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Author SHA1 Message Date
Derek Schuff b7d6d9e3cd [WebAssembly] Fix CFI index to account for padding nullptr function 
The WebAssembly linker now creates a dummy function at index 0 to
prevent miscomparisons with the NULL pointer, see
https://github.com/WebAssembly/binaryen/pull/658. Thanks to pcc for
pointing out this problem!

Patch by Dominic Chen

Differential Revision: https://reviews.llvm.org/D23137

llvm-svn: 278073
 2016-08-08 23:56:01 +00:00
Derek Schuff c64d7655b2 [WebAssembly] Support CFI for WebAssembly target 
Summary: This patch implements CFI for WebAssembly. It modifies the
LowerTypeTest pass to pre-assign table indexes to functions that are
called indirectly, and lowers type checks to test against the
appropriate table indexes. It also modifies the WebAssembly backend to
support a special ".indidx" assembly directive that propagates the table
index assignments out to the linker.

Patch by Dominic Chen

Differential Revision: https://reviews.llvm.org/D21768

llvm-svn: 277398
 2016-08-01 22:25:02 +00:00