v8/src/regexp-macro-assembler.h
erik.corry@gmail.com 260cd876d1 Eliminate the code that handles fallback to JSCRE. The only way to get
JSCRE now is to use the --noirregexp flag.  Also add code to check that
we react sensibly to some very large regexps.
Review URL: http://codereview.chromium.org/18587

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@1166 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2009-01-26 20:09:35 +00:00

231 lines
10 KiB
C++

// 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_REGEXP_MACRO_ASSEMBLER_H_
#define V8_REGEXP_MACRO_ASSEMBLER_H_
namespace v8 { namespace internal {
struct DisjunctDecisionRow {
RegExpCharacterClass cc;
Label* on_match;
};
class RegExpMacroAssembler {
public:
// The implementation must be able to handle at least:
static const int kMaxRegister = (1 << 16) - 1;
static const int kMaxCPOffset = (1 << 15) - 1;
static const int kMinCPOffset = -(1 << 15);
enum IrregexpImplementation {
kIA32Implementation,
kARMImplementation,
kBytecodeImplementation
};
enum StackCheckFlag {
kNoStackLimitCheck = false,
kCheckStackLimit = true
};
RegExpMacroAssembler();
virtual ~RegExpMacroAssembler();
// The maximal number of pushes between stack checks. Users must supply
// kCheckStackLimit flag to push operations (instead of kNoStackLimitCheck)
// at least once for every stack_limit() pushes that are executed.
virtual int stack_limit_slack() = 0;
virtual void AdvanceCurrentPosition(int by) = 0; // Signed cp change.
virtual void AdvanceRegister(int reg, int by) = 0; // r[reg] += by.
// Continues execution from the position pushed on the top of the backtrack
// stack by an earlier PushBacktrack(Label*).
virtual void Backtrack() = 0;
virtual void Bind(Label* label) = 0;
virtual void CheckAtStart(Label* on_at_start) = 0;
// Check the current character against a bitmap. The range of the current
// character must be from start to start + length_of_bitmap_in_bits.
virtual void CheckBitmap(
uc16 start, // The bitmap is indexed from this character.
Label* bitmap, // Where the bitmap is emitted.
Label* on_zero) = 0; // Where to go if the bit is 0. Fall through on 1.
// Dispatch after looking the current character up in a 2-bits-per-entry
// map. The destinations vector has up to 4 labels.
virtual void CheckCharacter(uint32_t c, Label* on_equal) = 0;
// Bitwise and the current character with the given constant and then
// check for a match with c.
virtual void CheckCharacterAfterAnd(uint32_t c,
uint32_t and_with,
Label* on_equal) = 0;
virtual void CheckCharacterGT(uc16 limit, Label* on_greater) = 0;
virtual void CheckCharacterLT(uc16 limit, Label* on_less) = 0;
// Check the current character for a match with a literal string. If we
// fail to match then goto the on_failure label. If check_eos is set then
// the end of input always fails. If check_eos is clear then it is the
// caller's responsibility to ensure that the end of string is not hit.
// If the label is NULL then we should pop a backtrack address off
// the stack and go to that.
virtual void CheckCharacters(
Vector<const uc16> str,
int cp_offset,
Label* on_failure,
bool check_eos) = 0;
virtual void CheckGreedyLoop(Label* on_tos_equals_current_position) = 0;
virtual void CheckNotAtStart(Label* on_not_at_start) = 0;
virtual void CheckNotBackReference(int start_reg, Label* on_no_match) = 0;
virtual void CheckNotBackReferenceIgnoreCase(int start_reg,
Label* on_no_match) = 0;
// Check the current character for a match with a literal character. If we
// fail to match then goto the on_failure label. End of input always
// matches. If the label is NULL then we should pop a backtrack address off
// the stack and go to that.
virtual void CheckNotCharacter(uint32_t c, Label* on_not_equal) = 0;
virtual void CheckNotCharacterAfterAnd(uint32_t c,
uint32_t and_with,
Label* on_not_equal) = 0;
// Subtract a constant from the current character, then or with the given
// constant and then check for a match with c.
virtual void CheckNotCharacterAfterMinusAnd(uc16 c,
uc16 minus,
uc16 and_with,
Label* on_not_equal) = 0;
virtual void CheckNotRegistersEqual(int reg1,
