From 44d5401b8d64161fb9d057c8ec47bbc917e87247 Mon Sep 17 00:00:00 2001 From: Anna Henningsen Date: Thu, 24 Jan 2019 17:27:53 +0100 Subject: [PATCH] deps: cherry-pick fc0ddf5 from upstream V8 Original commit message: [snapshot] Always align embedded blob code pointer and size Other platforms besides ARM64 Windows may also have alignment requirements, e.g. PPC and s390. These requirements may affect both the code pointer field and the size field, and so they each need alignment directives because they are stored in different sections. Since aligning wastes a handful of bytes at most, not making alignment conditional on the platform type seems like a good idea. Refs: https://github.com/nodejs/node/pull/24875 Change-Id: I1f58606af294be65e74a1f107cd05fc21e032704 Reviewed-on: https://chromium-review.googlesource.com/c/1433778 Commit-Queue: Jakob Gruber Reviewed-by: Jakob Gruber Cr-Commit-Position: refs/heads/master@{#59058} Refs: https://github.com/v8/v8/commit/fc0ddf551216761f5a9ecb07958fe92bbc8a9bc2 PR-URL: https://github.com/nodejs/node/pull/25852 Reviewed-By: Ujjwal Sharma Reviewed-By: Matteo Collina Reviewed-By: Ali Ijaz Sheikh --- common.gypi | 2 +- deps/v8/src/snapshot/embedded-file-writer.cc | 10 ++++------ deps/v8/src/snapshot/embedded-file-writer.h | 1 + 3 files changed, 6 insertions(+), 7 deletions(-) diff --git a/common.gypi b/common.gypi index 3b99d4a36e91d4..a36737086c2f2d 100644 --- a/common.gypi +++ b/common.gypi @@ -37,7 +37,7 @@ # Reset this number to 0 on major V8 upgrades. # Increment by one for each non-official patch applied to deps/v8. - 'v8_embedder_string': '-node.0', + 'v8_embedder_string': '-node.1', ##### V8 defaults for Node.js ##### diff --git a/deps/v8/src/snapshot/embedded-file-writer.cc b/deps/v8/src/snapshot/embedded-file-writer.cc index 36a5f0e88b5406..2a08d05170f177 100644 --- a/deps/v8/src/snapshot/embedded-file-writer.cc +++ b/deps/v8/src/snapshot/embedded-file-writer.cc @@ -561,13 +561,11 @@ void PlatformDependentEmbeddedFileWriter::AlignToCodeAlignment() { } void PlatformDependentEmbeddedFileWriter::AlignToDataAlignment() { -#if defined(V8_OS_WIN) && defined(V8_TARGET_ARCH_ARM64) - // On Windows ARM64, instruction "ldr xt,[xn,v8_Default_embedded_blob_]" is - // generated by clang-cl to load elements in v8_Default_embedded_blob_. - // The generated instruction has scale 3 which requires the load target to be - // aligned at 8 bytes (2^3). + // On Windows ARM64, s390, PPC and possibly more platforms, aligned load + // instructions are used to retrieve v8_Default_embedded_blob_ and/or + // v8_Default_embedded_blob_size_. The generated instructions require the + // load target to be aligned at 8 bytes (2^3). fprintf(fp_, ".balign 8\n"); -#endif } void PlatformDependentEmbeddedFileWriter::Comment(const char* string) { diff --git a/deps/v8/src/snapshot/embedded-file-writer.h b/deps/v8/src/snapshot/embedded-file-writer.h index 55e134cd47f61f..8323c4d53b7849 100644 --- a/deps/v8/src/snapshot/embedded-file-writer.h +++ b/deps/v8/src/snapshot/embedded-file-writer.h @@ -286,6 +286,7 @@ class EmbeddedFileWriter : public EmbeddedFileWriterInterface { w->Comment("The size of the embedded blob in bytes."); w->SectionRoData(); + w->AlignToDataAlignment(); w->DeclareUint32(embedded_blob_size_symbol, blob->size()); w->Newline(); }