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fteqw/engine/qclib/pr_x86.c

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/*
when I say JIT, I mean load time, not execution time.
notes:
qc jump offsets are all constants. we have no variable offset jumps (other than function calls/returns)
field remapping... fields are in place, and cannot be adjusted. if a field is not set to 0, its assumed to be a constant.
optimisations:
none at the moment...
instructions need to be chained. stuff that writes to C should be cacheable, etc. maybe we don't even need to do the write to C
it should also be possible to fold in eq+ifnot, so none of this silly storeing of floats in equality tests
eax - tmp
ebx - prinst->edicttable
ecx - tmp
edx - tmp
esi -
edi - tmp (because its preserved by subfunctions
ebp -
to use gas to provide binary opcodes:
vim -N blob.s && as blob.s && objdump.exe -d a.out
*/
#define PROGSUSED
#include "progsint.h"
#ifdef QCJIT
static float ta, tb, nullfloat=0;
unsigned int *statementjumps; //[MAX_STATEMENTS*2]
unsigned char **statementoffsets; //[MAX_STATEMENTS]
unsigned int numjumps;
unsigned char *code;
unsigned int codesize;
unsigned int jitstatements;
void EmitByte(unsigned char byte)
{
code[codesize++] = byte;
}
void Emit4Byte(unsigned int value)
{
code[codesize++] = (value>> 0)&0xff;
code[codesize++] = (value>> 8)&0xff;
code[codesize++] = (value>>16)&0xff;
code[codesize++] = (value>>24)&0xff;
}
void EmitAdr(void *value)
{
Emit4Byte((unsigned int)value);
}
void EmitFloat(float value)
{
union {float f; unsigned int i;} u;
u.f = value;
Emit4Byte(u.i);
}
void Emit2Byte(unsigned short value)
{
code[codesize++] = (value>> 0)&0xff;
code[codesize++] = (value>> 8)&0xff;
}
void EmitFOffset(void *func, int bias)
{
union {void *f; unsigned int i;} u;
u.f = func;
u.i -= (unsigned int)&code[codesize+bias];
Emit4Byte(u.i);
}
void Emit4ByteJump(int statementnum, int offset)
{
statementjumps[numjumps++] = codesize;
statementjumps[numjumps++] = statementnum;
statementjumps[numjumps++] = offset;
//the offset is filled in later
codesize += 4;
}
void FixupJumps(void)
{
unsigned int j;
unsigned char *codesrc;
unsigned char *codedst;
unsigned int offset;
unsigned int v;
for (j = 0; j < numjumps;)
{
v = statementjumps[j++];
codesrc = &code[v];
v = statementjumps[j++];
codedst = statementoffsets[v];
v = statementjumps[j++];
offset = (int)(codedst - (codesrc-v)); //3rd term because the jump is relative to the instruction start, not the instruction's offset
codesrc[0] = (offset>> 0)&0xff;
codesrc[1] = (offset>> 8)&0xff;
codesrc[2] = (offset>>16)&0xff;
codesrc[3] = (offset>>24)&0xff;
}
}
int PR_LeaveFunction (progfuncs_t *progfuncs);
int PR_EnterFunction (progfuncs_t *progfuncs, dfunction_t *f, int progsnum);
pbool PR_GenerateJit(progfuncs_t *progfuncs)
{
unsigned int i;
dstatement16_t *op = (dstatement16_t*)current_progstate->statements;
unsigned int numstatements = current_progstate->progs->numstatements;
int *glob = (int*)current_progstate->globals;
if (current_progstate->numbuiltins)
return;
jitstatements = numstatements;
statementjumps = malloc(numstatements*12);
statementoffsets = malloc(numstatements*4);
code = malloc(numstatements*500);
numjumps = 0;
codesize = 0;
for (i = 0; i < numstatements; i++)
{
statementoffsets[i] = &code[codesize];
switch(op[i].op)
{
//jumps
case OP_IF:
//integer compare
//if a, goto b
//cmpl $0,glob[A]
EmitByte(0x83);EmitByte(0x3d);EmitAdr(glob + op[i].a);EmitByte(0x0);
//jnz B
EmitByte(0x0f);EmitByte(0x85);Emit4ByteJump(i + (signed short)op[i].b, -4);
break;
case OP_IFNOT:
//integer compare
//if !a, goto b
//cmpl $0,glob[A]
EmitByte(0x83);EmitByte(0x3d);EmitAdr(glob + op[i].a);EmitByte(0x0);
//jz B
EmitByte(0x0f);EmitByte(0x84);Emit4ByteJump(i + (signed short)op[i].b, -4);
break;
case OP_GOTO:
EmitByte(0xE9);Emit4ByteJump(i + (signed short)op[i].a, -4);
break;
//function returns
case OP_DONE:
case OP_RETURN:
//done and return are the same
//part 1: store A into OFS_RETURN
if (!op[i].a)
{
//assumption: anything that returns address 0 is a void or zero return.
//thus clear eax and copy that to the return vector.