int reg2,
Label* on_not_equal) = 0;
// Checks whether the given offset from the current position is before
// the end of the string. May overwrite the current character.
virtual void CheckPosition(int cp_offset, Label* on_outside_input) {
LoadCurrentCharacter(cp_offset, on_outside_input, true);
}
// Check whether a standard/default character class matches the current
// character. Returns false if the type of special character class does
// not have custom support.
// May clobber the current loaded character.
virtual bool CheckSpecialCharacterClass(uc16 type,
int cp_offset,
bool check_offset,
Label* on_no_match) {
return false;
}
// Dispatch after looking the current character up in a byte map. The
// destinations vector has up to 256 labels.
virtual void DispatchByteMap(
uc16 start,
Label* byte_map,
const Vector<Label*>& destinations) = 0;
virtual void DispatchHalfNibbleMap(
uc16 start,
Label* half_nibble_map,
const Vector<Label*>& destinations) = 0;
// Dispatch after looking the high byte of the current character up in a byte
// map. The destinations vector has up to 256 labels.
virtual void DispatchHighByteMap(
byte start,
Label* byte_map,
const Vector<Label*>& destinations) = 0;
virtual void EmitOrLink(Label* label) = 0;
virtual void Fail() = 0;
virtual Handle<Object> GetCode(Handle<String> source) = 0;
virtual void GoTo(Label* label) = 0;
// Check whether a register is >= a given constant and go to a label if it
// is. Backtracks instead if the label is NULL.
virtual void IfRegisterGE(int reg, int comparand, Label* if_ge) = 0;
// Check whether a register is < a given constant and go to a label if it is.
// Backtracks instead if the label is NULL.
virtual void IfRegisterLT(int reg, int comparand, Label* if_lt) = 0;
// Check whether a register is == to the current position and go to a
// label if it is.
virtual void IfRegisterEqPos(int reg, Label* if_eq) = 0;
virtual IrregexpImplementation Implementation() = 0;
virtual void LoadCurrentCharacter(int cp_offset,
Label* on_end_of_input,
bool check_bounds = true,
int characters = 1) = 0;
virtual void PopCurrentPosition() = 0;
virtual void PopRegister(int register_index) = 0;
// Pushes the label on the backtrack stack, so that a following Backtrack
// will go to this label. Always checks the backtrack stack limit.
virtual void PushBacktrack(Label* label) = 0;
virtual void PushCurrentPosition() = 0;
virtual void PushRegister(int register_index,
StackCheckFlag check_stack_limit) = 0;
virtual void ReadCurrentPositionFromRegister(int reg) = 0;
virtual void ReadStackPointerFromRegister(int reg) = 0;
virtual void SetRegister(int register_index, int to) = 0;
virtual void Succeed() = 0;
virtual void WriteCurrentPositionToRegister(int reg, int cp_offset) = 0;
virtual void ClearRegisters(int reg_from, int reg_to) = 0;
virtual void WriteStackPointerToRegister(int reg) = 0;
private:
};
struct ArraySlice {
public:
ArraySlice(Handle<ByteArray> array, size_t offset)
: array_(array), offset_(offset) {}
Handle<ByteArray> array() { return array_; }
// Offset in the byte array data.
size_t offset() { return offset_; }
// Offset from the ByteArray pointer.
size_t base_offset() {
return ByteArray::kHeaderSize - kHeapObjectTag + offset_;
}
void* location() {
return reinterpret_cast<void*>(array_->GetDataStartAddress() + offset_);
}
template <typename T>
T& at(int idx) {
return reinterpret_cast<T*>(array_->GetDataStartAddress() + offset_)[idx];
}
private:
Handle<ByteArray> array_;
size_t offset_;
};
class ByteArrayProvider {
public:
explicit ByteArrayProvider(unsigned int initial_size);
// Provides a place to put "size" elements of size "element_size".
// The information can be stored in the provided ByteArray at the "offset".
// The offset is aligned to the element size.
ArraySlice GetBuffer(unsigned int size,
unsigned int element_size);
template <typename T>
ArraySlice GetBuffer(Vector<T> values);
private:
size_t byte_array_size_;
Handle<ByteArray> current_byte_array_;
int current_byte_array_free_offset_;
};
} } // namespace v8::internal
#endif // V8_REGEXP_MACRO_ASSEMBLER_H_