Handle variable arguments for ARM/Mips/X86.
Expand va_arg LLVM instruction in a target-specific manner.
Change-Id: Iddf071b7f4026f003df2ad129fd940c506e9ec99
diff --git a/lib/AndroidBitcode/ABCExpandVAArgPass.cpp b/lib/AndroidBitcode/ABCExpandVAArgPass.cpp
new file mode 100644
index 0000000..7b89ced
--- /dev/null
+++ b/lib/AndroidBitcode/ABCExpandVAArgPass.cpp
@@ -0,0 +1,50 @@
+/*
+ * Copyright 2012, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef BCC_ABC_EXPAND_VAARG_H
+#define BCC_ABC_EXPAND_VAARG_H
+
+#include "bcc/AndroidBitcode/ABCExpandVAArgPass.h"
+
+#include <llvm/Instructions.h>
+#include <llvm/Support/InstIterator.h>
+
+namespace bcc {
+
+char ABCExpandVAArgPass::ID = 0;
+
+bool ABCExpandVAArgPass::runOnFunction(llvm::Function &pFunc) {
+ bool changed = false;
+
+ mContext = &pFunc.getContext();
+
+ // process va_arg inst
+ for (llvm::inst_iterator inst = llvm::inst_begin(pFunc),
+ inst_end = llvm::inst_end(pFunc); inst != inst_end; inst++) {
+ if (inst->getOpcode() == llvm::Instruction::VAArg) {
+ llvm::Value *v = expandVAArg(&*inst);
+ inst->replaceAllUsesWith(v);
+ inst->eraseFromParent();
+ changed = true;
+ continue;
+ }
+ }
+ return changed;
+}
+
+} // end bcc namespace
+
+#endif // BCC_ABC_EXPAND_VAARG_H