From 5cb62b003d082c5a32ef5b12a89d872a317fd05f Mon Sep 17 00:00:00 2001 From: Sverker Eriksson Date: Thu, 17 Mar 2016 16:35:08 +0100 Subject: erts: Add matchspec restrictions for 'receive' trace and non-call-trace. This is the easy way out to avoid difficult locking scenarios when accessing tracing flags on another process. --- erts/emulator/beam/erl_db_util.c | 223 +++++++++++++++++---------------------- 1 file changed, 96 insertions(+), 127 deletions(-) (limited to 'erts/emulator/beam/erl_db_util.c') diff --git a/erts/emulator/beam/erl_db_util.c b/erts/emulator/beam/erl_db_util.c index 72d59df813..ae2cc40bfa 100644 --- a/erts/emulator/beam/erl_db_util.c +++ b/erts/emulator/beam/erl_db_util.c @@ -123,6 +123,9 @@ do { \ #define TermWords(t) (((t) / (sizeof(UWord)/sizeof(Eterm))) + !!((t) % (sizeof(UWord)/sizeof(Eterm)))) +#define add_dmc_err(EINFO, STR, VAR, TERM, SEV) \ + vadd_dmc_err(EINFO, SEV, VAR, STR, TERM) + static ERTS_INLINE Process * get_proc(Process *cp, Uint32 cp_locks, Eterm id, Uint32 id_locks) @@ -889,11 +892,7 @@ void db_match_dis(Binary *prog); #define TRACE /* Nothing */ #define FENCE_PATTERN_SIZE 0 #endif -static void add_dmc_err(DMCErrInfo *err_info, - char *str, - int variable, - Eterm term, - DMCErrorSeverity severity); +static void vadd_dmc_err(DMCErrInfo*, DMCErrorSeverity, int var, const char *str, ...); static Eterm dpm_array_to_list(Process *psp, Eterm *arr, int arity); @@ -989,12 +988,16 @@ Eterm erts_match_set_get_source(Binary *mpsp) } /* This one is for the tracing */ -Binary *erts_match_set_compile(Process *p, Eterm matchexpr) { +Binary *erts_match_set_compile(Process *p, Eterm matchexpr, Eterm MFA) { Binary *bin; Uint sz; Eterm *hp; + Uint flags = DCOMP_TRACE; + + if (is_tuple(MFA)) flags |= DCOMP_CALL_TRACE; + if (MFA != am_receive) flags |= DCOMP_ALLOW_TRACE_OPS; - bin = db_match_set_compile(p, matchexpr, DCOMP_TRACE); + bin = db_match_set_compile(p, matchexpr, flags); if (bin != NULL) { MatchProg *prog = Binary2MatchProg(bin); sz = size_object(matchexpr); @@ -1124,8 +1127,8 @@ Eterm db_match_set_lint(Process *p, Eterm matchexpr, Uint flags) int i; if (!is_list(matchexpr)) { - add_dmc_err(err_info, "Match programs are not in a list.", - -1, 0UL, dmcError); + add_dmc_err(err_info, "Match programs are not in a list.", + -1, 0UL, dmcError); goto done; } num_heads = 0; @@ -1133,9 +1136,8 @@ Eterm db_match_set_lint(Process *p, Eterm matchexpr, Uint flags) ++num_heads; if (l != NIL) { /* proper list... */ - add_dmc_err(err_info, "Match programs are not in a proper " - "list.", - -1, 0UL, dmcError); + add_dmc_err(err_info, "Match programs are not in a proper list.", + -1, 0UL, dmcError); goto done; } @@ -3260,20 +3262,20 @@ int erts_db_is_compiled_ms(Eterm term) ** Utility to add an error */ -static void add_dmc_err(DMCErrInfo *err_info, - char *str, - int variable, - Eterm term, - DMCErrorSeverity severity) +static void vadd_dmc_err(DMCErrInfo *err_info, + DMCErrorSeverity severity, + int variable, + const char *str, + ...) { + DMCError *e; + va_list args; + va_start(args, str); + + /* Linked in in reverse order, to ease the formatting */ - DMCError *e = erts_alloc(ERTS_ALC_T_DB_DMC_ERROR, sizeof(DMCError)); - if (term != 0UL) { - erts_snprintf(e->error_string, DMC_ERR_STR_LEN, str, term); - } else { - strncpy(e->error_string, str, DMC_ERR_STR_LEN); - e->error_string[DMC_ERR_STR_LEN] ='\0'; - } + e = erts_alloc(ERTS_ALC_T_DB_DMC_ERROR, sizeof(DMCError)); + erts_vsnprintf(e->error_string, DMC_ERR_STR_LEN, str, args); e->variable = variable; e->severity = severity; e->next = err_info->first; @@ -3283,8 +3285,11 @@ static void add_dmc_err(DMCErrInfo *err_info, err_info->first = e; if (severity >= dmcError) err_info->error_added = 1; + + va_end(args); } + /* ** Handle one term in the match expression (not the guard) */ @@ -3483,24 +3488,21 @@ static void do_emit_constant(DMCContext *context, DMC_STACK_TYPE(UWord) *text, context->stack_need = context->stack_used; } -#define