadowing local `%s`", parser_tokval(parser)))
{
retval = false;
goto cleanup;
}
else if (!isparam)
{
parseerror(parser, "local `%s` already declared here: %s:%i",
parser_tokval(parser), ast_ctx(olddecl).file, (int)ast_ctx(olddecl).line);
retval = false;
goto cleanup;
}
goto nextvar;
}
}
}
}
if (!ast_value_set_name(var, parser_tokval(parser))) {
parseerror(parser, "failed to set variable name\n");
retval = false;
goto cleanup;
}
if (isfunc) {
/* a function was defined */
ast_value *fval;
ast_value *proto = NULL;
bool dummy;
if (!localblock)
olddecl = parser_find_global(parser, parser_tokval(parser));
else
olddecl = parser_find_local(parser, parser_tokval(parser), parser->blocklocal, &dummy);
if (olddecl) {
/* we had a prototype */
if (!ast_istype(olddecl, ast_value)) {
/* vector v;
* void() v_x = {}
*/
parseerror(parser, "cannot declare a function with the same name as a vector's member: %s",
parser_tokval(parser));
retval = false;
goto cleanup;
}
proto = (ast_value*)olddecl;
}
/* turn var into a value of TYPE_FUNCTION, with the old var
* as return type
*/
fval = ast_value_new(ctx, var->name, TYPE_FUNCTION);
if (!fval) {
retval = false;
goto cleanup;
}
fval->expression.next = (ast_expression*)var;
MEM_VECTOR_MOVE(&var->expression, params, &fval->expression, params);
fval->expression.variadic = var->expression.variadic;
var = NULL;
/* we compare the type late here, but it's easier than
* messing with the parameter-vector etc. earlier
*/
if (proto) {
size_t param;
if (!ast_compare_type((ast_expression*)proto, (ast_expression*)fval)) {
parseerror(parser, "conflicting types for `%s`, previous declaration was here: %s:%i",
proto->name,
ast_ctx(proto).file, ast_ctx(proto).line);
ast_value_delete(fval);
retval = false;
goto cleanup;
}
/* copy over the parameter names */
for (param = 0; param < fval->expression.params_count; ++param)
ast_value_set_name(proto->expression.params[param], fval->expression.params[param]->name);
/* copy the new context */
ast_ctx(proto) = ast_ctx(fval);
/* now ditch the rest of the new data */
ast_value_delete(fval);
fval = proto;
hadproto = true;
}
var = fval;
}
if (!hadproto) {
varent.name = util_strdup(var->name);
varent.var = (ast_expression*)var;
if (!localblock) {
if (!(retval = parser_t_globals_add(parser, varent)))
goto cleanup;
} else {
if (!(retval = parser_t_locals_add(parser, varent)))
goto cleanup;
if (!(retval = ast_block_locals_add(localblock, var))) {
parser->locals_count--;
goto cleanup;
}
}
if (var->expression.vtype == TYPE_VECTOR)
{
size_t e;
if (!create_vector_members(parser, var, ve)) {
retval = false;
goto cleanup;
}
if (!localblock) {
for (e = 0; e < 3; ++e) {
if (!(retval = parser_t_globals_add(parser, ve[e])))
break;
}
if (!retval) {
parser->globals_count -= e+1;
goto cleanup;
}
} else {
for (e = 0; e < 3; ++e) {
if (!(retval = parser_t_locals_add(parser, ve[e])))
break;
if (!(retval = ast_block_collect(localblock, ve[e].var)))
break;
ve[e].var = NULL; /* from here it's being collected in the block */
}
if (!retval) {
parser->locals_count -= e+1;
localblock->locals_count--;
goto cleanup;
}
}
ve[0].name = ve[1].name = ve[2].name = NULL;
ve[0].var = ve[1].var = ve[2].var = NULL;
}
cleanvar = false;
varent.name = NULL;
}
nextvar:
if (!(retval = parser_next(parser)))
goto cleanup;
if (parser->tok == ';') {
ast_value_delete(typevar);
return parser_next(parser);
}
if (parser->tok == ',') {
/* another var */
if (!(retval = parser_next(parser)))
goto cleanup;
continue;
}
