r368101 - [WebAssembly] Lower ASan constructor priority on Emscripten

[Guanzhong Chen via cfe-commits]

Author: quantum
Date: Tue Aug  6 14:52:58 2019
New Revision: 368101

URL: http://llvm.org/viewvc/llvm-project?rev=368101&view=rev
Log:
[WebAssembly] Lower ASan constructor priority on Emscripten

Summary:
This change gives Emscripten the ability to use more than one constructor
priorities that runs before ASan. By convention, constructor priorites 0-100
are reserved for use by the system. ASan on Emscripten now uses priority 50,
leaving plenty of room for use by Emscripten before and after ASan.

This change is done in response to:
https://github.com/emscripten-core/emscripten/pull/9076#discussion_r310323723

Reviewers: kripken, tlively, aheejin

Reviewed By: tlively

Subscribers: cfe-commits, dschuff, sbc100, jgravelle-google, hiraditya, sunfish, llvm-commits

Tags: #llvm, #clang

Differential Revision: https://reviews.llvm.org/D65684

Added:
    cfe/trunk/test/CodeGen/asan-constructor.c

Added: cfe/trunk/test/CodeGen/asan-constructor.c
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CodeGen/asan-constructor.c?rev=368101&view=auto
==============================================================================
--- cfe/trunk/test/CodeGen/asan-constructor.c (added)
+++ cfe/trunk/test/CodeGen/asan-constructor.c Tue Aug  6 14:52:58 2019
@@ -0,0 +1,5 @@
+// RUN: %clang_cc1 -fsanitize=address -emit-llvm -o - %s | FileCheck %s
+// RUN: %clang_cc1 -triple wasm32-unknown-emscripten -fsanitize=address -emit-llvm -o - %s | FileCheck %s --check-prefix=EMSCRIPTEN
+
+// CHECK: @llvm.global_ctors = appending global [1 x { i32, void ()*, i8* }] [{ i32, void ()*, i8* } { i32 1, void ()* @asan.module_ctor, i8* null }]
+// EMSCRIPTEN: @llvm.global_ctors = appending global [1 x { i32, void ()*, i8* }] [{ i32, void ()*, i8* } { i32 50, void ()* @asan.module_ctor, i8* null }]