contrib/llvm/lib/Target/WebAssembly/WebAssemblyRuntimeLibcallSignatures.cpp

   1 // CodeGen/RuntimeLibcallSignatures.cpp - R.T. Lib. Call Signatures -*- C++ -*--
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 ///
  10 /// \file
  11 /// This file contains signature information for runtime libcalls.
  12 ///
  13 /// CodeGen uses external symbols, which it refers to by name. The WebAssembly
  14 /// target needs type information for all functions. This file contains a big
  15 /// table providing type signatures for all runtime library functions that LLVM
  16 /// uses.
  17 ///
  18 /// This is currently a fairly heavy-handed solution.
  19 ///
  20 //===----------------------------------------------------------------------===//
  21
  22 #include "WebAssemblyRuntimeLibcallSignatures.h"
  23 #include "WebAssemblySubtarget.h"
  24 #include "llvm/CodeGen/RuntimeLibcalls.h"
  25 #include "llvm/Support/ManagedStatic.h"
  26
  27 using namespace llvm;
  28
  29 namespace {
  30
  31 enum RuntimeLibcallSignature {
  32   func,
  33   f32_func_f32,
  34   f32_func_f64,
  35   f32_func_i32,
  36   f32_func_i64,
  37   f32_func_i16,
  38   f64_func_f32,
  39   f64_func_f64,
  40   f64_func_i32,
  41   f64_func_i64,
  42   i32_func_f32,
  43   i32_func_f64,
  44   i32_func_i32,
  45   i64_func_f32,
  46   i64_func_f64,
  47   i64_func_i64,
  48   f32_func_f32_f32,
  49   f32_func_f32_i32,
  50   f32_func_i64_i64,
  51   f64_func_f64_f64,
  52   f64_func_f64_i32,
  53   f64_func_i64_i64,
  54   i16_func_f32,
  55   i8_func_i8_i8,
  56   func_f32_iPTR_iPTR,
  57   func_f64_iPTR_iPTR,
  58   i16_func_i16_i16,
  59   i32_func_f32_f32,
  60   i32_func_f64_f64,
  61   i32_func_i32_i32,
  62   i32_func_i32_i32_iPTR,
  63   i64_func_i64_i64,
  64   i64_func_i64_i64_iPTR,
  65   i64_i64_func_f32,
  66   i64_i64_func_f64,
  67   i16_i16_func_i16_i16,
  68   i32_i32_func_i32_i32,
  69   i64_i64_func_i64_i64,
  70   i64_i64_func_i64_i64_i64_i64,
  71   i64_i64_func_i64_i64_i64_i64_iPTR,
  72   i64_i64_i64_i64_func_i64_i64_i64_i64,
  73   i64_i64_func_i64_i64_i32,
  74   iPTR_func_iPTR_i32_iPTR,
  75   iPTR_func_iPTR_iPTR_iPTR,
  76   f32_func_f32_f32_f32,
  77   f64_func_f64_f64_f64,
  78   func_i64_i64_iPTR_iPTR,
  79   func_iPTR_f32,
  80   func_iPTR_f64,
  81   func_iPTR_i32,
  82   func_iPTR_i64,
  83   func_iPTR_i64_i64,
  84   func_iPTR_i64_i64_i64_i64,
  85   func_iPTR_i64_i64_i64_i64_i64_i64,
  86   i32_func_i64_i64,
  87   i32_func_i64_i64_i64_i64,
  88   unsupported
  89 };
  90
  91 struct RuntimeLibcallSignatureTable {
  92   std::vector<RuntimeLibcallSignature> Table;
  93
  94   // Any newly-added libcalls will be unsupported by default.
  95   RuntimeLibcallSignatureTable() : Table(RTLIB::UNKNOWN_LIBCALL, unsupported) {
  96     // Integer
  97     Table[RTLIB::SHL_I16] = i16_func_i16_i16;
  98     Table[RTLIB::SHL_I32] = i32_func_i32_i32;
  99     Table[RTLIB::SHL_I64] = i64_func_i64_i64;
 100     Table[RTLIB::SHL_I128] = i64_i64_func_i64_i64_i32;
 101     Table[RTLIB::SRL_I16] = i16_func_i16_i16;
 102     Table[RTLIB::SRL_I32] = i32_func_i32_i32;
 103     Table[RTLIB::SRL_I64] = i64_func_i64_i64;
 104     Table[RTLIB::SRL_I128] = i64_i64_func_i64_i64_i32;
 105     Table[RTLIB::SRA_I16] = i16_func_i16_i16;
 106     Table[RTLIB::SRA_I32] = i32_func_i32_i32;
 107     Table[RTLIB::SRA_I64] = i64_func_i64_i64;
 108     Table[RTLIB::SRA_I128] = i64_i64_func_i64_i64_i32;
 109     Table[RTLIB::MUL_I8] = i8_func_i8_i8;
 110     Table[RTLIB::MUL_I16] = i16_func_i16_i16;
 111     Table[RTLIB::MUL_I32] = i32_func_i32_i32;
 112     Table[RTLIB::MUL_I64] = i64_func_i64_i64;
 113     Table[RTLIB::MUL_I128] = i64_i64_func_i64_i64_i64_i64;
 114     Table[RTLIB::MULO_I32] = i32_func_i32_i32_iPTR;
 115     Table[RTLIB::MULO_I64] = i64_func_i64_i64_iPTR;
 116     Table[RTLIB::MULO_I128] = i64_i64_func_i64_i64_i64_i64_iPTR;
 117     Table[RTLIB::SDIV_I8] = i8_func_i8_i8;
 118     Table[RTLIB::SDIV_I16] = i16_func_i16_i16;
 119     Table[RTLIB::SDIV_I32] = i32_func_i32_i32;
 120     Table[RTLIB::SDIV_I64] = i64_func_i64_i64;
 121     Table[RTLIB::SDIV_I128] = i64_i64_func_i64_i64_i64_i64;
 122     Table[RTLIB::UDIV_I8] = i8_func_i8_i8;
 123     Table[RTLIB::UDIV_I16] = i16_func_i16_i16;
 124     Table[RTLIB::UDIV_I32] = i32_func_i32_i32;
 125     Table[RTLIB::UDIV_I64] = i64_func_i64_i64;
 126     Table[RTLIB::UDIV_I128] = i64_i64_func_i64_i64_i64_i64;
 127     Table[RTLIB::SREM_I8] = i8_func_i8_i8;
 128     Table[RTLIB::SREM_I16] = i16_func_i16_i16;
 129     Table[RTLIB::SREM_I32] = i32_func_i32_i32;
 130     Table[RTLIB::SREM_I64] = i64_func_i64_i64;
 131     Table[RTLIB::SREM_I128] = i64_i64_func_i64_i64_i64_i64;
 132     Table[RTLIB::UREM_I8] = i8_func_i8_i8;
 133     Table[RTLIB::UREM_I16] = i16_func_i16_i16;
 134     Table[RTLIB::UREM_I32] = i32_func_i32_i32;
 135     Table[RTLIB::UREM_I64] = i64_func_i64_i64;
 136     Table[RTLIB::UREM_I128] = i64_i64_func_i64_i64_i64_i64;
 137     Table[RTLIB::SDIVREM_I8] = i8_func_i8_i8;
 138     Table[RTLIB::SDIVREM_I16] = i16_i16_func_i16_i16;
 139     Table[RTLIB::SDIVREM_I32] = i32_i32_func_i32_i32;
 140     Table[RTLIB::SDIVREM_I64] = i64_func_i64_i64;
 141     Table[RTLIB::SDIVREM_I128] = i64_i64_i64_i64_func_i64_i64_i64_i64;
 142     Table[RTLIB::UDIVREM_I8] = i8_func_i8_i8;
 143     Table[RTLIB::UDIVREM_I16] = i16_i16_func_i16_i16;
 144     Table[RTLIB::UDIVREM_I32] = i32_i32_func_i32_i32;
 145     Table[RTLIB::UDIVREM_I64] = i64_i64_func_i64_i64;
 146     Table[RTLIB::UDIVREM_I128] = i64_i64_i64_i64_func_i64_i64_i64_i64;
 147     Table[RTLIB::NEG_I32] = i32_func_i32;
 148     Table[RTLIB::NEG_I64] = i64_func_i64;
 149
 150     // Floating-point.
