Summary:
With this patch, llgo uses ssautil.Switches
to reconstitute (and synthesise) switches,
which can then be lowered to lookup tables,
trees, etc.
We currently only handle integer const case
switches. We erase the comparison blocks (other
than the initial block), and generate a switch
instruction at the end of the block starting
the if-else-if chain. ssautil.Switches does
not remove duplicate const cases (e.g. same
operands for "||"), so we do this in llgo for
now.
Test Plan: lit test added
Reviewers: pcc
Reviewed By: pcc
Subscribers: llvm-commits
Differential Revision: http://reviews.llvm.org/D6831
llvm-svn: 225433
Summary: If a receive case in a select statement is not assigned to a named variable, then we can eliminate the alloca and copy at runtime.
Test Plan: lit test added
Reviewers: pcc
Reviewed By: pcc
Subscribers: llvm-commits
Differential Revision: http://reviews.llvm.org/D6785
llvm-svn: 225033
The new ABI is simpler for use cases such as dynamically loaded packages.
The calling convention for import functions is similar to what go/ssa would
produce if BareInits were cleared. However, simply clearing this flag causes
two additional issues:
1) We would need to special case the 'init$guard' variable (see
discussion in https://codereview.appspot.com/78780043/).
2) The call to __go_register_gc_roots needs to appear in the right
place, i.e. after the guard check. Making this check appear
in the right place with non-bare inits seems unreliable at best.
So we keep BareInits set and generate the necessary code manually.
It is still possible to get the old ABI by specifying a path to a gccgo
installation.
Differential Revision: http://reviews.llvm.org/D6804
llvm-svn: 225030
This is useful for clients that need to use llgo's mangling of the package
path to look up a specific function within a given package.
Differential Revision: http://reviews.llvm.org/D6801
llvm-svn: 225027
This change allows clients to generate IR using "files" received from locations
other than the file system. The regular file parser is moved to a new library,
"driver", which is intended to eventually contain much of the logic from
the existing driver.
Differential Revision: http://reviews.llvm.org/D6794
llvm-svn: 225026
multilib build and installs.
Summary:
This requires introducing a generated header to encapsulate the
LLVM_LIBDIR_SUFFIX value from the build system and push it into the go
code. From there, I've adjusted the gllgo code to systematically use
this rather than a raw "lib". This requires some awkwardness as one of
the flags *must* be "lib"-relative for compatibility with how gccgo
works. For that flag, we use ".." to back up a directory and then go
into the proper lib directory.
Differential Revision: http://reviews.llvm.org/D6795
llvm-svn: 224964
Patch by Andrew Wilkins!
canAvoidElementLoad and canAvoidLoad were incorrectly
eliding loads when an index expression is used as an
another array index expression. This led to a panic.
See comments on https://github.com/go-llvm/llgo/issues/175
Test Plan: lit test added
Differential Revision: http://reviews.llvm.org/D6676
llvm-svn: 224420
If we use the receiver's package, we can end up with identical manglings
for different functions. Consider:
package p
type U struct{}
func (U) f()
package q
import "p"
type T struct { p.U }
func (T) f()
The method set of *T has two synthetic methods named (*T).f(); one forwards to
(T).f(), and the other to (U).f(). Previously, we were distinguishing them
by the receiver's package, and in this case because both methods have the
same receiver, they received the same name.
The methods are correctly distinguished by the package owning the identifier
"f", which is available via f.Object().Pkg().
Differential Revision: http://reviews.llvm.org/D6673
llvm-svn: 224357
Andrew Wilkins