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Unified Diff: src/ia32/macro-assembler-ia32.cc

Issue 8538011: Reapply "Add a level of indirection to exception handler addresses." (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Created 9 years, 1 month ago
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Index: src/ia32/macro-assembler-ia32.cc
diff --git a/src/ia32/macro-assembler-ia32.cc b/src/ia32/macro-assembler-ia32.cc
index bb4f71b3893eafdd23b9ba9d43f5886379781b65..2d4f4cdb2f551966f55b646299f27c3c014400c9 100644
--- a/src/ia32/macro-assembler-ia32.cc
+++ b/src/ia32/macro-assembler-ia32.cc
@@ -725,84 +725,105 @@ void MacroAssembler::LeaveApiExitFrame() {
void MacroAssembler::PushTryHandler(CodeLocation try_location,
- HandlerType type) {
+ HandlerType type,
+ int handler_index) {
// Adjust this code if not the case.
STATIC_ASSERT(StackHandlerConstants::kSize == 5 * kPointerSize);
STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
- STATIC_ASSERT(StackHandlerConstants::kContextOffset == 1 * kPointerSize);
- STATIC_ASSERT(StackHandlerConstants::kFPOffset == 2 * kPointerSize);
- STATIC_ASSERT(StackHandlerConstants::kStateOffset == 3 * kPointerSize);
- STATIC_ASSERT(StackHandlerConstants::kPCOffset == 4 * kPointerSize);
- // The pc (return address) is already on TOS.
+ STATIC_ASSERT(StackHandlerConstants::kCodeOffset == 1 * kPointerSize);
+ STATIC_ASSERT(StackHandlerConstants::kStateOffset == 2 * kPointerSize);
+ STATIC_ASSERT(StackHandlerConstants::kContextOffset == 3 * kPointerSize);
+ STATIC_ASSERT(StackHandlerConstants::kFPOffset == 4 * kPointerSize);
+
+ // We will build up the handler from the bottom by pushing on the stack.
+ // First compute the state and push the frame pointer and context.
+ unsigned state = StackHandler::OffsetField::encode(handler_index);
if (try_location == IN_JAVASCRIPT) {
- if (type == TRY_CATCH_HANDLER) {
- push(Immediate(StackHandler::TRY_CATCH));
- } else {
- push(Immediate(StackHandler::TRY_FINALLY));
- }
push(ebp);
push(esi);
+ state |= (type == TRY_CATCH_HANDLER)
+ ? StackHandler::KindField::encode(StackHandler::TRY_CATCH)
+ : StackHandler::KindField::encode(StackHandler::TRY_FINALLY);
} else {
ASSERT(try_location == IN_JS_ENTRY);
- // The frame pointer does not point to a JS frame so we save NULL
- // for ebp. We expect the code throwing an exception to check ebp
- // before dereferencing it to restore the context.
- push(Immediate(StackHandler::ENTRY));
+ // The frame pointer does not point to a JS frame so we save NULL for
+ // ebp. We expect the code throwing an exception to check ebp before
+ // dereferencing it to restore the context.
push(Immediate(0)); // NULL frame pointer.
push(Immediate(Smi::FromInt(0))); // No context.
+ state |= StackHandler::KindField::encode(StackHandler::ENTRY);
}
- // Save the current handler as the next handler.
- push(Operand::StaticVariable(ExternalReference(Isolate::kHandlerAddress,
- isolate())));
- // Link this handler as the new current one.
- mov(Operand::StaticVariable(ExternalReference(Isolate::kHandlerAddress,
- isolate())),
- esp);
+
+ // Push the state and the code object.
+ push(Immediate(state));
+ push(CodeObject());
+
+ // Link the current handler as the next handler.
+ ExternalReference handler_address(Isolate::kHandlerAddress, isolate());
+ push(Operand::StaticVariable(handler_address));
+ // Set this new handler as the current one.
+ mov(Operand::StaticVariable(handler_address), esp);
}
void MacroAssembler::PopTryHandler() {
STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
- pop(Operand::StaticVariable(ExternalReference(Isolate::kHandlerAddress,
- isolate())));
+ ExternalReference handler_address(Isolate::kHandlerAddress, isolate());
+ pop(Operand::StaticVariable(handler_address));
add(esp, Immediate(StackHandlerConstants::kSize - kPointerSize));
}
+void MacroAssembler::JumpToHandlerEntry() {
+ // Compute the handler entry address and jump to it. The handler table is
+ // a fixed array of (smi-tagged) code offsets.
+ // eax = exception, edi = code object, edx = state.
+ mov(ebx, FieldOperand(edi, Code::kHandlerTableOffset));
+ shr(edx, StackHandler::kKindWidth);
+ mov(edx, FieldOperand(ebx, edx, times_4, FixedArray::kHeaderSize));
+ SmiUntag(edx);
+ lea(edi, FieldOperand(edi, edx, times_1, Code::kHeaderSize));
+ jmp(edi);
+}
+
+
void MacroAssembler::Throw(Register value) {
// Adjust this code if not the case.