 151     // All F80 and PPCF128 routines are unsupported.
 152     Table[RTLIB::ADD_F32] = f32_func_f32_f32;
 153     Table[RTLIB::ADD_F64] = f64_func_f64_f64;
 154     Table[RTLIB::ADD_F128] = func_iPTR_i64_i64_i64_i64;
 155     Table[RTLIB::SUB_F32] = f32_func_f32_f32;
 156     Table[RTLIB::SUB_F64] = f64_func_f64_f64;
 157     Table[RTLIB::SUB_F128] = func_iPTR_i64_i64_i64_i64;
 158     Table[RTLIB::MUL_F32] = f32_func_f32_f32;
 159     Table[RTLIB::MUL_F64] = f64_func_f64_f64;
 160     Table[RTLIB::MUL_F128] = func_iPTR_i64_i64_i64_i64;
 161     Table[RTLIB::DIV_F32] = f32_func_f32_f32;
 162     Table[RTLIB::DIV_F64] = f64_func_f64_f64;
 163     Table[RTLIB::DIV_F128] = func_iPTR_i64_i64_i64_i64;
 164     Table[RTLIB::REM_F32] = f32_func_f32_f32;
 165     Table[RTLIB::REM_F64] = f64_func_f64_f64;
 166     Table[RTLIB::REM_F128] = func_iPTR_i64_i64_i64_i64;
 167     Table[RTLIB::FMA_F32] = f32_func_f32_f32_f32;
 168     Table[RTLIB::FMA_F64] = f64_func_f64_f64_f64;
 169     Table[RTLIB::FMA_F128] = func_iPTR_i64_i64_i64_i64_i64_i64;
 170     Table[RTLIB::POWI_F32] = f32_func_f32_i32;
 171     Table[RTLIB::POWI_F64] = f64_func_f64_i32;
 172     Table[RTLIB::POWI_F128] = func_iPTR_i64_i64_i64_i64;
 173     Table[RTLIB::SQRT_F32] = f32_func_f32;
 174     Table[RTLIB::SQRT_F64] = f64_func_f64;
 175     Table[RTLIB::SQRT_F128] = func_iPTR_i64_i64;
 176     Table[RTLIB::LOG_F32] = f32_func_f32;
 177     Table[RTLIB::LOG_F64] = f64_func_f64;
 178     Table[RTLIB::LOG_F128] = func_iPTR_i64_i64;
 179     Table[RTLIB::LOG2_F32] = f32_func_f32;
 180     Table[RTLIB::LOG2_F64] = f64_func_f64;
 181     Table[RTLIB::LOG2_F128] = func_iPTR_i64_i64;
 182     Table[RTLIB::LOG10_F32] = f32_func_f32;
 183     Table[RTLIB::LOG10_F64] = f64_func_f64;
 184     Table[RTLIB::LOG10_F128] = func_iPTR_i64_i64;
 185     Table[RTLIB::EXP_F32] = f32_func_f32;
 186     Table[RTLIB::EXP_F64] = f64_func_f64;
 187     Table[RTLIB::EXP_F128] = func_iPTR_i64_i64;
 188     Table[RTLIB::EXP2_F32] = f32_func_f32;
 189     Table[RTLIB::EXP2_F64] = f64_func_f64;
 190     Table[RTLIB::EXP2_F128] = func_iPTR_i64_i64;
 191     Table[RTLIB::SIN_F32] = f32_func_f32;
 192     Table[RTLIB::SIN_F64] = f64_func_f64;
 193     Table[RTLIB::SIN_F128] = func_iPTR_i64_i64;
 194     Table[RTLIB::COS_F32] = f32_func_f32;
 195     Table[RTLIB::COS_F64] = f64_func_f64;
 196     Table[RTLIB::COS_F128] = func_iPTR_i64_i64;
 197     Table[RTLIB::SINCOS_F32] = func_f32_iPTR_iPTR;
 198     Table[RTLIB::SINCOS_F64] = func_f64_iPTR_iPTR;
 199     Table[RTLIB::SINCOS_F128] = func_i64_i64_iPTR_iPTR;
 200     Table[RTLIB::POW_F32] = f32_func_f32_f32;
 201     Table[RTLIB::POW_F64] = f64_func_f64_f64;
 202     Table[RTLIB::POW_F128] = func_iPTR_i64_i64_i64_i64;
 203     Table[RTLIB::CEIL_F32] = f32_func_f32;
 204     Table[RTLIB::CEIL_F64] = f64_func_f64;
 205     Table[RTLIB::CEIL_F128] = func_iPTR_i64_i64;
 206     Table[RTLIB::TRUNC_F32] = f32_func_f32;
 207     Table[RTLIB::TRUNC_F64] = f64_func_f64;
 208     Table[RTLIB::TRUNC_F128] = func_iPTR_i64_i64;
 209     Table[RTLIB::RINT_F32] = f32_func_f32;
 210     Table[RTLIB::RINT_F64] = f64_func_f64;
 211     Table[RTLIB::RINT_F128] = func_iPTR_i64_i64;
 212     Table[RTLIB::NEARBYINT_F32] = f32_func_f32;
 213     Table[RTLIB::NEARBYINT_F64] = f64_func_f64;
 214     Table[RTLIB::NEARBYINT_F128] = func_iPTR_i64_i64;
 215     Table[RTLIB::ROUND_F32] = f32_func_f32;
 216     Table[RTLIB::ROUND_F64] = f64_func_f64;
