OrdinaryMagician/vkdoom_m
OrdinaryMagician/vkdoom_m
1
Fork 0
Code Activity

Static virtualscope checking. This is possible, because virtualscope can't produce false positives (data readable for everyone), only false negatives (which are handled at runtime later)

Browse source
This commit is contained in:
ZZYZX 2017-02-18 04:07:12 +02:00
commit b5ab011bb9
11 changed files with 59 additions and 22 deletions
Download patch file Download diff file Expand all files Collapse all files

41
src/scripting/zscript/zcc_compile.cpp
View file

@ -1273,7 +1273,7 @@ bool ZCCCompiler::CompileProperties(PClass *type, TArray<ZCC_Property *> &Proper
FString ZCCCompiler::FlagsToString(uint32_t flags)
{
const char *flagnames[] = { "native", "static", "private", "protected", "latent", "final", "meta", "action", "deprecated", "readonly", "const", "abstract", "extend", "virtual", "override", "transient", "vararg", "nonew", "ui", "play", "clearscope" };
const char *flagnames[] = { "native", "static", "private", "protected", "latent", "final", "meta", "action", "deprecated", "readonly", "const", "abstract", "extend", "virtual", "override", "transient", "vararg", "nonew", "ui", "play", "clearscope", "virtualscope" };
FString build;
for (size_t i = 0; i < countof(flagnames); i++)
@ -2130,11 +2130,13 @@ void ZCCCompiler::CompileFunction(ZCC_StructWork *c, ZCC_FuncDeclarator *f, bool
if (f->Flags & ZCC_FuncConst)
varflags = (varflags&~(VARF_Play | VARF_UI)); // const implies clearscope. this is checked a bit later to also not have ZCC_Play/ZCC_UIFlag.
if (f->Flags & ZCC_UIFlag)
varflags = (varflags&~VARF_Play) | VARF_UI;
varflags = FScopeBarrier::ChangeSideInFlags(varflags, FScopeBarrier::Side_UI);
if (f->Flags & ZCC_Play)
varflags = (varflags&~VARF_UI) | VARF_Play;
varflags = FScopeBarrier::ChangeSideInFlags(varflags, FScopeBarrier::Side_Play);
if (f->Flags & ZCC_ClearScope)
varflags = (varflags&~(VARF_Play | VARF_UI));
varflags = FScopeBarrier::ChangeSideInFlags(varflags, FScopeBarrier::Side_PlainData);
if (f->Flags & ZCC_VirtualScope)
varflags = FScopeBarrier::ChangeSideInFlags(varflags, FScopeBarrier::Side_Virtual);
// [ZZ] supporting const self for actors is quite a cumbersome task because there's no concept of a const pointer (?)
// either way, it doesn't make sense, because you can call any method on a readonly class instance.
@ -2194,14 +2196,20 @@ void ZCCCompiler::CompileFunction(ZCC_StructWork *c, ZCC_FuncDeclarator *f, bool
Error(f, "'Const' on a static method is not supported");
}
// you can't have a const function belonging to either ui or play.
// const is intended for plain data to signify that you can call a method on readonly variable.
if ((f->Flags & ZCC_FuncConst) && (f->Flags & (ZCC_UIFlag | ZCC_Play)))
// [ZZ] neither this
if ((varflags&(VARF_VirtualScope | VARF_Method)) == VARF_VirtualScope) // non-method virtualscope function
{
Error(f, "Invalid combination of qualifiers %s on function %s", FlagsToString(f->Flags&(ZCC_FuncConst | ZCC_UIFlag | ZCC_Play)).GetChars(), FName(f->Name).GetChars());
Error(f, "'VirtualScope' on a static method is not supported");
}
static int excludescope[] = { ZCC_UIFlag, ZCC_Play, ZCC_ClearScope };
// you can't have a const function belonging to either ui or play.
// const is intended for plain data to signify that you can call a method on readonly variable.
if ((f->Flags & ZCC_FuncConst) && (f->Flags & (ZCC_UIFlag | ZCC_Play | ZCC_VirtualScope)))
{
Error(f, "Invalid combination of qualifiers %s on function %s", FlagsToString(f->Flags&(ZCC_FuncConst | ZCC_UIFlag | ZCC_Play | ZCC_VirtualScope)).GetChars(), FName(f->Name).GetChars());
}
static int excludescope[] = { ZCC_UIFlag, ZCC_Play, ZCC_ClearScope, ZCC_VirtualScope };
excludeflags = 0;
fc = 0;
for (int i = 0; i < countof(excludescope); i++)
@ -2406,9 +2414,11 @@ void ZCCCompiler::CompileFunction(ZCC_StructWork *c, ZCC_FuncDeclarator *f, bool
sym->Variants[0].Implementation->Final = true;
// [ZZ] unspecified virtual function inherits old scope. virtual function scope can't be changed.
if (varflags & VARF_UI)
sym->Variants[0].Implementation->ScopeUI = true;
sym->Variants[0].Implementation->BarrierSide = FScopeBarrier::Side_UI;
if (varflags & VARF_Play)
sym->Variants[0].Implementation->ScopePlay = true;
sym->Variants[0].Implementation->BarrierSide = FScopeBarrier::Side_Play;
if (varflags & VARF_VirtualScope)
sym->Variants[0].Implementation->BarrierSide = FScopeBarrier::Side_Virtual;
if (varflags & VARF_ReadOnly)
sym->Variants[0].Implementation->FuncConst = true;
@ -2430,7 +2440,7 @@ void ZCCCompiler::CompileFunction(ZCC_StructWork *c, ZCC_FuncDeclarator *f, bool
Error(f, "Attempt to override final function %s", FName(f->Name).GetChars());
}
// you can't change ui/play/clearscope for a virtual method.
if (f->Flags & (ZCC_UIFlag|ZCC_Play|ZCC_ClearScope))
if (f->Flags & (ZCC_UIFlag|ZCC_Play|ZCC_ClearScope|ZCC_VirtualScope))
{
Error(f, "Attempt to change scope for virtual function %s", FName(f->Name).GetChars());
}
@ -2440,11 +2450,8 @@ void ZCCCompiler::CompileFunction(ZCC_StructWork *c, ZCC_FuncDeclarator *f, bool
Error(f, "Attempt to change const qualifier for virtual function %s", FName(f->Name).GetChars());
}
// inherit scope of original function if override not specified
if (sym->Variants[0].Implementation->ScopeUI = oldfunc->ScopeUI)
sym->Variants[0].Flags = (sym->Variants[0].Flags&~(VARF_Play)) | VARF_UI;
else if (sym->Variants[0].Implementation->ScopePlay = oldfunc->ScopePlay)
sym->Variants[0].Flags = (sym->Variants[0].Flags&~(VARF_UI)) | VARF_Play;
else sym->Variants[0].Flags = (sym->Variants[0].Flags&~(VARF_UI | VARF_Play));
sym->Variants[0].Implementation->BarrierSide = oldfunc->BarrierSide;
sym->Variants[0].Flags = FScopeBarrier::ChangeSideInFlags(sym->Variants[0].Flags, oldfunc->BarrierSide);
// inherit const from original function
if (sym->Variants[0].Implementation->FuncConst = oldfunc->FuncConst)
sym->Variants[0].Flags |= VARF_ReadOnly;