[clang] [clang][bytecode] Move Pointer::{Prev, Next} into BlockPointer (PR #151097)
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cfe-commits at lists.llvm.org
Tue Jul 29 00:46:45 PDT 2025
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-clang
Author: Timm Baeder (tbaederr)
<details>
<summary>Changes</summary>
They are only relevant for block pointers.
---
Full diff: https://github.com/llvm/llvm-project/pull/151097.diff
6 Files Affected:
- (modified) clang/lib/AST/ByteCode/Disasm.cpp (+1-1)
- (modified) clang/lib/AST/ByteCode/DynamicAllocator.cpp (+1-1)
- (modified) clang/lib/AST/ByteCode/InterpBlock.cpp (+25-18)
- (modified) clang/lib/AST/ByteCode/InterpState.cpp (+1-1)
- (modified) clang/lib/AST/ByteCode/Pointer.cpp (+1-3)
- (modified) clang/lib/AST/ByteCode/Pointer.h (+5-6)
``````````diff
diff --git a/clang/lib/AST/ByteCode/Disasm.cpp b/clang/lib/AST/ByteCode/Disasm.cpp
index 74399d177b5a2..5049a6545eef6 100644
--- a/clang/lib/AST/ByteCode/Disasm.cpp
+++ b/clang/lib/AST/ByteCode/Disasm.cpp
@@ -531,7 +531,7 @@ LLVM_DUMP_METHOD void Block::dump(llvm::raw_ostream &OS) const {
Desc->dump(OS);
OS << ")\n";
unsigned NPointers = 0;
- for (const Pointer *P = Pointers; P; P = P->Next) {
+ for (const Pointer *P = Pointers; P; P = P->asBlockPointer().Next) {
++NPointers;
}
OS << " EvalID: " << EvalID << '\n';
diff --git a/clang/lib/AST/ByteCode/DynamicAllocator.cpp b/clang/lib/AST/ByteCode/DynamicAllocator.cpp
index 4f0f511fb6164..169250ce05fa7 100644
--- a/clang/lib/AST/ByteCode/DynamicAllocator.cpp
+++ b/clang/lib/AST/ByteCode/DynamicAllocator.cpp
@@ -27,7 +27,7 @@ void DynamicAllocator::cleanup() {
B->invokeDtor();
if (B->hasPointers()) {
while (B->Pointers) {
- Pointer *Next = B->Pointers->Next;
+ Pointer *Next = B->Pointers->asBlockPointer().Next;
B->Pointers->PointeeStorage.BS.Pointee = nullptr;
B->Pointers = Next;
}
diff --git a/clang/lib/AST/ByteCode/InterpBlock.cpp b/clang/lib/AST/ByteCode/InterpBlock.cpp
index f60307870ffcc..963b54ec50cff 100644
--- a/clang/lib/AST/ByteCode/InterpBlock.cpp
+++ b/clang/lib/AST/ByteCode/InterpBlock.cpp
@@ -27,9 +27,9 @@ void Block::addPointer(Pointer *P) {
assert(!hasPointer(P));
#endif
if (Pointers)
- Pointers->Prev = P;
- P->Next = Pointers;
- P->Prev = nullptr;
+ Pointers->PointeeStorage.BS.Prev = P;
+ P->PointeeStorage.BS.Next = Pointers;
+ P->PointeeStorage.BS.Prev = nullptr;
Pointers = P;
#ifndef NDEBUG
assert(hasPointer(P));
@@ -48,13 +48,15 @@ void Block::removePointer(Pointer *P) {
assert(hasPointer(P));
#endif
+ BlockPointer &BP = P->PointeeStorage.BS;
+
if (Pointers == P)
- Pointers = P->Next;
+ Pointers = BP.Next;
- if (P->Prev)
- P->Prev->Next = P->Next;
- if (P->Next)
- P->Next->Prev = P->Prev;
+ if (BP.Prev)
+ BP.Prev->PointeeStorage.BS.Next = BP.Next;
+ if (BP.Next)
+ BP.Next->PointeeStorage.BS.Prev = BP.Prev;
P->PointeeStorage.BS.Pointee = nullptr;
#ifndef NDEBUG
assert(!hasPointer(P));
@@ -68,7 +70,9 @@ void Block::cleanup() {
void Block::replacePointer(Pointer *Old, Pointer *New) {
assert(Old);
+ assert(Old->isBlockPointer());
assert(New);
+ assert(New->isBlockPointer());
assert(Old != New);
if (IsStatic) {
assert(!Pointers);
@@ -78,17 +82,20 @@ void Block::replacePointer(Pointer *Old, Pointer *New) {
assert(hasPointer(Old));
#endif
- if (Old->Prev)
- Old->Prev->Next = New;
- if (Old->Next)
- Old->Next->Prev = New;
- New->Prev = Old->Prev;
- New->Next = Old->Next;
+ BlockPointer &OldBP = Old->PointeeStorage.BS;
+ BlockPointer &NewBP = New->PointeeStorage.BS;
+
+ if (OldBP.Prev)
+ OldBP.Prev->PointeeStorage.BS.Next = New;
+ if (OldBP.Next)
+ OldBP.Next->PointeeStorage.BS.Prev = New;
+ NewBP.Prev = OldBP.Prev;
+ NewBP.Next = OldBP.Next;
if (Pointers == Old)
Pointers = New;
- Old->PointeeStorage.BS.Pointee = nullptr;
- New->PointeeStorage.BS.Pointee = this;
+ OldBP.Pointee = nullptr;
+ NewBP.Pointee = this;
#ifndef NDEBUG
assert(!hasPointer(Old));
assert(hasPointer(New));
@@ -97,7 +104,7 @@ void Block::replacePointer(Pointer *Old, Pointer *New) {
#ifndef NDEBUG
bool Block::hasPointer(const Pointer *P) const {
- for (const Pointer *C = Pointers; C; C = C->Next) {
+ for (const Pointer *C = Pointers; C; C = C->asBlockPointer().Next) {
if (C == P)
return true;
}
@@ -120,7 +127,7 @@ DeadBlock::DeadBlock(DeadBlock *&Root, Block *Blk)
// Transfer pointers.
