1 #include <petsc/private/petscimpl.h> 2 #include <petscvalgrind.h> 3 4 static PetscInt petsc_checkpointer_intensity = 1; 5 6 /*@ 7 PetscCheckPointerSetIntensity - An intense pointer check registers a signal handler and attempts to dereference to 8 confirm whether the address is valid. An intensity of 0 never uses signal handlers, 1 uses them when not in a "hot" 9 function, and intensity of 2 always uses a signal handler. 10 11 Not Collective 12 13 Input Arguments: 14 . intensity - how much to check pointers for validity 15 16 Options Database: 17 . -check_pointer_intensity - intensity (0, 1, or 2) 18 19 Level: advanced 20 21 .seealso: PetscCheckPointer(), PetscFunctionBeginHot() 22 @*/ 23 PetscErrorCode PetscCheckPointerSetIntensity(PetscInt intensity) 24 { 25 26 PetscFunctionBegin; 27 switch (intensity) { 28 case 0: 29 case 1: 30 case 2: 31 petsc_checkpointer_intensity = intensity; 32 break; 33 default: SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"Intensity %D not in 0,1,2",intensity); 34 } 35 PetscFunctionReturn(0); 36 } 37 38 /* ---------------------------------------------------------------------------------------*/ 39 40 #if defined(PETSC_HAVE_SETJMP_H) 41 #include <setjmp.h> 42 PETSC_INTERN jmp_buf PetscSegvJumpBuf; 43 PETSC_INTERN PetscBool PetscSegvJumpBuf_set; 44 45 /*@C 46 PetscCheckPointer - Returns PETSC_TRUE if a pointer points to accessible data 47 48 Not Collective 49 50 Input Parameters: 51 + ptr - the pointer 52 - dtype - the type of data the pointer is suppose to point to 53 54 Level: developer 55 56 .seealso: PetscCheckPointerSetIntensity() 57 @*/ 58 PetscBool PetscCheckPointer(const void *ptr,PetscDataType dtype) 59 { 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 if (petscstack && petscstack->hotdepth > 0 && petsc_checkpointer_intensity < 2) return PETSC_TRUE; 67 68 PetscSegvJumpBuf_set = PETSC_TRUE; 69 70 if (setjmp(PetscSegvJumpBuf)) { 71 /* A segv was triggered in the code below hence we return with an error code */ 72 PetscSegvJumpBuf_set = PETSC_FALSE; 73 return PETSC_FALSE; 74 } else { 75 switch (dtype) { 76 case PETSC_INT:{ 77 PETSC_UNUSED PetscInt x = (PetscInt)*(volatile PetscInt*)ptr; 78 break; 79 } 80 #if defined(PETSC_USE_COMPLEX) 81 case PETSC_SCALAR:{ /* C++ is seriously dysfunctional with volatile std::complex. */ 82 #if defined(PETSC_USE_CXXCOMPLEX) 83 PetscReal xreal = ((volatile PetscReal*)ptr)[0],ximag = ((volatile PetscReal*)ptr)[1]; 84 PETSC_UNUSED volatile PetscScalar x = xreal + PETSC_i*ximag; 85 #else 86 PETSC_UNUSED PetscScalar x = *(volatile PetscScalar*)ptr; 87 #endif 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 PetscSegvJumpBuf_set = PETSC_FALSE; 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