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* [binutils-gdb] gdb/disasm: read opcodes bytes with a single read_code call
@ 2022-10-02 13:15 Andrew Burgess
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From: Andrew Burgess @ 2022-10-02 13:15 UTC (permalink / raw)
To: gdb-cvs
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=d309a8f9b34d8fd570dc8c7189eb6790b9afd4e3
commit d309a8f9b34d8fd570dc8c7189eb6790b9afd4e3
Author: Andrew Burgess <aburgess@redhat.com>
Date: Thu Jun 23 11:49:08 2022 +0100
gdb/disasm: read opcodes bytes with a single read_code call
This commit reduces the number of times we call read_code when
printing the instruction opcode bytes during disassembly.
I've added a new gdb::byte_vector within the
gdb_pretty_print_disassembler class, in line with all the other
buffers that gdb_pretty_print_disassembler needs. This byte_vector is
then resized as needed, and filled with a single read_code call for
each instruction.
There should be no user visible changes after this commit.
Diff:
---
gdb/disasm.c | 16 +++++++---------
gdb/disasm.h | 3 +++
2 files changed, 10 insertions(+), 9 deletions(-)
diff --git a/gdb/disasm.c b/gdb/disasm.c
index 989120e05b1..ba6ac2d4827 100644
--- a/gdb/disasm.c
+++ b/gdb/disasm.c
@@ -459,21 +459,19 @@ gdb_pretty_print_disassembler::pretty_print_insn (const struct disasm_insn *insn
if (flags & DISASSEMBLY_RAW_INSN)
{
- CORE_ADDR end_pc;
- bfd_byte data;
- const char *spacer = "";
-
/* Build the opcodes using a temporary stream so we can
write them out in a single go for the MI. */
m_opcode_stb.clear ();
- end_pc = pc + size;
+ /* Read the instruction opcode data. */
+ m_opcode_data.resize (size);
+ read_code (pc, m_opcode_data.data (), size);
- for (;pc < end_pc; ++pc)
+ for (int i = 0; i < size; ++i)
{
- read_code (pc, &data, 1);
- m_opcode_stb.printf ("%s%02x", spacer, (unsigned) data);
- spacer = " ";
+ if (i > 0)
+ m_opcode_stb.puts (" ");
+ m_opcode_stb.printf ("%02x", (unsigned) m_opcode_data[i]);
}
m_uiout->field_stream ("opcodes", m_opcode_stb);
diff --git a/gdb/disasm.h b/gdb/disasm.h
index 09cb3921767..dab6116cd00 100644
--- a/gdb/disasm.h
+++ b/gdb/disasm.h
@@ -344,6 +344,9 @@ private:
/* The buffer used to build the raw opcodes string. */
string_file m_opcode_stb;
+
+ /* The buffer used to hold the opcode bytes (if required). */
+ gdb::byte_vector m_opcode_data;
};
/* Return the length in bytes of the instruction at address MEMADDR in
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2022-10-02 13:15 [binutils-gdb] gdb/disasm: read opcodes bytes with a single read_code call Andrew Burgess
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