tree 4da883c2fc51d75dcfc3ffee7e766cb5d8b68b94
parent ac078dcb1c677f83527693536cb1c06157095447
author jgravelle-google <jgravelle@google.com> 1473892377 -0700
committer GitHub <noreply@github.com> 1473892377 -0700

In AsmConstWalker, don't assume a segment exists (#697)

It's possible to generate an EM_ASM call with empty contents (due to
ifdefs, for example), and this gets converted to an empty string.
AsmConstWalker assumes that by this point any addresses it is pointing
to have a corresponding data section, which is reasonable. However in
the case of an empty string, we don't create a data section, but just
leave that address uninitialized, i.e. set to 0.
In the case of AsmConstWalker, a correct thing to do is to emit the
empty string as metadata, which becomes an empty emscripten_asm_v call.