PNaCl: Add ReplacePtrsWithInts pass for stripping out pointer types

test/Transforms/NaCl/replace-ptrs-with-ints.ll

+; RUN: opt %s -replace-ptrs-with-ints -S | FileCheck %s
+
+target datalayout = "p:32:32:32"
+
+
+%struct = type { i32, i32 }
+
+declare %struct* @addr_taken_func(%struct*)
+
+@addr_of_func = global %struct* (%struct*)* @addr_taken_func
+; CHECK: @addr_of_func = global %struct* (%struct*)* bitcast (i32 (i32)* @addr_taken_func to %struct* (%struct*)*)
+
+@blockaddr = global i8* blockaddress(@indirectbr, %l1)
+; CHECK: @blockaddr = global i8* blockaddress(@indirectbr, %l1)
+
+
+define i8* @pointer_arg(i8* %ptr, i64 %non_ptr) {
+  ret i8* %ptr
+}
+; CHECK: define i32 @pointer_arg(i32 %ptr, i64 %non_ptr) {
+; CHECK-NEXT: ret i32 %ptr
+; CHECK-NEXT: }
+
+
+declare i8* @declared_func(i8*, i64)
+; CHECK: declare i32 @declared_func(i32, i64)
+
+
+define void @self_reference(i8* %ptr) {
+entry:
+  br label %loop
+loop:
+  %x = phi i8* [ %x, %loop ], [ %ptr, %entry ]
+  br label %loop
+}
+; CHECK: define void @self_reference(i32 %ptr) {
+; CHECK: %x = phi i32 [ %x, %loop ], [ %ptr, %entry ]
+
+define i8* @phi_multiple_entry(i1 %arg, i8* %ptr) {
+entry:
+  br i1 %arg, label %done, label %done
+done:
+  %result = phi i8* [ %ptr, %entry ], [ %ptr, %entry ]
+  ret i8* %result
+}
+; CHECK: define i32 @phi_multiple_entry(i1 %arg, i32 %ptr) {
+; CHECK: %result = phi i32 [ %ptr, %entry ], [ %ptr, %entry ]
+
+
+define i8* @select(i1 %cond, i8* %val1, i8* %val2) {
+  %r = select i1 %cond, i8* %val1, i8* %val2
+  ret i8* %r
+}
+; CHECK: define i32 @select(i1 %cond, i32 %val1, i32 %val2) {
+; CHECK-NEXT: %r = select i1 %cond, i32 %val1, i32 %val2
+
+
+define i32* @ptrtoint_same_size(i32* %ptr) {
+  %a = ptrtoint i32* %ptr to i32
+  %b = add i32 %a, 4
+  %c = inttoptr i32 %b to i32*
+  ret i32* %c
+}
+; CHECK: define i32 @ptrtoint_same_size(i32 %ptr) {
+; CHECK-NEXT: %b = add i32 %ptr, 4
+; CHECK-NEXT: ret i32 %b
+
+
+define i32* @ptrtoint_different_size(i32* %ptr) {
+  %a = ptrtoint i32* %ptr to i64
+  %b = add i64 %a, 4
+  %c = inttoptr i64 %b to i32*
+  ret i32* %c
+}
+; CHECK: define i32 @ptrtoint_different_size(i32 %ptr) {
+; CHECK-NEXT: %a = zext i32 %ptr to i64
+; CHECK-NEXT: %b = add i64 %a, 4
+; CHECK-NEXT: %c = trunc i64 %b to i32
+; CHECK-NEXT: ret i32 %c
+
+
+define i32* @pointer_bitcast(i64* %ptr) {
+  %cast = bitcast i64* %ptr to i32*
+  ret i32* %cast
+}
+; CHECK: define i32 @pointer_bitcast(i32 %ptr) {
+; CHECK-NEXT: ret i32 %ptr
+
+; Same-type non-pointer bitcasts happen to be left alone by this pass.
