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Do a check if a local variable exceeds the available stack space.

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Windows stack is 1 MB so play it safe and allow 512 kb as max. stack space for a single function.
This commit is contained in:
Christoph Oelckers 2024-10-25 07:54:49 +02:00
parent 59dab44380
commit ee6991e6d8
1 changed files with 9 additions and 0 deletions
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9
src/common/scripting/backend/codegen.cpp
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@ -12640,6 +12640,15 @@ FxExpression *FxLocalVariableDeclaration::Resolve(FCompileContext &ctx)
if (ValueType->RegType == REGT_NIL && ValueType != TypeAuto) if (ValueType->RegType == REGT_NIL && ValueType != TypeAuto)
{ {
auto sfunc = static_cast<VMScriptFunction *>(ctx.Function->Variants[0].Implementation); auto sfunc = static_cast<VMScriptFunction *>(ctx.Function->Variants[0].Implementation);
const unsigned MAX_STACK_ALLOC = 512 * 1024; // Windows stack is 1 MB, but we cannot go up there without problems
if (uint64_t(ValueType->Size) + uint64_t(sfunc->ExtraSpace) > MAX_STACK_ALLOC)
{
ScriptPosition.Message(MSG_ERROR, "%s exceeds max. allowed size of 512kb for local variables at variable %s", sfunc->Name.GetChars(), Name.GetChars());
delete this;
return nullptr;
}
StackOffset = sfunc->AllocExtraStack(ValueType); StackOffset = sfunc->AllocExtraStack(ValueType);
if (Init != nullptr) if (Init != nullptr)