py/emit: Suppress unreachable bytecode/native code that follows jump.
This new logic tracks when an unconditional jump/raise occurs in the
emitted code stream (bytecode or native machine code) and suppresses all
subsequent code, until a label is assigned. This eliminates a lot of
cases of dead code, with relatively simple logic.
This commit combined with the previous one (that removed the existing
dead-code finding logic) has the following code size change:
bare-arm: -16 -0.028%
minimal x86: -60 -0.036%
unix x64: -368 -0.070%
unix nanbox: -80 -0.017%
stm32: -204 -0.052% PYBV10
cc3200: +0 +0.000%
esp8266: -232 -0.033% GENERIC
esp32: -224 -0.015% GENERIC[incl -40(data)]
mimxrt: -192 -0.054% TEENSY40
renesas-ra: -200 -0.032% RA6M2_EK
nrf: +28 +0.015% pca10040
rp2: -256 -0.050% PICO
samd: -12 -0.009% ADAFRUIT_ITSYBITSY_M4_EXPRESS
Signed-off-by: Damien George <damien@micropython.org>
This commit is contained in:
Damien George
parent
e85a096302
commit
a506335524
10
py/asmbase.c
10
py/asmbase.c
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@ -55,15 +55,20 @@ void mp_asm_base_start_pass(mp_asm_base_t *as, int pass) {
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assert(as->code_base != NULL);
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}
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as->pass = pass;
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as->suppress = false;
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as->code_offset = 0;
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}
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// all functions must go through this one to emit bytes
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// if as->pass < MP_ASM_PASS_EMIT, then this function just counts the number
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// of bytes needed and returns NULL, and callers should not store any data
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// It also returns NULL if generated code should be suppressed at this point.
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uint8_t *mp_asm_base_get_cur_to_write_bytes(void *as_in, size_t num_bytes_to_write) {
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mp_asm_base_t *as = as_in;
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uint8_t *c = NULL;
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if (as->suppress) {
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return c;
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}
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if (as->pass == MP_ASM_PASS_EMIT) {
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assert(as->code_offset + num_bytes_to_write <= as->code_size);
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c = as->code_base + as->code_offset;
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@ -74,6 +79,11 @@ uint8_t *mp_asm_base_get_cur_to_write_bytes(void *as_in, size_t num_bytes_to_wri
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void mp_asm_base_label_assign(mp_asm_base_t *as, size_t label) {
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assert(label < as->max_num_labels);
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// Assiging a label ends any dead-code region, and all following machine
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// code should be emitted (until another mp_asm_base_suppress_code() call).
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as->suppress = false;
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if (as->pass < MP_ASM_PASS_EMIT) {
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// assign label offset
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assert(as->label_offsets[label] == (size_t)-1);
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11
py/asmbase.h
11
py/asmbase.h
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@ -33,7 +33,12 @@
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#define MP_ASM_PASS_EMIT (2)
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typedef struct _mp_asm_base_t {
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int pass;
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uint8_t pass;
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// Set to true using mp_asm_base_suppress_code() if the code generator
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// should suppress emitted code due to it being dead code.
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bool suppress;
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size_t code_offset;
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size_t code_size;
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uint8_t *code_base;
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@ -50,6 +55,10 @@ void mp_asm_base_label_assign(mp_asm_base_t *as, size_t label);
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void mp_asm_base_align(mp_asm_base_t *as, unsigned int align);
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void mp_asm_base_data(mp_asm_base_t *as, unsigned int bytesize, uintptr_t val);
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static inline void mp_asm_base_suppress_code(mp_asm_base_t *as) {
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as->suppress = true;
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}
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static inline size_t mp_asm_base_get_code_pos(mp_asm_base_t *as) {
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return as->code_offset;
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}
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22
py/emitbc.c
22
py/emitbc.c
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@ -48,6 +48,11 @@ struct _emit_t {
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pass_kind_t pass : 8;
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// Set to true if the code generator should suppress emitted code due to it
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// being dead code. This can happen when opcodes immediately follow an
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// unconditional flow control (eg jump or raise).