/* NOTE: only 'typevar' needs to be deleted from here on, so 'cleanup' won't be used
* to avoid having too many gotos
*/
if (localblock && opts_standard == COMPILER_QCC) {
if (parsewarning(parser, WARN_LOCAL_CONSTANTS,
"initializing expression turns variable `%s` into a constant in this standard",
var->name) )
{
ast_value_delete(typevar);
return false;
}
}
if (parser->tok != '=') {
if (opts_standard == COMPILER_QCC)
parseerror(parser, "missing semicolon");
else
parseerror(parser, "missing semicolon or initializer");
ast_value_delete(typevar);
return false;
}
if (!parser_next(parser)) {
ast_value_delete(typevar);
return false;
}
if (parser->tok == '#') {
ast_function *func;
if (localblock) {
parseerror(parser, "cannot declare builtins within functions");
ast_value_delete(typevar);
return false;
}
if (!isfunc) {
parseerror(parser, "unexpected builtin number, '%s' is not a function", var->name);
ast_value_delete(typevar);
return false;
}
if (!parser_next(parser)) {
parseerror(parser, "expected builtin number");
ast_value_delete(typevar);
return false;
}
if (parser->tok != TOKEN_INTCONST) {
parseerror(parser, "builtin number must be an integer constant");
ast_value_delete(typevar);
return false;
}
if (parser_token(parser)->constval.i <= 0) {
parseerror(parser, "builtin number must be positive integer greater than zero");
ast_value_delete(typevar);
return false;
}
func = ast_function_new(ast_ctx(var), var->name, var);
if (!func) {
parseerror(parser, "failed to allocate function for `%s`", var->name);
ast_value_delete(typevar);
return false;
}
if (!parser_t_functions_add(parser, func)) {
parseerror(parser, "failed to allocate slot for function `%s`", var->name);
ast_function_delete(func);
var->constval.vfunc = NULL;
ast_value_delete(typevar);
return false;
}
func->builtin = -parser_token(parser)->constval.i;
if (!parser_next(parser)) {
ast_value_delete(typevar);
return false;
}
}
else if (parser->tok == '{' || parser->tok == '[')
{
ast_value_delete(typevar);
if (localblock) {
parseerror(parser, "cannot declare functions within functions");
return false;
}
if (!parse_function_body(parser, var)) {
return false;
}
return true;
} else {
ast_expression *cexp;
ast_value *cval;
cexp = parse_expression_leave(parser, true);
if (!cexp) {
ast_value_delete(typevar);
return false;
}
cval = (ast_value*)cexp;
if (!ast_istype(cval, ast_value) || !cval->isconst)
parseerror(parser, "cannot initialize a global constant variable with a non-constant expression");
else
{
var->isconst = true;
if (cval->expression.vtype == TYPE_STRING)
var->constval.vstring = parser_strdup(cval->constval.vstring);
else
memcpy(&var->constval, &cval->constval, sizeof(var->constval));
ast_unref(cval);
}
}
if (parser->tok == ',') {
/* another */
continue;
}
if (parser->tok != ';') {
parseerror(parser, "missing semicolon");
ast_value_delete(typevar);
return false;
}
(void)parser_next(parser);
ast_value_delete(typevar);
return true;
}
cleanup:
ast_delete(typevar);
if (var && cleanvar) ast_delete(var);
if (varent.name) mem_d(varent.name);
if (ve[0].name) mem_d(ve[0].name);
if (ve[1].name) mem_d(ve[1].name);
if (ve[2].name) mem_d(ve[2].name);
if (ve[0].var) mem_d(ve[0].var);
if (ve[1].var) mem_d(ve[1].var);
if (ve[2].var) mem_d(ve[2].var);
return retval;
}
static bool parser_global_statement(parser_t *parser)
{
if (parser->tok == TOKEN_TYPENAME)
{
return parse_variable(parser, NULL);
}
else if (parser->tok == TOKEN_KEYWORD)
{
/* handle 'var' and 'const' */
return false;
}
else if (parser->tok == '.')
