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rewrite expression parser with parentheses

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This commit is contained in:
r4
2021-12-23 15:56:12 +01:00
parent 052e78bf2e
commit 298883939b
5 changed files with 266 additions and 183 deletions
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5
calculate_pi.script
View File

@@ -4,9 +4,8 @@ k := 0
iterations := 100
while k - iterations {
// This is only so messy because I haven't implemented parentheses yet so I
// have to wrap everything into functions instead.
sum = sum + 1.0 / pow(16.0, float(k)) * float(4.0 / float(8.0 * float(k) + 1.0) - 2.0 / float(8.0 * float(k) + 4.0) - 1.0 / float(8.0 * float(k) + 5.0) - 1.0 / float(8.0 * float(k) + 6.0))
k_f := float(k)
sum = sum + 1.0 / pow(16.0, k_f) * (4.0 / (8.0 * k_f + 1.0) - 2.0 / (8.0 * k_f + 4.0) - 1.0 / (8.0 * k_f + 5.0) - 1.0 / (8.0 * k_f + 6.0))
k = k + 1
}

1
example.script
View File

@@ -2,6 +2,7 @@ x := 1
y := 1
i := 60
while i {
z := x + y
y = x

5
ir.h
View File

@@ -61,11 +61,6 @@ typedef struct IRTok {
IRParam lhs, rhs;
} Arith;
struct {
IRArgs *args;
size_t args_size;
} Print;
struct {
size_t iaddr;
} Jmp;

426
parse.c
View File

@@ -12,25 +12,27 @@ typedef struct Scope {
Map ident_addrs;
} Scope;
typedef struct ExprMode {
bool ignore_newln;
typedef struct ExprRet {
enum {
ExprModeJustCollapse, /* should leave either a literal or an own address as result */
ExprModeStorageAddr, /* should use the supplied storage address in any case; should leave no token behind */
ExprRetVal,
ExprRetIdent,
ExprRetLastInstr,
} kind;
union {
size_t StorageAddr;
IRTok LastInstr;
};
} ExprMode;
} ExprRet;
static void mark_err(const Tok *t);
static void set_irtok_dest_addr(IRTok *t, size_t addr);
static size_t get_ident_addr(const Scope *sc, const char *name, const Tok *errpos);
static IRParam tok_to_irparam(Scope *sc, Tok *t);
static Scope make_scope(Scope *parent, bool with_idents);
static void term_scope(Scope *sc);
static void expr(IRToks *out_ir, TokList *toks, Map *funcs, Scope *parent_sc, TokListItem *t, ExprMode mode);
static ExprRet expr(IRToks *out_ir, TokList *toks, Map *funcs, Scope *parent_sc, TokListItem *t);
static void expr_into_addr(IRToks *out_ir, TokList *toks, Map *funcs, Scope *parent_sc, TokListItem *t, size_t addr);
static IRParam expr_into_irparam(IRToks *out_ir, TokList *toks, Map *funcs, Scope *parent_sc, TokListItem *t);
static void stmt(IRToks *out_ir, TokList *toks, Map *funcs, Scope *sc, TokListItem *t);
static void mark_err(const Tok *t) {
@@ -38,6 +40,26 @@ static void mark_err(const Tok *t) {
err_col = t->col;
}
static void set_irtok_dest_addr(IRTok *t, size_t addr) {
switch (t->instr) {
case IRSet:
case IRNeg:
t->Unary.addr = addr;
break;
case IRAdd:
case IRSub:
case IRMul:
case IRDiv:
t->Arith.addr = addr;
break;
case IRCallInternal:
t->CallI.ret_addr = addr;
break;
default:
ASSERT_UNREACHED();
}
}
static size_t get_ident_addr(const Scope *sc, const char *name, const Tok *errpos) {
size_t addr;
bool exists = false;
@@ -91,46 +113,60 @@ static void term_scope(Scope *sc) {
map_term(&sc->ident_addrs);
}
static void expr(IRToks *out_ir, TokList *toks, Map *funcs, Scope *parent_sc, TokListItem *t, ExprMode mode) {
/* A simplified example of how the operator precedence parsing works:
* ________________________________
