[cfe-commits] r110286 - /cfe/trunk/lib/Analysis/CFG.cpp
Ted Kremenek
kremenek at apple.com
Wed Aug 4 16:54:30 PDT 2010
Author: kremenek
Date: Wed Aug 4 18:54:30 2010
New Revision: 110286
URL: http://llvm.org/viewvc/llvm-project?rev=110286&view=rev
Log:
Fix CFGBuilder to not blow out the stack when processing deeply nested CaseStmts. Fixes <rdar://problem/8268753>.
Modified:
cfe/trunk/lib/Analysis/CFG.cpp
Modified: cfe/trunk/lib/Analysis/CFG.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Analysis/CFG.cpp?rev=110286&r1=110285&r2=110286&view=diff
==============================================================================
--- cfe/trunk/lib/Analysis/CFG.cpp (original)
+++ cfe/trunk/lib/Analysis/CFG.cpp Wed Aug 4 18:54:30 2010
@@ -1617,9 +1617,30 @@
CFGBlock* CFGBuilder::VisitCaseStmt(CaseStmt* CS) {
// CaseStmts are essentially labels, so they are the first statement in a
// block.
+ CFGBlock *TopBlock = 0, *LastBlock = 0;
+
+ if (Stmt *Sub = CS->getSubStmt()) {
+ // For deeply nested chains of CaseStmts, instead of doing a recursion
+ // (which can blow out the stack), manually unroll and create blocks
+ // along the way.
+ while (isa<CaseStmt>(Sub)) {
+ CFGBlock *CurrentBlock = createBlock(false);
+ CurrentBlock->setLabel(CS);
- if (CS->getSubStmt())
- addStmt(CS->getSubStmt());
+ if (TopBlock)
+ AddSuccessor(LastBlock, CurrentBlock);
+ else
+ TopBlock = CurrentBlock;
+
+ AddSuccessor(SwitchTerminatedBlock, CurrentBlock);
+ LastBlock = CurrentBlock;
+
+ CS = cast<CaseStmt>(Sub);
+ Sub = CS->getSubStmt();
+ }
+
+ addStmt(Sub);
+ }
CFGBlock* CaseBlock = Block;
if (!CaseBlock)
@@ -1640,10 +1661,16 @@
// We set Block to NULL to allow lazy creation of a new block (if necessary)
Block = NULL;
- // This block is now the implicit successor of other blocks.
- Succ = CaseBlock;
+ if (TopBlock) {
+ AddSuccessor(LastBlock, CaseBlock);
+ Succ = TopBlock;
+ }
+ else {
+ // This block is now the implicit successor of other blocks.
+ Succ = CaseBlock;
+ }
- return CaseBlock;
+ return Succ;
}
CFGBlock* CFGBuilder::VisitDefaultStmt(DefaultStmt* Terminator) {
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