Rewrite fork/resume logic to not bug out when the qc used alloca.
This commit is contained in:
Shpoike
parent
affb96a3b3
commit
6e35299bf8
2 changed files with 105 additions and 108 deletions
|
|
@ -1673,7 +1673,7 @@ reeval:
|
|||
break;
|
||||
case OP_PUSH: //note: OPA is words, not bytes.
|
||||
OPC->_int = ENGINEPOINTER(&prinst.localstack[prinst.localstack_used+prinst.spushed]);
|
||||
prinst.spushed += OPA->_int;
|
||||
prinst.spushed += OPA->_uint;
|
||||
if (prinst.spushed + prinst.localstack_used >= LOCALSTACK_SIZE)
|
||||
{
|
||||
i = prinst.spushed;
|
||||
|
|
@ -1683,7 +1683,7 @@ reeval:
|
|||
}
|
||||
break;
|
||||
/* case OP_POP:
|
||||
pr_spushed -= OPA->_int;
|
||||
pr_spushed -= OPA->_uint;
|
||||
if (pr_spushed < 0)
|
||||
{
|
||||
pr_spushed = 0;
|
||||
|
|
|
|||
|
|
@ -1919,99 +1919,130 @@ typedef struct qcthread_s {
|
|||
qcthreadstack_t fstack[MAX_STACK_DEPTH];
|
||||
int lstackused;
|
||||
int lstack[LOCALSTACK_SIZE];
|
||||
int xstatement;
|
||||
int xfunction;
|
||||
progsnum_t xprogs;
|
||||
} qcthread_t;
|
||||
|
||||
struct qcthread_s *PDECL PR_ForkStack(pubprogfuncs_t *ppf)
|
||||
{ //QC code can call builtins that call qc code.
|
||||
//to get around the problems of restoring the builtins we simply don't save the thread over the builtin.
|
||||
//this may be an error when OP_PUSH has been used.
|
||||
|
||||
progfuncs_t *progfuncs = (progfuncs_t*)ppf;
|
||||
int i, l;
|
||||
int i, pushed;
|
||||
int ed = prinst.exitdepth;
|
||||
int localsoffset, baselocalsoffset;
|
||||
qcthread_t *thread = externs->memalloc(sizeof(qcthread_t));
|
||||
const mfunction_t *f;
|
||||
|
||||
//notes:
|
||||
//pr_stack[prinst.exitdepth] is a dummy entry, with null function refs. we don't care about it.
|
||||
//pr_stack[pr_depth] is technically invalid but logically required - it refers to the current function instead. stoopid extra indirection.
|
||||
//[pr_depth] is the qc function that called whichever builtin we're executing right now so we want that (logical) one. [0] is irrelevant though.
|
||||
//entering a function copys its locals into the local stack for restoration on return, any OP_PUSHED stuff within the frame is then after that.
|
||||
//OP_PUSH/'pushed' is the PARENT function's pushes. f->locals stuff is the CHILD function's pushes.
|
||||
|
||||
//copy out the functions stack.
|
||||
for (i = 0,localsoffset=0; i < ed; i++)
|
||||
for (i = 1,localsoffset=0; i <= ed; i++)
|
||||
{
|
||||
if (i+1 == prinst.pr_depth)
|
||||
if (i == prinst.pr_depth)
|
||||
{
|
||||
localsoffset += prinst.spushed;
|
||||
|
||||
f = prinst.pr_xfunction;
|
||||
localsoffset += f->locals;
|
||||
}
|
||||
else
|
||||
f = prinst.pr_stack[i+1].f;
|
||||
localsoffset += f->locals; //this is where it crashes
|
||||
{
|
||||
localsoffset += prinst.pr_stack[i].pushed;
|
||||
|
||||
f = prinst.pr_stack[i].f;
|
||||
if (f)
|
||||
localsoffset += f->locals;
|
||||
}
|
||||
}
|
||||
//now we can start copying the stack.
|
||||
baselocalsoffset = localsoffset;
|
||||
for (i = ed; i < prinst.pr_depth; i++)
|
||||
thread->fstackdepth = 0;
|
||||
for (; i <= prinst.pr_depth; i++)
|
||||
{
|
||||
thread->fstack[i-ed].fnum = prinst.pr_stack[i].f - pr_progstate[prinst.pr_stack[i].progsnum].functions;
|
||||
thread->fstack[i-ed].progsnum = prinst.pr_stack[i].progsnum;
|
||||
thread->fstack[i-ed].statement = prinst.pr_stack[i].s;
|
||||
thread->fstack[i-ed].spushed = prinst.pr_stack[i].pushed;
|
||||
if (i == prinst.pr_depth)
|
||||
{ //top of the stack. whichever function called the builtin we're executing.
