[WebAssembly] Initial WebAssembly support in clang

This implements basic support for compiling (though not yet assembling
or linking) for a WebAssembly target. Note that ABI details are not yet
finalized, and may change.

Differential Revision: http://reviews.llvm.org/D12002

llvm-svn: 246814

1 files changed, 29 insertions, 0 deletions

diff --git a/clang/lib/Driver/ToolChains.cpp b/clang/lib/Driver/ToolChains.cpp
index 91317d601a8..d7989a7993f 100644
--- a/clang/lib/Driver/ToolChains.cpp
+++ b/clang/lib/Driver/ToolChains.cpp
@@ -3937,3 +3937,32 @@ Tool *SHAVEToolChain::buildAssembler() const {
   // assembler to the driver, except not the way it expects.
   llvm_unreachable("SHAVEToolChain can't buildAssembler");
 }
+
+bool WebAssembly::IsMathErrnoDefault() const { return false; }
+
+bool WebAssembly::IsObjCNonFragileABIDefault() const { return true; }
+
+bool WebAssembly::UseObjCMixedDispatch() const { return true; }
+
+bool WebAssembly::isPICDefault() const { return false; }
+
+bool WebAssembly::isPIEDefault() const { return false; }
+
+bool WebAssembly::isPICDefaultForced() const { return false; }
+
+bool WebAssembly::IsIntegratedAssemblerDefault() const { return true; }
+
+// TODO: Support Objective C stuff.
+bool WebAssembly::SupportsObjCGC() const { return false; }
+
+bool WebAssembly::hasBlocksRuntime() const { return false; }
+
+// TODO: Support profiling.
+bool WebAssembly::SupportsProfiling() const { return false; }
+
+void WebAssembly::addClangTargetOptions(const ArgList &DriverArgs,
+                                        ArgStringList &CC1Args) const {
+  if (DriverArgs.hasFlag(options::OPT_fuse_init_array,
+                         options::OPT_fno_use_init_array, true))
+    CC1Args.push_back("-fuse-init-array");
+}