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Add ARM bitcode file magic. 

llvm-svn: 96006
This commit is contained in:
Evan Cheng 2010-02-12 20:13:44 +00:00
parent 2b75de97c0
commit 9aa30fbe02
1 changed files with 32 additions and 3 deletions
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35
llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
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@ -1510,16 +1510,43 @@ enum {
DarwinBCHeaderSize = 5*4
};
/// isARMTriplet - Return true if the triplet looks like:
/// arm-*, thumb-*, armv[0-9]-*, thumbv[0-9]-*
static bool isARMTriplet(const std::string &TT) {
size_t Pos = 0;
size_t Size = TT.size();
if (Size >= 6 &&
TT[0] == 't' && TT[1] == 'h' && TT[2] == 'u' &&
TT[3] == 'm' && TT[4] == 'b')
Pos = 5;
else if (Size >= 4 && TT[0] == 'a' && TT[1] == 'r' && TT[2] == 'm')
Pos = 3;
else
return false;
if (TT[Pos] == '-')
return true;
else if (TT[Pos] != 'v')
return false;
while (++Pos < Size && TT[Pos] != '-') {
if (!isdigit(TT[Pos]))
return false;
}
return true;
}
static void EmitDarwinBCHeader(BitstreamWriter &Stream,
const std::string &TT) {
unsigned CPUType = ~0U;
// Match x86_64-*, i[3-9]86-*, powerpc-*, powerpc64-*. The CPUType is a
// magic number from /usr/include/mach/machine.h. It is ok to reproduce the
// specific constants here because they are implicitly part of the Darwin ABI.
// Match x86_64-*, i[3-9]86-*, powerpc-*, powerpc64-*, arm-*, thumb-*,
// armv[0-9]-*, thumbv[0-9]-*. The CPUType is a magic number from
// /usr/include/mach/machine.h. It is ok to reproduce the specific constants
// here because they are implicitly part of the Darwin ABI.
enum {
DARWIN_CPU_ARCH_ABI64 = 0x01000000,
DARWIN_CPU_TYPE_X86 = 7,
DARWIN_CPU_TYPE_ARM = 12,
DARWIN_CPU_TYPE_POWERPC = 18
};
@ -1532,6 +1559,8 @@ static void EmitDarwinBCHeader(BitstreamWriter &Stream,
CPUType = DARWIN_CPU_TYPE_POWERPC;
else if (TT.find("powerpc64-") == 0)
CPUType = DARWIN_CPU_TYPE_POWERPC | DARWIN_CPU_ARCH_ABI64;
else if (isARMTriplet(TT))
CPUType = DARWIN_CPU_TYPE_ARM;
// Traditional Bitcode starts after header.
unsigned BCOffset = DarwinBCHeaderSize;