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Add a new attribute called 'jumptable' that creates jump-instruction tables for functions marked with this attribute.

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It includes a pass that rewrites all indirect calls to jumptable functions to pass through these tables.

This also adds backend support for generating the jump-instruction tables on ARM and X86.
Note that since the jumptable attribute creates a second function pointer for a
function, any function marked with jumptable must also be marked with unnamed_addr.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210280 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tom Roeder
2014-06-05 19:29:43 +00:00
parent 4db3ad47fc
commit 5d0f7af3dc
40 changed files with 1109 additions and 8 deletions
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lib/AsmParser/LLParser.cpp
+3
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@@ -947,6 +947,7 @@ bool LLParser::ParseFnAttributeValuePairs(AttrBuilder &B,
case lltok::kw_builtin: B.addAttribute(Attribute::Builtin); break;
case lltok::kw_cold: B.addAttribute(Attribute::Cold); break;
case lltok::kw_inlinehint: B.addAttribute(Attribute::InlineHint); break;
case lltok::kw_jumptable: B.addAttribute(Attribute::JumpTable); break;
case lltok::kw_minsize: B.addAttribute(Attribute::MinSize); break;
case lltok::kw_naked: B.addAttribute(Attribute::Naked); break;
case lltok::kw_nobuiltin: B.addAttribute(Attribute::NoBuiltin); break;
@@ -1210,6 +1211,7 @@ bool LLParser::ParseOptionalParamAttrs(AttrBuilder &B) {
case lltok::kw_alwaysinline:
case lltok::kw_builtin:
case lltok::kw_inlinehint:
case lltok::kw_jumptable:
case lltok::kw_minsize:
case lltok::kw_naked:
case lltok::kw_nobuiltin:
@@ -1271,6 +1273,7 @@ bool LLParser::ParseOptionalReturnAttrs(AttrBuilder &B) {
case lltok::kw_builtin:
case lltok::kw_cold:
case lltok::kw_inlinehint:
case lltok::kw_jumptable:
case lltok::kw_minsize:
case lltok::kw_naked:
case lltok::kw_nobuiltin: