similar to: [LLVMdev] Stack Management in LLVM

On Thu, Jul 16, 2009 at 9:29 PM, Joshua Moore-Oliva<llvm-dev at chatgris.com> wrote: > To the list of modifications I need to be able to perform, add > > the ability to specify the ordering of local variables in the stack If you need specific locations for everything you're allocating on the stack, you should probably just use a continuation-passing style like the one mentioned

If I could reduce my requirements to the ability to the following: * Ability to know how much stack space a function requires * Move the stack pointer arbitrarily (the ability to write my own function prologue and epilogue, would need to be able to insert assembly/low level code here) before and after a method call could LLVM do that for me, using the system stack, (not continuations

To the list of modifications I need to be able to perform, add the ability to specify the ordering of local variables in the stack the ability to have one thread access the contents of another thread's stack. There may be more I am forgetting, so simply put I need to be able to have complete control over the stack. It's layout, its contents etc.

On Thu, Jul 23, 2009 at 4:06 PM, Joshua Moore-Oliva<llvm-dev at chatgris.com> wrote: > If I could reduce my requirements to the ability to the following: >    * Ability to know how much stack space a function requires >    * Move the stack pointer arbitrarily (the ability to write my own function > prologue and epilogue, would need to be able to insert assembly/low level >

First off, thanks for the help so far. >From what I have been able to tell, emitPrologue kicks in after the arguments for the function have been copied. For example, consider the function int testfunc( int foo, int bar ); Emitting assembly code from the llvm-gcc frontend in a small test program gives the following for the call to testfunc movl $1338, (%esp) movl $1339, 4(%esp) call

William Morgan wrote: > Hi all, > > At the bottom of chapter 8 of the tutorial, on the topic of closures, > mentions that there are "often better ways to implement these features > than explicit stack frames". Does anyone know what techniques this > cryptic statement might be referring to? > > Thanks! > I would say it means to have a "stackless"

Just out of curiosity, now that explicitly managed stack frames [1] are possible (given support in the code generators), is the stack register freed for other uses when the LLVM system stack isn't being used? Sandro [1] http://nondot.org/sabre/LLVMNotes/ExplicitlyManagedStackFrames.txt

> [1] http://nondot.org/sabre/LLVMNotes/ExplicitlyManagedStackFrames.txt Interesting. Something like this is more then sufficient for implementing by value structure passing at the llvm level :-) Cheers, -- Rafael Avila de Espindola Google Ireland Ltd. Gordon House Barrow Street Dublin 4 Ireland Registered in Dublin, Ireland Registration Number: 368047

Hi all, At the bottom of chapter 8 of the tutorial, on the topic of closures, mentions that there are "often better ways to implement these features than explicit stack frames". Does anyone know what techniques this cryptic statement might be referring to? Thanks! -- William <wmorgan-llvm at masanjin.net>

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I was wondering what the current state of this (explicitly managed stack frames) is. Is it being worked on? If not, how hard do you think it would be for me to add it? I am more than willing to work on it, but don't have any experience with LLVM, so it might take a while. The reason I ask is because I am starting work on a project to make a language similar to ML with which to experiment,

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