 217     Table[RTLIB::ROUND_F128] = func_iPTR_i64_i64;
 218     Table[RTLIB::FLOOR_F32] = f32_func_f32;
 219     Table[RTLIB::FLOOR_F64] = f64_func_f64;
 220     Table[RTLIB::FLOOR_F128] = func_iPTR_i64_i64;
 221     Table[RTLIB::COPYSIGN_F32] = f32_func_f32_f32;
 222     Table[RTLIB::COPYSIGN_F64] = f64_func_f64_f64;
 223     Table[RTLIB::COPYSIGN_F128] = func_iPTR_i64_i64_i64_i64;
 224     Table[RTLIB::FMIN_F32] = f32_func_f32_f32;
 225     Table[RTLIB::FMIN_F64] = f64_func_f64_f64;
 226     Table[RTLIB::FMIN_F128] = func_iPTR_i64_i64_i64_i64;
 227     Table[RTLIB::FMAX_F32] = f32_func_f32_f32;
 228     Table[RTLIB::FMAX_F64] = f64_func_f64_f64;
 229     Table[RTLIB::FMAX_F128] = func_iPTR_i64_i64_i64_i64;
 230
 231     // Conversion
 232     // All F80 and PPCF128 routines are unspported.
 233     Table[RTLIB::FPEXT_F64_F128] = func_iPTR_f64;
 234     Table[RTLIB::FPEXT_F32_F128] = func_iPTR_f32;
 235     Table[RTLIB::FPEXT_F32_F64] = f64_func_f32;
 236     Table[RTLIB::FPEXT_F16_F32] = f32_func_i16;
 237     Table[RTLIB::FPROUND_F32_F16] = i16_func_f32;
 238     Table[RTLIB::FPROUND_F64_F32] = f32_func_f64;
 239     Table[RTLIB::FPROUND_F128_F32] = f32_func_i64_i64;
 240     Table[RTLIB::FPROUND_F128_F64] = f64_func_i64_i64;
 241     Table[RTLIB::FPTOSINT_F32_I32] = i32_func_f32;
 242     Table[RTLIB::FPTOSINT_F32_I64] = i64_func_f32;
 243     Table[RTLIB::FPTOSINT_F32_I128] = i64_i64_func_f32;
 244     Table[RTLIB::FPTOSINT_F64_I32] = i32_func_f64;
 245     Table[RTLIB::FPTOSINT_F64_I64] = i64_func_f64;
 246     Table[RTLIB::FPTOSINT_F64_I128] = i64_i64_func_f64;
 247     Table[RTLIB::FPTOSINT_F128_I32] = i32_func_i64_i64;
 248     Table[RTLIB::FPTOSINT_F128_I64] = i64_func_i64_i64;
 249     Table[RTLIB::FPTOSINT_F128_I128] = i64_i64_func_i64_i64;
 250     Table[RTLIB::FPTOUINT_F32_I32] = i32_func_f32;
 251     Table[RTLIB::FPTOUINT_F32_I64] = i64_func_f32;
 252     Table[RTLIB::FPTOUINT_F32_I128] = i64_i64_func_f32;
 253     Table[RTLIB::FPTOUINT_F64_I32] = i32_func_f64;
 254     Table[RTLIB::FPTOUINT_F64_I64] = i64_func_f64;
 255     Table[RTLIB::FPTOUINT_F64_I128] = i64_i64_func_f64;
 256     Table[RTLIB::FPTOUINT_F128_I32] = i32_func_i64_i64;
 257     Table[RTLIB::FPTOUINT_F128_I64] = i64_func_i64_i64;
 258     Table[RTLIB::FPTOUINT_F128_I128] = i64_i64_func_i64_i64;
 259     Table[RTLIB::SINTTOFP_I32_F32] = f32_func_i32;
 260     Table[RTLIB::SINTTOFP_I32_F64] = f64_func_i32;
 261     Table[RTLIB::SINTTOFP_I32_F128] = func_iPTR_i32;
 262     Table[RTLIB::SINTTOFP_I64_F32] = f32_func_i64;
 263     Table[RTLIB::SINTTOFP_I64_F64] = f64_func_i64;
 264     Table[RTLIB::SINTTOFP_I64_F128] = func_iPTR_i64;
 265     Table[RTLIB::SINTTOFP_I128_F32] = f32_func_i64_i64;
 266     Table[RTLIB::SINTTOFP_I128_F64] = f64_func_i64_i64;
 267     Table[RTLIB::SINTTOFP_I128_F128] = func_iPTR_i64_i64;
 268     Table[RTLIB::UINTTOFP_I32_F32] = f32_func_i32;
 269     Table[RTLIB::UINTTOFP_I32_F64] = f64_func_i64;
 270     Table[RTLIB::UINTTOFP_I32_F128] = func_iPTR_i32;
 271     Table[RTLIB::UINTTOFP_I64_F32] = f32_func_i64;
 272     Table[RTLIB::UINTTOFP_I64_F64] = f64_func_i64;
 273     Table[RTLIB::UINTTOFP_I64_F128] = func_iPTR_i64;
 274     Table[RTLIB::UINTTOFP_I128_F32] = f32_func_i64_i64;
 275     Table[RTLIB::UINTTOFP_I128_F64] = f64_func_i64_i64;
 276     Table[RTLIB::UINTTOFP_I128_F128] = func_iPTR_i64_i64;
 277
 278     // Comparison
 279     // ALl F80 and PPCF128 routines are unsupported.
