diff options
author | Björn Gustavsson <bjorn@erlang.org> | 2011-11-10 14:42:47 +0100 |
---|---|---|
committer | Björn Gustavsson <bjorn@erlang.org> | 2011-11-14 14:47:18 +0100 |
commit | 0b27c0ce578db5266dbaaa50a6d116836a03aa94 (patch) | |
tree | 9ee2bacc604351671484a9e752e1f096389c3016 /erts | |
parent | 4de78fc7542905a519ec52b91769df63f8939952 (diff) | |
download | otp-0b27c0ce578db5266dbaaa50a6d116836a03aa94.tar.gz otp-0b27c0ce578db5266dbaaa50a6d116836a03aa94.tar.bz2 otp-0b27c0ce578db5266dbaaa50a6d116836a03aa94.zip |
BEAM loader: Refactor code loading into separate functions
Break apart code loading into the three functions:
erts_alloc_loader_state()
erts_prepare_loading()
erts_finish_loading()
The erts_alloc_loader_state() and erts_prepare_loading() can be
executed with all schedulers running. Only erts_finish_loading()
needs to be run in a single-scheduling system.
Diffstat (limited to 'erts')
-rw-r--r-- | erts/emulator/beam/beam_load.c | 340 | ||||
-rw-r--r-- | erts/emulator/beam/beam_load.h | 1 | ||||
-rw-r--r-- | erts/emulator/beam/global.h | 8 |
3 files changed, 196 insertions, 153 deletions
diff --git a/erts/emulator/beam/beam_load.c b/erts/emulator/beam/beam_load.c index cf4c04a135..10ed46417b 100644 --- a/erts/emulator/beam/beam_load.c +++ b/erts/emulator/beam/beam_load.c @@ -245,7 +245,7 @@ typedef struct { * This structure contains all information about the module being loaded. */ -typedef struct { +typedef struct LoaderState { /* * The current logical file within the binary. */ @@ -494,13 +494,10 @@ typedef struct { } while (0) -static Eterm bin_load(Process *c_p, ErtsProcLocks c_p_locks, - Eterm group_leader, Eterm* modp, byte* bytes, int unloaded_size); -static void init_state(LoaderState* stp); static void free_state(LoaderState* stp); static Eterm insert_new_code(Process *c_p, ErtsProcLocks c_p_locks, - Eterm group_leader, Eterm module, - BeamInstr* code, Uint size, BeamInstr catches); + Eterm group_leader, Eterm module, + BeamInstr* code, Uint size); static int scan_iff_file(LoaderState* stp, Uint* chunk_types, Uint num_types, Uint num_mandatory); static int load_atom_table(LoaderState* stp); @@ -602,29 +599,17 @@ erts_load_module(Process *c_p, * On return, contains the actual module name. */ byte* code, /* Points to the code to load */ - int size) /* Size of code to load. */ + Uint size) /* Size of code to load. */ { - ErlDrvBinary* bin; - Eterm result; + LoaderState* stp = erts_alloc_loader_state(); + Eterm retval; - if (size >= 4 && code[0] == 'F' && code[1] == 'O' && - code[2] == 'R' && code[3] == '1') { - /* - * The BEAM module is not compressed. - */ - result = bin_load(c_p, c_p_locks, group_leader, modp, code, size); - } else { - /* - * The BEAM module is compressed (or possibly invalid/corrupted). - */ - if ((bin = (ErlDrvBinary *) erts_gzinflate_buffer((char*)code, size)) == NULL) { - return am_badfile; - } - result = bin_load(c_p, c_p_locks, group_leader, modp, - (byte*)bin->orig_bytes, bin->orig_size); - driver_free_binary(bin); + retval = erts_prepare_loading(stp, c_p, group_leader, modp, + code, size); + if (retval != NIL) { + return retval; } - return result; + return erts_finish_loading(stp, c_p, c_p_locks, modp); } /* #define