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[SanitizerCoverage] Clang crashes if user declares `__sancov_lowest_stack` variable Summary: If the user declares or defines `__sancov_lowest_stack` with an unexpected type, then `getOrInsertGlobal` inserts a bitcast and the following cast fails: ``` Constant *SanCovLowestStackConstant = M.getOrInsertGlobal(SanCovLowestStackName, IntptrTy); SanCovLowestStack = cast<GlobalVariable>(SanCovLowestStackConstant); ``` This variable is a SanitizerCoverage implementation detail and the user should generally never have a need to access it, so we emit an error now. rdar://problem/44143130 Reviewers: morehouse Differential Revision: https://reviews.llvm.org/D57633 llvm-svn: 353100
2019-02-05 06:06:30 +08:00
; Ensure that we terminate with a useful error message (instead of crash) if the
; user declares `__sancov_lowest_stack` with an unexpected type.
; RUN: not opt < %s -sancov -sanitizer-coverage-level=1 \
; RUN: -sanitizer-coverage-stack-depth -S 2>&1 | FileCheck %s
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
; Wrong type: i32 instead of expected i64
@__sancov_lowest_stack = thread_local global i32 0
; CHECK: error: '__sancov_lowest_stack' should not be declared by the user