+define i32 @no_op_bitcast(i32 %val) {
+  %val2 = bitcast i32 %val to i32
+  ret i32 %val2
+}
+; CHECK: define i32 @no_op_bitcast(i32 %val) {
+; CHECK-NEXT: %val2 = bitcast i32 %val to i32
+
+define i64 @kept_bitcast(double %d) {
+  %i = bitcast double %d to i64
+  ret i64 %i
+}
+; CHECK: define i64 @kept_bitcast(double %d) {
+; CHECK-NEXT: %i = bitcast double %d to i64
+
+
+define i32 @constant_pointer_null() {
+  %val = ptrtoint i32* null to i32
+  ret i32 %val
+}
+; CHECK: define i32 @constant_pointer_null() {
+; CHECK-NEXT: ret i32 0
+
+define i32 @constant_pointer_undef() {
+  %val = ptrtoint i32* undef to i32
+  ret i32 %val
+}
+; CHECK: define i32 @constant_pointer_undef() {
+; CHECK-NEXT: ret i32 undef
+
+define i16* @constant_pointer_null_load() {
+  %val = load i16** null
+  ret i16* %val
+}
+; CHECK: define i32 @constant_pointer_null_load() {
+; CHECK-NEXT: %.asptr = inttoptr i32 0 to i32*
+; CHECK-NEXT: %val = load i32* %.asptr
+
+
+define i8 @load(i8* %ptr) {
+  %x = load i8* %ptr
+  ret i8 %x
+}
+; CHECK: define i8 @load(i32 %ptr) {
+; CHECK-NEXT: %ptr.asptr = inttoptr i32 %ptr to i8*
+; CHECK-NEXT: %x = load i8* %ptr.asptr
+
+define void @store(i8* %ptr, i8 %val) {
+  store i8 %val, i8* %ptr
+  ret void
+}
+; CHECK: define void @store(i32 %ptr, i8 %val) {
+; CHECK-NEXT: %ptr.asptr = inttoptr i32 %ptr to i8*
+; CHECK-NEXT: store i8 %val, i8* %ptr.asptr
+
+
+define i8* @load_ptr(i8** %ptr) {
+  %x = load i8** %ptr
+  ret i8* %x
+}
+; CHECK: define i32 @load_ptr(i32 %ptr) {
+; CHECK-NEXT: %ptr.asptr = inttoptr i32 %ptr to i32*
+; CHECK-NEXT: %x = load i32* %ptr.asptr
+
+define void @store_ptr(i8** %ptr, i8* %val) {
+  store i8* %val, i8** %ptr
+  ret void
+}
+; CHECK: define void @store_ptr(i32 %ptr, i32 %val) {
+; CHECK-NEXT: %ptr.asptr = inttoptr i32 %ptr to i32*
+; CHECK-NEXT: store i32 %val, i32* %ptr.asptr
+
+
+define i8 @load_attrs(i8* %ptr) {
+  %x = load atomic volatile i8* %ptr seq_cst, align 128
+  ret i8 %x
+}
+; CHECK: define i8 @load_attrs(i32 %ptr) {
+; CHECK-NEXT: %ptr.asptr = inttoptr i32 %ptr to i8*
+; CHECK-NEXT: %x = load atomic volatile i8* %ptr.asptr seq_cst, align 128
+
+define void @store_attrs(i8* %ptr, i8 %val) {
+  store atomic volatile i8 %val, i8* %ptr singlethread release, align 256
+  ret void
+}
+; CHECK: define void @store_attrs(i32 %ptr, i8 %val) {
+; CHECK-NEXT: %ptr.asptr = inttoptr i32 %ptr to i8*
+; CHECK-NEXT: store atomic volatile i8 %val, i8* %ptr.asptr singlethread release, align 256
+
+
+define i32 @cmpxchg(i32* %ptr, i32 %a, i32 %b) {
+  %r = cmpxchg i32* %ptr, i32 %a, i32 %b seq_cst
+  ret i32 %r
+}
+; CHECK: define i32 @cmpxchg(i32 %ptr, i32 %a, i32 %b) {
+; CHECK-NEXT: %ptr.asptr = inttoptr i32 %ptr to i32*
+; CHECK-NEXT: %r = cmpxchg i32* %ptr.asptr, i32 %a, i32 %b seq_cst
+
+define i32 @atomicrmw(i32* %ptr, i32 %x) {
+  %r = atomicrmw add i32* %ptr, i32 %x seq_cst
+  ret i32 %r
+}
+; CHECK: define i32 @atomicrmw(i32 %ptr, i32 %x) {
+; CHECK-NEXT: %ptr.asptr = inttoptr i32 %ptr to i32*
+; CHECK-NEXT: %r = atomicrmw add i32* %ptr.asptr, i32 %x seq_cst
+
+
+define i8* @indirect_call(i8* (i8*)* %func, i8* %arg) {
+  %result = call i8* %func(i8* %arg)
+  ret i8* %result
+}
+; CHECK: define i32 @indirect_call(i32 %func, i32 %arg) {
+; CHECK-NEXT: %func.asfuncptr = inttoptr i32 %func to i32 (i32)*
+; CHECK-NEXT: %result = call i32 %func.asfuncptr(i32 %arg)
+; CHECK-NEXT: ret i32 %result
+
+
