Jim Blandy 4778b96a85 Bug 480132: Clone lexical blocks only when needed. r=igor ... Terminology: A "script block" is an object of class Block allocated by the byte compiler and associated with a script. Script blocks are never modified, and may be used as a prototype for a "closure block": A "closure block" is an object of class Block that holds variables that have been closed over (although we actually leave the variables on the stack until we leave their dynamic scope). A closure block is a clone of a script block (its prototype is a script block). Adjust the meanings of fp->blockChain and fp->scopeChain: fp->blockChain is always the innermost script block in whose static scope we're executing. fp->scopeChain is the current scope chain, including 'call' objects and closure blocks for those function calls and blocks in whose static scope we are currently executing, and 'with' objects for with statements; the chain is typically terminated by a global object. However, as an optimization, the young end of the chain omits block objects we have not yet needed to clone. Closures need fully reified scope chains, so have js_GetScopeChain reify any closure blocks missing from the young end of fp->scopeChain by cloning script blocks as needed from fp->blockChain. Thus, if we never actually close over a particular block, we never place a closure block for it on fp->scopeChain. Have JSOP_ENTERBLOCK and JSOP_LEAVEBLOCK always keep fp->blockChain current. When JSOP_LEAVEBLOCK pops a block from fp->blockChain that has been cloned on fp->scopeChain, pop fp->scopeChain as well. Remove the JSFRAME_POP_BLOCKS flag, as it is no longer needed. Ensure that the JIT won't have to create closure blocks or call js_PutBlockObject; it can't handle those things yet. Note our current script block when we begin recording. Abort recording if we leave that block; we can't tell in advance whether it will need to be "put" in future trace invocations. Abort recording if we call js_GetScopeChain while in the static scope of lexical blocks. Remove JIT tests based on JSFRAME_POP_BLOCKS. Verify that generators capture the correct value for blockChain. Add a constructor to JSAutoTempValueRooter for rooting JSObject pointers.		2009-03-13 23:43:32 -07:00
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jsd	Bug 482809 Crash [@ jsds_SyncFilter(FilterRecord*, jsdIFilter*) ] when appendFilter() called with Console2 installed	2009-03-12 13:04:48 +01:00
narcissus
src	Bug 480132: Clone lexical blocks only when needed. r=igor	2009-03-13 23:43:32 -07:00
tests	bug 481766 - update JavaScript Test failures.	2009-03-05 17:15:13 -08:00
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