* Where t points to (between l_op and r_op in each step)
* |
* v
* 5 + 2 * 2 \n
* ^ ^
* | |
* l_op r_op
* precedence of '+' is higher than that of the front delimiter => move forward
* ________________________________
* 5 + 2 * 2 \n
* ^ ^
* | |
* l_op r_op
* precedence of '*' is higher than that of '+' => move forward
* ________________________________
* 5 + 2 * 2 \n
* ^ ^
* | |
* l_op r_op
* precedence of '\n' (a delimiter) is lower than that of '*' => evaluate and move l_op 2 back
* ________________________________
* 5 + 4 \n
* ^ ^
* | |
* l_op r_op
* precedence of '\n' (a delimiter) is lower than that of '+' => evaluate and move l_op 2 back
* ________________________________
* 9 \n
* ^ ^
* | |
* l_op r_op
* both l_op and r_op are delimiters (their precedence is PREC_DELIM) => done
*/
/* The job of this function is to reduce the expression to the most simple form
* writing the least IR instructions possible (without overanalyzing).
* This means that the only IR instructions it will be writing are those for
* calculating intermediate values.
* In the case of ExprRetVal and ExprRetIdent, the value isn't 'returned' in
* the traditional sense, but rather the result is left in the token stream.
* The 'return' value can be of 3 different types:
* - ExprRetVal: The expression yields a constant value as a result.
* Examples: '5', '5 + 2 * 3' or '5 + (2 + 1) * 3'
* - ExprRetIdent: The expression yields an identifier as a result.
* Examples: 'a' or '(((a)))'
* - ExprRetLastInstr: The expression is a more complex sequence of
* instructions. Here the last instruction is returned so the caller can
* manually set the destination address.
* Examples: 'a + 1', '2 + a * b' or '2 + 4 * (b * b) / 5'
*
* Here is also a simplified example of how the operator precedence parsing works:
* ________________________________
* Where t points to (between l_op and r_op in each step)
* |
* v
* 5 + 2 * 2 \n
* ^ ^
* | |
* l_op r_op
* precedence of '+' is higher than that of the front delimiter => move forward
* ________________________________
* 5 + 2 * 2 \n
* ^ ^
* | |
* l_op r_op
* precedence of '*' is higher than that of '+' => move forward
* ________________________________
* 5 + 2 * 2 \n
* ^ ^
* | |
* l_op r_op
* precedence of '\n' (a delimiter) is lower than that of '*' => evaluate and move l_op 2 back
* ________________________________
* 5 + 4 \n
* ^ ^
* | |
* l_op r_op
* precedence of '\n' (a delimiter) is lower than that of '+' => evaluate and move l_op 2 back
* ________________________________
* 9 \n
* ^ ^
* | |
* l_op r_op
* both l_op and r_op are delimiters (their precedence is PREC_DELIM) => done
*/
static ExprRet expr(IRToks *out_ir, TokList *toks, Map *funcs, Scope *parent_sc, TokListItem *t) {
TokListItem *start = t;
/* Each expression and subexpression has its own scope. */
Scope sc = make_scope(parent_sc, false);
for (;;) {
@@ -141,88 +177,101 @@ static void expr(IRToks *out_ir, TokList *toks, Map *funcs, Scope *parent_sc, To
negate = true;
}
/* Ignore newlines if told to do so. */
if (mode.ignore_newln && t->next->tok.kind == TokOp && t->next->tok.Op == OpNewLn)
/* Collapse parentheses. */
if (t->tok.kind == TokOp && t->tok.Op == OpLParen) {
ExprRet r;
TRY_RET(r = expr(out_ir, toks, funcs, &sc, t->next), (ExprRet){0});
if (r.kind == ExprRetLastInstr) {
size_t res_addr = sc.mem_addr++;
set_irtok_dest_addr(&r.LastInstr, res_addr);
irtoks_app(out_ir, r.LastInstr);