EmitByte(0x31);EmitByte(0xc0);
EmitByte(0xa3);EmitAdr(glob + OFS_RETURN+0);
EmitByte(0xa3);EmitAdr(glob + OFS_RETURN+1);
EmitByte(0xa3);EmitAdr(glob + OFS_RETURN+2);
}
else
{
//movl glob[A+0],eax
EmitByte(0xa1);EmitAdr(glob + op[i].a+0);
//movl glob[A+0],edx
EmitByte(0x8b);EmitByte(0x0d);EmitAdr(glob + op[i].a+1);
//movl glob[A+0],ecx
EmitByte(0x8b);EmitByte(0x15);EmitAdr(glob + op[i].a+2);
//movl eax, glob[OFS_RET+0]
EmitByte(0xa3);EmitAdr(glob + OFS_RETURN+0);
//movl edx, glob[OFS_RET+0]
EmitByte(0x89);EmitByte(0x15);EmitAdr(glob + OFS_RETURN+1);
//movl ecx, glob[OFS_RET+0]
EmitByte(0x89);EmitByte(0x15);EmitAdr(glob + OFS_RETURN+2);
}
//call leavefunction to get the return address
// pushl progfuncs
EmitByte(0x68);EmitAdr(progfuncs);
// call PR_LeaveFunction
EmitByte(0xe8);EmitFOffset(PR_LeaveFunction, 4);
// add $4,%esp
EmitByte(0x83);EmitByte(0xc4);EmitByte(0x04);
// movl pr_depth,%edx
EmitByte(0x8b);EmitByte(0x15);EmitAdr(&pr_depth);
// cmp prinst->exitdepth,%edx
EmitByte(0x3b);EmitByte(0x15);EmitAdr(&prinst->exitdepth);
// je returntoc
EmitByte(0x74);EmitByte(0x09);
// mov statementoffsets[%eax*4],%eax
EmitByte(0x8b);EmitByte(0x04);EmitByte(0x85);EmitAdr(statementoffsets+1);
// jmp eax
EmitByte(0xff);EmitByte(0xe0);
// returntoc:
// ret
EmitByte(0xc3);
break;
//function calls
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:
//save the state in place the rest of the engine can cope with
//movl $i, pr_xstatement
EmitByte(0xc7);EmitByte(0x05);EmitAdr(&pr_xstatement);Emit4Byte(i);
//movl $(op[i].op-OP_CALL0), pr_argc
EmitByte(0xc7);EmitByte(0x05);EmitAdr(&pr_argc);Emit4Byte(op[i].op-OP_CALL0);
//figure out who we're calling, and what that involves
//%eax = glob[A]
EmitByte(0xa1); EmitAdr(glob + op[i].a);
//eax is now the func num
//mov %eax,%ecx
EmitByte(0x89); EmitByte(0xc1);
//shr $24,%ecx
EmitByte(0xc1); EmitByte(0xe9); EmitByte(0x18);
//ecx is now the progs num for the new func
//cmp %ecx,pr_typecurrent
EmitByte(0x39); EmitByte(0x0d); EmitAdr(&pr_typecurrent);
//je sameprogs
EmitByte(0x74); EmitByte(0x3);
{
//can't handle switching progs
//FIXME: recurse though PR_ExecuteProgram
//push eax
//push progfuncs
//call PR_ExecuteProgram
//add $8,%esp
//remember to change the je above
//err... exit depth? no idea
EmitByte(0xcd);EmitByte(op[i].op);
//ret
EmitByte(0xc3);
}
//sameprogs:
//andl $0x00ffffff, %eax
EmitByte(0x25);Emit4Byte(0x00ffffff);
//mov $sizeof(dfunction_t),%edx
EmitByte(0xba);Emit4Byte(sizeof(dfunction_t));
//mul %edx
EmitByte(0xf7); EmitByte(0xe2);
//add pr_functions,%eax
EmitByte(0x05); EmitAdr(pr_functions);
//eax is now the dfunction_t to be called
//edx is clobbered.
