pghs975uc
/
infer_clone
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
Branches Tags
${ item.name }
Create tag ${ searchTerm }
Create branch ${ searchTerm }
from 'b1698ab0ea'
${ noResults }
infer_clone/infer/tests/codetoanalyze/c/frontend/gotostmt/jjb1.c.dot

81 lines
5.0 KiB
Raw Normal View History Unescape

Weak Topological Order and Abstract Interpreter using it Reviewed By: jberdine Differential Revision: D7783487 fbshipit-source-id: 15b4c84e1
6 years ago
/* @generated */
digraph cfg {
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_1" [label="1: Start jjb1\nFormals: \nLocals: y:int x:int \n " color=yellow style=filled]
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_1" -> "jjb1.9d6085e324f8fe61c38e804980fa5cf1_19" ;
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_2" [label="2: Exit jjb1 \n " color=yellow style=filled]
[cfg] print dotty *after* pre-analysis Summary: Useful to understand the changes in the pre-analysis, or to inspect the CFG that checkers actually get. This means that the pre-analysis always runs when we output the dotty, but I don't really see a reason why not. In fact, we could probably *always* store the CFGs as pre-analysed. Reviewed By: mbouaziz Differential Revision: D13102952 fbshipit-source-id: 89f3102ec
6 years ago
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_3" [label="3: Return Stmt \n *&return:int=0 [line 29, column 3]\n APPLY_ABSTRACTION; [line 29, column 3]\n " shape="box"]
Weak Topological Order and Abstract Interpreter using it Reviewed By: jberdine Differential Revision: D7783487 fbshipit-source-id: 15b4c84e1
6 years ago
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_3" -> "jjb1.9d6085e324f8fe61c38e804980fa5cf1_2" ;
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_4" [label="4: Skip GotoLabel_L3 \n " color="gray"]
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_4" -> "jjb1.9d6085e324f8fe61c38e804980fa5cf1_3" ;
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_5" [label="5: + \n " ]
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_5" -> "jjb1.9d6085e324f8fe61c38e804980fa5cf1_4" ;
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_6" [label="6: BinaryOperatorStmt: Div \n n$1=*&x:int [line 14, column 7]\n " shape="box"]
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_6" -> "jjb1.9d6085e324f8fe61c38e804980fa5cf1_7" ;
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_6" -> "jjb1.9d6085e324f8fe61c38e804980fa5cf1_8" ;
[preanalysis] do not delay killing variables taken by reference Summary: Before, the liveness pre-analysis would place extra instructions in the CFG for either: 1. marking an `Ident.t` as dead, or 2. marking a `Pvar.t` as `= 0` But we have no way of marking pvars dead without setting them to 0. This is bad because setting pvars to 0 is not possible everywhere they are dead. Indeed, we only do it when we haven't seen their address being taken anyway. This prevents the following situation, recorded in our tests: ``` int address_taken() { int** x; int* y; int i = 7; y = &i; x = &y; // if we don't reason about taken addresses while adding nullify instructions, // we'll add // `nullify(y)` here and report a false NPE on the next line return **x; } ``` So we want to mark pvars as dead without nullifying them. This diff extends the `Remove_temps` SIL instruction to accept pvars as well, and so renames it to `ExitScope`. Reviewed By: da319 Differential Revision: D13102953 fbshipit-source-id: aa7f03a52
6 years ago
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_7" [label="7: Prune (true branch, if) \n PRUNE((n$1 / 2), true); [line 14, column 7]\n EXIT_SCOPE(n$1); [line 14, column 7]\n APPLY_ABSTRACTION; [line 14, column 7]\n " shape="invhouse"]
Weak Topological Order and Abstract Interpreter using it Reviewed By: jberdine Differential Revision: D7783487 fbshipit-source-id: 15b4c84e1
6 years ago
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_7" -> "jjb1.9d6085e324f8fe61c38e804980fa5cf1_16" ;
