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[gamecode] Add instructions for stack adjust, nop, and ldconst

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ldconst isn't implemented yet but the plan is to load various constants
(eg, 0, 1, 2, pi, e, ...).

Stack adjust is useful for adding an offset to the stack pointer without
having to worry about finding it (and it checks for alignment).

nop is just that :)
This commit is contained in:
Bill Currie 2022-01-21 18:44:51 +09:00
parent 616a52efb5
commit 3df46d197f
2 changed files with 42 additions and 0 deletions
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30
libs/gamecode/opcodes.py
View file

@ -5,6 +5,9 @@ bitmap_txt = """
0 0011 mmss pop
0 1ccc ttss compare
0 0000 00nn
0 0000 0000 noop
0 0000 0001 adjstk
0 0000 0010 constant
0 1011 nnnn
0 1111 nnnn
@ -75,6 +78,14 @@ etype_tt = ["ev_int", "ev_float", "ev_long", "ev_double"]
unsigned_t = ["ev_uint", "ev_ulong"]
float_t = ["ev_float", "ev_double"]
adjstk_formats = {
"opcode": "OP_ADJSTK",
"mnemonic": "adjstk",
"opname": "adjstk",
"format": "%sa, %sb",
"widths": "0, 0, 0",
"types": "ev_short, ev_short, ev_invalid",
}
bitops_formats = {
"opcode": "OP_{op_bit[oo].upper()}_{bit_type[t]}_{ss+1}",
"mnemonic": "{op_bit[oo]}",
@ -157,6 +168,14 @@ compare2_formats = {
"cmp_types": unsigned_t,
},
}
constant_formats = {
"opcode": "OP_LDCONST",
"mnemonic": "ldconst",
"opname": "ldconst",
"format": "%sa, %sb, %gc",
"widths": "0, 0, -1",
"types": "ev_short, ev_short, ev_void",
}
convert_formats = {
"opcode": "OP_CONV",
"mnemonic": "conv",
@ -268,6 +287,14 @@ move_formats = {
],
},
}
noop_formats = {
"opcode": "OP_NOP",
"mnemonic": "nop",
"opname": "nop",
"format": "there were plums...",
"widths": "0, 0, 0",
"types": "ev_invalid, ev_invalid, ev_invalid",
}
push_formats = {
"opcode": "OP_PUSH_{op_mode[mm]}_{ss+1}",
"mnemonic": "push",
@ -473,11 +500,13 @@ with_formats = {
}
group_map = {
"adjstk": adjstk_formats,
"bitops": bitops_formats,
"branch": branch_formats,
"call": call_formats,
"compare": compare_formats,
"compare2": compare2_formats,
"constant": constant_formats,
"convert": convert_formats,
"hops": hops_formats,
"jump": jump_formats,
@ -486,6 +515,7 @@ group_map = {
"mathops": mathops_formats,
"memset": memset_formats,
"move": move_formats,
"noop": noop_formats,
"push": push_formats,
"pushregs": pushregs_formats,
"pop": pop_formats,

12
libs/gamecode/pr_exec.c
View file

@ -2766,6 +2766,18 @@ pr_exec_ruamoko (progs_t *pr, int exitdepth)
pr_opcode_e st_op = st->op & OP_MASK;
switch (st_op) {
// 0 0000
case OP_NOP:
break;
case OP_ADJSTK:
if (st->a || (st->b & 3)) {
PR_RunError (pr, "invalid stack adjustment: %d, %d",
st->a, (short) st->b);
}
*pr->globals.stack += (short) st->b;
break;
case OP_LDCONST:
PR_RunError (pr, "OP_LDCONST not implemented");
break;
case OP_LOAD_B_1:
case OP_LOAD_C_1:
case OP_LOAD_D_1: