diff options
Diffstat (limited to 'Doc/lib/libdis.tex')
-rw-r--r-- | Doc/lib/libdis.tex | 351 |
1 files changed, 176 insertions, 175 deletions
diff --git a/Doc/lib/libdis.tex b/Doc/lib/libdis.tex index 959c80f..1fc6361 100644 --- a/Doc/lib/libdis.tex +++ b/Doc/lib/libdis.tex @@ -7,7 +7,7 @@ The \code{dis} module supports the analysis of Python byte code by disassembling it. Since there is no Python assembler, this module defines the Python assembly language. The Python byte code which this module takes as an input is defined in the file -\code{Include/opcode.h} and used by the compiler and the interpreter. +\file{Include/opcode.h} and used by the compiler and the interpreter. Example: Given the function myfunc @@ -16,7 +16,7 @@ def myfunc(alist): return len(alist) \end{verbatim}\ecode -the following command can be used to get the disassembly of myfunc: +the following command can be used to get the disassembly of \code{myfunc()}: \begin{verbatim} >>> dis.dis(myfunc) @@ -123,384 +123,385 @@ instructions. \renewcommand{\indexsubitem}{(byte code insns)} -\begin{funcdesc}{STOP_CODE}{} +\begin{opcodedesc}{STOP_CODE}{} Indicates end-of-code to the compiler, not used by the interpreter. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{POP_TOP}{} +\begin{opcodedesc}{POP_TOP}{} Removes the top-of-stack (TOS) item. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{ROT_TWO}{} +\begin{opcodedesc}{ROT_TWO}{} Swaps the two top-most stack items. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{ROT_THREE}{} -Lifts second and third stack item on position up, moves top down +\begin{opcodedesc}{ROT_THREE}{} +Lifts second and third stack item one position up, moves top down to position three. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{DUP_TOP}{} +\begin{opcodedesc}{DUP_TOP}{} Duplicates the reference on top of the stack. -\end{funcdesc} +\end{opcodedesc} Unary Operations take the top of the stack, apply the operation, and push the result back on the stack. -\begin{funcdesc}{UNARY_POSITIVE}{} +\begin{opcodedesc}{UNARY_POSITIVE}{} Implements \code{TOS = +TOS}. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{UNARY_NEG}{} +\begin{opcodedesc}{UNARY_NEG}{} Implements \code{TOS = -TOS}. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{UNARY_NOT}{} +\begin{opcodedesc}{UNARY_NOT}{} Implements \code{TOS = not TOS}. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{UNARY_CONVERT}{} +\begin{opcodedesc}{UNARY_CONVERT}{} Implements \code{TOS = `TOS`}. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{UNARY_INVERT}{} +\begin{opcodedesc}{UNARY_INVERT}{} Implements \code{TOS = ~TOS}. -\end{funcdesc} +\end{opcodedesc} Binary operations remove the top of the stack (TOS) and the second top-most stack item (TOS1) from the stack. They perform the operation, and put the result back on the stack. -\begin{funcdesc}{BINARY_POWER}{} +\begin{opcodedesc}{BINARY_POWER}{} Implements \code{TOS = TOS1 ** TOS}. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{BINARY_MULTIPLY}{} +\begin{opcodedesc}{BINARY_MULTIPLY}{} Implements \code{TOS = TOS1 * TOS}. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{BINARY_DIVIDE}{} +\begin{opcodedesc}{BINARY_DIVIDE}{} Implements \code{TOS = TOS1 / TOS}. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{BINARY_MODULO}{} +\begin{opcodedesc}{BINARY_MODULO}{} Implements \code{TOS = TOS1 \% TOS}. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{BINARY_ADD}{} +\begin{opcodedesc}{BINARY_ADD}{} Implements \code{TOS = TOS1 + TOS}. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{BINARY_SUBTRACT}{} +\begin{opcodedesc}{BINARY_SUBTRACT}{} Implements \code{TOS = TOS1 - TOS}. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{BINARY_SUBSCR}{} +\begin{opcodedesc}{BINARY_SUBSCR}{} Implements \code{TOS = TOS1[TOS] }. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{BINARY_LSHIFT}{} +\begin{opcodedesc}{BINARY_LSHIFT}{} Implements \code{TOS = TOS1 << TOS }. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{BINARY_RSHIFT}{} +\begin{opcodedesc}{BINARY_RSHIFT}{} Implements \code{TOS = TOS1 << TOS }. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{BINARY_AND}{} +\begin{opcodedesc}{BINARY_AND}{} Implements \code{TOS = TOS1 and TOS }. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{BINARY_XOR}{} +\begin{opcodedesc}{BINARY_XOR}{} Implements \code{TOS = TOS1 \^{ }TOS }. