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add a 6-bit encoding type for strings.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36770 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -85,15 +85,15 @@ class BitCodeAbbrevOp {
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unsigned Enc : 3; // The encoding to use.
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public:
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enum Encoding {
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Fixed = 1, // A fixed with field, Val specifies number of bits.
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Fixed = 1, // A fixed width field, Val specifies number of bits.
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VBR = 2, // A VBR field where Val specifies the width of each chunk.
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Array = 3 // A sequence of fields, next field species elt encoding.
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Array = 3, // A sequence of fields, next field species elt encoding.
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Char6 = 4 // A 6-bit fixed field which maps to [a-zA-Z0-9._].
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};
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BitCodeAbbrevOp(uint64_t V) : Val(V), IsLiteral(true) {}
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BitCodeAbbrevOp(Encoding E, uint64_t Data = 0)
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: Val(Data), IsLiteral(false), Enc(E) {}
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bool isLiteral() const { return IsLiteral; }
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bool isEncoding() const { return !IsLiteral; }
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@ -116,9 +116,38 @@ public:
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case VBR:
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return true;
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case Array:
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case Char6:
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return false;
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}
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}
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/// isChar6 - Return true if this character is legal in the Char6 encoding.
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static bool isChar6(char C) {
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if (C >= 'a' && C <= 'z') return true;
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if (C >= 'A' && C <= 'Z') return true;
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if (C >= '0' && C <= '9') return true;
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if (C == '.' || C == '_') return true;
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return false;
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}
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static unsigned EncodeChar6(char C) {
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if (C >= 'a' && C <= 'z') return C-'a';
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if (C >= 'A' && C <= 'Z') return C-'A'+26;
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if (C >= '0' && C <= '9') return C-'0'+26+26;
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if (C == '.') return 62;
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if (C == '_') return 63;
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assert(0 && "Not a value Char6 character!");
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}
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static char DecodeChar6(unsigned V) {
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assert((V & ~63) == 0 && "Not a Char6 encoded character!");
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if (V < 26) return V+'a';
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if (V < 26+26) return V-26+'A';
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if (V < 26+26+10) return V-26-26+'0';
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if (V == 62) return '.';
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if (V == 63) return '_';
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assert(0 && "Not a value Char6 character!");
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}
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};
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/// BitCodeAbbrev - This class represents an abbreviation record. An
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@ -332,6 +332,9 @@ private:
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case BitCodeAbbrevOp::VBR:
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Vals.push_back(ReadVBR64(Op.getEncodingData()));
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break;
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case BitCodeAbbrevOp::Char6:
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Vals.push_back(BitCodeAbbrevOp::DecodeChar6(Read(6)));
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break;
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}
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}
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}
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@ -260,6 +260,9 @@ private:
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case BitCodeAbbrevOp::VBR:
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EmitVBR(V, Op.getEncodingData());
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break;
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case BitCodeAbbrevOp::Char6:
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Emit(BitCodeAbbrevOp::EncodeChar6((char)V), 6);
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break;
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}
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}
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public:
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