Implement support for the unwind intrinsic in the CBE
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8116 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/CBackend/CBackend.cpp b/lib/Target/CBackend/CBackend.cpp
index 4bc354b..7f2b14d 100644
--- a/lib/Target/CBackend/CBackend.cpp
+++ b/lib/Target/CBackend/CBackend.cpp
@@ -1137,6 +1137,19 @@
writeOperand(I.getOperand(2));
Out << ")";
return;
+
+ case LLVMIntrinsic::unwind:
+ // The unwind intrinsic calls 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)";
+ return;
+
case LLVMIntrinsic::setjmp:
case LLVMIntrinsic::sigsetjmp:
diff --git a/lib/Target/CBackend/Writer.cpp b/lib/Target/CBackend/Writer.cpp
index 4bc354b..7f2b14d 100644
--- a/lib/Target/CBackend/Writer.cpp
+++ b/lib/Target/CBackend/Writer.cpp
@@ -1137,6 +1137,19 @@
writeOperand(I.getOperand(2));
Out << ")";
return;
+
+ case LLVMIntrinsic::unwind:
+ // The unwind intrinsic calls 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)";
+ return;
+
case LLVMIntrinsic::setjmp:
case LLVMIntrinsic::sigsetjmp: