| ; Test that safestack layout reuses a region w/o fragmentation. |
| ; RUN: opt -safe-stack -safe-stack-coloring=1 -S -mtriple=x86_64-pc-linux-gnu < %s -o - | FileCheck %s |
| |
| define void @f() safestack { |
| ; CHECK-LABEL: define void @f |
| entry: |
| ; CHECK: %[[USP:.*]] = load i8*, i8** @__safestack_unsafe_stack_ptr |
| ; CHECK: getelementptr i8, i8* %[[USP]], i32 -16 |
| |
| %x0 = alloca i64, align 8 |
| %x1 = alloca i8, align 1 |
| %x2 = alloca i64, align 8 |
| |
| %x0a = bitcast i64* %x0 to i8* |
| %x2a = bitcast i64* %x2 to i8* |
| |
| call void @llvm.lifetime.start.p0i8(i64 4, i8* %x0a) |
| call void @capture64(i64* %x0) |
| call void @llvm.lifetime.end.p0i8(i64 4, i8* %x0a) |
| |
| call void @llvm.lifetime.start.p0i8(i64 4, i8* %x1) |
| call void @llvm.lifetime.start.p0i8(i64 4, i8* %x2a) |
| call void @capture8(i8* %x1) |
| call void @capture64(i64* %x2) |
| call void @llvm.lifetime.end.p0i8(i64 4, i8* %x1) |
| call void @llvm.lifetime.end.p0i8(i64 4, i8* %x2a) |
| |
| ; Test that i64 allocas share space. |
| ; CHECK: getelementptr i8, i8* %unsafe_stack_ptr, i32 -8 |
| ; CHECK: getelementptr i8, i8* %unsafe_stack_ptr, i32 -9 |
| ; CHECK: getelementptr i8, i8* %unsafe_stack_ptr, i32 -8 |
| |
| ret void |
| } |
| |
| declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) |
| declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) |
| declare void @capture8(i8*) |
| declare void @capture64(i64*) |