aboutsummaryrefslogtreecommitdiffstats
path: root/lib/AST/Interp/Block.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'lib/AST/Interp/Block.cpp')
-rw-r--r--lib/AST/Interp/Block.cpp87
1 files changed, 87 insertions, 0 deletions
diff --git a/lib/AST/Interp/Block.cpp b/lib/AST/Interp/Block.cpp
new file mode 100644
index 000000000000..5fc93eb39f4e
--- /dev/null
+++ b/lib/AST/Interp/Block.cpp
@@ -0,0 +1,87 @@
+//===--- Block.cpp - Allocated blocks for the interpreter -------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// Defines the classes describing allocated blocks.
+//
+//===----------------------------------------------------------------------===//
+
+#include "Block.h"
+#include "Pointer.h"
+
+using namespace clang;
+using namespace clang::interp;
+
+
+
+void Block::addPointer(Pointer *P) {
+ if (IsStatic)
+ return;
+ if (Pointers)
+ Pointers->Prev = P;
+ P->Next = Pointers;
+ P->Prev = nullptr;
+ Pointers = P;
+}
+
+void Block::removePointer(Pointer *P) {
+ if (IsStatic)
+ return;
+ if (Pointers == P)
+ Pointers = P->Next;
+ if (P->Prev)
+ P->Prev->Next = P->Next;
+ if (P->Next)
+ P->Next->Prev = P->Prev;
+}
+
+void Block::cleanup() {
+ if (Pointers == nullptr && IsDead)
+ (reinterpret_cast<DeadBlock *>(this + 1) - 1)->free();
+}
+
+void Block::movePointer(Pointer *From, Pointer *To) {
+ if (IsStatic)
+ return;
+ To->Prev = From->Prev;
+ if (To->Prev)
+ To->Prev->Next = To;
+ To->Next = From->Next;
+ if (To->Next)
+ To->Next->Prev = To;
+ if (Pointers == From)
+ Pointers = To;
+
+ From->Prev = nullptr;
+ From->Next = nullptr;
+}
+
+DeadBlock::DeadBlock(DeadBlock *&Root, Block *Blk)
+ : Root(Root), B(Blk->Desc, Blk->IsStatic, Blk->IsExtern, /*isDead=*/true) {
+ // Add the block to the chain of dead blocks.
+ if (Root)
+ Root->Prev = this;
+
+ Next = Root;
+ Prev = nullptr;
+ Root = this;
+
+ // Transfer pointers.
+ B.Pointers = Blk->Pointers;
+ for (Pointer *P = Blk->Pointers; P; P = P->Next)
+ P->Pointee = &B;
+}
+
+void DeadBlock::free() {
+ if (Prev)
+ Prev->Next = Next;
+ if (Next)
+ Next->Prev = Prev;
+ if (Root == this)
+ Root = Next;
+ ::free(this);
+}