//mov (%eax),%edx
EmitByte(0x8b);EmitByte(0x10);
//edx is now the first statement number
//cmp $0,%edx
EmitByte(0x83);EmitByte(0xfa);EmitByte(0x00);
//jl isabuiltin
EmitByte(0x7c);EmitByte(22);
{
//push %ecx
EmitByte(0x51);
//push %eax
EmitByte(0x50);
//pushl progfuncs
EmitByte(0x68);EmitAdr(progfuncs);
//call PR_EnterFunction
EmitByte(0xe8);EmitFOffset(PR_EnterFunction, 4);
//sub $12,%esp
EmitByte(0x83);EmitByte(0xc4);EmitByte(0xc);
//eax is now the next statement number (first of the new function, usually equal to ecx, but not always)
//jmp statementoffsets[%eax*4]
EmitByte(0xff);EmitByte(0x24);EmitByte(0x85);EmitAdr(statementoffsets+1);
}
//isabuiltin:
//push current_progstate->globals
EmitByte(0x68);EmitAdr(current_progstate->globals);
//push progfuncs
EmitByte(0x68);EmitAdr(progfuncs);
//neg %edx
EmitByte(0xf7);EmitByte(0xda);
//call externs->globalbuiltins[%edx,4]
//FIXME: make sure this dereferences
EmitByte(0xff);EmitByte(0x14);EmitByte(0x95);EmitAdr(externs->globalbuiltins);
//add $8,%esp
EmitByte(0x83);EmitByte(0xc4);EmitByte(0x8);
//but that builtin might have been Abort()
//mov prinst->continuestatement,%eax
EmitByte(0xa1);EmitAdr(&prinst->continuestatement);
//eax is now prinst->continuestatement
//cmp $-1,%eax
EmitByte(0x83);EmitByte(0xf8);EmitByte(0xff);
//je donebuiltincall
EmitByte(0x74);EmitByte(10+8);
{
EmitByte(0xcc);
//jmp statementoffsets[%eax*4]
EmitByte(0xff);EmitByte(0x24);EmitByte(0x85);EmitAdr(statementoffsets+1);
//mov $-1,prinst->continuestatement
EmitByte(0xc7);EmitByte(0x05);EmitAdr(&prinst->continuestatement+1);Emit4Byte((unsigned int)-1);
}
//donebuiltincall:
break;
case OP_MUL_F:
//flds glob[A]
EmitByte(0xd9);EmitByte(0x05);EmitAdr(glob + op[i].a);
//fmuls glob[B]
EmitByte(0xd8);EmitByte(0x0d);EmitAdr(glob + op[i].b);
//fstps glob[C]
EmitByte(0xd9);EmitByte(0x1d);EmitAdr(glob + op[i].c);
break;
case OP_DIV_F:
//flds glob[A]
EmitByte(0xd9);EmitByte(0x05);EmitAdr(glob + op[i].a);
//fdivs glob[B]
EmitByte(0xd8);EmitByte(0x35);EmitAdr(glob + op[i].b);
//fstps glob[C]
EmitByte(0xd9);EmitByte(0x1d);EmitAdr(glob + op[i].c);
break;
case OP_ADD_F:
//flds glob[A]
EmitByte(0xd9);EmitByte(0x05);EmitAdr(glob + op[i].a);
//fadds glob[B]
EmitByte(0xd8);EmitByte(0x05);EmitAdr(glob + op[i].b);
//fstps glob[C]
EmitByte(0xd9);EmitByte(0x1d);EmitAdr(glob + op[i].c);
break;
case OP_SUB_F:
//flds glob[A]
EmitByte(0xd9);EmitByte(0x05);EmitAdr(glob + op[i].a);
//fsubs glob[B]
EmitByte(0xd8);EmitByte(0x25);EmitAdr(glob + op[i].b);
//fstps glob[C]
EmitByte(0xd9);EmitByte(0x1d);EmitAdr(glob + op[i].c);
break;
case OP_NOT_F:
//flds glob[A]
EmitByte(0xd9);EmitByte(0x05);EmitAdr(glob + op[i].a);
//fldz
EmitByte(0xd9);EmitByte(0xee);
//fnstsw %ax
EmitByte(0xdf);EmitByte(0xe0);
//testb 0x40,%ah
EmitByte(0xf6);EmitByte(0xc4);EmitByte(0x40);
//je noteq
EmitByte(0x74);EmitByte(0x0c);
//movl 1.0f,glob[C]
EmitByte(0xc7);EmitByte(0x05);EmitAdr(glob + op[i].c);EmitFloat(0.0f);
//jmp end
EmitByte(0xeb);EmitByte(0x0a);
//noteq:
//movl 0.0f,glob[C]
EmitByte(0xc7);EmitByte(0x05);EmitAdr(glob + op[i].c);EmitFloat(1.0f);
//end:
break;
case OP_STORE_F:
case OP_STORE_S:
case OP_STORE_ENT:
case OP_STORE_FLD:
case OP_STORE_FNC:
//movl glob[A],eax
EmitByte(0xa1);EmitAdr(glob + op[i].a);