STATIC_ASSERT(StackHandlerConstants::kSize == 5 * kPointerSize);
STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
- STATIC_ASSERT(StackHandlerConstants::kContextOffset == 1 * kPointerSize);
- STATIC_ASSERT(StackHandlerConstants::kFPOffset == 2 * kPointerSize);
- STATIC_ASSERT(StackHandlerConstants::kStateOffset == 3 * kPointerSize);
- STATIC_ASSERT(StackHandlerConstants::kPCOffset == 4 * kPointerSize);
- // eax must hold the exception.
+ STATIC_ASSERT(StackHandlerConstants::kCodeOffset == 1 * kPointerSize);
+ STATIC_ASSERT(StackHandlerConstants::kStateOffset == 2 * kPointerSize);
+ STATIC_ASSERT(StackHandlerConstants::kContextOffset == 3 * kPointerSize);
+ STATIC_ASSERT(StackHandlerConstants::kFPOffset == 4 * kPointerSize);
+
+ // The exception is expected in eax.
if (!value.is(eax)) {
mov(eax, value);
}
-
- // Drop the sp to the top of the handler.
- ExternalReference handler_address(Isolate::kHandlerAddress,
- isolate());
+ // Drop the stack pointer to the top of the top handler.
+ ExternalReference handler_address(Isolate::kHandlerAddress, isolate());
mov(esp, Operand::StaticVariable(handler_address));
-
- // Restore next handler, context, and frame pointer; discard handler state.
+ // Restore the next handler.
pop(Operand::StaticVariable(handler_address));
+
+ // Remove the code object and state, compute the handler address in edi.
+ pop(edi); // Code object.
+ pop(edx); // Index and state.
+
+ // Restore the context and frame pointer.
pop(esi); // Context.
pop(ebp); // Frame pointer.
- pop(edx); // State.
// If the handler is a JS frame, restore the context to the frame.
- // (edx == ENTRY) == (ebp == 0) == (esi == 0), so we could test any
- // of them.
+ // (kind == ENTRY) == (ebp == 0) == (esi == 0), so we could test either
+ // ebp or esi.
Label skip;
- cmp(edx, Immediate(StackHandler::ENTRY));
- j(equal, &skip, Label::kNear);
+ test(esi, esi);
+ j(zero, &skip, Label::kNear);
mov(Operand(ebp, StandardFrameConstants::kContextOffset), esi);
bind(&skip);
- ret(0);
+ JumpToHandlerEntry();
}
@@ -811,10 +832,10 @@ void MacroAssembler::ThrowUncatchable(UncatchableExceptionType type,
// Adjust this code if not the case.
STATIC_ASSERT(StackHandlerConstants::kSize == 5 * kPointerSize);
STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
- STATIC_ASSERT(StackHandlerConstants::kContextOffset == 1 * kPointerSize);
- STATIC_ASSERT(StackHandlerConstants::kFPOffset == 2 * kPointerSize);
- STATIC_ASSERT(StackHandlerConstants::kStateOffset == 3 * kPointerSize);
- STATIC_ASSERT(StackHandlerConstants::kPCOffset == 4 * kPointerSize);
+ STATIC_ASSERT(StackHandlerConstants::kCodeOffset == 1 * kPointerSize);
+ STATIC_ASSERT(StackHandlerConstants::kStateOffset == 2 * kPointerSize);
+ STATIC_ASSERT(StackHandlerConstants::kContextOffset == 3 * kPointerSize);
+ STATIC_ASSERT(StackHandlerConstants::kFPOffset == 4 * kPointerSize);
// The exception is expected in eax.
if (type == OUT_OF_MEMORY) {
@@ -843,20 +864,23 @@ void MacroAssembler::ThrowUncatchable(UncatchableExceptionType type,
mov(esp, Operand(esp, StackHandlerConstants::kNextOffset));
bind(&check_kind);
- cmp(Operand(esp, StackHandlerConstants::kStateOffset),
- Immediate(StackHandler::ENTRY));
- j(not_equal, &fetch_next);
+ STATIC_ASSERT(StackHandler::ENTRY == 0);
+ test(Operand(esp, StackHandlerConstants::kStateOffset),
+ Immediate(StackHandler::KindField::kMask));
+ j(not_zero, &fetch_next);
// Set the top handler address to next handler past the top ENTRY handler.
pop(Operand::StaticVariable(handler_address));
- // Clear the context and frame pointer (0 was saved in the handler), and
- // discard the state.
+ // Remove the code object and state, compute the handler address in edi.
+ pop(edi); // Code object.
+ pop(edx); // Index and state.
+
+ // Clear the context pointer and frame pointer (0 was saved in the handler).
pop(esi);
pop(ebp);
- pop(edx); // State.
- ret(0);
+ JumpToHandlerEntry();
}
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