{
ast_value *var;
ast_value *typevar;
ast_value *fld;
ast_expression *oldex;
bool isfunc = false;
int basetype;
lex_ctx ctx = parser_ctx(parser);
varentry_t varent;
/* entity-member declaration */
if (!parser_next(parser) || parser->tok != TOKEN_TYPENAME) {
parseerror(parser, "expected member variable definition");
return false;
}
/* remember the base/return type */
basetype = parser_token(parser)->constval.t;
/* parse into the declaration */
if (!parser_next(parser)) {
parseerror(parser, "expected field definition");
return false;
}
/* parse the field type fully */
typevar = var = parse_type(parser, basetype, &isfunc);
if (!var)
return false;
while (true) {
var = ast_value_copy(typevar);
/* now the field name */
if (parser->tok != TOKEN_IDENT) {
parseerror(parser, "expected field name");
ast_delete(var);
return false;
}
/* check for an existing field
* in original qc we also have to check for an existing
* global named like the field
*/
if (opts_standard == COMPILER_QCC) {
if (parser_find_global(parser, parser_tokval(parser))) {
parseerror(parser, "cannot declare a field and a global of the same name with -std=qcc");
ast_delete(var);
return false;
}
}
if (isfunc) {
ast_value *fval;
fval = ast_value_new(ctx, var->name, TYPE_FUNCTION);
if (!fval) {
ast_value_delete(var);
return false;
}
fval->expression.next = (ast_expression*)var;
MEM_VECTOR_MOVE(&var->expression, params, &fval->expression, params);
fval->expression.variadic = var->expression.variadic;
var = fval;
}
if (!strcmp(parser_tokval(parser), "end_sys_fields")) {
if (parsewarning(parser, WARN_END_SYS_FIELDS, "by convention end_sys_fields should be declared as global, rather than a field")) {
ast_value_delete(var);
return false;
}
}
/* turn it into a field */
fld = ast_value_new(ctx, parser_tokval(parser), TYPE_FIELD);
fld->expression.next = (ast_expression*)var;
if ( (oldex = parser_find_field(parser, parser_tokval(parser)))) {
if (ast_istype(oldex, ast_member)) {
parseerror(parser, "cannot declare a field with the same name as a vector component, component %s has been declared here: %s:%i",
parser_tokval(parser), ast_ctx(oldex).file, (int)ast_ctx(oldex).line);
ast_delete(fld);
return false;
}
if (!ast_istype(oldex, ast_value)) {
/* not possible / sanity check */
parseerror(parser, "internal error: %s is not an ast_value", parser_tokval(parser));
ast_delete(fld);
return false;
}
if (!ast_compare_type(oldex, (ast_expression*)fld)) {
parseerror(parser, "field %s has previously been declared with a different type here: %s:%i",
parser_tokval(parser), ast_ctx(oldex).file, (int)ast_ctx(oldex).line);
ast_delete(fld);
return false;
} else {
if (parsewarning(parser, WARN_FIELD_REDECLARED, "field `%s` has already been declared here: %s:%i",
parser_tokval(parser), ast_ctx(oldex).file, (int)ast_ctx(oldex).line))
{
ast_delete(fld);
return false;
}
}
ast_delete(fld);
goto nextfield;
}
varent.var = (ast_expression*)fld;
varent.name = util_strdup(fld->name);
(void)!parser_t_fields_add(parser, varent);
if (var->expression.vtype == TYPE_VECTOR)
{
/* create _x, _y and _z fields as well */
varentry_t ve[3];
if (!create_vector_members(parser, fld, ve)) {
ast_delete(fld);
return false;
}
(void)!parser_t_fields_add(parser, ve[0]);
(void)!parser_t_fields_add(parser, ve[1]);
(void)!parser_t_fields_add(parser, ve[2]);
}
nextfield:
if (!parser_next(parser)) {
parseerror(parser, "expected semicolon or another field name");
return false;
}
if (parser->tok == ';')
break;
if (parser->tok != ',' || !parser_next(parser)) {
parseerror(parser, "expected semicolon or another field name");
return false;
}
}
ast_delete(typevar);
/* skip the semicolon */
if (!parser_next(parser))
return parser->tok == TOKEN_EOF;
return true;
