[PATCH, libphobos] Committed Fiber/Thread support for StackGrowsUp

[Iain Buclaw]

Hi,

This patch fixes getStackBottom in core.thread to support targets
where the stack grows up, notably hppa configurations.  After other
fixes in the compiler, this allows core.thread unittests to pass, as
well as the garbage collector to work correctly on hppa-linux-gnu.

Bootstrapped and regression tested on x86_64-linux-gnu.

Committed to trunk as r268056.

-- 
Iain
---

diff --git a/libphobos/libdruntime/core/thread.d b/libphobos/libdruntime/core/thread.d
index 98a81425f47..e502072be7a 100644
--- a/libphobos/libdruntime/core/thread.d
+++ b/libphobos/libdruntime/core/thread.d
@@ -3254,7 +3254,9 @@ private void* getStackBottom() nothrow @nogc
         pthread_getattr_np(pthread_self(), &attr);
         pthread_attr_getstack(&attr, &addr, &size);
         pthread_attr_destroy(&attr);
-        return addr + size;
+        version (StackGrowsDown)
+            addr += size;
+        return addr;
     }
     else version (FreeBSD)
     {
@@ -3265,7 +3267,9 @@ private void* getStackBottom() nothrow @nogc
         pthread_attr_get_np(pthread_self(), &attr);
         pthread_attr_getstack(&attr, &addr, &size);
         pthread_attr_destroy(&attr);
-        return addr + size;
+        version (StackGrowsDown)
+            addr += size;
+        return addr;
     }
     else version (NetBSD)
     {
@@ -3276,7 +3280,9 @@ private void* getStackBottom() nothrow @nogc
         pthread_attr_get_np(pthread_self(), &attr);
         pthread_attr_getstack(&attr, &addr, &size);
         pthread_attr_destroy(&attr);
-        return addr + size;
+        version (StackGrowsDown)
+            addr += size;
+        return addr;
     }
     else version (Solaris)
     {
@@ -3293,7 +3299,9 @@ private void* getStackBottom() nothrow @nogc
         pthread_getattr_np(pthread_self(), &attr);
         pthread_attr_getstack(&attr, &addr, &size);
         pthread_attr_destroy(&attr);
-        return addr + size;
+        version (StackGrowsDown)
+            addr += size;
+        return addr;
     }
     else
         static assert(false, "Platform not supported.");
diff --git a/libphobos/libdruntime/gc/impl/conservative/gc.d b/libphobos/libdruntime/gc/impl/conservative/gc.d
index 1437846f48b..b7bb9b0c36f 100644
--- a/libphobos/libdruntime/gc/impl/conservative/gc.d
+++ b/libphobos/libdruntime/gc/impl/conservative/gc.d
@@ -30,12 +30,6 @@ module gc.impl.conservative.gc;
 //debug = INVARIANT;            // enable invariants
 //debug = PROFILE_API;          // profile API calls for config.profile > 1
 
-/*************** Configuration *********************/
-
-version = STACKGROWSDOWN;       // growing the stack means subtracting from the stack pointer
-                                // (use for Intel X86 CPUs)
-                                // else growing the stack means adding to the stack pointer
-
 /***************************************************/
 
 import gc.bits;