Revert "[no-wasm] Exclude trap-handler implementation"

This reverts commit 5d84b6cb9a.

Reason for revert: Breaks mac-arm64:
https://ci.chromium.org/p/v8/builders/ci/V8%20Mac%20-%20arm64%20-%20release/4636
https://chromium-swarm.appspot.com/task?id=5414a227cc3d6b10

Original change's description:
> [no-wasm] Exclude trap-handler implementation
>
> The trap handler is only needed for WebAssembly, hence it can be
> excluded in no-wasm builds (v8_enable_webassembly = false).
> This makes it easier to port WebAssembly to platforms that do not need
> to support WebAssembly.
>
> R=​ahaas@chromium.org, jkummerow@chromium.org
> CC=​johnx@google.com
>
> Bug: v8:11877
> Change-Id: I25c34c2c4f1122227047e13add532ee2b9f73d2f
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2953285
> Reviewed-by: Andreas Haas <ahaas@chromium.org>
> Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
> Commit-Queue: Clemens Backes <clemensb@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#75101}

Bug: v8:11877
Change-Id: I7a98341f6c03667c6400dced2bc69746011dd3d4
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2956868
Auto-Submit: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#75106}

BUILD.gn

@@ -3103,6 +3103,8 @@ v8_header_set("v8_internal_headers") {
     "src/tracing/trace-event.h",
     "src/tracing/traced-value.h",
     "src/tracing/tracing-category-observer.h",
+    "src/trap-handler/trap-handler-internal.h",
+    "src/trap-handler/trap-handler.h",
     "src/utils/address-map.h",
     "src/utils/allocation.h",
     "src/utils/bit-vector.h",
@@ -3150,8 +3152,6 @@ v8_header_set("v8_internal_headers") {
       "src/compiler/wasm-compiler.h",
       "src/debug/debug-wasm-objects-inl.h",
       "src/debug/debug-wasm-objects.h",
-      "src/trap-handler/trap-handler-internal.h",
-      "src/trap-handler/trap-handler.h",
       "src/wasm/baseline/liftoff-assembler-defs.h",
       "src/wasm/baseline/liftoff-assembler.h",
       "src/wasm/baseline/liftoff-compiler.h",
@@ -3294,19 +3294,16 @@ v8_header_set("v8_internal_headers") {
       "src/wasm/baseline/x64/liftoff-assembler-x64.h",
     ]
 
-    if (is_win) {
-      sources += [ "src/diagnostics/unwinding-info-win64.h" ]
-    }
-
-    if (v8_enable_webassembly) {
     # iOS Xcode simulator builds run on an x64 target. iOS and macOS are both
     # based on Darwin and thus POSIX-compliant to a similar degree.
-      if (is_linux || is_chromeos || is_mac || is_ios ||
-          target_os == "freebsd") {
+    if (is_linux || is_chromeos || is_mac || is_ios || target_os == "freebsd") {
       sources += [ "src/trap-handler/handler-inside-posix.h" ]
-      } else if (is_win) {
-        sources += [ "src/trap-handler/handler-inside-win.h" ]
     }
+    if (is_win) {
+      sources += [
+        "src/diagnostics/unwinding-info-win64.h",
+        "src/trap-handler/handler-inside-win.h",
+      ]
     }
   } else if (v8_current_cpu == "arm") {
     sources += [  ### gcmole(arch:arm) ###
@@ -3351,7 +3348,7 @@ v8_header_set("v8_internal_headers") {
     if (v8_control_flow_integrity) {
       sources += [ "src/execution/arm64/pointer-authentication-arm64.h" ]
     }
-    if (v8_enable_webassembly && current_cpu == "arm64" && is_mac) {
+    if (current_cpu == "arm64" && is_mac) {
       sources += [ "src/trap-handler/handler-inside-posix.h" ]
     }
     if (is_win) {
@@ -4071,6 +4068,9 @@ v8_source_set("v8_base_without_compiler") {
     "src/tracing/trace-event.cc",
     "src/tracing/traced-value.cc",
     "src/tracing/tracing-category-observer.cc",
+    "src/trap-handler/handler-inside.cc",
+    "src/trap-handler/handler-outside.cc",
+    "src/trap-handler/handler-shared.cc",
     "src/utils/address-map.cc",
     "src/utils/allocation.cc",
     "src/utils/bit-vector.cc",
@@ -4097,9 +4097,6 @@ v8_source_set("v8_base_without_compiler") {
       "src/debug/debug-wasm-objects.cc",
       "src/runtime/runtime-test-wasm.cc",
       "src/runtime/runtime-wasm.cc",
-      "src/trap-handler/handler-inside.cc",
-      "src/trap-handler/handler-outside.cc",
-      "src/trap-handler/handler-shared.cc",
       "src/wasm/baseline/liftoff-assembler.cc",
       "src/wasm/baseline/liftoff-compiler.cc",
       "src/wasm/function-body-decoder.cc",
@@ -4196,26 +4193,21 @@ v8_source_set("v8_base_without_compiler") {
       "src/regexp/x64/regexp-macro-assembler-x64.cc",
     ]
 