[preanalysis] do not delay killing variables taken by reference Summary: Before, the liveness pre-analysis would place extra instructions in the CFG for either: 1. marking an `Ident.t` as dead, or 2. marking a `Pvar.t` as `= 0` But we have no way of marking pvars dead without setting them to 0. This is bad because setting pvars to 0 is not possible everywhere they are dead. Indeed, we only do it when we haven't seen their address being taken anyway. This prevents the following situation, recorded in our tests: ``` int address_taken() { int** x; int* y; int i = 7; y = &i; x = &y; // if we don't reason about taken addresses while adding nullify instructions, // we'll add // `nullify(y)` here and report a false NPE on the next line return **x; } ``` So we want to mark pvars as dead without nullifying them. This diff extends the `Remove_temps` SIL instruction to accept pvars as well, and so renames it to `ExitScope`. Reviewed By: da319 Differential Revision: D13102953 fbshipit-source-id: aa7f03a52
6 years ago
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_8" [label="8: Prune (false branch, if) \n PRUNE(!(n$1 / 2), false); [line 14, column 7]\n EXIT_SCOPE(n$1); [line 14, column 7]\n APPLY_ABSTRACTION; [line 14, column 7]\n " shape="invhouse"]
Weak Topological Order and Abstract Interpreter using it Reviewed By: jberdine Differential Revision: D7783487 fbshipit-source-id: 15b4c84e1
6 years ago
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_8" -> "jjb1.9d6085e324f8fe61c38e804980fa5cf1_9" ;
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_9" [label="9: Skip GotoLabel_L1 \n " color="gray"]
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_9" -> "jjb1.9d6085e324f8fe61c38e804980fa5cf1_18" ;
[preanalysis] do not delay killing variables taken by reference Summary: Before, the liveness pre-analysis would place extra instructions in the CFG for either: 1. marking an `Ident.t` as dead, or 2. marking a `Pvar.t` as `= 0` But we have no way of marking pvars dead without setting them to 0. This is bad because setting pvars to 0 is not possible everywhere they are dead. Indeed, we only do it when we haven't seen their address being taken anyway. This prevents the following situation, recorded in our tests: ``` int address_taken() { int** x; int* y; int i = 7; y = &i; x = &y; // if we don't reason about taken addresses while adding nullify instructions, // we'll add // `nullify(y)` here and report a false NPE on the next line return **x; } ``` So we want to mark pvars as dead without nullifying them. This diff extends the `Remove_temps` SIL instruction to accept pvars as well, and so renames it to `ExitScope`. Reviewed By: da319 Differential Revision: D13102953 fbshipit-source-id: aa7f03a52
6 years ago
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_10" [label="10: Call _fun_print_int \n n$3=*&x:int [line 19, column 15]\n n$4=_fun_print_int(n$3:int) [line 19, column 5]\n EXIT_SCOPE(n$3,n$4); [line 19, column 5]\n APPLY_ABSTRACTION; [line 19, column 5]\n " shape="box"]
Weak Topological Order and Abstract Interpreter using it Reviewed By: jberdine Differential Revision: D7783487 fbshipit-source-id: 15b4c84e1
6 years ago
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_10" -> "jjb1.9d6085e324f8fe61c38e804980fa5cf1_9" ;
[preanalysis] do not delay killing variables taken by reference Summary: Before, the liveness pre-analysis would place extra instructions in the CFG for either: 1. marking an `Ident.t` as dead, or 2. marking a `Pvar.t` as `= 0` But we have no way of marking pvars dead without setting them to 0. This is bad because setting pvars to 0 is not possible everywhere they are dead. Indeed, we only do it when we haven't seen their address being taken anyway. This prevents the following situation, recorded in our tests: ``` int address_taken() { int** x; int* y; int i = 7; y = &i; x = &y; // if we don't reason about taken addresses while adding nullify instructions, // we'll add // `nullify(y)` here and report a false NPE on the next line return **x; } ``` So we want to mark pvars as dead without nullifying them. This diff extends the `Remove_temps` SIL instruction to accept pvars as well, and so renames it to `ExitScope`. Reviewed By: da319 Differential Revision: D13102953 fbshipit-source-id: aa7f03a52
6 years ago
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_11" [label="11: UnaryOperator \n n$5=*&x:int [line 18, column 5]\n *&x:int=(n$5 - 1) [line 18, column 5]\n EXIT_SCOPE(n$5); [line 18, column 5]\n " shape="box"]