|
||||
thread->fstack[thread->fstackdepth].fnum = prinst.pr_xfunction - current_progstate->functions;
|
||||
thread->fstack[thread->fstackdepth].progsnum = prinst.pr_typecurrent;
|
||||
thread->fstack[thread->fstackdepth].statement = prinst.pr_xstatement;
|
||||
thread->fstack[thread->fstackdepth].spushed = prinst.spushed;
|
||||
thread->fstackdepth++;
|
||||
|
||||
if (i+1 == prinst.pr_depth)
|
||||
localsoffset += prinst.spushed;
|
||||
f = prinst.pr_xfunction;
|
||||
localsoffset += f->locals;
|
||||
}
|
||||
else
|
||||
f = prinst.pr_stack[i+1].f;
|
||||
localsoffset += f->locals;
|
||||
{
|
||||
thread->fstack[thread->fstackdepth].fnum = prinst.pr_stack[i].f - pr_progstate[prinst.pr_stack[i].progsnum].functions;
|
||||
thread->fstack[thread->fstackdepth].progsnum = prinst.pr_stack[i].progsnum;
|
||||
thread->fstack[thread->fstackdepth].statement = prinst.pr_stack[i].s;
|
||||
thread->fstack[thread->fstackdepth].spushed = prinst.pr_stack[i].pushed;
|
||||
thread->fstackdepth++;
|
||||
|
||||
localsoffset += prinst.pr_stack[i].pushed;
|
||||
f = prinst.pr_stack[i].f;
|
||||
localsoffset += f->locals;
|
||||
}
|
||||
}
|
||||
thread->fstackdepth = prinst.pr_depth - ed;
|
||||
|
||||
for (i = prinst.pr_depth - 1; i >= ed ; i--)
|
||||
//we now know how many locals we need... but life is not easy.
|
||||
//preserving on entry means the definitive location is the pr_globals - and they'll have been 'corrupted' by any child functions.
|
||||
//so we need to unwind(rewind) them here to find their proper 'current' values, so that resumption can rebuild the execution stack on resume to revert them properly to their prior values. messy.
|
||||
for (i = prinst.pr_depth; i > ed ; i--)
|
||||
{
|
||||
if (i+1 == prinst.pr_depth)
|
||||
f = prinst.pr_xfunction;
|
||||
if (i == prinst.pr_depth)
|
||||
f = prinst.pr_xfunction, pushed = prinst.spushed;
|
||||
else
|
||||
f = prinst.pr_stack[i+1].f;
|
||||
f = prinst.pr_stack[i].f, pushed = prinst.pr_stack[i].pushed;
|
||||
|
||||
//preseve any OP_PUSH stuff
|
||||
localsoffset -= pushed;
|
||||
memcpy(&thread->lstack[localsoffset-baselocalsoffset], prinst.localstack+localsoffset, pushed*sizeof(int));
|
||||
|
||||
//preserve the current locals
|
||||
localsoffset -= f->locals;
|
||||
for (l = 0; l < f->locals; l++)
|
||||
{
|
||||
thread->lstack[localsoffset-baselocalsoffset + l ] = ((int *)pr_globals)[f->parm_start + l];
|
||||
((int *)pr_globals)[f->parm_start + l] = prinst.localstack[localsoffset+l]; //copy the old value into the globals (so the older functions have the correct locals.
|
||||
}
|
||||
memcpy(&thread->lstack[localsoffset-baselocalsoffset], ((int *)pr_globals)+f->parm_start, f->locals*sizeof(int));
|
||||
//unwind the locals so parent functions we preserve have the proper current values.
|
||||
memcpy(((int *)pr_globals)+f->parm_start, prinst.localstack+localsoffset, f->locals*sizeof(int));
|
||||
}
|
||||
|
||||
for (i = ed; i < prinst.pr_depth ; i++) //we need to get the locals back to how they were.
|
||||
//rewind the locals so they don't get corrupt when returning from fork etc.
|
||||
for (i = ed+1; i <= prinst.pr_depth ; i++) //we need to get the locals back to how they were.
|
||||
{
|
||||
if (i+1 == prinst.pr_depth)
|
||||
f = prinst.pr_xfunction;
|
||||
if (i == prinst.pr_depth)
|
||||
f = prinst.pr_xfunction, pushed = prinst.spushed;
|
||||
else
|
||||
f = prinst.pr_stack[i+1].f;
|
||||
f = prinst.pr_stack[i].f, pushed = prinst.pr_stack[i].pushed;
|
||||
|
||||
for (l = 0; l < f->locals; l++)
|
||||
{
|
||||
((int *)pr_globals)[f->parm_start + l] = thread->lstack[localsoffset-baselocalsoffset + l];
|
||||
}
|
||||
memcpy(((int *)pr_globals)+f->parm_start, &thread->lstack[localsoffset-baselocalsoffset], f->locals*sizeof(int));
|
||||
localsoffset += f->locals;
|
||||
|
||||
localsoffset += pushed; //we didn't need to clobber this, just skip it to avoid corrupting.
|
||||
}
|
||||
thread->lstackused = localsoffset - baselocalsoffset;
|
||||
|
||||
thread->xstatement = prinst.pr_xstatement;
|
||||
thread->xfunction = prinst.pr_xfunction - current_progstate->functions;
|
||||
thread->xprogs = prinst.pr_typecurrent;
|
||||
|
||||
return thread;
|
||||
}
|
||||
|
||||
void PDECL PR_ResumeThread (pubprogfuncs_t *ppf, struct qcthread_s *thread)
|
||||
{
|
||||
progfuncs_t *progfuncs = (progfuncs_t*)ppf;
|
||||
mfunction_t *f, *oldf;
|
||||
int i,l,ls, olds, oldp;
|
||||
progsnum_t initial_progs;
|
||||
mfunction_t *f;
|
||||
int i;
|
||||
progsnum_t initial_progs = prinst.pr_typecurrent;
|
||||
unsigned int initial_stack;
|
||||
int oldexitdepth;
|
||||
int *glob;
|
||||
|
||||
int s;
|
||||
#ifndef QCGC
|
||||
int tempdepth;
|
||||
#endif
|
||||
|
||||
progsnum_t prnum = thread->xprogs;
|
||||
int fnum = thread->xfunction;
|
||||
|
||||
if (prinst.localstack_used + thread->lstackused > LOCALSTACK_SIZE)
|
||||
PR_RunError(&progfuncs->funcs, "Too many locals on resumtion of QC thread\n");
|
||||
|
||||
|
|
@ -2020,79 +2051,48 @@ void PDECL PR_ResumeThread (pubprogfuncs_t *ppf, struct qcthread_s *thread)
|
|||
|
||||
|
||||
//do progs switching stuff as appropriate. (fteqw only)
|
||||
initial_progs = prinst.pr_typecurrent;
|
||||
PR_SwitchProgsParms(progfuncs, prnum);
|
||||
|
||||
|
||||
oldexitdepth = prinst.exitdepth;
|
||||
prinst.exitdepth = prinst.pr_depth;
|
||||
|
||||
ls = 0;
|
||||
initial_stack = prinst.localstack_used;
|
||||
//add on the callstack.
|
||||
for (i = 0; i < thread->fstackdepth; i++)
|
||||
{
|
||||
if (prinst.pr_depth == prinst.exitdepth)
|
||||
{
|
||||
prinst.pr_stack[prinst.pr_depth].f = prinst.pr_xfunction;
|
||||
prinst.pr_stack[prinst.pr_depth].s = prinst.pr_xstatement;
|
||||
prinst.pr_stack[prinst.pr_depth].progsnum = initial_progs;
|
||||
prinst.pr_stack[prinst.pr_depth].pushed = prinst.spushed;
|
||||
}
|
||||
else
|
||||
{
|
||||
prinst.pr_stack[prinst.pr_depth].progsnum = thread->fstack[i].progsnum;
|
||||
prinst.pr_stack[prinst.pr_depth].f = pr_progstate[thread->fstack[i].progsnum].functions + thread->fstack[i].fnum;
|
||||
prinst.pr_stack[prinst.pr_depth].s = thread->fstack[i].statement;
|
||||
prinst.pr_stack[prinst.pr_depth].pushed = thread->fstack[i].spushed;
|
||||
}
|
||||
|
||||
if (i+1 == thread->fstackdepth)
|
||||
{
|
||||
f = &pr_cp_functions[fnum];
|
||||
glob = (int*)pr_globals;
|
||||
}
|
||||
else
|
||||
{
|
||||
f = pr_progstate[thread->fstack[i+1].progsnum].functions + thread->fstack[i+1].fnum;
|
||||
glob = (int*)pr_progstate[thread->fstack[i+1].progsnum].globals;
|
||||
}
|
||||
for (l = 0; l < f->locals; l++)
|
||||
{
|
||||
prinst.localstack[prinst.localstack_used++] = glob[f->parm_start + l];
|
||||
glob[f->parm_start + l] = thread->lstack[ls++];
|
||||
}
|
||||
|
||||
//make the new stack frame from the working values so stuff gets restored properly...
