| /* Register note definitions. |
| Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
| Free Software Foundation, Inc. |
| |
| This file is part of GCC. |
| |
| GCC is free software; you can redistribute it and/or modify it under |
| the terms of the GNU General Public License as published by the Free |
| Software Foundation; either version 3, or (at your option) any later |
| version. |
| |
| GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
| WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GCC; see the file COPYING3. If not see |
| <http://www.gnu.org/licenses/>. */ |
| |
| /* This file defines all the codes that may appear on individual |
| EXPR_LIST rtxes in the REG_NOTES chain of an insn. The codes are |
| stored in the mode field of the EXPR_LIST. Source files define |
| DEF_REG_NOTE appropriately before including this file. */ |
| |
| /* Shorthand. */ |
| #define REG_NOTE(NAME) DEF_REG_NOTE (REG_##NAME) |
| |
| /* REG_DEP_TRUE is used in scheduler dependencies lists to represent a |
| read-after-write dependency (i.e. a true data dependency). This is |
| here, not grouped with REG_DEP_ANTI and REG_DEP_OUTPUT, because some |
| passes use a literal 0 for it. */ |
| REG_NOTE (DEP_TRUE) |
| |
| /* The value in REG dies in this insn (i.e., it is not needed past |
| this insn). If REG is set in this insn, the REG_DEAD note may, |
| but need not, be omitted. */ |
| REG_NOTE (DEAD) |
| |
| /* The REG is autoincremented or autodecremented in this insn. */ |
| REG_NOTE (INC) |
| |
| /* Describes the insn as a whole; it says that the insn sets a |
| register to a constant value or to be equivalent to a memory |
| address. If the register is spilled to the stack then the constant |
| value should be substituted for it. The contents of the REG_EQUIV |
| is the constant value or memory address, which may be different |
| from the source of the SET although it has the same value. A |
| REG_EQUIV note may also appear on an insn which copies a register |
| parameter to a pseudo-register, if there is a memory address which |
| could be used to hold that pseudo-register throughout the function. */ |
| REG_NOTE (EQUIV) |
| |
| /* Like REG_EQUIV except that the destination is only momentarily |
| equal to the specified rtx. Therefore, it cannot be used for |
| substitution; but it can be used for cse. */ |
| REG_NOTE (EQUAL) |
| |
| /* The register is always nonnegative during the containing loop. |
| This is used in branches so that decrement and branch instructions |
| terminating on zero can be matched. There must be an insn pattern |
| in the md file named `decrement_and_branch_until_zero' or else this |
| will never be added to any instructions. */ |
| REG_NOTE (NONNEG) |
| |
| /* Identifies a register set in this insn and never used. */ |
| REG_NOTE (UNUSED) |
| |
| /* REG_CC_SETTER and REG_CC_USER link a pair of insns that set and use |
| CC0, respectively. Normally, these are required to be consecutive |
| insns, but we permit putting a cc0-setting insn in the delay slot |
| of a branch as long as only one copy of the insn exists. In that |
| case, these notes point from one to the other to allow code |
| generation to determine what any require information and to |
| properly update CC_STATUS. These notes are INSN_LISTs. */ |
| REG_NOTE (CC_SETTER) |
| REG_NOTE (CC_USER) |
| |
| /* Points to a CODE_LABEL. Used by JUMP_INSNs to say that the CODE_LABEL |
| contained in the REG_LABEL_TARGET note is a possible jump target of |
| this insn. This note is an INSN_LIST. */ |
| REG_NOTE (LABEL_TARGET) |
| |
| /* Points to a CODE_LABEL. Used by any insn to say that the CODE_LABEL |
| contained in the REG_LABEL_OPERAND note is used by the insn, but as an |
| operand, not as a jump target (though it may indirectly be a jump |
| target for a later jump insn). This note is an INSN_LIST. */ |
| REG_NOTE (LABEL_OPERAND) |
| |
| /* REG_DEP_OUTPUT and REG_DEP_ANTI are used in scheduler dependencies lists |
| to represent write-after-write and write-after-read dependencies |
| respectively. */ |
| REG_NOTE (DEP_OUTPUT) |
| REG_NOTE (DEP_ANTI) |
| |
| /* REG_BR_PROB is attached to JUMP_INSNs and CALL_INSNs. It has an |
| integer value. For jumps, it is the probability that this is a |
