From 03620298befb7083b80eeda7a8172ecc204fc758 Mon Sep 17 00:00:00 2001 From: "balazs.kilvady" Date: Wed, 25 Mar 2015 07:41:23 -0700 Subject: [PATCH] MIPS: Switch full-codegen from StackHandlers to handler table. Port 38a719f965d0a83ddac04392d5b9c5abe214281c Original commit message: This switches full-codegen to no longer push and pop StackHandler markers onto the operand stack, but relies on a range-based handler table instead. We only use StackHandlers in JSEntryStubs to mark the transition from C to JS code. Note that this makes deoptimization and OSR from within any try-block work out of the box, makes the non-exception paths faster and should overall be neutral on the memory footprint (pros). On the other hand it makes the exception paths slower and actually throwing and exception more expensive (cons). TEST=cctest/test-run-jsexceptions/DeoptTry BUG= Review URL: https://codereview.chromium.org/1037743002 Cr-Commit-Position: refs/heads/master@{#27443} --- src/mips/code-stubs-mips.cc | 14 ++++----- src/mips/full-codegen-mips.cc | 43 ++++++---------------------- src/mips/macro-assembler-mips.cc | 26 +++-------------- src/mips/macro-assembler-mips.h | 8 +++--- src/mips64/code-stubs-mips64.cc | 14 ++++----- src/mips64/full-codegen-mips64.cc | 43 ++++++---------------------- src/mips64/macro-assembler-mips64.cc | 26 +++-------------- src/mips64/macro-assembler-mips64.h | 8 +++--- 8 files changed, 44 insertions(+), 138 deletions(-) diff --git a/src/mips/code-stubs-mips.cc b/src/mips/code-stubs-mips.cc index dca8c9d69a..5191e36596 100644 --- a/src/mips/code-stubs-mips.cc +++ b/src/mips/code-stubs-mips.cc @@ -1178,9 +1178,8 @@ void CEntryStub::Generate(MacroAssembler* masm) { __ li(fp, Operand(pending_handler_fp_address)); __ lw(fp, MemOperand(fp)); - // If the handler is a JS frame, restore the context to the frame. - // (kind == ENTRY) == (fp == 0) == (cp == 0), so we could test either fp - // or cp. + // If the handler is a JS frame, restore the context to the frame. Note that + // the context will be set to (cp == 0) for non-JS frames. Label zero; __ Branch(&zero, eq, cp, Operand(zero_reg)); __ sw(cp, MemOperand(fp, StandardFrameConstants::kContextOffset)); @@ -1280,7 +1279,7 @@ void JSEntryStub::Generate(MacroAssembler* masm) { handler_offset_ = handler_entry.pos(); // Caught exception: Store result (exception) in the pending exception // field in the JSEnv and return a failure sentinel. Coming in here the - // fp will be invalid because the PushTryHandler below sets it to 0 to + // fp will be invalid because the PushStackHandler below sets it to 0 to // signal the existence of the JSEntry frame. __ li(t0, Operand(ExternalReference(Isolate::kPendingExceptionAddress, isolate))); @@ -1289,10 +1288,9 @@ void JSEntryStub::Generate(MacroAssembler* masm) { __ b(&exit); // b exposes branch delay slot. __ nop(); // Branch delay slot nop. - // Invoke: Link this frame into the handler chain. There's only one - // handler block in this code object, so its index is 0. + // Invoke: Link this frame into the handler chain. __ bind(&invoke); - __ PushTryHandler(StackHandler::JS_ENTRY, 0); + __ PushStackHandler(); // If an exception not caught by another handler occurs, this handler // returns control to the code after the bal(&invoke) above, which // restores all kCalleeSaved registers (including cp and fp) to their @@ -1337,7 +1335,7 @@ void JSEntryStub::Generate(MacroAssembler* masm) { __ Call(t9); // Unlink this frame from the handler chain. - __ PopTryHandler(); + __ PopStackHandler(); __ bind(&exit); // v0 holds result // Check if the current stack frame is marked as the outermost JS frame. diff --git a/src/mips/full-codegen-mips.cc b/src/mips/full-codegen-mips.cc