//movl eax,glob[B]
EmitByte(0xa3);EmitAdr(glob + op[i].b);
break;
case OP_STORE_V:
//movl glob[A+0],eax
EmitByte(0xa1);EmitAdr(glob + op[i].a+0);
//movl glob[A+1],edx
EmitByte(0x8b);EmitByte(0x0d);EmitAdr(glob + op[i].a+1);
//movl glob[A+2],ecx
EmitByte(0x8b);EmitByte(0x15);EmitAdr(glob + op[i].a+2);
//movl eax, glob[B+0]
EmitByte(0xa3);EmitAdr(glob + op[i].b+0);
//movl edx, glob[B+1]
EmitByte(0x89);EmitByte(0x15);EmitAdr(glob + op[i].b+1);
//movl ecx, glob[B+2]
EmitByte(0x89);EmitByte(0x15);EmitAdr(glob + op[i].b+2);
break;
case OP_LOAD_F:
case OP_LOAD_S:
case OP_LOAD_ENT:
case OP_LOAD_FLD:
case OP_LOAD_FNC:
case OP_LOAD_V:
//a is the ent number, b is the field
//c is the dest
//movl glob[A+0],eax
EmitByte(0xa1);EmitAdr(glob + op[i].a);
//mov glob[B],ecx
EmitByte(0x8b); EmitByte(0x0d);EmitAdr(glob + op[i].b);
//FIXME: bound eax (ent number)
//FIXME: bound ecx (field index)
//mov (ebx,eax,4).%eax
EmitByte(0x8b); EmitByte(0x04); EmitByte(0x83);
//eax is now an edictrun_t
//mov fields(,%eax,4),%edx
EmitByte(0x8b);EmitByte(0x50);EmitByte((int)&((edictrun_t*)NULL)->fields);
//edx is now the field array for that ent
//mov fieldajust(%edx,%ecx,4),%eax //offset = progfuncs->fieldadjust
EmitByte(0x8b); EmitByte(0x84); EmitByte(0x8a); Emit4Byte(progfuncs->fieldadjust*4);
//mov edx,glob[C]
EmitByte(0xa3);EmitAdr(glob + op[i].c);
if (op[i].op == OP_LOAD_V)
{
//mov fieldajust+4(%edx,%ecx,4),%eax //offset = progfuncs->fieldadjust
EmitByte(0x8b); EmitByte(0x84); EmitByte(0x8a); Emit4Byte(4+progfuncs->fieldadjust*4);
//mov edx,glob[C+1]
EmitByte(0xa3);EmitAdr(glob + op[i].c+1);
//mov fieldajust+8(%edx,%ecx,4),%eax //offset = progfuncs->fieldadjust
EmitByte(0x8b); EmitByte(0x84); EmitByte(0x8a); Emit4Byte(4+progfuncs->fieldadjust*4);
//mov edx,glob[C+1]
EmitByte(0xa3);EmitAdr(glob + op[i].c+2);
}
break;
case OP_ADDRESS:
//a is the ent number, b is the field
//c is the dest
//movl glob[A+0],eax
EmitByte(0xa1);EmitAdr(glob + op[i].a);
//mov glob[B],ecx
EmitByte(0x8b); EmitByte(0x0d);EmitAdr(glob + op[i].b);
//FIXME: bound eax (ent number)
//FIXME: bound ecx (field index)
//mov (ebx,eax,4).%eax
EmitByte(0x8b); EmitByte(0x04); EmitByte(0x83);
//eax is now an edictrun_t
//mov fields(,%eax,4),%edx
EmitByte(0x8b);EmitByte(0x50);EmitByte((int)&((edictrun_t*)NULL)->fields);
//edx is now the field array for that ent
//mov fieldajust(%edx,%ecx,4),%eax //offset = progfuncs->fieldadjust
//EmitByte(0x8d); EmitByte(0x84); EmitByte(0x8a); EmitByte(progfuncs->fieldadjust*4);
EmitByte(0x8d); EmitByte(0x84); EmitByte(0x8a); Emit4Byte(progfuncs->fieldadjust*4);
//mov edx,glob[C]
EmitByte(0xa3);EmitAdr(glob + op[i].c);
break;
case OP_STOREP_F:
case OP_STOREP_S:
case OP_STOREP_ENT:
case OP_STOREP_FLD:
case OP_STOREP_FNC:
//movl glob[A],eax
EmitByte(0xa1);EmitAdr(glob + op[i].a);
//mov glob[B],ecx
EmitByte(0x8b); EmitByte(0x0d);EmitAdr(glob + op[i].b);
//mov %eax,(%ecx)
EmitByte(0x89);EmitByte(0x01);
break;
case OP_STOREP_V:
//mov glob[B],ecx
EmitByte(0x8b); EmitByte(0x0d);EmitAdr(glob + op[i].b);
//movl glob[A],eax
EmitByte(0xa1);EmitAdr(glob + op[i].a+0);
//mov %eax,0(%ecx)
EmitByte(0x89);EmitByte(0x01);
//movl glob[A],eax
EmitByte(0xa1);EmitAdr(glob + op[i].a+0);
//mov %eax,4(%ecx)