-    if (is_win) {
-      sources += [ "src/diagnostics/unwinding-info-win64.cc" ]
-    }
-
-    if (v8_enable_webassembly) {
     # iOS Xcode simulator builds run on an x64 target. iOS and macOS are both
     # based on Darwin and thus POSIX-compliant to a similar degree.
-      if (is_linux || is_chromeos || is_mac || is_ios ||
-          target_os == "freebsd") {
+    if (is_linux || is_chromeos || is_mac || is_ios || target_os == "freebsd") {
       sources += [
         "src/trap-handler/handler-inside-posix.cc",
         "src/trap-handler/handler-outside-posix.cc",
       ]
-      } else if (is_win) {
+    }
+    if (is_win) {
       sources += [
+        "src/diagnostics/unwinding-info-win64.cc",
         "src/trap-handler/handler-inside-win.cc",
         "src/trap-handler/handler-outside-win.cc",
       ]
     }
-    }
   } else if (v8_current_cpu == "arm") {
     sources += [  ### gcmole(arch:arm) ###
       "src/codegen/arm/assembler-arm.cc",
@@ -4258,7 +4250,7 @@ v8_source_set("v8_base_without_compiler") {
       "src/execution/arm64/simulator-logic-arm64.cc",
       "src/regexp/arm64/regexp-macro-assembler-arm64.cc",
     ]
-    if (v8_enable_webassembly && current_cpu == "arm64" && is_mac) {
+    if (current_cpu == "arm64" && is_mac) {
       sources += [
         "src/trap-handler/handler-inside-posix.cc",
         "src/trap-handler/handler-outside-posix.cc",

src/api/api.cc

@@ -109,11 +109,11 @@
 #include "src/strings/string-hasher.h"
 #include "src/strings/unicode-inl.h"
 #include "src/tracing/trace-event.h"
+#include "src/trap-handler/trap-handler.h"
 #include "src/utils/detachable-vector.h"
 #include "src/utils/version.h"
 
 #if V8_ENABLE_WEBASSEMBLY
-#include "src/trap-handler/trap-handler.h"
 #include "src/wasm/streaming-decoder.h"
 #include "src/wasm/value-type.h"
 #include "src/wasm/wasm-engine.h"
@@ -5854,9 +5854,8 @@ bool TryHandleWebAssemblyTrapPosix(int sig_code, siginfo_t* info,
   // code rather than the wasm code, so the trap handler cannot find the landing
   // pad and lets the process crash. Therefore, only enable trap handlers if
   // the host and target arch are the same.
-#if V8_ENABLE_WEBASSEMBLY &&                   \
-    ((V8_TARGET_ARCH_X64 && !V8_OS_ANDROID) || \
-     (V8_HOST_ARCH_ARM64 && V8_TARGET_ARCH_ARM64 && V8_OS_MACOSX))
+#if (V8_TARGET_ARCH_X64 && !V8_OS_ANDROID) || \
+    (V8_HOST_ARCH_ARM64 && V8_TARGET_ARCH_ARM64 && V8_OS_MACOSX)
   return i::trap_handler::TryHandleSignal(sig_code, info, context);
 #else
   return false;
@@ -5871,20 +5870,15 @@ bool V8::TryHandleSignal(int signum, void* info, void* context) {
 
 #if V8_OS_WIN
 bool TryHandleWebAssemblyTrapWindows(EXCEPTION_POINTERS* exception) {
-#if V8_ENABLE_WEBASSEMBLY && V8_TARGET_ARCH_X64
+#if V8_TARGET_ARCH_X64
   return i::trap_handler::TryHandleWasmTrap(exception);
-#else
-  return false;
 #endif
+  return false;
 }
 #endif
 
 bool V8::EnableWebAssemblyTrapHandler(bool use_v8_signal_handler) {
-#if V8_ENABLE_WEBASSEMBLY && V8_TARGET_ARCH_X64
   return v8::internal::trap_handler::EnableTrapHandler(use_v8_signal_handler);
-#else
-  return false;
-#endif
 }
 
