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objtool: Get rid of reloc->jump_table_start

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Rework the jump table logic slightly so 'jump_table_start' is no longer
needed.

With allyesconfig + CONFIG_DEBUG_INFO:

- Before: peak heap memory consumption: 40.37G
- After:  peak heap memory consumption: 38.64G

Link: https://lore.kernel.org/r/e1602ed8a6171ada3cfac0bd8449892ec82bd188.1685464332.git.jpoimboe@kernel.org
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
This commit is contained in:
Josh Poimboeuf 2023-05-30 10:21:09 -07:00
parent 0696b6e314
commit be2f0b1e12
2 changed files with 23 additions and 13 deletions
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35
tools/objtool/check.c
View file

@ -1989,13 +1989,14 @@ static int add_special_section_alts(struct objtool_file *file)
}
static int add_jump_table(struct objtool_file *file, struct instruction *insn,
struct reloc *table)
struct reloc *next_table)
{
struct reloc *reloc = table;
struct instruction *dest_insn;
struct alternative *alt;
struct symbol *pfunc = insn_func(insn)->pfunc;
struct reloc *table = insn_jump_table(insn);
struct instruction *dest_insn;
unsigned int prev_offset = 0;
struct reloc *reloc = table;
struct alternative *alt;
/*
* Each @reloc is a switch table relocation which points to the target
@ -2004,7 +2005,7 @@ static int add_jump_table(struct objtool_file *file, struct instruction *insn,
for_each_reloc_from(table->sec, reloc) {
/* Check for the end of the table: */
if (reloc != table && reloc->jump_table_start)
if (reloc != table && reloc == next_table)
break;
/* Make sure the table entries are consecutive: */
@ -2119,29 +2120,39 @@ static void mark_func_jump_tables(struct objtool_file *file,
continue;
reloc = find_jump_table(file, func, insn);
if (reloc) {
reloc->jump_table_start = true;
if (reloc)
insn->_jump_table = reloc;
}
}
}
static int add_func_jump_tables(struct objtool_file *file,
struct symbol *func)
{
struct instruction *insn;
int ret;
struct instruction *insn, *insn_t1 = NULL, *insn_t2;
int ret = 0;
func_for_each_insn(file, func, insn) {
if (!insn_jump_table(insn))
continue;
ret = add_jump_table(file, insn, insn_jump_table(insn));
if (!insn_t1) {
insn_t1 = insn;
continue;
}
insn_t2 = insn;
ret = add_jump_table(file, insn_t1, insn_jump_table(insn_t2));
if (ret)
return ret;
insn_t1 = insn_t2;
}
return 0;
if (insn_t1)
ret = add_jump_table(file, insn_t1, NULL);
return ret;
}
/*

1
tools/objtool/include/objtool/elf.h
View file

@ -75,7 +75,6 @@ struct reloc {
struct section *sec;
struct symbol *sym;
struct list_head sym_reloc_entry;
bool jump_table_start;
};
struct elf {