GH-120982: Add stack check assertions to generated interpreter code

Lib/test/test_generated_cases.py

@@ -151,6 +151,7 @@ def test_inst_one_pop(self):
             value = stack_pointer[-1];
             spam();
             stack_pointer += -1;
+            assert(WITHIN_STACK_BOUNDS());
             DISPATCH();
         }
     """
@@ -171,6 +172,7 @@ def test_inst_one_push(self):
             spam();
             stack_pointer[0] = res;
             stack_pointer += 1;
+            assert(WITHIN_STACK_BOUNDS());
             DISPATCH();
         }
     """
@@ -216,6 +218,7 @@ def test_binary_op(self):
             spam();
             stack_pointer[-2] = res;
             stack_pointer += -1;
+            assert(WITHIN_STACK_BOUNDS());
             DISPATCH();
         }
     """
@@ -337,6 +340,7 @@ def test_error_if_pop(self):
             if (cond) goto pop_2_label;
             stack_pointer[-2] = res;
             stack_pointer += -1;
+            assert(WITHIN_STACK_BOUNDS());
             DISPATCH();
         }
     """
@@ -360,6 +364,7 @@ def test_cache_effect(self):
             uint32_t extra = read_u32(&this_instr[2].cache);
             (void)extra;
             stack_pointer += -1;
+            assert(WITHIN_STACK_BOUNDS());
             DISPATCH();
         }
     """
@@ -425,6 +430,7 @@ def test_macro_instruction(self):
             }
             stack_pointer[-3] = res;
             stack_pointer += -2;
+            assert(WITHIN_STACK_BOUNDS());
             DISPATCH();
         }
 
@@ -459,6 +465,7 @@ def test_macro_instruction(self):
             res = op3(arg2, left, right);
             stack_pointer[-3] = res;
             stack_pointer += -2;
+            assert(WITHIN_STACK_BOUNDS());
             DISPATCH();
         }
     """
@@ -540,6 +547,7 @@ def test_array_input(self):
             below = stack_pointer[-2 - oparg*2];
             spam();
             stack_pointer += -2 - oparg*2;
+            assert(WITHIN_STACK_BOUNDS());
             DISPATCH();
         }
     """
@@ -564,6 +572,7 @@ def test_array_output(self):
             stack_pointer[-2] = below;
             stack_pointer[-1 + oparg*3] = above;
             stack_pointer += oparg*3;
+            assert(WITHIN_STACK_BOUNDS());
             DISPATCH();
         }
     """
@@ -586,6 +595,7 @@ def test_array_input_output(self):
             spam(values, oparg);
             stack_pointer[0] = above;
             stack_pointer += 1;
+            assert(WITHIN_STACK_BOUNDS());
             DISPATCH();
         }
     """
@@ -608,6 +618,7 @@ def test_array_error_if(self):
             extra = stack_pointer[-1 - oparg];
             if (oparg == 0) { stack_pointer += -1 - oparg; goto somewhere; }
             stack_pointer += -1 - oparg;
+            assert(WITHIN_STACK_BOUNDS());
             DISPATCH();
         }
     """
@@ -638,6 +649,7 @@ def test_cond_effect(self):
             if (oparg & 2) stack_pointer[-1 - (((oparg & 1) == 1) ? 1 : 0)] = output;
             stack_pointer[-1 - (((oparg & 1) == 1) ? 1 : 0) + ((oparg & 2) ? 1 : 0)] = zz;
             stack_pointer += -(((oparg & 1) == 1) ? 1 : 0) + ((oparg & 2) ? 1 : 0);
+            assert(WITHIN_STACK_BOUNDS());
             DISPATCH();
         }
     """
@@ -679,6 +691,7 @@ def test_macro_cond_effect(self):
             if (oparg) stack_pointer[-2] = extra;
             stack_pointer[-2 + ((oparg) ? 1 : 0)] = res;
             stack_pointer += -1 + ((oparg) ? 1 : 0);
+            assert(WITHIN_STACK_BOUNDS());
             DISPATCH();
         }
     """
@@ -712,6 +725,7 @@ def test_macro_push_push(self):
             stack_pointer[0] = val1;
             stack_pointer[1] = val2;
             stack_pointer += 2;
+            assert(WITHIN_STACK_BOUNDS());
             DISPATCH();
         }
         """

Python/ceval_macros.h

@@ -246,6 +246,8 @@ GETITEM(PyObject *v, Py_ssize_t i) {
 #define STACK_SHRINK(n)        BASIC_STACKADJ(-(n))
 #endif
 
+#define WITHIN_STACK_BOUNDS() \
+   (frame == &entry_frame || (STACK_LEVEL() >= 0 && STACK_LEVEL() <= STACK_SIZE()))
 
 /* Data access macros */
 #define FRAME_CO_CONSTS (_PyFrame_GetCode(frame)->co_consts)