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bool suppress;
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int stack_size;
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mp_emit_common_t *emit_common;
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@ -140,6 +145,9 @@ STATIC void emit_write_code_info_bytes_lines(emit_t *emit, mp_uint_t bytes_to_sk
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// all functions must go through this one to emit byte code
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STATIC uint8_t *emit_get_cur_to_write_bytecode(void *emit_in, size_t num_bytes_to_write) {
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emit_t *emit = emit_in;
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if (emit->suppress) {
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return emit->dummy_data;
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}
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if (emit->pass < MP_PASS_EMIT) {
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emit->bytecode_offset += num_bytes_to_write;
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return emit->dummy_data;
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@ -222,6 +230,10 @@ STATIC void emit_write_bytecode_byte_child(emit_t *emit, int stack_adj, byte b,
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STATIC void emit_write_bytecode_byte_label(emit_t *emit, int stack_adj, byte b1, mp_uint_t label) {
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mp_emit_bc_adjust_stack_size(emit, stack_adj);
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if (emit->suppress) {
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return;
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}
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// Determine if the jump offset is signed or unsigned, based on the opcode.
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const bool is_signed = b1 <= MP_BC_POP_JUMP_IF_FALSE;
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@ -271,6 +283,7 @@ STATIC void emit_write_bytecode_byte_label(emit_t *emit, int stack_adj, byte b1,
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void mp_emit_bc_start_pass(emit_t *emit, pass_kind_t pass, scope_t *scope) {
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emit->pass = pass;
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emit->stack_size = 0;
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emit->suppress = false;
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emit->scope = scope;
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emit->last_source_line_offset = 0;
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emit->last_source_line = 1;
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@ -426,6 +439,10 @@ void mp_emit_bc_set_source_line(emit_t *emit, mp_uint_t source_line) {
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}
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void mp_emit_bc_label_assign(emit_t *emit, mp_uint_t l) {
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// Assiging a label ends any dead-code region, and all following opcodes
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// should be emitted (until another unconditional flow control).
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emit->suppress = false;
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mp_emit_bc_adjust_stack_size(emit, 0);
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if (emit->pass == MP_PASS_SCOPE) {
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return;
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@ -589,6 +606,7 @@ void mp_emit_bc_rot_three(emit_t *emit) {
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void mp_emit_bc_jump(emit_t *emit, mp_uint_t label) {
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emit_write_bytecode_byte_label(emit, 0, MP_BC_JUMP, label);
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emit->suppress = true;
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}
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void mp_emit_bc_pop_jump_if(emit_t *emit, bool cond, mp_uint_t label) {
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@ -622,6 +640,7 @@ void mp_emit_bc_unwind_jump(emit_t *emit, mp_uint_t label, mp_uint_t except_dept
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emit_write_bytecode_byte_label(emit, 0, MP_BC_UNWIND_JUMP, label & ~MP_EMIT_BREAK_FROM_FOR);
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emit_write_bytecode_raw_byte(emit, ((label & MP_EMIT_BREAK_FROM_FOR) ? 0x80 : 0) | except_depth);
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}
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emit->suppress = true;
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}
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void mp_emit_bc_setup_block(emit_t *emit, mp_uint_t label, int kind) {
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@ -663,6 +682,7 @@ void mp_emit_bc_for_iter_end(emit_t *emit) {
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void mp_emit_bc_pop_except_jump(emit_t *emit, mp_uint_t label, bool within_exc_handler) {
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(void)within_exc_handler;
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emit_write_bytecode_byte_label(emit, 0, MP_BC_POP_EXCEPT_JUMP, label);
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emit->suppress = true;
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}