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{BINARY_OR}{} +\begin{opcodedesc}{BINARY_OR}{} Implements \code{TOS = TOS1 or TOS }. -\end{funcdesc} +\end{opcodedesc} The slice opcodes take up to three parameters. -\begin{funcdesc}{SLICE+0}{} +\begin{opcodedesc}{SLICE+0}{} Implements \code{TOS = TOS[:]}. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{SLICE+1}{} +\begin{opcodedesc}{SLICE+1}{} Implements \code{TOS = TOS1[TOS:]}. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{SLICE+2}{} +\begin{opcodedesc}{SLICE+2}{} Implements \code{TOS = TOS1[:TOS1]}. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{SLICE+3}{} +\begin{opcodedesc}{SLICE+3}{} Implements \code{TOS = TOS2[TOS1:TOS]}. -\end{funcdesc} +\end{opcodedesc} Slice assignment needs even an additional parameter. As any statement, they put nothing on the stack. -\begin{funcdesc}{STORE_SLICE+0}{} +\begin{opcodedesc}{STORE_SLICE+0}{} Implements \code{TOS[:]=TOS1}. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{STORE_SLICE+1}{} +\begin{opcodedesc}{STORE_SLICE+1}{} Implements \code{TOS1[TOS:]=TOS2}. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{STORE_SLICE+2}{} +\begin{opcodedesc}{STORE_SLICE+2}{} Implements \code{TOS1[:TOS]=TOS2}. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{STORE_SLICE+3}{} +\begin{opcodedesc}{STORE_SLICE+3}{} Implements \code{TOS2[TOS1:TOS]=TOS3}. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{DELETE_SLICE+0}{} +\begin{opcodedesc}{DELETE_SLICE+0}{} Implements \code{del TOS[:]}. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{DELETE_SLICE+1}{} +\begin{opcodedesc}{DELETE_SLICE+1}{} Implements \code{del TOS1[TOS:]}. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{DELETE_SLICE+2}{} +\begin{opcodedesc}{DELETE_SLICE+2}{} Implements \code{del TOS1[:TOS]}. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{DELETE_SLICE+3}{} +\begin{opcodedesc}{DELETE_SLICE+3}{} Implements \code{del TOS2[TOS1:TOS]}. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{STORE_SUBSCR}{} +\begin{opcodedesc}{STORE_SUBSCR}{} Implements \code{TOS1[TOS]=TOS2}. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{DELETE_SUBSCR}{} +\begin{opcodedesc}{DELETE_SUBSCR}{} Implements \code{del TOS1[TOS]}. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{PRINT_EXPR}{} +\begin{opcodedesc}{PRINT_EXPR}{} Implements the expression statement for the interactive mode. TOS is removed from the stack and printed. In non-interactive mode, an -expression statement is terminated with POP_STACK. -\end{funcdesc} +expression statement is terminated with \code{POP_STACK}. +\end{opcodedesc} -\begin{funcdesc}{PRINT_ITEM}{} +\begin{opcodedesc}{PRINT_ITEM}{} Prints TOS. There is one such instruction for each item in the print statement. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{PRINT_NEWLINE}{} +\begin{opcodedesc}{PRINT_NEWLINE}{} Prints a new line on \code{sys.stdout}. This is generated as the last operation of a print statement, unless the statement ends with a comma. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{BREAK_LOOP}{} +\begin{opcodedesc}{BREAK_LOOP}{} Terminates a loop due to a break statement. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{LOAD_LOCALS}{} +\begin{opcodedesc}{LOAD_LOCALS}{} Pushes a reference to the locals of the current scope on the stack. This is used in the code for a class definition: After the class body is evaluated, the locals are passed to the class definition. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{RETURN_VALUE}{} +\begin{opcodedesc}{RETURN_VALUE}{} Returns with TOS to the caller of the function. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{EXEC_STMT}{} +\begin{opcodedesc}{EXEC_STMT}{} Implements \code{exec TOS2,TOS1,TOS}. The compiler fills missing optional parameters with None. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{POP_BLOCK}{} +\begin{opcodedesc}{POP_BLOCK}{} Removes one block from the block stack. Per frame, there is a stack of blocks, denoting nested loops, try statements, and such. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{END_FINALLY}{} +\begin{opcodedesc}{END_FINALLY}{} Terminates a finally-block. The interpreter recalls whether the exception has to be re-raised, or whether the function returns, and continues with the outer-next block. