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[lld][WebAssembly] Use the archive offset with --whole-archive (#78791)

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This essentially ports 0b1413a8 from the ELF linker.
This commit is contained in:
Sam Clegg 2024-01-19 14:42:03 -08:00 committed by GitHub
parent f9bc1ee3fc
commit 39e024d9e2
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2 changed files with 40 additions and 5 deletions
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34
lld/test/wasm/lto/thin-archivecollision.ll Normal file
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@ -0,0 +1,34 @@
; Based on lld/test/ELF/lto/thin-archivecollision.ll
; RUN: opt -module-summary %s -o %t.o
; RUN: mkdir -p %t1 %t2
; RUN: opt -module-summary %p/Inputs/thin1.ll -o %t1/t.coll.o
; RUN: opt -module-summary %p/Inputs/thin2.ll -o %t2/t.coll.o
; RUN: rm -f %t.a
; RUN: llvm-ar rcs %t.a %t1/t.coll.o %t2/t.coll.o
; RUN: wasm-ld %t.o %t.a -o %t
; RUN: obj2yaml %t | FileCheck %s
; Check we handle this case correctly even in presence of --whole-archive.
; RUN: wasm-ld %t.o --whole-archive %t.a -o %t
; RUN: obj2yaml %t | FileCheck %s
; CHECK: Name: _start
; CHECK: Name: foo
; CHECK: Name: blah
target datalayout = "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-n32:64-S128"
target triple = "wasm32-unknown-unknown"
define i32 @_start() #0 {
entry:
%call = call i32 @foo(i32 23)
%call1 = call i32 @blah(i32 37)
ret i32 0
}
declare i32 @foo(i32) #1
declare i32 @blah(i32) #1
attributes #0 = { noinline optnone }

11
lld/wasm/Driver.cpp
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@ -233,19 +233,20 @@ static void readImportFile(StringRef filename) {
// Returns slices of MB by parsing MB as an archive file.
// Each slice consists of a member file in the archive.
std::vector<MemoryBufferRef> static getArchiveMembers(MemoryBufferRef mb) {
std::vector<std::pair<MemoryBufferRef, uint64_t>> static getArchiveMembers(
MemoryBufferRef mb) {
std::unique_ptr<Archive> file =
CHECK(Archive::create(mb),
mb.getBufferIdentifier() + ": failed to parse archive");
std::vector<MemoryBufferRef> v;
std::vector<std::pair<MemoryBufferRef, uint64_t>> v;
Error err = Error::success();
for (const Archive::Child &c : file->children(err)) {
MemoryBufferRef mbref =
CHECK(c.getMemoryBufferRef(),
mb.getBufferIdentifier() +
": could not get the buffer for a child of the archive");
v.push_back(mbref);
v.push_back(std::make_pair(mbref, c.getChildOffset()));
}
if (err)
fatal(mb.getBufferIdentifier() +
@ -273,8 +274,8 @@ void LinkerDriver::addFile(StringRef path) {
// Handle -whole-archive.
if (inWholeArchive) {
for (MemoryBufferRef &m : getArchiveMembers(mbref)) {
auto *object = createObjectFile(m, path);
for (const auto &[m, offset] : getArchiveMembers(mbref)) {
auto *object = createObjectFile(m, path, offset);
// Mark object as live; object members are normally not
// live by default but -whole-archive is designed to treat
// them as such.