EmitByte(0x89);EmitByte(0x41);EmitByte(0x04);
//movl glob[A],eax
EmitByte(0xa1);EmitAdr(glob + op[i].a+0);
//mov %eax,8(%ecx)
EmitByte(0x89);EmitByte(0x41);EmitByte(0x08);
break;
case OP_EQ_E:
case OP_EQ_FNC:
//integer equality
//movl glob[A],%eax
EmitByte(0xa1);EmitAdr(glob + op[i].a);
//cmp glob[B],%eax
EmitByte(0x3b); EmitByte(0x0f); EmitAdr(glob + op[i].b);
//je 12
EmitByte(0x74);EmitByte(0x0c);
//mov 0.0f,glob[C]
EmitByte(0xc7);EmitByte(0x05); EmitAdr(glob + op[i].a);EmitFloat(0.0f);
//jmp 10
EmitByte(0xeb);EmitByte(0x0a);
//mov 1.0f,glob[C]
EmitByte(0xc7);EmitByte(0x05); EmitAdr(glob + op[i].a);EmitFloat(1.0f);
break;
case OP_NE_E:
case OP_NE_FNC:
//integer equality
//movl glob[A],%eax
EmitByte(0xa1);EmitAdr(glob + op[i].a);
//cmp glob[B],%eax
EmitByte(0x3b); EmitByte(0x0f); EmitAdr(glob + op[i].b);
//je 12
EmitByte(0x74);EmitByte(0x0c);
//mov 0.0f,glob[C]
EmitByte(0xc7);EmitByte(0x05); EmitAdr(glob + op[i].a);EmitFloat(1.0f);
//jmp 10
EmitByte(0xeb);EmitByte(0x0a);
//mov 1.0f,glob[C]
EmitByte(0xc7);EmitByte(0x05); EmitAdr(glob + op[i].a);EmitFloat(0.0f);
break;
case OP_NOT_ENT:
case OP_NOT_FNC:
//cmp glob[B],%eax
EmitByte(0x8c); EmitByte(0x3d); EmitAdr(glob + op[i].a);EmitByte(0x00);
//je 12
EmitByte(0x74);EmitByte(0x0c);
//mov 0.0f,glob[C]
EmitByte(0xc7);EmitByte(0x05); EmitAdr(glob + op[i].a);EmitFloat(0.0f);
//jmp 10
EmitByte(0xeb);EmitByte(0x0a);
//mov 1.0f,glob[C]
EmitByte(0xc7);EmitByte(0x05); EmitAdr(glob + op[i].a);EmitFloat(1.0f);
break;
case OP_BITOR: //floats...
//flds glob[A]
EmitByte(0xd9); EmitByte(0x05);EmitAdr(glob + op[i].a);
//flds glob[B]
EmitByte(0xd9); EmitByte(0x05);EmitAdr(glob + op[i].b);
//fistp tb
EmitByte(0xdf); EmitByte(0x1d);EmitAdr(&tb);
//fistp ta
EmitByte(0xdf); EmitByte(0x1d);EmitAdr(&ta);
//mov ta,%eax
EmitByte(0xa1); EmitAdr(&ta);
//and tb,%eax
EmitByte(0x09); EmitByte(0x05);EmitAdr(&tb);
//fild tb
EmitByte(0xdf); EmitByte(0x05);EmitAdr(&tb);
//fstps glob[C]
EmitByte(0xd9); EmitByte(0x1d);EmitAdr(glob + op[i].c);
break;
case OP_BITAND:
//flds glob[A]
EmitByte(0xd9); EmitByte(0x05);EmitAdr(glob + op[i].a);
//flds glob[B]
EmitByte(0xd9); EmitByte(0x05);EmitAdr(glob + op[i].b);
//fistp tb
EmitByte(0xdf); EmitByte(0x1d);EmitAdr(&tb);
//fistp ta
EmitByte(0xdf); EmitByte(0x1d);EmitAdr(&ta);
//mov ta,%eax
EmitByte(0xa1); EmitAdr(&ta);
//and tb,%eax
EmitByte(0x21); EmitByte(0x05);EmitAdr(&tb);
//fild tb
EmitByte(0xdf); EmitByte(0x05);EmitAdr(&tb);
//fstps glob[C]
EmitByte(0xd9); EmitByte(0x1d);EmitAdr(glob + op[i].c);
break;
case OP_AND:
//test floats properly, so we don't get confused with -0.0
//flds glob[A]
EmitByte(0xd9); EmitByte(0x05); EmitAdr(glob + op[i].a);
//fcomps nullfloat
EmitByte(0xd8); EmitByte(0x1d); EmitAdr(&nullfloat);
//fnstsw %ax
EmitByte(0xdf); EmitByte(0xe0);
//test $0x40,%ah
EmitByte(0xf6); EmitByte(0xc4);EmitByte(0x40);
//je onefalse
EmitByte(0x75); EmitByte(0x1f);
//flds glob[B]
EmitByte(0xd9); EmitByte(0x05); EmitAdr(glob + op[i].b);
//fcomps nullfloat
EmitByte(0xd8); EmitByte(0x1d); EmitAdr(&nullfloat);
//fnstsw %ax
EmitByte(0xdf); EmitByte(0xe0);
//test $0x40,%ah
EmitByte(0xf6); EmitByte(0xc4);EmitByte(0x40);
//jne onefalse
EmitByte(0x75); EmitByte(0x0c);
//mov float0,glob[C]
