This patch implements evaluation of the GNU ld EXTERN command.
llvm-svn: 232111
/// Represents an extern command.
class Extern : public Command {
public:
+ typedef llvm::ArrayRef<StringRef>::const_iterator const_iterator;
+
Extern(Parser &ctx,
const SmallVectorImpl<StringRef> &symbols)
: Command(ctx, Kind::Extern) {
}
void dump(raw_ostream &os) const override;
+ const_iterator begin() const { return _symbols.begin(); }
+ const_iterator end() const { return _symbols.end(); }
private:
llvm::ArrayRef<StringRef> _symbols;
ctx.setEntrySymbolName(entry->getEntryName());
if (auto *output = dyn_cast<script::Output>(c))
ctx.setOutputPath(output->getOutputFileName());
+ if (auto *externs = dyn_cast<script::Extern>(c)) {
+ for (auto symbol : *externs) {
+ ctx.addInitialUndefinedSymbol(symbol);
+ }
+ }
}
// Transfer ownership of the script to the linking context
ctx.addLinkerScript(std::move(parser));
--- /dev/null
+/* A simple valid linker script used for testing the EXTERN command.
+ */
+EXTERN(_foo bar __baz)
--- /dev/null
+# Check symbols defined with the EXTERN command are added as undefined
+# symbols.
+
+# RUN: lld -flavor gnu -target x86_64 -T %p/Inputs/externs.ls -r %s \
+# RUN: --output-filetype=yaml | FileCheck %s
+
+defined-atoms:
+ - name: main
+ scope: global
+ content: [ B8, 00, 00, 00, 00, C7, 44, 24, FC, 00, 00, 00, 00, C3 ]
+ alignment: 2^4
+ section-choice: custom-required
+ section-name: .text
+
+# CHECK: undefined-atoms:
+# CHECK: - name: _foo
+# CHECK: can-be-null: at-buildtime
+# CHECK: - name: bar
+# CHECK: can-be-null: at-buildtime
+# CHECK: - name: __baz
+# CHECK: can-be-null: at-buildtime