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[clang] translate capture-by-reference correctly

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Summary: The Clang frontend previously didn't distinguish between capture-by-value and capture-by-reference.

Reviewed By: dulmarod

Differential Revision: D7100561

fbshipit-source-id: 3ef168e
master
Sam Blackshear 7 years ago committed by Facebook Github Bot
parent c689d5a91e
commit aca9d034a7
2 changed files with 32 additions and 13 deletions
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33
infer/src/clang/cTrans.ml
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@ -2671,16 +2671,35 @@ module CTrans_funct (F : CModule_type.CFrontend) : CModule_type.CTranslation = s
CFrontend_config.incorrect_assumption __POS__ stmt_info.Clang_ast_t.si_source_range
"Capture-init statement without var decl"
in
let translate_normal_capture pvar_typ (trans_results_acc, captured_vars_acc) =
let translate_normal_capture ~is_by_ref ((pvar, typ) as pvar_typ)
(trans_results_acc, captured_vars_acc) =
let loc = CLocation.get_sil_location stmt_info context in
if is_by_ref then (trans_results_acc, (Exp.Lvar pvar, pvar, typ) :: captured_vars_acc)
else
let id, instr = assign_captured_var loc pvar_typ in
let trans_results = {empty_res_trans with instrs= [instr]} in
( trans_results :: trans_results_acc
, (Exp.Var id, fst pvar_typ, snd pvar_typ) :: captured_vars_acc )
(trans_results :: trans_results_acc, (Exp.Var id, pvar, typ) :: captured_vars_acc)
in
let translate_captured
{Clang_ast_t.lci_captured_var; lci_init_captured_vardecl; lci_capture_this}
((trans_results_acc, captured_vars_acc) as acc) =
{ Clang_ast_t.lci_captured_var
; lci_init_captured_vardecl
; lci_capture_this
; lci_capture_kind } ((trans_results_acc, captured_vars_acc) as acc) =
let is_by_ref =
(* see http://en.cppreference.com/w/cpp/language/lambda *)
match lci_capture_kind with
| `LCK_ByRef (* explicit with [&x] or implicit with [&] *)
| `LCK_This (* explicit with [this] or implicit with [&] *)
| `LCK_VLAType
(* capture a variable-length array by reference. we probably don't handle
this correctly elsewhere, but it's definitely not captured by value! *) ->
true
| `LCK_ByCopy (* explicit with [x] or implicit with [=] *) ->
(* [=] captures this by reference and everything else by value *)
lci_capture_this
| `LCK_StarThis (* [*this] is special syntax for capturing current object by value *) ->
false
in
match (lci_captured_var, lci_init_captured_vardecl) with
| Some captured_var_decl_ref, Some init_decl ->
(* capture and init *)
@ -2690,12 +2709,12 @@ module CTrans_funct (F : CModule_type.CFrontend) : CModule_type.CTranslation = s
| Some captured_var_decl_ref, None ->
(* just capture *)
let pvar_typ = get_captured_pvar_typ captured_var_decl_ref in
translate_normal_capture pvar_typ acc
translate_normal_capture ~is_by_ref pvar_typ acc
| None, None ->
if lci_capture_this then
(* captured [this] *)
let this_typ = get_this_pvar_typ stmt_info context in
translate_normal_capture this_typ acc
translate_normal_capture ~is_by_ref this_typ acc
else acc
| None, Some _ ->
CFrontend_config.incorrect_assumption __POS__ stmt_info.Clang_ast_t.si_source_range