LOAD_MEMORY_HARD_DEBUG 1*/ @@ -639,16 +624,30 @@ extern void check_allocated_block(Uint type, void *blk); #define CHKBLK(TYPE,BLK) /* nothing */ #endif -static Eterm -bin_load(Process *c_p, ErtsProcLocks c_p_locks, - Eterm group_leader, Eterm* modp, byte* bytes, int unloaded_size) +Eterm +erts_prepare_loading(LoaderState* stp, Process *c_p, Eterm group_leader, + Eterm* modp, byte* code, Uint unloaded_size) { - LoaderState state; Eterm retval = am_badfile; + ErlDrvBinary* bin = NULL; - init_state(&state); - state.module = *modp; - state.group_leader = group_leader; + stp->module = *modp; + stp->group_leader = group_leader; + + /* + * Check if the module is compressed (or possibly invalid/corrupted). + */ + if ( !(unloaded_size >= 4 && + code[0] == 'F' && code[1] == 'O' && + code[2] == 'R' && code[3] == '1') ) { + bin = (ErlDrvBinary *) + erts_gzinflate_buffer((char*)code, unloaded_size); + if (bin == NULL) { + goto load_error; + } + code = (byte*)bin->orig_bytes; + unloaded_size = bin->orig_size; + } /* * Scan the IFF file. @@ -659,11 +658,11 @@ bin_load(Process *c_p, ErtsProcLocks c_p_locks, #endif CHKALLOC(); - CHKBLK(ERTS_ALC_T_CODE,state.code); - state.file_name = "IFF header for Beam file"; - state.file_p = bytes; - state.file_left = unloaded_size; - if (!scan_iff_file(&state, chunk_types, NUM_CHUNK_TYPES, NUM_MANDATORY)) { + CHKBLK(ERTS_ALC_T_CODE,stp->code); + stp->file_name = "IFF header for Beam file"; + stp->file_p = code; + stp->file_left = unloaded_size; + if (!scan_iff_file(stp, chunk_types, NUM_CHUNK_TYPES, NUM_MANDATORY)) { goto load_error; } @@ -671,38 +670,38 @@ bin_load(Process *c_p, ErtsProcLocks c_p_locks, * Read the header for the code chunk. */ - CHKBLK(ERTS_ALC_T_CODE,state.code); - define_file(&state, "code chunk header", CODE_CHUNK); - if (!read_code_header(&state)) { + CHKBLK(ERTS_ALC_T_CODE,stp->code); + define_file(stp, "code chunk header", CODE_CHUNK); + if (!read_code_header(stp)) { goto load_error; } /* * Initialize code area. */ - state.code_buffer_size = erts_next_heap_size(2048 + state.num_functions, 0); - state.code = (BeamInstr *) erts_alloc(ERTS_ALC_T_CODE, - sizeof(BeamInstr) * state.code_buffer_size); + stp->code_buffer_size = erts_next_heap_size(2048 + stp->num_functions, 0); + stp->code = (BeamInstr *) erts_alloc(ERTS_ALC_T_CODE, + sizeof(BeamInstr) * stp->code_buffer_size); - state.code[MI_NUM_FUNCTIONS] = state.num_functions; - state.ci = MI_FUNCTIONS + state.num_functions + 1; + stp->code[MI_NUM_FUNCTIONS] = stp->num_functions; + stp->ci = MI_FUNCTIONS + stp->num_functions + 1; - state.code[MI_ATTR_PTR] = 0; - state.code[MI_ATTR_SIZE] = 0; - state.code[MI_ATTR_SIZE_ON_HEAP] = 0; - state.code[MI_COMPILE_PTR] = 0; - state.code[MI_COMPILE_SIZE] = 0; - state.code[MI_COMPILE_SIZE_ON_HEAP] = 0; - state.code[MI_NUM_BREAKPOINTS] = 0; + stp->code[MI_ATTR_PTR] = 0; + stp->code[MI_ATTR_SIZE] = 0; + stp->code[MI_ATTR_SIZE_ON_HEAP] = 0; + stp->code[MI_COMPILE_PTR] = 0; + stp->code[MI_COMPILE_SIZE] = 0; + stp->code[MI_COMPILE_SIZE_ON_HEAP] = 0; + stp->code[MI_NUM_BREAKPOINTS] = 0; /* * Read the atom table. */ - CHKBLK(ERTS_ALC_T_CODE,state.code); - define_file(&state, "atom