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LLVM backend for 6502
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Bill Wendling e9bf7e692e Handle code gen for the unreachable instruction if it's the only instruction in 
the function. We'll just turn it into a "trap" instruction instead.

The problem with not handling this is that it might generate a prologue without
the equivalent epilogue to go with it:

$ cat t.ll
define void @foo() {
entry:
  unreachable
}
$ llc -o - t.ll -relocation-model=pic -disable-fp-elim -unwind-tables
        .section        __TEXT,__text,regular,pure_instructions
        .globl  _foo
        .align  4, 0x90
_foo:                                   ## @foo
Leh_func_begin0:
## BB#0:                                ## %entry
        pushq   %rbp
Ltmp0:
        movq    %rsp, %rbp
Ltmp1:
Leh_func_end0:
...

The unwind tables then have bad data in them causing all sorts of problems.

Fixes <rdar://problem/8096481>.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108473 91177308-0d34-0410-b5e6-96231b3b80d8
2010-07-15 23:32:40 +00:00
autoconf Pull in the libCrashReporterClient.a information with a warning comment. 2010-06-28 18:25:51 +00:00
bindings Implement the "linker_private_weak" linkage type. This will be used for 2010-07-01 21:55:59 +00:00
cmake Don't link against libm and libpthread which don't exist in BeOS/Haiku. Also, 2010-06-23 06:48:34 +00:00
docs Don't pass StringRef by reference. 2010-07-14 22:38:02 +00:00
examples Convert some tab stops into spaces. 2010-07-12 08:16:59 +00:00
include Split -enable-finite-only-fp-math to two options: 2010-07-15 22:07:12 +00:00
lib Handle code gen for the unreachable instruction if it's the only instruction in 2010-07-15 23:32:40 +00:00
projects Testing subversion commit access 2010-02-23 15:11:17 +00:00
runtime Delete a blank line. 2010-04-16 13:32:55 +00:00
test Handle code gen for the unreachable instruction if it's the only instruction in 2010-07-15 23:32:40 +00:00
tools Remove some broken code to check the DISABLE_EDIS flag (edis is now in the 2010-07-14 22:41:51 +00:00
unittests Switch from EXPECT_EQ({true,false, ...) to the more canonical 2010-07-13 17:28:05 +00:00
utils Remove the entire docs directory from Apple-style builds. 2010-07-14 23:49:18 +00:00
website Prepare for "core" website. 2007-08-03 05:43:35 +00:00
build-for-llvm-top.sh Patch to build llvm with srcdir != objdir from 2009-01-23 08:42:38 +00:00
CMakeLists.txt Fix LLVM CMake PACKAGE_VERSION variable. 2010-06-25 16:29:14 +00:00
configure Pull in the libCrashReporterClient.a information with a warning comment. 2010-06-28 18:25:51 +00:00
CREDITS.TXT Adding the MicroBlaze backend. 2010-02-23 19:15:24 +00:00
LICENSE.TXT 2010 is upon us. 2010-01-09 18:40:31 +00:00
llvm.spec.in
Makefile Issue the warning about being slow whenever optimization is disabled, 2010-07-07 16:48:16 +00:00
Makefile.common Removed trailing whitespace from Makefiles. 2009-01-09 16:44:42 +00:00
Makefile.config.in typo in comment, regeneration not necessary 2010-07-07 13:58:46 +00:00
Makefile.rules build/Darwin: Add a missing directory dependency. 2010-07-15 21:51:52 +00:00
ModuleInfo.txt Patch to build llvm with srcdir != objdir from 2009-01-23 08:42:38 +00:00
README.txt Give packagers some advice about how to build LLVM so it's useful to 2010-02-26 00:54:42 +00:00

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