| taken branch. For calls, it is the probability that this call |
| won't return. */ |
| REG_NOTE (BR_PROB) |
| |
| /* REG_VALUE_PROFILE is attached when the profile is read in to an |
| insn before that the code to profile the value is inserted. It |
| contains the results of profiling. */ |
| REG_NOTE (VALUE_PROFILE) |
| |
| /* Attached to a call insn; indicates that the call is malloc-like and |
| that the pointer returned cannot alias anything else. */ |
| REG_NOTE (NOALIAS) |
| |
| /* REG_BR_PRED is attached to JUMP_INSNs and CALL_INSNSs. It contains |
| CONCAT of two integer value. First specifies the branch predictor |
| that added the note, second specifies the predicted hitrate of |
| branch in the same format as REG_BR_PROB note uses. */ |
| REG_NOTE (BR_PRED) |
| |
| /* Attached to insns that are RTX_FRAME_RELATED_P, but are too complex |
| for DWARF to interpret what they imply. The attached rtx is used |
| instead of intuition. */ |
| REG_NOTE (FRAME_RELATED_EXPR) |
| |
| /* Attached to insns that are RTX_FRAME_RELATED_P, but are too complex |
| for FRAME_RELATED_EXPR intuition. The insn's first pattern must be |
| a SET, and the destination must be the CFA register. The attached |
| rtx is an expression that defines the CFA. In the simplest case, the |
| rtx could be just the stack_pointer_rtx; more common would be a PLUS |
| with a base register and a constant offset. In the most complicated |
| cases, this will result in a DW_CFA_def_cfa_expression with the rtx |
| expression rendered in a dwarf location expression. */ |
| REG_NOTE (CFA_DEF_CFA) |
| |
| /* Attached to insns that are RTX_FRAME_RELATED_P, but are too complex |
| for FRAME_RELATED_EXPR intuition. This note adjusts the expression |
| from which the CFA is computed. The attached rtx defines a new CFA |
| expression, relative to the old CFA expression. This rtx must be of |
| the form (SET new-cfa-reg (PLUS old-cfa-reg const_int)). If the note |
| rtx is NULL, we use the first SET of the insn. */ |
| REG_NOTE (CFA_ADJUST_CFA) |
| |
| /* Similar to FRAME_RELATED_EXPR, with the additional information that |
| this is a save to memory, i.e. will result in DW_CFA_offset or the |
| like. The pattern or the insn should be a simple store relative to |
| the CFA. */ |
| REG_NOTE (CFA_OFFSET) |
| |
| /* Similar to FRAME_RELATED_EXPR, with the additional information that this |
| is a save to a register, i.e. will result in DW_CFA_register. The insn |
| or the pattern should be simple reg-reg move. */ |
| REG_NOTE (CFA_REGISTER) |
| |
| /* Attached to insns that are RTX_FRAME_RELATED_P, with the information |
| that this is a restore operation, i.e. will result in DW_CFA_restore |
| or the like. Either the attached rtx, or the destination of the insn's |
| first pattern is the register to be restored. */ |
| REG_NOTE (CFA_RESTORE) |
| |
| /* Attached to insn that is RTX_FRAME_RELATED_P, marks insn that sets |
| vDRAP from DRAP. If vDRAP is a register, vdrap_reg is initalized |
| to the argument, if it is a MEM, it is ignored. */ |
| REG_NOTE (CFA_SET_VDRAP) |
| |
| /* Indicates that REG holds the exception context for the function. |
| This context is shared by inline functions, so the code to acquire |
| the real exception context is delayed until after inlining. */ |
| REG_NOTE (EH_CONTEXT) |
| |
| /* Indicates what exception region an INSN belongs in. This is used |
| to indicate what region to which a call may throw. REGION 0 |
| indicates that a call cannot throw at all. REGION -1 indicates |
| that it cannot throw, nor will it execute a non-local goto. */ |
| REG_NOTE (EH_REGION) |
| |
| /* Used by haifa-sched to save NOTE_INSN notes across scheduling. */ |
| REG_NOTE (SAVE_NOTE) |
| |
| /* Indicates that a call does not return. */ |
| REG_NOTE (NORETURN) |
| |
| /* Indicates that an indirect jump is a non-local goto instead of a |
| computed goto. */ |
| REG_NOTE (NON_LOCAL_GOTO) |
| |
| /* Indicates that a jump crosses between hot and cold sections in a |
| (partitioned) assembly or .o file, and therefore should not be |
| reduced to a simpler jump by optimizations. */ |
| REG_NOTE (CROSSING_JUMP) |
| |
| /* This kind of note is generated at each to `setjmp', and similar |
| functions that can return twice. */ |
| REG_NOTE (SETJMP) |
