ODR violations, add test case.
#include "elfcpp_swap.h"
#include "dwarf.h"
#include "object.h"
+#include "parameters.h"
#include "reloc.h"
#include "dwarf_reader.h"
}
template<int size, bool big_endian>
-Dwarf_line_info<size, big_endian>::Dwarf_line_info(Object* object)
+Sized_dwarf_line_info<size, big_endian>::Sized_dwarf_line_info(Object* object)
: data_valid_(false), buffer_(NULL), symtab_buffer_(NULL),
directories_(), files_(), current_header_index_(-1)
{
template<int size, bool big_endian>
const unsigned char*
-Dwarf_line_info<size, big_endian>::read_header_prolog(
+Sized_dwarf_line_info<size, big_endian>::read_header_prolog(
const unsigned char* lineptr)
{
uint32_t initial_length = elfcpp::Swap<32, big_endian>::readval(lineptr);
template<int size, bool big_endian>
const unsigned char*
-Dwarf_line_info<size, big_endian>::read_header_tables(
+Sized_dwarf_line_info<size, big_endian>::read_header_tables(
const unsigned char* lineptr)
{
++this->current_header_index_;
template<int size, bool big_endian>
bool
-Dwarf_line_info<size, big_endian>::process_one_opcode(
+Sized_dwarf_line_info<size, big_endian>::process_one_opcode(
const unsigned char* start, struct LineStateMachine* lsm, size_t* len)
{
size_t oplen = 0;
template<int size, bool big_endian>
unsigned const char*
-Dwarf_line_info<size, big_endian>::read_lines(unsigned const char* lineptr)
+Sized_dwarf_line_info<size, big_endian>::read_lines(unsigned const char* lineptr)
{
struct LineStateMachine lsm;
template<int size, bool big_endian>
unsigned int
-Dwarf_line_info<size, big_endian>::symbol_section(
+Sized_dwarf_line_info<size, big_endian>::symbol_section(
unsigned int sym,
typename elfcpp::Elf_types<size>::Elf_Addr* value)
{
template<int size, bool big_endian>
void
-Dwarf_line_info<size, big_endian>::read_relocs()
+Sized_dwarf_line_info<size, big_endian>::read_relocs()
{
if (this->symtab_buffer_ == NULL)
return;
template<int size, bool big_endian>
void
-Dwarf_line_info<size, big_endian>::read_line_mappings()
+Sized_dwarf_line_info<size, big_endian>::read_line_mappings()
{
gold_assert(this->data_valid_ == true);
template<int size, bool big_endian>
bool
-Dwarf_line_info<size, big_endian>::input_is_relobj()
+Sized_dwarf_line_info<size, big_endian>::input_is_relobj()
{
// Only .o files have relocs and the symtab buffer that goes with them.
return this->symtab_buffer_ != NULL;
template<int size, bool big_endian>
std::string
-Dwarf_line_info<size, big_endian>::addr2line(unsigned int shndx, off_t offset)
+Sized_dwarf_line_info<size, big_endian>::do_addr2line(unsigned int shndx,
+ off_t offset)
{
if (this->data_valid_ == false)
return "";
return ret;
}
+// Dwarf_line_info routines.
+
+// Note: this routine instantiates the appropriate
+// Sized_dwarf_line_info templates for this config, so we don't have
+// to have a separte instantiation section for them.
