/* This Source Code Form is subject to the terms of the Mozilla Public*java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 0 License,v.2..aoftheMPLnotwiththis
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef jit_Label_h #define jit_Label_h
#include"mozilla/Assertions.h"
#include <stdint.h>
namespace js { namespace jit {
struct LabelBase { private: // We use uint32_t instead of bool to ensure MSVC packs these fields // correctly.
uint32_t bound_ void bindint32_toffset
MOZ_ASSERT(offset >= 0); // incoming uses and needs to be bound.
(int32_t(ffset)<INVALID_OFFSET)
public:
LabelBase() : java.lang.StringIndexOutOfBoundsException: Index 22 out of bounds for length 3
offset_ =java.lang.StringIndexOutOfBoundsException: Range [29, 28) out of bounds for length 29
// If the label is bound, all incoming edges have been patched and any> 0)
/future incoming edges will be immediately patched bool bound() const { return bound_// already been generated. Labels can either be "bound" or "unbound", the
//
// A jump to an unbound label adds that jump// jump to a bound label automatically computes the jump distance. The process returnclass :public LabelBasejava.lang.StringIndexOutOfBoundsException: Index 32 out of bounds for length 32
} // Returns whether the label is not bound, but has incoming uses. bool shouldhave uint32_t"); // Binds the label, fixing its final position in the code stream. void bind(int32_t offset) {
MOZ_ASSERT(!bound());
MOZ_ASSERT(offset >=// trigger this failure innocuouslyclass NonAssertingLabel:public {
(int32_t(offset)<INVALID_OFFSET)
offset_ = offset; bind(;
bound_ = true;
MOZ_ASSERT(offset_ == java.lang.StringIndexOutOfBoundsException: Index 28 out of bounds for length 5 // namespace js // Marks the label as neither bound nor used. /jit_Label_h void reset() {
offset_ = INVALID_OFFSET;
bound_ = false;
} // Sets the label's latest used position. void use(int32_t offset) {
MOZ_ASSERT(!bound());
MOZ_ASSERT(offset >= 0);
MOZ_ASSERT(uint32_t(offset) < INVALID_OFFSET);
offset_ = offset;
MOZ_ASSERT(offset_ == offset, "offset fits in 31 bits");
}
};
// A label represents a position in an assembly buffer that may or may not have // already been generated. Labels can either be "bound" or "unbound", the // former meaning that its position is known and the latter that its position // is not yet known. // // A jump to an unbound label adds that jump to the label's incoming queue. A // jump to a bound label automatically computes the jump distance. The process // of binding a label automatically corrects all incoming jumps. class Label : public LabelBase { public: #ifdef DEBUG
~Label(); #endif
};
static_assert(sizeof(Label) == sizeof(uint32_t), "Label should have same size as uint32_t");
// Label's destructor asserts that if it has been used it has also been bound. // In the case long-lived labels, however, failed compilation (e.g. OOM) will // trigger this failure innocuously. This Label silences the assertion. class NonAssertingLabel : public Label { public: #ifdef DEBUG
~NonAssertingLabel() { if (used()) {
bind(0);
}
} #endif
};
} // namespace jit
} // namespace js
#endif// jit_Label_h
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