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[asan] Improve moving of non-instrumented allocas

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In r242510, non-instrumented allocas are now moved into the first basic block.  This patch limits that to only move allocas that are present *after* the first instrumented one (i.e. only move allocas up).  A testcase was updated to show behavior in these two cases.  Without the patch, an alloca could be moved down, and could cause an invalid IR.

Differential Revision: http://reviews.llvm.org/D11339



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242883 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Kuba Brecka
2015-07-22 10:25:38 +00:00
parent f020cb2f75
commit a5812d5bbf
2 changed files with 31 additions and 12 deletions
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25
test/Instrumentation/AddressSanitizer/debug_info_noninstrumented_alloca.ll
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@@ -9,18 +9,31 @@ target triple = "x86_64-apple-macosx10.10.0"
define i32 @foo() sanitize_address {
entry:
; Won't be instrumented because of asan-skip-promotable-allocas.
%non_instrumented1 = alloca i32, align 4
; Regular alloca, will get instrumented (forced by the ptrtoint below).
%instrumented = alloca i32, align 4
; Won't be instrumented because of asan-skip-promotable-allocas.
%non_instrumented = alloca i32, align 4
store i32 0, i32* %non_instrumented, align 4
%value = load i32, i32* %non_instrumented, align 4
%non_instrumented2 = alloca i32, align 4
%ptr = ptrtoint i32* %instrumented to i64
ret i32 %value
br label %bb0
bb0:
; Won't be instrumented because of asan-skip-promotable-allocas.
%non_instrumented3 = alloca i32, align 4
%ptr = ptrtoint i32* %instrumented to i32
br label %bb1
bb1:
ret i32 %ptr
}
; CHECK: entry:
; CHECK: %non_instrumented = alloca i32, align 4
; CHECK: %non_instrumented1 = alloca i32, align 4
; CHECK: %non_instrumented2 = alloca i32, align 4
; CHECK: load i32, i32* @__asan_option_detect_stack_use_after_return
; CHECK: bb0:
; CHECK: %non_instrumented3 = alloca i32, align 4