RETURN_ERROR_X(String, X, Y, ContextP, ConstantF) \ -do { \ -if ((ContextP)->err_info != NULL) { \ - (ConstantF) = 0; \ - add_dmc_err((ContextP)->err_info, String, X, Y, dmcError); \ - return retOk; \ -} else \ - return retFail; \ -} while(0) +#define RETURN_ERROR_X(VAR, ContextP, ConstantF, String, ARG) \ + (((ContextP)->err_info != NULL) \ + ? ((ConstantF) = 0, \ + vadd_dmc_err((ContextP)->err_info, dmcError, VAR, String, ARG), \ + retOk) \ + : retFail) #define RETURN_ERROR(String, ContextP, ConstantF) \ - RETURN_ERROR_X(String, -1, 0UL, ContextP, ConstantF) + return RETURN_ERROR_X(-1, ContextP, ConstantF, String, 0) #define RETURN_VAR_ERROR(String, N, ContextP, ConstantF) \ - RETURN_ERROR_X(String, N, 0UL, ContextP, ConstantF) + return RETURN_ERROR_X(N, ContextP, ConstantF, String, 0) #define RETURN_TERM_ERROR(String, T, ContextP, ConstantF) \ - RETURN_ERROR_X(String, -1, T, ContextP, ConstantF) + return RETURN_ERROR_X(-1, ContextP, ConstantF, String, T) #define WARNING(String, ContextP) \ add_dmc_err((ContextP)->err_info, String, -1, 0UL, dmcWarning) @@ -3766,7 +3768,7 @@ static DMCRet dmc_variable(DMCContext *context, Uint n = db_is_variable(t); if (n >= heap->vars_used || !heap->vars[n].is_bound) { - RETURN_VAR_ERROR("Variable $%d is unbound.", n, context, *constant); + RETURN_VAR_ERROR("Variable $%%d is unbound.", n, context, *constant); } dmc_add_pushv_variant(context, heap, text, n); @@ -4098,7 +4100,30 @@ static DMCRet dmc_exception_trace(DMCContext *context, return retOk; } - +static int check_trace(const char* op, + DMCContext *context, + int *constant, + int need_cflags, + int allow_in_guard, + DMCRet* retp) +{ + if (!(context->cflags & DCOMP_TRACE)) { + *retp = RETURN_ERROR_X(-1, context, *constant, "Special form '%s' " + "used in wrong dialect.", op); + return 0; + } + if ((context->cflags & need_cflags) != need_cflags) { + *retp = RETURN_ERROR_X(-1, context, *constant, "Special form '%s' " + "not allow for this trace event.", op); + return 0; + } + if (context->is_guard && !allow_in_guard) { + *retp = RETURN_ERROR_X(-1, context, *constant, "Special form '%s' " + "called in guard context.", op); + return 0; + } + return 1; +} static DMCRet dmc_is_seq_trace(DMCContext *context, DMCHeap *heap, @@ -4108,12 +4133,11 @@ static DMCRet dmc_is_seq_trace(DMCContext *context, { Eterm *p = tuple_val(t); Uint a = arityval(*p); + DMCRet ret; - if (!(context->cflags & DCOMP_TRACE)) { - RETURN_ERROR("Special form 'is_seq_trace' used in wrong dialect.", - context, - *constant); - } + if (!check_trace("is_seq_trace", context, constant, DCOMP_ALLOW_TRACE_OPS, 1, &ret)) + return ret; + if (a != 1) { RETURN_TERM_ERROR("Special form 'is_seq_trace' called with " "arguments in %T.", t, context, *constant); @@ -4137,16 +4161,8 @@ static DMCRet dmc_set_seq_token(DMCContext *context, DMCRet ret; int c; - - if (!(context->cflags & DCOMP_TRACE)) { - RETURN_ERROR("Special form 'set_seq_token' used in wrong dialect.", - context, - *constant); - } - if (context->is_guard) { - RETURN_ERROR("Special form 'set_seq_token' called in " - "guard context.", context, *constant); - } + if (!check_trace("set_seq_trace", context, constant, DCOMP_ALLOW_TRACE_OPS, 0, &ret)) + return ret; if (a != 3) { RETURN_TERM_ERROR("Special form 'set_seq_token' called with wrong " @@ -4183,16 +4199,11 @@ static DMCRet dmc_get_seq_token(DMCContext *context, { Eterm *p = tuple_val(t); Uint a = arityval(*p); + DMCRet ret; + + if (!check_trace("get_seq_token", context, constant, DCOMP_ALLOW_TRACE_OPS, 0, &ret)) + return ret; - if (!(context->cflags & DCOMP_TRACE)) { - RETURN_ERROR("Special form 'get_seq_token' used in wrong dialect.", - context, - *constant); - } - if (context->is_guard) { - RETURN_ERROR("Special form 'get_seq_token' called in " - "guard context.", context, *constant); - } if (a != 1) { RETURN_TERM_ERROR("Special form 'get_seq_token' called with " "arguments in %T.", t, context, @@ -4256,16 +4267,10 @@ static DMCRet dmc_process_dump(DMCContext *context, { Eterm *p = tuple_val(t); Uint a = arityval(*p); - - if (!