forked from OSchip/llvm-project
319 lines
8.6 KiB
LLVM
319 lines
8.6 KiB
LLVM
; RUN: opt -passes=attributor --attributor-disable=false -S < %s | FileCheck %s
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declare noalias i8* @malloc(i64)
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declare void @nocapture_func_frees_pointer(i8* nocapture)
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declare void @func_throws(...)
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declare void @sync_func(i8* %p)
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declare void @sync_will_return(i8* %p) willreturn
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declare void @no_sync_func(i8* nocapture %p) nofree nosync willreturn
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declare void @nofree_func(i8* nocapture %p) nofree nosync willreturn
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declare void @foo(i32* %p)
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declare void @foo_nounw(i32* %p) nounwind nofree
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declare i32 @no_return_call() noreturn
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declare void @free(i8* nocapture)
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declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) nounwind
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; TEST 1 - negative, pointer freed in another function.
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define void @test1() {
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%1 = tail call noalias i8* @malloc(i64 4)
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; CHECK: @malloc(i64 4)
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; CHECK-NEXT: @nocapture_func_frees_pointer(i8* noalias nocapture %1)
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tail call void @nocapture_func_frees_pointer(i8* %1)
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tail call void (...) @func_throws()
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tail call void @free(i8* %1)
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ret void
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}
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; TEST 2 - negative, call to a sync function.
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define void @test2() {
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%1 = tail call noalias i8* @malloc(i64 4)
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; CHECK: @malloc(i64 4)
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; CHECK-NEXT: @sync_func(i8* %1)
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tail call void @sync_func(i8* %1)
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tail call void @free(i8* %1)
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ret void
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}
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; TEST 3 - 1 malloc, 1 free
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define void @test3() {
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%1 = tail call noalias i8* @malloc(i64 4)
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; CHECK: %1 = alloca i8, i64 4
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; CHECK-NEXT: @no_sync_func(i8* noalias nocapture %1)
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tail call void @no_sync_func(i8* %1)
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; CHECK-NOT: @free(i8* %1)
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tail call void @free(i8* %1)
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ret void
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}
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declare noalias i8* @calloc(i64, i64)
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define void @test0() {
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%1 = tail call noalias i8* @calloc(i64 2, i64 4)
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; CHECK: %1 = alloca i8, i64 8
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; CHECK-NEXT: %calloc_bc = bitcast i8* %1 to i8*
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; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* %calloc_bc, i8 0, i64 8, i1 false)
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; CHECK-NEXT: @no_sync_func(i8* noalias nocapture %1)
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tail call void @no_sync_func(i8* %1)
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; CHECK-NOT: @free(i8* %1)
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tail call void @free(i8* %1)
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ret void
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}
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; TEST 4
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define void @test4() {
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%1 = tail call noalias i8* @malloc(i64 4)
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; CHECK: %1 = alloca i8, i64 4
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; CHECK-NEXT: @nofree_func(i8* noalias nocapture %1)
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tail call void @nofree_func(i8* %1)
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ret void
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}
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; TEST 5 - not all exit paths have a call to free, but all uses of malloc
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; are in nofree functions and are not captured
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define void @test5(i32) {
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%2 = tail call noalias i8* @malloc(i64 4)
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; CHECK: %2 = alloca i8, i64 4
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; CHECK-NEXT: icmp eq i32 %0, 0
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%3 = icmp eq i32 %0, 0
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br i1 %3, label %5, label %4
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4: ; preds = %1
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tail call void @nofree_func(i8* %2)
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br label %6
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5: ; preds = %1
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tail call void @free(i8* %2)
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; CHECK-NOT: @free(i8* %2)
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br label %6
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6: ; preds = %5, %4
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ret void
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}
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; TEST 6 - all exit paths have a call to free
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define void @test6(i32) {
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%2 = tail call noalias i8* @malloc(i64 4)
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; CHECK: %2 = alloca i8, i64 4
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; CHECK-NEXT: icmp eq i32 %0, 0
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%3 = icmp eq i32 %0, 0
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br i1 %3, label %5, label %4
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4: ; preds = %1
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tail call void @nofree_func(i8* %2)
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tail call void @free(i8* %2)
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; CHECK-NOT: @free(i8* %2)
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br label %6
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5: ; preds = %1
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tail call void @free(i8* %2)
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; CHECK-NOT: @free(i8* %2)
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br label %6
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6: ; preds = %5, %4
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ret void
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}
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; TEST 7 - free is dead.
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define void @test7() {
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%1 = tail call noalias i8* @malloc(i64 4)
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; CHECK: alloca i8, i64 4
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; CHECK-NEXT: tail call i32 @no_return_call()
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tail call i32 @no_return_call()
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; CHECK-NOT: @free(i8* %1)
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tail call void @free(i8* %1)
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ret void
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}
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; TEST 8 - Negative: bitcast pointer used in capture function
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define void @test8() {
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%1 = tail call noalias i8* @malloc(i64 4)
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; CHECK: %1 = tail call noalias i8* @malloc(i64 4)
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; CHECK-NEXT: @no_sync_func(i8* nocapture %1)
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tail call void @no_sync_func(i8* %1)
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%2 = bitcast i8* %1 to i32*
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store i32 10, i32* %2
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%3 = load i32, i32* %2
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tail call void @foo(i32* %2)
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; CHECK: @free(i8* %1)
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tail call void @free(i8* %1)
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ret void
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}
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; TEST 9 - FIXME: malloc should be converted.
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define void @test9() {
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%1 = tail call noalias i8* @malloc(i64 4)
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; CHECK: %1 = tail call noalias i8* @malloc(i64 4)
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; CHECK-NEXT: @no_sync_func(i8* nocapture %1)
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tail call void @no_sync_func(i8* %1)
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%2 = bitcast i8* %1 to i32*
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store i32 10, i32* %2
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%3 = load i32, i32* %2
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tail call void @foo_nounw(i32* %2)
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; CHECK: @free(i8* %1)
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tail call void @free(i8* %1)
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ret void
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}
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; TEST 10 - 1 malloc, 1 free
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define i32 @test10() {
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%1 = tail call noalias i8* @malloc(i64 4)
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; CHECK: %1 = alloca i8, i64 4
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; CHECK-NEXT: @no_sync_func(i8* noalias nocapture %1)
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tail call void @no_sync_func(i8* %1)
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%2 = bitcast i8* %1 to i32*
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store i32 10, i32* %2
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%3 = load i32, i32* %2
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; CHECK-NOT: @free(i8* %1)
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tail call void @free(i8* %1)
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ret i32 %3
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}
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define i32 @test_lifetime() {
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%1 = tail call noalias i8* @malloc(i64 4)
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; CHECK: %1 = alloca i8, i64 4
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; CHECK-NEXT: @no_sync_func(i8* noalias nocapture %1)
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tail call void @no_sync_func(i8* %1)
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call void @llvm.lifetime.start.p0i8(i64 4, i8* %1)
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%2 = bitcast i8* %1 to i32*
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store i32 10, i32* %2
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%3 = load i32, i32* %2
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; CHECK-NOT: @free(i8* %1)
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tail call void @free(i8* %1)
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ret i32 %3
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}
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; TEST 11
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; FIXME: should be ok
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define void @test11() {
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%1 = tail call noalias i8* @malloc(i64 4)
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; CHECK: @malloc(i64 4)
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; CHECK-NEXT: @sync_will_return(i8* %1)
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tail call void @sync_will_return(i8* %1)
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tail call void @free(i8* %1)
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ret void
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}
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; TEST 12
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define i32 @irreducible_cfg(i32 %0) {
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%2 = alloca i32, align 4
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%3 = alloca i32*, align 8
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%4 = alloca i32, align 4
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store i32 %0, i32* %2, align 4
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%5 = call noalias i8* @malloc(i64 4) #2
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; CHECK: alloca i8, i64 4
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; CHECK-NEXT: %6 = bitcast
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%6 = bitcast i8* %5 to i32*
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store i32* %6, i32** %3, align 8
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%7 = load i32*, i32** %3, align 8
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store i32 10, i32* %7, align 4
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%8 = load i32, i32* %2, align 4
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%9 = icmp eq i32 %8, 1
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br i1 %9, label %10, label %13
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10: ; preds = %1
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%11 = load i32, i32* %2, align 4
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%12 = add nsw i32 %11, 5
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store i32 %12, i32* %2, align 4
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br label %20
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13: ; preds = %1
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store i32 1, i32* %2, align 4
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br label %14
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14: ; preds = %20, %13
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%15 = load i32*, i32** %3, align 8
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%16 = load i32, i32* %15, align 4
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%17 = add nsw i32 %16, -1
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store i32 %17, i32* %15, align 4
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%18 = icmp ne i32 %16, 0
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br i1 %18, label %19, label %23
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19: ; preds = %14
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br label %20
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20: ; preds = %19, %10
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%21 = load i32, i32* %2, align 4
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%22 = add nsw i32 %21, 1
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store i32 %22, i32* %2, align 4
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br label %14
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23: ; preds = %14
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%24 = load i32*, i32** %3, align 8
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%25 = load i32, i32* %24, align 4
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store i32 %25, i32* %4, align 4
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%26 = load i32*, i32** %3, align 8
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%27 = bitcast i32* %26 to i8*
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call void @free(i8* %27) #2
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%28 = load i32*, i32** %3, align 8
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%29 = load i32, i32* %28, align 4
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ret i32 %29
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}
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define i32 @malloc_in_loop(i32 %0) {
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%2 = alloca i32, align 4
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%3 = alloca i32*, align 8
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store i32 %0, i32* %2, align 4
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br label %4
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4: ; preds = %8, %1
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%5 = load i32, i32* %2, align 4
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%6 = add nsw i32 %5, -1
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store i32 %6, i32* %2, align 4
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%7 = icmp sgt i32 %6, 0
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br i1 %7, label %8, label %11
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8: ; preds = %4
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%9 = call noalias i8* @malloc(i64 4)
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; CHECK: alloca i8, i64 4
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%10 = bitcast i8* %9 to i32*
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store i32* %10, i32** %3, align 8
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br label %4
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11: ; preds = %4
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ret i32 5
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}
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; Malloc/Calloc too large
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define i32 @test13() {
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%1 = tail call noalias i8* @malloc(i64 256)
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; CHECK: %1 = tail call noalias i8* @malloc(i64 256)
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; CHECK-NEXT: @no_sync_func(i8* noalias %1)
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tail call void @no_sync_func(i8* %1)
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%2 = bitcast i8* %1 to i32*
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store i32 10, i32* %2
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%3 = load i32, i32* %2
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tail call void @free(i8* %1)
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; CHECK: tail call void @free(i8* noalias %1)
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ret i32 %3
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}
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define void @test14() {
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%1 = tail call noalias i8* @calloc(i64 64, i64 4)
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; CHECK: %1 = tail call noalias i8* @calloc(i64 64, i64 4)
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; CHECK-NEXT: @no_sync_func(i8* noalias %1)
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tail call void @no_sync_func(i8* %1)
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tail call void @free(i8* %1)
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; CHECK: tail call void @free(i8* noalias %1)
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ret void
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}
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