static TriggerPrg CodeRowTrigger(Parse parse, Trigger trigger, Table table, OE orconf)
{
Parse top = E.Parse_Toplevel(parse);
Context ctx = parse.Ctx; // Database handle
Debug.Assert(trigger.Name == null || table == TableOfTrigger(trigger));
Debug.Assert(top.V != null);
// Allocate the TriggerPrg and SubProgram objects. To ensure that they are freed if an error occurs, link them into the Parse.pTriggerPrg
// list of the top-level Parse object sooner rather than later.
TriggerPrg prg = new TriggerPrg(); // Value to return //: _tagalloc(ctx, sizeof(TriggerPrg), true);
if (prg == null)
{
return(null);
}
prg.Next = top.TriggerPrg;
top.TriggerPrg = prg;
Vdbe.SubProgram program; // Sub-vdbe for trigger program
prg.Program = program = new Vdbe.SubProgram(); // sqlite3DbMallocZero( db, sizeof( SubProgram ) );
if (program == null)
{
return(null);
}
top.V.LinkSubProgram(program);
prg.Trigger = trigger;
prg.Orconf = orconf;
prg.Colmasks[0] = 0xffffffff;
prg.Colmasks[1] = 0xffffffff;
// Allocate and populate a new Parse context to use for coding the trigger sub-program.
Parse subParse = new Parse(); // Parse context for sub-vdbe //: _stackalloc(ctx, sizeof(Parse), true);
if (subParse == null)
{
return(null);
}
NameContext sNC = new NameContext(); // Name context for sub-vdbe
sNC.Parse = subParse;
subParse.Ctx = ctx;
subParse.TriggerTab = table;
subParse.Toplevel = top;
subParse.AuthContext = trigger.Name;
subParse.TriggerOp = trigger.OP;
subParse.QueryLoops = parse.QueryLoops;
int endTrigger = 0; // Label to jump to if WHEN is false
Vdbe v = subParse.GetVdbe(); // Temporary VM
if (v != null)
{
#if DEBUG
v.Comment("Start: %s.%s (%s %s%s%s ON %s)",
trigger.Name, OnErrorText(orconf),
(trigger.TRtm == TRIGGER.BEFORE ? "BEFORE" : "AFTER"),
(trigger.OP == TK.UPDATE ? "UPDATE" : string.Empty),
(trigger.OP == TK.INSERT ? "INSERT" : string.Empty),
(trigger.OP == TK.DELETE ? "DELETE" : string.Empty),
table.Name);
#endif
#if !OMIT_TRACE
v.ChangeP4(-1, C._mtagprintf(ctx, "-- TRIGGER %s", trigger.Name), Vdbe.P4T.DYNAMIC);
#endif
// If one was specified, code the WHEN clause. If it evaluates to false (or NULL) the sub-vdbe is immediately halted by jumping to the
// OP_Halt inserted at the end of the program.
if (trigger.When != null)
{
Expr when = Expr.Dup(ctx, trigger.When, 0); // Duplicate of trigger WHEN expression
if (ResolveExprNames(sNC, ref when) == RC.OK && !ctx.MallocFailed)
{
endTrigger = v.MakeLabel();
subParse.IfFalse(when, endTrigger, RC_JUMPIFNULL);
}
Expr.Delete(ctx, ref when);
}
// Code the trigger program into the sub-vdbe.
CodeTriggerProgram(subParse, trigger.StepList, orconf);
// Insert an OP_Halt at the end of the sub-program.
if (endTrigger != 0)
{
v.ResolveLabel(endTrigger);
}
v.AddOp0(Core.OP.Halt);
#if DEBUG
v.Comment("End: %s.%s", trigger.Name, OnErrorText(orconf));
#endif
TransferParseError(parse, subParse);
if (!ctx.MallocFailed)
{
program.Ops.data = v.TakeOpArray(ref program.Ops.length, ref top.MaxArgs);
}
program.Mems = subParse.Mems;
program.Csrs = subParse.Tabs;
program.Token = trigger.GetHashCode();
prg.Colmasks[0] = subParse.Oldmask;
prg.Colmasks[1] = subParse.Newmask;
Vdbe.Delete(v);
}
Debug.Assert(subParse.Ainc == null && subParse.ZombieTab == null);
Debug.Assert(subParse.TriggerPrg == null && subParse.MaxArgs == 0);
C._stackfree(ctx, ref subParse);
return(prg);
}
static TriggerPrg CodeRowTrigger(Parse parse, Trigger trigger, Table table, OE orconf)
{
Parse top = E.Parse_Toplevel(parse);
Context ctx = parse.Ctx; // Database handle
Debug.Assert(trigger.Name == null || table == TableOfTrigger(trigger));
Debug.Assert(top.V != null);
// Allocate the TriggerPrg and SubProgram objects. To ensure that they are freed if an error occurs, link them into the Parse.pTriggerPrg
// list of the top-level Parse object sooner rather than later.