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void mp_emit_bc_unary_op(emit_t *emit, mp_unary_op_t op) {
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@ -766,6 +786,7 @@ void mp_emit_bc_call_method(emit_t *emit, mp_uint_t n_positional, mp_uint_t n_ke
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void mp_emit_bc_return_value(emit_t *emit) {
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emit_write_bytecode_byte(emit, -1, MP_BC_RETURN_VALUE);
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emit->suppress = true;
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}
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void mp_emit_bc_raise_varargs(emit_t *emit, mp_uint_t n_args) {
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@ -773,6 +794,7 @@ void mp_emit_bc_raise_varargs(emit_t *emit, mp_uint_t n_args) {
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MP_STATIC_ASSERT(MP_BC_RAISE_LAST + 2 == MP_BC_RAISE_FROM);
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assert(n_args <= 2);
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emit_write_bytecode_byte(emit, -n_args, MP_BC_RAISE_LAST + n_args);
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emit->suppress = true;
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}
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void mp_emit_bc_yield(emit_t *emit, int kind) {
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@ -1966,6 +1966,7 @@ STATIC void emit_native_jump(emit_t *emit, mp_uint_t label) {
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need_stack_settled(emit);
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ASM_JUMP(emit->as, label);
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emit_post(emit);
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mp_asm_base_suppress_code(&emit->as->base);
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}
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STATIC void emit_native_jump_helper(emit_t *emit, bool cond, mp_uint_t label, bool pop) {
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@ -2810,6 +2811,7 @@ STATIC void emit_native_raise_varargs(emit_t *emit, mp_uint_t n_args) {
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}
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// TODO probably make this 1 call to the runtime (which could even call convert, native_raise(obj, type))
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emit_call(emit, MP_F_NATIVE_RAISE);
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mp_asm_base_suppress_code(&emit->as->base);
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}
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STATIC void emit_native_yield(emit_t *emit, int kind) {
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@ -119,12 +119,12 @@ def f():
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#from sys import * # tested at module scope
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# raise
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raise
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raise 1
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if a: raise
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if a: raise 1
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# return
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return
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return 1
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if a: return
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if a: return 1
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# function with lots of locals
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def f():
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@ -47,8 +47,8 @@ arg names:
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42 IMPORT_STAR
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43 LOAD_CONST_NONE
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44 RETURN_VALUE
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File cmdline/cmd_showbc.py, code block 'f' (descriptor: \.\+, bytecode @\.\+ 45\[46\] bytes)
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Raw bytecode (code_info_size=8\[46\], bytecode_size=372):
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File cmdline/cmd_showbc.py, code block 'f' (descriptor: \.\+, bytecode @\.\+ 46\[68\] bytes)
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Raw bytecode (code_info_size=8\[46\], bytecode_size=382):
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a8 12 9\[bf\] 03 05 60 60 26 22 24 64 22 24 25 25 24
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26 23 63 22 22 25 23 23 2f 6c 25 65 25 25 69 68
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26 65 27 6a 62 20 23 62 2a 29 69 24 25 28 67 26
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@ -126,19 +126,18 @@ arg names:
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bc=313 line=100
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bc=315 line=101
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########
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bc=321 line=103
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bc=327 line=106
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bc=331 line=107
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bc=337 line=110
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bc=340 line=111
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bc=346 line=114
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bc=346 line=117