(context->cflags & DCOMP_TRACE)) { - RETURN_ERROR("Special form 'process_dump' used in wrong dialect.", - context, - *constant); - } - if (context->is_guard) { - RETURN_ERROR("Special form 'process_dump' called in " - "guard context.", context, *constant); - } + DMCRet ret; + + if (!check_trace("process_dump", context, constant, DCOMP_ALLOW_TRACE_OPS, 0, &ret)) + return ret; if (a != 1) { RETURN_TERM_ERROR("Special form 'process_dump' called with " @@ -4289,17 +4294,8 @@ static DMCRet dmc_enable_trace(DMCContext *context, DMCRet ret; int c; - - if (!(context->cflags & DCOMP_TRACE)) { - RETURN_ERROR("Special form 'enable_trace' used in wrong dialect.", - context, - *constant); - } - if (context->is_guard) { - RETURN_ERROR("Special form 'enable_trace' called in guard context.", - context, - *constant); - } + if (!check_trace("enable_trace", context, constant, DCOMP_ALLOW_TRACE_OPS, 0, &ret)) + return ret; switch (a) { case 2: @@ -4348,18 +4344,9 @@ static DMCRet dmc_disable_trace(DMCContext *context, Uint a = arityval(*p); DMCRet ret; int c; - - if (!(context->cflags & DCOMP_TRACE)) { - RETURN_ERROR("Special form 'disable_trace' used in wrong dialect.", - context, - *constant); - } - if (context->is_guard) { - RETURN_ERROR("Special form 'disable_trace' called in guard context.", - context, - *constant); - } + if (!check_trace("disable_trace", context, constant, DCOMP_ALLOW_TRACE_OPS, 0, &ret)) + return ret; switch (a) { case 2: @@ -4409,17 +4396,8 @@ static DMCRet dmc_trace(DMCContext *context, DMCRet ret; int c; - - if (!(context->cflags & DCOMP_TRACE)) { - RETURN_ERROR("Special form 'trace' used in wrong dialect.", - context, - *constant); - } - if (context->is_guard) { - RETURN_ERROR("Special form 'trace' called in guard context.", - context, - *constant); - } + if (!check_trace("trace", context, constant, DCOMP_ALLOW_TRACE_OPS, 0, &ret)) + return ret; switch (a) { case 3: @@ -4480,16 +4458,11 @@ static DMCRet dmc_caller(DMCContext *context, { Eterm *p = tuple_val(t); Uint a = arityval(*p); + DMCRet ret; - if (!(context->cflags & DCOMP_TRACE)) { - RETURN_ERROR("Special form 'caller' used in wrong dialect.", - context, - *constant); - } - if (context->is_guard) { - RETURN_ERROR("Special form 'caller' called in " - "guard context.", context, *constant); - } + if (!check_trace("caller", context, constant, + (DCOMP_CALL_TRACE|DCOMP_ALLOW_TRACE_OPS), 0, &ret)) + return ret; if (a != 1) { RETURN_TERM_ERROR("Special form 'caller' called with " @@ -4515,15 +4488,8 @@ static DMCRet dmc_silent(DMCContext *context, DMCRet ret; int c; - if (!(context->cflags & DCOMP_TRACE)) { - RETURN_ERROR("Special form 'silent' used in wrong dialect.", - context, - *constant); - } - if (context->is_guard) { - RETURN_ERROR("Special form 'silent' called in " - "guard context.", context, *constant); - } + if (!check_trace("silent", context, constant, DCOMP_ALLOW_TRACE_OPS, 0, &ret)) + return ret; if (a != 2) { RETURN_TERM_ERROR("Special form 'silent' called with wrong " @@ -5063,11 +5029,14 @@ static Eterm match_spec_test(Process *p, Eterm against, Eterm spec, int trace) return THE_NON_VALUE; } if (trace) { - lint_res = db_match_set_lint(p, spec, DCOMP_TRACE | DCOMP_FAKE_DESTRUCTIVE); - mps = db_match_set_compile(p, spec, DCOMP_TRACE | DCOMP_FAKE_DESTRUCTIVE); + const Uint cflags = (DCOMP_TRACE | DCOMP_FAKE_DESTRUCTIVE | + DCOMP_CALL_TRACE | DCOMP_ALLOW_TRACE_OPS); + lint_res = db_match_set_lint(p, spec, cflags); + mps = db_match_set_compile(p, spec, cflags); } else { - lint_res = db_match_set_lint(p, spec, DCOMP_TABLE | DCOMP_FAKE_DESTRUCTIVE); - mps = db_match_set_compile(p, spec, DCOMP_TABLE | DCOMP_FAKE_DESTRUCTIVE); + const Uint cflags = (DCOMP_TABLE | DCOMP_FAKE_DESTRUCTIVE); + lint_res = db_match_set_lint(p, spec, cflags); + mps = db_match_set_compile(p, spec, cflags); } if (mps == NULL) { -- cgit v1.2.3