index c47ebde502..9a7de136ef 100644 --- a/src/mips/full-codegen-mips.cc +++ b/src/mips/full-codegen-mips.cc @@ -115,7 +115,8 @@ class JumpPatchSite BASE_EMBEDDED { void FullCodeGenerator::Generate() { CompilationInfo* info = info_; handler_table_ = - isolate()->factory()->NewFixedArray(function()->handler_count(), TENURED); + Handle::cast(isolate()->factory()->NewFixedArray( + HandlerTable::LengthForRange(function()->handler_count()), TENURED)); profiling_counter_ = isolate()->factory()->NewCell( Handle(Smi::FromInt(FLAG_interrupt_budget), isolate())); @@ -2185,7 +2186,6 @@ void FullCodeGenerator::VisitYield(Yield* expr) { // catch (e) { receiver = iter; f = 'throw'; arg = e; goto l_call; } __ bind(&l_catch); __ mov(a0, v0); - handler_table()->set(expr->index(), Smi::FromInt(l_catch.pos())); __ LoadRoot(load_name, Heap::kthrow_stringRootIndex); // "throw" __ lw(a3, MemOperand(sp, 1 * kPointerSize)); // iter __ Push(load_name, a3, a0); // "throw", iter, except @@ -2196,17 +2196,18 @@ void FullCodeGenerator::VisitYield(Yield* expr) { // re-boxing. __ bind(&l_try); __ pop(a0); // result - __ PushTryHandler(StackHandler::CATCH, expr->index()); - const int handler_size = StackHandlerConstants::kSize; + EnterTryBlock(expr->index(), &l_catch); + const int try_block_size = TryCatch::kElementCount * kPointerSize; __ push(a0); // result __ jmp(&l_suspend); __ bind(&l_continuation); __ mov(a0, v0); __ jmp(&l_resume); __ bind(&l_suspend); - const int generator_object_depth = kPointerSize + handler_size; + const int generator_object_depth = kPointerSize + try_block_size; __ lw(a0, MemOperand(sp, generator_object_depth)); __ push(a0); // g + __ Push(Smi::FromInt(expr->index())); // handler-index DCHECK(l_continuation.pos() > 0 && Smi::IsValid(l_continuation.pos())); __ li(a1, Operand(Smi::FromInt(l_continuation.pos()))); __ sw(a1, FieldMemOperand(a0, JSGeneratorObject::kContinuationOffset)); @@ -2214,13 +2215,13 @@ void FullCodeGenerator::VisitYield(Yield* expr) { __ mov(a1, cp); __ RecordWriteField(a0, JSGeneratorObject::kContextOffset, a1, a2, kRAHasBeenSaved, kDontSaveFPRegs); - __ CallRuntime(Runtime::kSuspendJSGeneratorObject, 1); + __ CallRuntime(Runtime::kSuspendJSGeneratorObject, 2); __ lw(cp, MemOperand(fp, StandardFrameConstants::kContextOffset)); __ pop(v0); // result EmitReturnSequence(); __ mov(a0, v0); __ bind(&l_resume); // received in a0 - __ PopTryHandler(); + ExitTryBlock(expr->index()); // receiver = iter; f = 'next'; arg = received; __ bind(&l_next); @@ -5359,34 +5360,6 @@ void FullCodeGenerator::ExitFinallyBlock() { } -#undef __ - -#define __ ACCESS_MASM(masm()) - -FullCodeGenerator::NestedStatement* FullCodeGenerator::TryFinally::Exit( - int* stack_depth, - int* context_length) { - // The macros used here must preserve the result register. - - // Because the handler block contains the context of the finally - // code, we can restore it directly from there for the finally code - // rather than iteratively unwinding contexts via their previous - // links. - __ Drop(*stack_depth); // Down to the handler block. - if (*context_length > 0) { - // Restore the context to its dedicated register and the stack. - __ lw(cp, MemOperand(sp, StackHandlerConstants::kContextOffset)); - __ sw(cp, MemOperand(fp, StandardFrameConstants::kContextOffset)); - } - __ PopTryHandler(); - __ Call(finally_entry_); - - *stack_depth = 0; - *context_length = 0; - return previous_; -} - - #undef __ diff --git a/src/mips/macro-assembler-mips.cc b/src/mips/macro-assembler-mips.cc index a6e394ca0e..406348f2f5 100644 --- a/src/mips/macro-assembler-mips.cc +++ b/src/mips/macro-assembler-mips.cc @@ -3235,40 +3235,22 @@ void