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bc=351 line=118
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bc=363 line=121
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bc=363 line=122
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bc=364 line=123
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bc=366 line=126
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bc=368 line=127
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bc=325 line=106
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bc=329 line=107
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bc=335 line=110
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bc=338 line=111
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bc=344 line=114
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bc=344 line=117
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bc=349 line=118
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bc=361 line=121
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bc=361 line=122
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bc=365 line=123
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bc=370 line=126
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bc=375 line=127
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00 LOAD_CONST_NONE
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01 LOAD_CONST_FALSE
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02 BINARY_OP 27 __add__
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@ -363,48 +362,55 @@ arg names:
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308 LOAD_FAST 1
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309 POP_TOP
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310 END_FINALLY
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311 JUMP 324
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313 SETUP_EXCEPT 320
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315 UNWIND_JUMP 327 1
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318 POP_EXCEPT_JUMP 324
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320 POP_TOP
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321 POP_EXCEPT_JUMP 324
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323 END_FINALLY
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324 LOAD_FAST 0
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325 POP_JUMP_IF_TRUE 313
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327 LOAD_FAST 0
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328 SETUP_WITH 335
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330 POP_TOP
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331 LOAD_DEREF 14
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333 POP_TOP
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334 LOAD_CONST_NONE
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335 WITH_CLEANUP
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336 END_FINALLY
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337 LOAD_CONST_SMALL_INT 1
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338 STORE_DEREF 16
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340 LOAD_FAST_N 16
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342 MAKE_CLOSURE \.\+ 1
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345 STORE_FAST 13
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346 LOAD_CONST_SMALL_INT 0
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347 LOAD_CONST_NONE
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348 IMPORT_NAME 'a'
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350 STORE_FAST 0
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351 LOAD_CONST_SMALL_INT 0
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352 LOAD_CONST_STRING 'b'
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354 BUILD_TUPLE 1
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356 IMPORT_NAME 'a'
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358 IMPORT_FROM 'b'
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360 STORE_DEREF 14
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362 POP_TOP
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363 RAISE_LAST
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364 LOAD_CONST_SMALL_INT 1
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365 RAISE_OBJ
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366 LOAD_CONST_NONE
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367 RETURN_VALUE
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311 JUMP 322
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313 SETUP_EXCEPT 318
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315 UNWIND_JUMP 325 1
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318 POP_TOP
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319 POP_EXCEPT_JUMP 322
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321 END_FINALLY
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322 LOAD_FAST 0
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323 POP_JUMP_IF_TRUE 313
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325 LOAD_FAST 0
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326 SETUP_WITH 333
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328 POP_TOP
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329 LOAD_DEREF 14
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331 POP_TOP
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332 LOAD_CONST_NONE
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333 WITH_CLEANUP
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334 END_FINALLY
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335 LOAD_CONST_SMALL_INT 1
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336 STORE_DEREF 16
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338 LOAD_FAST_N 16
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340 MAKE_CLOSURE \.\+ 1
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343 STORE_FAST 13
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344 LOAD_CONST_SMALL_INT 0
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345 LOAD_CONST_NONE
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346 IMPORT_NAME 'a'
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348 STORE_FAST 0
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349 LOAD_CONST_SMALL_INT 0
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350 LOAD_CONST_STRING 'b'
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352 BUILD_TUPLE 1
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354 IMPORT_NAME 'a'
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356 IMPORT_FROM 'b'
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358 STORE_DEREF 14
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360 POP_TOP
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361 LOAD_FAST 0
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362 POP_JUMP_IF_FALSE 365
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364 RAISE_LAST
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365 LOAD_FAST 0
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366 POP_JUMP_IF_FALSE 370
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368 LOAD_CONST_SMALL_INT 1
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369 RETURN_VALUE
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370 LOAD_CONST_NONE
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371 RETURN_VALUE
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369 RAISE_OBJ
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370 LOAD_FAST 0
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371 POP_JUMP_IF_FALSE 375
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373 LOAD_CONST_NONE
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374 RETURN_VALUE
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375 LOAD_FAST 0
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376 POP_JUMP_IF_FALSE 380
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378 LOAD_CONST_SMALL_INT 1
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379 RETURN_VALUE
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380 LOAD_CONST_NONE
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381 RETURN_VALUE
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File cmdline/cmd_showbc.py, code block 'f' (descriptor: \.\+, bytecode @\.\+ 59 bytes)
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Raw bytecode (code_info_size=8, bytecode_size=51):
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a8 10 0a 05 80 82 34 38 81 57 c0 57 c1 57 c2 57
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@ -623,9 +629,9 @@ arg names: *
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08 DELETE_DEREF 0
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10 LOAD_CONST_NONE
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11 RETURN_VALUE
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File cmdline/cmd_showbc.py, code block 'f' (descriptor: \.\+, bytecode @\.\+ 15 bytes)
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Raw bytecode (code_info_size=8, bytecode_size=7):
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9a 01 0a 05 03 08 80 8b b1 25 00 f2 63 51 63
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File cmdline/cmd_showbc.py, code block 'f' (descriptor: \.\+, bytecode @\.\+ 13 bytes)
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Raw bytecode (code_info_size=8, bytecode_size=5):
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9a 01 0a 05 03 08 80 8b b1 25 00 f2 63
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arg names: * b
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(N_STATE 4)
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(N_EXC_STACK 0)
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@ -635,8 +641,6 @@ arg names: * b
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01 LOAD_DEREF 0
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03 BINARY_OP 27 __add__
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04 RETURN_VALUE
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05 LOAD_CONST_NONE
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06 RETURN_VALUE
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mem: total=\\d\+, current=\\d\+, peak=\\d\+
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stack: \\d\+ out of \\d\+
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GC: total: \\d\+, used: \\d\+, free: \\d\+
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|
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@ -0,0 +1,33 @@
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# cmdline: -v -v
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# test printing of bytecode when it's optimised away
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def f0():
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return 0
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print(1)
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def f1(x):
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if x:
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return
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print(1)
