[ELF] Support archive:file syntax in input section descriptions

[MaskRay]

Summary

Fixes https://bugs.llvm.org/show_bug.cgi?id=44450

https://sourceware.org/binutils/docs/ld/Input-Section-Basics.html#Input-Section-Basics

The following two rules are not implemented.

• archive: matches every file in the archive.
• :file matches a file not in an archive.

[ruiu]

LGTM

[grimar]

LGTM

lld/test/ELF/linkerscript/input-archive.s

9

Add a test case description?

[MaskRay]

Add a comment.

Unsupport Windows (backslashes in a path)

lld/ELF/LinkerScript.cpp

void LinkerScript::assignSymbol(SymbolAssignment *cmd, bool inSec) {
   }
 }
 
 static std::string getFilename(InputFile *file) {
   if (!file)
     return "";
   if (file->archiveName.empty())
     return std::string(file->getName());
-  return (file->archiveName + "(" + file->getName() + ")").str();
+  return (file->archiveName + ':' + file->getName()).str();
 }
 
 bool LinkerScript::shouldKeep(InputSectionBase *s) {
   if (keptSections.empty())
     return false;
   std::string filename = getFilename(s->file);
   for (InputSectionDescription *id : keptSections)
     if (id->filePat.match(filename))

lld/test/ELF/linkerscript/input-archive.s

+# REQUIRES: x86
+# UNSUPPORTED: system-windows
+## Test that archive:file is supported in an input section description.
+
+# RUN: mkdir -p %t.dir
+# RUN: echo '.data; .byte 1' | llvm-mc -filetype=obj -triple=x86_64 - -o %t.dir/a.o
+# RUN: llvm-mc -filetype=obj -triple=x86_64 %s -o %t.dir/b.o
+# RUN: rm -f %t.a
+# RUN: llvm-ar rc %t.a %t.dir/a.o %t.dir/b.o
+
+## *.a:b.o matches /path/to/input-archive.s.tmp.a:b.o
+## *b.o matches /path/to/input-archive.s.tmp.a:b.o
+# RUN: echo 'SECTIONS { \
+# RUN:   .foo : { %t.a:a.o(.data) } \
+# RUN:   .bar : { *.a:b.o(.data) } \
+# RUN:   .qux : { *b.o(.data1) } \
+# RUN:   }' > %t.script
+# RUN: ld.lld -T %t.script --whole-archive %t.a -o %t
+# RUN: llvm-readelf -x .foo -x .bar -x .qux %t | FileCheck %s
+
+# CHECK:      Hex dump of section '.foo':
+# CHECK-NEXT: 0x00000000 01
+# CHECK:      Hex dump of section '.bar':
+# CHECK-NEXT: 0x00000001 02
+# CHECK:      Hex dump of section '.qux':
+# CHECK-NEXT: 0x00000002 03
+
+.data
+.byte 2
+
+.section .data1,"aw",@progbits
+.byte 3