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authorPedro Alves <palves@redhat.com>2017-02-02 11:11:47 +0000
committerPedro Alves <palves@redhat.com>2017-02-02 11:11:47 +0000
commit187808b04f61df1c38fda0921e2d9eeb53e332ee (patch)
tree3f1325c47f3c77454be41462bbc764ab78feafa8 /gdb/disasm.c
parentfd121c5c45bd2652a78c62812737874e36259e2a (diff)
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Add back gdb_pretty_print_insn
ui_file_rewind is a ui_file method that only really works with mem buffer files, and is a nop on other ui_file types. It'd be desirable to eliminate it from the base ui_file interface, and move it to the "mem_fileopen" subclass of ui_file instead. A following patch does just that. Unfortunately, there are a couple references to ui_file_rewind inside gdb_disassembler::pretty_print_insn that were made harder to eliminate with the recent addition of the gdb_disassembler wrapper. Before the gdb_disassembler wrapper was added, in commit e47ad6c0bd7aa3 ("Refactor disassembly code"), gdb_pretty_print_insn used to be passed a ui_file pointer as argument, and it was simple to adjust that pointer be a "mem_fileopen" ui_file pointer instead, since there's only one gdb_pretty_print_insn caller. That commit made gdb_pretty_print_insn be a method of gdb_disassembler, and removed the method's ui_file parameter at the same time, replaced by referencing the gdb_disassembler's stream instead. The trouble is that a gdb_disassembler can be instantiated with a pointer any kind of ui_file. Casting the gdb_disassembler's stream to a mem_fileopen ui_file inside gdb_disassembler::pretty_print_insn in order to call the reset method would be gross hack. The fix here is to: - make gdb_disassembler::pretty_print_insn a be free function again instead of a method of gdb_disassembler. I.e., bring back gdb_pretty_print_insn. - but, don't add back the ui_file * parameter. Instead, move the mem_fileopen allocation inside. That is a better interface, given that the ui_file is only ever used as temporary scratch buffer as an implementation detail of gdb_pretty_print_insn. The function's real "where to send output" parameter is the ui_out pointer. (A following patch will add back buffer reuse across invocations differently). - don't add back a disassemble_info pointer either. That used to be necessary for this bit: err = m_di.read_memory_func (pc, &data, 1, &m_di); if (err != 0) m_di.memory_error_func (err, pc, &m_di); ... but AFAIK, it's not really necessary. We can replace those three lines with a call to read_code. This seems to fix a regression even, because before commit d8b49cf0c891d0 ("Don't throw exception in dis_asm_memory_error"), that memory_error_func call would throw an error/exception, but now it only records the error in the gdb_disassembler's m_err_memaddr field. (read_code throws on error.) With all these, gdb_pretty_print_insn is completely layered on top of gdb_disassembler only using the latter's public API. gdb/ChangeLog: 2017-02-02 Pedro Alves <palves@redhat.com> * disasm.c (gdb_disassembler::pretty_print_insn): Rename to... (gdb_pretty_print_insn): ... this. Now a free function. Add back a 'gdbarch' parameter. Allocate a mem_fileopen stream here. Adjust to call gdb_print_insn instead of gdb_disassembler::print_insn. (dump_insns, do_mixed_source_and_assembly_deprecated) (do_mixed_source_and_assembly, do_assembly_only): Add back a 'gdbarch' parameter. Remove gdb_disassembler parameter. (gdb_disassembly): Don't allocate a gdb_disassembler here. * disasm.h (gdb_disassembler::pretty_print_insn): Delete declaration. (gdb_pretty_print_insn): Re-add declaration. * record-btrace.c (btrace_insn_history): Don't allocate a gdb_disassembler here. Adjust to call gdb_pretty_print_insn.
Diffstat (limited to 'gdb/disasm.c')
-rw-r--r--gdb/disasm.c54
1 files changed, 22 insertions, 32 deletions
diff --git a/gdb/disasm.c b/gdb/disasm.c
index 9d36f15..03ff8d3 100644
--- a/gdb/disasm.c
+++ b/gdb/disasm.c
@@ -182,9 +182,9 @@ compare_lines (const void *mle1p, const void *mle2p)
/* See disasm.h. */
int
-gdb_disassembler::pretty_print_insn (struct ui_out *uiout,
- const struct disasm_insn *insn,
- int flags)
+gdb_pretty_print_insn (struct gdbarch *gdbarch, struct ui_out *uiout,
+ const struct disasm_insn *insn,
+ int flags)
{
/* parts of the symbolic representation of the address */
int unmapped;
@@ -195,8 +195,6 @@ gdb_disassembler::pretty_print_insn (struct ui_out *uiout,
char *filename = NULL;
char *name = NULL;
CORE_ADDR pc;
- struct ui_file *stb = stream ();
- struct gdbarch *gdbarch = arch ();
