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91fd65c3a6
Summary: The `"patchable-function"` attribute can be used by an LLVM client to influence LLVM's code generation in ways that makes the generated code easily patchable at runtime (for instance, to redirect control). Right now only one patchability scheme is supported, `"prologue-short-redirect"`, but this can be expanded in the future. Reviewers: joker.eph, rnk, echristo, dberris Subscribers: joker.eph, echristo, mcrosier, llvm-commits Differential Revision: http://reviews.llvm.org/D19046 llvm-svn: 266715
44 lines
1.4 KiB
TableGen
44 lines
1.4 KiB
TableGen
// RUN: llvm-tblgen -gen-disassembler -I %p/../../include %s | FileCheck %s
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// Check that if decoding of an instruction fails and the instruction does not
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// have a complete decoder method that can determine if the bitpattern is valid
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// or not then the decoder tries to find a more general instruction that
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// matches the bitpattern too.
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include "llvm/Target/Target.td"
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def archInstrInfo : InstrInfo { }
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def arch : Target {
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let InstructionSet = archInstrInfo;
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}
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class TestInstruction : Instruction {
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let Size = 1;
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let OutOperandList = (outs);
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let InOperandList = (ins);
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field bits<8> Inst;
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field bits<8> SoftFail = 0;
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}
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def InstA : TestInstruction {
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let Inst = {0,0,0,0,?,?,?,?};
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let AsmString = "InstA";
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}
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def InstB : TestInstruction {
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let Inst = {0,0,0,0,0,0,?,?};
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let AsmString = "InstB";
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let DecoderMethod = "DecodeInstB";
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let hasCompleteDecoder = 0;
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}
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// CHECK: /* 0 */ MCD::OPC_ExtractField, 4, 4, // Inst{7-4} ...
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// CHECK-NEXT: /* 3 */ MCD::OPC_FilterValue, 0, 14, 0, // Skip to: 21
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// CHECK-NEXT: /* 7 */ MCD::OPC_CheckField, 2, 2, 0, 5, 0, // Skip to: 18
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// CHECK-NEXT: /* 13 */ MCD::OPC_TryDecode, 27, 0, 0, 0, // Opcode: InstB, skip to: 18
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// CHECK-NEXT: /* 18 */ MCD::OPC_Decode, 26, 1, // Opcode: InstA
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// CHECK-NEXT: /* 21 */ MCD::OPC_Fail,
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// CHECK: if (DecodeInstB(MI, insn, Address, Decoder) == MCDisassembler::Fail) { DecodeComplete = false; return MCDisassembler::Fail; }
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