t->tok = (Tok){
.ln = t->tok.ln,
.col = t->tok.col,
.kind = TokIdent,
.Ident = {
.kind = IdentAddr,
.Addr = res_addr,
},
};
} else if (r.kind == ExprRetVal || r.kind == ExprRetIdent) {
t->tok = t->next->tok;
toklist_del(toks, t->next, t->next);
} else
ASSERT_UNREACHED();
toklist_del(toks, t->next, t->next);
}
/* Collapse function call. */
if (t->tok.kind == TokIdent && t->tok.Ident.kind == IdentName && t->next->tok.kind == TokOp && t->next->tok.Op == OpLParen) {
else if (t->tok.kind == TokIdent && t->tok.Ident.kind == IdentName && t->next->tok.kind == TokOp && t->next->tok.Op == OpLParen) {
/* get function */
BuiltinFunc func;
bool exists = map_get(funcs, t->tok.Ident.Name, &func);
if (!exists) {
mark_err(&t->tok);
set_err("Unrecognized function: %s()", t->tok.Ident.Name);
return;
return (ExprRet){0};
}
TokListItem *func_ident = t;
t = t->next->next;
toklist_del(toks, t->prev, t->prev);
size_t n_args = 0;
TokListItem *first_arg = t;
TokListItem *last_arg = NULL;
t = func_ident->next;
/* we want to try to eliminate function calls at runtime if possible */
bool eval_func_in_place = !func.side_effects;
size_t args_len = 0;
size_t args_cap = 16;
IRParam *args = xmalloc(sizeof(IRParam) * args_cap);
for (;;) {
n_args++;
TRY(expr(out_ir, toks, funcs, &sc, t, (ExprMode){ .kind = ExprModeJustCollapse, .ignore_newln = true }));
if (t->tok.kind == TokIdent)
if (args_len+1 > args_cap)
args = xrealloc(args, (args_cap *= 2));
IRParam a;
TRY_RET_ELSE(a = expr_into_irparam(out_ir, toks, funcs, &sc, t->next), (ExprRet){0}, free(args));
args[args_len++] = a;
if (a.kind != IRParamLiteral)
eval_func_in_place = false;
if (t->next->tok.kind == TokOp) {
if (t->next->tok.Op == OpComma) {
toklist_del(toks, t->next, t->next);
t = t->next;
continue;
} else if (t->next->tok.Op == OpRParen) {
toklist_del(toks, t->next, t->next);
last_arg = t;
break;
}
}
mark_err(&t->next->tok);
set_err("Expected ',' or ')' after function argument");
return;
free(args);
return (ExprRet){0};
}
if (func.n_args != n_args) {
t = func_ident;
toklist_del(toks, t->next, t->next); /* delete left parenthesis */
if (func.n_args != args_len) {
mark_err(&func_ident->tok);
const char *plural = func.n_args == 1 ? "" : "s";
set_err("Function %s() takes %zu argument%s but got %zu", func.name, func.n_args, plural, n_args);
return;
set_err("Function %s() takes %zu argument%s but got %zu", func.name, func.n_args, plural, args_len);
free(args);
return (ExprRet){0};
}
if (eval_func_in_place) {
Value *args = xmalloc(sizeof(Value) * n_args);
TokListItem *itm = first_arg;
for (size_t i = 0;; i++) {
args[i] = itm->tok.Val;
if (itm == last_arg)
break;
itm = itm->next;
}
/* evaluate the function in place */
Value *arg_vals = xmalloc(sizeof(Value) * args_len);
for (size_t i = 0; i < args_len; i++)
arg_vals[i] = args[i].Literal;
func_ident->tok = (Tok) {
.kind = TokVal,
.Val = func.func(args),
.Val = func.func(arg_vals),
};
free(arg_vals);
free(args);
} else {
bool is_last_operation = func_ident == start && last_arg->next->tok.kind == TokOp && op_prec[last_arg->next->tok.Op] == PREC_DELIM;
bool is_last_operation = t == start && t->next->tok.kind == TokOp && op_prec[t->next->tok.Op] == PREC_DELIM;
IRParam *args = xmalloc(sizeof(IRParam) * n_args);
TokListItem *itm = first_arg;
for (size_t i = 0;; i++) {
TRY_ELSE(args[i] = tok_to_irparam(&sc, &itm->tok), free(args));
