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annotate third_party/emsdk/bazel/emscripten_toolchain/wasm_cc_binary.bzl @ 179:8d17f6e6e290

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[ThirdParty] Added emsdk bazel rules that can be supported by bazel 9.0.0
author MrJuneJune <me@mrjunejune.com>
date Thu, 22 Jan 2026 21:23:17 -0800
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8d17f6e6e290 [ThirdParty] Added emsdk bazel rules that can be supported by bazel 9.0.0
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1 """wasm_cc_binary rule for compiling C++ targets to WebAssembly.
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2 """
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3
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4 def _wasm_transition_impl(settings, attr):
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5 _ignore = (settings, attr)
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6
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7 features = list(settings["//command_line_option:features"])
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8 linkopts = list(settings["//command_line_option:linkopt"])
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9
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10 if attr.threads == "emscripten":
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11 # threads enabled
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12 features.append("use_pthreads")
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13 elif attr.threads == "off":
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14 # threads disabled
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15 features.append("-use_pthreads")
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16
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17 if attr.exit_runtime == True:
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18 features.append("exit_runtime")
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19
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20 if attr.backend == "llvm":
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21 features.append("llvm_backend")
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22 elif attr.backend == "emscripten":
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23 features.append("-llvm_backend")
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24
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25 if attr.simd:
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26 features.append("wasm_simd")
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27
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28 platform = "@emsdk//:platform_wasm"
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29 if attr.standalone:
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30 platform = "@emsdk//:platform_wasi"
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31 features.append("wasm_standalone")
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32
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33 return {
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34 "//command_line_option:compiler": "emscripten",
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35 "//command_line_option:cpu": "wasm",
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36 "//command_line_option:features": features,
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37 "//command_line_option:dynamic_mode": "off",
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38 "//command_line_option:linkopt": linkopts,
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39 "//command_line_option:platforms": [platform],
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40 # This is hardcoded to an empty cc_library because the malloc library
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41 # is implicitly added by the emscripten toolchain
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42 "//command_line_option:custom_malloc": "@emsdk//emscripten_toolchain:malloc",
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43 }
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44
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45 _wasm_transition = transition(
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46 implementation = _wasm_transition_impl,
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47 inputs = [
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48 "//command_line_option:features",
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49 "//command_line_option:linkopt",
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50 ],
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51 outputs = [
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52 "//command_line_option:compiler",
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53 "//command_line_option:cpu",
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54 "//command_line_option:features",
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55 "//command_line_option:dynamic_mode",
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56 "//command_line_option:linkopt",
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57 "//command_line_option:platforms",
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58 "//command_line_option:custom_malloc",
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59 ],
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60 )
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61
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62 _ALLOW_OUTPUT_EXTNAMES = [
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63 ".js",
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64 ".wasm",
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65 ".wasm.map",
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66 ".data",
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67 ".js.symbols",
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68 ".wasm.debug.wasm",
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69 ".html",
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70 ]
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71
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72 _WASM_BINARY_COMMON_ATTRS = {
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73 "backend": attr.string(
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74 default = "_default",
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75 values = ["_default", "emscripten", "llvm"],
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76 ),
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77 "cc_target": attr.label(
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78 cfg = _wasm_transition,
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79 mandatory = True,
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80 ),
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81 "exit_runtime": attr.bool(
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82 default = False,
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83 ),
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84 "threads": attr.string(
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85 default = "_default",
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86 values = ["_default", "emscripten", "off"],
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87 ),
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88 "simd": attr.bool(
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89 default = False,
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90 ),
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91 "standalone": attr.bool(
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92 default = False,
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93 ),
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94 "_allowlist_function_transition": attr.label(
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95 default = "@bazel_tools//tools/allowlists/function_transition_allowlist",
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96 ),
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97 "_wasm_binary_extractor": attr.label(
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98 executable = True,
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99 allow_files = True,
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100 cfg = "exec",
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101 default = Label("@emsdk//emscripten_toolchain:wasm_binary"),
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102 ),
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103 }
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104
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105 def _wasm_cc_binary_impl(ctx):
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106 args = ctx.actions.args()
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107 cc_target = ctx.attr.cc_target[0]
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108
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109 for output in ctx.outputs.outputs:
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110 valid_extname = False
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111 for allowed_extname in _ALLOW_OUTPUT_EXTNAMES:
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112 if output.path.endswith(allowed_extname):
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113 valid_extname = True
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114 break
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115 if not valid_extname:
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116 fail("Invalid output '{}'. Allowed extnames: {}".format(output.basename, ", ".join(_ALLOW_OUTPUT_EXTNAMES)))
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117
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118 args.add_all("--archive", ctx.files.cc_target)
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119 args.add_joined("--outputs", ctx.outputs.outputs, join_with = ",")
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120
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121 ctx.actions.run(
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122 inputs = ctx.files.cc_target,
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123 outputs = ctx.outputs.outputs,
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124 arguments = [args],
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125 executable = ctx.executable._wasm_binary_extractor,
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126 )
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127
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128 return [
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129 DefaultInfo(
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130 files = depset(ctx.outputs.outputs),
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131 # This is needed since rules like web_test usually have a data
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132 # dependency on this target.
