From ab1243fe6c01ee7a28a0cb34dc60eaf24eafaf8f Mon Sep 17 00:00:00 2001
From: Adrian Prantl <aprantl@apple.com>
Date: Mon, 29 Jun 2015 23:03:47 +0000
Subject: Add a DIModule metadata node to the IR. It is meant to be used to
 record modules @imported by the current compile unit, so a debugger an import
 the same modules to replicate this environment before dropping into the
 expression evaluator.

DIModule is a sibling to DINamespace and behaves quite similarly.
In addition to the name of the module it also records the module
configuration details that are necessary to uniquely identify the module.
This includes the configuration macros (e.g., -DNDEBUG), the include path
where the module.map file is to be found, and the isysroot.

The idea is that the backend will turn this into a DW_TAG_module.

http://reviews.llvm.org/D9614
rdar://problem/20965932

llvm-svn: 241017
---
 llvm/lib/Bitcode/Reader/BitcodeReader.cpp | 14 ++++++++++++++
 llvm/lib/Bitcode/Writer/BitcodeWriter.cpp | 11 +++++++++++
 2 files changed, 25 insertions(+)

(limited to 'llvm/lib/Bitcode')

diff --git a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
index c47d19356c5..e22420784af 100644
--- a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
+++ b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
@@ -1827,6 +1827,20 @@ std::error_code BitcodeReader::parseMetadata() {
           NextMDValueNo++);
       break;
     }
+
+    case bitc::METADATA_MODULE: {
+      if (Record.size() != 6)
+        return error("Invalid record");
+
+      MDValueList.assignValue(
+          GET_OR_DISTINCT(DIModule, Record[0],
+                          (Context, getMDOrNull(Record[1]),
+                          getMDString(Record[2]), getMDString(Record[3]),
+                          getMDString(Record[4]), getMDString(Record[5]))),
+          NextMDValueNo++);
+      break;
+    }
+
     case bitc::METADATA_FILE: {
       if (Record.size() != 3)
         return error("Invalid record");
diff --git a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
index 673d6f1460d..622f7eaf078 100644
--- a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
+++ b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
@@ -1032,6 +1032,17 @@ static void WriteDINamespace(const DINamespace *N, const ValueEnumerator &VE,
   Record.clear();
 }
 
+static void WriteDIModule(const DIModule *N, const ValueEnumerator &VE,
+                          BitstreamWriter &Stream,
+                          SmallVectorImpl<uint64_t> &Record, unsigned Abbrev) {
+  Record.push_back(N->isDistinct());
+  for (auto &I : N->operands())
+    Record.push_back(VE.getMetadataOrNullID(I));
+
+  Stream.EmitRecord(bitc::METADATA_MODULE, Record, Abbrev);
+  Record.clear();
+}
+
 static void WriteDITemplateTypeParameter(const DITemplateTypeParameter *N,
                                          const ValueEnumerator &VE,
                                          BitstreamWriter &Stream,
-- 
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