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annotate third_party/emsdk/bazel/emscripten_toolchain/link_wrapper.py @ 206:240337164a80

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[Seobeo] SSL should be used for large file as well lol.
author MrJuneJune <me@mrjunejune.com>
date Sun, 15 Feb 2026 11:41:53 -0800
parents 8d17f6e6e290
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #!/usr/bin/env python
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2 """wrapper around emcc link step.
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3
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4 This wrapper currently serves the following purposes.
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5
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6 1. When building with --config=wasm the final output is multiple files, usually
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7 at least one .js and one .wasm file. Since the cc_binary link step only
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8 allows a single output, we must tar up the outputs into a single file.
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9
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10 2. Add quotes around arguments that need them in the response file to work
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11 around a bazel quirk.
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12
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13 3. Ensure the external_debug_info section of the wasm points at the correct
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14 bazel path.
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15 """
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18 import argparse
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19 import os
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20 import subprocess
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21 import sys
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23 # Only argument should be @path/to/parameter/file
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24 assert sys.argv[1][0] == '@', sys.argv
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25 param_filename = sys.argv[1][1:]
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26 param_file_args = [line.strip() for line in open(param_filename).readlines()]
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27
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28 # Re-write response file if needed.
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29 if any(' ' in a for a in param_file_args):
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30 new_param_filename = param_filename + '.modified'
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31 with open(new_param_filename, 'w') as f:
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32 for param in param_file_args:
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33 if ' ' in param:
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34 f.write('"%s"' % param)
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35 else:
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36 f.write(param)
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37 f.write('\n')
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38 sys.argv[1] = '@' + new_param_filename
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40 emcc_py = os.path.join(os.environ['EMSCRIPTEN'], 'emcc.py')
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41 rtn = subprocess.call([sys.executable, emcc_py] + sys.argv[1:])
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42 if rtn != 0:
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43 sys.exit(1)
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44
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45 # Parse the arguments that we gave to the linker to determine what the output
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46 # file is named and what the output format is.
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47 parser = argparse.ArgumentParser(add_help=False)
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48 parser.add_argument('-o')
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49 parser.add_argument('--oformat')
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50 options = parser.parse_known_args(param_file_args)[0]
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51 output_file = options.o
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52 oformat = options.oformat
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53 outdir = os.path.normpath(os.path.dirname(output_file))
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54 base_name = os.path.basename(output_file)
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55
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56 # The output file name is the name of the build rule that was built.
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57 # Add an appropriate file extension based on --oformat.
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58 if oformat is not None:
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59 base_name_split = os.path.splitext(base_name)
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60
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61 # If the output name has no extension, give it the appropriate extension.
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62 if not base_name_split[1]:
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63 os.replace(output_file, output_file + '.' + oformat)
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64
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65 # If the output name does have an extension and it matches the output format,
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66 # change the base_name so it doesn't have an extension.
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67 elif base_name_split[1] == '.' + oformat:
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68 base_name = base_name_split[0]
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69
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70 # If the output name does have an extension and it does not match the output
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71 # format, change the base_name so it doesn't have an extension and rename
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72 # the output_file so it has the proper extension.
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73 # Note that if you do something like name your build rule "foo.js" and pass
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74 # "--oformat=html", emscripten will write to the same file for both the js and
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75 # html output, overwriting the js output entirely with the html.
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76 # Please don't do that.
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77 else:
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78 base_name = base_name_split[0]
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79 os.replace(output_file, os.path.join(outdir, base_name + '.' + oformat))
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80
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81 files = []
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82 extensions = [
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83 '.js',
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84 '.wasm',
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85 '.wasm.map',
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86 '.data',
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87 '.js.symbols',
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88 '.wasm.debug.wasm',
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89 '.html',
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90 ]
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91
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92 for ext in extensions:
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93 filename = base_name + ext
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94 if os.path.exists(os.path.join(outdir, filename)):
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95 files.append(filename)
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96
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97 wasm_base = os.path.join(outdir, base_name + '.wasm')
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98 if os.path.exists(wasm_base + '.debug.wasm') and os.path.exists(wasm_base):
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99 # If we have a .wasm.debug.wasm file and a .wasm file, we need to rewrite the
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100 # section in the .wasm file that refers to it. The path that's in there
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101 # is the blaze output path; we want it to be just the filename.
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102
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103 llvm_objcopy = os.path.join(
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104 os.environ['EM_BIN_PATH'], 'bin/llvm-objcopy')
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105 # First, check to make sure the .wasm file has the header that needs to be
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106 # rewritten.
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107 rtn = subprocess.call([
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108 llvm_objcopy,
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109 '--dump-section=external_debug_info=/dev/null',
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110 wasm_base], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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111 if rtn == 0:
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112 # If llvm-objcopy did not return an error, the external_debug_info section
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113 # must exist, so we're good to continue.
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114
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115 # Next we need to convert length of the filename to LEB128.
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116 # Start by converting the length of the filename to a bit string.
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117 bit_string = '{0:b}'.format(len(base_name + '.wasm.debug.wasm'))
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118
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119 # Pad the bit string with 0s so that its length is a multiple of 7.
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120 while len(bit_string) % 7 != 0:
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121 bit_string = '0' + bit_string
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122
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123 # Break up our bit string into chunks of 7.
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124 # We do this backwards because the final format is little-endian.
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125 final_bytes = bytearray()
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126 for i in reversed(range(0, len(bit_string), 7)):
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127 binary_part = bit_string[i:i + 7]
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128 if i != 0:
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129 # Every chunk except the last one needs to be prepended with '1'.
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130 # The length of each chunk is 7, so that one has an implicit '0'.
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131 binary_part = '1' + binary_part
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132 final_bytes.append(int(binary_part, 2))
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133 # Finally, add the actual filename.
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134 final_bytes.extend((base_name + '.wasm.debug.wasm').encode())
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135
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136 # Write our length + filename bytes to a temp file.
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137 with open(base_name + '_debugsection.tmp', 'wb+') as f:
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138 f.write(final_bytes)
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139 f.close()
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140
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141 # First delete the old section.
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142 subprocess.check_call([
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143 llvm_objcopy,
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144 wasm_base,
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145 '--remove-section=external_debug_info'])
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146 # Rewrite section with the new size and filename from the temp file.
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147 subprocess.check_call([
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148 llvm_objcopy,
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149 wasm_base,
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150 '--add-section=external_debug_info=' + base_name + '_debugsection.tmp'])
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151
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152 # Make sure we have at least one output file.
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153 if not files:
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154 print('emcc.py did not appear to output any known files!')
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155 sys.exit(1)
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156
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157 # cc_binary must output exactly one file; put all the output files in a tarball.
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158 cmd = ['tar', 'cf', base_name + '.tar'] + files
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159 subprocess.check_call(cmd, cwd=outdir)
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160 os.replace(os.path.join(outdir, base_name + '.tar'), output_file)
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161
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162 sys.exit(0)