if (itm == last_arg)
break;
itm = itm->next;
}
size_t res_addr = is_last_operation ? 0 : sc.mem_addr++;
size_t res_addr;
if (mode.kind == ExprModeStorageAddr && is_last_operation)
res_addr = mode.StorageAddr;
else
res_addr = sc.mem_addr++;
irtoks_app(out_ir, (IRTok){
/* function call instruction */
IRTok ir = {
.ln = func_ident->tok.ln,
.col = func_ident->tok.col,
.instr = IRCallInternal,
@@ -231,12 +280,18 @@ static void expr(IRToks *out_ir, TokList *toks, Map *funcs, Scope *parent_sc, To
.fid = func.fid,
.args = args,
},
});
if (mode.kind == ExprModeStorageAddr && is_last_operation) {
toklist_del(toks, func_ident, func_ident);
break;
};
if (is_last_operation) {
/* done */
toklist_del(toks, t, t);
return (ExprRet){ .kind = ExprRetLastInstr, .LastInstr = ir };
} else {
func_ident->tok = (Tok) {
/* write IR instruction */
irtoks_app(out_ir, ir);
/* leave new memory address as result */
t->tok = (Tok){
.kind = TokIdent,
.Ident = {
.kind = IdentAddr,
@@ -245,34 +300,27 @@ static void expr(IRToks *out_ir, TokList *toks, Map *funcs, Scope *parent_sc, To
};
}
}
t = func_ident;
toklist_del(toks, first_arg, last_arg);
}
/* Collapse negative factor. */
if (negate) {
bool is_last_operation = t->prev == start && t->next->tok.kind == TokOp && op_prec[t->next->tok.Op] == PREC_DELIM;
Tok *v = &t->tok;
t = t->prev;
toklist_del(toks, t->next, t->next);
Tok *v = &t->tok; /* what we want to negate */
t = t->prev; /* go back to the '-' sign */
toklist_del(toks, t->next, t->next); /* again, just removing the reference */
bool is_last_operation = t == start && t->next->tok.kind == TokOp && op_prec[t->next->tok.Op] == PREC_DELIM;
if (v->kind == TokVal) {
/* immediately negate value */
t->tok.kind = TokVal;
t->tok.Val = eval_unary(IRNeg, &v->Val);
} else {
/* use the predefined storage address if it was requested and we're on the last operation */
size_t res_addr;
if (mode.kind == ExprModeStorageAddr && is_last_operation)
res_addr = mode.StorageAddr;
else
res_addr = sc.mem_addr++;
size_t res_addr = is_last_operation ? 0 : sc.mem_addr++;
/* add IR instruction to negate the value */
/* Instruction to negate. */
IRParam v_irparam;
TRY(v_irparam = tok_to_irparam(&sc, v));
irtoks_app(out_ir, (IRTok){
TRY_RET(v_irparam = tok_to_irparam(&sc, v), (ExprRet){0});
IRTok ir = {
.ln = t->tok.ln,
.col = t->tok.col,
.instr = IRNeg,
@@ -280,13 +328,16 @@ static void expr(IRToks *out_ir, TokList *toks, Map *funcs, Scope *parent_sc, To
.addr = res_addr,
.val = v_irparam,
},
});
};
if (mode.kind == ExprModeStorageAddr && is_last_operation) {
if (is_last_operation) {
/* done */
toklist_del(toks, t, t);
return;
return (ExprRet){ .kind = ExprRetLastInstr, .LastInstr = ir };
} else {
/* write IR instruction */
irtoks_app(out_ir, ir);
/* leave new memory address as result */
t->tok.kind = TokIdent;
t->tok.Ident = (Identifier){
@@ -308,7 +359,7 @@ static void expr(IRToks *out_ir, TokList *toks, Map *funcs, Scope *parent_sc, To
if (l_op->kind != TokOp) {
mark_err(l_op);
set_err("Expected operator");
return;
return (ExprRet){0};
}
l_op_prec = op_prec[l_op->Op];
}
@@ -317,55 +368,42 @@ static void expr(IRToks *out_ir, TokList *toks, Map *funcs, Scope *parent_sc, To
if (r_op->kind != TokOp) {
mark_err(r_op);
set_err("Expected operator");
return;
return (ExprRet){0};
}
r_op_prec = op_prec[r_op->Op];
/* If l_op and r_op are both delimiters, the expression is fully evaluated.
* NOTE: Sometimes, we don't reach this point because the function already
* exits directly after the last operation. */
/* If l_op and r_op are both delimiters, we don't have to evaluate
* anything. */
if (l_op_prec == PREC_DELIM && r_op_prec == PREC_DELIM) {
if (t->tok.kind != TokVal && t->tok.kind != TokIdent) {
if (t->tok.kind == TokIdent) {
return (ExprRet){ .kind = ExprRetIdent };
} else if (t->tok.kind == TokVal) {
return (ExprRet){ .kind = ExprRetVal };
} else {
mark_err(&t->tok);
set_err("Expected literal or identifier");
return;
return (ExprRet){0};
}
if (mode.kind == ExprModeStorageAddr) {
IRParam res;
TRY(res = tok_to_irparam(&sc, &t->tok));
irtoks_app(out_ir, (IRTok){
.ln = t->tok.ln,
.col = t->tok.col,
.instr = IRSet,
.Unary = {
.addr = mode.StorageAddr,
.val = res,
},
});
toklist_del(toks, t, t);
}
return;
}
bool is_last_operation = t->prev && t->prev->prev == start && r_op_prec == PREC_DELIM;
/* This is the actual operator precedence parser as described above. */
/* This is the operator precedence parser described above. */
if (r_op_prec > l_op_prec)
t = t->next->next;
else {
/* some basic checks */
Tok *rhs = &t->tok;
if (rhs->kind != TokVal && rhs->kind != TokIdent) {
mark_err(rhs);
set_err("Expected literal or identifier");
return;
return (ExprRet){0};
}
t = t->prev->prev;
Tok *lhs = &t->tok;
if (lhs->kind != TokVal && lhs->kind != TokIdent) {
mark_err(lhs);
set_err("Expected literal or identifier");
return;
return (ExprRet){0};
}
/* delete the tokens that fall away from collapsing the expression
@@ -382,26 +420,23 @@ static void expr(IRToks *out_ir, TokList *toks, Map *funcs, Scope *parent_sc, To
default:
mark_err(l_op);
set_err("Unknown operation: '%s'", op_str[l_op->Op]);
return;
return (ExprRet){0};
}
if (lhs->kind == TokVal && rhs->kind == TokVal) {
/* evaluate the constant expression immediately */
lhs->kind = TokVal;
TRY(lhs->Val = eval_arith(instr, &lhs->Val, &rhs->Val));
TRY_RET(lhs->Val = eval_arith(instr, &lhs->Val, &rhs->Val), (ExprRet){0});
} else {
bool is_last_operation = t == start && r_op_prec == PREC_DELIM;
IRParam lhs_irparam, rhs_irparam;
TRY(lhs_irparam = tok_to_irparam(&sc, lhs));
TRY(rhs_irparam = tok_to_irparam(&sc, rhs));
TRY_RET(lhs_irparam = tok_to_irparam(&sc, lhs), (ExprRet){0});
TRY_RET(rhs_irparam = tok_to_irparam(&sc, rhs), (ExprRet){0});
/* use the predefined storage address if it was requested and we're on the last operation */
size_t res_addr;
if (mode.kind == ExprModeStorageAddr && is_last_operation)
res_addr = mode.StorageAddr;
else
res_addr = sc.mem_addr++;
size_t res_addr = is_last_operation ? 0 : sc.mem_addr++;
/* emit IR code to evaluate the non-constant expression */
irtoks_app(out_ir, (IRTok){
IRTok ir = {
