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#include "stdafx.h"
#include "TypeTransform.h"
#include "Variable.h"
#include "Type.h"
#include "Engine.h"
namespace storm {
TypeTransform::TypeTransform(Type *oldType, Type *newType)
: oldT(oldType), newT(newType) {}
void TypeTransform::added(MemberVar *var) {
grow();
variables->v[variables->filled].oldVar = null;
variables->v[variables->filled].newVar = var;
variables->v[variables->filled].cache = null;
variables->filled++;
}
void TypeTransform::removed(MemberVar *var) {
grow();
variables->v[variables->filled].oldVar = var;
variables->v[variables->filled].newVar = null;
variables->v[variables->filled].cache = null;
variables->filled++;
}
void TypeTransform::same(MemberVar *o, MemberVar *n) {
grow();
variables->v[variables->filled].oldVar = o;
variables->v[variables->filled].newVar = n;
variables->v[variables->filled].cache = null;
variables->filled++;
}
void TypeTransform::grow() {
const size_t scale = sizeof(MapItem) / sizeof(void *);
if (!variables) {
variables = runtime::allocArray<MapItem>(engine(), &pointerArrayType, 10 * scale);
return;
}
Nat oldSize = Nat(variables->count / scale);
if (variables->filled * 2 < oldSize)
return;
Nat newSize = Nat(variables->filled * 2);
GcArray<MapItem> *copy = runtime::allocArray<MapItem>(engine(), &pointerArrayType, newSize * scale);
memcpy(copy->v, variables->v, sizeof(MapItem) * oldSize);
copy->filled = variables->filled;
variables = copy;
}
RootObject *TypeTransform::apply(RootObject *old) {
assert(newT->isClass(), L"Only classes are supported currently.");
// TODO: We might want to generate code for parts of this. The cache makes it acceptable to
// do even without compiled code.
RootObject *copy = (RootObject *)runtime::allocObject(newT->size().current(), newT);
// Set VTable:
if (VTable *vtable = newT->vtable())
vtable->insert(copy);
// If it is a TObject, copy the thread. We don't expect that to be in the transforms.
if (newT->isA(StormInfo<TObject>::type(engine()))) {
size_t threadOffset = size_t(engine().ref(builtin::TObjectOffset).address());
void *oldThread = (byte *)old + threadOffset;
void *newThread = (byte *)copy + threadOffset;
*(void **)newThread = *(void **)oldThread;
}
// Copy remaining things according to what is in 'variables':
for (size_t i = 0; i < variables->filled; i++) {
MapItem &var = variables->v[i];
if (!var.newVar) {
// Skip removed variables.
} else if (!var.oldVar) {
// Initialize new variables.
initVar(copy, var.newVar, var.cache);
} else {
// Copy the rest.
copyVar(copy, var.newVar, old, var.oldVar, var.cache);
}
}
return copy;
}
void TypeTransform::initVar(RootObject *object, MemberVar *var, Function *&defaultCtor) {
void *dest = (byte *)object + var->rawOffset().current();
if (Function *init = var->initializer()) {
// Call the initializer.
os::CallThunk thunk = init->callThunk();
void *params[1] = { null };
(*thunk)(init->ref().address(), false, params, null, dest);
} else {
// Call the ctor. Cache the result to avoid multiple lookups.
if (!defaultCtor)
defaultCtor = var->type.type->defaultCtor();
if (defaultCtor) {
typedef void (*CtorFn)(void *);
CtorFn c = (CtorFn)defaultCtor->ref().address();
(*c)(dest);
}
}
}
void TypeTransform::copyVar(RootObject *to, MemberVar *toVar,
RootObject *from, MemberVar *fromVar,
Function *©Ctor) {
void *dest = (byte *)to + toVar->rawOffset().current();
void *src = (byte *)from + fromVar->rawOffset().current();
if (!toVar->type.isPrimitive()) {
if (!copyCtor)
copyCtor = toVar->type.type->copyCtor();
if (copyCtor) {
typedef void (*CtorCall)(void *, void *);
CtorCall copy = (CtorCall)copyCtor->ref().address();
(*copy)(dest, src);
return;
}
}
// Fall back to memcpy!
memcpy(dest, src, toVar->type.size().current());
}
TypeTransform::Summary TypeTransform::summary() const {
vector<Summary::Var> vars;
for (size_t i = 0; i < variables->filled; i++) {
const MapItem &var = variables->v[i];
// Skip variables that did not exist previously.
if (!var.oldVar)
continue;
Summary::Var v = {
size_t(var.oldVar->rawOffset().current()),
size_t(var.oldVar->type.size().current()),
0
};
// Note: Removed variables are intentionally mapped to zero. Might not be ideal, but
// currently we don't allow removing member variables, so it is fine.
if (var.newVar)
v.newStart = var.newVar->rawOffset().current();
vars.push_back(v);
}
return Summary(oldT->size().current(), vars);
}
TypeTransform::Summary::Summary(size_t size, const vector<Var> &vars)
: size(size), variables(vars) {
std::sort(variables.begin(), variables.end());
}
size_t TypeTransform::Summary::translate(size_t x) const {
vector<Var>::const_iterator found = std::lower_bound(variables.begin(), variables.end(), x);
if (found != variables.end() && found->start == x) {
// Use 'found' as it is.
} else if (found == variables.begin()) {
// No previous element, bail out. This should not happen.
return x;
} else {
// Use the previous element.
--found;
}
size_t varOffset = x - found->start;
// Inside the variable? If not, should not really happen...
if (varOffset > found->size)
return x;
return found->newStart + varOffset;
}
}
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