 #if defined(V8_OS_WIN)

src/execution/isolate.cc

@@ -92,6 +92,7 @@
 #include "src/strings/string-stream.h"
 #include "src/tasks/cancelable-task.h"
 #include "src/tracing/tracing-category-observer.h"
+#include "src/trap-handler/trap-handler.h"
 #include "src/utils/address-map.h"
 #include "src/utils/ostreams.h"
 #include "src/utils/version.h"
@@ -102,7 +103,6 @@
 #endif  // V8_INTL_SUPPORT
 
 #if V8_ENABLE_WEBASSEMBLY
-#include "src/trap-handler/trap-handler.h"
 #include "src/wasm/wasm-code-manager.h"
 #include "src/wasm/wasm-engine.h"
 #include "src/wasm/wasm-module.h"
@@ -1582,7 +1582,7 @@ Handle<JSMessageObject> Isolate::CreateMessageOrAbort(
 
 Object Isolate::ThrowInternal(Object raw_exception, MessageLocation* location) {
   DCHECK(!has_pending_exception());
-  IF_WASM(DCHECK_IMPLIES, trap_handler::IsTrapHandlerEnabled(),
+  DCHECK_IMPLIES(trap_handler::IsTrapHandlerEnabled(),
                  !trap_handler::IsThreadInWasm());
 
   HandleScope scope(this);
@@ -1678,7 +1678,6 @@ Object Isolate::ReThrow(Object exception) {
 }
 
 namespace {
-#if V8_ENABLE_WEBASSEMBLY
 // This scope will set the thread-in-wasm flag after the execution of all
 // destructors. The thread-in-wasm flag is only set when the scope gets enabled.
 class SetThreadInWasmFlagScope {
@@ -1697,11 +1696,9 @@ class SetThreadInWasmFlagScope {
  private:
   bool enabled_ = false;
 };
-#endif  // V8_ENABLE_WEBASSEMBLY
 }  // namespace
 
 Object Isolate::UnwindAndFindHandler() {
-#if V8_ENABLE_WEBASSEMBLY
   // Create the {SetThreadInWasmFlagScope} first in this function so that its
   // destructor gets called after all the other destructors. It is important
   // that the destructor sets the thread-in-wasm flag after all other
@@ -1709,7 +1706,6 @@ Object Isolate::UnwindAndFindHandler() {
   // Windows, which would invalidate the thread-in-wasm flag when the wasm trap
   // handler handles such non-wasm exceptions.
   SetThreadInWasmFlagScope set_thread_in_wasm_flag_scope;
-#endif  // V8_ENABLE_WEBASSEMBLY
   Object exception = pending_exception();
 
   auto FoundHandler = [&](Context context, Address instruction_start,

src/execution/thread-local-top.cc

@@ -42,10 +42,8 @@ void ThreadLocalTop::Initialize(Isolate* isolate) {
   Clear();
   isolate_ = isolate;
   thread_id_ = ThreadId::Current();
-#if V8_ENABLE_WEBASSEMBLY
   thread_in_wasm_flag_address_ = reinterpret_cast<Address>(
       trap_handler::GetThreadInWasmThreadLocalAddress());
-#endif  // V8_ENABLE_WEBASSEMBLY
 #ifdef USE_SIMULATOR
   simulator_ = Simulator::current(isolate);
 #endif

src/objects/backing-store.cc

@@ -10,9 +10,9 @@
 #include "src/execution/isolate.h"
 #include "src/handles/global-handles.h"
 #include "src/logging/counters.h"
+#include "src/trap-handler/trap-handler.h"
 
 #if V8_ENABLE_WEBASSEMBLY
-#include "src/trap-handler/trap-handler.h"
 #include "src/wasm/wasm-constants.h"
 #include "src/wasm/wasm-engine.h"
 #include "src/wasm/wasm-limits.h"
@@ -349,12 +349,7 @@ std::unique_ptr<BackingStore> BackingStore::TryAllocateAndPartiallyCommitMemory(
 
   TRACE_BS("BSw:try   %zu pages, %zu max\n", initial_pages, maximum_pages);
 
-#if V8_ENABLE_WEBASSEMBLY
   bool guards = is_wasm_memory && trap_handler::IsTrapHandlerEnabled();
-#else
-  CHECK(!is_wasm_memory);
-  bool guards = false;
-#endif  // V8_ENABLE_WEBASSEMBLY
 
   // For accounting purposes, whether a GC was necessary.
   bool did_retry = false;