Weak Topological Order and Abstract Interpreter using it Reviewed By: jberdine Differential Revision: D7783487 fbshipit-source-id: 15b4c84e1
6 years ago
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_11" -> "jjb1.9d6085e324f8fe61c38e804980fa5cf1_10" ;
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_12" [label="12: + \n " ]
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_12" -> "jjb1.9d6085e324f8fe61c38e804980fa5cf1_11" ;
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_13" [label="13: BinaryOperatorStmt: LE \n n$6=*&x:int [line 16, column 9]\n " shape="box"]
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_13" -> "jjb1.9d6085e324f8fe61c38e804980fa5cf1_14" ;
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_13" -> "jjb1.9d6085e324f8fe61c38e804980fa5cf1_15" ;
[preanalysis] do not delay killing variables taken by reference Summary: Before, the liveness pre-analysis would place extra instructions in the CFG for either: 1. marking an `Ident.t` as dead, or 2. marking a `Pvar.t` as `= 0` But we have no way of marking pvars dead without setting them to 0. This is bad because setting pvars to 0 is not possible everywhere they are dead. Indeed, we only do it when we haven't seen their address being taken anyway. This prevents the following situation, recorded in our tests: ``` int address_taken() { int** x; int* y; int i = 7; y = &i; x = &y; // if we don't reason about taken addresses while adding nullify instructions, // we'll add // `nullify(y)` here and report a false NPE on the next line return **x; } ``` So we want to mark pvars as dead without nullifying them. This diff extends the `Remove_temps` SIL instruction to accept pvars as well, and so renames it to `ExitScope`. Reviewed By: da319 Differential Revision: D13102953 fbshipit-source-id: aa7f03a52
6 years ago
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_14" [label="14: Prune (true branch, if) \n PRUNE((n$6 <= 0), true); [line 16, column 9]\n NULLIFY(&x); [line 16, column 9]\n NULLIFY(&y); [line 16, column 9]\n EXIT_SCOPE(n$6,x,y); [line 16, column 9]\n APPLY_ABSTRACTION; [line 16, column 9]\n " shape="invhouse"]
Weak Topological Order and Abstract Interpreter using it Reviewed By: jberdine Differential Revision: D7783487 fbshipit-source-id: 15b4c84e1
6 years ago
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_14" -> "jjb1.9d6085e324f8fe61c38e804980fa5cf1_4" ;
[preanalysis] do not delay killing variables taken by reference Summary: Before, the liveness pre-analysis would place extra instructions in the CFG for either: 1. marking an `Ident.t` as dead, or 2. marking a `Pvar.t` as `= 0` But we have no way of marking pvars dead without setting them to 0. This is bad because setting pvars to 0 is not possible everywhere they are dead. Indeed, we only do it when we haven't seen their address being taken anyway. This prevents the following situation, recorded in our tests: ``` int address_taken() { int** x; int* y; int i = 7; y = &i; x = &y; // if we don't reason about taken addresses while adding nullify instructions, // we'll add // `nullify(y)` here and report a false NPE on the next line return **x; } ``` So we want to mark pvars as dead without nullifying them. This diff extends the `Remove_temps` SIL instruction to accept pvars as well, and so renames it to `ExitScope`. Reviewed By: da319 Differential Revision: D13102953 fbshipit-source-id: aa7f03a52
6 years ago
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_15" [label="15: Prune (false branch, if) \n PRUNE(!(n$6 <= 0), false); [line 16, column 9]\n EXIT_SCOPE(n$6); [line 16, column 9]\n " shape="invhouse"]
Weak Topological Order and Abstract Interpreter using it Reviewed By: jberdine Differential Revision: D7783487 fbshipit-source-id: 15b4c84e1
6 years ago
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_15" -> "jjb1.9d6085e324f8fe61c38e804980fa5cf1_12" ;
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_16" [label="16: Skip GotoLabel_L0 \n " color="gray"]
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_16" -> "jjb1.9d6085e324f8fe61c38e804980fa5cf1_13" ;