 280     Table[RTLIB::OEQ_F32] = i32_func_f32_f32;
 281     Table[RTLIB::OEQ_F64] = i32_func_f64_f64;
 282     Table[RTLIB::OEQ_F128] = i32_func_i64_i64_i64_i64;
 283     Table[RTLIB::UNE_F32] = i32_func_f32_f32;
 284     Table[RTLIB::UNE_F64] = i32_func_f64_f64;
 285     Table[RTLIB::UNE_F128] = i32_func_i64_i64_i64_i64;
 286     Table[RTLIB::OGE_F32] = i32_func_f32_f32;
 287     Table[RTLIB::OGE_F64] = i32_func_f64_f64;
 288     Table[RTLIB::OGE_F128] = i32_func_i64_i64_i64_i64;
 289     Table[RTLIB::OLT_F32] = i32_func_f32_f32;
 290     Table[RTLIB::OLT_F64] = i32_func_f64_f64;
 291     Table[RTLIB::OLT_F128] = i32_func_i64_i64_i64_i64;
 292     Table[RTLIB::OLE_F32] = i32_func_f32_f32;
 293     Table[RTLIB::OLE_F64] = i32_func_f64_f64;
 294     Table[RTLIB::OLE_F128] = i32_func_i64_i64_i64_i64;
 295     Table[RTLIB::OGT_F32] = i32_func_f32_f32;
 296     Table[RTLIB::OGT_F64] = i32_func_f64_f64;
 297     Table[RTLIB::OGT_F128] = i32_func_i64_i64_i64_i64;
 298     Table[RTLIB::UO_F32] = i32_func_f32_f32;
 299     Table[RTLIB::UO_F64] = i32_func_f64_f64;
 300     Table[RTLIB::UO_F128] = i32_func_i64_i64_i64_i64;
 301     // O_FXX has the weird property that it uses the same libcall name as UO_FXX
 302     // This breaks our name-based lookup. Fortunately only the UO family of
 303     // libcalls appears to be actually used.
 304     Table[RTLIB::O_F32] = unsupported;
 305     Table[RTLIB::O_F64] = unsupported;
 306     Table[RTLIB::O_F128] = unsupported;
 307
 308     // Memory
 309     Table[RTLIB::MEMCPY] = iPTR_func_iPTR_iPTR_iPTR;
 310     Table[RTLIB::MEMSET] = iPTR_func_iPTR_i32_iPTR;
 311     Table[RTLIB::MEMMOVE] = iPTR_func_iPTR_iPTR_iPTR;
 312
 313     // Element-wise Atomic memory
 314     // TODO: Fix these when we implement atomic support
 315     Table[RTLIB::MEMCPY_ELEMENT_UNORDERED_ATOMIC_1] = unsupported;
 316     Table[RTLIB::MEMCPY_ELEMENT_UNORDERED_ATOMIC_2] = unsupported;
 317     Table[RTLIB::MEMCPY_ELEMENT_UNORDERED_ATOMIC_4] = unsupported;
 318     Table[RTLIB::MEMCPY_ELEMENT_UNORDERED_ATOMIC_8] = unsupported;
 319     Table[RTLIB::MEMCPY_ELEMENT_UNORDERED_ATOMIC_16] = unsupported;
 320     Table[RTLIB::MEMMOVE_ELEMENT_UNORDERED_ATOMIC_1] = unsupported;
 321     Table[RTLIB::MEMMOVE_ELEMENT_UNORDERED_ATOMIC_2] = unsupported;
 322     Table[RTLIB::MEMMOVE_ELEMENT_UNORDERED_ATOMIC_4] = unsupported;
 323     Table[RTLIB::MEMMOVE_ELEMENT_UNORDERED_ATOMIC_8] = unsupported;
 324     Table[RTLIB::MEMMOVE_ELEMENT_UNORDERED_ATOMIC_16] = unsupported;
 325
 326     Table[RTLIB::MEMSET_ELEMENT_UNORDERED_ATOMIC_1] = unsupported;
 327     Table[RTLIB::MEMSET_ELEMENT_UNORDERED_ATOMIC_2] = unsupported;
 328     Table[RTLIB::MEMSET_ELEMENT_UNORDERED_ATOMIC_4] = unsupported;
 329     Table[RTLIB::MEMSET_ELEMENT_UNORDERED_ATOMIC_8] = unsupported;
 330     Table[RTLIB::MEMSET_ELEMENT_UNORDERED_ATOMIC_16] = unsupported;
 331
 332     // Atomic '__sync_*' libcalls.
 333     // TODO: Fix these when we implement atomic support
 334     Table[RTLIB::SYNC_VAL_COMPARE_AND_SWAP_1] = unsupported;
 335     Table[RTLIB::SYNC_VAL_COMPARE_AND_SWAP_2] = unsupported;
 336     Table[RTLIB::SYNC_VAL_COMPARE_AND_SWAP_4] = unsupported;
 337     Table[RTLIB::SYNC_VAL_COMPARE_AND_SWAP_8] = unsupported;
 338     Table[RTLIB::SYNC_VAL_COMPARE_AND_SWAP_16] = unsupported;
 339     Table[RTLIB::SYNC_LOCK_TEST_AND_SET_1] = unsupported;
 340     Table[RTLIB::SYNC_LOCK_TEST_AND_SET_2] = unsupported;
 341     Table[RTLIB::SYNC_LOCK_TEST_AND_SET_4] = unsupported;
 342     Table[RTLIB::SYNC_LOCK_TEST_AND_SET_8] = unsupported;
 343     Table[RTLIB::SYNC_LOCK_TEST_AND_SET_16] = unsupported;
 344     Table[RTLIB::SYNC_FETCH_AND_ADD_1] = unsupported;
 345     Table[RTLIB::SYNC_FETCH_AND_ADD_2] = unsupported;
 346     Table[RTLIB::SYNC_FETCH_AND_ADD_4] = unsupported;
 347     Table[RTLIB::SYNC_FETCH_AND_ADD_8] = unsupported;
 348     Table[RTLIB::SYNC_FETCH_AND_ADD_16] = unsupported;
 349     Table[RTLIB::SYNC_FETCH_AND_SUB_1] = unsupported;
 350     Table[RTLIB::SYNC_FETCH_AND_SUB_2] = unsupported;
 351     Table[RTLIB::SYNC_FETCH_AND_SUB_4] = unsupported;
 352     Table[RTLIB::SYNC_FETCH_AND_SUB_8] = unsupported;
 353     Table[RTLIB::SYNC_FETCH_AND_SUB_16] = unsupported;
 354     Table[RTLIB::SYNC_FETCH_AND_AND_1] = unsupported;
 355     Table[RTLIB::SYNC_FETCH_AND_AND_2] = unsupported;
 356     Table[RTLIB::SYNC_FETCH_AND_AND_4] = unsupported;
 357     Table[RTLIB::SYNC_FETCH_AND_AND_8] = unsupported;
 358     Table[RTLIB::SYNC_FETCH_AND_AND_16] = unsupported;
 359     Table[RTLIB::SYNC_FETCH_AND_OR_1] = unsupported;