EmitByte(0xc7); EmitByte(0x05); EmitAdr(glob + op[i].c); EmitFloat(1.0f);
//jmp done
EmitByte(0xeb); EmitByte(0x0a);
//onefalse:
//mov float1,glob[C]
EmitByte(0xc7); EmitByte(0x05); EmitAdr(glob + op[i].c); EmitFloat(0.0f);
//done:
break;
case OP_OR:
//test floats properly, so we don't get confused with -0.0
//flds glob[A]
EmitByte(0xd9); EmitByte(0x05); EmitAdr(glob + op[i].a);
//fcomps nullfloat
EmitByte(0xd8); EmitByte(0x1d); EmitAdr(&nullfloat);
//fnstsw %ax
EmitByte(0xdf); EmitByte(0xe0);
//test $0x40,%ah
EmitByte(0xf6); EmitByte(0xc4);EmitByte(0x40);
//je onetrue
EmitByte(0x74); EmitByte(0x1f);
//flds glob[B]
EmitByte(0xd9); EmitByte(0x05); EmitAdr(glob + op[i].b);
//fcomps nullfloat
EmitByte(0xd8); EmitByte(0x1d); EmitAdr(&nullfloat);
//fnstsw %ax
EmitByte(0xdf); EmitByte(0xe0);
//test $0x40,%ah
EmitByte(0xf6); EmitByte(0xc4);EmitByte(0x40);
//je onetrue
EmitByte(0x74); EmitByte(0x0c);
//mov float0,glob[C]
EmitByte(0xc7); EmitByte(0x05); EmitAdr(glob + op[i].c); EmitFloat(0.0f);
//jmp done
EmitByte(0xeb); EmitByte(0x0a);
//onetrue:
//mov float1,glob[C]
EmitByte(0xc7); EmitByte(0x05); EmitAdr(glob + op[i].c); EmitFloat(1.0f);
//done:
break;
case OP_EQ_S:
case OP_NE_S:
//put a in ecx
//put b in edi
//mov a,%ecx
EmitByte(0x8b); EmitByte(0x0d); EmitAdr(glob + op[i].a);
//mov b,%edi
EmitByte(0x8b); EmitByte(0x3d); EmitAdr(glob + op[i].b);
//early out if they're equal
//cmp %ecx,%edi
EmitByte(0x39); EmitByte(0xd1);
//je _true
EmitByte(0x74); EmitByte(0x68);
//if a is 0, check if b is ""
//jecxz ais0
EmitByte(0xe3); EmitByte(0x1a);
//if b is 0, check if a is ""
//cmp $0,%edi
EmitByte(0x83); EmitByte(0xff); EmitByte(0x00);
//jne bnot0
EmitByte(0x75); EmitByte(0x2a);
{
//push a
EmitByte(0x51);
//push progfuncs
EmitByte(0x68); EmitAdr(progfuncs);
//call PR_StringToNative
EmitByte(0xe8); EmitFOffset(PR_StringToNative,4);
//add $8,%esp
EmitByte(0x83); EmitByte(0xc4); EmitByte(0x08);
//cmpb $0,(%eax)
EmitByte(0x80); EmitByte(0x38); EmitByte(0x00);
//je _true
EmitByte(0x74); EmitByte(0x4b);
//jmp _false
EmitByte(0xeb); EmitByte(0x3d);
//ais0:
{
//push edi
EmitByte(0x57);
//push progfuncs
EmitByte(0x68); EmitAdr(progfuncs);
//call PR_StringToNative
EmitByte(0xe8); EmitFOffset(PR_StringToNative,4);
//add $8,%esp
EmitByte(0x83); EmitByte(0xc4); EmitByte(0x08);
//cmpb $0,(%eax)
EmitByte(0x80); EmitByte(0x38); EmitByte(0x00);
//je _true
EmitByte(0x74); EmitByte(0x36);
//jmp _false
EmitByte(0xeb); EmitByte(0x28);
}
}
//bnot0:
//push ecx
EmitByte(0x51);
//push progfuncs
EmitByte(0x68); EmitAdr(progfuncs);
//call PR_StringToNative
EmitByte(0xe8); EmitFOffset(PR_StringToNative,4);
//push %eax
EmitByte(0x50);
//push %edi
EmitByte(0x57);
//push progfuncs
EmitByte(0x68); EmitAdr(progfuncs);
//call PR_StringToNative
EmitByte(0xe8); EmitFOffset(PR_StringToNative,4);
//add $8,%esp
EmitByte(0x83); EmitByte(0xc4); EmitByte(0x08);
//push %eax
EmitByte(0x50);
//call strcmp
EmitByte(0xe8); EmitFOffset(strcmp,4);
//add $16,%esp
EmitByte(0x83); EmitByte(0xc4); EmitByte(0x10);
//cmp $0,%eax
EmitByte(0x83); EmitByte(0xf8); EmitByte(0x00);
//je _true
EmitByte(0x74); EmitByte(0x0c);
//_false:
//mov 0.0f,c
EmitByte(0xc7); EmitByte(0x05); EmitAdr(glob + op[i].c); EmitFloat((op[i].op == OP_NE_S)?1.0f:0.0f);
//jmp done
