From 97ca3066410be348997b863d336290a0db959359 Mon Sep 17 00:00:00 2001
From: Alexey Samsonov <samsonov@google.com>
Date: Mon, 17 Sep 2012 09:12:39 +0000
Subject: [PATCH] [Sanitizer] Hoist functions to get/set stack size and re-exec
 from memory-sanitizer branch to sanitizer_common

llvm-svn: 164020
---
 .../lib/sanitizer_common/sanitizer_common.h   | 12 +++++++----
 .../lib/sanitizer_common/sanitizer_linux.cc   | 20 +++++++++++++++++++
 .../lib/sanitizer_common/sanitizer_mac.cc     |  4 ++++
 .../lib/sanitizer_common/sanitizer_posix.cc   | 14 +++++++++++++
 .../lib/sanitizer_common/sanitizer_win.cc     | 13 ++++++++++++
 5 files changed, 59 insertions(+), 4 deletions(-)

diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_common.h b/compiler-rt/lib/sanitizer_common/sanitizer_common.h
index 544f8e4aa611..c4d236447a74 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_common.h
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_common.h
@@ -112,12 +112,16 @@ uptr ReadFileToBuffer(const char *file_name, char **buff,
 // in '*buff_size'.
 void *MapFileToMemory(const char *file_name, uptr *buff_size);
 
-const char *GetEnv(const char *name);
-const char *GetPwd();
-
-// Other
+// OS
 void DisableCoreDumper();
 void DumpProcessMap();
+const char *GetEnv(const char *name);
+const char *GetPwd();
+void ReExec();
+bool StackSizeIsUnlimited();
+void SetStackSizeLimitInBytes(uptr limit);
+
+// Other
 void SleepForSeconds(int seconds);
 void SleepForMillis(int millis);
 int Atexit(void (*function)(void));
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_linux.cc b/compiler-rt/lib/sanitizer_common/sanitizer_linux.cc
index 853be7a73034..a280a8bcaa73 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_linux.cc
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_linux.cc
@@ -164,6 +164,26 @@ const char *GetEnv(const char *name) {
   return 0;  // Not found.
 }
 
+void ReExec() {
+  static const int kMaxArgv = 100;
+  InternalScopedBuffer<char*> argv(kMaxArgv + 1);
+  static char *buff;
+  uptr buff_size = 0;
+  ReadFileToBuffer("/proc/self/cmdline", &buff, &buff_size, 1024 * 1024);
+  argv[0] = buff;
+  int argc, i;
+  for (argc = 1, i = 1; ; i++) {
+    if (buff[i] == 0) {
+      if (buff[i+1] == 0) break;
+      argv[argc] = &buff[i+1];
+      CHECK_LE(argc, kMaxArgv);  // FIXME: make this more flexible.
+      argc++;
+    }
+  }
+  argv[argc] = 0;
+  execv(argv[0], argv.data());
+}
+
 // ----------------- sanitizer_procmaps.h
 MemoryMappingLayout::MemoryMappingLayout() {
   proc_self_maps_buff_len_ =
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_mac.cc b/compiler-rt/lib/sanitizer_common/sanitizer_mac.cc
index ca55c8ce7644..202c4f702e15 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_mac.cc
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_mac.cc
@@ -110,6 +110,10 @@ const char *GetEnv(const char *name) {
   return 0;
 }
 
+void ReExec() {
+  UNIMPLEMENTED();
+}
+
 // ----------------- sanitizer_procmaps.h
 
 MemoryMappingLayout::MemoryMappingLayout() {
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_posix.cc b/compiler-rt/lib/sanitizer_common/sanitizer_posix.cc
index 143fcb0036c0..e3f851611ecc 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_posix.cc
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_posix.cc
@@ -138,6 +138,20 @@ void DisableCoreDumper() {
   setrlimit(RLIMIT_CORE, &nocore);
 }
 
+bool StackSizeIsUnlimited() {
+  struct rlimit rlim;
+  CHECK_EQ(0, getrlimit(RLIMIT_STACK, &rlim));
+  return (rlim.rlim_cur == (uptr)-1);
+}
+
+void SetStackSizeLimitInBytes(uptr limit) {
+  struct rlimit rlim;
+  rlim.rlim_cur = limit;
+  rlim.rlim_max = limit;
+  CHECK_EQ(0, setrlimit(RLIMIT_STACK, &rlim));
+  CHECK(!StackSizeIsUnlimited());
+}
+
 void SleepForSeconds(int seconds) {
   sleep(seconds);
 }
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_win.cc b/compiler-rt/lib/sanitizer_common/sanitizer_win.cc
index b2ddd61c615b..680184f26662 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_win.cc
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_win.cc
@@ -109,6 +109,19 @@ void DisableCoreDumper() {
   UNIMPLEMENTED();
 }
 
+void ReExec() {
+  UNIMPLEMENTED();
+}
+
+bool StackSizeIsUnlimited() {
+  UNIMPLEMENTED();
+  return false;
+}
+
+void SetStackSizeLimitInBytes(uptr limit) {
+  UNIMPLEMENTED();
+}
+
 void SleepForSeconds(int seconds) {
   Sleep(seconds * 1000);
 }