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spingle/source/pr_exec.c

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/*
Copyright (C) 1996-2001 Id Software, Inc.
Copyright (C) 2010-2014 QuakeSpasm developers
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "q_defs.h"
typedef struct
{
int32_t s;
dfunction_t *f;
} prstack_t;
#define MAX_STACK_DEPTH 64 /* was 32 */
static prstack_t pr_stack[MAX_STACK_DEPTH];
static int32_t pr_depth;
#define LOCALSTACK_SIZE 2048
static int32_t localstack[LOCALSTACK_SIZE];
static int32_t localstack_used;
bool pr_trace;
dfunction_t *pr_xfunction;
int32_t pr_xstatement;
int32_t pr_argc;
static const char *pr_opnames[] =
{
#define pr_ops__xmac(x) #x,
#include "pr_ops.h"
};
const char *PR_GlobalString(int32_t ofs);
const char *PR_GlobalStringNoContents(int32_t ofs);
//=============================================================================
/*
=================
PR_PrintStatement
=================
*/
static void PR_PrintStatement(dstatement_t *s)
{
size_t i;
if((uint32_t)s->op < arraysizeof(pr_opnames))
{
Con_Printf("%s ", pr_opnames[s->op]);
i = strlen(pr_opnames[s->op]);
for(; i < 10; i++)
Con_Printf(" ");
}
if(s->op == OP_IF || s->op == OP_IFNOT)
Con_Printf("%sbranch %" PRIi32, PR_GlobalString(s->a), s->b);
else if(s->op == OP_GOTO)
{
Con_Printf("branch %" PRIi32, s->a);
}
else if((uint32_t)(s->op - OP_STORE_F) < 6)
{
Con_Printf("%s", PR_GlobalString(s->a));
Con_Printf("%s", PR_GlobalStringNoContents(s->b));
}
else
{
if(s->a)
Con_Printf("%s", PR_GlobalString(s->a));
if(s->b)
Con_Printf("%s", PR_GlobalString(s->b));
if(s->c)
Con_Printf("%s", PR_GlobalStringNoContents(s->c));
}
Con_Printf("\n");
}
/*
============
PR_StackTrace
============
*/
static void PR_StackTrace(void)
{
int32_t i;
dfunction_t *f;
if(pr_depth == 0)
{
Con_Printf("<NO STACK>\n");
return;
}
pr_stack[pr_depth].f = pr_xfunction;
for(i = pr_depth; i >= 0; i--)
{
f = pr_stack[i].f;
if(!f)
{
Con_Printf("<NO FUNCTION>\n");
}
else
{
Con_Printf("%12s : %s\n", PR_GetString(f->s_file), PR_GetString(f->s_name));
}
}
}
/*
============
PR_Profile_f
============
*/
void PR_Profile_f(void)
{
int32_t i, num;
int32_t pmax;
dfunction_t *f, *best;
if(!sv.active)
return;
num = 0;
do
{
pmax = 0;
best = NULL;
for(i = 0; i < progs.numfunctions; i++)
{
f = &pr_functions[i];
if(f->profile > pmax)
{
pmax = f->profile;
best = f;
}
}
if(best)
{
if(num < 10)
Con_Printf("%7" PRIi32 " %s\n", best->profile, PR_GetString(best->s_name));
num++;
best->profile = 0;
}
}
while(best);
}
/*
============
PR_RunError
Aborts the currently executing function
============
*/
void PR_RunError(const char *error, ...)
{
va_list argptr;
char string[1024];
va_start(argptr, error);
q_vsnprintf(string, sizeof(string), error, argptr);
va_end(argptr);
PR_PrintStatement(pr_statements + pr_xstatement);
PR_StackTrace();
Con_Printf("%s\n", string);
pr_depth = 0; // dump the stack so host_error can shutdown functions
Host_Error("Program error");
}
/*
====================
PR_EnterFunction
Returns the new program statement counter
====================
*/
static int32_t PR_EnterFunction(dfunction_t *f)
{
int32_t i, j, c, o;
pr_stack[pr_depth].s = pr_xstatement;
pr_stack[pr_depth].f = pr_xfunction;
pr_depth++;
if(pr_depth >= MAX_STACK_DEPTH)
PR_RunError("stack overflow");
// save off any locals that the new function steps on
c = f->locals;
if(localstack_used + c > LOCALSTACK_SIZE)