EmitByte(0xeb); EmitByte(0x0a);
//_true:
//mov 1.0f,c
EmitByte(0xc7); EmitByte(0x05); EmitAdr(glob + op[i].c); EmitFloat((op[i].op == OP_NE_S)?0.0f:1.0f);
//_done:
break;
case OP_NOT_S:
//mov A,%eax
EmitByte(0xa1);EmitAdr(glob + op[i].a);
//cmp $0,%eax
EmitByte(0x83); EmitByte(0xf8); EmitByte(0x00);
//je _true
EmitByte(0x74); EmitByte(0x1f);
//push %eax
EmitByte(0x50);
//push progfuncs
EmitByte(0x68); EmitAdr(progfuncs);
//call PR_StringToNative
EmitByte(0xe8); EmitFOffset(PR_StringToNative,4);
//add $8,%esp
EmitByte(0x83); EmitByte(0xc4); EmitByte(0x08);
//cmpb $0,(%eax)
EmitByte(0x80); EmitByte(0x38); EmitByte(0x00);
//je _true
EmitByte(0x74); EmitByte(0x0c);
//_false:
//mov 0.0f,c
EmitByte(0xc7); EmitByte(0x05); EmitAdr(glob + op[i].c); EmitFloat(0.0f);
//jmp done
EmitByte(0xeb); EmitByte(0x0a);
//_true:
//mov 1.0f,c
EmitByte(0xc7); EmitByte(0x05); EmitAdr(glob + op[i].c); EmitFloat(1.0f);
//_done:
break;
case OP_ADD_V:
//flds glob[A]
EmitByte(0xd9);EmitByte(0x05);EmitAdr(glob + op[i].a+0);
//fadds glob[B]
EmitByte(0xd8);EmitByte(0x05);EmitAdr(glob + op[i].b+0);
//fstps glob[C]
EmitByte(0xd9);EmitByte(0x1d);EmitAdr(glob + op[i].c+0);
//flds glob[A]
EmitByte(0xd9);EmitByte(0x05);EmitAdr(glob + op[i].a+1);
//fadds glob[B]
EmitByte(0xd8);EmitByte(0x05);EmitAdr(glob + op[i].b+1);
//fstps glob[C]
EmitByte(0xd9);EmitByte(0x1d);EmitAdr(glob + op[i].c+1);
//flds glob[A]
EmitByte(0xd9);EmitByte(0x05);EmitAdr(glob + op[i].a+2);
//fadds glob[B]
EmitByte(0xd8);EmitByte(0x05);EmitAdr(glob + op[i].b+2);
//fstps glob[C]
EmitByte(0xd9);EmitByte(0x1d);EmitAdr(glob + op[i].c+2);
break;
case OP_SUB_V:
//flds glob[A]
EmitByte(0xd9);EmitByte(0x05);EmitAdr(glob + op[i].a+0);
//fsubs glob[B]
EmitByte(0xd8);EmitByte(0x25);EmitAdr(glob + op[i].b+0);
//fstps glob[C]
EmitByte(0xd9);EmitByte(0x1d);EmitAdr(glob + op[i].c+0);
//flds glob[A]
EmitByte(0xd9);EmitByte(0x05);EmitAdr(glob + op[i].a+1);
//fsubs glob[B]
EmitByte(0xd8);EmitByte(0x25);EmitAdr(glob + op[i].b+1);
//fstps glob[C]
EmitByte(0xd9);EmitByte(0x1d);EmitAdr(glob + op[i].c+1);
//flds glob[A]
EmitByte(0xd9);EmitByte(0x05);EmitAdr(glob + op[i].a+2);
//fsubs glob[B]
EmitByte(0xd8);EmitByte(0x25);EmitAdr(glob + op[i].b+2);
//fstps glob[C]
EmitByte(0xd9);EmitByte(0x1d);EmitAdr(glob + op[i].c+2);
break;
case OP_MUL_V:
//this is actually a dotproduct
//flds glob[A]
EmitByte(0xd9);EmitByte(0x05);EmitAdr(glob + op[i].a+0);
//fmuls glob[B]
EmitByte(0xd8);EmitByte(0x0d);EmitAdr(glob + op[i].b+0);
//flds glob[A]
EmitByte(0xd9);EmitByte(0x05);EmitAdr(glob + op[i].a+1);
//fmuls glob[B]
EmitByte(0xd8);EmitByte(0x0d);EmitAdr(glob + op[i].b+1);
//flds glob[A]
EmitByte(0xd9);EmitByte(0x05);EmitAdr(glob + op[i].a+2);
//fmuls glob[B]
EmitByte(0xd8);EmitByte(0x0d);EmitAdr(glob + op[i].b+2);
//faddp
EmitByte(0xde);EmitByte(0xc1);
//faddp
EmitByte(0xde);EmitByte(0xc1);
//fstps glob[C]
EmitByte(0xd9);EmitByte(0x1d);EmitAdr(glob + op[i].c);
break;
case OP_EQ_F:
case OP_NE_F:
case OP_LE:
case OP_GE:
case OP_LT:
case OP_GT:
//flds glob[A]
EmitByte(0xd9);EmitByte(0x05);EmitAdr(glob + op[i].a);
//flds glob[B]
EmitByte(0xd9);EmitByte(0x05);EmitAdr(glob + op[i].b);
//fcomip %st(1),%st
EmitByte(0xdf);EmitByte(0xe9);
//fstp %st(0) (aka: pop)
EmitByte(0xdd);EmitByte(0xd8);