}
else if (parser->tok == '$')
{
if (!parser_next(parser)) {
parseerror(parser, "parse error");
return false;
}
}
else
{
parseerror(parser, "unexpected token: %s", parser->lex->tok.value);
return false;
}
return true;
}
static parser_t *parser;
bool parser_init()
{
parser = (parser_t*)mem_a(sizeof(parser_t));
if (!parser)
return false;
memset(parser, 0, sizeof(*parser));
return true;
}
bool parser_compile(const char *filename)
{
parser->lex = lex_open(filename);
if (!parser->lex) {
printf("failed to open file \"%s\"\n", filename);
return false;
}
/* initial lexer/parser state */
parser->lex->flags.noops = true;
if (parser_next(parser))
{
while (parser->tok != TOKEN_EOF && parser->tok < TOKEN_ERROR)
{
if (!parser_global_statement(parser)) {
if (parser->tok == TOKEN_EOF)
parseerror(parser, "unexpected eof");
else if (!parser->errors)
parseerror(parser, "there have been errors, bailing out");
lex_close(parser->lex);
parser->lex = NULL;
return false;
}
}
} else {
parseerror(parser, "parse error");
lex_close(parser->lex);
parser->lex = NULL;
return false;
}
lex_close(parser->lex);
parser->lex = NULL;
return !parser->errors;
}
void parser_cleanup()
{
size_t i;
for (i = 0; i < parser->functions_count; ++i) {
ast_delete(parser->functions[i]);
}
for (i = 0; i < parser->imm_vector_count; ++i) {
ast_delete(parser->imm_vector[i]);
}
for (i = 0; i < parser->imm_string_count; ++i) {
ast_delete(parser->imm_string[i]);
}
for (i = 0; i < parser->imm_float_count; ++i) {
ast_delete(parser->imm_float[i]);
}
for (i = 0; i < parser->fields_count; ++i) {
ast_delete(parser->fields[i].var);
mem_d(parser->fields[i].name);
}
for (i = 0; i < parser->globals_count; ++i) {
ast_delete(parser->globals[i].var);
mem_d(parser->globals[i].name);
}
MEM_VECTOR_CLEAR(parser, functions);
MEM_VECTOR_CLEAR(parser, imm_vector);
MEM_VECTOR_CLEAR(parser, imm_string);
MEM_VECTOR_CLEAR(parser, imm_float);
MEM_VECTOR_CLEAR(parser, globals);
MEM_VECTOR_CLEAR(parser, fields);
MEM_VECTOR_CLEAR(parser, locals);
mem_d(parser);
}
static uint16_t progdefs_crc_sum(uint16_t old, const char *str)
{
return util_crc16(old, str, strlen(str));
}
static void progdefs_crc_file(const char *str)
{
/* write to progdefs.h here */
}
static uint16_t progdefs_crc_both(uint16_t old, const char *str)
{
old = progdefs_crc_sum(old, str);
progdefs_crc_file(str);
return old;
}
static void generate_checksum(parser_t *parser)
{
uint16_t crc = 0xFFFF;
size_t i;
crc = progdefs_crc_both(crc, "\n/* file generated by qcc, do not modify */\n\ntypedef struct\n{");
crc = progdefs_crc_sum(crc, "\tint\tpad[28];\n");
/*
progdefs_crc_file("\tint\tpad;\n");
progdefs_crc_file("\tint\tofs_return[3];\n");
progdefs_crc_file("\tint\tofs_parm0[3];\n");
progdefs_crc_file("\tint\tofs_parm1[3];\n");
progdefs_crc_file("\tint\tofs_parm2[3];\n");
progdefs_crc_file("\tint\tofs_parm3[3];\n");
progdefs_crc_file("\tint\tofs_parm4[3];\n");
progdefs_crc_file("\tint\tofs_parm5[3];\n");
progdefs_crc_file("\tint\tofs_parm6[3];\n");
progdefs_crc_file("\tint\tofs_parm7[3];\n");
*/
for (i = 0; i < parser->crc_globals; ++i) {
if (!ast_istype(parser->globals[i].var, ast_value))
continue;
switch (parser->globals[i].var->expression.vtype) {
case TYPE_FLOAT: crc = progdefs_crc_both(crc, "\tfloat\t"); break;
case TYPE_VECTOR: crc = progdefs_crc_both(crc, "\tvec3_t\t"); break;
case TYPE_STRING: crc = progdefs_crc_both(crc, "\tstring_t\t"); break;
case TYPE_FUNCTION: crc = progdefs_crc_both(crc, "\tfunc_t\t"); break;
default:
crc = progdefs_crc_both(crc, "\tint\t");
break;
}
crc = progdefs_crc_both(crc, parser->globals[i].name);
crc = progdefs_crc_both(crc, ";\n");
}
crc = progdefs_crc_both(crc, "} globalvars_t;\n\ntypedef struct\n{\n");
