[PATCH] D154070: [lld/COFF] Add /dwodir to enable DWARF fission with LTO

[Haohai, Wen via Phabricator via llvm-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rG2a631a8fedc2: [lld/COFF] Add /dwodir to enable DWARF fission with LTO (authored by HaohaiWen).

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D154070/new/

https://reviews.llvm.org/D154070

Files:
  lld/COFF/Config.h
  lld/COFF/Driver.cpp
  lld/COFF/LTO.cpp
  lld/COFF/Options.td
  lld/test/COFF/lto-debug-fission.ll


Index: lld/test/COFF/lto-debug-fission.ll
===================================================================
--- /dev/null
+++ lld/test/COFF/lto-debug-fission.ll
@@ -0,0 +1,18 @@
+; REQUIRES: x86
+
+; RUN: opt %s -o %t1.o
+; RUN: rm -rf %t.dir
+
+; Test to ensure that -dwodir:$DIR creates .dwo files under $DIR
+; RUN: lld-link -dwodir:%t.dir -noentry -dll %t1.o -out:%t.dll
+; RUN: llvm-readobj -h %t.dir/0.dwo | FileCheck %s
+
+; CHECK: Format: COFF-x86-64
+
+target datalayout = "e-m:w-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-windows-msvc"
+
+define void @f() {
+entry:
+  ret void
+}
Index: lld/COFF/Options.td
===================================================================
--- lld/COFF/Options.td
+++ lld/COFF/Options.td
@@ -42,6 +42,8 @@
 def defaultlib : P<"defaultlib", "Add the library to the list of input files">;
 def delayload : P<"delayload", "Delay loaded DLL name">;
 def diasdkdir : P<"diasdkdir", "Set the location of the DIA SDK">;
+def dwodir : P<"dwodir",
+    "Directory to store .dwo files when LTO and debug fission are used">;
 def entry   : P<"entry", "Name of entry point symbol">;
 def errorlimit : P<"errorlimit",
     "Maximum number of errors to emit before stopping (0 = no limit)">;
Index: lld/COFF/LTO.cpp
===================================================================
--- lld/COFF/LTO.cpp
+++ lld/COFF/LTO.cpp
@@ -84,6 +84,7 @@
   c.DisableVerify = true;
 #endif
   c.DiagHandler = diagnosticHandler;
+  c.DwoDir = ctx.config.dwoDir.str();
   c.OptLevel = ctx.config.ltoo;
   c.CPU = getCPUStr();
   c.MAttrs = getMAttrs();
Index: lld/COFF/Driver.cpp
===================================================================
--- lld/COFF/Driver.cpp
+++ lld/COFF/Driver.cpp
@@ -1910,6 +1910,9 @@
     fatal("/manifestinput: requires /manifest:embed");
   }
 
+  // Handle /dwodir
+  config->dwoDir = args.getLastArgValue(OPT_dwodir);
+
   config->thinLTOEmitImportsFiles = args.hasArg(OPT_thinlto_emit_imports_files);
   config->thinLTOIndexOnly = args.hasArg(OPT_thinlto_index_only) ||
                              args.hasArg(OPT_thinlto_index_only_arg);
Index: lld/COFF/Config.h
===================================================================
--- lld/COFF/Config.h
+++ lld/COFF/Config.h
@@ -203,6 +203,9 @@
   StringRef manifestUIAccess = "'false'";
   StringRef manifestFile;
 
+  // used for /dwodir
+  StringRef dwoDir;
+
   // Used for /aligncomm.
   std::map<std::string, int> alignComm;
 


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