+
+std::string
+Dwarf_line_info::one_addr2line(Object* object,
+ unsigned int shndx, off_t offset)
+{
+ if (parameters->get_size() == 32 && !parameters->is_big_endian())
+#ifdef HAVE_TARGET_32_LITTLE
+ return Sized_dwarf_line_info<32, false>(object).addr2line(shndx, offset);
+#else
+ gold_unreachable();
+#endif
+ else if (parameters->get_size() == 32 && parameters->is_big_endian())
+#ifdef HAVE_TARGET_32_BIG
+ return Sized_dwarf_line_info<32, true>(object).addr2line(shndx, offset);
+#else
+ gold_unreachable();
+#endif
+ else if (parameters->get_size() == 64 && !parameters->is_big_endian())
+#ifdef HAVE_TARGET_64_LITTLE
+ return Sized_dwarf_line_info<64, false>(object).addr2line(shndx, offset);
+#else
+ gold_unreachable();
+#endif
+ else if (parameters->get_size() == 64 && parameters->is_big_endian())
+#ifdef HAVE_TARGET_64_BIT
+ return Sized_dwarf_line_info<64, true>(object).addr2line(shndx, offset);
+#else
+ gold_unreachable();
+#endif
+ else
+ gold_unreachable();
+}
+
#ifdef HAVE_TARGET_32_LITTLE
template
-class Dwarf_line_info<32, false>;
+class Sized_dwarf_line_info<32, false>;
#endif
#ifdef HAVE_TARGET_32_BIG
template
-class Dwarf_line_info<32, true>;
+class Sized_dwarf_line_info<32, true>;
#endif
#ifdef HAVE_TARGET_64_LITTLE
template
-class Dwarf_line_info<64, false>;
+class Sized_dwarf_line_info<64, false>;
#endif
#ifdef HAVE_TARGET_64_BIG
template
-class Dwarf_line_info<64, true>;
+class Sized_dwarf_line_info<64, true>;
#endif
} // End namespace gold.
// This class is used to read the line information from the debugging
// section of an object file.
-template<int size, bool big_endian>
class Dwarf_line_info
{
public:
- // Initializes a .debug_line reader for a given object file.
- Dwarf_line_info(Object* object);
+ Dwarf_line_info()
+ { }
+
+ virtual
+ ~Dwarf_line_info()
+ { }
// Given a section number and an offset, returns the associated
// file and line-number, as a string: "file:lineno". If unable
// to do the mapping, returns the empty string. You must call
// read_line_mappings() before calling this function.
std::string
- addr2line(unsigned int shndx, off_t offset);
+ addr2line(unsigned int shndx, off_t offset)
+ { return do_addr2line(shndx, offset); }
+
+ // A helper function for a single addr2line lookup. It uses
+ // parameters() to figure out the size and endianness. This is less
+ // efficient than using the templatized size and endianness, so only
+ // call this from an un-templatized context.
+ static std::string
+ one_addr2line(Object* object, unsigned int shndx, off_t offset);
+
+ private:
+ virtual std::string
+ do_addr2line(unsigned int shndx, off_t offset) = 0;
+};
+
+template<int size, bool big_endian>
+class Sized_dwarf_line_info
+{
+ public:
+ // Initializes a .debug_line reader for a given object file.
+ Sized_dwarf_line_info(Object* object);
+
+ std::string
+ addr2line(unsigned int shndx, off_t offset)
+ { return do_addr2line(shndx, offset); }
private:
+ std::string
+ do_addr2line(unsigned int shndx, off_t offset);
+
// Start processing line info, and populates the offset_map_.
void
read_line_mappings();
std::string filename;
std::string file_and_lineno; // Better than filename-only, if available.
- Dwarf_line_info<size, big_endian> line_info(this->object);
+ Sized_dwarf_line_info<size, big_endian> line_info(this->object);
// This will be "" if we failed to parse the debug info for any reason.
file_and_lineno = line_info.addr2line(this->data_shndx, offset);
&Position_dependent_options::set_static_search),
GENERAL_NOARG('\0', "Bsymbolic", N_("Bind defined symbols locally"),
NULL, ONE_DASH, &General_options::set_symbolic),
+ GENERAL_NOARG('\0', "detect-odr-violations",
+ N_("Try to detect violations of the One Definition Rule"),
+ NULL, TWO_DASHES, &General_options::set_detect_odr_violations),
GENERAL_NOARG('E', "export-dynamic", N_("Export all dynamic symbols"),
NULL, TWO_DASHES, &General_options::set_export_dynamic),
GENERAL_NOARG('\0', "eh-frame-hdr", N_("Create exception frame header"),
is_relocatable_(false),
strip_(STRIP_NONE),
symbolic_(false),
+ detect_odr_violations_(false),
create_eh_frame_hdr_(false),
rpath_(),
rpath_link_(),
symbolic() const
{ return this->symbolic_; }
+ // --detect-odr-violations: Whether to search for One Defn Rule violations.