MacroAssembler::DebugBreak() { // --------------------------------------------------------------------------- // Exception handling. -void MacroAssembler::PushTryHandler(StackHandler::Kind kind, - int handler_index) { +void MacroAssembler::PushStackHandler() { // Adjust this code if not the case. - STATIC_ASSERT(StackHandlerConstants::kSize == 3 * kPointerSize); + STATIC_ASSERT(StackHandlerConstants::kSize == 1 * kPointerSize); STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0 * kPointerSize); - STATIC_ASSERT(StackHandlerConstants::kStateOffset == 1 * kPointerSize); - STATIC_ASSERT(StackHandlerConstants::kContextOffset == 2 * kPointerSize); - - // For the JSEntry handler, we must preserve a0-a3 and s0. - // t1-t3 are available. We will build up the handler from the bottom by - // pushing on the stack. - // Set up the the index (t2) for pushing. - li(t2, Operand(handler_index)); - - // Push the context and index. - if (kind == StackHandler::JS_ENTRY) { - DCHECK(Smi::FromInt(0) == 0); - // The zero_reg indicates no context. - // The operands are reversed to match the order of MultiPush/Pop. - Push(zero_reg, t2); - } else { - MultiPush(t2.bit() | cp.bit()); - } // Link the current handler as the next handler. li(t2, Operand(ExternalReference(Isolate::kHandlerAddress, isolate()))); lw(t1, MemOperand(t2)); push(t1); + // Set this new handler as the current one. sw(sp, MemOperand(t2)); } -void MacroAssembler::PopTryHandler() { +void MacroAssembler::PopStackHandler() { STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0); pop(a1); Addu(sp, sp, Operand(StackHandlerConstants::kSize - kPointerSize)); diff --git a/src/mips/macro-assembler-mips.h b/src/mips/macro-assembler-mips.h index 44f6c4b58a..481c7d4a52 100644 --- a/src/mips/macro-assembler-mips.h +++ b/src/mips/macro-assembler-mips.h @@ -969,12 +969,12 @@ class MacroAssembler: public Assembler { // ------------------------------------------------------------------------- // Exception handling. - // Push a new try handler and link into try handler chain. - void PushTryHandler(StackHandler::Kind kind, int handler_index); + // Push a new stack handler and link into stack handler chain. + void PushStackHandler(); - // Unlink the stack handler on top of the stack from the try handler chain. + // Unlink the stack handler on top of the stack from the stack handler chain. // Must preserve the result register. - void PopTryHandler(); + void PopStackHandler(); // Copies a fixed number of fields of heap objects from src to dst. void CopyFields(Register dst, Register src, RegList temps, int field_count); diff --git a/src/mips64/code-stubs-mips64.cc b/src/mips64/code-stubs-mips64.cc index 74477b557b..0f83a613c1 100644 --- a/src/mips64/code-stubs-mips64.cc +++ b/src/mips64/code-stubs-mips64.cc @@ -1173,9 +1173,8 @@ void CEntryStub::Generate(MacroAssembler* masm) { __ li(fp, Operand(pending_handler_fp_address)); __ ld(fp, MemOperand(fp)); - // If the handler is a JS frame, restore the context to the frame. - // (kind == ENTRY) == (fp == 0) == (cp == 0), so we could test either fp - // or cp. + // If the handler is a JS frame, restore the context to the frame. Note that + // the context will be set to (cp == 0) for non-JS frames. Label zero; __ Branch(&zero, eq, cp, Operand(zero_reg)); __ sd(cp, MemOperand(fp, StandardFrameConstants::kContextOffset)); @@ -1281,7 +1280,7 @@ void JSEntryStub::Generate(MacroAssembler* masm) { handler_offset_ = handler_entry.pos(); // Caught exception: Store result (exception) in the pending exception // field in the JSEnv and return a failure sentinel. Coming in here the - // fp will be invalid because the PushTryHandler below sets it to 0 to + // fp will be invalid because the PushStackHandler below sets it