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{BUILD_CLASS}{} +\begin{opcodedesc}{BUILD_CLASS}{} Creates a new class object. TOS is the methods dictionary, TOS1 the tuple of the names of the base classes, and TOS2 the class name. -\end{funcdesc} +\end{opcodedesc} All of the following opcodes expect arguments. An argument is two bytes, with the more significant byte last. -\begin{funcdesc}{STORE_NAME}{namei} +\begin{opcodedesc}{STORE_NAME}{namei} Implements \code{name = TOS}. \var{namei} is the index of \var{name} in the attribute \code{co_names} of the code object. -The compiler tries to use STORE_LOCAL or STORE_GLOBAL if possible. -\end{funcdesc} +The compiler tries to use \code{STORE_LOCAL} or \code{STORE_GLOBAL} +if possible. +\end{opcodedesc} -\begin{funcdesc}{DELETE_NAME}{namei} +\begin{opcodedesc}{DELETE_NAME}{namei} Implements \code{del name}, where \var{namei} is the index into \code{co_names} attribute of the code object. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{UNPACK_TUPLE}{count} +\begin{opcodedesc}{UNPACK_TUPLE}{count} Unpacks TOS into \var{count} individual values, which are put onto the stack right-to-left. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{UNPACK_LIST}{count} +\begin{opcodedesc}{UNPACK_LIST}{count} Unpacks TOS into \var{count} individual values. -\end{funcdesc} +\end{opcodedesc} -%\begin{funcdesc}{UNPACK_ARG}{count} +%\begin{opcodedesc}{UNPACK_ARG}{count} %This opcode is obsolete. -%\end{funcdesc} +%\end{opcodedesc} -\begin{funcdesc}{STORE_ATTR}{namei} +\begin{opcodedesc}{STORE_ATTR}{namei} Implements \code{TOS.name = TOS1}, where \var{namei} is the index of name in \code{co_names}. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{DELETE_ATTR}{namei} +\begin{opcodedesc}{DELETE_ATTR}{namei} Implements \code{del TOS.name}, using \var{namei} as index into \code{co_names}. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{STORE_GLOBAL}{namei} -Works as STORE_NAME, but stores the name as a global. -\end{funcdesc} +\begin{opcodedesc}{STORE_GLOBAL}{namei} +Works as \code{STORE_NAME}, but stores the name as a global. +\end{opcodedesc} -\begin{funcdesc}{DELETE_GLOBAL}{namei} -Works as DELETE_NAME, but deletes a global name. -\end{funcdesc} +\begin{opcodedesc}{DELETE_GLOBAL}{namei} +Works as \code{DELETE_NAME}, but deletes a global name. +\end{opcodedesc} -%\begin{funcdesc}{UNPACK_VARARG}{argc} +%\begin{opcodedesc}{UNPACK_VARARG}{argc} %This opcode is obsolete. -%\end{funcdesc} +%\end{opcodedesc} -\begin{funcdesc}{LOAD_CONST}{consti} +\begin{opcodedesc}{LOAD_CONST}{consti} Pushes \code{co_consts[consti]} onto the stack. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{LOAD_NAME}{namei} +\begin{opcodedesc}{LOAD_NAME}{namei} Pushes the value associated with \code{co_names[namei]} onto the stack. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{BUILD_TUPLE}{count} +\begin{opcodedesc}{BUILD_TUPLE}{count} Creates a tuple consuming \var{count} items from the stack, and pushes the resulting tuple onto the stack. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{BUILD_LIST}{count} +\begin{opcodedesc}{BUILD_LIST}{count} Works as \code{BUILD_TUPLE}, but creates a list. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{BUILD_MAP}{zero} +\begin{opcodedesc}{BUILD_MAP}{zero} Pushes an empty dictionary object onto the stack. The argument is ignored and set to zero by the compiler. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{LOAD_ATTR}{namei} +\begin{opcodedesc}{LOAD_ATTR}{namei} Replaces TOS with \code{getattr(TOS,co_names[namei]}. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{COMPARE_OP}{opname} +\begin{opcodedesc}{COMPARE_OP}{opname} Performs a boolean operation. The operation name can be found in \code{cmp_op[opname]}. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{IMPORT_NAME}{namei} +\begin{opcodedesc}{IMPORT_NAME}{namei} Imports the module \code{co_names[namei]}. The module object is pushed onto the stack. The current name space is not affect: for a proper import statement, a subsequent \code{STORE_FAST} instruction modifies the name space. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{IMPORT_FROM}{namei} +\begin{opcodedesc}{IMPORT_FROM}{namei} Imports the attribute \code{co_names[namei]}. The module to import from is found in TOS and left there. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{JUMP_FORWARD}{delta} +\begin{opcodedesc}{JUMP_FORWARD}{delta} Increments byte code counter by \var{delta}. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{JUMP_IF_TRUE}{delta} +\begin{opcodedesc}{JUMP_IF_TRUE}{delta} If TOS is true, increment the byte code counter by \var{delta}. TOS is left on the stack. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{JUMP_IF_FALSE}{delta} +\begin{opcodedesc}{JUMP_IF_FALSE}{delta} If TOS is false, increment the byte code counter by \var{delta}. TOS is not changed. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{JUMP_ABSOLUTE}{target} +\begin{opcodedesc}{JUMP_ABSOLUTE}{target} Set byte code counter to \var{target}. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{FOR_LOOP}{delta} +\begin{opcodedesc}{FOR_LOOP}{delta} Iterate over a sequence. TOS is the current index, TOS1 the sequence. First, the next element is computed. If the sequence is exhausted, increment byte code counter by \var{delta}. Otherwise, push the sequence, the incremented counter, and the current item onto the stack. -\end{funcdesc} +\end{opcodedesc} -%\begin{funcdesc}{LOAD_LOCAL}{namei} +%\begin{opcodedesc}{LOAD_LOCAL}{namei} %This opcode is obsolete. -%\end{funcdesc} +%\end{opcodedesc} -\begin{funcdesc}{LOAD_GLOBAL}{namei} +\begin{opcodedesc}{LOAD_GLOBAL}{namei} Loads the global named \code{co_names[namei]} onto the stack. -\end{funcdesc} +\end{opcodedesc} -%\begin{funcdesc}{SET_FUNC_ARGS}{argc} +%\begin{opcodedesc}{SET_FUNC_ARGS}{argc} %This opcode is obsolete. -%\end{funcdesc} +%\end{opcodedesc} -\begin{funcdesc}{SETUP_LOOP}{delta} +\begin{opcodedesc}{SETUP_LOOP}{delta} Pushes a block for a loop onto the block stack. The block spans from the current instruction with a size of \var{delta} bytes. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{SETUP_EXCEPT}{delta} +\begin{opcodedesc}{SETUP_EXCEPT}{delta} Pushes a try block from a try-except clause onto the block stack. \var{delta} points to the first except block. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{SETUP_FINALLY}{delta} +\begin{opcodedesc}{SETUP_FINALLY}{delta} Pushes a try block from a try-except clause onto the block stack. \var{delta} points to the finally block. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{LOAD_FAST}{var_num} +\begin{opcodedesc}{LOAD_FAST}{var_num} Pushes a reference to the local \code{co_varnames[var_num]} onto the stack. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{STORE_FAST}{var_num} +\begin{opcodedesc}{STORE_FAST}{var_num} Stores TOS into the local \code{co_varnames[var_num]}. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{DELETE_FAST}{var_num} +\begin{opcodedesc}{DELETE_FAST}{var_num} Deletes local \code{co_varnames[var_num]}. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{SET_LINE_NO}{lineno} +\begin{opcodedesc}{SET_LINE_NO}{lineno} Sets the current line number to \var{lineno}. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{RAISE_VARARGS}{argc} +\begin{opcodedesc}{RAISE_VARARGS}{argc} Raises an exception. \var{argc} indicates the number of parameters to the raise statement, ranging from 1 to 3. The handler will find the traceback as TOS2, the parameter as TOS1, and the exception as TOS. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{CALL_FUNCTION}{argc} +\begin{opcodedesc}{CALL_FUNCTION}{argc} Calls a function. The low byte of \var{argc} indicates the number of positional parameters, the high byte the number of keyword parameters. On the stack, the opcode finds the keyword parameters first. For each @@ -508,17 +509,17 @@ keyword argument, the value is on top of the key. Below the keyword parameters, the positional parameters are on the stack, with the right-most parameter on top. Below the parameters, the function object to call is on the stack. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{MAKE_FUNCTION}{argc} +\begin{opcodedesc}{MAKE_FUNCTION}{argc} Pushes a new function object on the stack. TOS is the code associated with the function. The function object is defined to have \var{argc} default parameters, which are found below TOS. -\end{funcdesc} +\end{opcodedesc} -\begin{funcdesc}{BUILD_SLICE}{argc} +\begin{opcodedesc}{BUILD_SLICE}{argc} Pushes a slice object on the stack. If \var{argc} is three, creates \code{TOS3[TOS2:TOS1:TOS]}. Otherwise, expects three arguments. -\end{funcdesc} +\end{opcodedesc} |