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Generate compact unwind encoding from CFI directives.

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We used to generate the compact unwind encoding from the machine
instructions. However, this had the problem that if the user used `-save-temps'
or compiled their hand-written `.s' file (with CFI directives), we wouldn't
generate the compact unwind encoding.

Move the algorithm that generates the compact unwind encoding into the
MCAsmBackend. This way we can generate the encoding whether the code is from a
`.ll' or `.s' file.

<rdar://problem/13623355>


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190290 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling
2013-09-09 02:37:14 +00:00
parent 959cd8f49b
commit c3cee57f7d
25 changed files with 454 additions and 363 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/CodeGen/LLVMTargetMachine.cpp
+4 -3
View File
@@ -178,7 +178,7 @@ bool LLVMTargetMachine::addPassesToEmitFile(PassManagerBase &PM,
MCAsmBackend *MAB = 0;
if (ShowMCEncoding) {
MCE = getTarget().createMCCodeEmitter(MII, MRI, STI, *Context);
MAB = getTarget().createMCAsmBackend(getTargetTriple(), TargetCPU);
MAB = getTarget().createMCAsmBackend(MRI, getTargetTriple(), TargetCPU);
}
MCStreamer *S = getTarget().createAsmStreamer(*Context, Out,
@@ -197,7 +197,7 @@ bool LLVMTargetMachine::addPassesToEmitFile(PassManagerBase &PM,
// emission fails.
MCCodeEmitter *MCE = getTarget().createMCCodeEmitter(MII, MRI, STI,
*Context);
MCAsmBackend *MAB = getTarget().createMCAsmBackend(getTargetTriple(),
MCAsmBackend *MAB = getTarget().createMCAsmBackend(MRI, getTargetTriple(),
TargetCPU);
if (MCE == 0 || MAB == 0)
return true;
@@ -271,7 +271,8 @@ bool LLVMTargetMachine::addPassesToEmitMC(PassManagerBase &PM,
const MCSubtargetInfo &STI = getSubtarget<MCSubtargetInfo>();
MCCodeEmitter *MCE = getTarget().createMCCodeEmitter(*getInstrInfo(), MRI,
STI, *Ctx);
MCAsmBackend *MAB = getTarget().createMCAsmBackend(getTargetTriple(), TargetCPU);
MCAsmBackend *MAB = getTarget().createMCAsmBackend(MRI, getTargetTriple(),
TargetCPU);
if (MCE == 0 || MAB == 0)
return true;