table", ATOM_CHUNK); - if (!load_atom_table(&state)) { + CHKBLK(ERTS_ALC_T_CODE,stp->code); + define_file(stp, "atom table", ATOM_CHUNK); + if (!load_atom_table(stp)) { goto load_error; } @@ -710,9 +709,9 @@ bin_load(Process *c_p, ErtsProcLocks c_p_locks, * Read the import table. */ - CHKBLK(ERTS_ALC_T_CODE,state.code); - define_file(&state, "import table", IMP_CHUNK); - if (!load_import_table(&state)) { + CHKBLK(ERTS_ALC_T_CODE,stp->code); + define_file(stp, "import table", IMP_CHUNK); + if (!load_import_table(stp)) { goto load_error; } @@ -720,10 +719,10 @@ bin_load(Process *c_p, ErtsProcLocks c_p_locks, * Read the lambda (fun) table. */ - CHKBLK(ERTS_ALC_T_CODE,state.code); - if (state.chunks[LAMBDA_CHUNK].size > 0) { - define_file(&state, "lambda (fun) table", LAMBDA_CHUNK); - if (!read_lambda_table(&state)) { + CHKBLK(ERTS_ALC_T_CODE,stp->code); + if (stp->chunks[LAMBDA_CHUNK].size > 0) { + define_file(stp, "lambda (fun) table", LAMBDA_CHUNK); + if (!read_lambda_table(stp)) { goto load_error; } } @@ -732,10 +731,10 @@ bin_load(Process *c_p, ErtsProcLocks c_p_locks, * Read the literal table. */ - CHKBLK(ERTS_ALC_T_CODE,state.code); - if (state.chunks[LITERAL_CHUNK].size > 0) { - define_file(&state, "literals table (constant pool)", LITERAL_CHUNK); - if (!read_literal_table(&state)) { + CHKBLK(ERTS_ALC_T_CODE,stp->code); + if (stp->chunks[LITERAL_CHUNK].size > 0) { + define_file(stp, "literals table (constant pool)", LITERAL_CHUNK); + if (!read_literal_table(stp)) { goto load_error; } } @@ -744,35 +743,27 @@ bin_load(Process *c_p, ErtsProcLocks c_p_locks, * Read the line table (if present). */ - CHKBLK(ERTS_ALC_T_CODE,state.code); - if (state.chunks[LINE_CHUNK].size > 0) { - define_file(&state, "line table", LINE_CHUNK); - if (!read_line_table(&state)) { + CHKBLK(ERTS_ALC_T_CODE,stp->code); + if (stp->chunks[LINE_CHUNK].size > 0) { + define_file(stp, "line table", LINE_CHUNK); + if (!read_line_table(stp)) { goto load_error; } } /* - * Since the literal table *may* have contained external - * funs (containing references to export entries), now is - * the time to consolidate the export tables. - */ - - erts_export_consolidate(); - - /* * Load the code chunk. */ - CHKBLK(ERTS_ALC_T_CODE,state.code); - state.file_name = "code chunk"; - state.file_p = state.code_start; - state.file_left = state.code_size; - if (!load_code(&state)) { + CHKBLK(ERTS_ALC_T_CODE,stp->code); + stp->file_name = "code chunk"; + stp->file_p = stp->code_start; + stp->file_left = stp->code_size; + if (!load_code(stp)) { goto load_error; } - CHKBLK(ERTS_ALC_T_CODE,state.code); - if (!freeze_code(&state)) { + CHKBLK(ERTS_ALC_T_CODE,stp->code); + if (!freeze_code(stp)) { goto load_error; } @@ -782,56 +773,96 @@ bin_load(Process *c_p, ErtsProcLocks c_p_locks, * loading the code, because it contains labels.) */ - CHKBLK(ERTS_ALC_T_CODE,state.code); - define_file(&state, "export table", EXP_CHUNK); - if (!read_export_table(&state)) { + CHKBLK(ERTS_ALC_T_CODE,stp->code); + define_file(stp, "export table", EXP_CHUNK); + if (!read_export_table(stp)) { goto load_error; } /* - * Ready for the final touch: fixing the export table entries for - * exported and imported functions. This can't fail. + * Good so far. */ - - CHKBLK(ERTS_ALC_T_CODE,state.code); - retval = insert_new_code(c_p, c_p_locks, state.group_leader, state.module, - state.code, state.loaded_size, state.catches); + + retval = NIL; + + load_error: + if (bin) { + driver_free_binary(bin); + } + if (retval != NIL) { + free_state(stp); + } + return retval; +} + +Eterm +erts_finish_loading(LoaderState* stp, Process* c_p, + ErtsProcLocks c_p_locks, Eterm* modp) +{ + Eterm retval; + + /* + * No other process may run since we will update the export + * table which is not protected by any locks. + */ + + ERTS_SMP_LC_ASSERT(erts_initialized == 0 || + erts_smp_thr_progress_is_blocking()); + + /* + * Make current code for the module old and insert the new code + * as current. This will fail if there already exists old code + * for the module. + */ + + CHKBLK(ERTS_ALC_T_CODE,stp->code); + retval = insert_new_code(c_p, c_p_locks, stp->group_leader, stp->module, + stp->code, stp->loaded_size); if (retval != NIL) { goto load_error; } - CHKBLK(ERTS_ALC_T_CODE,state.code); - final_touch(&state); + + /* + * Ready for the final touch: fixing the export table entries for + * exported and imported functions. This can't fail. + */ + + erts_export_consolidate(); + CHKBLK(ERTS_ALC_T_CODE,stp->code); + final_touch(stp); /* * Loading succeded. */ - CHKBLK(ERTS_ALC_T_CODE,state.code); + CHKBLK(ERTS_ALC_T_CODE,stp->code); #if defined(LOAD_MEMORY_HARD_DEBUG) && defined(DEBUG) erts_fprintf(stderr,"Loaded %T\n",*modp); #if 0 - debug_dump_code(state.code,state.ci); + debug_dump_code(stp->code,stp->ci); #endif #endif - state.code = NULL; /* Prevent code from being freed. */ - *modp = state.module; + stp->code = NULL; /* Prevent code from being freed. */ + *modp = stp->module; /* * If there is an on_load function, signal an error to * indicate that the on_load function must be run. */ - if (state.on_load) { + if (stp->on_load) { retval = am_on_load; } load_error: - free_state(&state); + free_state(stp); return retval; } - -static void -init_state(LoaderState* stp) +LoaderState* +erts_alloc_loader_state(void) { + LoaderState* stp; + + stp = erts_alloc(ERTS_ALC_T_LOADER_TMP, sizeof(LoaderState)); stp->function = THE_NON_VALUE; /* Function not known yet */ stp->arity = 0; stp->specific_op = -1; @@ -859,6 +890,7 @@ init_state(LoaderState* stp) stp->line_instr = 0; stp->func_line = 0; stp->fname = 0; + return stp; } static void @@ -923,12 +955,13 @@ free_state(LoaderState* stp) if (stp->fname != 0) { erts_free(ERTS_ALC_T_LOADER_TMP, stp->fname); } + erts_free(ERTS_ALC_T_LOADER_TMP, stp); } static Eterm insert_new_code(Process *c_p, ErtsProcLocks c_p_locks, Eterm group_leader, Eterm module, BeamInstr* code, - Uint size, BeamInstr catches) + Uint size) { Module* modp; Eterm retval; @@ -951,7 +984,7 @@ insert_new_code(Process *c_p, ErtsProcLocks c_p_locks, modp = erts_put_module(module); modp->code = code; modp->code_length = size; - modp->catches = catches; + modp->catches = BEAM_CATCHES_NIL; /* Will be filled in later. */ /* * Update address table (used for finding a function from a PC value). @@ -3861,7 +3894,6 @@ freeze_code(LoaderState* stp) unsigned attr_size = stp->chunks[ATTR_CHUNK].size; unsigned