TriggerPrg prg = new TriggerPrg(); // Value to return //: _tagalloc(ctx, sizeof(TriggerPrg), true);
if (prg == null) return null;
prg.Next = top.TriggerPrg;
top.TriggerPrg = prg;
Vdbe.SubProgram program; // Sub-vdbe for trigger program
prg.Program = program = new Vdbe.SubProgram();// sqlite3DbMallocZero( db, sizeof( SubProgram ) );
if (program == null) return null;
top.V.LinkSubProgram(program);
prg.Trigger = trigger;
prg.Orconf = orconf;
prg.Colmasks[0] = 0xffffffff;
prg.Colmasks[1] = 0xffffffff;
// Allocate and populate a new Parse context to use for coding the trigger sub-program.
Parse subParse = new Parse(); // Parse context for sub-vdbe //: _stackalloc(ctx, sizeof(Parse), true);
if (subParse == null) return null;
NameContext sNC = new NameContext(); // Name context for sub-vdbe
sNC.Parse = subParse;
subParse.Ctx = ctx;
subParse.TriggerTab = table;
subParse.Toplevel = top;
subParse.AuthContext = trigger.Name;
subParse.TriggerOp = trigger.OP;
subParse.QueryLoops = parse.QueryLoops;
int endTrigger = 0; // Label to jump to if WHEN is false
Vdbe v = subParse.GetVdbe(); // Temporary VM
if (v != null)
{
#if DEBUG
v.Comment("Start: %s.%s (%s %s%s%s ON %s)",
trigger.Name, OnErrorText(orconf),
(trigger.TRtm == TRIGGER.BEFORE ? "BEFORE" : "AFTER"),
(trigger.OP == TK.UPDATE ? "UPDATE" : string.Empty),
(trigger.OP == TK.INSERT ? "INSERT" : string.Empty),
(trigger.OP == TK.DELETE ? "DELETE" : string.Empty),
table.Name);
#endif
#if !OMIT_TRACE
v.ChangeP4(-1, C._mtagprintf(ctx, "-- TRIGGER %s", trigger.Name), Vdbe.P4T.DYNAMIC);
#endif
// If one was specified, code the WHEN clause. If it evaluates to false (or NULL) the sub-vdbe is immediately halted by jumping to the
// OP_Halt inserted at the end of the program.
if (trigger.When != null)
{
Expr when = Expr.Dup(ctx, trigger.When, 0); // Duplicate of trigger WHEN expression
if (ResolveExprNames(sNC, ref when) == RC.OK && !ctx.MallocFailed)
{
endTrigger = v.MakeLabel();
subParse.IfFalse(when, endTrigger, RC_JUMPIFNULL);
}
Expr.Delete(ctx, ref when);
}
// Code the trigger program into the sub-vdbe.
CodeTriggerProgram(subParse, trigger.StepList, orconf);
// Insert an OP_Halt at the end of the sub-program.
if (endTrigger != 0)
v.ResolveLabel(endTrigger);
v.AddOp0(Core.OP.Halt);
#if DEBUG
v.Comment("End: %s.%s", trigger.Name, OnErrorText(orconf));
#endif
TransferParseError(parse, subParse);
if (!ctx.MallocFailed)
program.Ops.data = v.TakeOpArray(ref program.Ops.length, ref top.MaxArgs);
program.Mems = subParse.Mems;
program.Csrs = subParse.Tabs;
program.Token = trigger.GetHashCode();
prg.Colmasks[0] = subParse.Oldmask;
prg.Colmasks[1] = subParse.Newmask;
Vdbe.Delete(v);
}
Debug.Assert(subParse.Ainc == null && subParse.ZombieTab == null);
Debug.Assert(subParse.TriggerPrg == null && subParse.MaxArgs == 0);
C._stackfree(ctx, ref subParse);
return prg;
}