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print(2)
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def f2(x):
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raise Exception
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print(1)
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def f3(x):
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while x:
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break
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print(1)
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print(2)
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def f4(x):
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while x:
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continue
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print(1)
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print(2)
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@ -0,0 +1,122 @@
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File cmdline/cmd_showbc_opt.py, code block '<module>' (descriptor: \.\+, bytecode @\.\+ 35 bytes)
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Raw bytecode (code_info_size=13, bytecode_size=22):
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00 16 01 60 20 64 40 84 07 64 40 84 07 32 00 16
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02 32 01 16 03 32 02 16 04 32 03 16 05 32 04 16
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06 51 63
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arg names:
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(N_STATE 1)
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(N_EXC_STACK 0)
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bc=0 line=1
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bc=0 line=4
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bc=0 line=5
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bc=4 line=8
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bc=4 line=10
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bc=8 line=17
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bc=12 line=20
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bc=12 line=22
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bc=16 line=29
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00 MAKE_FUNCTION \.\+
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02 STORE_NAME f0
|
||||
04 MAKE_FUNCTION \.\+
|
||||
06 STORE_NAME f1
|
||||
08 MAKE_FUNCTION \.\+
|
||||
10 STORE_NAME f2
|
||||
12 MAKE_FUNCTION \.\+
|
||||
14 STORE_NAME f3
|
||||
16 MAKE_FUNCTION \.\+
|
||||
18 STORE_NAME f4
|
||||
20 LOAD_CONST_NONE
|
||||
21 RETURN_VALUE
|
||||
File cmdline/cmd_showbc_opt.py, code block 'f0' (descriptor: \.\+, bytecode @\.\+ 8 bytes)
|
||||
Raw bytecode (code_info_size=6, bytecode_size=2):
|
||||
08 08 02 60 40 22 80 63
|
||||
arg names:
|
||||
(N_STATE 2)
|
||||
(N_EXC_STACK 0)
|
||||
bc=0 line=1
|
||||
bc=0 line=4
|
||||
bc=0 line=6
|
||||
bc=2 line=7
|
||||
00 LOAD_CONST_SMALL_INT 0
|
||||
01 RETURN_VALUE
|
||||
File cmdline/cmd_showbc_opt.py, code block 'f1' (descriptor: \.\+, bytecode @\.\+ 22 bytes)
|
||||
Raw bytecode (code_info_size=9, bytecode_size=13):
|
||||
11 0e 03 08 80 0a 23 22 20 b0 44 42 51 63 12 07
|
||||
82 34 01 59 51 63
|
||||
arg names: x
|
||||
(N_STATE 3)
|
||||
(N_EXC_STACK 0)
|
||||
bc=0 line=1
|
||||
bc=0 line=11
|
||||
bc=3 line=12
|
||||
bc=5 line=13
|
||||
bc=5 line=14
|
||||
00 LOAD_FAST 0
|
||||
01 POP_JUMP_IF_FALSE 5
|
||||
03 LOAD_CONST_NONE
|
||||
04 RETURN_VALUE
|
||||
05 LOAD_GLOBAL print
|
||||
07 LOAD_CONST_SMALL_INT 2
|
||||
08 CALL_FUNCTION n=1 nkw=0
|
||||
10 POP_TOP
|
||||
11 LOAD_CONST_NONE
|
||||
12 RETURN_VALUE
|
||||
File cmdline/cmd_showbc_opt.py, code block 'f2' (descriptor: \.\+, bytecode @\.\+ 10 bytes)
|
||||
Raw bytecode (code_info_size=7, bytecode_size=3):
|
||||
11 0a 04 08 80 11 23 12 09 65
|
||||
arg names: x
|
||||
(N_STATE 3)
|
||||
(N_EXC_STACK 0)
|
||||
bc=0 line=1
|
||||
bc=0 line=18
|
||||
bc=3 line=19
|
||||
00 LOAD_GLOBAL Exception
|
||||
02 RAISE_OBJ
|
||||
File cmdline/cmd_showbc_opt.py, code block 'f3' (descriptor: \.\+, bytecode @\.\+ 24 bytes)
|
||||
Raw bytecode (code_info_size=9, bytecode_size=15):
|
||||
11 0e 05 08 80 16 22 22 23 42 42 42 43 b0 43 3b
|
||||
12 07 82 34 01 59 51 63
|
||||
arg names: x
|
||||
(N_STATE 3)
|
||||
(N_EXC_STACK 0)
|
||||
bc=0 line=1
|
||||
bc=0 line=23
|
||||
bc=2 line=24
|
||||
bc=4 line=25
|
||||
bc=7 line=26
|
||||
00 JUMP 4
|
||||
02 JUMP 7
|
||||
04 LOAD_FAST 0
|
||||
05 POP_JUMP_IF_TRUE 2
|
||||
07 LOAD_GLOBAL print
|
||||
09 LOAD_CONST_SMALL_INT 2
|
||||
10 CALL_FUNCTION n=1 nkw=0
|
||||
12 POP_TOP
|
||||
13 LOAD_CONST_NONE
|
||||
14 RETURN_VALUE
|
||||
File cmdline/cmd_showbc_opt.py, code block 'f4' (descriptor: \.\+, bytecode @\.\+ 24 bytes)
|
||||
Raw bytecode (code_info_size=9, bytecode_size=15):
|
||||
11 0e 06 08 80 1d 22 22 23 42 42 42 40 b0 43 3b
|
||||
12 07 82 34 01 59 51 63
|
||||
arg names: x
|
||||
(N_STATE 3)
|
||||
(N_EXC_STACK 0)
|
||||
bc=0 line=1
|
||||
bc=0 line=30
|
||||
bc=2 line=31
|
||||
bc=4 line=32
|
||||
bc=7 line=33
|
||||
00 JUMP 4
|
||||
02 JUMP 4
|
||||
04 LOAD_FAST 0
|
||||
05 POP_JUMP_IF_TRUE 2
|
||||
07 LOAD_GLOBAL print
|
||||
09 LOAD_CONST_SMALL_INT 2
|
||||
10 CALL_FUNCTION n=1 nkw=0
|
||||
12 POP_TOP
|
||||
13 LOAD_CONST_NONE
|
||||
14 RETURN_VALUE
|
||||
mem: total=\\d\+, current=\\d\+, peak=\\d\+
|
||||
stack: \\d\+ out of \\d\+
|
||||
GC: total: \\d\+, used: \\d\+, free: \\d\+
|
||||
No. of 1-blocks: \\d\+, 2-blocks: \\d\+, max blk sz: \\d\+, max free sz: \\d\+
|
||||
Loading…
Reference in New Issue