[compiler-rt][profile] Use encapsulation symbols for Wasm format

Use `InstrProfilingPlatformLinux.c` for Wasm as well as Wasm format
has encapsulation symbols (`__start_` and `__stop_`) similar to ELF.
This unlocks several additional profile features like value profiling.

Author: kateinoigakukun

compiler-rt/lib/profile/InstrProfilingPlatformLinux.c

@@ -6,11 +6,11 @@
 |*
 \*===----------------------------------------------------------------------===*/
 
-#if defined(__linux__) || defined(__FreeBSD__) || defined(__Fuchsia__) || \
-    (defined(__sun__) && defined(__svr4__)) || defined(__NetBSD__) || \
-    defined(_AIX)
+#if defined(__linux__) || defined(__FreeBSD__) || defined(__Fuchsia__) ||      \
+    (defined(__sun__) && defined(__svr4__)) || defined(__NetBSD__) ||          \
+    defined(_AIX) || defined(__wasm__)
 
-#if !defined(_AIX)
+#if !defined(_AIX) && !defined(__wasm__)
 #include <elf.h>
 #include <link.h>
 #endif

compiler-rt/lib/profile/InstrProfilingPlatformOther.c

@@ -8,7 +8,8 @@
 
 #if !defined(__APPLE__) && !defined(__linux__) && !defined(__FreeBSD__) &&     \
     !defined(__Fuchsia__) && !(defined(__sun__) && defined(__svr4__)) &&       \
-    !defined(__NetBSD__) && !defined(_WIN32) && !defined(_AIX)
+    !defined(__NetBSD__) && !defined(_WIN32) && !defined(_AIX) &&              \
+    !defined(__wasm__)
 
 #include <stdlib.h>
 #include <stdio.h>

llvm/lib/Transforms/Instrumentation/InstrProfiling.cpp

@@ -1406,9 +1406,10 @@ static inline Constant *getFuncAddrForProfData(Function *Fn) {
 
 static bool needsRuntimeRegistrationOfSectionRange(const Triple &TT) {
   // compiler-rt uses linker support to get data/counters/name start/end for
-  // ELF, COFF, Mach-O and XCOFF.
+  // ELF, COFF, Mach-O, XCOFF, and Wasm.
   if (TT.isOSBinFormatELF() || TT.isOSBinFormatCOFF() ||
-      TT.isOSBinFormatMachO() || TT.isOSBinFormatXCOFF())
+      TT.isOSBinFormatMachO() || TT.isOSBinFormatXCOFF() ||
+      TT.isOSBinFormatWasm())
     return false;
 
   return true;

llvm/test/Instrumentation/InstrProfiling/profiling.ll

@@ -114,11 +114,6 @@ declare void @llvm.instrprof.increment(ptr, i64, i32, i32)
 ; PS:   %[[REG:.*]] = load i32, ptr @__llvm_profile_runtime
 ; XCOFF-NOT: define .* __llvm_profile_runtime_user
 
-; WASM:      define internal void @__llvm_profile_register_functions() unnamed_addr {
-; WASM-NEXT:   call void @__llvm_profile_register_function(ptr @__profd_foo)
-; WASM-NEXT:   call void @__llvm_profile_register_function(ptr @__profd_foo_weak)
-; WASM:        call void @__llvm_profile_register_names_function(ptr @__llvm_prf_nm
-; WASM-NEXT:   ret void
-; WASM-NEXT: }
+; WASM-NOT:   internal void @__llvm_profile_register_functions()
 
 ; XCOFF-NOT:  internal void @__llvm_profile_register_functions()