[WebAssembly] Make __attribute__((used)) not imply export.
Add an WASM_SYMBOL_NO_STRIP flag, so that __attribute__((used)) doesn't
need to imply exporting. When targeting Emscripten, have
WASM_SYMBOL_NO_STRIP imply exporting.
Differential Revision: https://reviews.llvm.org/D62542
llvm-svn: 370415
diff --git a/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyAsmBackend.cpp b/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyAsmBackend.cpp
index 70b409c..8314de4 100644
--- a/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyAsmBackend.cpp
+++ b/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyAsmBackend.cpp
@@ -31,10 +31,12 @@
class WebAssemblyAsmBackend final : public MCAsmBackend {
bool Is64Bit;
+ bool IsEmscripten;
public:
- explicit WebAssemblyAsmBackend(bool Is64Bit)
- : MCAsmBackend(support::little), Is64Bit(Is64Bit) {}
+ explicit WebAssemblyAsmBackend(bool Is64Bit, bool IsEmscripten)
+ : MCAsmBackend(support::little), Is64Bit(Is64Bit),
+ IsEmscripten(IsEmscripten) {}
unsigned getNumFixupKinds() const override {
return WebAssembly::NumTargetFixupKinds;
@@ -123,11 +125,11 @@
std::unique_ptr<MCObjectTargetWriter>
WebAssemblyAsmBackend::createObjectTargetWriter() const {
- return createWebAssemblyWasmObjectWriter(Is64Bit);
+ return createWebAssemblyWasmObjectWriter(Is64Bit, IsEmscripten);
}
} // end anonymous namespace
MCAsmBackend *llvm::createWebAssemblyAsmBackend(const Triple &TT) {
- return new WebAssemblyAsmBackend(TT.isArch64Bit());
+ return new WebAssemblyAsmBackend(TT.isArch64Bit(), TT.isOSEmscripten());
}
diff --git a/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyMCTargetDesc.h b/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyMCTargetDesc.h
index 7a9f59b..f2f3d20 100644
--- a/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyMCTargetDesc.h
+++ b/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyMCTargetDesc.h
@@ -38,7 +38,7 @@
MCAsmBackend *createWebAssemblyAsmBackend(const Triple &TT);
std::unique_ptr<MCObjectTargetWriter>
-createWebAssemblyWasmObjectWriter(bool Is64Bit);
+createWebAssemblyWasmObjectWriter(bool Is64Bit, bool IsEmscripten);
namespace WebAssembly {
enum OperandType {
diff --git a/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyWasmObjectWriter.cpp b/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyWasmObjectWriter.cpp
index f424b72..e7a599e 100644
--- a/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyWasmObjectWriter.cpp
+++ b/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyWasmObjectWriter.cpp
@@ -31,7 +31,7 @@
namespace {
class WebAssemblyWasmObjectWriter final : public MCWasmObjectTargetWriter {
public:
- explicit WebAssemblyWasmObjectWriter(bool Is64Bit);
+ explicit WebAssemblyWasmObjectWriter(bool Is64Bit, bool IsEmscripten);
private:
unsigned getRelocType(const MCValue &Target,
@@ -39,8 +39,9 @@
};
} // end anonymous namespace
-WebAssemblyWasmObjectWriter::WebAssemblyWasmObjectWriter(bool Is64Bit)
- : MCWasmObjectTargetWriter(Is64Bit) {}
+WebAssemblyWasmObjectWriter::WebAssemblyWasmObjectWriter(bool Is64Bit,
+ bool IsEmscripten)
+ : MCWasmObjectTargetWriter(Is64Bit, IsEmscripten) {}
static const MCSection *getFixupSection(const MCExpr *Expr) {
if (auto SyExp = dyn_cast<MCSymbolRefExpr>(Expr)) {
@@ -116,6 +117,6 @@
}
std::unique_ptr<MCObjectTargetWriter>
-llvm::createWebAssemblyWasmObjectWriter(bool Is64Bit) {
- return std::make_unique<WebAssemblyWasmObjectWriter>(Is64Bit);
+llvm::createWebAssemblyWasmObjectWriter(bool Is64Bit, bool IsEmscripten) {
+ return std::make_unique<WebAssemblyWasmObjectWriter>(Is64Bit, IsEmscripten);
}