 360     Table[RTLIB::SYNC_FETCH_AND_OR_2] = unsupported;
 361     Table[RTLIB::SYNC_FETCH_AND_OR_4] = unsupported;
 362     Table[RTLIB::SYNC_FETCH_AND_OR_8] = unsupported;
 363     Table[RTLIB::SYNC_FETCH_AND_OR_16] = unsupported;
 364     Table[RTLIB::SYNC_FETCH_AND_XOR_1] = unsupported;
 365     Table[RTLIB::SYNC_FETCH_AND_XOR_2] = unsupported;
 366     Table[RTLIB::SYNC_FETCH_AND_XOR_4] = unsupported;
 367     Table[RTLIB::SYNC_FETCH_AND_XOR_8] = unsupported;
 368     Table[RTLIB::SYNC_FETCH_AND_XOR_16] = unsupported;
 369     Table[RTLIB::SYNC_FETCH_AND_NAND_1] = unsupported;
 370     Table[RTLIB::SYNC_FETCH_AND_NAND_2] = unsupported;
 371     Table[RTLIB::SYNC_FETCH_AND_NAND_4] = unsupported;
 372     Table[RTLIB::SYNC_FETCH_AND_NAND_8] = unsupported;
 373     Table[RTLIB::SYNC_FETCH_AND_NAND_16] = unsupported;
 374     Table[RTLIB::SYNC_FETCH_AND_MAX_1] = unsupported;
 375     Table[RTLIB::SYNC_FETCH_AND_MAX_2] = unsupported;
 376     Table[RTLIB::SYNC_FETCH_AND_MAX_4] = unsupported;
 377     Table[RTLIB::SYNC_FETCH_AND_MAX_8] = unsupported;
 378     Table[RTLIB::SYNC_FETCH_AND_MAX_16] = unsupported;
 379     Table[RTLIB::SYNC_FETCH_AND_UMAX_1] = unsupported;
 380     Table[RTLIB::SYNC_FETCH_AND_UMAX_2] = unsupported;
 381     Table[RTLIB::SYNC_FETCH_AND_UMAX_4] = unsupported;
 382     Table[RTLIB::SYNC_FETCH_AND_UMAX_8] = unsupported;
 383     Table[RTLIB::SYNC_FETCH_AND_UMAX_16] = unsupported;
 384     Table[RTLIB::SYNC_FETCH_AND_MIN_1] = unsupported;
 385     Table[RTLIB::SYNC_FETCH_AND_MIN_2] = unsupported;
 386     Table[RTLIB::SYNC_FETCH_AND_MIN_4] = unsupported;
 387     Table[RTLIB::SYNC_FETCH_AND_MIN_8] = unsupported;
 388     Table[RTLIB::SYNC_FETCH_AND_MIN_16] = unsupported;
 389     Table[RTLIB::SYNC_FETCH_AND_UMIN_1] = unsupported;
 390     Table[RTLIB::SYNC_FETCH_AND_UMIN_2] = unsupported;
 391     Table[RTLIB::SYNC_FETCH_AND_UMIN_4] = unsupported;
 392     Table[RTLIB::SYNC_FETCH_AND_UMIN_8] = unsupported;
 393     Table[RTLIB::SYNC_FETCH_AND_UMIN_16] = unsupported;
 394
 395     // Atomic '__atomic_*' libcalls.
 396     // TODO: Fix these when we implement atomic support
 397     Table[RTLIB::ATOMIC_LOAD] = unsupported;
 398     Table[RTLIB::ATOMIC_LOAD_1] = unsupported;
 399     Table[RTLIB::ATOMIC_LOAD_2] = unsupported;
 400     Table[RTLIB::ATOMIC_LOAD_4] = unsupported;
 401     Table[RTLIB::ATOMIC_LOAD_8] = unsupported;
 402     Table[RTLIB::ATOMIC_LOAD_16] = unsupported;
 403
 404     Table[RTLIB::ATOMIC_STORE] = unsupported;
 405     Table[RTLIB::ATOMIC_STORE_1] = unsupported;
 406     Table[RTLIB::ATOMIC_STORE_2] = unsupported;
 407     Table[RTLIB::ATOMIC_STORE_4] = unsupported;
 408     Table[RTLIB::ATOMIC_STORE_8] = unsupported;
 409     Table[RTLIB::ATOMIC_STORE_16] = unsupported;
 410
 411     Table[RTLIB::ATOMIC_EXCHANGE] = unsupported;
 412     Table[RTLIB::ATOMIC_EXCHANGE_1] = unsupported;
 413     Table[RTLIB::ATOMIC_EXCHANGE_2] = unsupported;
 414     Table[RTLIB::ATOMIC_EXCHANGE_4] = unsupported;
 415     Table[RTLIB::ATOMIC_EXCHANGE_8] = unsupported;
 416     Table[RTLIB::ATOMIC_EXCHANGE_16] = unsupported;
 417
 418     Table[RTLIB::ATOMIC_COMPARE_EXCHANGE] = unsupported;
 419     Table[RTLIB::ATOMIC_COMPARE_EXCHANGE_1] = unsupported;
 420     Table[RTLIB::ATOMIC_COMPARE_EXCHANGE_2] = unsupported;
 421     Table[RTLIB::ATOMIC_COMPARE_EXCHANGE_4] = unsupported;
 422     Table[RTLIB::ATOMIC_COMPARE_EXCHANGE_8] = unsupported;
 423     Table[RTLIB::ATOMIC_COMPARE_EXCHANGE_16] = unsupported;
 424
 425     Table[RTLIB::ATOMIC_FETCH_ADD_1] = unsupported;
 426     Table[RTLIB::ATOMIC_FETCH_ADD_2] = unsupported;
 427     Table[RTLIB::ATOMIC_FETCH_ADD_4] = unsupported;
 428     Table[RTLIB::ATOMIC_FETCH_ADD_8] = unsupported;
 429     Table[RTLIB::ATOMIC_FETCH_ADD_16] = unsupported;
 430
 431     Table[RTLIB::ATOMIC_FETCH_SUB_1] = unsupported;
 432     Table[RTLIB::ATOMIC_FETCH_SUB_2] = unsupported;
 433     Table[RTLIB::ATOMIC_FETCH_SUB_4] = unsupported;
 434     Table[RTLIB::ATOMIC_FETCH_SUB_8] = unsupported;
 435     Table[RTLIB::ATOMIC_FETCH_SUB_16] = unsupported;
 436
 437     Table[RTLIB::ATOMIC_FETCH_AND_1] = unsupported;
 438     Table[RTLIB::ATOMIC_FETCH_AND_2] = unsupported;
 439     Table[RTLIB::ATOMIC_FETCH_AND_4] = unsupported;
 440     Table[RTLIB::ATOMIC_FETCH_AND_8] = unsupported;
 441     Table[RTLIB::ATOMIC_FETCH_AND_16] = unsupported;
 442
 443     Table[RTLIB::ATOMIC_FETCH_OR_1] = unsupported;
 444     Table[RTLIB::ATOMIC_FETCH_OR_2] = unsupported;
 445     Table[RTLIB::ATOMIC_FETCH_OR_4] = unsupported;
 446     Table[RTLIB::ATOMIC_FETCH_OR_8] = unsupported;
 447     Table[RTLIB::ATOMIC_FETCH_OR_16] = unsupported;
