Export public functions implemented in assembly on Windows.
Summary:
By default, symbols aren't visible outside of the module that defines
them. To make them visible, they must be exported. The easiest way to do
that is to embed an `-export:symname` directive into the object file.
Reviewers: mstorsjo, rnk
Subscribers: christof, cfe-commits
Differential Revision: https://reviews.llvm.org/D51508
git-svn-id: https://llvm.org/svn/llvm-project/libunwind/trunk@341232 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/src/assembly.h b/src/assembly.h
index 07b08f9..e98ad40 100644
--- a/src/assembly.h
+++ b/src/assembly.h
@@ -44,6 +44,7 @@
#if defined(__APPLE__)
#define SYMBOL_IS_FUNC(name)
+#define EXPORT_SYMBOL(name)
#define HIDDEN_SYMBOL(name) .private_extern name
#define NO_EXEC_STACK_DIRECTIVE
@@ -54,6 +55,7 @@
#else
#define SYMBOL_IS_FUNC(name) .type name,@function
#endif
+#define EXPORT_SYMBOL(name)
#define HIDDEN_SYMBOL(name) .hidden name
#if defined(__GNU__) || defined(__FreeBSD__) || defined(__Fuchsia__) || \
@@ -70,6 +72,11 @@
.scl 2 SEPARATOR \
.type 32 SEPARATOR \
.endef
+#define EXPORT_SYMBOL2(name) \
+ .section .drectve,"yn" SEPARATOR \
+ .ascii "-export:", #name, "\0" SEPARATOR \
+ .text
+#define EXPORT_SYMBOL(name) EXPORT_SYMBOL2(name)
#define HIDDEN_SYMBOL(name)
#define NO_EXEC_STACK_DIRECTIVE
@@ -82,6 +89,7 @@
#define DEFINE_LIBUNWIND_FUNCTION(name) \
.globl SYMBOL_NAME(name) SEPARATOR \
+ EXPORT_SYMBOL(name) SEPARATOR \
SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR \
SYMBOL_NAME(name):
