From: Joseph Myers Date: Sun, 19 Aug 2007 23:07:15 +0000 (+0100) Subject: dwarf2out.c (text_section_used, [...]): New. X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=9e9f8522652b0c63b552197bc6719fa27b106f74;p=gcc.git dwarf2out.c (text_section_used, [...]): New. * dwarf2out.c (text_section_used, cold_text_section_used, cold_text_section, dwarf2out_note_section_used): New. (dwarf2out_init): Initialize cold_text_section. (dwarf2out_switch_text_section, dwarf2out_begin_function): Call dwarf2out_note_section_used. (size_of_aranges): Only count entry for text section if it was used. Count entry for cold text section if it was used. (output_aranges): Only output entries for text section and cold text section if they were used. testsuite: * gcc.dg/debug/dwarf2/aranges-fnsec-1.c: New test. From-SVN: r127627 --- diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 6ba336c6f9f..ecfbbaa2a07 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,15 @@ +2007-08-19 Joseph Myers + + * dwarf2out.c (text_section_used, cold_text_section_used, + cold_text_section, dwarf2out_note_section_used): New. + (dwarf2out_init): Initialize cold_text_section. + (dwarf2out_switch_text_section, dwarf2out_begin_function): Call + dwarf2out_note_section_used. + (size_of_aranges): Only count entry for text section if it was + used. Count entry for cold text section if it was used. + (output_aranges): Only output entries for text section and cold + text section if they were used. + 2007-08-19 Andrew Pinski * tree-pretty-print.c (debug_generic_expr): Add a comment about diff --git a/gcc/dwarf2out.c b/gcc/dwarf2out.c index bfeb5447c79..01707371beb 100644 --- a/gcc/dwarf2out.c +++ b/gcc/dwarf2out.c @@ -4412,6 +4412,15 @@ static char ranges_section_label[2 * MAX_ARTIFICIAL_LABEL_BYTES]; #ifndef SEPARATE_LINE_CODE_LABEL #define SEPARATE_LINE_CODE_LABEL "LSM" #endif + +/* Whether the default text and cold text sections have been used at + all. */ + +static GTY(()) bool text_section_used = false; +static GTY(()) bool cold_text_section_used = false; + +/* The default cold text section. */ +static GTY(()) section *cold_text_section; /* We allow a language front-end to designate a function that is to be called to "demangle" any name before it is put into a DIE. */ @@ -6852,7 +6861,10 @@ size_of_aranges (void) size = DWARF_ARANGES_HEADER_SIZE; /* Count the address/length pair for this compilation unit. */ - size += 2 * DWARF2_ADDR_SIZE; + if (text_section_used) + size += 2 * DWARF2_ADDR_SIZE; + if (cold_text_section_used) + size += 2 * DWARF2_ADDR_SIZE; size += 2 * DWARF2_ADDR_SIZE * arange_table_in_use; /* Count the two zero words used to terminated the address range table. */ @@ -7050,6 +7062,18 @@ add_loc_descr_to_loc_list (dw_loc_list_ref *list_head, dw_loc_descr_ref descr, *d = new_loc_list (descr, begin, end, section, 0); } +/* Note that the current function section is being used for code. */ + +static void +dwarf2out_note_section_used (void) +{ + section *sec = current_function_section (); + if (sec == text_section) + text_section_used = true; + else if (sec == cold_text_section) + cold_text_section_used = true; +} + static void dwarf2out_switch_text_section (void) { @@ -7068,6 +7092,8 @@ dwarf2out_switch_text_section (void) /* Reset the current label on switching text sections, so that we don't attempt to advance_loc4 between labels in different sections. */ fde->dw_fde_current_label = NULL; + + dwarf2out_note_section_used (); } /* Output the location list given to us. */ @@ -7553,10 +7579,18 @@ output_aranges (void) dw2_asm_output_data (2, 0, NULL); } - dw2_asm_output_addr (DWARF2_ADDR_SIZE, text_section_label, "Address"); - dw2_asm_output_delta (DWARF2_ADDR_SIZE, text_end_label, - text_section_label, "Length"); - if (flag_reorder_blocks_and_partition) + /* It is necessary not to output these entries if the sections were + not used; if the sections were not used, the length will be 0 and + the address may end up as 0 if the section is discarded by ld + --gc-sections, leaving an invalid (0, 0) entry that can be + confused with the terminator. */ + if (text_section_used) + { + dw2_asm_output_addr (DWARF2_ADDR_SIZE, text_section_label, "Address"); + dw2_asm_output_delta (DWARF2_ADDR_SIZE, text_end_label, + text_section_label, "Length"); + } + if (cold_text_section_used) { dw2_asm_output_addr (DWARF2_ADDR_SIZE, cold_text_section_label, "Address"); @@ -14071,6 +14105,8 @@ dwarf2out_begin_function (tree fun) if (function_section (fun) != text_section) have_multiple_function_sections = true; + + dwarf2out_note_section_used (); } /* Output a label to mark the beginning of a source code line entry @@ -14343,7 +14379,8 @@ dwarf2out_init (const char *filename ATTRIBUTE_UNUSED) ASM_OUTPUT_LABEL (asm_out_file, text_section_label); if (flag_reorder_blocks_and_partition) { - switch_to_section (unlikely_text_section ()); + cold_text_section = unlikely_text_section (); + switch_to_section (cold_text_section); ASM_OUTPUT_LABEL (asm_out_file, cold_text_section_label); } } diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index 871df930c0e..34a5659e2ed 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,7 @@ +2007-08-19 Joseph Myers + + * gcc.dg/debug/dwarf2/aranges-fnsec-1.c: New test. + 2007-08-19 Tobias Burnus * gfortran.dg/interface_abstract_2.f90: New. diff --git a/gcc/testsuite/gcc.dg/debug/dwarf2/aranges-fnsec-1.c b/gcc/testsuite/gcc.dg/debug/dwarf2/aranges-fnsec-1.c new file mode 100644 index 00000000000..c6aada4611c --- /dev/null +++ b/gcc/testsuite/gcc.dg/debug/dwarf2/aranges-fnsec-1.c @@ -0,0 +1,12 @@ +/* Test that .debug_aranges does not have an entry for the text + section if nothing went in there. */ +/* Origin: Joseph Myers */ +/* { dg-do compile } */ +/* { dg-options "-gdwarf-2 -ffunction-sections" } */ +/* { dg-final { scan-assembler-not "\\.Letext0-\\.Ltext0" } } */ + +int +f (void) +{ + return 1; +}