From 044eb2f6afba375a914ac9d8024f8f5142bb912e Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Mon, 18 Dec 2017 20:10:56 +0000
Subject: Vendor import of llvm trunk r321017:
 https://llvm.org/svn/llvm-project/llvm/trunk@321017

---
 lib/DebugInfo/MSF/MSFCommon.cpp | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

(limited to 'lib/DebugInfo/MSF/MSFCommon.cpp')

diff --git a/lib/DebugInfo/MSF/MSFCommon.cpp b/lib/DebugInfo/MSF/MSFCommon.cpp
index 1facf5efb4bbb..d7e1dcf31a3a4 100644
--- a/lib/DebugInfo/MSF/MSFCommon.cpp
+++ b/lib/DebugInfo/MSF/MSFCommon.cpp
@@ -59,3 +59,27 @@ Error llvm::msf::validateSuperBlock(const SuperBlock &SB) {
 
   return Error::success();
 }
+
+MSFStreamLayout llvm::msf::getFpmStreamLayout(const MSFLayout &Msf,
+                                              bool IncludeUnusedFpmData,
+                                              bool AltFpm) {
+  MSFStreamLayout FL;
+  uint32_t NumFpmIntervals = getNumFpmIntervals(Msf, IncludeUnusedFpmData);
+  support::ulittle32_t FpmBlock = Msf.SB->FreeBlockMapBlock;
+  assert(FpmBlock == 1 || FpmBlock == 2);
+  if (AltFpm) {
+    // If they requested the alternate FPM, then 2 becomes 1 and 1 becomes 2.
+    FpmBlock = 3U - FpmBlock;
+  }
+  for (uint32_t I = 0; I < NumFpmIntervals; ++I) {
+    FL.Blocks.push_back(FpmBlock);
+    FpmBlock += msf::getFpmIntervalLength(Msf);
+  }
+
+  if (IncludeUnusedFpmData)
+    FL.Length = NumFpmIntervals * Msf.SB->BlockSize;
+  else
+    FL.Length = divideCeil(Msf.SB->NumBlocks, 8);
+
+  return FL;
+}
-- 
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