PR_RunError("PR_ExecuteProgram: locals stack overflow\n");
for(i = 0; i < c ; i++)
localstack[localstack_used + i] = G_Int(f->parm_start + i);
localstack_used += c;
// copy parameters
o = f->parm_start;
for(i = 0; i < f->numparms; i++)
{
for(j = 0; j < f->parm_size[i]; j++)
{
G_Int(o) = G_Int(GBL_PARM0 + i * 3 + j);
o++;
}
}
pr_xfunction = f;
return f->first_statement - 1; // offset the s++
}
/*
====================
PR_LeaveFunction
====================
*/
static int32_t PR_LeaveFunction(void)
{
int32_t i, c;
if(pr_depth <= 0)
Host_Error("prog stack underflow");
// Restore locals from the stack
c = pr_xfunction->locals;
localstack_used -= c;
if(localstack_used < 0)
PR_RunError("PR_ExecuteProgram: locals stack underflow");
for(i = 0; i < c; i++)
G_Int(pr_xfunction->parm_start + i) = localstack[localstack_used + i];
// up stack
pr_depth--;
pr_xfunction = pr_stack[pr_depth].f;
return pr_stack[pr_depth].s;
}
/*
====================
PR_ExecuteProgram
The interpretation main loop
====================
*/
void PR_ExecuteProgram(func_t fnum)
{
#if HAVE_COMPUTED_GOTO
#define CASE(op) oper_##op:
#define BREAK goto oper_end;
#define GOTO_OP(op) goto *oper_list[op];
#define END_GOTO_OP oper_end:;
#else
#define CASE(op) case op:
#define BREAK break;
#define GOTO_OP(op) switch(op) {
#define END_GOTO_OP }
#endif
#define OPA G_Eval((uint16_t)st->a)
#define OPB G_Eval((uint16_t)st->b)
#define OPC G_Eval((uint16_t)st->c)
#define PTR ((eval_t *)ProgEdict(OPB->edict))
#define EDI ProgEdict(OPA->edict)
#define MakeOpArithF(op, exp) \
CASE(op) \
OPC->flt = OPA->flt exp OPB->flt; \
BREAK
#define MakeOpArithV(op, exp) \
CASE(op) \
OPC->vec[0] = OPA->vec[0] exp OPB->vec[0]; \
OPC->vec[1] = OPA->vec[1] exp OPB->vec[1]; \
OPC->vec[2] = OPA->vec[2] exp OPB->vec[2]; \
BREAK
#define MakeOpArithB(op, exp) \
CASE(op) \
OPC->flt = (int32_t)OPA->flt exp (int32_t)OPB->flt; \
BREAK
#if HAVE_COMPUTED_GOTO
static void const *const oper_list[] = {
#define pr_ops__xmac(x) &&oper_OP_##x,
#include "pr_ops.h"
};
#endif
dstatement_t *st;
dfunction_t *f, *newf;
int32_t profile, startprofile;
edict_t *ed;
int32_t exitdepth;
if(!fnum || fnum >= progs.numfunctions)
{
if(G_PEdict(GBL_self))
ED_Print(ProgEdict(G_PEdict(GBL_self)));
Host_Error("PR_ExecuteProgram: NULL function");
}
f = &pr_functions[fnum];
pr_trace = false;
// make a stack frame
exitdepth = pr_depth;
st = &pr_statements[PR_EnterFunction(f)];
startprofile = profile = 0;
for(;;)
{
/* next statement */
st++;
if(++profile > 100000)
{
pr_xstatement = st - pr_statements;
PR_RunError("runaway loop error");
}
if(pr_trace)
PR_PrintStatement(st);
GOTO_OP(st->op)
MakeOpArithF(OP_ADD_F, +)
MakeOpArithF(OP_SUB_F, -)
MakeOpArithF(OP_MUL_F, *)
MakeOpArithF(OP_DIV_F, /)
MakeOpArithV(OP_ADD_V, +)
MakeOpArithV(OP_SUB_V, -)
MakeOpArithB(OP_BITAND, &)
MakeOpArithB(OP_BITOR, |)
CASE(OP_MUL_V) OPC->flt = DotProduct(OPA->vec, OPB->vec); BREAK
CASE(OP_MUL_FV) VectorScale(OPB->vec, OPA->flt, OPC->vec); BREAK
CASE(OP_MUL_VF) VectorScale(OPA->vec, OPB->flt, OPC->vec); BREAK
MakeOpArithF(OP_GE, >=)
MakeOpArithF(OP_LE, <=)
MakeOpArithF(OP_GT, >)
MakeOpArithF(OP_LT, <)
MakeOpArithF(OP_AND, &&)
MakeOpArithF(OP_OR, ||)
MakeOpArithF(OP_EQ_F, ==)
MakeOpArithF(OP_NE_F, !=)
CASE(OP_NOT_F)
OPC->flt = !OPA->flt;
BREAK
CASE(OP_NOT_V)
OPC->flt = !OPA->vec[0] && !OPA->vec[1] && !OPA->vec[2];
BREAK
CASE(OP_NOT_S)
OPC->flt = !OPA->string || !*PR_GetString(OPA->string);
BREAK
CASE(OP_NOT_FNC)