B.Pointers = Blk->Pointers;
- for (Pointer *P = Blk->Pointers; P; P = P->Next)
+ for (Pointer *P = Blk->Pointers; P; P = P->asBlockPointer().Next)
P->PointeeStorage.BS.Pointee = &B;
Blk->Pointers = nullptr;
}
diff --git a/clang/lib/AST/ByteCode/InterpState.cpp b/clang/lib/AST/ByteCode/InterpState.cpp
index 7848f298cfec8..30108475d7db0 100644
--- a/clang/lib/AST/ByteCode/InterpState.cpp
+++ b/clang/lib/AST/ByteCode/InterpState.cpp
@@ -52,7 +52,7 @@ void InterpState::cleanup() {
// As a last resort, make sure all pointers still pointing to a dead block
// don't point to it anymore.
for (DeadBlock *DB = DeadBlocks; DB; DB = DB->Next) {
- for (Pointer *P = DB->B.Pointers; P; P = P->Next) {
+ for (Pointer *P = DB->B.Pointers; P; P = P->asBlockPointer().Next) {
P->PointeeStorage.BS.Pointee = nullptr;
}
}
diff --git a/clang/lib/AST/ByteCode/Pointer.cpp b/clang/lib/AST/ByteCode/Pointer.cpp
index 4019b74669282..cf8447c5a0b3d 100644
--- a/clang/lib/AST/ByteCode/Pointer.cpp
+++ b/clang/lib/AST/ByteCode/Pointer.cpp
@@ -41,7 +41,7 @@ Pointer::Pointer(Block *Pointee, unsigned Base, uint64_t Offset)
: Offset(Offset), StorageKind(Storage::Block) {
assert((Base == RootPtrMark || Base % alignof(void *) == 0) && "wrong base");
- PointeeStorage.BS = {Pointee, Base};
+ PointeeStorage.BS = {Pointee, Base, nullptr, nullptr};
if (Pointee)
Pointee->addPointer(this);
@@ -88,7 +88,6 @@ void Pointer::operator=(const Pointer &P) {
if (P.isBlockPointer()) {
PointeeStorage.BS = P.PointeeStorage.BS;
- PointeeStorage.BS.Pointee = P.PointeeStorage.BS.Pointee;
if (PointeeStorage.BS.Pointee)
PointeeStorage.BS.Pointee->addPointer(this);
@@ -125,7 +124,6 @@ void Pointer::operator=(Pointer &&P) {
if (P.isBlockPointer()) {
PointeeStorage.BS = P.PointeeStorage.BS;
- PointeeStorage.BS.Pointee = P.PointeeStorage.BS.Pointee;
if (PointeeStorage.BS.Pointee)
PointeeStorage.BS.Pointee->addPointer(this);
diff --git a/clang/lib/AST/ByteCode/Pointer.h b/clang/lib/AST/ByteCode/Pointer.h
index d17eba5da9ca6..4ec0799d3c33e 100644
--- a/clang/lib/AST/ByteCode/Pointer.h
+++ b/clang/lib/AST/ByteCode/Pointer.h
@@ -39,6 +39,10 @@ struct BlockPointer {
Block *Pointee;
/// Start of the current subfield.
unsigned Base;
+ /// Previous link in the pointer chain.
+ Pointer *Prev;
+ /// Next link in the pointer chain.
+ Pointer *Next;
};
struct IntPointer {
@@ -828,15 +832,10 @@ class Pointer {
/// Offset into the storage.
uint64_t Offset = 0;
- /// Previous link in the pointer chain.
- Pointer *Prev = nullptr;
- /// Next link in the pointer chain.
- Pointer *Next = nullptr;
-
Storage StorageKind = Storage::Int;
union {
- BlockPointer BS;
IntPointer Int;
+ BlockPointer BS;
FunctionPointer Fn;
TypeidPointer Typeid;
} PointeeStorage;
``````````
</details>
https://github.com/llvm/llvm-project/pull/151097
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