| ; 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 |
| ; RUN: opt -passes=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 ptr, ptr @__safestack_unsafe_stack_ptr |
| ; CHECK: getelementptr i8, ptr %[[USP]], i32 -16 |
| |
| %x0 = alloca i64, align 8 |
| %x1 = alloca i8, align 1 |
| %x2 = alloca i64, align 8 |
| |
| |
| call void @llvm.lifetime.start.p0(i64 8, ptr %x0) |
| call void @capture64(ptr %x0) |
| call void @llvm.lifetime.end.p0(i64 8, ptr %x0) |
| |
| call void @llvm.lifetime.start.p0(i64 1, ptr %x1) |
| call void @llvm.lifetime.start.p0(i64 8, ptr %x2) |
| call void @capture8(ptr %x1) |
| call void @capture64(ptr %x2) |
| call void @llvm.lifetime.end.p0(i64 1, ptr %x1) |
| call void @llvm.lifetime.end.p0(i64 8, ptr %x2) |
| |
| ; Test that i64 allocas share space. |
| ; CHECK: getelementptr i8, ptr %unsafe_stack_ptr, i32 -8 |
| ; CHECK: getelementptr i8, ptr %unsafe_stack_ptr, i32 -9 |
| ; CHECK: getelementptr i8, ptr %unsafe_stack_ptr, i32 -8 |
| |
| ret void |
| } |
| |
| declare void @llvm.lifetime.start.p0(i64, ptr nocapture) |
| declare void @llvm.lifetime.end.p0(i64, ptr nocapture) |
| declare void @capture8(ptr) |
| declare void @capture64(ptr) |
