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binutils-gdb
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From Craig Silverstein: Rework debug info code a bit, add option for 

ODR violations, add test case.
This commit is contained in:
Ian Lance Taylor 2007-11-14 01:03:01 +00:00
parent b3c8c50a8f
commit a55ce7febf
15 changed files with 174 additions and 75 deletions
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68
gold/dwarf_reader.cc
View File

@ -25,6 +25,7 @@
#include "elfcpp_swap.h"
#include "dwarf.h"
#include "object.h"
#include "parameters.h"
#include "reloc.h"
#include "dwarf_reader.h"
@ -117,7 +118,7 @@ ResetLineStateMachine(struct LineStateMachine* lsm, bool default_is_stmt)
}
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)
{
@ -177,7 +178,7 @@ Dwarf_line_info<size, big_endian>::Dwarf_line_info(Object* object)
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);
@ -238,7 +239,7 @@ Dwarf_line_info<size, big_endian>::read_header_prolog(
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_;
@ -311,7 +312,7 @@ Dwarf_line_info<size, big_endian>::read_header_tables(
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;
@ -490,7 +491,7 @@ Dwarf_line_info<size, big_endian>::process_one_opcode(
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;
@ -530,7 +531,7 @@ Dwarf_line_info<size, big_endian>::read_lines(unsigned const char* lineptr)
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)
{
@ -545,7 +546,7 @@ Dwarf_line_info<size, big_endian>::symbol_section(
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;
@ -565,7 +566,7 @@ Dwarf_line_info<size, big_endian>::read_relocs()
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);
@ -595,7 +596,7 @@ Dwarf_line_info<size, big_endian>::read_line_mappings()
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;
@ -606,7 +607,8 @@ Dwarf_line_info<size, big_endian>::input_is_relobj()
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 "";
@ -669,24 +671,62 @@ Dwarf_line_info<size, big_endian>::addr2line(unsigned int shndx, off_t offset)
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.

38
gold/dwarf_reader.h
View File

@ -41,21 +41,51 @@ struct LineStateMachine;
// 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();

2
gold/object.cc
View File

@ -1093,7 +1093,7 @@ Relocate_info<size, big_endian>::location(size_t, off_t offset) const
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);

4
gold/options.cc
View File

@ -353,6 +353,9 @@ options::Command_line_options::options[] =
&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"),
@ -473,6 +476,7 @@ General_options::General_options()
is_relocatable_(false),
strip_(STRIP_NONE),
symbolic_(false),
detect_odr_violations_(false),
create_eh_frame_hdr_(false),
rpath_(),
rpath_link_(),

10
gold/options.h
View File

@ -153,6 +153,11 @@ class General_options
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
@ -299,6 +304,10 @@ class General_options
set_symbolic()
{ 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; }
@ -412,6 +421,7 @@ class General_options
bool is_relocatable_;
Strip strip_;
bool symbolic_;
bool detect_odr_violations_;
bool create_eh_frame_hdr_;
Dir_list rpath_;
Dir_list rpath_link_;

3
gold/parameters.cc
View File

@ -33,7 +33,7 @@ namespace gold
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)
@ -48,6 +48,7 @@ Parameters::set_from_options(const General_options* options)
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();

10
gold/parameters.h
View File

@ -121,6 +121,14 @@ class Parameters
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
@ -218,6 +226,8 @@ class Parameters
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.

3
gold/resolve.cc
View File

@ -243,7 +243,8 @@ Symbol_table::resolve(Sized_symbol<size>* to,
// 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

52
gold/symtab.cc
View File

@ -1807,54 +1807,6 @@ Symbol_table::sized_write_section_symbol(const Output_section* os,
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();
@ -1874,9 +1826,9 @@ Symbol_table::sized_detect_odr_violations() const
// 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);
}

8
gold/testsuite/Makefile.am
View File

@ -118,8 +118,12 @@ if GCC
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; \

8
gold/testsuite/Makefile.in
View File

@ -1206,8 +1206,12 @@ uninstall-am: uninstall-info-am
@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; \

12
gold/testsuite/debug_msg.cc
View File

@ -55,6 +55,10 @@ class Derived : public Base
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);
@ -63,5 +67,13 @@ int main()
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;
}

5
gold/testsuite/debug_msg.sh
View File

@ -55,4 +55,9 @@ check "debug_msg.o: in function int testfn<double>(double):${srcdir}/debug_msg.c
check "debug_msg.o: in function int testfn<double>(double):${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

12
gold/testsuite/odr_violation1.cc Normal file
View File

@ -0,0 +1,12 @@
#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());
}

14
gold/testsuite/odr_violation2.cc Normal file
View File

@ -0,0 +1,14 @@
#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());
}