Subzero: Replace global pointers to allocation functions

tests_lit/asan_tests/globalreplacement.ll

Index: tests_lit/asan_tests/globalreplacement.ll
diff --git a/tests_lit/asan_tests/globalreplacement.ll b/tests_lit/asan_tests/globalreplacement.ll
new file mode 100644
index 0000000000000000000000000000000000000000..d0f23d4fd11df1917e7826727377376eae4d8424
--- /dev/null
+++ b/tests_lit/asan_tests/globalreplacement.ll
@@ -0,0 +1,79 @@
+; Test that global pointers to allocation functions are replaced
+
+; REQUIRES: allow_dump
+
+; RUN: %p2i -i %s --args -verbose=global_init -threads=0 -fsanitize-address \
+; RUN:     -allow-externally-defined-symbols | FileCheck --check-prefix=DUMP %s
+
+declare external i32 @malloc(i32)
+declare external i32 @realloc(i32, i32)
+declare external i32 @calloc(i32, i32)
+declare external void @free(i32)
+declare external void @foo()
+
+@global_malloc = internal global i32 ptrtoint (i32 (i32)* @malloc to i32)
+@global_realloc = internal global i32 ptrtoint (i32 (i32, i32)* @realloc to i32)
+@global_calloc = internal global i32 ptrtoint (i32 (i32, i32)* @calloc to i32)
+@global_free = internal global i32 ptrtoint (void (i32)* @free to i32)
+@global_foo = internal global i32 ptrtoint (void ()* @foo to i32)
+
+@constant_malloc = internal constant i32 ptrtoint (i32 (i32)* @malloc to i32)
+@constant_realloc = internal constant i32 ptrtoint (i32 (i32, i32)* @realloc to i32)
+@constant_calloc = internal constant i32 ptrtoint (i32 (i32, i32)* @calloc to i32)
+@constant_free = internal constant i32 ptrtoint (void (i32)* @free to i32)
+@constant_foo = internal constant i32 ptrtoint (void ()* @foo to i32)
+
+@multiple_initializers = internal global <{i32, i32}> <{i32 ptrtoint (i32 (i32)* @malloc to i32), i32 ptrtoint (void (i32)* @free to i32)}>
+
+define void @func() {
+  ret void
+}
+
+; DUMP: Instrumented Globals
+; DUMP-NEXT: @__$rz_array
+; DUMP-NEXT: @__$rz_sizes
+; DUMP-NEXT: @__$rz0
+; DUMP-NEXT: @global_malloc = internal global i32
+; DUMP-SAME:   ptrtoint (i32 (i32)* @__asan_malloc to i32)
+; DUMP-NEXT: @__$rz1
+; DUMP-NEXT: @__$rz2
+; DUMP-NEXT: @global_realloc = internal global i32
+; DUMP-SAME:   ptrtoint (i32 (i32, i32)* @__asan_realloc to i32)
+; DUMP-NEXT: @__$rz3
+; DUMP-NEXT: @__$rz4
+; DUMP-NEXT: @global_calloc = internal global i32
+; DUMP-SAME:   ptrtoint (i32 (i32, i32)* @__asan_calloc to i32)
+; DUMP-NEXT: @__$rz5
+; DUMP-NEXT: @__$rz6
+; DUMP-NEXT: @global_free = internal global i32
+; DUMP-SAME:   ptrtoint (void (i32)* @__asan_free to i32)
+; DUMP-NEXT: @__$rz7
+; DUMP-NEXT: @__$rz8
+; DUMP-NEXT: @global_foo = internal global i32
+; DUMP-SAME:   ptrtoint (void ()* @foo to i32)
+; DUMP-NEXT: @__$rz9
+; DUMP-NEXT: @__$rz10
+; DUMP-NEXT: @constant_malloc = internal constant i32
+; DUMP-SAME:   ptrtoint (i32 (i32)* @__asan_malloc to i32)
+; DUMP-NEXT: @__$rz11
+; DUMP-NEXT: @__$rz12
+; DUMP-NEXT: @constant_realloc = internal constant i32
+; DUMP-SAME:   ptrtoint (i32 (i32, i32)* @__asan_realloc to i32)
+; DUMP-NEXT: @__$rz13
+; DUMP-NEXT: @__$rz14
+; DUMP-NEXT: @constant_calloc = internal constant i32
+; DUMP-SAME:   ptrtoint (i32 (i32, i32)* @__asan_calloc to i32)
+; DUMP-NEXT: @__$rz15
+; DUMP-NEXT: @__$rz16
+; DUMP-NEXT: @constant_free = internal constant i32
+; DUMP-SAME:   ptrtoint (void (i32)* @__asan_free to i32)
+; DUMP-NEXT: @__$rz17
+; DUMP-NEXT: @__$rz18
+; DUMP-NEXT: @constant_foo = internal constant i32
+; DUMP-SAME:   ptrtoint (void ()* @foo to i32)
+; DUMP-NEXT: @__$rz19
+; DUMP-NEXT: @__$rz20
+; DUMP-NEXT: @multiple_initializers = internal global <{ i32, i32 }>
+; DUMP-SAME:   <{ i32 ptrtoint (i32 (i32)* @__asan_malloc to i32),
+; DUMP-SAME:      i32 ptrtoint (void (i32)* @__asan_free to i32) }>
+; DUMP-NEXT: @__$rz21