Implement setStackSize on Windows

src/libutil/current-process.cc

@@ -59,15 +59,15 @@ unsigned int getMaxCPU()
 //////////////////////////////////////////////////////////////////////
 
 
-#ifndef _WIN32
-rlim_t savedStackSize = 0;
+size_t savedStackSize = 0;
 
-void setStackSize(rlim_t stackSize)
+void setStackSize(size_t stackSize)
 {
+    #ifndef _WIN32
     struct rlimit limit;
     if (getrlimit(RLIMIT_STACK, &limit) == 0 && limit.rlim_cur < stackSize) {
         savedStackSize = limit.rlim_cur;
-        limit.rlim_cur = std::min(stackSize, limit.rlim_max);
+        limit.rlim_cur = std::min(static_cast<rlim_t>(stackSize), limit.rlim_max);
         if (setrlimit(RLIMIT_STACK, &limit) != 0) {
             logger->log(
                 lvlError,
@@ -81,8 +81,31 @@ void setStackSize(rlim_t stackSize)
             );
         }
     }
+    #else
+    ULONG_PTR stackLow, stackHigh;
+    GetCurrentThreadStackLimits(&stackLow, &stackHigh);
+    ULONG maxStackSize = stackHigh - stackLow;
+    ULONG currStackSize = 0;
+    // This retrieves the current promised stack size
+    SetThreadStackGuarantee(&currStackSize);
+    if (currStackSize < stackSize) {
+        savedStackSize = currStackSize;
+        ULONG newStackSize = std::min(static_cast<ULONG>(stackSize), maxStackSize);
+        if (SetThreadStackGuarantee(&newStackSize) == 0) {
+            logger->log(
+                lvlError,
+                HintFmt(
+                    "Failed to increase stack size from %1% to %2% (maximum allowed stack size: %3%): %4%",
+                    savedStackSize,
+                    stackSize,
+                    maxStackSize,
+                    std::to_string(GetLastError())
+                ).str()
+            );
+        }
+    }
+    #endif
 }
-#endif
 
 void restoreProcessContext(bool restoreMounts)
 {

src/libutil/current-process.hh

@@ -17,12 +17,10 @@ namespace nix {
  */
 unsigned int getMaxCPU();
 
-#ifndef _WIN32 // TODO implement on Windows, if needed.
 /**
  * Change the stack size.
  */
-void setStackSize(rlim_t stackSize);
-#endif
+void setStackSize(size_t stackSize);
 
 /**
  * Restore the original inherited Unix process context (such as signal

src/nix/local.mk

@@ -30,6 +30,11 @@ nix_LIBS = libexpr libmain libfetchers libstore libutil libcmd
 
 nix_LDFLAGS = $(THREAD_LDFLAGS) $(SODIUM_LIBS) $(EDITLINE_LIBS) $(BOOST_LDFLAGS) $(LOWDOWN_LIBS)
 
+ifdef HOST_WINDOWS
+  # Increase the default reserved stack size to 65 MB so Nix doesn't run out of space
+  nix_LDFLAGS += -Wl,--stack,$(shell echo $$((65 * 1024 * 1024)))
+endif
+
 $(foreach name, \
   nix-build nix-channel nix-collect-garbage nix-copy-closure nix-daemon nix-env nix-hash nix-instantiate nix-prefetch-url nix-shell nix-store, \
   $(eval $(call install-symlink, nix, $(bindir)/$(name))))

src/nix/main.cc

@@ -522,11 +522,9 @@ void mainWrapped(int argc, char * * argv)
 
 int main(int argc, char * * argv)
 {
-#ifndef _WIN32 // TODO implement on Windows
     // Increase the default stack size for the evaluator and for
     // libstdc++'s std::regex.
     nix::setStackSize(64 * 1024 * 1024);
-#endif
 
     return nix::handleExceptions(argv[0], [&]() {
         nix::mainWrapped(argc, argv);

tests/unit/libexpr/local.mk

@@ -38,3 +38,8 @@ libexpr-tests_LIBS = \
     libexpr libexprc libfetchers libstore libstorec libutil libutilc
 
 libexpr-tests_LDFLAGS := -lrapidcheck $(GTEST_LIBS) -lgmock
+
+ifdef HOST_WINDOWS
+  # Increase the default reserved stack size to 65 MB so Nix doesn't run out of space
+  libexpr-tests_LDFLAGS += -Wl,--stack,$(shell echo $$((65 * 1024 * 1024)))
+endif

tests/unit/libfetchers/local.mk

@@ -30,3 +30,8 @@ libfetchers-tests_LIBS = \
     libfetchers libstore libutil
 
 libfetchers-tests_LDFLAGS := -lrapidcheck $(GTEST_LIBS)
+
+ifdef HOST_WINDOWS
+  # Increase the default reserved stack size to 65 MB so Nix doesn't run out of space
+  libfetchers-tests_LDFLAGS += -Wl,--stack,$(shell echo $$((65 * 1024 * 1024)))
+endif

tests/unit/libstore/local.mk

@@ -31,3 +31,8 @@ libstore-tests_LIBS = \
     libstore libstorec libutil libutilc
 
 libstore-tests_LDFLAGS := -lrapidcheck $(GTEST_LIBS)
+
+ifdef HOST_WINDOWS
+  # Increase the default reserved stack size to 65 MB so Nix doesn't run out of space
+  libstore-tests_LDFLAGS += -Wl,--stack,$(shell echo $$((65 * 1024 * 1024)))
+endif

tests/unit/libutil/local.mk

@@ -27,6 +27,11 @@ libutil-tests_LIBS = libutil-test-support libutil libutilc
 
 libutil-tests_LDFLAGS := -lrapidcheck $(GTEST_LIBS)
 
+ifdef HOST_WINDOWS
+  # Increase the default reserved stack size to 65 MB so Nix doesn't run out of space
+  libutil-tests_LDFLAGS += -Wl,--stack,$(shell echo $$((65 * 1024 * 1024)))
+endif
+
 check: $(d)/data/git/check-data.sh.test
 
 $(eval $(call run-test,$(d)/data/git/check-data.sh))