Lower signatures exposing struct registers to byval struct pointers

test/Transforms/NaCl/simplify-struct-reg-signatures.ll

Index: test/Transforms/NaCl/simplify-struct-reg-signatures.ll
diff --git a/test/Transforms/NaCl/simplify-struct-reg-signatures.ll b/test/Transforms/NaCl/simplify-struct-reg-signatures.ll
new file mode 100644
index 0000000000000000000000000000000000000000..04ff60322f796dddd8f908f128cdf5e4d1c2cc20
--- /dev/null
+++ b/test/Transforms/NaCl/simplify-struct-reg-signatures.ll
@@ -0,0 +1,140 @@
+; RUN: opt %s -simplify-struct-reg-signatures -S | FileCheck %s
+
+%struct = type { i32, i32 }
+%rec_struct = type {%rec_struct*}
+%rec_problem_struct = type{void (%rec_problem_struct)*}
+%rec_pair_1 = type {%rec_pair_2*}
+%rec_pair_2 = type {%rec_pair_1*}
+
+; externs
+declare void @extern_func(%struct)
+declare %struct @struct_returning_extern(i32, %struct)
+
+define void @main(%struct* byval %ptr) {
+  %val = load %struct* %ptr
+  call void @extern_func(%struct %val)
+  ret void
+}
+
+define void @two_param_func(%struct %val1, %struct %val2) {
+  call void @extern_func(%struct %val1)
+  call void @extern_func(%struct %val2)
+  ret void
+}
+
+define i32 @another_func(i32 %a, %struct %str, i64 %b) {
+  call void @two_param_func(%struct %str, %struct %str)
+  call void @extern_func(%struct %str)
+  ret i32 0
+}
+
+define %struct @returns_struct(i32 %an_int, %struct %val) {
+  %tmp = call %struct @struct_returning_extern(i32 %an_int, %struct %val)
+  ret %struct %tmp
+}
+
+define i32 @lots_of_call_attrs() {
+  %tmp.0 = insertvalue %struct undef, i32 1, 0
+  %tmp.1 = insertvalue %struct %tmp.0, i32 2, 1
+  %ret = tail call zeroext i32 @another_func(i32 1, %struct %tmp.1, i64 2) readonly
+  ret i32 %ret
+}
+
+declare void @rec_struct_ok(%rec_struct*)
+declare void @rec_struct_mod(%rec_struct)
+
+define void @rec_call_sreg(%rec_problem_struct %r) {
+  %tmp = extractvalue %rec_problem_struct %r, 0
+  call void %tmp(%rec_problem_struct %r)
+  ret void
+}
+
+declare void @pairs(%rec_pair_1)
+
+%rec_returning = type { %rec_returning (%rec_returning)* }
+
+define %rec_returning @rec_returning_fun(%rec_returning %str) {
+  %tmp = extractvalue %rec_returning %str, 0
+  %ret = call %rec_returning %tmp(%rec_returning %str)
+  ret %rec_returning %ret
+}
+
+%direct_def = type { void(%struct)*, %struct }
+
+define void @direct_caller(%direct_def %def) {
+  %func = extractvalue %direct_def %def, 0
+  %param = extractvalue %direct_def %def, 1
+  call void %func(%struct %param)
+  ret void
+}
+
+; new type declarations:
+; CHECK: %struct = type { i32, i32 }
+; CHECK-NEXT: %rec_struct = type { %rec_struct* }
+; CHECK-NEXT: %rec_problem_struct.2 = type { void (%rec_problem_struct.2*)* }
+; CHECK-NEXT: %rec_pair_1 = type { %rec_pair_2* }
+; CHECK-NEXT: %rec_pair_2 = type { %rec_pair_1* }
+; CHECK-NEXT: %rec_returning.6 = type { void (%rec_returning.6*, %rec_returning.6*)* }
+; CHECK-NEXT: %direct_def.8 = type { void (%struct*)*, %struct }
+
+; verify that parameters are mapped correctly: single param, two, and combo
