| Evgeniy Stepanov | d99f80b | 2016-08-02 23:21:30 +0000 | [diff] [blame^] | 1 | ; Test that safestack layout reuses a region w/o fragmentation. |
| 2 | ; RUN: opt -safe-stack -S -mtriple=x86_64-pc-linux-gnu < %s -o - | FileCheck %s |
| 3 | |
| 4 | define void @f() safestack { |
| 5 | ; CHECK-LABEL: define void @f |
| 6 | entry: |
| 7 | ; CHECK: %[[USP:.*]] = load i8*, i8** @__safestack_unsafe_stack_ptr |
| 8 | ; CHECK: getelementptr i8, i8* %[[USP]], i32 -16 |
| 9 | |
| 10 | %x0 = alloca i64, align 8 |
| 11 | %x1 = alloca i8, align 1 |
| 12 | %x2 = alloca i64, align 8 |
| 13 | |
| 14 | %x0a = bitcast i64* %x0 to i8* |
| 15 | %x2a = bitcast i64* %x2 to i8* |
| 16 | |
| 17 | call void @llvm.lifetime.start(i64 4, i8* %x0a) |
| 18 | call void @capture64(i64* %x0) |
| 19 | call void @llvm.lifetime.end(i64 4, i8* %x0a) |
| 20 | |
| 21 | call void @llvm.lifetime.start(i64 4, i8* %x1) |
| 22 | call void @llvm.lifetime.start(i64 4, i8* %x2a) |
| 23 | call void @capture8(i8* %x1) |
| 24 | call void @capture64(i64* %x2) |
| 25 | call void @llvm.lifetime.end(i64 4, i8* %x1) |
| 26 | call void @llvm.lifetime.end(i64 4, i8* %x2a) |
| 27 | |
| 28 | ; Test that i64 allocas share space. |
| 29 | ; CHECK: getelementptr i8, i8* %unsafe_stack_ptr, i32 -8 |
| 30 | ; CHECK: getelementptr i8, i8* %unsafe_stack_ptr, i32 -9 |
| 31 | ; CHECK: getelementptr i8, i8* %unsafe_stack_ptr, i32 -8 |
| 32 | |
| 33 | ret void |
| 34 | } |
| 35 | |
| 36 | declare void @llvm.lifetime.start(i64, i8* nocapture) |
| 37 | declare void @llvm.lifetime.end(i64, i8* nocapture) |
| 38 | declare void @capture8(i8*) |
| 39 | declare void @capture64(i64*) |