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Diffstat (limited to 'deps/v8/src/jump-target-light.h')
| -rw-r--r-- | deps/v8/src/jump-target-light.h | 193 |
1 files changed, 0 insertions, 193 deletions
diff --git a/deps/v8/src/jump-target-light.h b/deps/v8/src/jump-target-light.h deleted file mode 100644 index 0d653063bd..0000000000 --- a/deps/v8/src/jump-target-light.h +++ /dev/null @@ -1,193 +0,0 @@ -// Copyright 2008 the V8 project authors. All rights reserved. -// Redistribution and use in source and binary forms, with or without -// modification, are permitted provided that the following conditions are -// met: -// -// * Redistributions of source code must retain the above copyright -// notice, this list of conditions and the following disclaimer. -// * Redistributions in binary form must reproduce the above -// copyright notice, this list of conditions and the following -// disclaimer in the documentation and/or other materials provided -// with the distribution. -// * Neither the name of Google Inc. nor the names of its -// contributors may be used to endorse or promote products derived -// from this software without specific prior written permission. -// -// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT -// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR -// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT -// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, -// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT -// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, -// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY -// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE -// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - -#ifndef V8_JUMP_TARGET_LIGHT_H_ -#define V8_JUMP_TARGET_LIGHT_H_ - -#include "macro-assembler.h" -#include "zone-inl.h" -#include "virtual-frame.h" - -namespace v8 { -namespace internal { - -// Forward declarations. -class FrameElement; -class Result; - -// ------------------------------------------------------------------------- -// Jump targets -// -// A jump target is an abstraction of a basic-block entry in generated -// code. It collects all the virtual frames reaching the block by -// forward jumps and pairs them with labels for the merge code along -// all forward-reaching paths. When bound, an expected frame for the -// block is determined and code is generated to merge to the expected -// frame. For backward jumps, the merge code is generated at the edge -// leaving the predecessor block. -// -// A jump target must have been reached via control flow (either by -// jumping, branching, or falling through) at the time it is bound. -// In particular, this means that at least one of the control-flow -// graph edges reaching the target must be a forward edge. - -class JumpTarget : public ZoneObject { // Shadows are dynamically allocated. - public: - // Forward-only jump targets can only be reached by forward CFG edges. - enum Directionality { FORWARD_ONLY, BIDIRECTIONAL }; - - // Construct a jump target. - explicit inline JumpTarget(Directionality direction); - - inline JumpTarget(); - - virtual ~JumpTarget() {} - - void Unuse() { - entry_frame_set_ = false; - entry_label_.Unuse(); - } - - inline CodeGenerator* cgen(); - - Label* entry_label() { return &entry_label_; } - - const VirtualFrame* entry_frame() const { - return entry_frame_set_ ? &entry_frame_ : NULL; - } - - void set_entry_frame(VirtualFrame* frame) { - entry_frame_ = *frame; - entry_frame_set_ = true; - } - - // Predicates testing the state of the encapsulated label. - bool is_bound() const { return entry_label_.is_bound(); } - bool is_linked() const { return entry_label_.is_linked(); } - bool is_unused() const { return entry_label_.is_unused(); } - - // Copy the state of this jump target to the destination. - inline void CopyTo(JumpTarget* destination) { - *destination = *this; - } - - // Emit a jump to the target. There must be a current frame at the - // jump and there will be no current frame after the jump. - virtual void Jump(); - - // Emit a conditional branch to the target. There must be a current - // frame at the branch. The current frame will fall through to the - // code after the branch. - virtual void Branch(Condition cc, Hint hint = no_hint); - - // Bind a jump target. If there is no current frame at the binding - // site, there must be at least one frame reaching via a forward - // jump. - virtual void Bind(); - - // Emit a call to a jump target. There must be a current frame at - // the call. The frame at the target is the same as the current - // frame except for an extra return address on top of it. The frame - // after the call is the same as the frame before the call. - void Call(); - - protected: - // Has an entry frame been found? - bool entry_frame_set_; - - // Can we branch backwards to this label? - Directionality direction_; - - // The frame used on entry to the block and expected at backward - // jumps to the block. Set the first time something branches to this - // jump target. - VirtualFrame entry_frame_; - - // The actual entry label of the block. - Label entry_label_; - - // Implementations of Jump, Branch, and Bind with all arguments and - // return values using the virtual frame. - void DoJump(); - void DoBranch(Condition cc, Hint hint); - void DoBind(); -}; - - -// ------------------------------------------------------------------------- -// Break targets -// -// A break target is a jump target that can be used to break out of a -// statement that keeps extra state on the stack (eg, for/in or -// try/finally). They know the expected stack height at the target -// and will drop state from nested statements as part of merging. -// -// Break targets are used for return, break, and continue targets. - -class BreakTarget : public JumpTarget { - public: - // Construct a break target. - inline BreakTarget(); - - inline BreakTarget(JumpTarget::Directionality direction); - - virtual ~BreakTarget() {} - - // Copy the state of this jump target to the destination. - inline void CopyTo(BreakTarget* destination) { - *destination = *this; - } - - // Emit a jump to the target. There must be a current frame at the - // jump and there will be no current frame after the jump. - virtual void Jump(); - - // Emit a conditional branch to the target. There must be a current - // frame at the branch. The current frame will fall through to the - // code after the branch. - virtual void Branch(Condition cc, Hint hint = no_hint); - - // Bind a break target. If there is no current frame at the binding - // site, there must be at least one frame reaching via a forward - // jump. - virtual void Bind(); - - // Setter for expected height. - void set_expected_height(int expected) { expected_height_ = expected; } - - // Uses the current frame to set the expected height. - void SetExpectedHeight(); - - private: - // The expected height of the expression stack where the target will - // be bound, statically known at initialization time. - int expected_height_; -}; - -} } // namespace v8::internal - -#endif // V8_JUMP_TARGET_LIGHT_H_ |