.ln = l_op->ln,
.col = l_op->col,
.instr = instr,
@@ -410,13 +445,16 @@ static void expr(IRToks *out_ir, TokList *toks, Map *funcs, Scope *parent_sc, To
.lhs = lhs_irparam,
.rhs = rhs_irparam,
},
});
};
if (mode.kind == ExprModeStorageAddr && is_last_operation) {
if (is_last_operation) {
/* done */
toklist_del(toks, t, t);
break;
return (ExprRet){ .kind = ExprRetLastInstr, .LastInstr = ir };
} else {
/* write IR instruction */
irtoks_app(out_ir, ir);
/* leave new memory address as result */
lhs->kind = TokIdent;
lhs->Ident = (Identifier){
@@ -429,13 +467,63 @@ static void expr(IRToks *out_ir, TokList *toks, Map *funcs, Scope *parent_sc, To
}
}
static void expr_into_addr(IRToks *out_ir, TokList *toks, Map *funcs, Scope *parent_sc, TokListItem *t, size_t addr) {
ExprRet r;
TRY(r = expr(out_ir, toks, funcs, parent_sc, t));
if (r.kind == ExprRetLastInstr) {
set_irtok_dest_addr(&r.LastInstr, addr);
irtoks_app(out_ir, r.LastInstr);
t->tok = (Tok){
.ln = t->tok.ln,
.col = t->tok.col,
.kind = TokIdent,
.Ident = {
.kind = IdentAddr,
.Addr = addr,
},
};
} else if (r.kind == ExprRetVal || r.kind == ExprRetIdent) {
IRParam res;
TRY(res = tok_to_irparam(parent_sc, &t->tok));
irtoks_app(out_ir, (IRTok){
.instr = IRSet,
.Unary = {
.addr = addr,
.val = res,
},
});
toklist_del(toks, t, t);
} else
ASSERT_UNREACHED();
}
static IRParam expr_into_irparam(IRToks *out_ir, TokList *toks, Map *funcs, Scope *parent_sc, TokListItem *t) {
ExprRet r;
TRY_RET(r = expr(out_ir, toks, funcs, parent_sc, t), (IRParam){0});
if (r.kind == ExprRetLastInstr) {
Scope sc = make_scope(parent_sc, false);
size_t addr = sc.mem_addr++;
set_irtok_dest_addr(&r.LastInstr, addr);
irtoks_app(out_ir, r.LastInstr);
return (IRParam){
.kind = IRParamAddr,
.Addr = addr,
};
} else if (r.kind == ExprRetVal || r.kind == ExprRetIdent) {
IRParam ret;
TRY_RET(ret = tok_to_irparam(parent_sc, &t->tok), (IRParam){0});
toklist_del(toks, t, t);
return ret;
} else
ASSERT_UNREACHED();
}
static void stmt(IRToks *out_ir, TokList *toks, Map *funcs, Scope *sc, TokListItem *t) {
TokListItem *start = t;
if (t->tok.kind == TokIdent && t->tok.Ident.kind == IdentName && (t->next->tok.kind == TokDeclare || t->next->tok.kind == TokAssign)) {
char *name = t->tok.Ident.Name;
t = t->next;
if (t->tok.kind == TokDeclare) {
t = t->next;
size_t addr = sc->mem_addr++;
bool replaced = map_insert(&sc->ident_addrs, name, &addr);
if (replaced) {
@@ -443,12 +531,11 @@ static void stmt(IRToks *out_ir, TokList *toks, Map *funcs, Scope *sc, TokListIt
set_err("'%s' already declared in this scope", name);
return;
}
TRY(expr(out_ir, toks, funcs, sc, t, (ExprMode){ .kind = ExprModeStorageAddr, .ignore_newln = false, .StorageAddr = addr }));
TRY(expr_into_addr(out_ir, toks, funcs, sc, t->next, addr));
