From f25c01353c492b47dc6f230257822ed54d554c95 Mon Sep 17 00:00:00 2001 From: Tom Tromey Date: Thu, 31 Jan 2013 19:52:03 +0000 Subject: [PATCH] PR gdb/13987: * jit.c (struct jit_inferior_data) : New fields. (jit_breakpoint_re_set_internal): Fix logging. Only create breakpoint if cached address has changed. (jit_update_inferior_cache, jit_breakpoint_deleted): New functions. (_initialize_jit): Register breakpoint deleted observer. gdb/testsuite * gdb.base/jit.exp (compile_jit_test): New proc. Add PIE tests. --- gdb/ChangeLog | 11 +++++ gdb/jit.c | 107 +++++++++++++++++++++++++++++++++-------- gdb/testsuite/ChangeLog | 5 ++ gdb/testsuite/gdb.base/jit.exp | 60 +++++++++++++++-------- 4 files changed, 144 insertions(+), 39 deletions(-) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 5482a52..cbcbf16 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,14 @@ +2013-01-31 Tom Tromey + + PR gdb/13987: + * jit.c (struct jit_inferior_data) : New fields. + (jit_breakpoint_re_set_internal): Fix logging. Only create + breakpoint if cached address has changed. + (jit_update_inferior_cache, jit_breakpoint_deleted): New + functions. + (_initialize_jit): Register breakpoint deleted observer. + 2013-01-31 Aleksandar Ristovski * infrun.c (handle_syscall_event): Remove unused gdbarch. diff --git a/gdb/jit.c b/gdb/jit.c index 62fe97b..a2a9b9e 100644 --- a/gdb/jit.c +++ b/gdb/jit.c @@ -243,9 +243,24 @@ struct jit_inferior_data symbols. */ struct objfile *objfile; + + /* If this inferior has __jit_debug_register_code, this is the + cached address from the minimal symbol. This is used to detect + relocations requiring the breakpoint to be re-created. */ + + CORE_ADDR cached_code_address; + + /* This is the JIT event breakpoint, or NULL if it has not been + set. */ + + struct breakpoint *jit_breakpoint; }; -/* Per-objfile structure recording the addresses in the inferior. */ +/* Per-objfile structure recording the addresses in the inferior. + This object serves two purposes: for ordinary objfiles, it may + cache some symbols related to the JIT interface; and for + JIT-created objfiles, it holds some information about the + jit_code_entry. */ struct jit_objfile_data { @@ -255,7 +270,8 @@ struct jit_objfile_data /* Symbol for __jit_debug_descriptor. */ struct minimal_symbol *descriptor; - /* Address of struct jit_code_entry in this objfile. */ + /* Address of struct jit_code_entry in this objfile. This is only + non-zero for objfiles that represent code created by the JIT. */ CORE_ADDR addr; }; @@ -968,6 +984,44 @@ jit_find_objf_with_entry_addr (CORE_ADDR entry_addr) return NULL; } +/* A callback for iterate_over_inferiors that updates the inferior's + JIT breakpoint information, if necessary. */ + +static int +jit_update_inferior_cache (struct inferior *inf, void *data) +{ + struct bp_location *loc = data; + + if (inf->pspace == loc->pspace) + { + struct jit_inferior_data *inf_data; + + inf_data = inferior_data (inf, jit_inferior_data); + if (inf_data != NULL && inf_data->jit_breakpoint == loc->owner) + { + inf_data->cached_code_address = 0; + inf_data->jit_breakpoint = NULL; + } + } + + return 0; +} + +/* This is called when a breakpoint is deleted. It updates the + inferior's cache, if needed. */ + +static void +jit_breakpoint_deleted (struct breakpoint *b) +{ + struct bp_location *iter; + + if (b->type != bp_jit_event) + return; + + for (iter = b->loc; iter != NULL; iter = iter->next) + iterate_over_inferiors (jit_update_inferior_cache, iter); +} + /* (Re-)Initialize the jit breakpoint if necessary. Return 0 on success. */ @@ -978,36 +1032,47 @@ jit_breakpoint_re_set_internal (struct gdbarch *gdbarch, struct minimal_symbol *reg_symbol, *desc_symbol; struct objfile *objf; struct jit_objfile_data *objf_data; + CORE_ADDR addr; - if (inf_data->objfile != NULL) - return 0; - - /* Lookup the registration symbol. If it is missing, then we assume - we are not attached to a JIT. */ - reg_symbol = lookup_minimal_symbol_and_objfile (jit_break_name, &objf); - if (reg_symbol == NULL || SYMBOL_VALUE_ADDRESS (reg_symbol) == 0) - return 1; + if (inf_data->objfile == NULL) + { + /* Lookup the registration symbol. If it is missing, then we + assume we are not attached to a JIT. */ + reg_symbol = lookup_minimal_symbol_and_objfile (jit_break_name, &objf); + if (reg_symbol == NULL || SYMBOL_VALUE_ADDRESS (reg_symbol) == 0) + return 1; - desc_symbol = lookup_minimal_symbol (jit_descriptor_name, NULL, objf); - if (desc_symbol == NULL || SYMBOL_VALUE_ADDRESS (desc_symbol) == 0) - return 1; + desc_symbol = lookup_minimal_symbol (jit_descriptor_name, NULL, objf); + if (desc_symbol == NULL || SYMBOL_VALUE_ADDRESS (desc_symbol) == 0) + return 1; - objf_data = get_jit_objfile_data (objf); - objf_data->register_code = reg_symbol; - objf_data->descriptor = desc_symbol; + objf_data = get_jit_objfile_data (objf); + objf_data->register_code = reg_symbol; + objf_data->descriptor = desc_symbol; - inf_data->objfile = objf; + inf_data->objfile = objf; + } + else + objf_data = get_jit_objfile_data (inf_data->objfile); - jit_inferior_init (gdbarch); + addr = SYMBOL_VALUE_ADDRESS (objf_data->register_code); if (jit_debug) fprintf_unfiltered (gdb_stdlog, "jit_breakpoint_re_set_internal, " "breakpoint_addr = %s\n", - paddress (gdbarch, SYMBOL_VALUE_ADDRESS (reg_symbol))); + paddress (gdbarch, addr)); + + if (inf_data->cached_code_address == addr) + return 1; + + /* Delete the old breakpoint. */ + if (inf_data->jit_breakpoint != NULL) + delete_breakpoint (inf_data->jit_breakpoint); /* Put a breakpoint in the registration symbol. */ - create_jit_event_breakpoint (gdbarch, SYMBOL_VALUE_ADDRESS (reg_symbol)); + inf_data->cached_code_address = addr; + inf_data->jit_breakpoint = create_jit_event_breakpoint (gdbarch, addr); return 0; } @@ -1419,6 +1484,8 @@ _initialize_jit (void) &setdebuglist, &showdebuglist); observer_attach_inferior_exit (jit_inferior_exit_hook); + observer_attach_breakpoint_deleted (jit_breakpoint_deleted); + jit_objfile_data = register_objfile_data_with_cleanup (NULL, free_objfile_data); jit_inferior_data = diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog index 6366a13..99236cb 100644 --- a/gdb/testsuite/ChangeLog +++ b/gdb/testsuite/ChangeLog @@ -1,5 +1,10 @@ 2013-01-31 Tom Tromey + * gdb.base/jit.exp (compile_jit_test): New proc. + Add PIE tests. + +2013-01-31 Tom Tromey + * gdb.dwarf2/method-ptr.cc: New file. * gdb.dwarf2/method-ptr.exp: New file. diff --git a/gdb/testsuite/gdb.base/jit.exp b/gdb/testsuite/gdb.base/jit.exp index b904b78..35840be 100644 --- a/gdb/testsuite/gdb.base/jit.exp +++ b/gdb/testsuite/gdb.base/jit.exp @@ -28,28 +28,38 @@ if {[get_compiler_info]} { # test running programs # -set testfile jit-main -set srcfile ${testfile}.c -set binfile ${objdir}/${subdir}/${testfile} -if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } { - untested jit.exp - return -1 -} +proc compile_jit_test {testname options} { + global testfile srcfile binfile srcdir subdir + global solib_testfile solib_srcfile solib_binfile solib_binfile_test_msg + global solib_binfile_target + + set testfile jit-main + set srcfile ${testfile}.c + set binfile [standard_output_file $testfile] + if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" \ + executable [concat debug $options]] != "" } { + untested $testname + return -1 + } -set solib_testfile "jit-solib" -set solib_srcfile "${srcdir}/${subdir}/${solib_testfile}.c" -set solib_binfile "${objdir}/${subdir}/${solib_testfile}.so" -set solib_binfile_test_msg "SHLIBDIR/${solib_testfile}.so" + set solib_testfile "jit-solib" + set solib_srcfile "${srcdir}/${subdir}/${solib_testfile}.c" + set solib_binfile [standard_output_file ${solib_testfile}.so] + set solib_binfile_test_msg "SHLIBDIR/${solib_testfile}.so" + + # Note: compiling without debug info: the library goes through + # symbol renaming by munging on its symbol table, and that + # wouldn't work for .debug sections. Also, output for "info + # function" changes when debug info is present. + if { [gdb_compile_shlib ${solib_srcfile} ${solib_binfile} {-fPIC}] != "" } { + untested $testname + return -1 + } -# Note: compiling without debug info: the library goes through symbol -# renaming by munging on its symbol table, and that wouldn't work for .debug -# sections. Also, output for "info function" changes when debug info is resent. -if { [gdb_compile_shlib ${solib_srcfile} ${solib_binfile} {-fPIC}] != "" } { - untested jit.exp - return -1 -} + set solib_binfile_target [gdb_download ${solib_binfile}] -set solib_binfile_target [gdb_download ${solib_binfile}] + return 0 +} proc one_jit_test {count match_str} { with_test_prefix "one_jit_test-$count" { global verbose testfile solib_binfile_target solib_binfile_test_msg @@ -93,5 +103,17 @@ proc one_jit_test {count match_str} { with_test_prefix "one_jit_test-$count" { "All functions matching regular expression \"jit_function\":" }} +if {[compile_jit_test jit.exp {}] < 0} { + return +} one_jit_test 1 "${hex} jit_function_0000" one_jit_test 2 "${hex} jit_function_0000\[\r\n\]+${hex} jit_function_0001" + +with_test_prefix PIE { + if {[compile_jit_test "jit.exp PIE tests" \ + {additional_flags=-fPIE ldflags=-pie}] < 0} { + return + } + + one_jit_test 1 "${hex} jit_function_0000" +} -- 2.7.4