OPC->flt = !OPA->func;
BREAK
CASE(OP_NOT_ENT)
OPC->flt = EDI == sv.edicts;
BREAK
CASE(OP_EQ_V)
OPC->flt = OPA->vec[0] == OPB->vec[0] &&
OPA->vec[1] == OPB->vec[1] &&
OPA->vec[2] == OPB->vec[2];
BREAK
CASE(OP_EQ_S)
OPC->flt = !strcmp(PR_GetString(OPA->string), PR_GetString(OPB->string));
BREAK
CASE(OP_EQ_E) OPC->flt = OPA->edict == OPB->edict; BREAK
CASE(OP_EQ_FNC) OPC->flt = OPA->func == OPB->func; BREAK
CASE(OP_NE_V)
OPC->flt = OPA->vec[0] != OPB->vec[0] ||
OPA->vec[1] != OPB->vec[1] ||
OPA->vec[2] != OPB->vec[2];
BREAK
CASE(OP_NE_S)
OPC->flt = strcmp(PR_GetString(OPA->string), PR_GetString(OPB->string));
BREAK
CASE(OP_NE_E) OPC->flt = OPA->edict != OPB->edict; BREAK
CASE(OP_NE_FNC) OPC->flt = OPA->func != OPB->func; BREAK
CASE(OP_STORE_F) OPB->flt = OPA->flt; BREAK
CASE(OP_STORE_ENT) OPB->edict = OPA->edict; BREAK
CASE(OP_STORE_FLD) OPB->field = OPA->field; BREAK
CASE(OP_STORE_S) OPB->string = OPA->string; BREAK
CASE(OP_STORE_FNC) OPB->func = OPA->func; BREAK
CASE(OP_STORE_V) VectorCopy(OPA->vec, OPB->vec); BREAK
CASE(OP_STOREP_F) PTR->flt = OPA->flt; BREAK
CASE(OP_STOREP_ENT) PTR->edict = OPA->edict; BREAK
CASE(OP_STOREP_FLD) PTR->field = OPA->field; BREAK
CASE(OP_STOREP_S) PTR->string = OPA->string; BREAK
CASE(OP_STOREP_FNC) PTR->func = OPA->func; BREAK
CASE(OP_STOREP_V) VectorCopy(OPA->vec, PTR->vec); BREAK
CASE(OP_ADDRESS)
ed = EDI;
#if defined(PARANOID)
NumForEdict(ed); // Make sure it's in range
#endif
if(ed == (edict_t *)sv.edicts && sv.state == ss_active)
{
pr_xstatement = st - pr_statements;
PR_RunError("assignment to world entity");
}
OPC->field = EdictProg(&ED_PField(ed, OPB->field));
BREAK
CASE(OP_LOAD_F) OPC->flt = ED_Float(EDI, OPB->field); BREAK
CASE(OP_LOAD_FLD) OPC->field = ED_PField(EDI, OPB->field); BREAK
CASE(OP_LOAD_ENT) OPC->edict = ED_PEdict(EDI, OPB->field); BREAK
CASE(OP_LOAD_S) OPC->string = ED_RString(EDI, OPB->field); BREAK
CASE(OP_LOAD_FNC) OPC->func = ED_Func(EDI, OPB->field); BREAK
CASE(OP_LOAD_V) VectorCopy(ED_Vector(EDI, OPB->field), OPC->vec); BREAK
CASE(OP_IFNOT) if(!OPA->_int) st += st->b - 1; BREAK
CASE(OP_IF) if(OPA->_int) st += st->b - 1; BREAK
CASE(OP_GOTO) st += st->a - 1; BREAK
CASE(OP_CALL0)
CASE(OP_CALL1)
CASE(OP_CALL2)
CASE(OP_CALL3)
CASE(OP_CALL4)
CASE(OP_CALL5)
CASE(OP_CALL6)
CASE(OP_CALL7)
CASE(OP_CALL8)
pr_xfunction->profile += profile - startprofile;
startprofile = profile;
pr_xstatement = st - pr_statements;
pr_argc = st->op - OP_CALL0;
if(!OPA->func)
PR_RunError("NULL function");
newf = &pr_functions[OPA->func];
if(newf->first_statement < 0)
{
// Built-in function
int32_t i = -newf->first_statement;
if(i >= pr_numbuiltins)
PR_RunError("Bad builtin call number %" PRIi32, i);
pr_builtins[i]();
BREAK
}
// Normal function
st = &pr_statements[PR_EnterFunction(newf)];
BREAK
CASE(OP_DONE)
CASE(OP_RETURN)
pr_xfunction->profile += profile - startprofile;
startprofile = profile;
pr_xstatement = st - pr_statements;
G_Float(GBL_RETURN + 0) = G_Float((uint16_t)st->a + 0);
G_Float(GBL_RETURN + 1) = G_Float((uint16_t)st->a + 1);
G_Float(GBL_RETURN + 2) = G_Float((uint16_t)st->a + 2);
st = &pr_statements[PR_LeaveFunction()];
if(pr_depth == exitdepth)
return;
BREAK
CASE(OP_STATE)
ed = ProgEdict(G_PEdict(GBL_self));
ED_Float(ed, ED_nextthink) = G_Float(GBL_time) + 0.1;
ED_Float(ed, ED_frame) = OPA->flt;
ED_Func(ed, ED_think) = OPB->func;
BREAK
END_GOTO_OP
}
}
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