[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
diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index eb245b3..fdb1b18 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -484,6 +484,8 @@
return false;
case llvm::Triple::xcore:
+ case llvm::Triple::wasm32:
+ case llvm::Triple::wasm64:
return true;
}
}
@@ -1553,6 +1555,25 @@
}
}
+/// Get the (LLVM) name of the WebAssembly cpu we are targeting.
+static StringRef getWebAssemblyTargetCPU(const ArgList &Args) {
+ // If we have -mcpu=, use that.
+ if (Arg *A = Args.getLastArg(options::OPT_mcpu_EQ)) {
+ StringRef CPU = A->getValue();
+
+#ifdef __wasm__
+ // Handle "native" by examining the host. "native" isn't meaningful when
+ // cross compiling, so only support this when the host is also WebAssembly.
+ if (CPU == "native")
+ return llvm::sys::getHostCPUName();
+#endif
+
+ return CPU;
+ }
+
+ return "generic";
+}
+
static std::string getCPUName(const ArgList &Args, const llvm::Triple &T,
bool FromAs = false) {
switch (T.getArch()) {
@@ -1625,6 +1646,10 @@
case llvm::Triple::r600:
case llvm::Triple::amdgcn:
return getR600TargetGPU(Args);
+
+ case llvm::Triple::wasm32:
+ case llvm::Triple::wasm64:
+ return getWebAssemblyTargetCPU(Args);
}
}
@@ -2074,6 +2099,24 @@
Features.push_back("+reserve-x18");
}
+static void getWebAssemblyTargetFeatures(const ArgList &Args,
+ std::vector<const char *> &Features) {
+ for (const Arg *A : Args.filtered(options::OPT_m_wasm_Features_Group)) {
+ StringRef Name = A->getOption().getName();
+ A->claim();
+
+ // Skip over "-m".
+ assert(Name.startswith("m") && "Invalid feature name.");
+ Name = Name.substr(1);
+
+ bool IsNegative = Name.startswith("no-");
+ if (IsNegative)
+ Name = Name.substr(3);
+
+ Features.push_back(Args.MakeArgString((IsNegative ? "-" : "+") + Name));
+ }
+}
+
static void getTargetFeatures(const Driver &D, const llvm::Triple &Triple,
const ArgList &Args, ArgStringList &CmdArgs,
bool ForAS) {
@@ -2111,6 +2154,10 @@
case llvm::Triple::x86_64:
getX86TargetFeatures(D, Triple, Args, Features);
break;
+ case llvm::Triple::wasm32:
+ case llvm::Triple::wasm64:
+ getWebAssemblyTargetFeatures(Args, Features);
+ break;
}
// Find the last of each feature.
@@ -2590,9 +2637,15 @@
static bool shouldUseFramePointerForTarget(const ArgList &Args,
const llvm::Triple &Triple) {
- // XCore never wants frame pointers, regardless of OS.
- if (Triple.getArch() == llvm::Triple::xcore) {
+ switch (Triple.getArch()) {
+ case llvm::Triple::xcore:
+ case llvm::Triple::wasm32:
+ case llvm::Triple::wasm64:
+ // XCore never wants frame pointers, regardless of OS.
+ // WebAssembly never wants frame pointers.
return false;
+ default:
+ break;
}
if (Triple.isOSLinux()) {