From 3fa50f9b0529f046c27a0a9d7f93732138638a6c Mon Sep 17 00:00:00 2001
From: Peter Collingbourne <peter@pcc.me.uk>
Date: Mon, 16 Sep 2013 01:08:15 +0000
Subject: Implement function prefix data as an IR feature.

Previous discussion:
http://lists.cs.uiuc.edu/pipermail/llvmdev/2013-July/063909.html

Differential Revision: http://llvm-reviews.chandlerc.com/D1191

llvm-svn: 190773
---
 llvm/lib/Bitcode/Reader/BitcodeReader.cpp | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

(limited to 'llvm/lib/Bitcode/Reader/BitcodeReader.cpp')

diff --git a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
index ca432fd..0c20163 100644
--- a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
+++ b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
@@ -1106,9 +1106,11 @@ uint64_t BitcodeReader::decodeSignRotatedValue(uint64_t V) {
 bool BitcodeReader::ResolveGlobalAndAliasInits() {
   std::vector<std::pair<GlobalVariable*, unsigned> > GlobalInitWorklist;
   std::vector<std::pair<GlobalAlias*, unsigned> > AliasInitWorklist;
+  std::vector<std::pair<Function*, unsigned> > FunctionPrefixWorklist;
 
   GlobalInitWorklist.swap(GlobalInits);
   AliasInitWorklist.swap(AliasInits);
+  FunctionPrefixWorklist.swap(FunctionPrefixes);
 
   while (!GlobalInitWorklist.empty()) {
     unsigned ValID = GlobalInitWorklist.back().second;
@@ -1136,6 +1138,20 @@ bool BitcodeReader::ResolveGlobalAndAliasInits() {
     }
     AliasInitWorklist.pop_back();
   }
+
+  while (!FunctionPrefixWorklist.empty()) {
+    unsigned ValID = FunctionPrefixWorklist.back().second;
+    if (ValID >= ValueList.size()) {
+      FunctionPrefixes.push_back(FunctionPrefixWorklist.back());
+    } else {
+      if (Constant *C = dyn_cast<Constant>(ValueList[ValID]))
+        FunctionPrefixWorklist.back().first->setPrefixData(C);
+      else
+        return Error("Function prefix is not a constant!");
+    }
+    FunctionPrefixWorklist.pop_back();
+  }
+
   return false;
 }
 
@@ -1881,6 +1897,8 @@ bool BitcodeReader::ParseModule(bool Resume) {
       if (Record.size() > 9)
         UnnamedAddr = Record[9];
       Func->setUnnamedAddr(UnnamedAddr);
+      if (Record.size() > 10 && Record[10] != 0)
+        FunctionPrefixes.push_back(std::make_pair(Func, Record[10]-1));
       ValueList.push_back(Func);
 
       // If this is a function with a body, remember the prototype we are
-- 
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