//jcc _true
if (op[i].op == OP_LE)
EmitByte(0x7e); //jle
else if (op[i].op == OP_GE)
EmitByte(0x7d); //jge
else if (op[i].op == OP_LT)
EmitByte(0x7c); //jl
else if (op[i].op == OP_GT)
EmitByte(0x7f); //jg
else if (op[i].op == OP_NE_F)
EmitByte(0x75); //jne
else
EmitByte(0x74); //je
EmitByte(0x0c);
//_false:
//mov 0.0f,c
EmitByte(0xc7); EmitByte(0x05); EmitAdr(glob + op[i].c); EmitFloat(0.0f);
//jmp done
EmitByte(0xeb); EmitByte(0x0a);
//_true:
//mov 1.0f,c
EmitByte(0xc7); EmitByte(0x05); EmitAdr(glob + op[i].c); EmitFloat(1.0f);
//_done:
break;
case OP_MUL_FV:
case OP_MUL_VF:
//
{
int v;
int f;
if (op[i].op == OP_MUL_FV)
{
f = op[i].a;
v = op[i].b;
}
else
{
v = op[i].a;
f = op[i].b;
}
//flds glob[F]
EmitByte(0xd9);EmitByte(0x05);EmitAdr(glob + f);
//flds glob[V0]
EmitByte(0xd8);EmitByte(0x0d);EmitAdr(glob + v+0);
//fmul st(1)
EmitByte(0xd8);EmitByte(0xc9);
//fstps glob[C]
EmitByte(0xd9);EmitByte(0x1d);EmitAdr(glob + op[i].c+0);
//flds glob[V0]
EmitByte(0xd8);EmitByte(0x0d);EmitAdr(glob + v+1);
//fmul st(1)
EmitByte(0xd8);EmitByte(0xc9);
//fstps glob[C]
EmitByte(0xd9);EmitByte(0x1d);EmitAdr(glob + op[i].c+1);
//flds glob[V0]
EmitByte(0xd8);EmitByte(0x0d);EmitAdr(glob + v+2);
//fmul st(1)
EmitByte(0xd8);EmitByte(0xc9);
//fstps glob[C]
EmitByte(0xd9);EmitByte(0x1d);EmitAdr(glob + op[i].c+2);
//fstp %st(0) (aka: pop)
EmitByte(0xdd);EmitByte(0xd8);
}
break;
case OP_STATE:
//externs->stateop(progfuncs, OPA->_float, OPB->function);
//push b
EmitByte(0xff);EmitByte(0x35);EmitAdr(glob + op[i].b);
//push a
EmitByte(0xff);EmitByte(0x35);EmitAdr(glob + op[i].a);
//push $progfuncs
EmitByte(0x68); EmitAdr(progfuncs);
//call externs->stateop
EmitByte(0xe8); EmitFOffset(externs->stateop, 4);
//add $12,%esp
EmitByte(0x83); EmitByte(0xc4); EmitByte(0x0c);
break;
/*
case OP_EQ_V:
EmitByte(0xcd);EmitByte(op[i].op);
printf("QCJIT: instruction %i is not implemented\n", op[i].op);
break;
case OP_NE_V:
EmitByte(0xcd);EmitByte(op[i].op);
printf("QCJIT: instruction %i is not implemented\n", op[i].op);
break;
case OP_NOT_V:
EmitByte(0xcd);EmitByte(op[i].op);
printf("QCJIT: instruction %i is not implemented\n", op[i].op);
break;
*/
default:
printf("QCJIT: Extended instruction set %i is not supported, not using jit.\n", op[i].op);
free(statementjumps); //[MAX_STATEMENTS]
free(statementoffsets); //[MAX_STATEMENTS]
free(code);
statementoffsets = NULL;
return false;
}
}
FixupJumps();
#ifdef _WIN32
{
DWORD old;
//this memory is on the heap.
//this means that we must maintain read/write protection, or libc will crash us
VirtualProtect(code, codesize, PAGE_EXECUTE_READWRITE, &old);
}
#endif
// externs->WriteFile("jit.x86", code, codesize);
return true;
}
void PR_EnterJIT(progfuncs_t *progfuncs, int statement)
{
#ifdef __GNUC__
//call, it clobbers pretty much everything.
asm("call %0" :: "r"(statementoffsets[statement+1]),"b"(prinst->edicttable):"cc","memory","eax","ecx","edx");
#elif defined(_MSC_VER)
void *entry = statementoffsets[statement+1];
void *edicttable = prinst->edicttable;
__asm {
pushad
mov eax,entry
mov ebx,edicttable
call eax
popad
}
#else
#error "Sorry, no idea how to enter assembler safely for your compiler"
#endif
}
#endif
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