[lldb] Fix SBTarget::ReadInstruction with flavor (#134626)

When you call the `SBTarget::ReadInstructions` with flavor from lldb
crashes. This is because the wrong order of the `DisassemblyBytes`
constructor this fixes that

---------

Signed-off-by: Ebuka Ezike <yerimyah1@gmail.com>

3 files changed, 63 insertions, 0 deletions

diff --git a/lldb/test/API/python_api/target/read-instructions-flavor/Makefile b/lldb/test/API/python_api/target/read-instructions-flavor/Makefile
new file mode 100644
index 0000000..1049594
--- /dev/null
+++ b/lldb/test/API/python_api/target/read-instructions-flavor/Makefile
@@ -0,0 +1,3 @@
+C_SOURCES := main.c
+
+include Makefile.rules
diff --git a/lldb/test/API/python_api/target/read-instructions-flavor/TestTargetReadInstructionsFlavor.py b/lldb/test/API/python_api/target/read-instructions-flavor/TestTargetReadInstructionsFlavor.py
new file mode 100644
index 0000000..40edc57d
--- /dev/null
+++ b/lldb/test/API/python_api/target/read-instructions-flavor/TestTargetReadInstructionsFlavor.py
@@ -0,0 +1,39 @@
+"""
+Test SBTarget Read Instruction.
+"""
+
+from lldbsuite.test.decorators import *
+from lldbsuite.test.lldbtest import *
+
+
+class TargetReadInstructionsFlavor(TestBase):
+    @skipIf(archs=no_match(["x86_64", "x86", "i386"]), oslist=["windows"])
+    def test_read_instructions_with_flavor(self):
+        self.build()
+        executable = self.getBuildArtifact("a.out")
+
+        # create a target
+        target = self.dbg.CreateTarget(executable)
+        self.assertTrue(target.IsValid(), "target is not valid")
+
+        functions = target.FindFunctions("test_add")
+        self.assertEqual(len(functions), 1)
+        test_add = functions[0]
+
+        test_add_symbols = test_add.GetSymbol()
+        self.assertTrue(
+            test_add_symbols.IsValid(), "test_add function symbols is not valid"
+        )
+
+        expected_instructions = (("mov", "eax, edi"), ("add", "eax, esi"), ("ret", ""))
+        test_add_insts = test_add_symbols.GetInstructions(target, "intel")
+        # clang adds an extra nop instruction but gcc does not. It makes more sense
+        # to check if it is at least 3
+        self.assertLessEqual(len(expected_instructions), len(test_add_insts))
+
+        # compares only the expected instructions
+        for expected_instr, instr in zip(expected_instructions, test_add_insts):
+            self.assertTrue(instr.IsValid(), "instruction is not valid")
+            expected_mnemonic, expected_op_str = expected_instr
+            self.assertEqual(instr.GetMnemonic(target), expected_mnemonic)
+            self.assertEqual(instr.GetOperands(target), expected_op_str)
diff --git a/lldb/test/API/python_api/target/read-instructions-flavor/main.c b/lldb/test/API/python_api/target/read-instructions-flavor/main.c
new file mode 100644
index 0000000..6022d63
--- /dev/null
+++ b/lldb/test/API/python_api/target/read-instructions-flavor/main.c
@@ -0,0 +1,21 @@
+
+// This simple program is to test the lldb Python API SBTarget ReadInstruction
+// function.
+//
+// When the target is create we get all the instructions using the intel
+// flavor and see if it is correct.
+
+int test_add(int a, int b);
+
+__asm__("test_add:\n"
+        "    movl    %edi, %eax\n"
+        "    addl    %esi, %eax\n"
+        "    ret     \n");
+
+int main(int argc, char **argv) {
+  int a = 10;
+  int b = 20;
+  int result = test_add(a, b);
+
+  return 0;
+}
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