+; with non-struct regs
+; CHECK-NOT: declare void @extern_func(%struct)
+; CHECK-NOT: declare %struct @struct_returning_extern(i32, %struct)
+; CHECK: declare void @extern_func(%struct* byval)
+; CHECK: declare void @struct_returning_extern(%struct* sret, i32, %struct* byval)
+
+; CHECK: define void @two_param_func(%struct* byval %val1.ptr, %struct* byval %val2.ptr)
+; CHECK-NOT: define void @two_param_func(%struct %val1, %struct %val2)
+
+; CHECK: define i32 @another_func(i32 %a, %struct* byval %str.ptr, i64 %b)
+; CHECK: call void @two_param_func(%struct* byval %str.sreg.ptr, %struct* byval %str.sreg.ptr1)
+
+; verify return value and codegen
+; CHECK: define void @returns_struct(%struct* sret %retVal, i32 %an_int, %struct* byval %val.ptr)
+; CHECK-NEXT:  %val.sreg = load %struct* %val.ptr
+; CHECK-NEXT:  %1 = alloca %struct
+; CHECK-NEXT:  %val.sreg.ptr = alloca %struct
+; CHECK-NEXT:  store %struct %val.sreg, %struct* %val.sreg.ptr
+; CHECK-NEXT:  call void @struct_returning_extern(%struct* sret %1, i32 %an_int, %struct* byval %val.sreg.ptr)
+; CHECK-NEXT:  %tmp.sreg = load %struct* %1
+; CHECK-NEXT:  store %struct %tmp.sreg, %struct* %retVal
+; CHECK-NEXT:  ret void
+
+; verify attributes are copied
+; CHECK: %1 = tail call zeroext i32 @another_func(i32 1, %struct* byval %tmp.1.ptr, i64 2) #0
+; CHECK-NEXT: ret i32 %1
+
+; compliant recursive structs are kept as-is
+; CHECK: declare void @rec_struct_ok(%rec_struct*)
+; CHECK: declare void @rec_struct_mod(%rec_struct* byval)
+
+; non-compliant structs are correctly mapped and calls are changed
+; CHECK: define void @rec_call_sreg(%rec_problem_struct.2* byval %r.ptr)
+; CHECK: call void %tmp(%rec_problem_struct.2* byval %r.sreg.ptr)
+
+; pair structs
+; CHECK: declare void @pairs(%rec_pair_1* byval)
+; CHECK: define void @rec_returning_fun(%rec_returning.6* sret %retVal, %rec_returning.6* byval %str.ptr)
+; CHECK-NEXT: %str.sreg = load %rec_returning.6* %str.ptr
+; CHECK-NEXT:   %tmp = extractvalue %rec_returning.6 %str.sreg, 0
+; CHECK-NEXT:   %1 = alloca %rec_returning.6
+; CHECK-NEXT:   %str.sreg.ptr = alloca %rec_returning.6
+; CHECK-NEXT:   store %rec_returning.6 %str.sreg, %rec_returning.6* %str.sreg.ptr
+; CHECK-NEXT:   call void %tmp(%rec_returning.6* sret %1, %rec_returning.6* byval %str.sreg.ptr)
+; CHECK-NEXT:   %ret.sreg = load %rec_returning.6* %1
+; CHECK-NEXT:   store %rec_returning.6 %ret.sreg, %rec_returning.6* %retVal
+; CHECK-NEXT:   ret void
+
+; CHECK: define void @direct_caller(%direct_def.8* byval %def.ptr)
+; CHECK-NEXT:  %def.sreg = load %direct_def.8* %def.ptr
+; CHECK-NEXT:  %func = extractvalue %direct_def.8 %def.sreg, 0
+; CHECK-NEXT:  %param = extractvalue %direct_def.8 %def.sreg, 1
+; CHECK-NEXT:  %param.ptr = alloca %struct
+; CHECK-NEXT:  store %struct %param, %struct* %param.ptr
+; CHECK-NEXT:  call void %func(%struct* byval %param.ptr)
+; CHECK-NEXT:  ret void
+
+
+; this is at the end, corresponds to the call marked as readonly
+; CHECK: attributes #0 = { readonly }