8
infer/tests/codetoanalyze/cpp/shared/lambda/lambda1.cpp.dot
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@ -79,7 +79,7 @@ digraph cfg {
"capture_by_ref#4375601249296069049.1d794578c048d96b25fb1e90dbaa8225_3" -> "capture_by_ref#4375601249296069049.1d794578c048d96b25fb1e90dbaa8225_2" ;
"capture_by_ref#4375601249296069049.1d794578c048d96b25fb1e90dbaa8225_4" [label="4: Call _fun_capture_by_ref::lambda_shared_lambda_lambda1.cpp:38:3_operator() \n n$1=*&x:int [line 38, column 3]\n _fun_capture_by_ref::lambda_shared_lambda_lambda1.cpp:38:3_operator()((_fun_capture_by_ref::lambda_shared_lambda_lambda1.cpp:38:3_operator(),(n$1 &x:int)):capture_by_ref::lambda_shared_lambda_lambda1.cpp:38:3) [line 38, column 3]\n " shape="box"]
"capture_by_ref#4375601249296069049.1d794578c048d96b25fb1e90dbaa8225_4" [label="4: Call _fun_capture_by_ref::lambda_shared_lambda_lambda1.cpp:38:3_operator() \n _fun_capture_by_ref::lambda_shared_lambda_lambda1.cpp:38:3_operator()((_fun_capture_by_ref::lambda_shared_lambda_lambda1.cpp:38:3_operator(),&x):capture_by_ref::lambda_shared_lambda_lambda1.cpp:38:3) [line 38, column 3]\n " shape="box"]
"capture_by_ref#4375601249296069049.1d794578c048d96b25fb1e90dbaa8225_4" -> "capture_by_ref#4375601249296069049.1d794578c048d96b25fb1e90dbaa8225_3" ;
@ -140,7 +140,7 @@ digraph cfg {
"capture_this_explicit#Capture#(13194085360619722149).2dba35a78268b10ad413414cc832a8f0_3" -> "capture_this_explicit#Capture#(13194085360619722149).2dba35a78268b10ad413414cc832a8f0_2" ;
"capture_this_explicit#Capture#(13194085360619722149).2dba35a78268b10ad413414cc832a8f0_4" [label="4: DeclStmt \n n$2=*&this:Capture* [line 55, column 19]\n *&0$?%__sil_tmpSIL_materialize_temp__n$1:Capture::capture_this_explicit::lambda_shared_lambda_lambda1.cpp:55:19=(_fun_Capture::capture_this_explicit::lambda_shared_lambda_lambda1.cpp:55:19_operator(),(n$2 &this:Capture*)) [line 55, column 19]\n _fun_Capture::capture_this_explicit::lambda_shared_lambda_lambda1.cpp:55:19_(&lambda:Capture::capture_this_explicit::lambda_shared_lambda_lambda1.cpp:55:19*,&0$?%__sil_tmpSIL_materialize_temp__n$1:Capture::capture_this_explicit::lambda_shared_lambda_lambda1.cpp:55:19&) [line 55, column 19]\n " shape="box"]
"capture_this_explicit#Capture#(13194085360619722149).2dba35a78268b10ad413414cc832a8f0_4" [label="4: DeclStmt \n *&0$?%__sil_tmpSIL_materialize_temp__n$1:Capture::capture_this_explicit::lambda_shared_lambda_lambda1.cpp:55:19=(_fun_Capture::capture_this_explicit::lambda_shared_lambda_lambda1.cpp:55:19_operator(),&this) [line 55, column 19]\n _fun_Capture::capture_this_explicit::lambda_shared_lambda_lambda1.cpp:55:19_(&lambda:Capture::capture_this_explicit::lambda_shared_lambda_lambda1.cpp:55:19*,&0$?%__sil_tmpSIL_materialize_temp__n$1:Capture::capture_this_explicit::lambda_shared_lambda_lambda1.cpp:55:19&) [line 55, column 19]\n " shape="box"]
"capture_this_explicit#Capture#(13194085360619722149).2dba35a78268b10ad413414cc832a8f0_4" -> "capture_this_explicit#Capture#(13194085360619722149).2dba35a78268b10ad413414cc832a8f0_3" ;
@ -170,7 +170,7 @@ digraph cfg {
"capture_this_with_equal#Capture#(805776379555510952).ecd73e9a4e2bef0d060a242b61508f10_3" -> "capture_this_with_equal#Capture#(805776379555510952).ecd73e9a4e2bef0d060a242b61508f10_2" ;
