tor-browser

The Tor Browser
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SharedICHelpers-riscv64-inl.h (2649B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
      2 * vim: set ts=8 sts=2 et sw=2 tw=80:
      3 * This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 #ifndef jit_riscv64_SharedICHelpers_riscv64_inl_h
      8 #define jit_riscv64_SharedICHelpers_riscv64_inl_h
      9 
     10 #include "jit/BaselineFrame.h"
     11 #include "jit/SharedICHelpers.h"
     12 
     13 namespace js {
     14 namespace jit {
     15 
     16 inline void EmitBaselineTailCallVM(TrampolinePtr target, MacroAssembler& masm,
     17                                   uint32_t argSize) {
     18 #ifdef DEBUG
     19  Register scratch = R2.scratchReg();
     20 
     21  // Compute frame size.
     22  masm.movePtr(FramePointer, scratch);
     23  masm.subPtr(StackPointer, scratch);
     24 
     25  // Store frame size without VMFunction arguments for debug assertions.
     26  masm.subPtr(Imm32(argSize), scratch);
     27  Address frameSizeAddr(FramePointer,
     28                        BaselineFrame::reverseOffsetOfDebugFrameSize());
     29  masm.store32(scratch, frameSizeAddr);
     30  masm.addPtr(Imm32(argSize), scratch);
     31 #endif
     32 
     33  // Push frame descriptor and perform the tail call.
     34  masm.push(FrameDescriptor(FrameType::BaselineJS));
     35 
     36  MOZ_ASSERT(ICTailCallReg == ra);
     37  // The return address will be pushed by the VM wrapper, for compatibility
     38  // with direct calls. Refer to the top of generateVMWrapper().
     39  // ICTailCallReg (ra) already contains the return address (as we keep
     40  // it there through the stub calls).
     41 
     42  masm.jump(target);
     43 }
     44 
     45 inline void EmitBaselineCallVM(TrampolinePtr target, MacroAssembler& masm) {
     46  masm.push(FrameDescriptor(FrameType::BaselineStub));
     47  masm.call(target);
     48 }
     49 
     50 inline void EmitBaselineEnterStubFrame(MacroAssembler& masm, Register scratch) {
     51  MOZ_ASSERT(scratch != ICTailCallReg);
     52 
     53 #ifdef DEBUG
     54  // Compute frame size.
     55  masm.movePtr(FramePointer, scratch);
     56  masm.subPtr(StackPointer, scratch);
     57 
     58  Address frameSizeAddr(FramePointer,
     59                        BaselineFrame::reverseOffsetOfDebugFrameSize());
     60  masm.store32(scratch, frameSizeAddr);
     61 #endif
     62 
     63  // Note: when making changes here, don't forget to update
     64  // BaselineStubFrame if needed.
     65 
     66  // Push frame descriptor and return address.
     67  masm.Push(FrameDescriptor(FrameType::BaselineJS));
     68  masm.Push(ICTailCallReg);
     69 
     70  // Save old frame pointer, stack pointer and stub reg.
     71  masm.Push(FramePointer);
     72  masm.movePtr(StackPointer, FramePointer);
     73  masm.Push(ICStubReg);
     74 
     75  // Stack should remain aligned.
     76  masm.assertStackAlignment(sizeof(Value), 0);
     77 }
     78 
     79 }  // namespace jit
     80 }  // namespace js
     81 
     82 #endif /* jit_riscv64_SharedICHelpers_riscv64_inl_h */