compile_size = stp->chunks[COMPILE_CHUNK].size; Uint size; - unsigned catches; Sint decoded_size; Uint line_size; @@ -4116,21 +4148,6 @@ freeze_code(LoaderState* stp) CHKBLK(ERTS_ALC_T_CODE,code); /* - * Fix all catch_yf instructions. - */ - index = stp->catches; - catches = BEAM_CATCHES_NIL; - while (index != 0) { - BeamInstr next = code[index]; - code[index] = BeamOpCode(op_catch_yf); - catches = beam_catches_cons((BeamInstr *)code[index+2], catches); - code[index+2] = make_catch(catches); - index = next; - } - stp->catches = catches; - CHKBLK(ERTS_ALC_T_CODE,code); - - /* * Save the updated code pointer and code size. */ @@ -4155,6 +4172,26 @@ final_touch(LoaderState* stp) { int i; int on_load = stp->on_load; + unsigned catches; + Uint index; + BeamInstr* code = stp->code; + Module* modp; + + /* + * Allocate catch indices and fix up all catch_yf instructions. + */ + + index = stp->catches; + catches = BEAM_CATCHES_NIL; + while (index != 0) { + BeamInstr next = code[index]; + code[index] = BeamOpCode(op_catch_yf); + catches = beam_catches_cons((BeamInstr *)code[index+2], catches); + code[index+2] = make_catch(catches); + index = next; + } + modp = erts_put_module(stp->module); + modp->catches = catches; /* * Export functions. @@ -5692,7 +5729,7 @@ patch_funentries(Eterm Patchlist) Eterm erts_make_stub_module(Process* p, Eterm Mod, Eterm Beam, Eterm Info) { - LoaderState state; + LoaderState* stp; BeamInstr Funcs; BeamInstr Patchlist; Eterm* tp; @@ -5711,10 +5748,10 @@ erts_make_stub_module(Process* p, Eterm Mod, Eterm Beam, Eterm Info) Uint size; /* - * Must initialize state.lambdas here because the error handling code + * Must initialize stp->lambdas here because the error handling code * at label 'error' uses it. */ - init_state(&state); + stp = erts_alloc_loader_state(); if (is_not_atom(Mod)) { goto error; @@ -5754,31 +5791,31 @@ erts_make_stub_module(Process* p, Eterm Mod, Eterm Beam, Eterm Info) * Scan the Beam binary and read the interesting sections. */ - state.file_name = "IFF header for Beam file"; - state.file_p = bytes; - state.file_left = size; - state.module = Mod; - state.group_leader = p->group_leader; - state.num_functions = n; - if (!scan_iff_file(&state, chunk_types, NUM_CHUNK_TYPES, NUM_MANDATORY)) { + stp->file_name = "IFF header for Beam file"; + stp->file_p = bytes; + stp->file_left = size; + stp->module = Mod; + stp->group_leader = p->group_leader; + stp->num_functions = n; + if (!scan_iff_file(stp, chunk_types, NUM_CHUNK_TYPES, NUM_MANDATORY)) { goto error; } - define_file(&state, "code chunk header", CODE_CHUNK); - if (!read_code_header(&state)) { + define_file(stp, "code chunk header", CODE_CHUNK); + if (!read_code_header(stp)) { goto error; } - define_file(&state, "atom table", ATOM_CHUNK); - if (!load_atom_table(&state)) { + define_file(stp, "atom table", ATOM_CHUNK); + if (!load_atom_table(stp)) { goto error; } - define_file(&state, "export table", EXP_CHUNK); - if (!stub_read_export_table(&state)) { + define_file(stp, "export table", EXP_CHUNK); + if (!stub_read_export_table(stp)) { goto error; } - if (state.chunks[LAMBDA_CHUNK].size > 0) { - define_file(&state, "lambda (fun) table", LAMBDA_CHUNK); - if (!read_lambda_table(&state)) { + if (stp->chunks[LAMBDA_CHUNK].size > 0) { + define_file(stp, "lambda (fun) table", LAMBDA_CHUNK); + if (!read_lambda_table(stp)) { goto error; } } @@ -5788,8 +5825,8 @@ erts_make_stub_module(Process* p, Eterm Mod, Eterm Beam, Eterm Info) */ code_size = ((WORDS_PER_FUNCTION+1)*n + MI_FUNCTIONS + 2) * sizeof(BeamInstr); - code_size += state.chunks[ATTR_CHUNK].size; - code_size += state.chunks[COMPILE_CHUNK].size; + code_size += stp->chunks[ATTR_CHUNK].size; + code_size += stp->chunks[COMPILE_CHUNK].size; code = erts_alloc_fnf(ERTS_ALC_T_CODE, code_size); if (!code) { goto error; @@ -5879,12 +5916,12 @@ erts_make_stub_module(Process* p, Eterm Mod, Eterm Beam, Eterm Info) */ info = (byte *) fp; - info = stub_copy_info(&state, ATTR_CHUNK, info, + info = stub_copy_info(stp, ATTR_CHUNK, info, code+MI_ATTR_PTR, code+MI_ATTR_SIZE_ON_HEAP); if (info == NULL) { goto error; } - info = stub_copy_info(&state, COMPILE_CHUNK, info, + info = stub_copy_info(stp, COMPILE_CHUNK, info, code+MI_COMPILE_PTR, code+MI_COMPILE_SIZE_ON_HEAP); if (info == NULL) { goto error; @@ -5894,8 +5931,7 @@ erts_make_stub_module(Process* p, Eterm Mod, Eterm Beam, Eterm Info) * Insert the module in the module table. */ - rval = insert_new_code(p, 0, p->group_leader, Mod, code, code_size, - BEAM_CATCHES_NIL); + rval = insert_new_code(p, 0, p->group_leader, Mod, code, code_size); if (rval != NIL) { goto error; } @@ -5906,13 +5942,13 @@ erts_make_stub_module(Process* p, Eterm Mod, Eterm Beam, Eterm Info) fp = code + ci; for (i = 0; i < n; i++) { - stub_final_touch(&state, fp); + stub_final_touch(stp, fp); fp += WORDS_PER_FUNCTION; } if (patch_funentries(Patchlist)) { erts_free_aligned_binary_bytes(temp_alloc); - free_state(&state); + free_state(stp); if (bin != NULL) { driver_free_binary(bin); } @@ -5920,7 +5956,7 @@ erts_make_stub_module(Process* p, Eterm Mod, Eterm Beam, Eterm Info) } error: - free_state(&state); + free_state(stp); BIF_ERROR(p, BADARG); } diff --git a/erts/emulator/beam/beam_load.h b/erts/emulator/beam/beam_load.h index 2956bd0add..126d9a3935 100644 --- a/erts/emulator/beam/beam_load.h +++ b/erts/emulator/beam/beam_load.h @@ -26,6 +26,7 @@ Eterm beam_make_current_old(Process *c_p, ErtsProcLocks c_p_locks, Eterm module); + typedef struct gen_op_entry { char* name; int arity; diff --git a/erts/emulator/beam/global.h b/erts/emulator/beam/global.h index 6c75c3876b..9f19172e08 100644 --- a/erts/emulator/beam/global.h +++ b/erts/emulator/beam/global.h @@ -866,8 +866,14 @@ typedef struct { Eterm* fname_ptr; /* Pointer to fname table */ } FunctionInfo; +struct LoaderState* erts_alloc_loader_state(void); +Eterm erts_prepare_loading(struct LoaderState*, Process *c_p, + Eterm group_leader, Eterm* modp, + byte* code, Uint size); +Eterm erts_finish_loading(struct LoaderState* stp, Process* c_p, + ErtsProcLocks c_p_locks, Eterm* modp); Eterm erts_load_module(Process *c_p, ErtsProcLocks c_p_locks, - Eterm group_leader, Eterm* mod, byte* code, int size); + Eterm group_leader, Eterm* mod, byte* code, Uint size); void init_load(void); BeamInstr* find_function_from_pc(BeamInstr* pc); Eterm* erts_build_mfa_item(FunctionInfo* fi, Eterm* hp, |