[WebAssembly] Add --reproduce.

--reproduce is a convenient option for debugging. If you invoke lld
with `--reproduce=repro.tar`, it creates `repro.tar` with all input
files and the command line options given to the linker, so that it is
very easy to run lld with the exact same inputs.

ELF and Windows lld have this option.

This patch add that option to lld/wasm.

Differential Revision: https://reviews.llvm.org/D62170

llvm-svn: 361244

1 files changed, 6 insertions, 0 deletions

diff --git a/lld/wasm/InputFiles.cpp b/lld/wasm/InputFiles.cpp
index b53818ca4da..185a865dcab 100644
--- a/lld/wasm/InputFiles.cpp
+++ b/lld/wasm/InputFiles.cpp
@@ -14,8 +14,10 @@
 #include "SymbolTable.h"
 #include "lld/Common/ErrorHandler.h"
 #include "lld/Common/Memory.h"
+#include "lld/Common/Reproduce.h"
 #include "llvm/Object/Binary.h"
 #include "llvm/Object/Wasm.h"
+#include "llvm/Support/TarWriter.h"
 #include "llvm/Support/raw_ostream.h"
 
 #define DEBUG_TYPE "lld"
@@ -27,6 +29,8 @@ using namespace llvm;
 using namespace llvm::object;
 using namespace llvm::wasm;
 
+std::unique_ptr<llvm::TarWriter> lld::wasm::Tar;
+
 Optional<MemoryBufferRef> lld::wasm::readFile(StringRef Path) {
   log("Loading: " + Path);
 
@@ -39,6 +43,8 @@ Optional<MemoryBufferRef> lld::wasm::readFile(StringRef Path) {
   MemoryBufferRef MBRef = MB->getMemBufferRef();
   make<std::unique_ptr<MemoryBuffer>>(std::move(MB)); // take MB ownership
 
+  if (Tar)
+    Tar->append(relativeToRoot(Path), MBRef.getBuffer());
   return MBRef;
 }