sammine_lang::AST::ShadowGarbageCollector Class Reference

Public Member Functions
	ShadowGarbageCollector (LLVMRes &resPtr)
virtual std::string	llvmStrategy ()
llvm::GlobalVariable *	getFrameMapForCallee (FuncDefAST *)
	Insert a FrameMap in the beginning of each function.
void	applyStrategy (llvm::Function *f)
void	setStackEntry (FuncDefAST *callee, llvm::Function *llvm_callee)
void	relieveStackEntry ()
void	initGlobalRootChain ()
void	initGCFunc ()

Member Function Documentation

getFrameMapForCallee()

llvm::GlobalVariable * sammine_lang::AST::ShadowGarbageCollector::getFrameMapForCallee

(

FuncDefAST *

callee

)

Insert a FrameMap in the beginning of each function.

The map for a single function's stack frame. One of these is compiled as constant data into the executable for each function. INFO: from Jasmine: Ok, this is set up so that it scales into a future where we not only stores the NumRoots but also the meta data for each root.

INFO: Right now, we only have NumRoots so it might seem wasteful but in a far future, this will be more efficient. I just don't want to incorporate NumRoots straight into stack entry now so later i have to rewrite all this

Storage of metadata values is elided if the metadata parameter to @llvm.gcroot is null.

initGCFunc()

void sammine_lang::AST::ShadowGarbageCollector::initGCFunc

(

)

Calls Visitor(root, meta) for each GC root on the stack. root and meta are exactly the values passed to @llvm.gcroot.

Visitor could be a function to recursively mark live objects. Or it might copy them to another heap or generation.

Parameters

Visitor

A function to invoke for every GC root on the stack.

initGlobalRootChain()

void sammine_lang::AST::ShadowGarbageCollector::initGlobalRootChain

(

)

The head of the singly-linked list of StackEntries. Functions push and pop onto this in their prologue and epilogue.

Since there is only a global list, this technique is not threadsafe.

setStackEntry()

void sammine_lang::AST::ShadowGarbageCollector::setStackEntry	(	FuncDefAST *	callee,
		llvm::Function *	llvm_callee )

INFO: We'll set the global curr_stack_entry->next to be the caller, We'll also set the curr_stack_entry->frame_map to be the callee's frame map

INFO: this will require us to keep a map of string to FrameMap in the ShadowGarbageCollector class. For more details, see createFrameMap

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The documentation for this class was generated from the following files:

• include/codegen/Garbage.h
• src/codegen/Garbage.cpp