 448
 449     Table[RTLIB::ATOMIC_FETCH_XOR_1] = unsupported;
 450     Table[RTLIB::ATOMIC_FETCH_XOR_2] = unsupported;
 451     Table[RTLIB::ATOMIC_FETCH_XOR_4] = unsupported;
 452     Table[RTLIB::ATOMIC_FETCH_XOR_8] = unsupported;
 453     Table[RTLIB::ATOMIC_FETCH_XOR_16] = unsupported;
 454
 455     Table[RTLIB::ATOMIC_FETCH_NAND_1] = unsupported;
 456     Table[RTLIB::ATOMIC_FETCH_NAND_2] = unsupported;
 457     Table[RTLIB::ATOMIC_FETCH_NAND_4] = unsupported;
 458     Table[RTLIB::ATOMIC_FETCH_NAND_8] = unsupported;
 459     Table[RTLIB::ATOMIC_FETCH_NAND_16] = unsupported;
 460   }
 461 };
 462
 463 ManagedStatic<RuntimeLibcallSignatureTable> RuntimeLibcallSignatures;
 464
 465 // Maps libcall names to their RTLIB::Libcall number. Builds the map in a
 466 // constructor for use with ManagedStatic
 467 struct StaticLibcallNameMap {
 468   StringMap<RTLIB::Libcall> Map;
 469   StaticLibcallNameMap() {
 470     static const std::pair<const char *, RTLIB::Libcall> NameLibcalls[] = {
 471 #define HANDLE_LIBCALL(code, name) {(const char *)name, RTLIB::code},
 472 #include "llvm/IR/RuntimeLibcalls.def"
 473 #undef HANDLE_LIBCALL
 474     };
 475     for (const auto &NameLibcall : NameLibcalls) {
 476       if (NameLibcall.first != nullptr &&
 477           RuntimeLibcallSignatures->Table[NameLibcall.second] != unsupported) {
 478         assert(Map.find(NameLibcall.first) == Map.end() &&
 479                "duplicate libcall names in name map");
 480         Map[NameLibcall.first] = NameLibcall.second;
 481       }
 482     }
 483   }
 484 };
 485
 486 } // end anonymous namespace
 487
 488 void llvm::GetLibcallSignature(const WebAssemblySubtarget &Subtarget,
 489                                RTLIB::Libcall LC,
 490                                SmallVectorImpl<wasm::ValType> &Rets,
 491                                SmallVectorImpl<wasm::ValType> &Params) {
 492   assert(Rets.empty());
 493   assert(Params.empty());
 494
 495   wasm::ValType iPTR =
 496       Subtarget.hasAddr64() ? wasm::ValType::I64 : wasm::ValType::I32;
 497
 498   auto &Table = RuntimeLibcallSignatures->Table;
 499   switch (Table[LC]) {
 500   case func:
 501     break;
 502   case f32_func_f32:
 503     Rets.push_back(wasm::ValType::F32);
 504     Params.push_back(wasm::ValType::F32);
 505     break;
 506   case f32_func_f64:
 507     Rets.push_back(wasm::ValType::F32);
 508     Params.push_back(wasm::ValType::F64);
 509     break;
 510   case f32_func_i32:
 511     Rets.push_back(wasm::ValType::F32);
 512     Params.push_back(wasm::ValType::I32);
 513     break;
 514   case f32_func_i64:
 515     Rets.push_back(wasm::ValType::F32);
 516     Params.push_back(wasm::ValType::I64);
 517     break;
 518   case f32_func_i16:
 519     Rets.push_back(wasm::ValType::F32);
 520     Params.push_back(wasm::ValType::I32);
 521     break;
 522   case f64_func_f32:
 523     Rets.push_back(wasm::ValType::F64);
 524     Params.push_back(wasm::ValType::F32);
 525     break;
 526   case f64_func_f64:
 527     Rets.push_back(wasm::ValType::F64);
 528     Params.push_back(wasm::ValType::F64);
 529     break;
 530   case f64_func_i32:
 531     Rets.push_back(wasm::ValType::F64);
 532     Params.push_back(wasm::ValType::I32);
 533     break;
 534   case f64_func_i64:
 535     Rets.push_back(wasm::ValType::F64);
 536     Params.push_back(wasm::ValType::I64);
 537     break;
 538   case i32_func_f32:
 539     Rets.push_back(wasm::ValType::I32);
 540     Params.push_back(wasm::ValType::F32);
 541     break;
 542   case i32_func_f64:
 543     Rets.push_back(wasm::ValType::I32);
 544     Params.push_back(wasm::ValType::F64);
 545     break;
 546   case i32_func_i32:
 547     Rets.push_back(wasm::ValType::I32);
 548     Params.push_back(wasm::ValType::I32);
 549     break;
 550   case i64_func_f32:
 551     Rets.push_back(wasm::ValType::I64);
 552     Params.push_back(wasm::ValType::F32);
 553     break;
 554   case i64_func_f64:
 555     Rets.push_back(wasm::ValType::I64);
 556     Params.push_back(wasm::ValType::F64);
 557     break;
 558   case i64_func_i64:
 559     Rets.push_back(wasm::ValType::I64);
 560     Params.push_back(wasm::ValType::I64);
 561     break;
 562   case f32_func_f32_f32:
 563     Rets.push_back(wasm::ValType::F32);
 564     Params.push_back(wasm::ValType::F32);
 565     Params.push_back(wasm::ValType::F32);
 566     break;
 567   case f32_func_f32_i32:
 568     Rets.push_back(wasm::ValType::F32);
 569     Params.push_back(wasm::ValType::F32);
 570     Params.push_back(wasm::ValType::I32);
 571     break;