to 0 to // signal the existence of the JSEntry frame. __ li(a4, Operand(ExternalReference(Isolate::kPendingExceptionAddress, isolate))); @@ -1290,10 +1289,9 @@ void JSEntryStub::Generate(MacroAssembler* masm) { __ b(&exit); // b exposes branch delay slot. __ nop(); // Branch delay slot nop. - // Invoke: Link this frame into the handler chain. There's only one - // handler block in this code object, so its index is 0. + // Invoke: Link this frame into the handler chain. __ bind(&invoke); - __ PushTryHandler(StackHandler::JS_ENTRY, 0); + __ PushStackHandler(); // If an exception not caught by another handler occurs, this handler // returns control to the code after the bal(&invoke) above, which // restores all kCalleeSaved registers (including cp and fp) to their @@ -1337,7 +1335,7 @@ void JSEntryStub::Generate(MacroAssembler* masm) { __ Call(t9); // Unlink this frame from the handler chain. - __ PopTryHandler(); + __ PopStackHandler(); __ bind(&exit); // v0 holds result // Check if the current stack frame is marked as the outermost JS frame. diff --git a/src/mips64/full-codegen-mips64.cc b/src/mips64/full-codegen-mips64.cc index 0f157ec1a3..525b04a23e 100644 --- a/src/mips64/full-codegen-mips64.cc +++ b/src/mips64/full-codegen-mips64.cc @@ -115,7 +115,8 @@ class JumpPatchSite BASE_EMBEDDED { void FullCodeGenerator::Generate() { CompilationInfo* info = info_; handler_table_ = - isolate()->factory()->NewFixedArray(function()->handler_count(), TENURED); + Handle::cast(isolate()->factory()->NewFixedArray( + HandlerTable::LengthForRange(function()->handler_count()), TENURED)); profiling_counter_ = isolate()->factory()->NewCell( Handle(Smi::FromInt(FLAG_interrupt_budget), isolate())); @@ -2182,7 +2183,6 @@ void FullCodeGenerator::VisitYield(Yield* expr) { // catch (e) { receiver = iter; f = 'throw'; arg = e; goto l_call; } __ bind(&l_catch); __ mov(a0, v0); - handler_table()->set(expr->index(), Smi::FromInt(l_catch.pos())); __ LoadRoot(a2, Heap::kthrow_stringRootIndex); // "throw" __ ld(a3, MemOperand(sp, 1 * kPointerSize)); // iter __ Push(a2, a3, a0); // "throw", iter, except @@ -2193,17 +2193,18 @@ void FullCodeGenerator::VisitYield(Yield* expr) { // re-boxing. __ bind(&l_try); __ pop(a0); // result - __ PushTryHandler(StackHandler::CATCH, expr->index()); - const int handler_size = StackHandlerConstants::kSize; + EnterTryBlock(expr->index(), &l_catch); + const int try_block_size = TryCatch::kElementCount * kPointerSize; __ push(a0); // result __ jmp(&l_suspend); __ bind(&l_continuation); __ mov(a0, v0); __ jmp(&l_resume); __ bind(&l_suspend); - const int generator_object_depth = kPointerSize + handler_size; + const int generator_object_depth = kPointerSize + try_block_size; __ ld(a0, MemOperand(sp, generator_object_depth)); __ push(a0); // g + __ Push(Smi::FromInt(expr->index())); // handler-index DCHECK(l_continuation.pos() > 0 && Smi::IsValid(l_continuation.pos())); __ li(a1, Operand(Smi::FromInt(l_continuation.pos()))); __ sd(a1, FieldMemOperand(a0, JSGeneratorObject::kContinuationOffset)); @@ -2211,13 +2212,13 @@ void FullCodeGenerator::VisitYield(Yield* expr) { __ mov(a1, cp); __ RecordWriteField(a0, JSGeneratorObject::kContextOffset, a1, a2, kRAHasBeenSaved, kDontSaveFPRegs); - __ CallRuntime(Runtime::kSuspendJSGeneratorObject, 1); + __ CallRuntime(Runtime::kSuspendJSGeneratorObject, 2); __ ld(cp, MemOperand(fp, StandardFrameConstants::kContextOffset)); __ pop(v0); // result EmitReturnSequence(); __ mov(a0, v0); __ bind(&l_resume); // received in a0 - __ PopTryHandler(); + ExitTryBlock(expr->index()); // receiver = iter; f = 'next'; arg = received; __ bind(&l_next); @@ -5361,34 +5362,6 @@ void FullCodeGenerator::ExitFinallyBlock() { } -#undef __ - -#define __ ACCESS_MASM(masm()) - -FullCodeGenerator::NestedStatement* FullCodeGenerator::TryFinally::Exit( - int* stack_depth, - int* context_length) { - // The macros used here must preserve the result register. - - // Because the handler block contains the context of the finally - // code, we can restore it directly from there for the finally code - // rather than iteratively unwinding contexts via their previous - // links. - __ Drop(*stack_depth); // Down to the handler block. - if (*context_length > 0) { - // Restore the context to its dedicated register and the stack. - __ ld(cp, MemOperand(sp, StackHandlerConstants::kContextOffset)); - __ sd(cp, MemOperand(fp, StandardFrameConstants::kContextOffset)); - } - __ PopTryHandler(); - __ Call(finally_entry_); - - *stack_depth = 0; - *context_length = 0; - return previous_; -} - - #undef __ diff --git a/src/mips64/macro-assembler-mips64.cc b/src/mips64/macro-assembler-mips64.cc index bf008e084b..181c5451db 100644 --- a/src/mips64/macro-assembler-mips64.cc +++ b/src/mips64/macro-assembler-mips64.cc @@ -3222,40 +3222,22 @@ void MacroAssembler::DebugBreak() { // --------------------------------------------------------------------------- // Exception handling. -void MacroAssembler::PushTryHandler(StackHandler::Kind kind, - int handler_index) { +void MacroAssembler::PushStackHandler() { // Adjust this code if not the case. - STATIC_ASSERT(StackHandlerConstants::kSize == 3 * kPointerSize); + STATIC_ASSERT(StackHandlerConstants::kSize == 1 * kPointerSize); STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0 * kPointerSize); - STATIC_ASSERT(StackHandlerConstants::kStateOffset == 1 * kPointerSize); - STATIC_ASSERT(StackHandlerConstants::kContextOffset == 2 * kPointerSize); - - // For the JSEntry handler, we must preserve a0-a3 and s0. - // a5-a7 are available. We will build up the handler from the bottom by - // pushing on the stack. - // Set up the the index (a6) for pushing. - li(a6, Operand(handler_index)); - - // Push the context and index. - if (kind == StackHandler::JS_ENTRY) { - DCHECK(Smi::FromInt(0) == 0); - // The zero_reg indicates no context. - // The operands are reversed to match the order of MultiPush/Pop. - Push(zero_reg, a6); - } else { - MultiPush(a6.bit() | cp.bit()); - } // Link the current handler as the next handler. li(a6, Operand(ExternalReference(Isolate::kHandlerAddress, isolate()))); ld(a5, MemOperand(a6)); push(a5); + // Set this new handler as the current one. sd(sp, MemOperand(a6)); } -void MacroAssembler::PopTryHandler() { +void MacroAssembler::PopStackHandler() { STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0); pop(a1); Daddu(sp, sp, Operand(StackHandlerConstants::kSize - kPointerSize)); diff --git a/src/mips64/macro-assembler-mips64.h b/src/mips64/macro-assembler-mips64.h index 3c1c2b0a50..6088b6164e 100644 --- a/src/mips64/macro-assembler-mips64.h +++ b/src/mips64/macro-assembler-mips64.h @@ -999,12 +999,12 @@ class MacroAssembler: public Assembler { // ------------------------------------------------------------------------- // Exception handling. - // Push a new try handler and link into try handler chain. - void PushTryHandler(StackHandler::Kind kind, int handler_index); + // Push a new stack handler and link into stack handler chain. + void PushStackHandler(); - // Unlink the stack handler on top of the stack from the try handler chain. + // Unlink the stack handler on top of the stack from the stack handler chain. // Must preserve the result register. - void PopTryHandler(); + void PopStackHandler(); // Copies a fixed number of fields of heap objects from src to dst. void CopyFields(Register dst, Register src, RegList temps, int field_count);