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133 data_runfiles = ctx.runfiles(transitive_files = depset(ctx.outputs.outputs)),
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134 ),
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135 OutputGroupInfo(_wasm_tar = cc_target.files),
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136 ]
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137
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138 def _wasm_cc_binary_legacy_impl(ctx):
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139 cc_target = ctx.attr.cc_target[0]
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140 outputs = [
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141 ctx.outputs.loader,
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142 ctx.outputs.wasm,
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143 ctx.outputs.map,
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144 ctx.outputs.data,
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145 ctx.outputs.symbols,
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146 ctx.outputs.dwarf,
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147 ctx.outputs.html,
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148 ]
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149
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150 args = ctx.actions.args()
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151 args.add("--allow_empty_outputs")
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152 args.add_all("--archive", ctx.files.cc_target)
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153 args.add_joined("--outputs", outputs, join_with = ",")
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154
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155 ctx.actions.run(
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156 inputs = ctx.files.cc_target,
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157 outputs = outputs,
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158 arguments = [args],
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159 executable = ctx.executable._wasm_binary_extractor,
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160 )
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161
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162 return [
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163 DefaultInfo(
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164 executable = ctx.outputs.wasm,
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165 files = depset(outputs),
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166 # This is needed since rules like web_test usually have a data
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167 # dependency on this target.
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168 data_runfiles = ctx.runfiles(transitive_files = depset(outputs)),
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169 ),
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170 OutputGroupInfo(_wasm_tar = cc_target.files),
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171 ]
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172
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173 _wasm_cc_binary = rule(
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174 implementation = _wasm_cc_binary_impl,
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175 attrs = dict(
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176 _WASM_BINARY_COMMON_ATTRS,
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177 outputs = attr.output_list(
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178 allow_empty = False,
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179 mandatory = True,
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180 ),
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181 ),
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182 )
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183
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184 def _wasm_binary_legacy_outputs(name, cc_target):
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185 basename = cc_target.name
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186 basename = basename.split(".")[0]
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187 outputs = {
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188 "loader": "{}/{}.js".format(name, basename),
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189 "wasm": "{}/{}.wasm".format(name, basename),
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190 "map": "{}/{}.wasm.map".format(name, basename),
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191 "data": "{}/{}.data".format(name, basename),
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192 "symbols": "{}/{}.js.symbols".format(name, basename),
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193 "dwarf": "{}/{}.wasm.debug.wasm".format(name, basename),
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194 "html": "{}/{}.html".format(name, basename),
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195 }
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196
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197 return outputs
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198
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199 _wasm_cc_binary_legacy = rule(
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200 implementation = _wasm_cc_binary_legacy_impl,
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201 attrs = _WASM_BINARY_COMMON_ATTRS,
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202 outputs = _wasm_binary_legacy_outputs,
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203 )
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204
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205 # Wraps a C++ Blaze target, extracting the appropriate files.
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206 #
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207 # This rule will transition to the emscripten toolchain in order
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208 # to build the the cc_target as a WebAssembly binary.
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209 #
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210 # Args:
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211 # name: The name of the rule.
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212 # cc_target: The cc_binary or cc_library to extract files from.
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213 def wasm_cc_binary(outputs = None, **kwargs):
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214 # for backwards compatibility if no outputs are set the deprecated
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215 # implementation is used.
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216 if not outputs:
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217 _wasm_cc_binary_legacy(**kwargs)
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218 else:
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219 _wasm_cc_binary(outputs = outputs, **kwargs)