6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-08-18 12:29:21 +00:00
Code Issues Projects Releases Wiki Activity

add a 6-bit encoding type for strings.

Browse Source 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36770 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-05-05 01:15:42 +00:00
parent 7a263ea859
commit 28e4c4c9b3
3 changed files with 38 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
include/llvm/Bitcode/BitCodes.h
View File

@ -85,15 +85,15 @@ class BitCodeAbbrevOp {
unsigned Enc : 3; // The encoding to use.
public:
enum Encoding {
Fixed = 1, // A fixed with field, Val specifies number of bits.
Fixed = 1, // A fixed width field, Val specifies number of bits.
VBR = 2, // A VBR field where Val specifies the width of each chunk.
Array = 3 // A sequence of fields, next field species elt encoding.
Array = 3, // A sequence of fields, next field species elt encoding.
Char6 = 4 // A 6-bit fixed field which maps to [a-zA-Z0-9._].
};
BitCodeAbbrevOp(uint64_t V) : Val(V), IsLiteral(true) {}
BitCodeAbbrevOp(Encoding E, uint64_t Data = 0)
: Val(Data), IsLiteral(false), Enc(E) {}
bool isLiteral() const { return IsLiteral; }
bool isEncoding() const { return !IsLiteral; }
@ -116,9 +116,38 @@ public:
case VBR:
return true;
case Array:
case Char6:
return false;
}
}
/// isChar6 - Return true if this character is legal in the Char6 encoding.
static bool isChar6(char C) {
if (C >= 'a' && C <= 'z') return true;
if (C >= 'A' && C <= 'Z') return true;
if (C >= '0' && C <= '9') return true;
if (C == '.' || C == '_') return true;
return false;
}
static unsigned EncodeChar6(char C) {
if (C >= 'a' && C <= 'z') return C-'a';
if (C >= 'A' && C <= 'Z') return C-'A'+26;
if (C >= '0' && C <= '9') return C-'0'+26+26;
if (C == '.') return 62;
if (C == '_') return 63;
assert(0 && "Not a value Char6 character!");
}
static char DecodeChar6(unsigned V) {
assert((V & ~63) == 0 && "Not a Char6 encoded character!");
if (V < 26) return V+'a';
if (V < 26+26) return V-26+'A';
if (V < 26+26+10) return V-26-26+'0';
if (V == 62) return '.';
if (V == 63) return '_';
assert(0 && "Not a value Char6 character!");
}
};
/// BitCodeAbbrev - This class represents an abbreviation record. An

3
include/llvm/Bitcode/BitstreamReader.h
View File

@ -332,6 +332,9 @@ private:
case BitCodeAbbrevOp::VBR:
Vals.push_back(ReadVBR64(Op.getEncodingData()));
break;
case BitCodeAbbrevOp::Char6:
Vals.push_back(BitCodeAbbrevOp::DecodeChar6(Read(6)));
break;
}
}
}

3
include/llvm/Bitcode/BitstreamWriter.h
View File

@ -260,6 +260,9 @@ private:
case BitCodeAbbrevOp::VBR:
EmitVBR(V, Op.getEncodingData());
break;
case BitCodeAbbrevOp::Char6:
Emit(BitCodeAbbrevOp::EncodeChar6((char)V), 6);
break;
}
}
public: