[llvm] r365916 - [FunctionAttrs] Add a test for "nofree" function attribute

[Hideto Ueno via llvm-commits]

Author: uenoku
Date: Fri Jul 12 09:29:14 2019
New Revision: 365916

URL: http://llvm.org/viewvc/llvm-project?rev=365916&view=rev
Log:
[FunctionAttrs] Add a test for "nofree" function attribute

This patch adds a test for nofree function attribute.

Added:
    llvm/trunk/test/Transforms/FunctionAttrs/nofree-attributor.ll

Added: llvm/trunk/test/Transforms/FunctionAttrs/nofree-attributor.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/FunctionAttrs/nofree-attributor.ll?rev=365916&view=auto
==============================================================================
--- llvm/trunk/test/Transforms/FunctionAttrs/nofree-attributor.ll (added)
+++ llvm/trunk/test/Transforms/FunctionAttrs/nofree-attributor.ll Fri Jul 12 09:29:14 2019
@@ -0,0 +1,163 @@
+; RUN: opt -functionattrs --disable-nofree-inference=false -S < %s | FileCheck %s
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+
+; Test cases specifically designed for the "nofree" function attribute.
+; We use FIXME's to indicate problems and missing attributes.
+
+; Free functions
+declare void @free(i8* nocapture) local_unnamed_addr #1
+declare noalias i8* @realloc(i8* nocapture, i64) local_unnamed_addr #0
+declare void @_ZdaPv(i8*) local_unnamed_addr #2
+
+
+; TEST 1 (positive case)
+; FIXME: missing "nofree"
+; CHECK: Function Attrs: noinline norecurse nounwind readnone uwtable
+; CHECK: define void @only_return() 
+define void @only_return() #0 {
+    ret void
+}
+
+
+; TEST 2 (nagative case)
+; Only free
+; void only_free(char* p) {
+;    free(p);
+; }
+
+; CHECK: Function Attrs: noinline nounwind uwtable
+; CHECK: define void @only_free(i8* nocapture) local_unnamed_addr 
+define void @only_free(i8* nocapture) local_unnamed_addr #0 {
+    tail call void @free(i8* %0) #1
+    ret void
+}
+
+
+; TEST 3 (nagative case)
+; Free occurs in same scc.
+; void free_in_scc1(char*p){
+;    free_in_scc2(p);
+; }
+; void free_in_scc2(char*p){
+;    free_in_scc1(p);
+;    free(p);
+; }
+
+
+; CHECK: Function Attrs: noinline nounwind uwtable
+; CHECK: define void @free_in_scc1(i8* nocapture) local_unnamed_addr 
+define void @free_in_scc1(i8* nocapture) local_unnamed_addr #0 {
+  tail call void @free_in_scc2(i8* %0) #1
+  ret void
+}
+
+
+; CHECK: Function Attrs: noinline nounwind uwtable
+; CHECK: define void @free_in_scc2(i8* nocapture) local_unnamed_addr 
+define void @free_in_scc2(i8*) local_unnamed_addr #0 {
+  tail call void @free_in_scc1(i8* %0)
+  tail call void @free(i8* %0) #1
+  ret void
+}
+
+
+; TEST 4 (positive case)
+; Free doesn't occur.
+; void mutual_recursion1(){
+;    mutual_recursion2();
+; }
+; void mutual_recursion2(){
+;     mutual_recursion1();
+; }
+
+
+; FIXME: missing "nofree"
+; CHECK: Function Attrs: noinline nounwind readnone uwtable
+; CHECK: define void @mutual_recursion1() 
+define void @mutual_recursion1() #0 {
+  call void @mutual_recursion2()
+  ret void
+}
+
+; FIXME: missing "nofree"
+; CHECK: Function Attrs: noinline nounwind readnone uwtable
+; CHECK: define void @mutual_recursion2() 
+define void @mutual_recursion2() #0 {
+  call void @mutual_recursion1()
+  ret void
+}
+
+
+; TEST 5
+; C++ delete operation (nagative case)
+; void delete_op (char p[]){
+;     delete [] p;
+; }
+
+; CHECK: Function Attrs: noinline nounwind uwtable
+; CHECK: define void @_Z9delete_opPc(i8*) local_unnamed_addr 
+define void @_Z9delete_opPc(i8*) local_unnamed_addr #0 {
+  %2 = icmp eq i8* %0, null
+  br i1 %2, label %4, label %3
+
+; <label>:3:                                      ; preds = %1
+  tail call void @_ZdaPv(i8* nonnull %0) #2
+  br label %4
+
+; <label>:4:                                      ; preds = %3, %1
+  ret void
+}
+
+
+; TEST 6 (negative case)
+; Call realloc
+; CHECK: Function Attrs: noinline nounwind uwtable
+; CHECK: define noalias i8* @call_realloc(i8* nocapture, i64) local_unnamed_addr 
+define noalias i8* @call_realloc(i8*nocapture, i64) local_unnamed_addr #0 {
+    %ret = tail call i8* @realloc(i8* %0, i64 %1) #2
+    ret i8* %ret
+}
+
+
+; TEST 7 (positive case)
+; Call function declaration with "nofree"
+
+declare void @nofree_function() nofree readnone #0
+
+; FIXME: missing "nofree"
+; Function Attrs: noinline nounwind readnone uwtable
+; CHECK: define void @call_nofree_function() 
+define void @call_nofree_function() #0 {
+    tail call void @nofree_function()
+    ret void
+}
+
+; TEST 8 (nagative case)
+; Call function declaration without "nofree"
+
+declare void @maybe_free() #0
+
+
+; CHECK: Function Attrs: noinline nounwind uwtable
+; CHECK: define void @call_maybe_free() 
+define void @call_maybe_free() #0 {
+    tail call void @maybe_free()
+    ret void
+}
+
+
+; TEST 9 (nagative case)
+; Call both of above functions
+
+; CHECK: Function Attrs: noinline nounwind uwtable
+; CHECK: define void @call_both() 
+define void @call_both() #0 {
+    tail call void @maybe_free()
+    tail call void @nofree_function()
+    ret void
+}
+
+
+attributes #0 = { nounwind uwtable noinline }
+attributes #1 = { nounwind }
+attributes #2 = { nobuiltin nounwind }