 572   case f32_func_i64_i64:
 573     Rets.push_back(wasm::ValType::F32);
 574     Params.push_back(wasm::ValType::I64);
 575     Params.push_back(wasm::ValType::I64);
 576     break;
 577   case f64_func_f64_f64:
 578     Rets.push_back(wasm::ValType::F64);
 579     Params.push_back(wasm::ValType::F64);
 580     Params.push_back(wasm::ValType::F64);
 581     break;
 582   case f64_func_f64_i32:
 583     Rets.push_back(wasm::ValType::F64);
 584     Params.push_back(wasm::ValType::F64);
 585     Params.push_back(wasm::ValType::I32);
 586     break;
 587   case f64_func_i64_i64:
 588     Rets.push_back(wasm::ValType::F64);
 589     Params.push_back(wasm::ValType::I64);
 590     Params.push_back(wasm::ValType::I64);
 591     break;
 592   case i16_func_f32:
 593     Rets.push_back(wasm::ValType::I32);
 594     Params.push_back(wasm::ValType::F32);
 595     break;
 596   case i8_func_i8_i8:
 597     Rets.push_back(wasm::ValType::I32);
 598     Params.push_back(wasm::ValType::I32);
 599     Params.push_back(wasm::ValType::I32);
 600     break;
 601   case func_f32_iPTR_iPTR:
 602     Params.push_back(wasm::ValType::F32);
 603     Params.push_back(iPTR);
 604     Params.push_back(iPTR);
 605     break;
 606   case func_f64_iPTR_iPTR:
 607     Params.push_back(wasm::ValType::F64);
 608     Params.push_back(iPTR);
 609     Params.push_back(iPTR);
 610     break;
 611   case i16_func_i16_i16:
 612     Rets.push_back(wasm::ValType::I32);
 613     Params.push_back(wasm::ValType::I32);
 614     Params.push_back(wasm::ValType::I32);
 615     break;
 616   case i32_func_f32_f32:
 617     Rets.push_back(wasm::ValType::I32);
 618     Params.push_back(wasm::ValType::F32);
 619     Params.push_back(wasm::ValType::F32);
 620     break;
 621   case i32_func_f64_f64:
 622     Rets.push_back(wasm::ValType::I32);
 623     Params.push_back(wasm::ValType::F64);
 624     Params.push_back(wasm::ValType::F64);
 625     break;
 626   case i32_func_i32_i32:
 627     Rets.push_back(wasm::ValType::I32);
 628     Params.push_back(wasm::ValType::I32);
 629     Params.push_back(wasm::ValType::I32);
 630     break;
 631   case i32_func_i32_i32_iPTR:
 632     Rets.push_back(wasm::ValType::I32);
 633     Params.push_back(wasm::ValType::I32);
 634     Params.push_back(wasm::ValType::I32);
 635     Params.push_back(iPTR);
 636     break;
 637   case i64_func_i64_i64:
 638     Rets.push_back(wasm::ValType::I64);
 639     Params.push_back(wasm::ValType::I64);
 640     Params.push_back(wasm::ValType::I64);
 641     break;
 642   case i64_func_i64_i64_iPTR:
 643     Rets.push_back(wasm::ValType::I64);
 644     Params.push_back(wasm::ValType::I64);
 645     Params.push_back(wasm::ValType::I64);
 646     Params.push_back(iPTR);
 647     break;
 648   case i64_i64_func_f32:
 649 #if 0 // TODO: Enable this when wasm gets multiple-return-value support.
 650     Rets.push_back(wasm::ValType::I64);
 651     Rets.push_back(wasm::ValType::I64);
 652 #else
 653     Params.push_back(iPTR);
 654 #endif
 655     Params.push_back(wasm::ValType::F32);
 656     break;
 657   case i64_i64_func_f64:
 658 #if 0 // TODO: Enable this when wasm gets multiple-return-value support.
 659     Rets.push_back(wasm::ValType::I64);
 660     Rets.push_back(wasm::ValType::I64);
 661 #else
 662     Params.push_back(iPTR);
 663 #endif
 664     Params.push_back(wasm::ValType::F64);
 665     break;
 666   case i16_i16_func_i16_i16:
 667 #if 0 // TODO: Enable this when wasm gets multiple-return-value support.
 668     Rets.push_back(wasm::ValType::I32);
 669     Rets.push_back(wasm::ValType::I32);
 670 #else
 671     Params.push_back(iPTR);
 672 #endif
 673     Params.push_back(wasm::ValType::I32);
 674     Params.push_back(wasm::ValType::I32);
 675     break;
 676   case i32_i32_func_i32_i32:
 677 #if 0 // TODO: Enable this when wasm gets multiple-return-value support.
 678     Rets.push_back(wasm::ValType::I32);
 679     Rets.push_back(wasm::ValType::I32);
 680 #else
 681     Params.push_back(iPTR);
 682 #endif
 683     Params.push_back(wasm::ValType::I32);
 684     Params.push_back(wasm::ValType::I32);
 685     break;
 686   case i64_i64_func_i64_i64:
 687 #if 0 // TODO: Enable this when wasm gets multiple-return-value support.
 688     Rets.push_back(wasm::ValType::I64);
 689     Rets.push_back(wasm::ValType::I64);
 690 #else
 691     Params.push_back(iPTR);
 692 #endif
 693     Params.push_back(wasm::ValType::I64);
 694     Params.push_back(wasm::ValType::I64);
 695     break;
 696   case i64_i64_func_i64_i64_i64_i64:
 697 #if 0 // TODO: Enable this when wasm gets multiple-return-value support.