+; Test forwards reference
+define i8* @direct_call1(i8* %arg) {
+  %result = call i8* @direct_call2(i8* %arg)
+  ret i8* %result
+}
+; CHECK: define i32 @direct_call1(i32 %arg) {
+; CHECK-NEXT: %result = call i32 @direct_call2(i32 %arg)
+; CHECK-NEXT: ret i32 %result
+
+; Test backwards reference
+define i8* @direct_call2(i8* %arg) {
+  %result = call i8* @direct_call1(i8* %arg)
+  ret i8* %result
+}
+; CHECK: define i32 @direct_call2(i32 %arg) {
+; CHECK-NEXT: %result = call i32 @direct_call1(i32 %arg)
+; CHECK-NEXT: ret i32 %result
+
+
+@var = global i32 0
+
+define i32* @get_addr_of_global() {
+  ret i32* @var
+}
+; CHECK: define i32 @get_addr_of_global() {
+; CHECK-NEXT: %expanded = ptrtoint i32* @var to i32
+; CHECK-NEXT: ret i32 %expanded
+
+define %struct* (%struct*)* @get_addr_of_func() {
+  ret %struct* (%struct*)* @addr_taken_func
+}
+; CHECK: define i32 @get_addr_of_func() {
+; CHECK-NEXT: %expanded = ptrtoint i32 (i32)* @addr_taken_func to i32
+; CEHCK-NEXT: ret i32 %expanded
+
+
+define i32 @load_global() {
+  %val = load i32* @var
+  ret i32 %val
+}
+; CHECK: define i32 @load_global() {
+; CHECK-NEXT: %val = load i32* @var
+; CHECK-NEXT: ret i32 %val
+
+define i16 @load_global_bitcast() {
+  %ptr = bitcast i32* @var to i16*
+  %val = load i16* %ptr
+  ret i16 %val
+}
+; CHECK: define i16 @load_global_bitcast() {
+; CHECK-NEXT: %var.bc = bitcast i32* @var to i16*
+; CHECK-NEXT: %val = load i16* %var.bc
+; CHECK-NEXT: ret i16 %val
+
+
+declare void @receive_alloca(%struct* %ptr)
+
+define void @alloca_fixed() {
+  %buf = alloca %struct, align 128
+  call void @receive_alloca(%struct* %buf)
+  ret void
+}
+; CHECK: define void @alloca_fixed() {
+; CHECK-NEXT: %buf = alloca [8 x i8], align 128
+; CHECK-NEXT: %buf.asint = ptrtoint [8 x i8]* %buf to i32
+; CHECK-NEXT: call void @receive_alloca(i32 %buf.asint)
+
+define void @alloca_variable(i32 %size) {
+  %buf = alloca %struct, i32 %size
+  call void @receive_alloca(%struct* %buf)
+  ret void
+}
+; CHECK: define void @alloca_variable(i32 %size) {
+; CHECK-NEXT: %buf = alloca [8 x i8], i32 %size
+; CHECK-NEXT: %buf.asint = ptrtoint [8 x i8]* %buf to i32
+; CHECK-NEXT: call void @receive_alloca(i32 %buf.asint)
+
+define void @alloca_alignment_i32() {
+  %buf = alloca i32
+  ret void
+}
+; CHECK: void @alloca_alignment_i32() {
+; CHECK-NEXT: alloca [4 x i8], align 4
+
+define void @alloca_alignment_double() {
+  %buf = alloca double
+  ret void
+}
+; CHECK: void @alloca_alignment_double() {
+; CHECK-NEXT: alloca [8 x i8], align 8
+
+define void @alloca_lower_alignment() {
+  %buf = alloca i32, align 1
+  ret void
+}
+; CHECK: void @alloca_lower_alignment() {
+; CHECK-NEXT: alloca [4 x i8], align 1
+
+
+define i1 @compare(i8* %ptr1, i8* %ptr2) {
+  %cmp = icmp ult i8* %ptr1, %ptr2
+  ret i1 %cmp
+}
+; CHECK: define i1 @compare(i32 %ptr1, i32 %ptr2) {
+; CHECK-NEXT: %cmp = icmp ult i32 %ptr1, %ptr2
+
+
+declare i8* @llvm.some.intrinsic(i8* %ptr)
+
+define i8* @preserve_intrinsic_type(i8* %ptr) {
+  %result = call i8* @llvm.some.intrinsic(i8* %ptr)
+  ret i8* %result
+}
+; CHECK: define i32 @preserve_intrinsic_type(i32 %ptr) {
+; CHECK-NEXT: %ptr.asptr = inttoptr i32 %ptr to i8*
+; CHECK-NEXT: %result = call i8* @llvm.some.intrinsic(i8* %ptr.asptr)
+; CHECK-NEXT: %result.asint = ptrtoint i8* %result to i32
+; CHECK-NEXT: ret i32 %result.asint
+
+
+; Just check that the pass does not crash on inline asm.
