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Module `dmd.backend.cod3`

Code generation 3

Includes

- generating a function prolog (pushing return address, loading paramters) - generating a function epilog (restoring registers, returning) - generation / peephole optimizations of jump / branch instructions

Compiler implementation of the D programming language.

Documentation

https://dlang.org/phobos/dmd_backend_cod3.html

Coverage

https://codecov.io/gh/dlang/dmd/src/master/src/dmd/backend/cod3.d

Functions

Name	Description
`allocretregs(ty, t, tyf, reg1, reg2)`	Allocate registers for function return values.
`assignaddr(bl)`	Take symbol info in union ev and replace it with a real address in Vpointer.
`branch(bl, flag)`	Replace JMPs in Bgotocode with JMP SHORTs whereever possible. This routine depends on FLcode jumps to only be forward referenced. BFLjmpoptdone is set to true if nothing more can be done with this block.
`calcblksize(c)`	Calculate bl.Bsize.
`calccodsize(c)`	Calculate and return code size of a code. Note that NOPs are sometimes used as markers, but are never output. LINNUMs are never output.
`cdframeptr(cdb, e, pretregs)`	Gen code for OPframeptr
`cdgot(cdb, e, pretregs)`	Gen code for load of GLOBAL_OFFSET_TABLE_. This value gets cached in the local variable 'localgot'.
`CF_print(cf)`	Pretty-print a CF mask.
`cgreg_dst_regs(dst_integer_reg, dst_float_reg)`	setup register allocator parameters with platform specific data
`cod3_adjSymOffsets()`	Adjust all Soffset's of stack variables so they are all relative to the frame pointer.
`cod3_align(seg)`	Align start of function.
`cod3_align_bytes(seg, nbytes)`	Word or dword align start of function.
`cod3_bpoffset(s)`	Return offset from BP of symbol s.
`cod3_EA(c)`	Determine if there is a modregrm byte for code.
`cod3_initregs()`	setup ALLREGS and BYTEREGS called by: codgen
`cod3_ptrchk(cdb, pcs, keepmsk)`	Append code to cdb which validates pointer described by addressing mode in pcs. Modify addressing mode in pcs.
`cod3_set32()`	Fix global variables for 386.
`cod3_set64()`	Fix global variables for I64.
`cod3_setdefault()`	set initial global variable values
`cod3_spoff()`	Return offset of SP from BP.
`cod3_stackadj(cdb, nbytes)`	Generate code to adjust the stack pointer by `nbytes`
`cod3_stackalign(cdb, nbytes)`	Generate code to align the stack pointer at `nbytes`
`cod3_thunk(sthunk, sfunc, p, thisty, d, i, d2)`	Generate code for, and output a thunk.
`cod3_useBP()`	Determine if BP can be used as a general purpose register. Note parallels between this routine and prolog().
`codout(seg, c, disasmBuf)`	Convert instructions to object code and write them to objmod.
`cse_simple(c, e)`	Generate code segment to be used later to restore a cse
`doswitch(cdb, b)`	Generate code for blocks ending in a switch statement. Take BCswitch and decide on BCifthen use if - then code BCjmptab index into jump table BCswitch search table for match
`epilog(b)`	Generate and return function epilog.
`gen_storecse(cdb, tym, reg, slot)`	Store `reg` to the common subexpression save area in index `slot`.
`genjmp(cdb, op, fltarg, targ)`	Generate a jump instruction.
`genmovreg(to, from)`	Generate a MOV to,from register instruction. Smart enough to dump redundant register moves, and segment register moves.
`genmulimm(cdb, r1, r2, imm)`	Generate immediate multiply instruction for r1=r2*imm. Optimize it into LEA's if we can.
`genshift(cdb)`	Load CX with the value of AHSHIFT.
`jmpaddr(c)`	Compute jump addresses for FLcode.
`jmpopcode(e)`	Return a jump opcode relevant to the elem for a JMP true.
`load_localgot(cdb)`	Load contents of localgot into EBX.
`makeitextern(s)`	Assume symbol s is extern.
`movregconst(cdb, reg, value, flags)`	Move constant value into reg. Take advantage of existing values in registers. If flags & mPSW set flags based on result Else if flags & 8 do not disturb flags Else don't care about flags If flags & 1 then byte move If flags & 2 then short move (for I32 and I64) If flags & 4 then don't disturb unused portion of register If flags & 16 then reg is a byte register AL..BH If flags & 64 (0x40) then 64 bit move (I64 only)
`obj_namestring(p, name)`
`outblkexitcode(cdb, bl, anyspill, sflsave, retsym, mfuncregsave)`	Generate block exit code
`outjmptab(b)`	Output data block for a jump table (BCjmptab). The 'holes' in the table get filled with the default label.
`outswitab(b)`	Output data block for a switch table. Two consecutive tables, the first is the case value table, the second is the address table.
`pinholeopt(c, b)`	Find shorter versions of the same instructions. Does these optimizations: replaces jmps to the next instruction with NOPs sign extension of modregrm displacement sign extension of immediate data (can't do it for OR, AND, XOR as the opcodes are not defined) short versions for AX EA short versions for reg EA Code is neither removed nor added.
`prolog_frame(cdb, farfunc, xlocalsize, enter, cfa_offset)`	Set up frame register.
`prolog_genvarargs(cdb, sv, namedargs)`	Generate special varargs prolog for Posix 64 bit systems.
`prolog_ifunc(cdb, tyf)`	Generate first part of prolog for interrupt function.
`prolog_loadparams(cdb, tyf, pushalloc, namedargs)`
`prolog_saveregs(cdb, topush, cfa_offset)`	Save registers that the function destroys, but that the ABI says should be preserved across function calls.
`prolog_stackalign(cdb)`	Enforce stack alignment.
`regmask(tym, tyf)`	Given a type, return a mask of registers to hold that type.
`REGSAVE_restore(regsave, cdb, reg, idx)`	Restore `reg` from `regsave` area. Complement REGSAVE_save().
`REGSAVE_save(regsave, cdb, reg, idx)`	Generate code to save `reg` in `regsave` stack area.
`vex_inssize(c)`	Size for vex encoded instruction.
`WRcodlst(c)`	Debug code to dump code structure.

Aliases

Name	Type	Description
`_compare_fp_t`	`nothrow @safe extern(C) int function(const(void), const(void))`	Struct necessary for sorting switch cases.

Authors

Walter Bright

License

Boost License 1.0