[PATCH] D41438: [ELF] - Do not handle --defsym as regular linkerscript assignment.
George Rimar via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Sat Dec 23 22:07:36 PST 2017
grimar updated this revision to Diff 128096.
grimar added a comment.
- Rebased, updated.
https://reviews.llvm.org/D41438
Files:
ELF/LinkerScript.cpp
ELF/LinkerScript.h
ELF/ScriptParser.cpp
test/ELF/linkerscript/symbol-multiple-defs.s
Index: test/ELF/linkerscript/symbol-multiple-defs.s
===================================================================
--- test/ELF/linkerscript/symbol-multiple-defs.s
+++ test/ELF/linkerscript/symbol-multiple-defs.s
@@ -0,0 +1,14 @@
+# REQUIRES: x86
+# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t
+
+# RUN: echo "foo = 0x3;" > %t.script
+# RUN: ld.lld -o %t1 --script %t.script %t
+# RUN: llvm-objdump -t %t1 | FileCheck %s --check-prefix=SCRIPT
+# SCRIPT: 0000000000000003 *ABS* 00000000 foo
+
+# RUN: not ld.lld --defsym=foo=0x3 -o %t2 %t 2>&1 \
+# RUN: | FileCheck %s --check-prefix=ERR
+# ERR: duplicate symbol: foo
+
+.global foo
+foo:
Index: ELF/ScriptParser.cpp
===================================================================
--- ELF/ScriptParser.cpp
+++ ELF/ScriptParser.cpp
@@ -277,6 +277,7 @@
if (!atEOF())
setError("EOF expected, but got " + next());
SymbolAssignment *Cmd = make<SymbolAssignment>(Name, E, getCurrentLocation());
+ Cmd->IsDefsym = true;
Script->SectionCommands.push_back(Cmd);
}
Index: ELF/LinkerScript.h
===================================================================
--- ELF/LinkerScript.h
+++ ELF/LinkerScript.h
@@ -104,6 +104,9 @@
bool Provide = false;
bool Hidden = false;
+ // Flag shows if this command is -defsym assignment.
+ bool IsDefsym = false;
+
// Holds file name and line number for error reporting.
std::string Location;
};
Index: ELF/LinkerScript.cpp
===================================================================
--- ELF/LinkerScript.cpp
+++ ELF/LinkerScript.cpp
@@ -129,9 +129,6 @@
// Define a symbol.
Symbol *Sym;
uint8_t Visibility = Cmd->Hidden ? STV_HIDDEN : STV_DEFAULT;
- std::tie(Sym, std::ignore) = Symtab->insert(Cmd->Name, /*Type*/ 0, Visibility,
- /*CanOmitFromDynSym*/ false,
- /*File*/ nullptr);
ExprValue Value = Cmd->Expression();
SectionBase *Sec = Value.isAbsolute() ? nullptr : Value.Sec;
@@ -148,8 +145,21 @@
// write expressions like this: `alignment = 16; . = ALIGN(., alignment)`.
uint64_t SymValue = Value.Sec ? 0 : Value.getValue();
- replaceSymbol<Defined>(Sym, nullptr, Cmd->Name, STB_GLOBAL, Visibility,
- STT_NOTYPE, SymValue, 0, Sec);
+ // Regular linker script assignment may be used to update existent symbol
+ // value, but --defsym assignment should always create new symbol and report
+ // duplicate symbol definition error if symbol already exists.
+ if (Cmd->IsDefsym) {
+ Sym = Symtab->addRegular(Cmd->Name, Visibility, STT_NOTYPE, SymValue,
+ /*Size=*/0, STB_GLOBAL, Sec,
+ /*File=*/nullptr);
+ } else {
+ std::tie(Sym, std::ignore) =
+ Symtab->insert(Cmd->Name, /*Type*/ 0, Visibility,
+ /*CanOmitFromDynSym*/ false,
+ /*File*/ nullptr);
+ replaceSymbol<Defined>(Sym, nullptr, Cmd->Name, STB_GLOBAL, Visibility,
+ STT_NOTYPE, SymValue, 0, Sec);
+ }
Cmd->Sym = cast<Defined>(Sym);
}
-------------- next part --------------
A non-text attachment was scrubbed...
Name: D41438.128096.patch
Type: text/x-patch
Size: 3136 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20171224/ad9d71b1/attachment.bin>
More information about the llvm-commits
mailing list