eflags affected vs. used

git-svn-id: file:///home/svn/incoming/trunk@3362 4d416f70-5f16-0410-b530-b9f4589650da

lib/ext/disassembler/x86/dasm/dasm.c

@@ -556,6 +556,18 @@ static VALUE instruction_eflags_affected(VALUE self)
 	return INT2FIX(inst->inst.eflags_affected);
 }
 
+//
+// Returns the eflags that are used by this instruction.
+//
+static VALUE instruction_eflags_used(VALUE self)
+{
+	PINSTRUCTION_OBJECT inst;
+
+	rb_instruction_cast(self, inst);
+
+	return INT2FIX(inst->inst.eflags_used);
+}
+
 ////
 //
 // Dasm class
@@ -850,6 +862,7 @@ void Init_dasm()
 	rb_define_method(instr_klass, "op2", instruction_op2, 0);
 	rb_define_method(instr_klass, "op3", instruction_op3, 0);
 	rb_define_method(instr_klass, "eflags_affected", instruction_eflags_affected, 0);
+	rb_define_method(instr_klass, "eflags_used", instruction_eflags_used, 0);
 
 	// Operand
 	oper_klass = rb_define_class_under(dasm_klass, "Operand",

lib/ext/disassembler/x86/dasm/dasm.rb.ut.rb

@@ -45,6 +45,7 @@ class Ext::Disassembler::X86::Dasm::UnitTest < Test::Unit::TestCase
 		d.set_format("att")
 		assert_equal("inc %ecx", inst.to_s);
 		assert_equal(X86::EFL_OF | X86::EFL_SF | X86::EFL_ZF | X86::EFL_AF | X86::EFL_PF, inst.eflags_affected)
+		assert_equal(0, inst.eflags_used)
 	end
 
 	def test_operand

lib/ext/disassembler/x86/dasm/libdasm.h

@@ -293,7 +293,8 @@ typedef struct _INST {
 	int flags2;		// Second operand flags (if any)
 	int flags3;		// Additional operand flags (if any)
 	int modrm;		// Is MODRM byte present?
-	int eflags_affected;	// Processor eflags affected
+	short eflags_affected;	// Processor eflags affected
+	short eflags_used;      // Processor eflags used by this instruction
 } INST, *PINST;
 
 // Operands for the instruction
@@ -332,7 +333,8 @@ typedef struct _INSTRUCTION {
 	OPERAND op3;		// Additional operand (if any)
 	PINST ptr;		// Pointer to instruction table
 	int flags;		// Instruction flags
-	int eflags_affected;	// Process eflags affected
+	short eflags_affected;	// Process eflags affected
+	short eflags_used;      // Processor eflags used by this instruction
 } INSTRUCTION, *PINSTRUCTION;