[preanalysis] do not delay killing variables taken by reference Summary: Before, the liveness pre-analysis would place extra instructions in the CFG for either: 1. marking an `Ident.t` as dead, or 2. marking a `Pvar.t` as `= 0` But we have no way of marking pvars dead without setting them to 0. This is bad because setting pvars to 0 is not possible everywhere they are dead. Indeed, we only do it when we haven't seen their address being taken anyway. This prevents the following situation, recorded in our tests: ``` int address_taken() { int** x; int* y; int i = 7; y = &i; x = &y; // if we don't reason about taken addresses while adding nullify instructions, // we'll add // `nullify(y)` here and report a false NPE on the next line return **x; } ``` So we want to mark pvars as dead without nullifying them. This diff extends the `Remove_temps` SIL instruction to accept pvars as well, and so renames it to `ExitScope`. Reviewed By: da319 Differential Revision: D13102953 fbshipit-source-id: aa7f03a52
6 years ago
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_17" [label="17: Call _fun_print_int \n n$12=*&y:int [line 24, column 15]\n n$13=_fun_print_int(n$12:int) [line 24, column 5]\n EXIT_SCOPE(n$12,n$13); [line 24, column 5]\n APPLY_ABSTRACTION; [line 24, column 5]\n " shape="box"]
Weak Topological Order and Abstract Interpreter using it Reviewed By: jberdine Differential Revision: D7783487 fbshipit-source-id: 15b4c84e1
6 years ago
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_17" -> "jjb1.9d6085e324f8fe61c38e804980fa5cf1_16" ;
[preanalysis] do not delay killing variables taken by reference Summary: Before, the liveness pre-analysis would place extra instructions in the CFG for either: 1. marking an `Ident.t` as dead, or 2. marking a `Pvar.t` as `= 0` But we have no way of marking pvars dead without setting them to 0. This is bad because setting pvars to 0 is not possible everywhere they are dead. Indeed, we only do it when we haven't seen their address being taken anyway. This prevents the following situation, recorded in our tests: ``` int address_taken() { int** x; int* y; int i = 7; y = &i; x = &y; // if we don't reason about taken addresses while adding nullify instructions, // we'll add // `nullify(y)` here and report a false NPE on the next line return **x; } ``` So we want to mark pvars as dead without nullifying them. This diff extends the `Remove_temps` SIL instruction to accept pvars as well, and so renames it to `ExitScope`. Reviewed By: da319 Differential Revision: D13102953 fbshipit-source-id: aa7f03a52
6 years ago
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_18" [label="18: UnaryOperator \n n$14=*&y:int [line 23, column 5]\n *&y:int=(n$14 + 1) [line 23, column 5]\n EXIT_SCOPE(n$14); [line 23, column 5]\n " shape="box"]
Weak Topological Order and Abstract Interpreter using it Reviewed By: jberdine Differential Revision: D7783487 fbshipit-source-id: 15b4c84e1
6 years ago
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_18" -> "jjb1.9d6085e324f8fe61c38e804980fa5cf1_17" ;
[preanalysis] do not delay killing variables taken by reference Summary: Before, the liveness pre-analysis would place extra instructions in the CFG for either: 1. marking an `Ident.t` as dead, or 2. marking a `Pvar.t` as `= 0` But we have no way of marking pvars dead without setting them to 0. This is bad because setting pvars to 0 is not possible everywhere they are dead. Indeed, we only do it when we haven't seen their address being taken anyway. This prevents the following situation, recorded in our tests: ``` int address_taken() { int** x; int* y; int i = 7; y = &i; x = &y; // if we don't reason about taken addresses while adding nullify instructions, // we'll add // `nullify(y)` here and report a false NPE on the next line return **x; } ``` So we want to mark pvars as dead without nullifying them. This diff extends the `Remove_temps` SIL instruction to accept pvars as well, and so renames it to `ExitScope`. Reviewed By: da319 Differential Revision: D13102953 fbshipit-source-id: aa7f03a52
6 years ago
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_19" [label="19: UnaryOperator \n n$17=*&x:int [line 13, column 3]\n *&x:int=(n$17 + 1) [line 13, column 3]\n EXIT_SCOPE(n$17); [line 13, column 3]\n " shape="box"]
Weak Topological Order and Abstract Interpreter using it Reviewed By: jberdine Differential Revision: D7783487 fbshipit-source-id: 15b4c84e1
6 years ago
"jjb1.9d6085e324f8fe61c38e804980fa5cf1_19" -> "jjb1.9d6085e324f8fe61c38e804980fa5cf1_6" ;
}