ui_out_chain = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
pc = insn->addr;
@@ -250,7 +248,9 @@ gdb_disassembler::pretty_print_insn (struct ui_out *uiout,
if (name != NULL)
xfree (name);
- ui_file_rewind (stb);
+ struct ui_file *stb = mem_fileopen ();
+ make_cleanup_ui_file_delete (stb);
+
if (flags & DISASSEMBLY_RAW_INSN)
{
CORE_ADDR end_pc;
@@ -264,14 +264,12 @@ gdb_disassembler::pretty_print_insn (struct ui_out *uiout,
struct cleanup *cleanups =
make_cleanup_ui_file_delete (opcode_stream);
- size = print_insn (pc);
+ size = gdb_print_insn (gdbarch, pc, stb, NULL);
end_pc = pc + size;
for (;pc < end_pc; ++pc)
{
- err = m_di.read_memory_func (pc, &data, 1, &m_di);
- if (err != 0)
- m_di.memory_error_func (err, pc, &m_di);
+ read_code (pc, &data, 1);
fprintf_filtered (opcode_stream, "%s%02x",
spacer, (unsigned) data);
spacer = " ";
@@ -283,10 +281,9 @@ gdb_disassembler::pretty_print_insn (struct ui_out *uiout,
do_cleanups (cleanups);
}
else
- size = print_insn (pc);
+ size = gdb_print_insn (gdbarch, pc, stb, NULL);
uiout->field_stream ("inst", stb);
- ui_file_rewind (stb);
do_cleanups (ui_out_chain);
uiout->text ("\n");
@@ -294,10 +291,9 @@ gdb_disassembler::pretty_print_insn (struct ui_out *uiout,
}
static int
-dump_insns (struct ui_out *uiout, gdb_disassembler *di,
- CORE_ADDR low, CORE_ADDR high,
- int how_many, int flags,
- CORE_ADDR *end_pc)
+dump_insns (struct gdbarch *gdbarch,
+ struct ui_out *uiout, CORE_ADDR low, CORE_ADDR high,
+ int how_many, int flags, CORE_ADDR *end_pc)
{
struct disasm_insn insn;
int num_displayed = 0;
@@ -309,7 +305,7 @@ dump_insns (struct ui_out *uiout, gdb_disassembler *di,
{
int size;
- size = di->pretty_print_insn (uiout, &insn, flags);
+ size = gdb_pretty_print_insn (gdbarch, uiout, &insn, flags);
if (size <= 0)
break;
@@ -335,8 +331,8 @@ dump_insns (struct ui_out *uiout, gdb_disassembler *di,
static void
do_mixed_source_and_assembly_deprecated
- (struct ui_out *uiout,
- gdb_disassembler *di, struct symtab *symtab,
+ (struct gdbarch *gdbarch, struct ui_out *uiout,
+ struct symtab *symtab,
CORE_ADDR low, CORE_ADDR high,
int how_many, int flags)
{
@@ -471,7 +467,7 @@ do_mixed_source_and_assembly_deprecated
= make_cleanup_ui_out_list_begin_end (uiout, "line_asm_insn");
}
- num_displayed += dump_insns (uiout, di,
+ num_displayed += dump_insns (gdbarch, uiout,
mle[i].start_pc, mle[i].end_pc,
how_many, flags, NULL);
@@ -499,7 +495,6 @@ do_mixed_source_and_assembly_deprecated
static void
do_mixed_source_and_assembly (struct gdbarch *gdbarch,
struct ui_out *uiout,
- gdb_disassembler *di,
struct symtab *main_symtab,
CORE_ADDR low, CORE_ADDR high,
int how_many, int flags)
@@ -721,7 +716,7 @@ do_mixed_source_and_assembly (struct gdbarch *gdbarch,
end_pc = std::min (sal.end, high);
else
end_pc = pc + 1;
- num_displayed += dump_insns (uiout, di, pc, end_pc,
+ num_displayed += dump_insns (gdbarch, uiout, pc, end_pc,
how_many, flags, &end_pc);
pc = end_pc;
@@ -736,8 +731,7 @@ do_mixed_source_and_assembly (struct gdbarch *gdbarch,
}
static void
-do_assembly_only (struct ui_out *uiout,
- gdb_disassembler *di,
+do_assembly_only (struct gdbarch *gdbarch, struct ui_out *uiout,
CORE_ADDR low, CORE_ADDR high,
int how_many, int flags)
{
@@ -745,7 +739,7 @@ do_assembly_only (struct ui_out *uiout,
ui_out_chain = make_cleanup_ui_out_list_begin_end (uiout, "asm_insns");
- dump_insns (uiout, di, low, high, how_many, flags, NULL);
+ dump_insns (gdbarch, uiout, low, high, how_many, flags, NULL);
do_cleanups (ui_out_chain);
}
@@ -818,9 +812,6 @@ gdb_disassembly (struct gdbarch *gdbarch, struct ui_out *uiout,
int flags, int how_many,
CORE_ADDR low, CORE_ADDR high)
{
- struct ui_file *stb = mem_fileopen ();
- struct cleanup *cleanups = make_cleanup_ui_file_delete (stb);
- gdb_disassembler di (gdbarch, stb);
struct symtab *symtab;
int nlines = -1;
@@ -832,17 +823,16 @@ gdb_disassembly (struct gdbarch *gdbarch, struct ui_out *uiout,
if (!(flags & (DISASSEMBLY_SOURCE_DEPRECATED | DISASSEMBLY_SOURCE))
|| nlines <= 0)
- do_assembly_only (uiout, &di, low, high, how_many, flags);
+ do_assembly_only (gdbarch, uiout, low, high, how_many, flags);
else if (flags & DISASSEMBLY_SOURCE)
- do_mixed_source_and_assembly (gdbarch, uiout, &di, symtab, low, high,
+ do_mixed_source_and_assembly (gdbarch, uiout, symtab, low, high,
how_many, flags);
else if (flags & DISASSEMBLY_SOURCE_DEPRECATED)
- do_mixed_source_and_assembly_deprecated (uiout, &di, symtab,
+ do_mixed_source_and_assembly_deprecated (gdbarch, uiout, symtab,
low, high, how_many, flags);
- do_cleanups (cleanups);
gdb_flush (gdb_stdout);
}