"capture_this_with_equal#Capture#(805776379555510952).ecd73e9a4e2bef0d060a242b61508f10_4" [label="4: DeclStmt \n n$2=*&this:Capture* [line 65, column 19]\n *&0$?%__sil_tmpSIL_materialize_temp__n$1:Capture::capture_this_with_equal::lambda_shared_lambda_lambda1.cpp:65:19=(_fun_Capture::capture_this_with_equal::lambda_shared_lambda_lambda1.cpp:65:19_operator(),(n$2 &this:Capture*)) [line 65, column 19]\n _fun_Capture::capture_this_with_equal::lambda_shared_lambda_lambda1.cpp:65:19_(&lambda:Capture::capture_this_with_equal::lambda_shared_lambda_lambda1.cpp:65:19*,&0$?%__sil_tmpSIL_materialize_temp__n$1:Capture::capture_this_with_equal::lambda_shared_lambda_lambda1.cpp:65:19&) [line 65, column 19]\n " shape="box"]
"capture_this_with_equal#Capture#(805776379555510952).ecd73e9a4e2bef0d060a242b61508f10_4" [label="4: DeclStmt \n *&0$?%__sil_tmpSIL_materialize_temp__n$1:Capture::capture_this_with_equal::lambda_shared_lambda_lambda1.cpp:65:19=(_fun_Capture::capture_this_with_equal::lambda_shared_lambda_lambda1.cpp:65:19_operator(),&this) [line 65, column 19]\n _fun_Capture::capture_this_with_equal::lambda_shared_lambda_lambda1.cpp:65:19_(&lambda:Capture::capture_this_with_equal::lambda_shared_lambda_lambda1.cpp:65:19*,&0$?%__sil_tmpSIL_materialize_temp__n$1:Capture::capture_this_with_equal::lambda_shared_lambda_lambda1.cpp:65:19&) [line 65, column 19]\n " shape="box"]
"capture_this_with_equal#Capture#(805776379555510952).ecd73e9a4e2bef0d060a242b61508f10_4" -> "capture_this_with_equal#Capture#(805776379555510952).ecd73e9a4e2bef0d060a242b61508f10_3" ;
@ -185,7 +185,7 @@ digraph cfg {
"capture_this_with_auto#Capture#(15696525048884093218).38be242109186a45cc282c38962c68e2_3" -> "capture_this_with_auto#Capture#(15696525048884093218).38be242109186a45cc282c38962c68e2_2" ;
"capture_this_with_auto#Capture#(15696525048884093218).38be242109186a45cc282c38962c68e2_4" [label="4: DeclStmt \n n$2=*&this:Capture* [line 69, column 19]\n *&0$?%__sil_tmpSIL_materialize_temp__n$1:Capture::capture_this_with_auto::lambda_shared_lambda_lambda1.cpp:69:19=(_fun_Capture::capture_this_with_auto::lambda_shared_lambda_lambda1.cpp:69:19_operator(),(n$2 &this:Capture*)) [line 69, column 19]\n _fun_Capture::capture_this_with_auto::lambda_shared_lambda_lambda1.cpp:69:19_(&lambda:Capture::capture_this_with_auto::lambda_shared_lambda_lambda1.cpp:69:19*,&0$?%__sil_tmpSIL_materialize_temp__n$1:Capture::capture_this_with_auto::lambda_shared_lambda_lambda1.cpp:69:19&) [line 69, column 19]\n " shape="box"]
"capture_this_with_auto#Capture#(15696525048884093218).38be242109186a45cc282c38962c68e2_4" [label="4: DeclStmt \n *&0$?%__sil_tmpSIL_materialize_temp__n$1:Capture::capture_this_with_auto::lambda_shared_lambda_lambda1.cpp:69:19=(_fun_Capture::capture_this_with_auto::lambda_shared_lambda_lambda1.cpp:69:19_operator(),&this) [line 69, column 19]\n _fun_Capture::capture_this_with_auto::lambda_shared_lambda_lambda1.cpp:69:19_(&lambda:Capture::capture_this_with_auto::lambda_shared_lambda_lambda1.cpp:69:19*,&0$?%__sil_tmpSIL_materialize_temp__n$1:Capture::capture_this_with_auto::lambda_shared_lambda_lambda1.cpp:69:19&) [line 69, column 19]\n " shape="box"]
"capture_this_with_auto#Capture#(15696525048884093218).38be242109186a45cc282c38962c68e2_4" -> "capture_this_with_auto#Capture#(15696525048884093218).38be242109186a45cc282c38962c68e2_3" ;

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