+ bool
+ detect_odr_violations() const
+ { return this->detect_odr_violations_; }
+
// --eh-frame-hdr: Whether to generate an exception frame header.
bool
create_eh_frame_hdr() const
{ this->symbolic_ = true; }
void
+ set_detect_odr_violations()
+ { this->detect_odr_violations_ = true; }
+
+ void
set_create_eh_frame_hdr()
{ this->create_eh_frame_hdr_ = true; }
bool is_relocatable_;
Strip strip_;
bool symbolic_;
+ bool detect_odr_violations_;
bool create_eh_frame_hdr_;
Dir_list rpath_;
Dir_list rpath_link_;
Parameters::Parameters(Errors* errors)
: errors_(errors), output_file_name_(NULL),
output_file_type_(OUTPUT_INVALID), sysroot_(),
- strip_(STRIP_INVALID), symbolic_(false),
+ strip_(STRIP_INVALID), symbolic_(false), detect_odr_violations_(false),
optimization_level_(0), export_dynamic_(false),
is_doing_static_link_valid_(false), doing_static_link_(false),
is_size_and_endian_valid_(false), size_(0), is_big_endian_(false)
this->output_file_name_ = options->output_file_name();
this->sysroot_ = options->sysroot();
this->symbolic_ = options->symbolic();
+ this->detect_odr_violations_ = options->detect_odr_violations();
this->optimization_level_ = options->optimization_level();
this->export_dynamic_ = options->export_dynamic();
return this->symbolic_;
}
+ // Whether we should try to detect violations of the One Definition Rule.
+ bool
+ detect_odr_violations() const
+ {
+ gold_assert(this->options_valid_);
+ return this->detect_odr_violations_;
+ }
+
// The general linker optimization level.
int
optimization_level() const
Strip strip_;
// Whether we are doing a symbolic link.
bool symbolic_;
+ // Whether we try to detect One Definition Rule violations.
+ bool detect_odr_violations_;
// The optimization level.
int optimization_level_;
// Whether the -E/--export-dynamic flag is set.
// is an ODR violation. But it's helpful to warn about.)
// We use orig_sym here because we want the symbol exactly as it
// appears in the object file, not munged via our future processing.
- if (orig_sym.get_st_bind() == elfcpp::STB_WEAK
+ if (parameters->detect_odr_violations()
+ && orig_sym.get_st_bind() == elfcpp::STB_WEAK
&& to->binding() == elfcpp::STB_WEAK
&& orig_sym.get_st_shndx() != elfcpp::SHN_UNDEF
&& to->shndx() != elfcpp::SHN_UNDEF
void
Symbol_table::detect_odr_violations() const
{
- if (parameters->get_size() == 32)
- {
- if (!parameters->is_big_endian())
- {
-#ifdef HAVE_TARGET_32_LITTLE
- this->sized_detect_odr_violations<32, false>();
-#else
- gold_unreachable();
-#endif
- }
- else
- {
-#ifdef HAVE_TARGET_32_BIG
- this->sized_detect_odr_violations<32, true>();
-#else
- gold_unreachable();
-#endif
- }
- }
- else if (parameters->get_size() == 64)
- {
- if (!parameters->is_big_endian())
- {
-#ifdef HAVE_TARGET_64_LITTLE
- this->sized_detect_odr_violations<64, false>();
-#else
- gold_unreachable();
-#endif
- }
- else
- {
-#ifdef HAVE_TARGET_64_BIG
- this->sized_detect_odr_violations<64, true>();
-#else
- gold_unreachable();
-#endif
- }
- }
- else
- gold_unreachable();
-}
-
-// Implement detect_odr_violations.
-
-template<int size, bool big_endian>
-void
-Symbol_table::sized_detect_odr_violations() const
-{
for (Odr_map::const_iterator it = candidate_odr_violations_.begin();
it != candidate_odr_violations_.end();
++it)
// one Task for object, plus appropriate locking to ensure
// that we don't conflict with other uses of the object.