for (i = 0; i < parser->crc_fields; ++i) {
if (!ast_istype(parser->fields[i].var, ast_value))
continue;
switch (parser->fields[i].var->expression.next->expression.vtype) {
case TYPE_FLOAT: crc = progdefs_crc_both(crc, "\tfloat\t"); break;
case TYPE_VECTOR: crc = progdefs_crc_both(crc, "\tvec3_t\t"); break;
case TYPE_STRING: crc = progdefs_crc_both(crc, "\tstring_t\t"); break;
case TYPE_FUNCTION: crc = progdefs_crc_both(crc, "\tfunc_t\t"); break;
default:
crc = progdefs_crc_both(crc, "\tint\t");
break;
}
crc = progdefs_crc_both(crc, parser->fields[i].name);
crc = progdefs_crc_both(crc, ";\n");
}
crc = progdefs_crc_both(crc, "} entvars_t;\n\n");
code_crc = crc;
}
bool parser_finish(const char *output)
{
size_t i;
ir_builder *ir;
bool retval = true;
if (!parser->errors)
{
ir = ir_builder_new("gmqcc_out");
if (!ir) {
printf("failed to allocate builder\n");
return false;
}
for (i = 0; i < parser->fields_count; ++i) {
ast_value *field;
bool isconst;
if (!ast_istype(parser->fields[i].var, ast_value))
continue;
field = (ast_value*)parser->fields[i].var;
isconst = field->isconst;
field->isconst = false;
if (!ast_global_codegen((ast_value*)field, ir)) {
printf("failed to generate field %s\n", field->name);
ir_builder_delete(ir);
return false;
}
if (isconst) {
ir_value *ifld;
ast_expression *subtype;
field->isconst = true;
subtype = field->expression.next;
ifld = ir_builder_create_field(ir, field->name, subtype->expression.vtype);
if (subtype->expression.vtype == TYPE_FIELD)
ifld->fieldtype = subtype->expression.next->expression.vtype;
else if (subtype->expression.vtype == TYPE_FUNCTION)
ifld->outtype = subtype->expression.next->expression.vtype;
(void)!ir_value_set_field(field->ir_v, ifld);
}
}
for (i = 0; i < parser->globals_count; ++i) {
ast_value *asvalue;
if (!ast_istype(parser->globals[i].var, ast_value))
continue;
asvalue = (ast_value*)(parser->globals[i].var);
if (!asvalue->uses && !asvalue->isconst && asvalue->expression.vtype != TYPE_FUNCTION) {
if (strcmp(asvalue->name, "end_sys_globals") &&
strcmp(asvalue->name, "end_sys_fields"))
{
retval = retval && !genwarning(ast_ctx(asvalue), WARN_UNUSED_VARIABLE,
"unused global: `%s`", asvalue->name);
}
}
if (!ast_global_codegen(asvalue, ir)) {
printf("failed to generate global %s\n", parser->globals[i].name);
ir_builder_delete(ir);
return false;
}
}
for (i = 0; i < parser->imm_float_count; ++i) {
if (!ast_global_codegen(parser->imm_float[i], ir)) {
printf("failed to generate global %s\n", parser->imm_float[i]->name);
ir_builder_delete(ir);
return false;
}
}
for (i = 0; i < parser->imm_string_count; ++i) {
if (!ast_global_codegen(parser->imm_string[i], ir)) {
printf("failed to generate global %s\n", parser->imm_string[i]->name);
ir_builder_delete(ir);
return false;
}
}
for (i = 0; i < parser->imm_vector_count; ++i) {
if (!ast_global_codegen(parser->imm_vector[i], ir)) {
printf("failed to generate global %s\n", parser->imm_vector[i]->name);
ir_builder_delete(ir);
return false;
}
}
for (i = 0; i < parser->functions_count; ++i) {
if (!ast_function_codegen(parser->functions[i], ir)) {
printf("failed to generate function %s\n", parser->functions[i]->name);
ir_builder_delete(ir);
return false;
}
if (!ir_function_finalize(parser->functions[i]->ir_func)) {
printf("failed to finalize function %s\n", parser->functions[i]->name);
ir_builder_delete(ir);
return false;
}
}
if (retval) {
if (opts_dump)
ir_builder_dump(ir, printf);
generate_checksum(parser);
if (!ir_builder_generate(ir, output)) {
printf("*** failed to generate output file\n");
ir_builder_delete(ir);
return false;
}
}
ir_builder_delete(ir);
return retval;
}
printf("*** there were compile errors\n");
return false;
}
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