+define i16* @inline_asm1(i8* %ptr) {
+  %val = call i16* asm "foo", "=r,r"(i8* %ptr)
+  ret i16* %val
+}
+
+define i16** @inline_asm2(i8** %ptr) {
+  %val = call i16** asm "foo", "=r,r"(i8** %ptr)
+  ret i16** %val
+}
+
+
+declare void @llvm.dbg.declare(metadata, metadata)
+declare void @llvm.dbg.value(metadata, i64, metadata)
+
+define void @debug_declare(i32 %val) {
+  ; We normally expect llvm.dbg.declare to be used on an alloca.
+  %var = alloca i32
+  tail call void @llvm.dbg.declare(metadata !{i32* %var}, metadata !{})
+  tail call void @llvm.dbg.declare(metadata !{i32 %val}, metadata !{})
+  ret void
+}
+; CHECK: define void @debug_declare(i32 %val) {
+; CHECK-NEXT: %var = alloca [4 x i8]
+; CHECK-NEXT: call void @llvm.dbg.declare(metadata !{[4 x i8]* %var}, metadata !0)
+; This case is currently not converted.
+; CHECK-NEXT: call void @llvm.dbg.declare(metadata !{null}, metadata !0)
+; CHECK-NEXT: ret void
+
+; For now, debugging info for values is lost.  replaceAllUsesWith()
+; does not work for metadata references -- it converts them to nulls.
+; This makes dbg.value too tricky to handle for now.
+define void @debug_value(i32 %val, i8* %ptr) {
+  tail call void @llvm.dbg.value(metadata !{i32 %val}, i64 1, metadata !{})
+  tail call void @llvm.dbg.value(metadata !{i8* %ptr}, i64 2, metadata !{})
+  ret void
+}
+; CHECK: define void @debug_value(i32 %val, i32 %ptr) {
+; CHECK-NEXT: call void @llvm.dbg.value(metadata !{null}, i64 1, metadata !0)
+; CHECK-NEXT: call void @llvm.dbg.value(metadata !{null}, i64 2, metadata !0)
+; CHECK-NEXT: ret void
+
+
+declare void @llvm.lifetime.start(i64 %size, i8* %ptr)
+
+; GVN can introduce the following horrible corner case of a lifetime
+; marker referencing a PHI node.  But we convert the phi to i32 type,
+; and lifetime.start doesn't work on an inttoptr converting an i32 phi
+; to a pointer.  Because of this, we just strip out all lifetime
+; markers.
+
+define void @alloca_lifetime_via_phi() {
+entry:
+  %buf = alloca i8
+  br label %block
+block:
+  %phi = phi i8* [ %buf, %entry ]
+  call void @llvm.lifetime.start(i64 -1, i8* %phi)
+  ret void
+}
+; CHECK: define void @alloca_lifetime_via_phi() {
+; CHECK: %phi = phi i32 [ %buf.asint, %entry ]
+; CHECK-NEXT: ret void
+
+define void @alloca_lifetime() {
+  %buf = alloca i8
+  call void @llvm.lifetime.start(i64 -1, i8* %buf)
+  ret void
+}
+; CHECK: define void @alloca_lifetime() {
+; CHECK-NEXT: %buf = alloca [1 x i8]
+; CHECK-NEXT: ret void
+
+define void @alloca_lifetime_via_bitcast() {
+  %buf = alloca i32
+  %buf_cast = bitcast i32* %buf to i8*
+  call void @llvm.lifetime.start(i64 -1, i8* %buf_cast)
+  ret void
+}
+; CHECK: define void @alloca_lifetime_via_bitcast() {
+; CHECK-NEXT: %buf = alloca [4 x i8]
+; CHECK-NEXT: ret void
+
+
+; "nocapture" and "noalias" only apply to pointers, so must be stripped.
