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[RuntimeDyld] Track symbol visibility in RuntimeDyld.

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RuntimeDyld symbol info previously consisted of just a Section/Offset pair. This
patch replaces that pair type with a SymbolInfo class that also tracks symbol
visibility. A new method, RuntimeDyld::getExportedSymbolLoadAddress, is
introduced which only returns a non-zero result for exported symbols. For
non-exported or non-existant symbols this method will return zero. The
RuntimeDyld::getSymbolAddress method retains its current behavior, returning
non-zero results for all symbols regardless of visibility.

No in-tree clients of RuntimeDyld are changed. The newly introduced
functionality will be used by the Orc APIs.

No test case: Since this patch doesn't modify the behavior for any in-tree
clients we don't have a good tool to test this with yet. Once Orc is in we can
use it to write regression tests that test these changes.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226341 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Lang Hames
2015-01-16 23:13:56 +00:00
parent b2bb846f17
commit 61bd005d1b
6 changed files with 95 additions and 40 deletions
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8
include/llvm/ExecutionEngine/RuntimeDyld.h
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@@ -81,10 +81,14 @@ public:
/// and resolve relocatons based on where they put it).
void *getSymbolAddress(StringRef Name) const;
/// Get the address of the target copy of the symbol. This is the address
/// used for relocation.
/// Get the address of the target copy of the symbol (works for both exported
/// and non-exported symbols). This is the address used for relocation.
uint64_t getSymbolLoadAddress(StringRef Name) const;
/// Get the address of the target copy of the symbol (works for exported
/// symbols only). This is the address used for relocation.
uint64_t getExportedSymbolLoadAddress(StringRef Name) const;
/// Resolve the relocations for all symbols we currently know about.
void resolveRelocations();