 698     Rets.push_back(wasm::ValType::I64);
 699     Rets.push_back(wasm::ValType::I64);
 700 #else
 701     Params.push_back(iPTR);
 702 #endif
 703     Params.push_back(wasm::ValType::I64);
 704     Params.push_back(wasm::ValType::I64);
 705     Params.push_back(wasm::ValType::I64);
 706     Params.push_back(wasm::ValType::I64);
 707     break;
 708   case i64_i64_func_i64_i64_i64_i64_iPTR:
 709 #if 0 // TODO: Enable this when wasm gets multiple-return-value support.
 710     Rets.push_back(wasm::ValType::I64);
 711     Rets.push_back(wasm::ValType::I64);
 712 #else
 713     Params.push_back(iPTR);
 714 #endif
 715     Params.push_back(wasm::ValType::I64);
 716     Params.push_back(wasm::ValType::I64);
 717     Params.push_back(wasm::ValType::I64);
 718     Params.push_back(wasm::ValType::I64);
 719     Params.push_back(iPTR);
 720     break;
 721   case i64_i64_i64_i64_func_i64_i64_i64_i64:
 722 #if 0 // TODO: Enable this when wasm gets multiple-return-value support.
 723     Rets.push_back(wasm::ValType::I64);
 724     Rets.push_back(wasm::ValType::I64);
 725     Rets.push_back(wasm::ValType::I64);
 726     Rets.push_back(wasm::ValType::I64);
 727 #else
 728     Params.push_back(iPTR);
 729 #endif
 730     Params.push_back(wasm::ValType::I64);
 731     Params.push_back(wasm::ValType::I64);
 732     Params.push_back(wasm::ValType::I64);
 733     Params.push_back(wasm::ValType::I64);
 734     break;
 735   case i64_i64_func_i64_i64_i32:
 736 #if 0 // TODO: Enable this when wasm gets multiple-return-value support.
 737     Rets.push_back(wasm::ValType::I64);
 738     Rets.push_back(wasm::ValType::I64);
 739     Rets.push_back(wasm::ValType::I64);
 740     Rets.push_back(wasm::ValType::I64);
 741 #else
 742     Params.push_back(iPTR);
 743 #endif
 744     Params.push_back(wasm::ValType::I64);
 745     Params.push_back(wasm::ValType::I64);
 746     Params.push_back(wasm::ValType::I32);
 747     break;
 748   case iPTR_func_iPTR_i32_iPTR:
 749     Rets.push_back(iPTR);
 750     Params.push_back(iPTR);
 751     Params.push_back(wasm::ValType::I32);
 752     Params.push_back(iPTR);
 753     break;
 754   case iPTR_func_iPTR_iPTR_iPTR:
 755     Rets.push_back(iPTR);
 756     Params.push_back(iPTR);
 757     Params.push_back(iPTR);
 758     Params.push_back(iPTR);
 759     break;
 760   case f32_func_f32_f32_f32:
 761     Rets.push_back(wasm::ValType::F32);
 762     Params.push_back(wasm::ValType::F32);
 763     Params.push_back(wasm::ValType::F32);
 764     Params.push_back(wasm::ValType::F32);
 765     break;
 766   case f64_func_f64_f64_f64:
 767     Rets.push_back(wasm::ValType::F64);
 768     Params.push_back(wasm::ValType::F64);
 769     Params.push_back(wasm::ValType::F64);
 770     Params.push_back(wasm::ValType::F64);
 771     break;
 772   case func_i64_i64_iPTR_iPTR:
 773     Params.push_back(wasm::ValType::I64);
 774     Params.push_back(wasm::ValType::I64);
 775     Params.push_back(iPTR);
 776     Params.push_back(iPTR);
 777     break;
 778   case func_iPTR_f32:
 779     Params.push_back(iPTR);
 780     Params.push_back(wasm::ValType::F32);
 781     break;
 782   case func_iPTR_f64:
 783     Params.push_back(iPTR);
 784     Params.push_back(wasm::ValType::F64);
 785     break;
 786   case func_iPTR_i32:
 787     Params.push_back(iPTR);
 788     Params.push_back(wasm::ValType::I32);
 789     break;
 790   case func_iPTR_i64:
 791     Params.push_back(iPTR);
 792     Params.push_back(wasm::ValType::I64);
 793     break;
 794   case func_iPTR_i64_i64:
 795     Params.push_back(iPTR);
 796     Params.push_back(wasm::ValType::I64);
 797     Params.push_back(wasm::ValType::I64);
 798     break;
 799   case func_iPTR_i64_i64_i64_i64:
 800     Params.push_back(iPTR);
 801     Params.push_back(wasm::ValType::I64);
 802     Params.push_back(wasm::ValType::I64);
 803     Params.push_back(wasm::ValType::I64);
 804     Params.push_back(wasm::ValType::I64);
 805     break;
 806   case func_iPTR_i64_i64_i64_i64_i64_i64:
 807     Params.push_back(iPTR);
 808     Params.push_back(wasm::ValType::I64);
 809     Params.push_back(wasm::ValType::I64);
 810     Params.push_back(wasm::ValType::I64);
 811     Params.push_back(wasm::ValType::I64);
 812     Params.push_back(wasm::ValType::I64);
 813     Params.push_back(wasm::ValType::I64);
 814     break;
 815   case i32_func_i64_i64:
 816     Rets.push_back(wasm::ValType::I32);
 817     Params.push_back(wasm::ValType::I64);
 818     Params.push_back(wasm::ValType::I64);
 819     break;
 820   case i32_func_i64_i64_i64_i64:
 821     Rets.push_back(wasm::ValType::I32);
 822     Params.push_back(wasm::ValType::I64);
 823     Params.push_back(wasm::ValType::I64);
 824     Params.push_back(wasm::ValType::I64);
 825     Params.push_back(wasm::ValType::I64);
 826     break;
 827   case unsupported:
 828     llvm_unreachable("unsupported runtime library signature");
 829   }
 830 }
 831
 832 static ManagedStatic<StaticLibcallNameMap> LibcallNameMap;
 833 // TODO: If the RTLIB::Libcall-taking flavor of GetSignature remains unsed
 834 // other than here, just roll its logic into this version.
 835 void llvm::GetLibcallSignature(const WebAssemblySubtarget &Subtarget,
 836                                const char *Name,
 837                                SmallVectorImpl<wasm::ValType> &Rets,
 838                                SmallVectorImpl<wasm::ValType> &Params) {
 839   auto &Map = LibcallNameMap->Map;
 840   auto val = Map.find(Name);
 841   assert(val != Map.end() && "unexpected runtime library name");
 842   return GetLibcallSignature(Subtarget, val->second, Rets, Params);
 843 }