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Nested static functions and function literals do not inherit the parent context

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This commit is contained in:
Martin 2015-10-08 00:25:04 +02:00
parent cda8a12112
commit a2fe91d5e3
2 changed files with 64 additions and 51 deletions
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102
gen/nested.cpp
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@ -322,15 +322,28 @@ LLValue* DtoNestedContext(Loc& loc, Dsymbol* sym)
return val;
}
static void DtoCreateNestedContextType(FuncDeclaration* fd) {
static void DtoCreateNestedContextType(FuncDeclaration* fd)
{
IF_LOG Logger::println("DtoCreateNestedContextType for %s", fd->toPrettyChars());
LOG_SCOPE
DtoDeclareFunction(fd);
if (getIrFunc(fd)->nestedContextCreated)
IrFunction& irFunc = *getIrFunc(fd);
if (irFunc.nestedContextCreated)
return;
getIrFunc(fd)->nestedContextCreated = true;
irFunc.nestedContextCreated = true;
// Static functions and function (not delegate) literals don't allow
// access to a parent context, even if they are nested.
const bool certainlyNewRoot = fd->isStatic() ||
(fd->isFuncLiteralDeclaration() &&
static_cast<FuncLiteralDeclaration*>(fd)->tok == TOKfunction);
FuncDeclaration* parentFunc = (certainlyNewRoot ? NULL : getParentFunc(fd, true));
// Make sure the parent has already been analyzed.
if (parentFunc)
DtoCreateNestedContextType(parentFunc);
// construct nested variables array
if (fd->closureVars.dim > 0)
@ -339,42 +352,34 @@ static void DtoCreateNestedContextType(FuncDeclaration* fd) {
// start with adding all enclosing parent frames until a static parent is reached
LLStructType* innerFrameType = NULL;
unsigned depth = -1;
int depth = 0;
// Static functions and function (not delegate) literals don't allow
// access to a parent context, even if they are nested.
const bool certainlyNewRoot = fd->isStatic() ||
(fd->isFuncLiteralDeclaration() &&
static_cast<FuncLiteralDeclaration*>(fd)->tok == TOKfunction);
if (!certainlyNewRoot) {
if (FuncDeclaration* parfd = getParentFunc(fd, true)) {
// Make sure the parent has already been analyzed.
DtoCreateNestedContextType(parfd);
innerFrameType = getIrFunc(parfd)->frameType;
if (innerFrameType)
depth = getIrFunc(parfd)->depth;
}
if (parentFunc)
{
IrFunction& parentIrFunc = *getIrFunc(parentFunc);
innerFrameType = parentIrFunc.frameType;
if (innerFrameType)
depth = parentIrFunc.depth + 1;
}
getIrFunc(fd)->depth = ++depth;
irFunc.depth = depth;
IF_LOG Logger::cout() << "Function " << fd->toChars() << " has depth " << depth << '\n';
typedef std::vector<LLType*> TypeVec;
TypeVec types;
if (depth != 0) {
if (depth != 0)
{
assert(innerFrameType);
// Add frame pointer types for all but last frame
if (depth > 1) {
for (unsigned i = 0; i < (depth - 1); ++i) {
types.push_back(innerFrameType->getElementType(i));
}
}
for (unsigned i = 0; i < (depth - 1); ++i)
types.push_back(innerFrameType->getElementType(i));
// Add frame pointer type for last frame
types.push_back(LLPointerType::getUnqual(innerFrameType));
}
if (Logger::enabled() && depth != 0) {
if (Logger::enabled() && depth != 0)
{
Logger::println("Frame types: ");
LOG_SCOPE;
for (TypeVec::iterator i = types.begin(); i != types.end(); ++i)
@ -385,13 +390,15 @@ static void DtoCreateNestedContextType(FuncDeclaration* fd) {
// TODO: optimize ordering for minimal space usage?
for (VarDeclarations::iterator I = fd->closureVars.begin(),
E = fd->closureVars.end();
I != E; ++I) {
I != E; ++I)
{
VarDeclaration* vd = *I;
IrLocal *irLocal = getIrLocal(vd, true);
irLocal->nestedIndex = types.size();
irLocal->nestedDepth = depth;
IrLocal& irLocal = *getIrLocal(vd, true);
irLocal.nestedIndex = types.size();
irLocal.nestedDepth = depth;
if (vd->isParameter() && getIrParameter(vd)->arg) {
if (vd->isParameter() && getIrParameter(vd)->arg)
{
// Parameters that are part of the LLVM signature will have
// storage associated with them (to handle byref etc.), so
// handle those cases specially by storing a pointer instead
@ -401,20 +408,22 @@ static void DtoCreateNestedContextType(FuncDeclaration* fd) {
const bool lazy = vd->storage_class & STClazy;
const bool byref = irparam->arg->byref;
const bool isVthisPtr = irparam->isVthis && !byref;
if (!(refout || (byref && !lazy)) || isVthisPtr) {
if (!(refout || (byref && !lazy)) || isVthisPtr)
{
// This will be copied to the nesting frame.
if (lazy)
types.push_back(irparam->value->getType()->getContainedType(0));
else
types.push_back(DtoMemType(vd->type));
} else {
types.push_back(irparam->value->getType());
}
} else if (isSpecialRefVar(vd)) {
types.push_back(DtoType(vd->type->pointerTo()));
} else {
types.push_back(DtoMemType(vd->type));
else
types.push_back(irparam->value->getType());
}
else if (isSpecialRefVar(vd))
types.push_back(DtoType(vd->type->pointerTo()));
else
types.push_back(DtoMemType(vd->type));
IF_LOG Logger::cout() << "Nested var '" << vd->toChars()
<< "' of type " << *types.back() << "\n";
}
@ -425,12 +434,17 @@ static void DtoCreateNestedContextType(FuncDeclaration* fd) {
IF_LOG Logger::cout() << "frameType = " << *frameType << '\n';
// Store type in IrFunction
getIrFunc(fd)->frameType = frameType;
} else if (FuncDeclaration* parFunc = getParentFunc(fd, true)) {
// Propagate context arg properties if the context arg is passed on unmodified.
DtoCreateNestedContextType(parFunc);
getIrFunc(fd)->frameType = getIrFunc(parFunc)->frameType;
getIrFunc(fd)->depth = getIrFunc(parFunc)->depth;
irFunc.frameType = frameType;
}
else // no captured variables
{
if (parentFunc)
{
// Propagate context arg properties if the context arg is passed on unmodified.
IrFunction& parentIrFunc = *getIrFunc(parentFunc);
irFunc.frameType = parentIrFunc.frameType;
irFunc.depth = parentIrFunc.depth;
}
}
}