+define void @nocapture_attr(i8* nocapture noalias %ptr) {
+  ret void
+}
+; CHECK: define void @nocapture_attr(i32 %ptr) {
+
+; "nounwind" should be preserved.
+define void @nounwind_func_attr() nounwind {
+  ret void
+}
+; CHECK: define void @nounwind_func_attr() [[NOUNWIND:#[0-9]+]] {
+
+define void @nounwind_call_attr() {
+  call void @nounwind_func_attr() nounwind
+  ret void
+}
+; CHECK: define void @nounwind_call_attr() {
+; CHECK: call void @nounwind_func_attr() {{.*}}[[NOUNWIND]]
+
+define fastcc void @fastcc_func() {
+  ret void
+}
+; CHECK: define fastcc void @fastcc_func() {
+
+define void @fastcc_call() {
+  call fastcc void @fastcc_func()
+  ret void
+}
+; CHECK: define void @fastcc_call() {
+; CHECK-NEXT: call fastcc void @fastcc_func()
+
+
+; Just check that the pass does not crash on getelementptr.  (The pass
+; should not depend unnecessarily on ExpandGetElementPtr having been
+; run.)
+define i8* @getelementptr(i8* %ptr) {
+  %gep = getelementptr i8* %ptr, i32 10
+  ret i8* %gep
+}
+
+; Just check that the pass does not crash on va_arg.
+define i32* @va_arg(i8* %valist) {
+  %r = va_arg i8* %valist, i32*
+  ret i32* %r
+}
+
+
+define void @indirectbr(i8* %addr) {
+  indirectbr i8* %addr, [ label %l1, label %l2 ]
+l1:
+  ret void
+l2:
+  ret void
+}
+; CHECK: define void @indirectbr(i32 %addr) {
+; CHECK-NEXT: %addr.asptr = inttoptr i32 %addr to i8*
+; CHECK-NEXT: indirectbr i8* %addr.asptr, [label %l1, label %l2]
+
+
+define i8* @invoke(i8* %val) {
+  %result = invoke i8* @direct_call1(i8* %val)
+      to label %cont unwind label %lpad
+cont:
+  ret i8* %result
+lpad:
+  %lp = landingpad { i8*, i32 } personality void (i8*)* @personality_func cleanup
+  %p = extractvalue { i8*, i32 } %lp, 0
+  %s = insertvalue { i8*, i32 } %lp, i8* %val, 0
+  ret i8* %p
+}
+; CHECK: define i32 @invoke(i32 %val) {
+; CHECK-NEXT: %result = invoke i32 @direct_call1(i32 %val)
+; CHECK-NEXT:         to label %cont unwind label %lpad
+; CHECK: %lp = landingpad { i8*, i32 } personality void (i8*)* bitcast (void (i32)* @personality_func to void (i8*)*)
+; CHECK: %p = extractvalue { i8*, i32 } %lp, 0
+; CHECK-NEXT: %p.asint = ptrtoint i8* %p to i32
+; CHECK-NEXT: %val.asptr = inttoptr i32 %val to i8*
+; CHECK-NEXT: %s = insertvalue { i8*, i32 } %lp, i8* %val.asptr, 0
+; CHECK-NEXT: ret i32 %p.asint
+
+define void @personality_func(i8* %arg) {
+  ret void
+}
+
+
+declare i32 @llvm.eh.typeid.for(i8*)
+
+@typeid = global i32 0
+
+; The argument here must be left as a bitcast, otherwise the backend
+; rejects it.
+define void @typeid_for() {
+  %bc = bitcast i32* @typeid to i8*
+  call i32 @llvm.eh.typeid.for(i8* %bc)
+  ret void
+}
+; CHECK: define void @typeid_for() {
+; CHECK-NEXT: %typeid.bc = bitcast i32* @typeid to i8*
+; CHECK-NEXT: call i32 @llvm.eh.typeid.for(i8* %typeid.bc)
+
+
+; CHECK: attributes {{.*}}[[NOUNWIND]] = { nounwind }