|
||||
prinst.pr_stack[prinst.pr_depth].f = prinst.pr_xfunction;
|
||||
prinst.pr_stack[prinst.pr_depth].s = prinst.pr_xstatement;
|
||||
prinst.pr_stack[prinst.pr_depth].progsnum = initial_progs;
|
||||
prinst.pr_stack[prinst.pr_depth].pushed = prinst.spushed;
|
||||
prinst.pr_depth++;
|
||||
|
||||
//restore the OP_PUSH data
|
||||
memcpy(&prinst.localstack[prinst.localstack_used], &thread->lstack[prinst.localstack_used-initial_stack], prinst.spushed*sizeof(int));
|
||||
prinst.localstack_used += prinst.spushed;
|
||||
|
||||
//and refill the working values from the inbound stack
|
||||
PR_SwitchProgs(progfuncs, thread->fstack[i].progsnum);
|
||||
prinst.pr_xfunction = pr_progstate[thread->fstack[i].progsnum].functions + thread->fstack[i].fnum;
|
||||
prinst.pr_xstatement = thread->fstack[i].statement;
|
||||
prinst.spushed = thread->fstack[i].spushed;
|
||||
|
||||
f = pr_progstate[thread->fstack[i].progsnum].functions + thread->fstack[i].fnum;
|
||||
glob = (int*)pr_progstate[thread->fstack[i].progsnum].globals;
|
||||
|
||||
//copy the 'new' function's current globals into the local stack for restoration
|
||||
memcpy(&prinst.localstack[prinst.localstack_used], &glob[f->parm_start], sizeof(int)*f->locals);
|
||||
//and overwrite them with the saved values.
|
||||
memcpy(&glob[f->parm_start], &thread->lstack[prinst.localstack_used-initial_stack], sizeof(int)*f->locals);
|
||||
prinst.localstack_used += f->locals;
|
||||
}
|
||||
|
||||
if (ls != thread->lstackused)
|
||||
if (prinst.localstack_used-initial_stack != thread->lstackused)
|
||||
PR_RunError(&progfuncs->funcs, "Thread stores incorrect locals count\n");
|
||||
|
||||
|
||||
f = &pr_cp_functions[fnum];
|
||||
|
||||
// thread->lstackused -= f->locals; //the current function is the odd one out.
|
||||
|
||||
//add on the locals stack
|
||||
// memcpy(prinst.localstack+prinst.localstack_used, thread->lstack, sizeof(int)*thread->lstackused);
|
||||
// prinst.localstack_used += thread->lstackused;
|
||||
|
||||
//bung the locals of the current function on the stack.
|
||||
// for (i=0 ; i < f->locals ; i++)
|
||||
// ((int *)pr_globals)[f->parm_start + i] = 0xff00ff00;//thread->lstack[thread->lstackused+i];
|
||||
|
||||
|
||||
// PR_EnterFunction (progfuncs, f, initial_progs);
|
||||
oldf = prinst.pr_xfunction;
|
||||
olds = prinst.pr_xstatement;
|
||||
oldp = prinst.spushed;
|
||||
prinst.pr_xfunction = f;
|
||||
s = thread->xstatement;
|
||||
|
||||
#ifndef QCGC
|
||||
tempdepth = prinst.numtempstringsstack;
|
||||
#endif
|
||||
PR_ExecuteCode(progfuncs, s);
|
||||
PR_ExecuteCode(progfuncs, prinst.pr_xstatement);
|
||||
|
||||
|
||||
PR_SwitchProgsParms(progfuncs, initial_progs);
|
||||
|
|
@ -2102,9 +2102,6 @@ void PDECL PR_ResumeThread (pubprogfuncs_t *ppf, struct qcthread_s *thread)
|
|||
#endif
|
||||
|
||||
prinst.exitdepth = oldexitdepth;
|
||||
prinst.pr_xfunction = oldf;
|
||||
prinst.pr_xstatement = olds;
|
||||
prinst.spushed = oldp;
|
||||
}
|
||||
|
||||
void PDECL PR_AbortStack (pubprogfuncs_t *ppf)
|
||||
|
|
|
|||
Loading…
Reference in a new issue