locs->object->lock();
- Dwarf_line_info<size, big_endian> line_info(locs->object);
+ std::string lineno = Dwarf_line_info::one_addr2line(
+ locs->object, locs->shndx, locs->offset);
locs->object->unlock();
- std::string lineno = line_info.addr2line(locs->shndx, locs->offset);
if (!lineno.empty())
line_nums.insert(lineno);
}
debug_msg.o: debug_msg.cc
$(CXXCOMPILE) -O0 -g -c -w -o $@ $(srcdir)/debug_msg.cc
-debug_msg.err: debug_msg.o
- if $(CXXLINK) -Bgcctestdir/ -o debug_msg debug_msg.o 2>$@; \
+odr_violation1.o: odr_violation1.cc
+ $(CXXCOMPILE) -O0 -g -c -w -o $@ $(srcdir)/odr_violation1.cc
+odr_violation2.o: odr_violation2.cc
+ $(CXXCOMPILE) -O0 -g -c -w -o $@ $(srcdir)/odr_violation2.cc
+debug_msg.err: debug_msg.o odr_violation1.o odr_violation2.o
+ if $(CXXLINK) -Bgcctestdir/ -Wl,--detect-odr-violations -o debug_msg debug_msg.o odr_violation1.o odr_violation2.o 2>$@; \
then \
echo 2>&1 "Link of debug_msg.o should have failed"; \
exit 1; \
@GCC_TRUE@debug_msg.o: debug_msg.cc
@GCC_TRUE@ $(CXXCOMPILE) -O0 -g -c -w -o $@ $(srcdir)/debug_msg.cc
-@GCC_TRUE@debug_msg.err: debug_msg.o
-@GCC_TRUE@ if $(CXXLINK) -Bgcctestdir/ -o debug_msg debug_msg.o 2>$@; \
+@GCC_TRUE@odr_violation1.o: odr_violation1.cc
+@GCC_TRUE@ $(CXXCOMPILE) -O0 -g -c -w -o $@ $(srcdir)/odr_violation1.cc
+@GCC_TRUE@odr_violation2.o: odr_violation2.cc
+@GCC_TRUE@ $(CXXCOMPILE) -O0 -g -c -w -o $@ $(srcdir)/odr_violation2.cc
+@GCC_TRUE@debug_msg.err: debug_msg.o odr_violation1.o odr_violation2.o
+@GCC_TRUE@ if $(CXXLINK) -Bgcctestdir/ -Wl,--detect-odr-violations -o debug_msg debug_msg.o odr_violation1.o odr_violation2.o 2>$@; \
@GCC_TRUE@ then \
@GCC_TRUE@ echo 2>&1 "Link of debug_msg.o should have failed"; \
@GCC_TRUE@ exit 1; \
virtual void virtfn() { undef_fn2(); }
};
+// This tests One Definition Rule (ODR) violations.
+void SortAscending(int array[], int size); // in odr_violation1.cc
+void SortDescending(int array[], int size); // in odr_violation2.cc
+
int main()
{
testfn(5);
Base b;
Derived d;
+ int kInput1[] = {1, 6, 9, 7, 3, 4, 2, 10, 5, 8};
+ int kSize1 = sizeof(kInput1) / sizeof(int);
+ SortAscending(kInput1, kSize1);
+
+ int kInput2[] = {1, 6, 9, 7, 3, 4, 2, 10, 5, 8};
+ int kSize2 = sizeof(kInput2) / sizeof(int);
+ SortDescending(kInput2, kSize2);
+
return 0;
}
check "debug_msg.o: in function int testfn<double>(double):${srcdir}/debug_msg.cc:44: undefined reference to 'undef_fn2()'"
check "debug_msg.o: in function int testfn<double>(double):${srcdir}/debug_msg.cc:45: undefined reference to 'undef_int'"
+# Check we detected the ODR (One Definition Rule) violation.
+check "warning: symbol Ordering::operator()(int, int) *defined in multiple places (possible ODR violation):"
+check "odr_violation1.cc:5"
+check "odr_violation2.cc:5"
+
exit 0
--- /dev/null
+#include <algorithm>
+
+class Ordering {
+ public:
+ bool operator()(int a, int b) {
+ return a < b;
+ }
+};
+
+void SortAscending(int array[], int size) {
+ std::sort(array, array + size, Ordering());
+}
--- /dev/null
+#include <algorithm>
+
+class Ordering {
+ public:
+ bool operator()(int a, int b) {
+ // We need the "+ 1" here to force this operator() to be a
+ // different size than the one in odr_violation1.cc.
+ return a + 1 > b + 1;
+ }
+};
+
+void SortDescending(int array[], int size) {
+ std::sort(array, array + size, Ordering());
+}
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