- * Base Contents - * : : ----- - * caller | incoming overflow argument n | ^ - * frame : ... : | positive - * | incoming overflow argument 0 | | offsets - * +--------------------------------+ | - * | | | - * : register save area : | - * | | | - * ---------+--------------------------------+--------------------------- - * | spill slot 0 | | negative ^ ^ - * : ... : v offsets | | - * | spill slot n | ----- total | - * +--------------------------------+ frame | - * current | alignment padding | size | - * frame +--------------------------------+ ----- | | - * | outgoing overflow argument n | ^ | frame - * : ... : | positive | size - * | outgoing overflow argument 0 | | offsets | | - * +--------------------------------+ | | | - * | return address | | | | - * +--------------------------------+ | | | - * | | | | | - * : callee save area : | | | - * | | | v v - * %sp--> +--------------------------------+--------------------------- - * - *- * - * The spill slot area also includes stack allocated memory blocks (ALLOCA blocks). The size of such - * a block may be greater than the size of a normal spill slot or the word size. - *
- * A runtime can reserve space at the beginning of the overflow argument area. The calling - * convention can specify that the first overflow stack argument is not at offset 0, but at a - * specified offset. Use {@link CodeCacheProvider#getMinimumOutgoingSize()} to make sure that - * call-free methods also have this space reserved. Then the VM can use the memory at offset 0 - * relative to the stack pointer. - */ -public final class SPARCFrameMap extends FrameMap { - - public SPARCFrameMap(CodeCacheProvider codeCache, RegisterConfig registerConfig, ReferenceMapBuilderFactory referenceMapFactory) { - super(codeCache, registerConfig, referenceMapFactory); - // Initial spill size is set to register save area size (SPARC register window) - initialSpillSize = 0; - spillSize = initialSpillSize; - } - - @Override - public int totalFrameSize() { - return frameSize(); - } - - @Override - public int currentFrameSize() { - return alignFrameSize(SPARC.REGISTER_SAFE_AREA_SIZE + outgoingSize + spillSize); - } - - /** - * In SPARC we have spill slots word aligned. - */ - @Override - public int spillSlotSize(ValueKind kind) { - return kind.getPlatformKind().getSizeInBytes(); - } - - @Override - public int offsetForStackSlot(StackSlot slot) { - // @formatter:off - assert (!slot.getRawAddFrameSize() && slot.getRawOffset() < outgoingSize + SPARC.REGISTER_SAFE_AREA_SIZE) || - (slot.getRawAddFrameSize() && slot.getRawOffset() < 0 && -slot.getRawOffset() <= spillSize) || - (slot.getRawAddFrameSize() && slot.getRawOffset() >= 0) : - String.format("RawAddFrameSize: %b RawOffset: 0x%x spillSize: 0x%x outgoingSize: 0x%x", slot.getRawAddFrameSize(), slot.getRawOffset(), spillSize, outgoingSize); - // @formatter:on - return super.offsetForStackSlot(slot); - } - - @Override - public boolean frameNeedsAllocating() { - return super.frameNeedsAllocating() || spillSize > 0; - } - - public StackSlot allocateDeoptimizationRescueSlot() { - assert spillSize == initialSpillSize : "Deoptimization rescue slot must be the first stack slot"; - return allocateSpillSlot(LIRKind.value(SPARCKind.XWORD)); - } -}