From 42ddae103c9eb20fb87378548ee95b4bd23648a5 Mon Sep 17 00:00:00 2001 From: Pedro Alves Date: Thu, 26 Apr 2018 13:01:26 +0100 Subject: [PATCH] Factor out minsym_found/find_function_start_sal overload I need to make the ifunc resolving code in elfread.c skip the target function's prologue like minsym_found does. I thought of factoring that out to a separate function, but turns out there's already a comment in find_function_start_sal that says that should agree with minsym_found... Instead of making sure the code agrees with a comment, factor out the common code to a separate function and use it from both places. Note that the current find_function_start_sal does a bit more than minsym_found's equivalent (the "We always should ..." bit), though that's probably a latent bug. gdb/ChangeLog: 2018-04-26 Pedro Alves * linespec.c (minsym_found): Use find_function_start_sal CORE_ADDR overload. * symtab.c (find_function_start_sal(CORE_ADDR, obj_section *,bool)): New, factored out from ... (find_function_start_sal(symbol *, int)): ... this. Reimplement and use bool. * symtab.h (find_function_start_sal(CORE_ADDR, obj_section *,bool)): New. (find_function_start_sal(symbol *, int)): Change boolean parameter type to bool. --- gdb/linespec.c | 20 +------------------- gdb/symtab.c | 45 +++++++++++++++++++++++++-------------------- gdb/symtab.h | 13 +++++++++++-- 3 files changed, 37 insertions(+), 41 deletions(-) diff --git a/gdb/linespec.c b/gdb/linespec.c index b2deabe..045c97a 100644 --- a/gdb/linespec.c +++ b/gdb/linespec.c @@ -4292,25 +4292,7 @@ minsym_found (struct linespec_state *self, struct objfile *objfile, symtab_and_line sal; if (is_function && want_start_sal) - { - sal = find_pc_sect_line (func_addr, NULL, 0); - - if (self->funfirstline) - { - if (sal.symtab != NULL - && (COMPUNIT_LOCATIONS_VALID (SYMTAB_COMPUNIT (sal.symtab)) - || SYMTAB_LANGUAGE (sal.symtab) == language_asm)) - { - struct gdbarch *gdbarch = get_objfile_arch (objfile); - - sal.pc = func_addr; - if (gdbarch_skip_entrypoint_p (gdbarch)) - sal.pc = gdbarch_skip_entrypoint (gdbarch, sal.pc); - } - else - skip_prologue_sal (&sal); - } - } + sal = find_function_start_sal (func_addr, NULL, self->funfirstline); else { sal.objfile = objfile; diff --git a/gdb/symtab.c b/gdb/symtab.c index 92b7ed7..13910c6 100644 --- a/gdb/symtab.c +++ b/gdb/symtab.c @@ -3575,46 +3575,36 @@ find_pc_line_pc_range (CORE_ADDR pc, CORE_ADDR *startptr, CORE_ADDR *endptr) return sal.symtab != 0; } -/* Given a function symbol SYM, find the symtab and line for the start - of the function. - If the argument FUNFIRSTLINE is nonzero, we want the first line - of real code inside the function. - This function should return SALs matching those from minsym_found, - otherwise false multiple-locations breakpoints could be placed. */ +/* See symtab.h. */ -struct symtab_and_line -find_function_start_sal (struct symbol *sym, int funfirstline) +symtab_and_line +find_function_start_sal (CORE_ADDR func_addr, obj_section *section, + bool funfirstline) { - fixup_symbol_section (sym, NULL); - - obj_section *section = SYMBOL_OBJ_SECTION (symbol_objfile (sym), sym); - symtab_and_line sal - = find_pc_sect_line (BLOCK_START (SYMBOL_BLOCK_VALUE (sym)), section, 0); - sal.symbol = sym; + symtab_and_line sal = find_pc_sect_line (func_addr, section, 0); if (funfirstline && sal.symtab != NULL && (COMPUNIT_LOCATIONS_VALID (SYMTAB_COMPUNIT (sal.symtab)) || SYMTAB_LANGUAGE (sal.symtab) == language_asm)) { - struct gdbarch *gdbarch = symbol_arch (sym); + struct gdbarch *gdbarch = get_objfile_arch (SYMTAB_OBJFILE (sal.symtab)); - sal.pc = BLOCK_START (SYMBOL_BLOCK_VALUE (sym)); + sal.pc = func_addr; if (gdbarch_skip_entrypoint_p (gdbarch)) sal.pc = gdbarch_skip_entrypoint (gdbarch, sal.pc); return sal; } /* We always should have a line for the function start address. - If we don't, something is odd. Create a plain SAL refering + If we don't, something is odd. Create a plain SAL referring just the PC and hope that skip_prologue_sal (if requested) can find a line number for after the prologue. */ - if (sal.pc < BLOCK_START (SYMBOL_BLOCK_VALUE (sym))) + if (sal.pc < func_addr) { sal = {}; sal.pspace = current_program_space; - sal.pc = BLOCK_START (SYMBOL_BLOCK_VALUE (sym)); + sal.pc = func_addr; sal.section = section; - sal.symbol = sym; } if (funfirstline) @@ -3623,6 +3613,21 @@ find_function_start_sal (struct symbol *sym, int funfirstline) return sal; } +/* See symtab.h. */ + +symtab_and_line +find_function_start_sal (symbol *sym, bool funfirstline) +{ + fixup_symbol_section (sym, NULL); + symtab_and_line sal + = find_function_start_sal (BLOCK_START (SYMBOL_BLOCK_VALUE (sym)), + SYMBOL_OBJ_SECTION (symbol_objfile (sym), sym), + funfirstline); + sal.symbol = sym; + return sal; +} + + /* Given a function start address FUNC_ADDR and SYMTAB, find the first address for that function that has an entry in SYMTAB's line info table. If such an entry cannot be found, return FUNC_ADDR diff --git a/gdb/symtab.h b/gdb/symtab.h index a89d597..0bd95fa 100644 --- a/gdb/symtab.h +++ b/gdb/symtab.h @@ -1899,8 +1899,17 @@ int matching_obj_sections (struct obj_section *, struct obj_section *); extern struct symtab *find_line_symtab (struct symtab *, int, int *, int *); -extern struct symtab_and_line find_function_start_sal (struct symbol *sym, - int); +/* Given a function symbol SYM, find the symtab and line for the start + of the function. If FUNFIRSTLINE is true, we want the first line + of real code inside the function. */ +extern symtab_and_line find_function_start_sal (symbol *sym, bool + funfirstline); + +/* Same, but start with a function address/section instead of a + symbol. */ +extern symtab_and_line find_function_start_sal (CORE_ADDR func_addr, + obj_section *section, + bool funfirstline); extern void skip_prologue_sal (struct symtab_and_line *); -- 2.7.4