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FxVMFunctionCall must pass null pointers when calling an action function from a non-action function

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This commit is contained in:
Marisa Heit 2016-10-01 22:29:57 -05:00
parent 944ae2bc09
commit eb2ee33950
1 changed files with 17 additions and 6 deletions
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19
src/thingdef/thingdef_expression.cpp
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@ -3948,15 +3948,16 @@ FxExpression *FxVMFunctionCall::Resolve(FCompileContext& ctx)
//==========================================================================
//
// Assumption: This call is being made to generate code inside an action
// method, so the first three address registers are all set up for such a
// function. (self, stateowner, callingstate)
// Assumption: This call is being generated inside a function whose a0
// register is a self pointer. For action functions, a1 maps to stateowner
// and a2 maps to callingstate. (self, stateowner, callingstate)
//
//==========================================================================
ExpEmit FxVMFunctionCall::Emit(VMFunctionBuilder *build)
{
assert(build->Registers[REGT_POINTER].GetMostUsed() >= 3);
assert((build->IsActionFunc && build->Registers[REGT_POINTER].GetMostUsed() >= NAP) ||
(!build->IsActionFunc && build->Registers[REGT_POINTER].GetMostUsed() >= 1));
int count = (ArgList ? ArgList->Size() : 0);
if (count == 1)
@ -3974,9 +3975,19 @@ ExpEmit FxVMFunctionCall::Emit(VMFunctionBuilder *build)
count += 1;
}
if (Function->Flags & VARF_Action)
{
static_assert(NAP == 3, "This code needs to be updated if NAP changes");
if (build->IsActionFunc)
{
build->Emit(OP_PARAM, 0, REGT_POINTER, 1);
build->Emit(OP_PARAM, 0, REGT_POINTER, 2);
}
else
{
int null = build->GetConstantAddress(nullptr, ATAG_GENERIC);
build->Emit(OP_PARAM, 0, REGT_POINTER | REGT_KONST, null);
build->Emit(OP_PARAM, 0, REGT_POINTER | REGT_KONST, null);
}
count += 2;
}
// Emit code to pass explicit parameters