[llvm-commits] CVS: llvm/lib/CWriter/Writer.cpp

[Chris Lattner]

Changes in directory llvm/lib/CWriter:

Writer.cpp updated: 1.120 -> 1.121

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Log message:

Add support for the unwind instruction


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Diffs of the changes:

Index: llvm/lib/CWriter/Writer.cpp
diff -u llvm/lib/CWriter/Writer.cpp:1.120 llvm/lib/CWriter/Writer.cpp:1.121
--- llvm/lib/CWriter/Writer.cpp:1.120	Thu Aug 28 14:56:10 2003
+++ llvm/lib/CWriter/Writer.cpp	Mon Sep  8 13:54:50 2003
@@ -117,6 +117,7 @@
     void visitBranchInst(BranchInst &I);
     void visitSwitchInst(SwitchInst &I);
     void visitInvokeInst(InvokeInst &I);
+    void visitUnwindInst(UnwindInst &I);
 
     void visitPHINode(PHINode &I);
     void visitBinaryOperator(Instruction &I);
@@ -979,6 +980,19 @@
   emittedInvoke = true;
 }
 
+
+void CWriter::visitUnwindInst(UnwindInst &I) {
+  // The unwind instructions causes a control flow transfer out of the current
+  // function, unwinding the stack until a caller who used the invoke
+  // instruction is found.  In this context, we code generated the invoke
+  // instruction to add an entry to the top of the jmpbuf_list.  Thus, here we
+  // just have to longjmp to the specified handler.
+  Out << "  if (__llvm_jmpbuf_list == 0) {  /* llvm.unwind */\n"
+      << "    printf(\"throw found with no handler!\\n\"); abort();\n"
+      << "  }\n"
+      << "  longjmp(__llvm_jmpbuf_list->buf, 1);\n";
+  emittedInvoke = true;
+}
 
 static bool isGotoCodeNeccessary(BasicBlock *From, BasicBlock *To) {
   // If PHI nodes need copies, we need the copy code...