1 #include <petsc/private/petscimpl.h> 2 #include <petscvalgrind.h> 3 4 static PetscInt petsc_checkpointer_intensity = 1; 5 6 #undef __FUNCT__ 7 #define __FUNCT__ "PetscCheckPointerSetIntensity" 8 /*@ 9 PetscCheckPointerSetIntensity - An intense pointer check registers a signal handler and attempts to dereference to 10 confirm whether the address is valid. An intensity of 0 never uses signal handlers, 1 uses them when not in a "hot" 11 function, and intensity of 2 always uses a signal handler. 12 13 Not Collective 14 15 Input Arguments: 16 . intensity - how much to check pointers for validity 17 18 Level: advanced 19 20 .seealso: PetscCheckPointer(), PetscFunctionBeginHot 21 @*/ 22 PetscErrorCode PetscCheckPointerSetIntensity(PetscInt intensity) 23 { 24 25 PetscFunctionBegin; 26 switch (intensity) { 27 case 0: 28 case 1: 29 case 2: 30 petsc_checkpointer_intensity = intensity; 31 break; 32 default: SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"Intensity %D not in 0,1,2",intensity); 33 } 34 PetscFunctionReturn(0); 35 } 36 37 /* ---------------------------------------------------------------------------------------*/ 38 #if defined(PETSC_HAVE_SETJMP_H) && defined(PETSC_HAVE_SIGINFO_T) 39 #include <signal.h> 40 #include <setjmp.h> 41 PETSC_INTERN jmp_buf PetscSegvJumpBuf; 42 PETSC_INTERN void PetscSegv_sigaction(int, siginfo_t*, void *); 43 44 /*@C 45 PetscCheckPointer - Returns PETSC_TRUE if a pointer points to accessible data 46 47 Not Collective 48 49 Input Parameters: 50 + ptr - the pointer 51 - dtype - the type of data the pointer is suppose to point to 52 53 Level: developer 54 55 @*/ 56 PetscBool PetscCheckPointer(const void *ptr,PetscDataType dtype) 57 { 58 struct sigaction sa,oldsa; 59 PetscStack *stackp; 60 61 if (PETSC_RUNNING_ON_VALGRIND) return PETSC_TRUE; 62 if (!ptr) return PETSC_FALSE; 63 if (petsc_checkpointer_intensity < 1) return PETSC_TRUE; 64 65 /* Skip the verbose check if we are inside a hot function. */ 66 stackp = (PetscStack*)PetscThreadLocalGetValue(petscstack); 67 if (stackp && stackp->hotdepth > 0 && petsc_checkpointer_intensity < 2) return PETSC_TRUE; 68 69 sigemptyset(&sa.sa_mask); 70 sa.sa_sigaction = PetscSegv_sigaction; 71 sa.sa_flags = SA_SIGINFO; 72 sigaction(SIGSEGV, &sa, &oldsa); 73 74 if (setjmp(PetscSegvJumpBuf)) { 75 /* A segv was triggered in the code below hence we return with an error code */ 76 sigaction(SIGSEGV, &oldsa, NULL);/* reset old signal hanlder */ 77 return PETSC_FALSE; 78 } else { 79 switch (dtype) { 80 case PETSC_INT:{ 81 PETSC_UNUSED PetscInt x = (PetscInt)*(volatile PetscInt*)ptr; 82 break; 83 } 84 #if defined(PETSC_USE_COMPLEX) 85 case PETSC_SCALAR:{ /* C++ is seriously dysfunctional with volatile std::complex. */ 86 PetscReal xreal = ((volatile PetscReal*)ptr)[0],ximag = ((volatile PetscReal*)ptr)[1]; 87 PETSC_UNUSED volatile PetscScalar x = xreal + PETSC_i*ximag; 88 break; 89 } 90 #endif 91 case PETSC_REAL:{ 92 PETSC_UNUSED PetscReal x = *(volatile PetscReal*)ptr; 93 break; 94 } 95 case PETSC_BOOL:{ 96 PETSC_UNUSED PetscBool x = *(volatile PetscBool*)ptr; 97 break; 98 } 99 case PETSC_ENUM:{ 100 PETSC_UNUSED PetscEnum x = *(volatile PetscEnum*)ptr; 101 break; 102 } 103 case PETSC_CHAR:{ 104 PETSC_UNUSED char x = *(volatile char*)ptr; 105 break; 106 } 107 case PETSC_OBJECT:{ 108 PETSC_UNUSED volatile PetscClassId classid = ((PetscObject)ptr)->classid; 109 break; 110 } 111 default:; 112 } 113 } 114 sigaction(SIGSEGV, &oldsa, NULL); /* reset old signal hanlder */ 115 return PETSC_TRUE; 116 } 117 #else 118 PetscBool PetscCheckPointer(const void *ptr,PETSC_UNUSED PetscDataType dtype) 119 { 120 if (!ptr) return PETSC_FALSE; 121 return PETSC_TRUE; 122 } 123 #endif 124