} else if (t->tok.kind == TokAssign) {
t = t->next;
size_t addr;
TRY(addr = get_ident_addr(sc, name, &start->tok));
TRY(expr(out_ir, toks, funcs, sc, t, (ExprMode){ .kind = ExprModeStorageAddr, .ignore_newln = false, .StorageAddr = addr }));
TRY(expr_into_addr(out_ir, toks, funcs, sc, t->next, addr));
} else
ASSERT_UNREACHED();
} else if (t->tok.kind == TokOp && t->tok.Op == OpLCurl) {
@@ -488,22 +575,20 @@ static void stmt(IRToks *out_ir, TokList *toks, Map *funcs, Scope *sc, TokListIt
},
});
t = t->next;
/* parse condition */
IRToks cond_ir;
irtoks_init_short(&cond_ir);
TRY_ELSE(expr(&cond_ir, toks, funcs, sc, t, (ExprMode){ .kind = ExprModeJustCollapse, .ignore_newln = true }), irtoks_term(&cond_ir));
IRParam cond_irparam;
TRY_ELSE(cond_irparam = tok_to_irparam(sc, &t->tok), irtoks_term(&cond_ir));
IRParam cond;
TRY_ELSE(cond = expr_into_irparam(&cond_ir, toks, funcs, sc, t->next), irtoks_term(&cond_ir));
/* add conditional jump */
irtoks_app(&cond_ir, (IRTok){
.ln = t->tok.ln,
.col = t->tok.col,
.ln = t->next->tok.ln,
.col = t->next->tok.col,
.instr = IRJnz,
.CJmp = {
.iaddr = jmp_instr_iaddr + 1,
.condition = cond_irparam,
.condition = cond,
},
});
@@ -521,7 +606,8 @@ static void stmt(IRToks *out_ir, TokList *toks, Map *funcs, Scope *sc, TokListIt
} else if (t->tok.kind == TokOp && t->tok.Op == OpNewLn) {
} else {
/* assume expression */
TRY(expr(out_ir, toks, funcs, sc, t, (ExprMode){ .kind = ExprModeJustCollapse, .ignore_newln = false }));
TRY(expr_into_irparam(out_ir, toks, funcs, sc, t));
return;
}
toklist_del(toks, start, t);
}

10
vm.c
View File

@@ -46,21 +46,23 @@ void run(const IRToks *ir, const BuiltinFunc *builtin_funcs) {
Stack s = stack_make();
for (size_t i = 0; i < ir->len;) {
IRTok *instr = &ir->toks[i];
err_ln = instr->ln;
err_col = instr->col;
switch (instr->instr) {
case IRSet:
case IRNeg:
stack_fit(&s, instr->Unary.addr);
s.mem[instr->Unary.addr] = eval_unary(instr->instr, irparam_to_val(&s, &instr->Unary.val));
TRY(s.mem[instr->Unary.addr] = eval_unary(instr->instr, irparam_to_val(&s, &instr->Unary.val)));
break;
case IRAdd:
case IRSub:
case IRDiv:
case IRMul:
stack_fit(&s, instr->Arith.addr);
s.mem[instr->Arith.addr] = eval_arith(instr->instr,
TRY(s.mem[instr->Arith.addr] = eval_arith(instr->instr,
irparam_to_val(&s, &instr->Arith.lhs),
irparam_to_val(&s, &instr->Arith.rhs)
);
));
break;
case IRJmp:
i = instr->Jmp.iaddr;
@@ -78,7 +80,7 @@ void run(const IRToks *ir, const BuiltinFunc *builtin_funcs) {
args[i] = *irparam_to_val(&s, &instr->CallI.args[i]);
stack_fit(&s, instr->CallI.ret_addr);
s.mem[instr->CallI.ret_addr] = f->func(args);
TRY_ELSE(s.mem[instr->CallI.ret_addr] = f->func(args), free(args));
free(args);
break;